JP6060503B2 - Lid material and packaging container using the lid material - Google Patents

Description

  The present invention relates to a paper-based cover material suitable for sealing and sealing at the flange portion of a container body having an opening at the upper end and a flange portion at the upper edge, and particularly instant noodles. It is related with the lid | cover material of the structure which is a lid | cover material of the packaging container which accommodates etc. and pours hot water and does not contain aluminum foil.

  Conventionally, for example, in a packaging container for storing instant noodles, instant soup, etc., the main part is a paper that seals the flange part of the container body having an opening at the upper end and a flange part at the upper peripheral edge by heat sealing or the like. As a lid material, a laminate in which an aluminum foil and a sealant layer are laminated on the lower surface of a paper layer is known. At the time of opening, if the lid material sealed to the flange portion is peeled off to the substantially central portion while lifting the tabs on the periphery, the lid material having the above-described aluminum foil intervening state remains peeled off. It has a property that can be maintained (hereinafter referred to as dead hold property).

Due to this property, for example, instant ramen can be peeled off and easily poured in half-open state, and then resealed once to warm the noodles and soften them, put the lid back on and put the tabs in the container It had a property (hereinafter referred to as resealability) that can be stopped by being wound around the flange portion of the main body. The resealability may be a property of flattening without curling when the lid is returned to its original state.

However, in the lid material having the structure in which the aluminum foil is interposed as described above, in the incineration process after use, there is a problem that the aluminum foil is entangled as an ingot in the furnace and damages the incinerator or reduces the incineration efficiency. there were. In addition, the landfill disposal of the incineration ash has problems such as generation of harmful gases due to reaction with rainwater.
Furthermore, the inclusion of aluminum foil in the lid makes it impossible to use a metal detector that inspects the inclusion of foreign matter in the container in which the contents are stored, and the inspection method using such a metal detector is not possible. It was requested to be possible.

  As a cover material for solving the above problems, for example, when a laminated material composed of a paper layer excluding aluminum foil, a sealant layer, etc. is used, the cover is easily closed without dead hold, and hot water is used. It was difficult to pour, hot water spilled and there were concerns about burns. In addition, when resealing after pouring hot water, there was a problem that the lid was not curled and closed by heat or the like, and it was difficult to reseal.

  FIG. 3 schematically shows the dead hold property of the lid. In FIG. 3 (A), the lid (41) sealed on the upper surface of the flange (42) formed at the periphery of the opening of the container body (40) is lifted upward by pulling the pull pull tab (43). The cross section of the state which opened the opening part of the left side of a figure is shown.

If the lid material has a dead hold property, the opened lid material (41) does not return to its original state even if the application of force is stopped after the lifting operation is finished, and the opening of the container body (40) Can keep the open state and can safely pour hot water inside.
Although not shown, it is also possible to stabilize the state in which the opening pull tab (43) of the lid member (41) is hooked on the flange (42) of the container main body and does not return.
Also, when the operation of re-sealing after pouring hot water is performed, the lid member does not return due to the repulsive force, and can be left in peace until a certain time required for cooking elapses.

  On the other hand, when the lid member does not have dead hold property, when the hand is released from the lid member (41) in the state of FIG. 3A, the lid member (41) is repelled from the bent state (41 ′). Thus, the original state is restored, and the opening of the container body (40) is closed as in the original state as shown in FIG. This return is further accelerated under the influence of steam generated from hot water. In this case, the operation of pouring hot water inside the container must be performed quickly with the lid held down by hand, which is a dangerous and difficult operation.

  As a solution to such a problem, Patent Document 1 describes a laminated body that does not use aluminum foil so that there is no risk of environmental problems related to waste and in order to enable inspection of products by a metal detector. Even so, a lid for an instant food container having a sufficiently opened state (dead hold property) and resealability has been proposed.

  In this proposal, the upper end opening of the container body is hermetically sealed and does not include an aluminum foil, and has a peeling tab and an opening tab on the outer peripheral edge, and both tabs are positioned approximately 90 ° from the center. In the lid for the instant food container provided in the laminate, the laminate is such that the composite sheet and the surface sheet apply an easy-release agent to a predetermined region near the width of the base of the release tab in the center. The easy-peeling layer formed by the above-mentioned easy-peeling region and an adhesive region other than the easy-peeling region are partitioned and laminated and bonded to each other, and slightly on both sides of the easy-peeling region from the boundary line between the easy-peeling region and the adhesive region of the topsheet Discloses a lid for a container for instant food, which has a perforation or a similar cut by half cut.

By using this lid material, a part of the upper layer of the lid can be peeled off and removed, and the lower layer part of the remaining lid functions as a hinge and does not return to its original state when opened and resealed. There is an effect that dead hold property can be expressed.
FIG. 4 is an explanatory diagram of the strip-like peeled portion perforation processing of the lid member. (A) shows the state before peeling of a part of the upper layer, and (B) shows the state after partial opening of the lid.

  When opening the container, first, as shown by the arrow in FIG. 4 (A) when the lid (41) is sealed from the flange of the container as viewed from above, the peeling pull tab (44) is gripped upward. lift. As a result, the upper layer portion is separated from the peeling start half cut (45), and only the inner region surrounded by the boundary line along the perforation (11) at the boundary of the peeling portion of the upper layer portion is removed in a strip shape.

  Next, the pull tab (43) for opening is grasped and lifted upward as indicated by an arrow. As a result, the lid (41) is peeled off from the flange on the outer periphery of the container, and the container opening is partially opened. At this time, when the cover material (41) is peeled to almost the center, only the inner region surrounded by the boundary line along the perforation (11) at the boundary of the peeled portion of the upper layer portion is removed at the position where it is removed in a strip shape. To reach. When peeling is stopped at this position and the lid member is bent in the peeling progress direction, it stops in a state where the cross section is shown in FIG.

At this time, the lid member is folded in a hinge shape in the region (46) where the upper layer portion is peeled and removed, and the unsealed state is maintained. That is, in the region (46), since the upper layer portion mainly made of paper is peeled and removed, the thickness is reduced, so that the repulsive force that the folded lid member tries to return to the original flat state is generated. Reduced. Since the thickness of the peeled lid member is not reduced outside the above region, it does not bend. Further, the lid member (41) can be bent and the opening pull tab (43) can be hooked on the flange to be completely temporarily fixed.
Moreover, since the product using this lid does not have an aluminum foil, it can be cooked in a microwave oven together with hot water cooking.

In the above-mentioned lid material provided with a linear perforation that penetrates the upper layer portion of the lid material, the resistance at the time of peeling is somewhat large in order to cut while breaking between the half cuts that are intermittently put, and depending on the angle at which the lid material peels May not peel well.
There is also a method of providing a linear half cut that penetrates the upper layer portion as a boundary line, but in this method, it is manufactured at the time of a single-sheet state lid that has been punched into the outer shape of the lid before sealing to the container, There is a possibility that the lid material will be folded along the straight line on the filling line to cause a malfunction.

  In particular, when a straight cut is performed from end to end, there is a high risk that the lid will be bent on the manufacturing process of the lid material or on the production line at the time of filling. FIG. 5 shows an explanatory diagram of the bending of the lid material in a single wafer state. The figure on the left shows two straight half-cuts (10) on the lid (41), and shows the state before bending after the sheet is punched, and the figure on the right shows the straight half-cut (10 ) After being bent.

  From the above circumstances, it is a lid material that cuts the upper layer portion along the half cut that penetrates the upper layer portion from the surface of the lid, and it is easy to cut at the time of opening, has a dead hold property, and at the time of manufacturing in a single wafer state There has been a demand for a lid material that does not include an aluminum foil that does not break when the lid is filled.

JP 2002-37311 A

  The present invention solves the problems of the prior art, and the problem is that the product can be inspected by a metal detector and cooked by a microwave oven without fear of environmental problems related to waste. Therefore, even in a laminate having a structure that does not use an aluminum foil, it has a sufficiently opened state (dead hold property) and resealability, and the lid material is produced at the time of manufacturing and filling in a single wafer state. An object of the present invention is to provide a lid for an instant food container that does not break and does not cause problems.

Therefore, the inventor puts a half cut penetrating the upper layer portion from the surface of the lid and cuts the upper layer portion along the half cut, and the half portion penetrating the upper layer portion inserted as a separation line from the surface of the lid material serving as the outer surface of the container. By making the shape of the cut not a straight line but a non-linear shape such as a wavy line, it is easy to cut when opening, the cross section is not rough, and the lid material does not break when handling in a single wafer state such as filling The present invention was completed by finding that it can be used as a lid.
As described above, when the half-cut separation line is entered from the surface of the lid member, the shape of the half-cut separation line is not limited to the wavy line shape as long as the shape is non-linear, and may be a line shape including other curves or bends.

In order to solve the above problems, the invention according to claim 1 of the present invention is a laminate that does not include an aluminum foil and is sealed and sealed at the upper end opening of the container body during sheet filling. In the lid material having a peeling tab and an opening tab on the periphery, both tabs being provided at a position of approximately 90 ° from the center,
The laminate has a lower portion and an upper portion, the lead from the base of the release tab to the outer peripheral edge of the street the lid of the center, a predetermined region having a near have width to the width of the base of the release tab The easy-peeling layer formed by applying an easy-peeling agent to the easy-peeling region and the adhesive region other than the easy-peeling region are laminated and adhered to each other, which is slightly easier than the boundary line between the easy-peeling region and the adhesive region. The lid material is characterized in that a non-linear cut portion formed by continuous cuts by two parallel or line-symmetrical half cuts is formed on the upper layer portion on both sides entering the peeling region.

  The invention according to claim 2 of the present invention is such that the upper layer portion includes at least a paper layer, and the lower layer portion is laminated in the order of at least a sealant layer, a base film layer, and an adhesive thermoplastic resin layer from the inner surface side. It is a lid | cover material of Claim 1 characterized by the above-mentioned.

In the invention according to claim 3 of the present invention, a groove by a half cut is formed in a lower layer portion of a base portion of the peeling tab, and the groove formed by the half cut is a cut of the non-linear cut portion . The lid material according to claim 1 or 2, wherein

The invention according to claim 4 of the present invention, according to any one of claims 1 to width of one notch of the non-linear separating portion is characterized by a range of 1mm of 3 mm 3 It is a lid material.

The invention according to claim 5 of the present invention is characterized in that the width of the narrowest portion of the two cuts of the non-linear separation portion is 5 mm or more. It is a cover material of description.

  The invention according to claim 6 of the present invention is a packaging container using the lid material according to any one of claims 1 to 5.

Since the lid according to claim 1 or 2 of the present invention does not include an aluminum foil in its configuration, there is no risk of environmental problems related to waste, and inspection by a metal detector is possible. Furthermore, when opening, first pulling up the peeling tab on the outer peripheral edge, easy peeling along a non-linear separation part consisting of two continuous or line-symmetrical cuts on both sides of the easy peeling region. The upper layer part of the region is cut and peeled, and then the other opening tab is pulled, and the lid material is peeled off and bent to the part where the upper layer part is peeled, and the peeled part becomes the sealant layer, the base film layer Since it is only a thin film of a lower layer made of, etc., it has the property of maintaining the folded state, i.e., the dead hold property, and when re-sealing, when the folded portion is returned to its original position, paper is put on this portion. Since there is no layer, it is possible to provide a lid material that is excellent in so-called resealability that is easy to return to a flat state without curling.

Furthermore, the lid material of the present invention according to claim 1 or 2 is formed in a boundary region between an easily peelable region and an adhesive region, and has a non-linear shape composed of two continuous or line-symmetrical half cuts. By forming the cut-off part in the upper layer part, it is possible to make the cover material that does not break down when filling and has no problems as compared with the case where the cut-off part by half-cut is formed in a straight line. .

In addition, the lid material of the present invention according to claim 1 or 2 is a non-linear shape composed of two continuous or line-symmetrical half cuts formed in the boundary region between the easily peelable region and the adhesive region. By forming the cut-off portion in the upper layer portion, it is possible to provide a lid material that is easy to cut at the time of opening and does not have a rough cross section as compared with the case where the cut-off portion is formed linearly. .

Further, the lid material of the present invention according to claim 3 is a half-cut groove formed in the lower layer portion when the easy-release region before opening is peeled off, when the peeling tab is once bent and then pulled up. Since it becomes easy to cut from the non-linear separation part which consists of the continuous cut by two parallel or line symmetrical half cuts of the upper layer part intersecting with this groove, the upper layer part in the easy peeling region Can be easily and reliably peeled off.

According to the cover material of the present invention according to claim 4, it is broken at the cut easily and cuts upon opening by the width of one notch of the non-linear separating portion is in the range of 1mm to 3mm It is possible to make a cover material without any problems. The width is in one cuts, representing the amplitude of width of one notch of the non-linear separating unit such as a curve or polygonal line (P).

The lid material according to claim 5 of the present invention, without cutting position upon opening transitions to adjacent cuts by the width of the narrowest portion of the two cuts in non-linear separating portion is not less than 5mm It can be set as the lid | cover material which can be cut | disconnected stably.

  According to the packaging container of claim 6 of the present invention, it is possible to provide a packaging container that is easy to cut at the time of opening, does not have a rough cross section, has a dead hold property, and does not break when lid is broken. It became so.

  As described above, according to the lid for instant food containers of the present invention, the shape of the half cut that penetrates the upper layer portion that is inserted as a separation line from the surface of the lid that is the outer surface of the container is not a straight perforation. By making a straight half-cut, it is easy to cut at the time of opening, the cross-section is not rough, has a dead hold property, and the lid material does not break when filling, and a packaging container using the same Can be done.

It is a general-view figure when the example of the container using the lid | cover material of this invention is seen from the upper surface. (A) before peeling, (B) after peeling. It is a section schematic diagram showing an example of layer composition of a lid material of the present invention. It is explanatory drawing of the dead hold property of the conventional lid | cover material. (A) is immediately after opening, (B) is in the return state. It is explanatory drawing of the strip | belt-shaped peeling part perforation process of the conventional cover material. (A) is before peeling, (B) is after opening. It is explanatory drawing of the bending in the sheet | seat state of the conventional cover material. The left figure is before the bend, and the right figure is after the bend. It is a general-view figure when the other example of the cover material of this invention is seen from the upper surface. It is a general-view figure when the other example of the cover material of this invention is seen from the upper surface. It is explanatory drawing of the strip | belt-shaped peeling part half cut process of the cover material of this invention. (A) is before peeling, (B) is after opening.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. An example of a container using the lid material of the present invention is the opening of the container body (40) having an opening provided with a flange (42) at the periphery of the upper end, for example, as shown in FIG. The lid member (41) is a laminated body that does not contain an aluminum foil, and a peeling pull tab (44) and an opening pull tab (43) on the outer periphery thereof. These tabs (44, 43) are provided at a position approximately 90 ° from the center (Q), and one of the peeling pull tabs (44) is a peeling formed on the upper layer portion. This is for cutting the half-cut process (10) at the part boundary and slightly inside to peel off the upper layer part, and the other opening tab (43) is for peeling off the lid (41) from the flange (42) and opening it. The container body (40) has a flange (42) with a heater. Sealed with a seal or the like, in which is sealed.

  First, as shown in the front view of FIG. 1 (A), the lid member (41) of the present invention has a peeling pull tab (44) and an opening pull tab (43) on the outer peripheral edge extending in the direction of 45 ° from the center. In the center, an easy peel region (L1) composed of an easy peel layer (30) coated with an easy peel agent in a region close to the base of the peel pull tab (44) and the easy peel region (L1) ) Other than the adhesive region (L2), the upper layer portion of the surface and the lower layer portion of the inner surface are laminated and adhered to each other, and from the two boundary lines of the easily peelable region (L1) and the adhesive region (L2) Slightly easy peeling area (L1), which is engraved with a half-cut process (10) at the boundary of the non-linear peeling part penetrating the upper layer part, which is inserted as a separating line from the surface of the lid that is the outer surface of the container It is.

Further, the lid material (41) of the present invention is a laminate that does not contain an aluminum foil. As shown in FIG. 2 (A), for example, the laminate is composed of an upper layer portion (51) on the surface and a lower layer on the inner surface. part (52), the easily-peelable area (L1) and the easily-peelable area by peelable layer formed by applying a peelable adhesive in the region of the width approximate the base of the stripping pull tab (44) in the center ( The upper layer part (51) and the lower layer part (52) are partitioned and bonded to each other on both sides of the layer L1), and the upper layer part (51) is easily peeled (L1) and bonded to each other. A cut line (10) by half cut is engraved in the easily peelable region (L1) slightly from the boundary line of (L2).

In FIG. 1, the half cut processing (10) at the boundary of the peeled portion is two wavy lines arranged in parallel, but the shape and arrangement thereof are not limited to the illustrated shapes.
For example, as an example of half-cut processing (10), FIG. 6 shows an example of a triangular polygonal line in (B) and an example of a square polygonal line in (C) in addition to the two wavy lines shown in (A). .
Further, as an example of half-cut processing (10), FIG. 7D shows an example of two wavy lines arranged symmetrically with respect to a line, FIG. 7E shows an example of a triangular broken line, and FIG. Also showed an example of a square line.
Half-cutting machining of the peeling section boundary (10), the shape shown in FIG. 1 (B) to the indicated such single width (P) that is 1mm or more, the point of preventing the bending of single wafer shape Is preferable from the viewpoint.

An example of a schematic cross-sectional view showing an example of the layer structure of the lid material of the present invention is shown in FIG. FIG. 2A shows an example of a relatively simple configuration, and FIG. 2B shows an example of another case.
As shown in FIG. 2 (A), the lid material of the present invention comprises, for example, the upper layer portion (51) made of a paper layer, a sealant layer (27) having sealability from the inner surface side to the flange portion of the container, a base material A lid member (41) comprising a film layer (29) and a lower layer portion (52) laminated in order of an adhesive thermoplastic resin layer (28) for providing adhesion to the upper layer portion (51).

Moreover, as illustrated in FIG. 2B, the layer configuration of the upper layer portion (51) is the surface film (24) and the paper layer (25) from the outer surface side, and the layer configuration of the lower layer portion (52) is From the inner surface side, the sealant layer (27), the light-shielding printing layer (26) with printing ink, the base film layer (29), and the adhesive thermoplastic resin layer (28) may be used in this order.
In this case, the light-shielding print layer (26) may be provided on the outer side, that is, the upper layer portion (51) side. In the case of contents that do not require light-shielding, the light-shielding layer (26) may be omitted. Absent.

  Moreover, in the lid | cover material of this invention, as shown to FIG. 1 (A), the peeling start half cut of the depth which reaches the upper layer part from the lower layer inner surface side to the lower layer part surface of the base part of peeling pull tab (44) (45 ), And the half-cut (45) thus engraved is perpendicular to the half-cut process (10) at the boundary of the peeled portion engraved in the upper layer portion.

FIG. 8 is an explanatory view of the corrugated peeled portion half-cut processing of the lid material of the present invention. FIG. 8A shows a state before peeling a part of the upper layer, and FIG. 8B shows a state after partial opening of the lid.
When opening the container, first, as shown by the arrow in FIG. 8A, where the lid (41) is sealed from the flange of the container, the peeling pull tab (44) is grasped upward. lift. As a result, the lower layer portion is separated from the peeling start half cut (45), and only the inner region surrounded by the boundary line along the half cut processing (10) of the upper layer peeling portion boundary is removed in a wave band shape. As a result, the portion where the upper layer portion (51) of the easy peeling region is removed is only the thin lower layer portion (52).

Next, the opening pull tab (43) is gripped and lifted upward. As a result, the lid (41) is peeled off from the flange on the outer periphery of the container, and the container opening is partially opened. At this time, when the cover material (41) is peeled to substantially the center, only the inner region surrounded by the boundary line along the half-cut process (10) at the boundary of the peeled portion of the upper layer portion is removed in a wave band shape To reach. When the peeling is stopped at this position and the lid member is bent in the peeling progression direction, the lid is stopped in the state shown in FIG.

At this time, the lid member is folded in a hinge shape in the region (46) where the upper layer portion is peeled and removed in a wave band shape and maintains the opened state. Thus, since the lower layer part (52) of the part from which the upper layer part (51) of the easy peeling region is peeled and removed is composed of only a thin film, the state is excellent in the dead hold property, and thus the state of being folded is maintained. It can be held. When the opening is completed in this way, hot water or the like can be poured into the container easily and safely with the lid folded.
Since the thickness of the peeled lid member is not reduced except in the region (46) from which the upper layer portion is peeled and removed, it does not bend. It is also possible to fold the lid (41) and hook the opening pull tab on the flange to completely fix it temporarily.

In addition, when the lid of the present invention is re-sealed, if only the wavy belt-like lower layer portion in the easily peeled region is returned to the original flat state, there is no paper layer as the upper layer portion in this portion. There is no curling due to hot water, and the surface is naturally flat, and this state can be maintained.
Thus, since it is excellent in resealability, in order to warm noodles etc., it can be set as the lid | cover material which does not need the effort of putting a weight etc. on a lid | cover.

Next, an example of an embodiment of a processing method of a laminate used for the lid member of the present invention will be described.
As a component of the laminated body used for the lid | cover material (41) of this invention, as shown to FIG. 2 (A), first, the linear chain which has low-temperature adhesiveness which made easy thermal welding with a container main body (40) previously. A partially laminated portion of the lower layer portion (52) prepared by bonding the sealant (27) made of a low-density polyethylene resin to the base film (29) through a urethane adhesive is prepared.

A stretched polyester film (24) is bonded to the wound paper (25) by the dry lamination method through the urethane adhesive layer on the front side in the same process by the gravure printing method on the front and back sides, and the easy release agent on the back side. The upper layer part (51) produced by printing is laminated using an extruder by extruding a partially laminated part of the lower layer part (52) and an adhesive thermoplastic resin layer made of polyethylene resin (28). By doing so, a laminated material is produced.

  Subsequently, the laminated winding material is cut into a single sheet, and then the half-cut process (10) and the lower layer portion at the boundary of the peeling portion that penetrates the upper layer portion of the shape shown in FIGS. A peeling start half cut (45) that penetrates to the paper layer (25) is performed (there may be a half cut process in a winding form), and after the half cut is completed, a small cut and a punching process are performed. A lid member (41) is produced. (Small cutting and punching may be performed at the same time as half-cutting.)

Then, the lid material of the present invention was used by filling the lid body with a pre-molded container body (a container made of paper cup, polystyrene foam, polystyrene, polypropylene, etc.) and then sealing with a heat seal method. A filled container can be created.

The material of the lid material (41) of the present invention will be described below with reference to FIGS. First, as an upper layer part (51) which comprises the cover material (41) of this invention, what has a paper layer and at least the surface is white and has multi-color printing suitability, for example, basic weight 50g / m < ² > -120g / Both art papers of about m ² , single-sided art paper, double-sided coated paper, single-sided coated paper, etc. can be suitably used, and synthetic paper may be used in some cases.

Further, in the layer structure of the upper portion (51) may also include a surface film (24) as shown in FIG. 2 (B). The surface film (24) is provided for the purpose of protecting the paper layer (25), and a plastic film such as a stretched polyethylene terephthalate film is often used. The thickness of the surface film is determined by the relationship between necessary protective performance and processability, and is not particularly limited.

Moreover, as a sealant layer (27) which comprises the lower layer part (52) of the cover material (41) of this invention, for example, the linear low density polyethylene (LLDPE) excellent in heat-sealability, low density polyethylene (LDPE), high Polyolefin resin such as density polyethylene (HDPE), unstretched polypropylene (CPP), or ethylene / vinyl acetate copolymer (EVA), ethylene / acrylic acid copolymer (EAA), ethylene / methacrylic acid copolymer (EMAA) An ethylene copolymer resin film is preferably used, and these polyolefin resins may be mixed with an incompatible component for the polyolefin resin, such as polystyrene or polybutene. A thickness of about 20 μm to 100 μm is appropriate.
The ethylene / vinyl acetate copolymer resin, an ethylene / a hot melt adhesive comprising acrylic acid copolymer resin or the like may be provided in a coating weight ^15g / ^{m 2 ~25g} / m 2 approximately, these sealant layers (27) Sufficient sealing and peeling openability with the flange (42) of a container main body (40) can be made possible.

  Moreover, as a base film (29) which comprises the lower layer part (52) of the lid | cover material (41) of this invention, a polyethylene terephthalate (PET) film with a thickness of 6-16 micrometers, for example, biaxial with a thickness of 15-25 micrometers Relatively thin films such as stretched polyethylene (OPE) film, biaxially stretched nylon (ONy) film, and biaxially stretched polypropylene (OPP) film having a thickness of 10 to 25 μm can be mentioned. Depending on the size and contents, etc. Can be selected.

  Furthermore, examples of the adhesive thermoplastic resin layer (28) constituting the lower layer portion (52) of the lid material (41) of the present invention include, for example, heat-melted linear low density polyethylene (LLDPE) and low density polyethylene (LDPE). ) And an ethylene / methacrylic acid copolymer resin (EMAA) mixed resin or the like is extruded to a thickness of 5 μm to 20 μm to form a laminate layer.

  The light-shielding printing layer (26) provided as necessary may be carbon-containing ink. For the purpose of bonding the base film (29) and the adhesive thermoplastic resin layer (28), ethylene / meta An acrylic acid copolymer resin (EMAA) or an anchor coating agent such as urethane can be mixed, and can be obtained by applying by a gravure method or the like.

In addition, a layer such as a gas barrier layer constituting the lower layer portion (52) or the upper layer portion (51) of the lid member (41) of the present invention can be provided as necessary.
As a gas barrier layer, or a gas barrier film such as a polyvinylidene chloride film, a polyvinyl alcohol film, an ethylene vinyl alcohol copolymer film, a gas barrier nylon film, a gas barrier polyethylene terephthalate film, an aluminum oxide or a silicon oxide on a PET film, etc. From inorganic oxide vapor-deposited films deposited with inorganic oxides such as polyvinylidene chloride coatings, coatings containing water-soluble resins and inorganic layered compounds, and coatings obtained by reacting metal alkoxides or their hydrolysates with isocyanate compounds A gas barrier coating layer such as a resin layer can be used.

  Furthermore, as an easy release agent used for the easy release layer (30) constituting the lid material (41) of the present invention, for example, a nitrocellulose (nitrified cotton) resin, a urethane resin, a polyamide resin or a mixture of these resins is mainly used. And a mixture of polyethylene wax, silicon and the like in consideration of compatibility. An easy peeling layer (30) can be obtained by applying these to the easy peeling region (L1) by a gravure method or a screen method as an easy peeling agent.

<Example 1>
As shown in FIG. 2 (B), a basis weight of 10 having a pattern or the like printed on the surface as the upper layer portion (51).
Using a 4.7 g / m ² piece of art paper, on the back side, an easy release agent blended with 50 parts by weight of nitrocellulose and 50 parts by weight of polyethylene wax was applied to a strip-like easy release region (L1) having a width of 10 mm and dried. An easy release layer (30) was formed.

  On the other hand, a double-sided corona-treated polyethylene terephthalate (PET) film having a thickness of 12 μm is used as the base film (29), and an easy peel layer for polyethylene having a thickness of 45 μm is laminated on one side thereof via a urethane-based anchor coat agent. On the other side, an anchor coating agent containing urethane-based carbon and an anchor coating agent containing titanium oxide sandwiching it as a light-shielding printing layer (26) are applied and dried, and this light-shielding printing layer (26) surface and above A low-density polyethylene (LDPE) melted between the surface of the easily peelable layer (30) of the obtained upper layer portion (51) is extruded and laminated as an adhesive thermoplastic resin layer (28) having a thickness of 15 μm. The laminated body used for the lid | cover material of the container for seat foods was obtained.

  Subsequently, as shown in FIG. 1 (A), two wavy half-cuts (10) are applied to the upper layer part (51) on both sides in the easy peeling region (L1) of the laminate obtained above, The peeling pull tab (44) at the peripheral tip in the direction of the corrugated easy peelable region (L1) surrounded by it, and the pull pull tab (43) at the peripheral edge in the direction orthogonal to the corrugated easy peelable region (L1) Then, on the back surface of the base portion of the peeling pull tab (44), a cover material having a diameter of 96.5 mm in which the lower layer portion (52) was half-cut (45) was obtained.

  At this time, the two wavy half-cuts (10) are wavy half-cuts in which the circumference having a curvature radius of 10 mm is continuous, the spacing between the two is 5 mm at the narrowest part, and the wave height difference, that is, One width (P) was 2 mm. The position of the easy peeling region (L1) was set to be slightly on the opposite side of the opening pull tab (43) from the center of the lid.

<Comparative Example 1>
A lid member was obtained in the same manner as in Example 1 except that two straight perforations were provided instead of the two wavy half-cuts (10).

<Comparative example 2>
A lid was obtained in the same manner as in Example 1 except that two straight half-cuts were provided instead of the two wavy half-cuts (10).

The lid for the instant food container obtained above was heat-sealed and sealed to the top of the flange (42) of the paper cup (40) covered with polyethylene to prepare a test sample of the instant noodle cup.
As shown in FIGS. 4 and 8, the dead hold property (ease of pouring hot water) at the time of opening the test sample is peeled off from the flange (42) of the cup while pulling up the pull tab (43) for opening. When the upper layer portion (51) is cut and removed in the region (46) where the upper layer portion of the central easy peeling region is peeled and removed, the state is maintained as it is, and hot water can be poured easily. there were.
In addition, its resealability (ease of resealing the waiting time to warm and soften the noodles after pouring hot water) is, as shown in the above figure, in the part where the upper layer part (51) is cut and removed Since it is made of only a thin resin film, there is no curling due to heat (hot water), so when it is returned to its original flat state, it remains as it is, and so-called resealability that does not particularly require weight is excellent. It was.

Furthermore, the ease of peeling and the folding in a single wafer state were evaluated using the above test samples.
In the test sample prepared in Example 1, the ease of peeling was good without resistance, and it was good with no breakage in a single wafer state (◯).
In the test sample of the perforation specification of Comparative Example 1, the ease of peeling was slightly poor because of the joint resistance of the perforation, but it was good (Δ) because no breakage occurred in the single wafer state. In the test sample prepared in Comparative Example 2, the ease of peeling was good without resistance, but bending in a single wafer state occurred and the workability was slightly inferior (Δ).
The results are shown in Table 1.

  As described above, since the aluminum foil is not included in the configuration, there is no risk of environmental problems related to waste, and the lid material of the present invention that can be inspected by a metal detector can be opened. , Has the property of maintaining the folded state, that is, the dead hold property, and when resealed, when the folded part is returned to its original state, there is no paper layer in this part, so there is no curl and the flat state is restored. It was possible to obtain a lid material that is easily so-called resealable.

  Furthermore, compared with the case where the cut-off part by the half cut is formed in a straight line shape, the lid member can be broken so that no trouble occurs when filling. Moreover, compared with the case where the separation part by perforated cut was formed in a straight line shape, it was possible to provide a lid material that was easy to cut at the time of opening and the cross section was not rough.

  The lid material of the present invention expresses a dead hold property that does not return to the original state during partial peeling even if aluminum foil is not used as a lid that is supplied in a single sheet when filled with contents, sealed in a container, and peeled from the container when opened. It can be suitably used as a lid having a mechanism capable of ensuring easy opening and resealability.

P ... Width of one half cut Q ... Lid center L1 ... Easy peeling region L2 ... Adhesion region 10 ... Half cut processing at the peeling portion boundary 11 ... Perforation processing at the peeling portion boundary 24 ... Surface film 25 ... Paper layer 26 ... Light-shielding printed layer 27 ... Sealant layer 28 ... Adhesive thermoplastic resin layer 29 ... Base film 30 ... Easily peelable layer 40 ... Main body 41 ... Ladder 41 '... Ladder 42 ... Flange 43 ... Pull tab 44 for opening ... For peeling Pull tab 45 ... peeling start half cut 46 ... area 51 where upper layer part is peeled and removed ... upper layer part 52 ... lower layer part

Claims (6)

It is a laminated body that does not contain aluminum foil and is supplied with a single sheet at the time of filling and sealed and sealed at the upper end opening of the container body, and has a peeling tab and an opening tab on the outer periphery, both tabs being approximately from the center. In the lid provided at the 90 ° position,
The laminate has a lower portion and an upper portion, the lead from the base of the release tab to the outer peripheral edge of the street the lid of the center, a predetermined region having a near have width to the width of the base of the release tab The easy-peeling layer formed by applying an easy-peeling agent to the easy-peeling region and the adhesive region other than the easy-peeling region are laminated and adhered to each other, which is slightly easier than the boundary line between the easy-peeling region and the adhesive region. A lid material comprising a non-linear cut portion formed by continuous cuts by two parallel or line-symmetrical half cuts on upper layer portions on both sides entering a peeling region.   The said upper layer part consists of a structure containing at least a paper layer, and a lower layer part is laminated | stacked in order of the sealant layer, the base film layer, and the adhesive thermoplastic resin layer from the inner surface side at least. Lid material. A groove formed by a half cut is formed in a lower layer portion of a base portion of the peeling tab, and the groove formed by the half cut intersects with the cut line of the non-linear separation portion. Item 3. The lid material according to item 1 or 2. The width | variety in the range of 1 mm to 3 mm of the one cut | interruption of a non-linear separation part is a lid | cover material of any one of Claim 1 to 3 characterized by the above-mentioned. The lid member according to any one of claims 1 to 4, wherein the width of the narrowest portion of the two cuts of the non-linear separation portion is 5 mm or more.   The packaging container using the lid | cover material of any one of Claim 1 to 5.

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