JP2003170541A - Laminate for packaging retort food - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a laminate for packaging a retort food which has very excellent appearance, food hydienic qualities and opening nature without problem in a storage and a circulation in a cold district and in which a consumer can easily take out contents. <P>SOLUTION: The laminate for packaging the retort food comprises at least two layers brought into contact with the food and each made of a polypropylene in such a manner that the polypropylene layer brought into contact with the food contains the fine powder of a fluororesin. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a laminate for retort food packaging. More specifically, it is a laminate comprising a heat-sealable film and a base material film, which are mainly composed of propylene resin and have improved appearance, openability, and ease of taking out the contents, and are used for retort food packaging bags. The present invention relates to a retort food packaging laminate useful for manufacturing.

[0002]

2. Description of the Related Art Processed foods include canned foods, bottled foods, frozen foods, retort foods, and the like, and the demand for them has been rapidly increasing in recent years.
Among them, the retort pouch food has been widely used in general households, restaurants and the like. According to Japanese Agricultural Standards, "retort food means plastic film or metal foil,
Alternatively, a multi-layered product is formed into a bag or other shape (limited to those with airtightness and light-shielding property), which is filled with the cooked food, sealed by heat melting, and sterilized by heating under pressure. It means what you have done. "

Conventionally, a film using a laminate composed of a heat-sealable film mainly composed of propylene resin and a base film is widely used as a material for forming a retort food packaging bag (hereinafter also referred to as "retort pouch"). Are known. In addition, since the laminated film used for the retort food packaging bag is generally a thin film of 150 μm or less,
It is not rigid and generally has poor slip. Therefore, as a means for improving the slipperiness, conventionally, when laminating is performed, a dusting (spraying) step of spraying a fine powder of starch released on the surface is performed to give the slipperiness on the surface of the film. Has been done. As the fine starch powder used in the dusting step, starch particles having a particle size of about 5 to 10 μm are generally used. Not only the surface of the laminated body immediately after processing, but also the laminated body has a function of a lubricant when the laminated body comes into contact with a machine when laminating is performed. Therefore, it is very effective to solve problems caused by slippage defects such as wrinkles occurring when the laminated body is rolled up, defective cutting positions, running defects, and folding defects.

[0004]

However, in foods containing a large amount of fats and oils in their contents, particularly in the retort treatment heated at 100 to 135 ° C., an unstretched polypropylene film (hereinafter referred to as “CCP”) in a layer in contact with the foods. .) Unevenly absorbs fats and oils components and swells, which may cause problems such as fine irregularities on the surface of the retort pouch after retort, so-called citron skin, and poor appearance. Conventionally, as a technique for preventing the Yuzu skin phenomenon, there is JP-A No. 54-120085 as a technique for inhibiting the absorption of oil by increasing the density of propylene resin and increasing the crystallinity. There is a problem that the effect of preventing the phenomenon is not sufficient, the cold shock resistance of the heat-sealable film is impaired, and the drop bag strength is poor. Further, as a technique for intentionally kneading an ethylene component having a high oil absorption property, as a means for a polypropylene film to uniformly absorb oil, Japanese Patent Laid-Open No. 2000-2565 has been proposed.
Although there is a publication No. 32, the effect of suppressing citron skin is recognized, but there is a problem in that the heat seal strength after retort sterilization is extremely reduced.

However, the dusting agent used in the step of laminating films has a sanitary problem due to the inclusion of microorganisms in the particles. Further, in the bag-making machine and the filling machine, the dusting agent is ironed off at the portion where the film comes into frictional contact and is deposited around the machine. Then, the deposit of the dusting agent may be lumped and mixed in the retort food packaging bag, which is a sanitary problem.

[0006] Further, the retort food packaging bag has a problem that when the consumer ingests or uses the contents, especially viscous contents such as curry are stuck in the bag and are difficult to take out.

[0007]

In order to solve the above-mentioned problems, the inventors of the present invention have conducted extensive studies and as a result, as a result of conducting intensive research, without using a dusting agent, a fine layer of a fluororesin was used in a layer in contact with food. A retort food packaging laminate characterized by containing a powder has been found to have excellent appearance, openness, and ease of taking out contents. The present invention, at least a laminate composed of a heat-sealable film and a substrate film by a resin composition containing a propylene resin as a main component,
In the bag for food packaging formed in a bag shape so that the heat-sealable film is on the inner side, the resin composition containing the propylene resin as a main component is a layer (A) on the laminate side and a layer in contact with food ( A layered product for retort food packaging, comprising at least two layers of B), wherein the layer (B) contacting the food contains fine powder of a fluororesin. In the above, the above-mentioned fluororesin comprises a tetrafluorinated resin and / or a compound having a trifluorinated carbon structure at least at one of a side chain or a main chain terminal, and a laminate for retort food packaging. Can also be provided. The layer (B) in contact with the food is made of a resin containing a fine powder of a fluororesin at a ratio of 0.1 to 10 parts by weight with respect to 100 parts by weight of a propylene resin. A laminate for food packaging can also be provided. Further, as the heat-sealable film, there is also provided a retort food packaging laminate comprising a multi-layer film obtained by co-extruding at least two layers of a layer (A) on the laminate side and a layer (B) in contact with food. Can be provided.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be specifically described below.

FIG. 1 is a sectional view showing an example of the retort food packaging laminate of the present invention. The retort food packaging laminate 10 comprises a printed base film 1 and a heat-sealable film 3 made of an unstretched polypropylene film containing a propylene-ethylene block copolymer resin as a main component. It is laminated through two. The heat-sealable film 3 is composed of a laminated film in which a layer 31 on the laminate side and a layer 32 in contact with food containing fine powder 33 of fluororesin are laminated.

FIG. 2 is a sectional view showing an example of a laminated body for packaging retort food according to another embodiment of the present invention. The laminated body 10 is
The biaxially stretched nylon film 41 (functional film) was laminated on the printed biaxially stretched polyethylene terephthalate film (base film 1) using the adhesive 2. Further, the heat sealable film 3 used in FIG.
The biaxially stretched nylon film 41 and a biaxially stretched nylon film 41 are laminated via an adhesive agent 2.

FIG. 3 is a sectional view showing an example of a laminate for packaging a retort food according to still another embodiment of the present invention. Laminate 10
Was laminated with an aluminum foil 42 (functional film) on the printed biaxially oriented polyethylene terephthalate film (base film 1) using the adhesive 2. Further, the heat-sealing film 3 used in FIG. 1 and the aluminum foil 42 are laminated by an adhesive 2 to form a laminated film.

FIG. 4 is a sectional view showing an example of a laminate for packaging a retort food according to still another aspect of the present invention. The laminate 10 includes a printed biaxially stretched polyethylene terephthalate film (base film 1), a biaxially stretched nylon film 41, and a functional film 4 made of aluminum foil, which are laminated in this order with an adhesive 2 interposed therebetween. did. Further, the heat-sealing film 3 used in FIG. 1 and the functional film 4 are formed by a laminated film in which an adhesive 2 is laminated.

In the present invention, the base film 1 constituting the laminate for retort food packaging according to the present invention is a packaging film from the heat resistance to withstand the heat at the time of heat sealing and from the physical impact from the outside after packaging. In addition, it has impact resistance necessary to protect the contents and, in some cases, barrier properties. As a material of the base film 1, a polyethylene terephthalate film (hereinafter referred to as "PET film") is used.
Say. ), Polyester film such as polybutylene terephthalate film, polypropylene film (hereinafter also referred to as “PP film”), 6 nylon film,
A polyamide film such as a 6,6 nylon film can be preferably used. In general, those having further improved heat resistance and impact resistance by biaxial stretching are used. The thickness of the base film 1 is not particularly limited, but a thickness of 5 to 20 μm is usually used. Also,
If necessary, a metal or a metal oxide may be vapor-deposited and used on the base film 1. If necessary, the front surface and / or the back surface of the base film 1 may be printed.

As the heat-sealable film 3 constituting the laminate for retort food packaging according to the present invention, a non-stretched polypropylene film such as propylene-ethylene random copolymer, propylene-ethylene block copolymer, high density polyethylene ( Hereinafter also referred to as "CCP"). Among these, the propylene-ethylene block copolymer (hereinafter, also referred to as “BPP”) has a heat resistance of 120 to 135 ° C. of retort treatment and has a moderately low heat-sealing temperature. CCP, which is a copolymer, can be preferably used. As the CCP, a propylene-ethylene block copolymer having excellent oil resistance and high crystallinity can be preferably used. Further, as the CCP, a film formed from a resin composition in which a rubber component such as an ethylene-butene-1 copolymer is added to a propylene-ethylene block copolymer can be used, if necessary.

In the preferred embodiment of the present invention, the heat-sealable film 3 constituting the laminate for packaging a retort food according to the present invention is required to have a two-layer constitution of a layer 31 on the laminate side and a layer 32 in contact with food. And the total layer thickness is 50
A layer having a thickness of up to 100 μm and in contact with food 32
The layer thickness is preferably 2 μm or more, more preferably 2 to 10 μm. However, if the whole layer of the heat-sealable film 3 contains a powder of fluororesin,
Laminate strength becomes insufficient. Further, if the layer film thickness is more than necessary, since the fluorine-based resin is additionally used,
Economically inferior.

The layer 32 in contact with the food described above has an oil-preventing property,
And a composition of a polypropylene resin in which a fine powder containing a tetrafluorinated resin and / or a compound having a trifluorinated carbon structure at at least one of a side chain or a main chain end is kneaded for the purpose of imparting non-adhesiveness It is necessary to use a film formed from an object. The fine powder of the fluorinated resin may be a fine powder of an oligomer of a fluororesin or a fine powder of a composition formed by liquid-coating the surface of the anti-blocking agent with the fluororesin and then drying it.

The fluororesin contained in the fine powder kneaded into the layer 32 in contact with the food is oil-preventing property, non-adhesive property,
Excellent heat resistance. As the fluororesin used in the present invention, polytetrafluoroethylene (hereinafter referred to as "PTF
E)), tetrafluoroethylene / hexafluoropropylene (FEP), tetrafluoroethylene /
Those such as ethylene copolymer (ETFE) are commercially available and can be preferably used. Among them, polytetrafluoroethylene (PTF) which is a typical fluorinated resin
E) is particularly excellent in oil-preventing property, non-adhesiveness, and heat resistance, and can be particularly preferably used.

The fine powder of fluorocarbon resin kneaded into the layer 32 in contact with the food has a particle size of 1 to 15 μm, preferably 2 to 4 μm. The fine powder made of the above-mentioned fluororesin is 100 parts by weight of polypropylene,
0.1 to 10 parts by weight, more preferably 0.1 to 5 parts by weight may be contained. If the content is less than 0.1 part by weight, the suitability for citron skin is insufficient, and if it exceeds 10 parts by weight, the heat-sealing strength is insufficient, and it is economically inferior.

The anti-blocking agent added to the layer 32 in contact with the food is fine particles made of an inorganic material such as silica, talc, zeolite, diatomaceous earth, silicone resin, polystyrene resin, polymethylmethacrylate resin. It is a fine particle made of organic matter such as. When added to the film, the anti-blocking agent forms an uneven shape on the film surface to reduce the contact area, and has the action of preventing the film from sticking (blocking).

Further, not only the anti-blocking agent described above is kneaded into the layer 32 in contact with the food, but also a fatty acid amide type slip agent can be used. The slip agent may also be deposited in a thin film liquid form on the surface of the film to have a sliding effect.

In the retort food packaging laminate according to the present invention, other functional films 4 can be laminated if necessary. For example, either one or both of the oxygen barrier layer and the impact absorbing resin layer can be provided. Also, several layers of these layers can be provided. As the oxygen barrier layer, it is common to use an aluminum foil having a thickness of 5 to 9 μm, but it is also possible to use a coating of vinylidene chloride resin or a film obtained by vapor deposition of an inorganic substance such as aluminum, alumina oxide, or silicon oxide. it can. A nylon film is preferably used as the shock absorbing resin layer. The nylon film may be uniaxially stretched, biaxially stretched or unstretched, and can be suitably used. The thickness of the impact absorbing resin layer is not particularly limited, but is usually 5 to 40 μm, preferably 10 to 30 μm.

Next, the heat-sealable film 3 of the present invention
The manufacturing method of will be described.

In order to obtain the heat-sealable film 3 of the present invention, C containing CCP and a fine powder of fluororesin is used.
The two resins made of CP may be manufactured by, for example, a film molding method by coextrusion or a film lamination molding method. Specific examples of the film forming method by coextrusion include a coextrusion T-die method, a coextrusion inflation method, and a coextrusion lamination method. The film lamination forming method is more specifically a dry lamination method. Is mentioned.

Of these molding methods, the film molding method by coextrusion is preferable. Unlike the film lamination method, this coextrusion molding method does not require drying of the solvent in the adhesive used during processing, does not require a solvent drying step, and is superior in productivity to film lamination.

To the resin forming each layer of the retort food packaging laminate 10, known additives such as an antioxidant, an antistatic agent, and a coloring agent are optionally added within a range not hindering the achievement of the object of the present invention. It can be added. Urethane-based adhesives are preferably used as the adhesive for bonding the films, but other adhesives can be used as long as they are publicly known and do not impair sanitary conditions.

Next, in the present invention, a method for making a bag or box by using the retort food packaging laminate 10 will be explained. For example, in the case where the packaging container is a soft packaging bag made of a plastic film or the like, the above-mentioned method is used. Using a laminate for retort food packaging produced by a method such as
The surfaces of the layers of the flexible film facing the food are opposed to each other, and the layers are folded or overlapped, and the peripheral edge portion is further heat-sealed to provide a seal portion and a bag. Can make up the body. Thus, as the bag making method, the laminate for retort food packaging described above is bent with the surfaces of the layers of the heat-sealing film in contact with the food facing each other, or the two sheets are superposed. Further, the peripheral edge portion of the outer periphery thereof is, for example, a side seal type, a two-side seal type, a three-side seal type, a four-side seal type, an envelope sticking seal type, a palm sticking seal type ( According to the present invention, a heat seal is applied according to a heat seal type such as a pillow seal type), a pleated seal type, a flat bottom seal type, a square bottom seal type, and the like. Various forms of packaging containers can be manufactured. Others, for example,
It is also possible to manufacture self-supporting packaging bags (standing pouches) and the like, and in the present invention, a tube container and the like can be manufactured using the retort food packaging laminate described above.

In the above, as a heat seal method, for example, a bar seal, a rotary roll seal, a belt seal, an impulse seal, a high frequency seal, an ultrasonic seal is used. It can be performed by a known method such as. In the present invention, the packaging container as described above includes, for example, one-piece type, two-piece type, and other spouts,
Alternatively, an opening / closing zipper or the like can be optionally attached.

In the present invention, the retort food packaging bag produced as described above can seal and sterilize a wide range of foods. Filling the retort food packaging bag described above, examples of foods particularly suitable for sealing, curry, retort foods such as stew, seasonings such as miso, konjac, chikuwa, paste products such as kamaboko,
Smoked products such as ham and sausages, cooked foods such as meatballs and hamburgers, processed marine products, pickled vegetables, boiled foods, liquid or viscous foods and drinks such as luxury items.

In the present invention, the retort food packaging bag produced as described above is filled with food and the package is put in, for example, a retort kettle and the temperature is 200 ° C. and the pressure is 2
Even if it is subjected to severe sterilization treatment by retort treatment at 30 kg / cm ² for 30 minutes, it does not generate fine irregularities on the bag surface, has an excellent appearance, is hygienic, has excellent openability, and takes out food. It is possible to obtain easily packaged products.

[0030]

EXAMPLES The present invention will be described below with reference to examples.

Example 1 The polypropylene resin shown in Table 1 and polytetrafluoroethylene wax having a particle size of 2 μm were added at the ratio shown in Table 1 and the extruder (diameter 150 mm) was used.
Φ, 75 mmΦ), and temperature at T die is 250 ° C.
Then, the resin of the layer (A) on the laminate side in Table 1 is
50mmΦ, 75mmΦ resin of the layer (B) in contact with food
Then, melt coextrusion was performed from the T die so that the layer ratio shown in Table 1 was obtained, and the thickness of the heat sealable film 3 was 70 μm.
m CPP was obtained.

On a 12 μm thick biaxially stretched PET film (base film 1), four urethane-based printing inks (black ink, black ink,
Gravure printing is performed using red, indigo, and yellow), and the two-component curing type urethane adhesive 2 is applied to the printed pattern layer side so that the application amount is 3.5 g / m ² and the thickness is 7 μm. The aluminum foil (functional film 4) was sequentially dry laminated. Further, the CPP having a thickness of 70 μm obtained above
A film (heat-sealable film 3) is laminated by dry lamination to form a PET film / gravure printing layer /
A laminate 10 composed of an adhesive layer / aluminum foil / adhesive layer / heat-sealable film was obtained. In addition, in this step, the treatment with the dusting agent that is performed in the normal step was not performed.

The types of resins used in the examples of the present invention are shown below. Aluminum foil: JIS 1N30 (Nippon Foil Co., Ltd.)
PET film: Trade name "Lumirror P60" (manufactured by Toray Industries, Inc.) Urethane adhesive: Trade name "A515 / A50" (manufactured by Mitsui Takeda Chemicals, Inc.)

(Comparative Example 1) Biaxially stretched P having a thickness of 12 μm
Gravure printing was performed on the ET film (base film 1) using four colors of urethane-based printing inks (black, red, indigo, and yellow), and a two-component curing type urethane adhesive 2 was applied to the printed pattern layer side. The coating amount was 3.5 g / m ^2, and an aluminum foil (functional film 4) having a thickness of 7 μm was sequentially dry laminated. Furthermore, a CP having a thickness of 70 μm, which is composed of the ethylene-propylene block copolymer shown in Table 1,
A P film (heat sealable film 3) was laminated by dry lamination to obtain a laminate 10 composed of PET film / gravure printing layer / adhesive layer / aluminum foil / adhesive layer / heat sealable film. In addition, in this step, the treatment with the dusting agent that is performed in the normal step was not performed. Also, in the process of producing polypropylene resin, polytetrafluoroethylene wax is
Not added.

Comparative Example 2 The polypropylene resin of Table 1 and polytetrafluoroethylene wax having a particle size of 2 μm were added in the proportions shown in Table 1, and as in Example 1, a heat-sealing film having a thickness of 70 μm was added. Was obtained.

On a 12 μm thick biaxially stretched PET film (base film 1), four urethane-based printing inks (black,
Gravure printing is performed using red, indigo, and yellow), and 3.5 g of two-component curing type urethane adhesive 2 is applied to the printed pattern layer side.
/ M ² and the aluminum foil (functional film 4) having a thickness of 7 μm was sequentially dry-laminated. Furthermore, the CPP film (heat-sealable film 3) having a thickness of 70 μm obtained above is laminated by dry lamination to form a PET film / gravure printing layer / adhesive layer / aluminum foil / adhesive layer / heat-sealable film. A laminated body 10 was obtained. In addition, in this step, the treatment with the dusting agent that is performed in the normal step was not performed.

[0037]

[Table 1]

(Experiment 1: Yuzu skin suitability test) The laminated body 10 obtained in Example 1 and Comparative Examples 1 and 2 was subjected to 130 mm ×
Two pieces are cut into a size of 170 mm, CPPs are arranged so as to face each other, and thermocompression bonding is performed with a width of 2 mm on one side and a width of 10 mm on a side of 10 mm (conditions 200 ° C., 2 kg / cm ² , 0.5 seconds), and food. A laminated bag for packaging was obtained. Next, 150 g of curry was filled, and retort sterilization was performed at 120 ° C. for 30 minutes.

After the retort sterilization and cooling, the laminated body 1
The state of occurrence of citron skin on the surface of No. 0 was visually observed, and the following criteria were set, and evaluation was made in two grades, good and bad. The results are shown in Table 2.
Shown in. Good: Yuzu skin was not observed at all, and the surface condition was poor. ・ ・ ・ Yuzu skin was observed on the entire surface and the surface condition was poor.

(Experiment 2: Ease of Taking Out Contents) The laminated body 10 obtained in Example 1 and Comparative Examples 1 and 2 was used as 130
Cut two pieces into a size of 170 mm x 170 mm, place CPP so as to face each other, and perform thermocompression bonding with a width of 2 mm on one side and a width of 1 mm on a side of 10 mm (conditions 200 ° C, 2 kg / cm ² , 0.5 seconds).
Then, a notch was put in the sealed portion to obtain a food packaging bag. Here, the notch is a cut end. Next, 150 g of curry was filled, and the opening side was subjected to thermocompression bonding (condition 200 ° C.,
2 kg / cm ² , 0.5 seconds), and retort sterilization was performed at 120 ° C. for 30 minutes.

After carrying out retort sterilization, both ends of the notch were held by both hands, and were torn while pulling back and forth, and the contents were taken out from the food packaging bag with the cut surface facing down.
The easiness of taking out the contents from the food packaging bag was evaluated on the basis of the following criteria by setting two criteria: good and bad. The results are shown in Table 2.
Shown in. Good: Content does not adhere to the inner surface of the food packaging bag (no residue) Poor: Content adheres to the inner surface of the food packaging bag (with residue)

(Experiment 3: Heat Seal Strength Test) The laminated bodies obtained in Example 1 and Comparative Examples 1 and 2 were used to measure 130 mm.
Two pieces are cut into a size of 170 mm, and the CPPs are arranged so as to face each other, and thermocompression bonded (condition 200 ° C., 2 kg / cm ² , 0.5 second) with a width of 2 mm and a width of 10 mm. A laminated bag for food packaging was obtained. Next, 150 g of curry was filled, and retort sterilization was performed at 120 ° C. for 30 minutes.

After the retort sterilization was performed, the heat sealing strengths in the MD and TD directions were measured. Here, the MD direction is the film feeding direction when a resin composition containing a propylene-ethylene block copolymer as a main component is extruded and molded. The TD direction is a direction perpendicular to the MD direction. The heat-sealing strength in the MD direction is measured by cutting out a test piece including a heat-sealing portion on the vertical side of the retort food packaging bag with a width of 15 mm and pulling the test piece in parallel with the MD direction. The heat-sealing strength in the TD direction is measured by cutting out a test piece including a heat-sealing portion on the lateral side with a width of 15 mm and pulling the test piece in parallel with the TD direction. Therefore, length 1
The seal strength is measured when a seal portion having a width of 0 mm and a width of 15 mm is pulled along the length direction.

The heat seal strength was measured by using a tensile tester (manufactured by Orientec Co.) at a tensile speed of 300 mm / min. The results are shown in Table 2. In Table 2, 15
Heat seal strength per mm (Unit: g / 15mm)
Was described.

(Experiment 4: Opening property test) The laminated body 10 obtained in Example 1 and Comparative Examples 1 and 2 was 130 mm × 17.
Cut two pieces into a size of 0 mm, arrange CPP so as to face each other, and perform thermocompression bonding (condition 200 ° C, 2 kg / cm ² , 0.5 seconds) with a width of 2 mm and a width of 10 mm, and retort. A bag for food packaging was obtained.

The openability was evaluated in two grades of good and bad according to the following criteria by opening the opening of the retort food packaging bag with a finger. The results are shown in Table 2. Good: Poor easy to open with fingers ... Sticky on the film surface, causing blocking

(Experiment 5: Dropping bag test) The laminates obtained in Example 1 and Comparative Examples 1 and 2 were used to measure 130 mm × 170 mm.
2 pieces are cut out, and the CPPs are arranged so as to face each other, and thermocompression bonding is performed with a width of 2 mm and a width of 1 mm of 10 mm (condition 20).
At 0 ° C., 2 kg / cm ² , 0.5 seconds), a retort food packaging bag was obtained. Then, fill with 150 g of curry, and
Retort sterilization was performed at 0 ° C. for 30 minutes.

After carrying out retort sterilization, it was refrigerated at 3 ° C. for one week. Place the sample after refrigeration on the concrete floor with the surface of 130 mm facing down.
After 10 consecutive vertical drops from the height of m, the presence or absence of bag breakage was confirmed. The results are shown in Table 2. In Table 2, the number of broken bags / n (n: the number of bags used in the drop bag test) is shown.

(Experimental results)

[Table 2]

As is clear from the results of Experiments 1 to 5 shown in Table 2, the bag obtained from the laminate for retort food packaging according to the present invention has a heat resistance and a cold impact resistance while maintaining a conventional product. In comparison, the retort pouch has no fine irregularities on the surface, has an excellent appearance, and has excellent openability, food hygiene, and simplicity (ease of taking out contents), which contributes to industry. Is large.

[0051]

As described above, according to the laminate for retort food packaging of the present invention, the heat-sealable film of the present invention is kneaded with the fine powder of the compound having the fluorinated carbon structure as described above. By using the heat-sealable film formed from the resin composition, the oil-adhesiveness of the surface of the layer in contact with the food is prevented. For this reason, it is possible to provide a laminated body in which the appearance defect due to the fine irregularities on the surface, which is called Yuzu skin, which occurs during heat sterilization is prevented.

Further, in the film forming process of the heat-sealable film of the present invention, since the dusting process is not performed,
A hygienic retort food packaging laminate can be provided.

Further, since the layer of the laminated body for packaging a retort food product of the present invention which comes into contact with food has a very excellent releasing property, it is possible to provide a bag for packaging a retort food product having an excellent film opening property.

Since the food-contacting layer of the laminate for retort food packaging of the present invention is non-adhesive, the consumer can smoothly take out the above-mentioned contents from the bag. It is possible to provide a retort food packaging bag.

As described above, by using the heat-sealable film of the present invention laminated on a substrate film, there is no problem in storage and distribution in cold regions, and it is resistant to citron skin, openness, and food. It is possible to provide a retort food packaging bag that is extremely hygienic and that allows the consumer to easily take out the contents.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing an example of a retort food packaging laminate of the present invention.

FIG. 2 is a cross-sectional view showing an example of a retort food packaging laminate according to another embodiment of the present invention.

FIG. 3 is a cross-sectional view showing an example of a laminate for retort food packaging according to still another aspect of the present invention.

FIG. 4 is a cross-sectional view showing an example of a laminate for retort food packaging according to still another aspect of the present invention.

[Explanation of symbols]

1 Base film 11 printing layer 2 Adhesive layer 3 Heat-sealable film 31 Layer on the laminating side 32 Layers in contact with food 33 Fine particles of fluorine resin 4 Functional film 41 Biaxially stretched nylon film 42 aluminum foil 10 Retort food packaging laminate

   ─────────────────────────────────────────────────── ─── Continued front page    F-term (reference) 3E086 AB01 AD01 BA04 BA13 BA15                       BA24 BB41 BB51 CA01                 4F100 AK01A AK07B AK07C AK17C                       AT00A BA03 BA10A CA23C                       DE01C EH20 GB23 JB07                       JD05 JL05 JL12B

Claims (4)

[Claims] 1. A food product in which a laminate composed of a heat-sealable film and a base film made of a resin composition containing at least a propylene resin as a main component is formed into a bag shape with the heat-sealable film inside. In the packaging bag, the resin composition containing propylene resin as a main component is composed of at least two layers of a laminate side layer (A) and a food contact layer (B), and a food contact layer (B).
A laminated body for retort food packaging, characterized in that it contains a fine powder of a fluororesin. 2. The fluororesin according to claim 1, wherein the fluororesin comprises a tetrafluorinated resin and / or a compound having a trifluorinated carbon structure on at least one of a side chain or a main chain terminal. Laminate for retort food packaging. 3. The food-contacting layer (B) is made of a resin containing a fine powder of a fluororesin at a ratio of 0.1 to 10 parts by weight to 100 parts by weight of a propylene resin. The laminated body for retort food packaging according to claim 1 or 2. 4. The heat-sealable film comprises a multilayer film obtained by co-extruding at least two layers of a layer (A) on the laminate side and a layer (B) in contact with food. Alternatively, the laminate for retort food packaging according to 3 above.