CH635792A5 - Squeezable delivery container - Google Patents

Description

The present invention relates to a compressible dispensing container according to the preamble of claim 1.

Hand-squeeze dispensers are intended for a variety of purposes, such as dispensing cosmetics, shampoo, food, toothpaste, and the like. Such containers consist of a tubular body made of deformable material that is closed at one end and with a closable dispenser head or nozzle is provided at the other end. Extruded metal pipes have previously been used as container bodies,

but the fragility of the metal pipes after repeated use, especially aluminum pipes, and the problems that arose when applying a satisfactory inner coating to protect against corrosion and contamination of the contents, led to the use of thermoplastic, such as polyethylene, for container bodies. In the case of plastics, such as the polyethylene mentioned, permeability causes spoilage in certain products. In this connection, the taste of toothpastes should be mentioned, which is lost due to the permeability during storage. In addition, plastic containers absorb oxygen and, over a long period of time, such absorption can decompose the product in the container. To solve these problems, laminated materials were used that had a metal partition layer between inner and outer thermoplastic layers, such as polyethylene.

Although such metal and plastic alone as well as laminated compressible containers have had some success over the years, there are problems for everyone, including the above, that have made the costs undesirably high and / or the materials from which the containers are made and the products packed in it were limited. The tubular bodies of the containers with a layered structure were made from a flat layered material by forming a tube with overlapping edges and then welding. This required the compatibility of the inner and outer layers so that welding with heat was possible and these two layers had to be made of thermoplastic. This limited the choice of materials, and limited the use of the container to these materials. Even with a partition within the layering, a thin inner layer of plastic is necessary to protect the contents of the packaging from the material of the partition and /

or the heat welding of the seam of the pipe too

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enable. As already mentioned above, the inner layer has to be a thermoplastic material because it has to be weldable. Because the inner film is made as thin as possible, some permeability of the container remains. So far, the compatibility conditions have made it impossible to produce a tubular container body with materials in the layering in which the permeability was minimized because of the welding.

In the case of tubular containers with a longitudinal hem, the hem in turn creates problems for the application of information to the body. For this reason, a longitudinal hem means that the plastic film that forms the outer layer is printed beforehand or that the layer that is one of the outer layers is designed as printed paper or plastic sheet, in which case the outermost layer would have to be a transparent plastic material . Such prior printing is expensive and adds additional cost to each unit, and printing requires high precision in forming the tube to avoid warping of the printed information. The inclusion of a longitudinal weld seam in the tubular body results in an interruption in the otherwise circular circumferential surface of the tube and thus the tube cannot be printed by an inexpensive printing process, such as roll printing, after its manufacture.

For this purpose, the head or nozzle part of such a dispensing container was connected to a body in uniform plastic or in a layered structure by welding by means of heat. This, in turn, required similar head and body material properties to enable heat welding and the use of a thermoplastic material for both the head and body of the container. Therefore, the choice of materials for the head is limited, and this may limit the use of the container even further. In addition, the production of such older containers is time-consuming and expensive, particularly as a result of the heat welding between the head and the body. In this connection, it takes time to precisely adjust the heating of the plastic to the melting temperature for the connection of the materials to be produced, and then again a considerable amount of time must be provided in which the body is cooled before the body and the head out of shape or the clamping tool with which the assembly can be carried out. This limits the production output and, together with special heating, cooling and pressure supply devices, results in an undesirably high unit price for the container. Such costs cause the container to become unacceptable in certain product markets, precisely where it would otherwise be desirable and useful. In addition, heat sealing can cause a loss in the internal uniformity of the material of the body near the head, which then results in unacceptable containers or containers that break or tear open in use.

A large number of different tube heads, which are formed in two parts and are suitable for mechanical attachment to tubular bodies made of paper, metal, plastic or of layered material, have already been proposed. In general, an axial portion of the body of the tube end is inserted between the two head parts and is clamped by means of the two parts. Although such a mechanical head and body connection avoids the heat welding problems shown above, these connections have not been able to establish themselves commercially. This rejection was the result of problems like

Impossibility of obtaining an airtight connection, impossibility of preventing separation of the head and body under the pressure acting on the tube in the connection between the head and body during use, small manufacturing figures and high manufacturing costs due to the complexity of either the structure and / or in assembly. With regard to an airtight connection, it is believed that any leakage path in the connection between the head and the body is undesirable, both because the contents of the container may be squeezed out and / or contaminated by contact with incoming air. Separation of the container body and head during use of the container is obviously undesirable because it makes the container useless for the intended dispensing and product storage. Regarding assembly time, it should be noted that millions of squeezable dispensers are manufactured each year in highly competitive market areas, so production costs and the time required are very important considerations in the industry. A number of mechanically assembled dispensing heads have required a thread between the headers or an adhesive between the tube body and the headers, and these assembly steps are time consuming, limit the amount of fabrication, and result in higher production costs than would be desired.

These and other disadvantages of older compressible containers are now to be eliminated by the invention.

Accordingly, it is an object of the invention to provide a compressible container having a layered tubular body with an inner layer of plastic, which layer is less sensitive to the penetration of enclosed products than the inner layers in conventional containers.

According to the invention this is achieved with a compressible dispensing container according to the characterizing part of patent claim 1.

Embodiments of the invention are explained below with reference to the drawing. It shows:

1 is a perspective view of a compressible container with a head assembly according to the invention,

2 is a sectional view of the head of the container according to section line 2-2 in Fig. 1 on an enlarged scale,

3 shows a sectional view in an expanded representation of the head according to FIG. 2,

4 shows a sectional view of the area at the connection point between head and body with the parts according to FIG. 2 on an enlarged scale,

5 and FIG. 6 sectional views similar to FIG. 4 with stress relationships in the area of the connection according to the invention,

7 is a schematic illustration showing how head and container are assembled,

8 is a sectional view of another embodiment of a head according to the invention,

9 is a sectional view showing a layered tubular body for a compressible container according to the invention;

Fig. 10 is an elevation, partly in section, to show the tubular part of Fig. 9, in a clamped connection with a two-part head.

When we speak of the first head part below, we always mean the part with an outer wall

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abuts the inner lateral surface of the body, and when the second head part is mentioned, a part inserted into a groove in the first head part is meant.

The compressible delivery container 10 in Fig. 1 consists of a body portion 12 of deformable material and a composite head 14 at one end of the body with first and second head members 16 and 18. As is well known, such compressible containers are assembled by on one end of a tubular body is attached to the head and the other end is left open to fill in the goods to be packed therein. The discharge end of the container is still provided with a lid, which is not shown, and after the product has been filled in,

this latter end is laterally compressed and suitably sealed to form a closed end 20. For reasons to be mentioned later, the tubular body portion 12 can be made from any desired material, including metal foils, thermoplastic or thermosetting plastic sheets or extruded tubes and layered material made from these materials with or without other suitable material such as paper. Deformable material is understood to mean that it is a property by means of which the tubular body causes the content to be released in a type of pressing by hand. Accordingly, a plastic or a layered material that tends to return to its original shape after such a squeeze out is considered deformable, such as a metal foil or a layered structure in which the foil gives rigidity and permanent deformation of the tubular body leads. In the embodiment according to FIGS. 1 and 2, the body is given as a single layer made of plastic, which e.g. consists of polyethylene and with which the tubular shape is obtained either by extrusion or by forming a sheet of plastic and shaping the tube by a hem.

The first head member 16 is circular with respect to the axis A of the dispensing container perpendicular to it and, in the exemplary embodiment shown, consists of plastic, such as urea-formaldehyde. 2 and 3 clearly show, the head member 16 has a dispensing nozzle which is formed by a centrally drilled nozzle 22 as a dispensing passage 24. The socket 22 is provided on the outside with a thread 26 so that a cover can be screwed on so that the container can be closed again after it has been used. The first head member 16 also has a protective portion 28 around the neck which is directed radially outward from the neck and has an outer wall 30 which is also circular and has a diameter such that it extends into the open end of the body 12 can be inserted before assembling the head with the body. The axial outer side of the skirt 28 has a circular groove 32 coaxial with the connector 22, which has two radially opposite groove walls 34 and 36. The outer surface 28a of the skirt 28 at the inner end of the socket 22 tapers towards the outside and axially inwards with respect to the outer end of the socket 22, the inner wall 34 of the groove 32 having a greater axial length than the outer wall 36 of the groove. The groove 32 also has a radially extending groove bottom 38 and a radial, flat wall 39 standing perpendicular to the outer wall 36 of the groove, which intersects this wall and the outer wall 30 of the first head part 16. The wall 34 is provided with a radially projecting rib 40 which extends around the entire periphery of the wall.

The second head member 18 has the shape of a ring and, in the illustrated embodiment according to FIGS. 1-7 and 10, is made of plastic, such as Polyethylene. The second head member 18 has a circular second wall 42, the diameter of which corresponds to the diameter of the inner wall 34 of the groove 32 and has a height which is slightly less than the height of the groove wall 34. In addition, the ring member has a first wall 44, the lower edge 45 is rounded or beveled. The diameter of the first wall 44 is slightly less than the diameter of the outer wall 36 of the groove 32. The ring member also has a radially extending bottom 46 and a flange 48 and a radial, planar wall 50 perpendicular to the first wall 44 of the ring on. The walls 44 and 50 intersect at an edge 51 on the periphery of the ring and the wall 44 forms a radial sealing surface against the wall or sealing surface 36 of the first header 16. The top surface 48 of the ring has an inclination that of the skirt wall 28a corresponds. The second wall 42 is provided with a peripheral groove 54 which is arranged and dimensioned in such a way

that the rib 40 of the first head member 16 fits.

The walls 42, 44 and 46 of the ring member 18 form a projection which fits into the groove 32 of the head part 16. When the two head parts are assembled, the lower part of the ring wall 42 moves in the axial direction over the rib 40 on the wall 34 until the groove 54 is aligned axially with the rib. Because the rib 40 engages the groove 54, the ring is held in place. The relative axial positions of rib 40 and groove 54 on walls 34 and 42 and the radial engagement between walls 34 and 42 provide the desired distance between axially opposed walls 39 and 50 and between radially opposed walls 36 and 44 of FIG two head links. As an alternative to such engagement with the rib and groove, the diameters of the walls 34 and 42 could also be such that a fit is formed between them, so that the two head parts are kept at the desired distance from one another.

In the case of assembled head parts, the radially opposing walls or sealing surfaces 36 and 44 of the two members are a radial distance apart, which distance is a little less than the wall thickness of the material for the tubular body 12. Preferably, the walls have 39 and 50 of the two Headers a distance from each other that corresponds to the material thickness. These dimensional relationships form the clear distance between opposing walls which allows the head to be placed on the end of the tubular body 12 in such a way that an axial end portion of the body is sandwiched between the two head members 16 and 18 in an airtight manner is and is secured against separation of the tube body from the head during use. 2 shows that an axial part 12a of the tube body 12 is folded inwards and covers the radial wall 39 of the link 16 and covers the groove wall 36 as part 12b. Because the material thickness of the tubular body 12 is greater than the radial distance between opposing walls 36 and 44, it follows that the portion 12b is compressed in between in the radial direction. The sections 12a and 12b can be heated in order to facilitate their bending over and thereby eliminate the elasticity and thus to allow the plastic material to flow into the edge 51 between the walls 44 and 50 of the ring member 18 when the section 12b is subjected to radial pressure, as shown in FIG 4 clearly shows. Such heating is below the melting temperature

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rature of the plastic and is sufficient that there is a plastic flow under pressure. The axial distance between the walls 39 and 50 is such that the part 12a of the body is clamped in without the thickness being reduced, which is given by the distance between the radially opposite walls 36 and 44.

The heating of the body parts 12a and 12b, the radial compression of the part 12b and the resulting plastic flow together lead to the desired airtight seal between the container body and the head, in that the wall part 12b is enclosed intimately and sealingly between the walls 36 and 44 and by the Voids between the head areas at the edge 51 are filled. In addition, the heating removes the elasticity from the material and brings about a structural uniformity in the areas of the bends between the outer wall and the part 12a and between the parts 12a and 12b of the body material, so that the reluctance to separate the head from the body during the Use of the container is optimized and the uniformity of the material against tearing of the material at the head is also improved. Connections are better shown in FIGS. 5 and 6 in connection with FIG. 4. In FIGS. 5 and 6 the two head members and the tube body are shown which structurally correspond to the parts according to FIGS. 2-4 to simplify the following description. Accordingly, the same numbers were used for corresponding parts.

5, the two head members 16 and 18 are dimensioned such that the radially opposing walls 36 and 44 and the axially opposing walls 39 and 50 are at a distance corresponding to the thickness of the material for the tube body. The wall sections 12a and 12b could thus be clamped between corresponding, opposing walls without a noticeable reduction in the wall thickness. If the parts 12a and 12b of the body are not heated, the bending over the walls 39 and 36 of the head member 16 causes the body material to be stretched in the areas of the bend and is therefore under tensile stress, as indicated by arrows 56 in FIG. 5 is. Such bending of the body material and its stretching around the edges between the walls 30 and 39 and between the walls 39 and 36 of the head member 16 creates a cavity at the edge 51. For this purpose, such bending and stretching creates an area of weakness over each bend in the body material in a direction indicated by lines 58 and 60 which halve the angles between walls 30 and 39 and 39 and 36 of head member 16. These structural properties and relationships promote the development of a leakage path between the inside and the outside of the container, promote the separation of body and head either by tearing off the body parts 12a and 12b as a result of unsuitable clamping and /

or by tearing the body material at the bends in the direction of lines 58 and 60.

If, according to FIG. 6, the radially opposite walls 36 and 44 are dimensioned such that they are at a smaller distance from one another than the wall thickness of the body material, the problems mentioned are not eliminated. In fact, the stress in the bends is exacerbated by the combination of axial extension and radial compression on the portion 12b. In addition, such stretching and compression together result in a taper in the material in the region of the edges between the walls 36 and 39 of the head member 16, which is larger than that for the corresponding edges in the arrangement according to FIG. 5.

Therefore, the possibility in the material for tearing along the bend in the direction of line 60, which divides the angle between the walls 36 and 39, is further increased by the taper between the parts 12a and 12b and the tensile stress. It can be shown that the possibility of tearing in this construction also exists in the bend between the tube body 12 and its end part 12a in the direction of the line 58, which divides the angle between the walls 30 and 39 at the head member 16, and that in the edge 51 there is a cavity which promotes the generation of a leakage path between the inside and the outside of the container. While the portion 12b can be radially compressed and can also taper in the arrangement according to FIG. 6, there is no plastic flow of the material. Therefore, the cavities at the edge 51 are not filled together with all other cavities, which have been created, for example, by scratches in the walls 44 and 50 or by foreign particles, and accordingly facilitate leakage between the tube body and the head parts.

5 and 6, the arrangement according to FIG. 4 shows that the heating of the plastic, radial compression and plastic flow create the possibility of the desired airtight closure and the structural uniformity of the connection between the tube body and the tube head to guarantee. In this regard, the heating of the plastic, which reduces the elasticity of the plastic and causes plastic flow, prevents the generation of tensile stresses in the bends between the body parts, thereby increasing the resistance to tearing of the body material in the area of these bends and along lines 58 and 60 is optimized. In addition, the plastic flow that fills the edge 51 with plastic also allows the filling of other cavities that have arisen as a result of scratches or the like, so that the sealing property in the connection between the tube body and the tube head with regard to leakage of air or the contents of the container are optimized. Furthermore, the plastic flow when filling the edge 51 gives a maximum thickness of the material in the direction of the line 60 and this minimizes the possibility of the material tearing or breaking in this area. Filling out the edges 51 results in an increase in the retention property with respect to the tube body material, by avoiding the creation of an open area in which the end part 12b of the tube body can be moved freely if a sufficiently large radial force is exerted on the tube body Part 12a acts, and pulls the parts 12a and 12b out of the space in the tube head. For example, if a radial force acts on the portion 12a in the structure according to FIG. 6, assuming that the material does not tear along the line 60, the cavity at the edge 51 determines a space in which the portion 12b can move freely to promote such a pull out. It is noted that the filling of the edge 51, as shown in FIG. 4, forms an obstacle which opposes pulling the tube body end out of the tube head.

The thickness of the material of the tube body 12 is of course dependent on a number of factors including the use for which the dispensing container is intended and also whether the tubular body is made from a unitary or a layered sheet and the type or types of materials for the tube body, etc. Likewise, the clear width between radially opposite walls 36 and 44, between wel5

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Chen walls the portion 12b of the material of the tubular body is radially compressed, vary according to the body material and the structure of the tubular body part. A distance between the walls 36 and 44 which exerts pressure on the body material between these walls to reduce its thickness by about 25% is sufficient to achieve the desired clamping connection and seal between the head and the tube body.

The manner in which the head members 16 and 18 are assembled with the tube body 12 according to FIG. 4 is shown schematically in FIG. 7. For this purpose there is a core 62 which is supported in a suitable manner and can rotate about its axis. The core has a support flange 64 at one end and a smaller diameter pin 66 extends axially from the outer end and forms an end surface 68 with the body of the core. The pin 66 has a diameter which corresponds to the discharge passage 24 in the head member 16 and the head member is first plugged onto and carried with this pin 66, the inner end of the head member then resting on the surface 68. The tube body 12 of the container is then pushed onto the core and struck against the flange 64 and has a certain axial length so that its end at the head member 16 extends over the wall 39 of the head member, the length of which is sufficient to match the portions 12a and 12b to form. With these components so arranged on the core, the latter is rotated and a heated tool 70 is moved radially inwards against the core in order to heat and overlap the overlapping portion of the tube body 12 until it reaches the position shown in broken lines in FIG. 7 occupies. The mold 70 may be made of nylon, for example, and is heated to remove the elasticity of the plastic and to facilitate bending and plastic flow thereof. Then, after the body material is bent over in this manner, the core is stopped and the head member 18 is axially placed on the head member 16 to move the above material into the groove 32 in the head member 16. During the advancement of the head member 18 to the head member 16, the walls 44 and 46 of the ring and the rounded or beveled edge 45 in between move the radially inward overhanging portion 12b of the body material in the axial direction into the groove 32 and radially outwards against the wall 36, to effect the plastic flow of the material. Preferably, a pressure element 72 is used to insert the ring 18 into the groove 32 and the assembly is complete when the rib 40 and the groove 54 engage one another. This shows that the assembly can be done quickly and cheaply. Once assembly is complete, the container can be removed from the core. For this purpose, the plastic was heated to a temperature which is below the bonding temperature of the plastic, as a result of which there is no heat welding between the body and the head and therefore no delay for cooling is required before the prepared tube is removed from the core can. In general, the lid for the assembled container is screwed on before the tube is removed from the core, whereby the container is ready for filling and closing.

8 shows another embodiment of a compressible container. The head consists of a first head member 76 and a second head member 74, both of which are made of plastic, such as polyethylene and nylon. The second head member 74 has a centrally drilled connection piece 78 which forms a discharge passage 80 and is provided with an external thread 82 in order to screw on a closure cover. The second head member 74 also has a skirt portion 84 which extends radially outward from the nozzle 78. The inside of the skirt 84 has an annular rib 86 which is arranged coaxially to the passage 80. The rib 86 each has a radial inner and outer wall 88 and 90 and a bottom 94 which extends outwards from the wall 90 of the rib 86 and cuts the other wall 88 of the rib in order to close a circular outer edge 88 on the skirt form.

The first head member 76 is a ring with a circular groove, which is arranged coaxially to the passage 80 and opens outwards in the axial direction, so that the rib 86 can be received therein. The groove has an inner wall 100 and an outer wall 102 and a bottom 104, which together form the same cross section as the rib. The groove wall 100 has a diameter that is related to the inner wall 88 of the rib 86 by. to form a space therebetween and the diameter of the groove wall 102 is larger than the diameter of the outer wall 90a of the rib. As in the embodiment according to FIGS. 1 to 4, the relationships of the diameters at the walls 90a and 102 form a radial space which is less than the wall thickness of the body. Thus, the axial portion 12b of the body 12 is compressed radially between the walls 90a and 102 and, as stated above, heated to provide plastic flow to fill the edge 90 between the walls 90a and 94 of the head 74. In this embodiment, the ring has a circular outer wall 106 with a diameter that corresponds to the inner diameter of the tube body, so that it can be inserted into the body part in the axial direction. A radial wall 108 between the groove wall 102 and the outer edge 106 lies under the skirt 94 and an axial part 12a of the tube body 12 is clamped between these opposite walls without the part 12a being significantly reduced. The seat with a space between the groove wall 100 and the rib wall 88 secures the head members against axial separation. If desired, the groove wall 100 and the rib wall 88 could be provided with a suitable locking catch to axially secure the head members 74 and 76 against separation.

From the above description it is evident that in the embodiments according to FIGS. 1-8 the interlocking connection between the container body and the head is independent with regard to compatible materials or interchangeable materials, for the purpose of an adhesive or welded connection between the tube body and the dispensing head is enabled. Although plastics are now specified in connection with the exemplary embodiments and some of such materials are also named, for example, the individual parts of the head can be produced from a broad spectrum of very different plastics, which are both thermoplastic and thermosetting plastics or metals, such as aluminum or combinations of Metals and plastic include.

9 shows a layered tube body for a preferred combination of materials for such a tube body. The body structure is particularly suitable for dispensing containers where product migration and oxygen absorption are problematic. A tube body 110 for a dispensing container consists of a partition sheet 112 made of a material that can prevent oxygen absorption, such as e.g. a metal foil, and an inner layer 114 made of a thermosetting plastic, 5

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preferably an epoxy resin, which is connected to the partition wall layer. These two layers are made as one sheet and a tube is then formed from them, with the two opposite edges overlapping, as shown in FIG. 9. This tubular arrangement is then encased in an outer layer 116 made of a suitable thermoplastic material, which material was obtained by extrusion.

The partition layer 112 optimizes protection against oxygen absorption and the inner layer optimizes protection against product penetration. In this context, it has become known that thermosetting material is less penetrable than thermoplastic material that has previously been used in such compressible containers. Thus, a tube body with a partition wall layer and a thermosetting plastic layer inside would give the desired properties regarding these problems, and the overlapping longitudinal edges of the partition wall layer and the inner layer could be connected for these two components to form the tube body. To this end, the divider sheet and inner layer could be formed into a tube before the thermosetting plastic was cured, and the overlapping edges could be compressed while the heat was used to cure the resin. However, it is preferred to enclose the divider layer and the inner layer in an outer layer 116 because the outer layer can hold the two layers in a tubular arrangement without a longitudinal connection therebetween, so that problems associated with the molding of the tubular arrangement can be avoided before curing the thermosetting plastic. In addition, the encapsulation of the partition and the inner layer allows a circular outer surface 118 for the tube body, which is free of interruptions in the circumference, which is otherwise common with longitudinal seams in the tube body. In this way, information can advantageously be provided on the tube body after it has been shaped, e.g. by roll printing, which was previously not a satisfactory solution.

In the preferred tube body construction according to FIG. 9, the partition 112 is an aluminum foil with a thickness of approximately 0.5 mm, the epoxy layer 114 has a thickness of approximately 0.1 mm. A suitable epoxy resin would be, for example, one sold by Hanna Chemical Company, Columbus, Ohio, under the product designation H-II or H-23, and the outer layer is a low strength polyethylene with a thickness of about 0.75 mm. With regard to the outer layer 116, it should also be noted that its thickness in the region of the overlap between the partition wall layer 112 and the inner layer 114 may differ from the material thickness mentioned.

With reference to the tube container structure according to FIG. 9, it should also be noted that a pre-printed plastic or paper layer can be used, even if the circular-cylindrical outer surface facilitates printing on the tube. If preprinting is desired, or if another layer is desired between the partition wall layer 112 and the outer layer 116 for other reasons, such a layer can be connected to the partition wall layer 112 before it is brought into a tube shape. For example, a film made of white pigmented polyethylene can be pre-printed to carry information for the container body and to be glued to the outer surface of the partition layer 112, in which case the outer layer 116 of soft polyethylene should be transparent so that the information can be seen . In general, such a pre-printed layer would have a thickness of about 0.5 mm.

FIG. 10 shows a layered tube body 110 in an assembled form and provided with a head according to FIGS. 2-4. In this case, an axial portion 110a of the tube body is placed radially inward on the head member 16 so that it radially covers the wall 39, and an axial portion 110b of the body material is placed radially in the head member 16 in the groove 32 so that it faces the outer wall 36 covered the groove. The portion 110b is compressed radially between the wall 36 of the groove and the outer wall 44 of the rib on the ring 18. According to what has been said above, it should be noted that the portion 110b is reduced in thickness and that the material of the outer layer 116 of the layering flows plastically into the edge 51.

In connection with the arrangement according to FIG. 10, it is found that the outer layer 116 of the layering consists of a suitable thermoplastic material, such as polyethylene, so that a plastic flow into the edge 51 is obtained due to a radial pressure on the body part 110b. In connection with the assembly method, it should be mentioned that the end portions 110a and 110b are heated so that the thermoplastic loses its elasticity and thus to facilitate the bending of the portions 110a and 110b and further to increase the plastic flow for the reasons mentioned above cause. If the layered body has a non-metallic partition wall layer as opposed to a metal foil as the partition wall layer, the heating is carried out before the head members are placed one into the other and in the manner as explained above in connection with the description of FIG. 7.

If the layered arrangement now has a partition wall layer with a metal foil, the heating for the aforementioned purpose is carried out in two steps. For this purpose, the parts 110a and 110b of the body are heated as described above while it is being held on the assembly core and then the parts are folded radially inward over the wall 39 of the head member 16 and then still axially along the wall 36 by placing the Ring 18 taken on the head member 16. Thereafter, the assembled container is heated in a known manner at the edge in the area of the connection between the body and the head by means of an induction heater, which is indicated schematically in FIG. 10 and bears the reference number 120, whereby the metal foil is first heated by the induction heater and this in turn also heats the thermoplastic layer 116. Such a second heating step brings about the desired plastic flow into the edge 51, so that the airtight seal is created, which plastic flow cannot be obtained up to an optimal value by the first heating step. In the first step, the metal foil acts as a heat sink and thus extracts heat from the thermoplastic layer. During the time it takes to bend the layer film and to assemble the two head members, this heat dissipation can lower the temperature of the plastic sufficiently to reduce the plastic flow. The second step also involves heating to a temperature below the melting temperature of the plastic. However, the temperature is sufficiently high to ensure the plastic flow under the radial pressure which acts on the portion 110b of the layer film.

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2 sheets of drawings

Claims (11)

635792 2nd PATENT CLAIMS 1. Compressible dispensing container, characterized by a tubular body (12, 110) with a wall with an inner and outer cylindrical outer surface, at least the outer layer of the wall consisting of a thermoplastic, a dispensing head (14) at one end of the body consisting of axially interlocking first head member (16, 76), which is inserted into the body (12, 110), and second head member (18, 74), which is inserted into the first head member (16, 76), of which head members each a head member (16, 74) is provided with a dispensing nozzle (22, 78), and of which first head member (16, 76) an outer wall (30, 106) rests on the inner lateral surface of the body (12, 110) and also has a radial wall (50, 108) which adjoins said outer wall (30, 106) inwards, and has a further circular wall (36, 102) which is axially spaced within the body (12, 110) from the mentioned outer wall (3rd 0, 106), said one end of the tubular body (12, 110) having first and second portions (12a, 12b), the radial and axial said radial wall (50, 108) and the further circular Covering wall (36, 102) of the first head member, and characterized in that the second head member (18, 74) has a first wall (44, 90a) and a second wall (42, 100) which are concentric to and spaced from the outer wall (30, 106) and the inner wall (36, 102) of the first head member (16, 76) are arranged and cooperate with them to form the first and second part (12a, 12b) of one end of the tubular body ( 12, 110) to enclose on all sides that the first wall (44, 90a) together with a radial wall (50, 94) of the said second head member (18, 74) forms an edge (51, 90) that is against the outer surface of the body (12, 110) and that the inner wall (36, 102) of the first head member (16, 76) and the first Wall (44, 90a) of the second head member (18, 74) have a radial distance which is less than the wall thickness of the body (12, 110), such that the wall of the body is compressed between the two walls and the material of the Fills the edge (51, 90). 2. Container according to claim 1, characterized in that the two head members (16, 18) each have a third wall (34, 42) which are provided with an interlocking groove (54) and rib (40). 3. Container according to claim 2, characterized in that the first head member (16) is provided with the dispensing nozzle (22) and has a frustoconical surface (28) around this dispensing nozzle, which surface the third wall (34) of the first head member ( 16) cuts that the second head member (18) is designed as a ring and has a frusto-conical wall (48) which, with an inner edge (52), intersects the third wall (42) of this second head member (18), that the frusto-conical Surfaces (28, 48) are coplanar when the two members are assembled and that said third walls have axial outer and inner ends and the groove (54) and rib (40) are spaced from said outer end of the third walls are. 4. Container according to claim 1, characterized in that the tubular body (110) is a layered film with a partition wall layer (112), an innermost layer (114) made of thermosetting plastic and an outermost layer (116) made of thermoplastic. 5. Container according to claim 4, characterized in that the innermost layer (114) consists of a thermosetting plastic. 6. Container according to claim 4, characterized in that the outermost layer (116) consists of thermoplastic material. 7. Container according to claim 5, characterized in that the innermost layer (114) is an epoxy resin. 8. Container according to claim 4, characterized in that the partition wall layer (112) is a metal foil. 9. Container according to claim 3, characterized in that the tubular body (110) consists of a layered film with a partition wall layer (112), an innermost layer (114) made of thermosetting plastic material and an outermost layer (116) made of thermoplastic material. 10. Container according to claim 9, characterized in that the innermost layer (114) consists of an epoxy resin. 11. A container according to claim 10, characterized in that the partition layer (112) is a metal foil.