JP7392269B2 - extruded container - Google Patents

Description

The present invention relates to a push-out container that stores a highly viscous liquid or paste-like substance such as toothpaste as a content, has a flexible container body, and is pressed to pour out the content.

Containers that store highly viscous liquids or pastes such as toothpaste, butter, mayonnaise, ketchup, and adhesives have flexible container bodies that can be pressed to pour out the contents. I have been using extruded containers. These are mainly containers made by cutting a cylindrical extruded tube and welding the head to it, or by rolling a laminated sheet and sealing the back to form a body and welding the head to it. It consists of thin-walled soft blow-molded containers and is used in many food and non-food fields.

Methods such as injection molding and compression molding are used to mold the head, and there are two known methods: one in which the head is fused to the body at the same time as molding, and the other in which the molded head is fused in a separate process. .
However, their heads are generally made of a single resin such as polyethylene, and even if the body has a structure with high barrier properties and high storage performance, oxygen etc. can permeate through the head, which increases the barrier properties. This was the reason why I couldn't do it.

Regarding this problem, for example, in Patent Document 1,
In an aluminum laminate tube container, the upper end of the body made of an aluminum laminate sheet is welded and fixed to the head part, which has a short cylindrical mouth part erected from the upper end opening of the cap-shaped shoulder part,
In the head part, an aluminum foil layer having a thickness of 20 to 60 μm and a reinforcing resin layer for increasing rigidity and regulating bending deformation are added between an outer resin layer and an inner resin layer having a thickness of 20 to 100 μm. The ring-shaped barrier sheet piece is made of an aluminum laminate sheet and forms at least the entire inner surface of the shoulder portion, and the head resin welds and fixes the barrier sheet piece. death,
The outer peripheral end of the barrier sheet piece is bent and deformed by the downward force when the head resin flows,
The outer peripheral end of the barrier sheet piece is covered with a covering resin piece of the head resin, and the thickness width of the covering resin piece is set to be larger than the end width of the outer peripheral end covered with the covering resin piece. At the same time,
An aluminum laminate tube container characterized in that the end face angle, which is the angle of the inner peripheral end face of the covering resin piece with respect to the inner surface of the barrier sheet piece, is larger than the bending deformation angle of the outer peripheral end of the barrier sheet piece. is proposed.

However, since the barrier layer in the barrier sheet piece of the head part is made of aluminum foil, and the barrier sheet piece is molded to match the shape of the head, the barrier layer may be folded or stretched, causing cracks. There was a problem that the barrier properties deteriorated.
Furthermore, although the barrier sheet piece can cover the shoulder portion of the head, it is difficult to cover the threaded portion and spout. For this reason, there is a problem in that there are parts that cannot be shielded by the barrier layer, making it impossible to completely form the barrier wall.
Additionally, due to the use of aluminum foil, there was a problem in that it was not possible to conduct post-filling inspections to check for foreign matter using metal detectors or X-ray inspection machines (X-ray transmission). .

Patent No. 5403394

Therefore, it is important to obtain an extruded container in which the barrier layer is less likely to crack or break, which allows the barrier layer to be provided up to the spout, and which can be inspected for foreign objects using a metal detector after filling. This is a subject for invention.

The extruded container of the present invention includes:
In an extruded container having a flexible body and pouring out contents by pressing, at least a barrier layer made of a film having barrier properties and a fusion bond provided on both the front and back of the barrier layer. The head has a head formed by welding a laminated film made of a laminate film folded into a pleated state to the inside of the head base material , and the head has a spouting channel inside. and a shoulder part continuous with the spout and extending in an inclined manner to the diameter of the body, and the film having barrier properties includes a film having shape retention properties and a film having a metal oxide vapor deposited layer. The head base material part is formed of a blended resin made of a resin having a fusibility and a resin having a barrier property, and the spout and the shoulder part protrude outward in a pleated shape. This is an extruded container characterized by being formed by welding a laminated film folded smoothly in a certain direction.

The extruded container of the present invention uses a film as a barrier layer, so it is difficult to break or crack, and it is possible to form a barrier wall up to the spout, so it has high barrier properties. can have
Furthermore, since no metal foil is used, it is possible to inspect for foreign substances after filling the contents through X-ray transmission.

FIG. 1 is a vertical cross-sectional view of the extruded container of the present invention in a closed state with a cap screwed together, and a partially enlarged cross-sectional view thereof. It is a process diagram showing the process of processing a laminated film into a head shape in the initial stage of the process of processing a laminated film into a head shape in the extrusion container of the present invention. FIG. 3 is a process diagram showing a process of pressing the outer folds of the laminated film processed into the inner head shape and processing it into a smooth folded state in the extrusion container of the present invention. FIG. 3 is a process diagram showing a process of inserting a laminated film processed into a head shape into an injection mold, injecting a head base material resin, and molding a head in the extrusion container of the present invention. In the extruded container of the present invention, a laminated film processed into a head shape and a body are inserted into an injection mold, and while the head base resin is injected, the extruded container integrated with the body and the laminated film is manufactured. It is a process diagram which shows the process of shaping|molding. It is a figure which shows the outflow situation of oxygen, fragrance, etc. in the vicinity of the head of the extrusion container of the present invention.

EMBODIMENT OF THE INVENTION Hereinafter, the embodiment example of the extrusion container of this invention is described in detail using figures.
FIG. 1 is a longitudinal sectional view of an extruded container 1 showing an example of the present invention, with a cap 4 screwed on.
The extruded container 1 of the present invention includes a body 2 that is thin and highly flexible, a head 3 that is fused to one end of the body 2 and has rigidity, and a head 3 that is screwed or plugged. The cap 4 is fitted with a cap 4.
In the extruded container 1, the internal pressure increases by pressing the flexible body 2, and the contents are poured out from the inside of the container, which has a high atmospheric pressure relative to the outside air, to the outside, where the atmospheric pressure is low. A balancing action takes place, allowing the contents to be poured out.

The body portion 2 is formed from a cylindrical sheet having a sealant layer 23 in at least the innermost layer. The body may be a tube extruded into a pipe shape using a profile extrusion method, or the left and right ends of a rectangular or square film may be partially overlapped to form a cylinder, and the vicinity of the joined ends are fused. It doesn't matter if it's the torso.
The body part 2 has a shoulder fusion part 21 formed at the upper end to be fused to the head part 3, and at the lower end, after filling the contents, the sealant layers 23 are put together to form a bottom seal part 22, and the extruded container is formed. It forms 1.
The body 2 used in the extruded container 1 of the present invention includes a barrier layer 24 and is formed from a flexible sheet or tube. Therefore, the contents can be poured out from the spout by removing the cap 4 and pressing the body 2 from the outside.

The head 3 is comprised of a spout 32 that fits into the cap 4 and has a spout passage 31 inside, and a shoulder 33 that slopes from the spout 32 and extends to the diameter of the body 2. .
Inside the head base material part 30 forming the head part 3, there is a laminated film consisting of at least a barrier layer 341 having barrier properties and a film fusion layer 342 that can be fused to one or both of the front and back sides of the barrier layer 341. 34 is welded in the folded state. Note that the film fusion layer 342 is preferably provided on the front and back sides of the barrier layer 341.

The barrier layer 341 used as the intermediate layer of the laminated film 34 is formed of a film having barrier properties.
Examples of films having barrier properties include films mainly made of polyamide, ethylene/vinyl alcohol copolymer, polyethylene terephthalate, and polybutylene terephthalate. Alternatively, a metal foil film with a thickness of 20 μm or less may be used.
The film used for the barrier layer may further have a vapor-deposited layer made of an inorganic oxide such as a metal on the inner or outer surface.
As inorganic oxides, metal oxides such as silicon oxide, aluminum oxide, magnesium oxide, calcium oxide, potassium oxide, tin oxide, sodium oxide, boron oxide, titanium oxide, lead oxide, zirconium oxide, and yttrium oxide can be used. . Among them, silicon oxide, aluminum oxide, magnesium oxide, etc. are preferable from the viewpoint of productivity and price.
In addition, products further laminated with Oliester (registered trademark) manufactured by Toyobo Co., Ltd., which is a biaxially stretched copolymerized polyester film with shape retention properties, cyclic polyolefin resin, cyclic polyolefin copolymer resin, or uniaxially stretched high-density polyethylene film, etc. It may be.
In particular, biaxially stretched films made of resin systems containing polybutylene terephthalate as a main component, other polyester resins, and polybutylene terephthalate copolymerized with dicarboxylic acid have high shape retention and foldability, and are free from cracks. Since this is less likely to occur, deterioration in barrier properties can be suppressed.

The film fusing layer 342 used on the front and back sides of the laminated film 34 is formed of sealant resin.
The film fusion layer 342 needs to be made of a stable resin that does not deteriorate even when it comes into contact with the contents, and also needs to be made of a material that can be fused to the head base portion 30 .
The resins used are low density polyethylene, linear low density polyethylene, medium density polyethylene, high density polyethylene, polypropylene, ethylene propylene copolymer, ethylene vinyl acetate copolymer, ionomer resin, ethylene methyl acrylate copolymer. , ethylene/acrylic acid copolymer, ethylene/ethyl acrylate copolymer, etc. can be used.

Specifically, the laminated film used in the present invention includes:
Polyethylene 20μm/silicon oxide vapor-deposited polyethylene terephthalate 12μm/polyethylene 20μm,
Polyethylene 20μm/Silicon oxide vapor deposited polyethylene terephthalate 12μm/Olyester (R) 30μm/Polyethylene 20μm,
Uniaxially stretched high-density polyethylene 23 μm/silicon oxide vapor-deposited polyethylene terephthalate 12 μm/uniaxially stretched high-density polyethylene 23 μm,
A configuration such as the following is used.

The head base material part 30 is fused to the inner surface and end face of the body part 2, and does not easily peel off even if strong stress is applied to the vicinity of the shoulder fused part 21 by pressing or the like, and has high resistance to stress cracking. Requires strong fusion strength.
Furthermore, a resin is used that can fuse the laminated film including the barrier layer on the inner surface.
Furthermore, it must fit with the cap to ensure the sealing of the container.
In other words, it is necessary to ensure the sealing strength of the cap to be screwed together at the expected opening/closing frequency due to rotation of the cap.
If the cap is a stopper type, it is necessary to ensure the strength of the stopper.

As the resin used for molding the head base material, fusible resins such as low-density polyethylene, linear low-density polyethylene, medium-density polyethylene, high-density polyethylene, polypropylene, and ethylene-propylene copolymer can be used. .

However, this head base material is located on the outside of the barrier laminated film welded in the folded state, and this barrier laminated film and body are fused together, but this head base material If the parts do not have barrier properties, as shown in FIG. 6, oxygen, water vapor, etc. will flow in, or fragrance 7, etc. will flow out, through the gaps.

Therefore, it is desirable that the head base material be formed using a blended resin that is a blend of the above-mentioned fusible resin and barrier resin.
Examples of the barrier resin include amide resins such as metaxylene diamine/adipic acid copolymer, 6-nylon, 6,6-nylon, and 6-6,6-copolymerized nylon, or the above metaxylene diamine/adipic acid copolymer. An amide resin that is a blend of an acid copolymer and at least one of 6-nylon, 6,6-nylon, and 6-6,6-copolymerized nylon, or a saponified ethylene/vinyl acetate copolymer (ethylene・vinyl alcohol copolymer), etc.
When the barrier resin is a saponified ethylene/vinyl acetate copolymer or a polyamide resin such as 6-nylon, 6,6-nylon, or 6-6,6-copolymer nylon, the compatibility is improved. It is desirable to add polyethylene modified with phthalic anhydride.
By blending the barrier resin with the fusible resin, it is possible to improve the barrier properties.

FIG. 2 is a process diagram showing the process of processing the laminated film 34 into the head shape at the initial stage of the process of processing the laminated film 34 into the head shape in the extrusion container of the present invention.
As shown in FIG. 2-1, the periphery of the laminated film 34 is sandwiched between upper and lower edges by a film fixing jig, and in this state, it is heated and softened by a far-infrared heater 5 or the like.
In this softened state, it is directly pressed against the first forming core 6 of vacuum forming, pressure forming, or vacuum forming, and the inner surface is formed into a shoulder shape by air pressure.
In FIG. 2-1, a vacuum hole 62 is provided near the boundary between the head and shoulder of the molding core 61, and this vacuum hole 62 is connected to a vacuum pump to connect the covered laminated film and the molding core 61. After removing the air from the gap between the two, the inner surface is brought into close contact with the shape of the molding core 61, and molding is performed. Of course, the molding core 61 also has a built-in cooling mechanism, which absorbs and cools the heat of the laminated film softened by heating, thereby making it possible to maintain the shape of the inner surface of the head.
At this time, the outside of the molding core 61 may be covered with a pot, and the air pressure outside the laminated film may be set to high pressure to perform pressure molding.

FIG. 2-2 is a perspective view showing a state in which the laminated film processed in the above steps is molded into the shape of the inner surface of the head.
The inner surface is in close contact with the shape of the molded core 61 and has the shape of the inner surface of the head, and the outer surface is formed with a folded laminated film.

FIG. 3 is a process diagram showing the process of pressing the outer folds of the laminated film processed into the shape of the inside of the head to form a smooth folded state.
In Figure 3-1, a laminated film whose inside is shaped into a head shape is pressed from the outside with a compression jig, with a molding core inserted inside. Compression mold the outside.
This step is preferably carried out immediately after the vacuum forming shown in FIG. 2, before the outer folds of the laminated film are cooled down, and may be carried out almost simultaneously. If the outer folds of the laminated film are cooled, it is necessary to heat the outside of the laminated film again.
Furthermore, when compressing while rotating the compression jig slowly to prevent damage to the barrier layer, the folds that first come into contact are folded in the direction of rotation, and folded uniformly in a certain direction, like folding an umbrella. be able to.
At this time, it is desirable to open the opening hole 343 at the tip of the spout, but it may be opened in an additional step.
The process of FIG. 3 and the process of FIG. 2 may be performed at the same time while applying pressure with an ultrasonic welding horn, or the shape may be processed using an impulse sealer.

FIG. 3-2 is a perspective view showing the state in which the laminated film processed in the above process is molded into a head shape with a smooth outer surface.
The outer surface is also compressed in a state where adjacent folds are bent but connected and do not easily damage the barrier layer, and the film fusion layers 342 are fused together to create a smooth outer surface. .
In particular, even at the tips and bases of folds where the barrier layer is bent, since both sides are covered with the film fusion layer, significant deterioration of the barrier layer, such as breakage, is unlikely to occur.

FIG. 4 is a process diagram showing the process of inserting the laminated film 34 processed into a head shape into the injection mold 344, injecting the head base material resin, and molding the head 3 in the extruded container of the present invention. It is.
The laminated film 34 inserted into the mold can be fused to the film fusing layer 342 of the laminated film by the heat of the molten resin injected to the outside.
The injected head base material part forms a fitting part such as a screw part that fits with the cap, and has a fusion part that can be fused to the body part 2, and is ultrasonically fused to the body part. etc., it can be integrated.

FIG. 5 shows an extrusion container of the present invention, in which the laminated film 34 processed into a head shape and the body part 2 are inserted into an injection mold, and while the head base material resin is injected, the body part 2 and the laminated film are inserted. 34 is a process diagram showing a process of molding the extruded container 1 integrated with the container 34. FIG.
The injection mold consists of a long mandrel-shaped core 3442 into which the body 2 can be inserted, and a slide cavity 3441 that is divided into left and right parts, and has a gate in the slide part. However, the gate may be the shoulder 33 or the outer surface of the spout.
The head 3 is fused to the laminated film 34 by the heat of the molten resin forming the head base 30, and the head base 30 and the laminated film 34 are fused.

Although the cap shown in the figure is a screw cap having a threaded portion, it may be a plugging type cap and a hinged cap that can be opened on the outside via a hinge.
When a plugging type cap is used, the fitting portion on the outside of the spout forms a fitting ring for plugging.

<Example 1>
The body was made of a laminated film of 12 μm silicon oxide vapor-deposited polyethylene terephthalate film, which was fused to form a cylindrical laminated tube with a diameter of 35 mm.
A film of 20 μm of polyethylene/12 μm of silicon oxide vapor-deposited polyethylene terephthalate/20 μm of polyethylene was used as the laminated film of the head.
Linear low-density polyethylene was used as the head base material, and the above laminated film was provided on the inner surface of the head to produce the extruded container shown in FIG. 1.

<Example 2>
The same laminated tube as in Example 1 was used as the laminated film for the body and head.
For the head base material, a resin made by blending linear low-density polyethylene with metaxylene diamine adipic acid copolymer was used, and the above laminated film was provided on the inner surface of the head, and the extrusion container shown in Figure 1 was made. Had made.

<Comparative example 1>
The same laminated tube as in Example 1 was used as the laminated film for the body.
No barrier laminated film was used on the head.
An extruded container was made using a linear low-density polyethylene resin as the head base material without using a laminated film.

<Comparative example 2>
The same laminated tube as in Example 1 was used as the laminated film for the body.
No barrier laminated film was used on the head.
For the head base material, a resin blended with linear low-density polyethylene and metaxylene diamine/adipic acid copolymer was used to create an extruded container without using a laminated film.

<Evaluation test method>
The bottom seal part was fused, two openings were made in the body, a tube was passed through the openings and fixed, and an oxygen permeability measuring device OX-TRAN (registered trademark) 2/22 manufactured by MOCON was used. Then, the oxygen permeability of the entire extrusion container was measured.

<Evaluation test results>
Comparative Example 1 was 0.015cc/package/day, Comparative Example 2 was 0.007cc/package/day, Example 1 was 0.005cc/package/day, and Example 2 was 0.001cc/package/ It was day.
The barrier laminated film on the inner surface of the head reduced oxygen permeation to 1/3 to 1/5, and when combined with the barrier resin blend of the head molding resin, an effect of reducing oxygen permeation to 1/15 was obtained.

The extruded container of the present invention is as described above, and since a film is used as the barrier layer, it is difficult to break or crack. Furthermore, since a barrier layer is provided not only on the shoulder portion but also on the spout side, it is possible to highly reliably block the inflow of oxygen.
Furthermore, since both sides of the barrier layer are covered with the film fusion layer, the barrier layer is unlikely to be significantly deteriorated even at the folded portion, and therefore high barrier properties can be ensured.
In particular, even higher barrier properties could be ensured by using the head base material in which a barrier resin is blended with a fusible resin.
Furthermore, since no metal foil is used, the present invention has great advantages, such as being able to inspect for foreign substances after filling with the contents through X-ray transmission.

1...Extrusion container 2...Body part 21...Shoulder fusion part 22...Bottom seal part 23... ... Sealant layer 24 ... Barrier layer 3 ... Head 30 ... Head base material portion 31 ... Pour channel 32... Outlet 33... Shoulder 34... Laminated film 341... Barrier layer 342... Film fusion layer 343... Opening hole 344... Injection mold 3441... Slide cavity 3442... Mandrel-shaped long core 4... Cap 5 ...... Far infrared heater 6 ..... First molded core 61 ..... Molded core 62 ..... Vacuum hole 7 .... ...Fragrance (permeating gas)

Claims (4)

In a push-out container that has a flexible body and pours out the contents by pressing,
A head base material is prepared by folding a laminated film consisting of at least a barrier layer made of a film having barrier properties and a film fusion layer that can be fused on both the front and back sides of the barrier layer into a pleat shape. It has a head that is welded to the inside of the part ,
The head part includes a spout having a spout channel on the inside, and a shoulder part that is continuous with the spout and slopes and widens to the diameter of the body part,
The film having barrier properties consists of a film having shape retention properties and a film having a metal oxide vapor deposited layer,
The head base material portion is formed of a blend resin consisting of a resin having fusion properties and a resin having barrier properties,
An extruded container characterized in that the spout and the shoulder portion are formed by welding the laminated film, which protrudes outward in a pleat shape, after being folded smoothly in a certain direction. 2. The extruded container according to claim 1, wherein the film having barrier properties is a film mainly composed of polyamide, ethylene/vinyl alcohol copolymer, polyethylene terephthalate, or polybutylene terephthalate. The shape-retaining film is composed mainly of a cyclic olefin resin, a cyclic olefin copolymer resin, a uniaxially stretched high-density polyethylene film, or polybutylene terephthalate, and other polyester resins or 2. The extrusion container according to claim 1 , comprising a biaxially stretched film made of a resin system containing polybutylene terephthalate copolymerized with dicarboxylic acid. The resin having barrier properties is an amide resin such as meta-xylene diamine/adipic acid copolymer, 6-nylon, 6,6 nylon, 6-6,6-copolymer nylon, or the above meta-xylene diamine/adipate copolymer. An amide resin that is a blend of adipic acid copolymer and at least one of 6-nylon, 6,6 nylon, and 6-6,6-copolymerized nylon; The extrusion container according to claim 1 , characterized in that the extrusion container is made of an alcohol copolymer).

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