JP2020152383A - Extrusion container - Google Patents

Abstract

To provide an extrusion container in which a barrier layer is less likely to crack or break, the barrier layer can be provided up to a spout, and foreign matter can be inspected after filling contents.SOLUTION: An extrusion container (1) having a flexible body portion (2) and being pressed to pour out contents includes a head portion formed by welding a laminated film (34) including at least a barrier layer (341) made of a film having a barrier property, and a film fusion layer (342) capable of fusing on one or both of front and back sides thereof, in a folded state.SELECTED DRAWING: Figure 1

Description

The present invention relates to an extrusion container that stores a high-viscosity liquid or paste such as toothpaste as a content, has a flexible container body, and presses the content to be ejected.

Containers that store high-viscosity liquids or pastes such as toothpaste, butter, mayonnaise, ketchup, and adhesives as contents have a flexible container body and press to pour out the contents. Has used extruded containers. These are mainly containers in which a cylindrical extrusion tube is cut and the head is fused to it, or a laminated sheet is rolled to seal the back to form a body and the head is welded to it. It consists of thin-walled soft blow-molded containers and is used in many food and non-food fields.

As a method for molding the head, methods such as injection molding and compression molding are adopted, and a method of fusing to the body at the same time as molding and a method of fusing the molded head in a separate process are known. ..
However, their heads are generally made of a single resin such as polyethylene, and even if the body has a high barrier property and a high storage performance, oxygen and the like permeate from the head to enhance the barrier property. It was a factor that could not be done.

In response to this problem, for example, in Patent Document 1,
In an aluminum laminated tube container in which the upper end of the body made of an aluminum laminated sheet is welded and fixed to the head portion in which a short cylindrical mouth tube portion is erected from the upper end opening of the cap-shaped shoulder portion.
An aluminum foil layer having a thickness of 20 to 60 μm and a reinforcing resin layer having a thickness of 20 to 60 μm to increase rigidity and restrict bending deformation are added to the head portion between an outer surface resin layer having a thickness of 20 to 100 μm and an inner surface resin layer. It is composed of a ring-shaped barrier sheet piece made of an aluminum laminated sheet that has a laminated structure of four layers and forms at least the entire inner surface of the shoulder portion, and a head resin that welds and fixes the barrier sheet piece. And
The pushing force of the head resin when flowing causes bending and deformation of the outer peripheral end of the barrier sheet piece.
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 a width dimension larger than the end width of the outer peripheral end portion covered with the covering resin piece. At the same time
An aluminum laminated tube container characterized in that the end face angle, which is the angle of the inner peripheral end surface of the covering resin piece with respect to the inner surface of the barrier sheet piece, is set to an angle larger than the bending deformation angle of the outer peripheral end portion of the barrier sheet piece. Is proposing.

However, since the barrier layer in the barrier sheet piece of the head portion is an aluminum foil and the barrier sheet piece is formed according to the shape of the head, the barrier layer is folded or stretched, causing cracks. There was a problem that the barrier property was lowered.
Further, even if the barrier sheet piece can cover the shoulder portion inside the head, it is difficult to cover the screw portion and the spout. For this reason, there is a problem that a portion that cannot be shielded by the barrier layer is generated and the barrier wall cannot be completely formed.
In addition, by using aluminum foil, there is a problem that the content after filling cannot be inspected after filling to confirm the presence or absence of foreign matter mixed with a metal detector, an X-ray inspection machine (X-ray transmission), or the like. ..

Japanese Patent No. 5403394

Therefore, it is possible to obtain an extrusion container in which the barrier layer is less likely to crack or break, the barrier layer can be provided up to the spout, and foreign matter can be inspected by a metal detector or the like after filling the contents. It is a subject of the invention.

The extrusion container of the present invention
In an extrusion vessel that has a flexible body and presses to eject the contents.
It was formed by welding a laminated film composed of at least a barrier layer made of a film having a barrier property and a film fusion layer made of a film fusion layer capable of being fused to either one or both of the front and back surfaces in a partially folded state. An extrusion container characterized by having a head.

Since the extruded container of the present invention uses a film as a barrier layer, it is unlikely to break or crack, and a barrier wall can be formed up to the spout, thus providing a high barrier property. Can have.
Moreover, since no metal foil is used, it is possible to inspect foreign substances after filling the contents by transmitting X-rays.

It is a vertical sectional view of the extruded container of the present invention in a state where a cap is screwed and closed, and a partially enlarged sectional view thereof. It is a process drawing which shows the process of processing a laminated film into a head shape in the early stage of the process of processing a laminated film into a head shape in the extrusion container of this invention. It is a process drawing which shows the process of pressing the outer fold part of the laminated film processed into the shape of the inside of a head in the extruding container of this invention, and processing it into a smooth folded state. It is a process drawing which shows the process of inserting the laminated film processed into the head shape into the injection molding die in the extrusion container of this invention, injecting the resin of a head base material part, and molding a head. In the extrusion container of the present invention, a laminated film processed into a head shape and a body portion are inserted into an injection molding die, and an extrusion container integrated with the body portion and the laminated film is formed while injecting the resin of the head base material portion. It is a process diagram which shows the process of molding. It is a figure which shows the outflow state of oxygen, fragrance and the like in the vicinity of a head in the extruding container of this invention.

Hereinafter, embodiments of the extrusion container of the present invention will be described in detail with reference to the drawings.
FIG. 1 is a vertical cross-sectional view of an extrusion container 1 showing an example of the present invention in a state where a cap 4 is screwed.
The extrusion container 1 of the present invention has a thin-walled, highly flexible and flexible body portion 2, a head portion 3 fused to one end of the body portion 2 and having rigidity, and a head portion 3 screwed or plugged. It is composed of a cap 4 to be fitted with the cap 4.
The internal pressure of the extruded container 1 rises by pressing the flexible body portion 2, and the contents are poured out from the inside of the container having a high atmospheric pressure with respect to the outside air to the outside having a low atmospheric pressure. The balancing action works and the contents can be poured out.

The body portion 2 is formed of a tubular sheet having a sealant layer 23 at least in the innermost layer. The body may be a tube extruded into a pipe shape by a deformed extrusion molding method, or the left and right ends of a rectangular or square film are partially overlapped to form a tubular shape, and the vicinity of the combined ends is fused. It may be the torso.
The body portion 2 forms a shoulder fusion portion 21 that fuses with the head 3 at the upper end, and the lower end forms a bottom seal portion 22 by combining the sealant layers 23 after filling the contents, and extrudes the container. Forming 1.
The body 2 used in the extrusion container 1 of the present invention includes a barrier layer 24 and is formed of a flexible sheet or tube. Therefore, by removing the cap 4 and pressing the body portion 2 from the outside, the contents can be poured out from the spout.

The head portion 3 is composed of a spout 32 which is fitted with a cap 4 and has a spout flow path 31 inside, and a shoulder portion 33 which is inclined from the spout 32 and extends to the diameter of the body 2. ..
A laminated film composed of at least a barrier layer 341 having a barrier property and a film fusion layer 342 that can be fused to either or both of the front and back surfaces thereof inside the head base material portion 30 forming the head 3. 34 is welded in the folded state. The film fusion layer 342 is preferably provided on the front and back surfaces of the barrier layer 341.

The barrier layer 341 used for the intermediate layer of the laminated film 34 is formed of a film having a barrier property.
As an example of the film having a barrier property, for example, a film mainly composed of polyamide, ethylene / vinyl alcohol copolymer, polyethylene terephthalate, or polybutylene terephthalate can be used. Moreover, you may use the metal foil film of 20 μm or less.
The film used for the barrier layer may be further provided with a thin-film deposition layer made of an inorganic oxide such as a metal on the inner surface or the outer surface.
As the inorganic oxide, 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 and the like are preferable from the viewpoint of productivity and price.
Further, an oryester (registered trademark) manufactured by Toyo Boseki Co., Ltd., which is a biaxially stretched copolymer polyester film having shape retention, a cyclic polyolefin resin, a cyclic polyolefin copolymer resin, a uniaxially stretched high-density polyethylene film, or the like is further laminated. It may be.
In particular, a biaxially stretched film composed of other polyester resins containing polybutylene terephthalate as a main component and a resin containing polybutylene terephthalate copolymerized with a dicarboxylic acid has high shape retention and foldability, and cracks. Is unlikely to occur, so deterioration of the barrier property can be suppressed.

The film fusion layer 342 used on the front and back surfaces of the laminated film 34 is formed of a sealant resin.
The film fusion layer 342 needs to be a stable resin that does not deteriorate even when in contact with the contents, and is a material that can be fused to the head base material portion 30.
Resins used include 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 20 μm / Silicon oxide vapor-deposited polyethylene terephthalate 12 μm / Polyethylene 20 μm,
Polyethylene 20 μm / Silicon oxide vapor-deposited polyethylene terephthalate 12 μm / Oryester (R) 30 μm / Polyethylene 20 μm,
Uniaxially stretched high-density polyethylene 23 μm / silicon oxide-deposited polyethylene terephthalate 12 μm / uniaxially stretched high-density polyethylene 23 μm,
Etc. are used.

The head base material portion 30 is fused to the inner surface and the end surface of the body portion 2, and even if a strong stress is applied to the vicinity of the shoulder fusion portion 30 by pressing or the like, the head base material portion 30 is not easily peeled off and has high resistance to stress cracking and the like. Requires strong fusion strength.
Further, a resin capable of fusing the laminated film including the barrier layer on the inner surface is used.
Further, it is necessary to fit with the cap to ensure the tightness of the container.
That is, it is necessary to secure the sealing strength of the screwing cap at the expected number of opening and closing frequencies due to the rotation of the cap.
If it is a plug-type cap, it is necessary to ensure the plug strength.

As the resin used for molding the head base material, a cohesive resin such as low density polyethylene, linear low density polyethylene, medium density polyethylene, high density polyethylene, polypropylene, ethylene / propylene copolymer, etc. can be used. ..

However, this head base material is located on the outside of the barrier laminated film welded in a folded state, and the barrier laminated film and the body are fused. If the portion does not have a barrier property, as shown in FIG. 6, inflow of oxygen, water vapor, etc., or outflow of fragrance 7 or the like occurs through the gaps between them.

Therefore, it is desirable that the resin for molding the head base material is formed of a blended resin in which the above-mentioned fusing resin and the barrier resin are blended.
Examples of the barrier resin include amide resins such as metaxylene diamine / adipic acid copolymer, 6-nylon, 6,6-nylon, 6-6,6-copolymerized nylon, or the metaxylene diamine adipine. An amide resin blended with an acid copolymer and at least one of 6-nylon, 6,6-nylon, and 6-6,6-copolymerized nylon, or an ethylene / vinyl acetate copolymer saponified product (ethylene). -Vinyl alcohol copolymer), etc. are conceivable.
When the barrier resin is an ethylene-vinyl acetate copolymer saponified product or a polyamide-based resin such as 6-nylon, 6,6-nylon, 6-6,6-copolymerized nylon, the compatibility is improved. , It is desirable to add phthalic anhydride-modified polyethylene or the like.
By blending the barrier resin with the fusion resin, the barrier property can be improved.

FIG. 2 is a process diagram showing a step of processing the laminated film 34 into a head shape at the initial stage of the process of processing the laminated film 34 into a head shape in the extrusion container of the present invention.
As shown in FIG. 2-1 the laminated film 34 is softened by sandwiching the peripheral edge between the upper and lower edges with a film fixing jig and heating it with a far-infrared heater 5 or the like in that state.
In this softened state, it is pressed against the first forming core 6 of vacuum forming, compressed air forming, or vacuum forming with air pressure as it is, and the inner surface is formed into a shoulder shape by air pressure.
In FIG. 2-1 the vacuum hole 62 is provided near the boundary between the head and the shoulder of the molding core 61, and the vacuum hole 62 is connected to the vacuum pump to cover the laminated film and the molding core 61. The air in the gap between the two is evacuated, and the inner surface is brought into close contact with the shape of the molding core 61 to be molded. Of course, the molded core 61 also has a built-in cooling mechanism to absorb and cool the heat of the heat-softened laminated film so that the shape of the inner surface of the head can be maintained.
At this time, the outer side of the forming core 61 may be covered with a pot, and the air pressure on the outer side of the laminated film may be increased to high pressure to perform compressed air forming.

FIG. 2-2 is a perspective view showing a state in which the laminated film processed in the above step 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 fold-like laminated film.

FIG. 3 is a process diagram showing a process of pressing the outer folds of the laminated film processed into the shape of the inside of the head and processing the laminated film into a smoothly folded state.
In FIG. 3-1 the laminated film whose inside is molded into a head shape is pressed from the outside with a compression jig on the outside of the fold-shaped laminated film with the molding core inserted inside. The outside is compression molded.
This step is preferably processed immediately after the vacuum forming in FIG. 2 while the outer folds of the laminated film are not cooled, and may be substantially simultaneous. If the outer folds of the laminated film are cooled, it is necessary to reheat the outer side of the laminated film.
Furthermore, when the compression jig is compressed while slowly rotating so that the barrier layer is not damaged, the folds that first come into contact are tilted in the direction of rotation, and evenly tilted in a certain direction as if the umbrella was folded. 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 steps of FIG. 3 and FIG. 2 may be welded at once while being pressurized by an ultrasonic fusion horn, or may be shaped by using an impulse sealer.

FIG. 3-2 is a perspective view showing a state in which the laminated film processed in the above step is formed into a head shape with a smooth outer surface.
The outer surface is also compressed so that adjacent folds can be bent, but the barrier layer is not easily damaged, and the film fusion layers 342 are fused to each other to create a smooth outer surface. ..
In particular, even if the barrier layer is a bent tip or root of a fold, both sides are covered with a film fusion layer, so that the barrier layer is unlikely to be significantly deteriorated such as broken.

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

FIG. 5 shows the extrusion container of the present invention, in which the laminated film 34 processed into a head shape and the body portion 2 are inserted into an injection molding die, and the body portion 2 and the laminated film are injected while injecting the resin of the head base material portion. It is a process drawing which shows the process of molding the extrusion container 1 integrated with 34.
The injection molding die is composed 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 split molds, and is an injection molding die having a gate on the slide portion. However, the gate may be the shoulder portion 33 or the outer surface of the spout.
Due to the heat of the molten resin forming the head base material portion 30, the head 3 is fused with the laminated film 34, and the head base material portion 30 and the laminated film 34 are fused.

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

<Example 1>
For the body, a film in which a 12 μm silicon oxide-deposited polyethylene terephthalate film was laminated was used, and a laminated tube having a thickness of 35 mm and fused into a tubular shape was used.
As the laminated film on the head, a film of polyethylene 20 μm / silicon oxide-deposited polyethylene terephthalate 12 μm / polyethylene 20 μm was used.
As the head base material, linear low-density polyethylene was used, and the laminated film was provided on the inner surface of the head to prepare the extrusion container shown in FIG.

<Example 2>
As the laminated film of the body and the head, the same laminated tube as in Example 1 was used.
As the head base material, a resin obtained by blending linear low-density polyethylene with a metaxylylenediamine / adipic acid copolymer was used, the laminated film was provided on the inner surface of the head, and the extrusion container shown in FIG. 1 was used. Had made.

<Comparative example 1>
As the laminated film of the body portion, the same laminated tube as in Example 1 was used.
No barrier laminated film was used on the head.
A linear low-density polyethylene resin was used as the head base material, and an extrusion container was prepared without using a laminated film.

<Comparative example 2>
As the laminated film of the body portion, the same laminated tube as in Example 1 was used.
No barrier laminated film was used on the head.
As the head base material, a resin obtained by blending linear low-density polyethylene with a metaxylylenediamine / adipic acid copolymer was used to prepare an extrusion container without using a laminated film.

<Evaluation test method>
The bottom seal portion is fused, two openings are provided in the body, and the holes are fixed through a pipe, and the oxygen permeability measuring device OX-TRAN (registered trademark) 2/22 manufactured by MOCON is used. The oxygen permeability of the entire extrusion container was measured.

<Evaluation test results>
Comparative Example 1 was 0.015 cc / package / day, and Comparative Example 2 was 0.007 cc / package / day, but Example 1 was 0.005 cc / package / day, and Example 2 was 0.001 cc / package / day. It was a 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, the 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 unlikely to break or crack. In addition, since a barrier layer is provided not only on the shoulder part but also on the spout side, it is possible to reliably block the inflow of oxygen.
Further, since both sides of the barrier layer are covered with a film fusion layer, significant deterioration of the barrier layer is unlikely to occur even in a broken 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 was blended with a fusion resin.
Moreover, since no metal foil is used, foreign matter can be inspected after filling the contents by transmitting X-rays, which is a great merit of the present invention.

1 ・ ・ ・ ・ ・ ・ ・ ・ Extruded container 2 ・ ・ ・ ・ ・ ・ ・ ・ Body 21 ・ ・ ・ ・ ・ ・ ・ ・ Shoulder fusion part 22 ・ ・ ・ ・ ・ ・ ・ ・ Bottom seal part 23 ・ ・ ・ ・・ ・ ・ Sealant layer 24 ・ ・ ・ ・ ・ ・ ・ Barrier layer 3 ・ ・ ・ ・ ・ ・ ・ ・ Head 30 ・ ・ ・ ・ ・ ・ Head base material 31 ・ ・ ・ ・ ・ ・32 ........... spout 33 ..... shoulder 34 ..... laminated film 341 ..... barrier layer 342 ..... film fusion layer 343 ・ ・ ・ ・ ・ ・ Opening hole 344 ・ ・ ・ ・ ・ ・ Injection molding mold 3441 ・ ・ ・ ・ ・ Slide cavity 3442 ・ ・ ・ ・ ・ Mandrel-shaped long core 4 ・ ・ ・ ・ ・ ・ ・ ・ Cap 5・ ・ ・ ・ ・ ・ ・ ・ Far infrared heater 6 ・ ・ ・ ・ ・ ・ ・ ・ First molding core 61 ・ ・ ・ ・ ・ ・ ・ ・ Molding core 62 ・ ・ ・ ・ ・ ・ ・ ・ Vacuum hole 7 ・ ・ ・ ・ ・・ ・ ・ Fragrance (permeated gas)

Claims (7)

In an extrusion vessel that has a flexible body and presses to eject the contents.
At least, a head formed by welding a laminated film composed of a barrier layer made of a film having a barrier property and a film fusion layer made of a film fusion layer capable of being fused to either one or both of the front and back surfaces in a folded state. An extruded container characterized by having. The extrusion container according to claim 1, wherein the film having a barrier property comprises a film mainly composed of polyamide, an ethylene / vinyl alcohol copolymer, polyethylene terephthalate, and polybutylene terephthalate. The extrusion container according to claim 1 or 2, wherein the film having a barrier property is made of a metal foil film having a thickness of 20 μm or less or a film having a metal oxide vapor deposition layer. The extrusion container according to any one of claims 1 to 3, wherein the film having a barrier property is made of a film having shape retention. The shape-retaining film is a resin mainly composed of a cyclic olefin resin or a cyclic olefin copolymer resin.
Alternatively, it is composed of a uniaxially stretched high-density polyethylene film or a biaxially stretched film composed of a resin-based resin containing either polybutylene terephthalate as a main component and other polyester-based resin or polybutylene terephthalate copolymerized with dicarboxylic acid. The extruded container according to claim 4, characterized in that. The head base material that fuses with the body on the outside of the barrier laminated film that is welded in the folded state is formed by a blended resin consisting of a resin having a fusion property and a resin having a barrier property. The extruded container according to any one of claims 1 to 5, wherein the extruded container is characterized. The resin with barrier properties
Amide resin of any of metaxylene diamine / adipic acid copolymer, 6-nylon, 6,6-nylon, 6-6,6-copolymerized nylon,
Alternatively, an amide resin obtained by blending the metaxylene diamine / adipic acid copolymer with at least one of 6-nylon, 6,6-nylon, and 6-6,6-copolymerized nylon.
Ethylene-vinyl acetate copolymer saponified product (ethylene-vinyl alcohol copolymer),
The extruded container according to claim 6, wherein the extruded container is made of.

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