JPH0811157A - Squeeze-out tubular container - Google Patents

Abstract

PURPOSE:To cut off light by crumpling a laminated film obtained by laminating specific polyolefin films into a cylindrical shape and bonding the mating surface of the film to form a cylinder. CONSTITUTION:A polyolefin film 3 containing 3-18wt.% of titanium oxide is laminated to one surface of a film l of a copolymer consisting of 30-60mol% of ethylene and 40-70mol% of vinyl alcohol through an adhesive 2 and a polyolefin film 4 containing 0.7-2.6wt.% of titanium oxide, 0.06-0.20wt.% of titanium yellow and 0.01-0.03wt.% of carbon black is laminated to the other surface of the film 1 through the adhesive 2. This laminated film is crumpled into a cylindrical shape and the mating surface of the film is bonded to form a cylinder A. A resin compsn. containing polyolefin is subjected to injection molding at one end of the cylinder A to mold a shoulder part and a mouth part to weld the end of the shoulder part to one end of the cylinder A.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a squeezed tubular container suitable for containing a pasty product containing vitamins and the like.

[0002]

2. Description of the Related Art Generally, a squeezed tubular container is suitable as a container for containing pasty products. The squeezed tubular container has a structure in which a tubular portion, a shoulder portion, and a mouth portion are integrated. That is, one end of a crushable cylinder is integrally formed with a conical truncated shoulder, and a cylindrical mouth is integrally attached to the end of the shoulder to form a container body. Is. The mouth part is covered with a removable cap.

The pasty product contains a liquid component therein. When this liquid component escapes from the pasty product, the pasty product solidifies and cannot be squeezed out of the tubular container. Therefore, the tubular container is required to be made of a material that does not allow liquid to easily pass therethrough. In addition, some pasty products gradually oxidize and deteriorate when exposed to air. Therefore, the tubular container is required to be made of a material that does not allow oxygen to easily pass through.
Further, in the case of pasty food, the tubular container needs to be made of a material that is harmless even if its inner surface comes into contact with food.
In addition, for contents containing vitamins and the like, it is necessary to block light so that the vitamins in foods are not decomposed by light.

The squeezed tubular container must have a tubular portion that can be easily crushed. Therefore, the squeezed tubular container is often made of synthetic resin recently. Generally, a synthetic resin originally has a property of allowing air and water to permeate. However, some synthetic resins are relatively impermeable to air, and some are relatively impermeable to water vapor. Therefore, it has been carried out to select a synthetic resin that is relatively impermeable to air and water vapor, and combine them appropriately to form a container. Specifically, films were made of synthetic resins that are less likely to allow air and water vapor to pass through, and these films were laminated to form a laminated film, and a container was made of this laminated film.

Further, the synthetic resin essentially has a property of transmitting light. Therefore, in order to put things that are easily decomposed by light, such as contents containing vitamins, etc., it is necessary to process a synthetic resin film so that light cannot pass through. For this reason, a method of attaching a metal foil such as aluminum to a synthetic resin film or depositing a metal such as aluminum has been used so far. However, there is a problem in that it is not easy to carry out because a special device and a special technique are required to form the metal foil or the metal vapor deposition film.

On the other hand, as a method for producing a squeezed tubular container, an insert injection molding method is known. In this method, a tubular portion is made separately in advance, this is first inserted into a mold for injection molding, and then a molten resin is injected into the die to form a shoulder portion and a mouth portion. The ends are fused to the shoulders to form a unit, thus creating the body of the squeezed tubular container. This method is an easy method for making a squeezed tubular container, but when using a synthetic resin film having a metal foil or a metal vapor deposition film on the surface as described above, there is a problem that it becomes difficult to carry out. It was

[0007]

The present invention has been made in order to solve the above problems. That is, the present invention aims to provide a squeezed tubular container suitable for containing a product that is easily decomposed by light, such as a pasty product containing vitamins and the like. Moreover, the squeezed tubular container will be able to be manufactured by using the technology conventionally used for processing conventional synthetic resins, without using special materials such as metal foil or metal film. It is what

[0008]

The inventor has decided to use, as a laminated film forming a cylinder, a laminated film made of a resin that is less likely to transmit water vapor and a resin that is less likely to allow air, especially oxygen, to pass through. Specifically, polyolefin is used as a resin that is less permeable to water vapor, and a copolymer of ethylene and vinyl alcohol is used as a resin that is less permeable to air, especially oxygen. As the copolymerization ratio of ethylene and vinyl alcohol, ethylene is 3
It was found that a copolymer of 0 to 60 mol% and vinyl alcohol in a proportion of 40 to 70 mol% was suitable. Further, it has been found that it is convenient to use a copolymer film of ethylene and vinyl alcohol as a core and to laminate a polyolefin film on both sides thereof to form a laminated film when these resins are used in combination.

To block light, the polyolefin film on one side is made white and opaque by containing 3 to 18% by weight of titanium oxide, and the polyolefin film on the other side is oxidized to 0.7 to 2.6% by weight. Titanium and 0.06-0.
It has been found suitable to include 20% by weight titanium yellow and 0.01 to 0.03% by weight carbon black to render it gray opaque. The present invention has been completed based on such knowledge.

According to the present invention, 3 to 18% by weight of titanium oxide is attached to one side of a film of a copolymer comprising 30 to 60% by mole of ethylene and 40 to 70% by mole of vinyl alcohol via an adhesive. Containing polyolefin film, and 0.7 to 2.6% by weight of titanium oxide and 0.06 to 0.
One end of a tube obtained by laminating a laminated film obtained by laminating a polyolefin film containing 20% by weight of titanium yellow and 0.01 to 0.03% by weight of carbon black into a tubular shape and adhering the joints. In addition, the present invention relates to a squeezed tubular container obtained by injection-molding a polyolefin-containing resin composition to form a shoulder portion and a mouth portion, and fusing the ends of the shoulder portion to one end of the cylinder.

An example of the present invention will be described below with reference to the drawings. FIG. 1 is a partially cutaway vertical sectional view of a squeezed tubular container (hereinafter, simply referred to as a container) according to the present invention. FIG. 2 is an exploded cross-sectional enlarged view of a laminated film forming the cylindrical portion of the container according to the present invention. FIG. 3 is a perspective view showing a mode in which a laminated film is rolled into a tubular shape in making the container according to the present invention. FIG. 4 is a cross-sectional view of a mold used for making the container according to the present invention.

As shown in FIG. 1, the container according to the present invention comprises a container body composed of a cylinder portion A, a shoulder portion B, and a mouth portion C, and a cap D fitted in the mouth portion C. It The tubular portion A is formed of a crushable material into a tubular shape. The shoulder portion B is welded to one end of the tubular portion A to be integrated with the tubular portion A, has a truncated cone shape that is squeezed toward the mouth portion C, and has a hollow interior. The mouth portion C has a small cylindrical shape provided with a locking protrusion E, for example, a screw on the outer surface, and is integrally formed with the shoulder portion B. The cap D is provided with irregularities F on the inner shell, and the irregularities F are adapted to fit into the protrusions E of the mouth portion C.

As shown in FIG. 1, the cap D is provided with a frustoconical cover G that covers even the shoulder B on the outside of the cylinder having the concavities and convexities F, and an opening H at the upper end of the cylinder. Cover G
A lid K that can be opened and closed by a hinge J is attached to one side of the lid K, and a protrusion L is attached to the lid K, and the opening H is closed by the protrusion L as the lid K is opened and closed. The connecting portion M
Serves as a spring when the lid K is opened and closed.

The tubular portion A is made of a laminated film.
The laminated film is composed of five layers as shown in FIG. Film 1 located in the center
Is a copolymer of ethylene and vinyl alcohol (hereinafter,
This is abbreviated as EVOH). Film 2 is a layer of adhesive, which is made of a copolymer of ethylene and an unsaturated carboxylic acid. Films 3 and 4 are films made of polyolefin. Therefore, the laminated film of FIG. 2 is a film 1 made of EVOH.
It can be said that the polyolefin films 3 and 4 are adhered to both sides of the adhesive via the adhesive 2.

EVOH is a copolymer of ethylene and vinyl alcohol as described above. The copolymerization ratio is within a range in which ethylene accounts for 30 to 60% and vinyl alcohol accounts for 40 to 70% by molar ratio.
EVOH is produced by saponifying a copolymer obtained by copolymerizing ethylene and vinyl acetate to convert vinyl acetate into vinyl alcohol. EVOH is known as a resin that easily absorbs water but hardly allows gas to permeate in a dry state, especially a resin that hardly permeates oxygen.

EVOH films are commercially available. For example, it is sold under the trade name Soarnol by Nippon Synthetic Chemical Company and under the trade name Kuraray Eval by Kuraray. As the film 1, these commercially available films can be used.

The film 2 is made of a copolymer of ethylene and an unsaturated carboxylic acid as described above. Various unsaturated carboxylic acids can be used.
For example, maleic anhydride and acrylic acid can be used. An adhesive that can be used as the film 2 is also commercially available. For example, a product sold under the trade name of Admer by Mitsui Petrochemical Co., Ltd. and marketed under the trade name of Modic by Mitsubishi Petrochemical can be used.

The resin forming the films 3 and 4 is polyolefin. As the polyolefin, either polyethylene or polypropylene can be used.
Among polyethylene, there are low-density polyethylene and high-density polyethylene, and it is preferable to use low-density polyethylene among them.

What distinguishes the film 3 from the film 4 is the coloring material contained therein. One of the films 3 and 4 such as the film 3 mainly contains titanium oxide and becomes white and opaque, while the other film, that is, the film 4 includes titanium oxide, titanium yellow and carbon black. Including,
It is gray and opaque. The white opaque film 3 contains titanium oxide in an amount of 3 to 18% by weight, and the gray opaque film 4 contains 0.7 to 2.6% by weight of titanium oxide and 0.06 to 0.20% of titanium yellow. %, Carbon black in an amount of 0.01 to 0.03% by weight.

Titanium oxide contained in the film 3 is 3 to 1
The reason why it is limited to 8% by weight is that if it is less than 3% by weight, it is not enough to block light, and if it exceeds 18% by weight,
It becomes difficult to process polyolefin into film,
Also, the properties of the obtained film are deteriorated. Further, the titanium oxide contained in the film 4 is 0.7 to 2.6.
% By weight, titanium yellow 0.06 to 0.20% by weight,
The reason why the carbon black is limited to 0.01 to 0.03% by weight is to make the color gray and to be beautiful, and to make it harmless even when it comes into contact with food, and at a wavelength of 400. This is to absorb light in the range of to 700 nm (nanometer) well.

The thickness of each film in the laminated film shown in FIG. 2 is preferably set as follows. The film 1 has a thickness of 10 to 100 μm, and the adhesive layer 2
Is 10 to 50 μm, but it is preferable that it is as thin as possible.
~ 200 μm, the total thickness of the laminated film is 130 ~
It is 600 μm. The reason is that the thickness of film 1 is 1
This is because if it is less than 0 μm, the oxygen barrier property is not sufficient, and if it is 50 μm, the oxygen barrier property is sufficient, and it is 50 μm.
This is because there is no particular profit even if it exceeds. Also, layer 2
Since it only serves as an adhesive, it is preferable that the thickness is thin, and it is not necessary that the thickness exceeds 50 μm, but conversely, if the thickness is less than 10 μm, the adhesive strength is insufficient.

Since the film 3 and the film 4 are the main constituents of the laminated film, they are generally easy to crush, have strength to withstand crushing, and exhibit a water vapor barrier property. It is preferably as thin as possible.
Therefore, the thickness is set to 50 to 200 μm. Film 3
The film 4 and the film 4 may have different thicknesses, but preferably have the same thickness.

The laminated film shown in FIG. 2 is the film 1
Since EVOH consisting of 30 to 60 mol% of ethylene and 40 to 70 mol% of vinyl alcohol is used for the above, it has the property of blocking oxygen, and the polyolefin is used for the films 3 and 4. Since it has the property of blocking water vapor, the laminated film as a whole is unlikely to permeate oxygen and water vapor. Therefore, this laminated film is suitable for storing paste-like products for a long time without deterioration. Further, both EVOH and polyolefin are highly flexible and strong against bending, and are adhered via an adhesive, so that the laminated film is suitable for crushing and squeezing pasty products. . On top of that, since the film 3 contains 3 to 18% by weight of titanium oxide, it becomes white opaque and difficult to transmit light.
Further, the film 4 contains 0.7 to 2.6% by weight of titanium oxide and 0.06 to 0.20% by weight of titanium yellow.
Since it contains 0.01 to 0.03% by weight of carbon black, it becomes opaque in a gray color and blocks light, so that the laminated film as a whole blocks light and blocks light such as vitamins. Therefore, when you put something that can be easily decomposed in it, it is suitable for storing without decomposing it.

In order to form the cylindrical portion A using the laminated film shown in FIG. 2, as shown in FIG. 3, the laminated film is simply rolled and the overlapping ends are bonded with the above-mentioned adhesive. Good. Alternatively, instead of using an adhesive, the overlapped portion may be heat-sealed to form the cylindrical portion A. When rolling the laminated film, it is preferable that the white opaque film is placed outside.

To insert the shoulder portion B and the mouth portion C into an integral body by using the tubular portion A, the well-known insert injection molding is performed as described above. This can be done, for example, as shown in FIG. In FIG. 4, 1
0 is an outer mold, 11 is an inner mold, and when the inner mold 11 is inserted into the outer mold 10, just the cylinder portion A, the shoulder portion B, and the mouth portion C are molded between them. It has a fovea. At this time, the cylindrical part A made of the above-mentioned laminated film is fitted into the inner mold 11, and the inner mold 11 is advanced into the outer mold 10 to form a mold. Then, the cylindrical portion A is inserted into the mold, and only a portion corresponding to the shoulder portion B and the mouth portion C becomes a gap in the mold. Therefore, molten synthetic resin is injected and filled in this gap, the mold is cooled and the resin is solidified, and then the inner mold 11 is retracted to take out the container.

In the case of performing the above-mentioned injection molding, the resin to be injected is polyolefin alone or the above-mentioned EVO.
Use a mixture of H and titanium oxide 3
~ 18% by weight, or even 0.06
It is preferable to use titanium yellow of about 0.20 and carbon black of 0.01 to 0.03% by weight. When EVOH is mixed with polyolefin, the polyolefin accounts for 50 to 77% by weight.
It is used by mixing in a proportion such that H accounts for 20 to 50% by weight and thoroughly kneading to obtain a uniform composition.

When the resin is injection-molded as described above, not only the shoulder portion B and the mouth portion C can be easily molded, but also the molded shoulder portion B is easily and firmly bonded to the tubular portion A made of a laminated film. Will be fused to. Further, both the shoulder portion B and the mouth portion C thus obtained are less likely to transmit water vapor, oxygen and light. Therefore, the container obtained here is suitable for containing paste-like products such as vitamins that are easily decomposed by light, storing them for a long time without deteriorating them, and squeezing them when necessary.

In FIG. 2, a laminated film having five layers is shown, but another synthetic resin film is interposed between them to bond them together, or a film made of only a polyolefin containing no powder of titanium oxide or the like on the surface thereof. The present invention can be carried out by making a change such that the surfaces are bonded to each other to give a glossy surface.

[0029]

EFFECT OF THE INVENTION According to the present invention, a film of a copolymer composed of 30 to 60 mol% of ethylene and 40 to 70 mol% of vinyl alcohol is provided on one side of the film with an adhesive agent.
-18% by weight of a titanium oxide-containing polyolefin film is laminated, and 0.7-2.6% by weight of titanium oxide is bonded to the other side of the copolymer film via an adhesive,
6 to 0.20% by weight of titanium yellow and 0.01 to
Since a polyolefin film containing 0.03% by weight of carbon black is laminated to form a laminated film, and the laminated film is rolled into a tubular shape and a seam is adhered to the tubular portion, the tubular portion is flexible. Therefore, it can be crushed, is not destroyed even if crushed, and can easily be restored to its original state, has a high barrier property between water vapor and oxygen, and has a large property of blocking light. Such a resin composition containing a polyolefin is injection-molded at one end of the tubular portion to form a shoulder portion and a mouth portion, and the end of the shoulder portion is fused to the end of the tubular portion. It is easy to obtain a container in which the shoulder portion is easily and firmly fused to the tubular portion. Therefore, the obtained container is suitable for storing, for example, a pasty product that is easily deteriorated by light, such as a vitamin-containing cosmetic, without being deteriorated for a long time.

Since the copolymer and the polyolefin are harmless, the container is suitable for containing food. Moreover, in the present invention, since no metal foil or metal vapor deposition film is used, a container can be easily manufactured by a conventional resin molding method, and a defective container can be easily crushed and reused. It is also easy to incinerate and discard. The present invention provides such benefits.

When the cap D having the structure shown in FIG. 1 is used, oxygen, water vapor and light are less transmitted through the shoulder portion B and the mouth portion C, and the product can be stored for a long time without deterioration. You can

[Brief description of drawings]

FIG. 1 is a partially cutaway vertical sectional view of a container according to the present invention.

FIG. 2 is an exploded cross-sectional enlarged view of a laminated film that constitutes the cylindrical portion of the container according to the present invention.

FIG. 3 is a perspective view showing a process of making a cylindrical portion of the container according to the present invention.

FIG. 4 is a cross-sectional view of a mold used for making the container according to the present invention.

[Explanation of symbols]

A Cylinder B B Shoulder C Mouth D Cap 1 Ethylene and vinyl alcohol copolymer film 2 Adhesive layer 3 White opaque polyolefin film 4 Gray opaque polyolefin film 10 External type 11 Internal type

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI Technical display location C08L 29/02 LGT C09C 1/36 PAX 1/48 PBE

Claims (1)

[Claims] 1. 30-60 mol% ethylene and 40-
A polyolefin film containing 3 to 18% by weight of titanium oxide is adhered to one side of a copolymer film composed of 70 mol% vinyl alcohol via an adhesive, and adhered to the other side of the copolymer film. 0.7 through the agent
A laminated film obtained by laminating a polyolefin film containing 2.6% by weight of titanium oxide, 0.06 to 0.20% by weight of titanium yellow, and 0.01 to 0.03% by weight of carbon black. The resin composition containing a polyolefin is injection-molded at one end of a cylinder formed by rolling it into a cylindrical shape and adhering seams to form a shoulder portion and a mouth portion, and the end of the shoulder portion is provided at one end of the cylinder. A squeezed tubular container that is fused.