JPH101149A - Multi-layer tubular container - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a tubular container that is excellent in preserving content containing volatile and aromatic components and has a good adaptability to extrusion, a pleasant feeling of touch and an excellent design. SOLUTION: A tubular container is formed by a multi-layer extruding blow molding method so that a polyacrylonitrile copolymer layer 4 or an ethylene- vinyl alcohol copolymer layer 4 is formed as an innermost layer. In addition, a polyacrylonitrile copolymer layer 4 or an ethylene-vinyl alcohol copolymer layer 4 is also provided on the inner face of a virgin seal material 5 or packing that comes in contact with an open end of a neck to form a closed system of the container entirely surrounded by the polyacrylonitrile copolymer layer 4 or ethylene-vinyl alcohol copolymer layer 4.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a multi-layer tube container having excellent protection function, design property and economical efficiency for contents widely used in foods, pharmaceuticals, quasi-drugs, cosmetics, industrial products and the like. .

[0002]

2. Description of the Related Art In the case of a laminated tube that has been frequently used mainly for brushing teeth, its body is referred to as "tubing", and both ends in the longitudinal direction of a band-shaped laminated material are overlapped with an envelope attached. The same low-melting-point polyolefin resin is generally used for the inner and outer layers of the laminated material in order to form a tube by heating and pressing. A head portion consisting of a shoulder portion and a mouth-and-neck portion is attached to one end of the body portion attached to the cylinder by molding using the same polyolefin-based resin and by heat fusion at the same time. On the other hand, blow-molded multi-layer tubes are also widely used in cosmetics, etc., but in order to achieve stable heat sealing at the bottom, a polyolefin resin is used for the innermost layer, like the laminated tube, and the outermost layer also has a good touch. Many use polyolefin resins.

[0003]

In a conventional multi-layer tube container having a polyolefin resin as the innermost layer, a special component such as an important fragrance component or a pharmaceutical component of the content is permeated or adsorbed to change the content component. There is a problem. In order to solve this problem, it is necessary to employ a highly functional resin having excellent non-permeability and non-adsorption property of the above-mentioned special component and heat-sealing property at least on the innermost surface. However, as described above, in the case of a conventional laminated tube that cannot be attached to the barrel of the body unless it is made of the same material, it is necessary to use the above-mentioned high-functional resin on both the front and back. The specifications may affect the economic cost, and the stiffness may be too strong, resulting in a problem that the squeezing aptitude as a tube container is impaired, or the texture, that is, the feel when held by hand is impaired. In addition, it is necessary to use the same type of resin for the inner surface of the head, which not only complicates the molding of the head, but also makes it difficult to continuously form a highly functional resin at the joint between the head and the body. is there. In the case of a blow-molded multilayer tube container, the head and body are integrally molded from a multilayer extruded parison,
As described above, the sticking of the same material to the front and back of the body and the problem of joining the head and the body are also eliminated, and the high-performance resin as described above is in an easy-to-use environment. There remains a problem with the satisfactory heat sealing possibilities and the protection of the contents at the mouth and neck opening. The present invention has been made in view of the above-described problems, and has as its object to provide a multilayer tube container that uses a non-adsorbent resin on the innermost surface and achieves both non-adsorption and barrier properties.

[0004]

Means for Solving the Problems A multi-layer extrusion blow molding method is used to form at least the innermost layer into an acrylonitrile copolymer layer or an ethylene vinyl alcohol copolymer layer. An acrylonitrile copolymer layer or an ethylene vinyl alcohol copolymer layer is provided on the inner surfaces of the sheet and the packing material, and a closed system is formed by the acrylonitrile copolymer layer or the ethylene vinyl alcohol copolymer layer over the entire container.

[0005]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in more detail with reference to the drawings. FIG. 1 is an explanatory view of forming a multilayer tube container according to the present invention. FIG. 1A is a side view and a sectional view of the intermediate product 1 immediately after blow molding. In general, the multilayered extruded hot parison is sandwiched from the left and right with a cracking mold, air is blown from above to perform blow molding, and the intermediate product 1 taken out of the mold is separated from the laminated material 2 as shown in FIG. There are burrs on the top and bottom. When the burr portion W is trimmed, a multilayer tube container 10 in which a cylindrical body D, a shoulder S, and a head H including a mouth and neck N are integrally formed as shown in FIG. 1B is obtained. However, the upper part of the mouth and neck N is open to form an open end 3, and the lower part is the open end 4 of the trunk D.

FIG. 2 is an enlarged sectional view of the head H when the open end 3 of the mouth and neck N is virgin-sealed. FIG.
Is an enlarged sectional view of the head portion H when the open end 3 of the mouth and neck N is packed. The above multilayer tube container 10
Is to cap the open end 3 of the mouth and neck N by virgin sealing a film or sheet 5 to be described later or to cap the mouth and neck N directly by using a cap 7 fitted with a packing material 6 to be described later. To close the open end 3. By the above-described measures, the content retention property of the multilayer tube container according to the present invention until the initial opening is maintained. When using the contents at one time, either of these may be adopted, but when repeatedly opening and closing the cap and dispensing the contents many times,
It is necessary to provide a packing material inside the cap. The virgin seal also has a function of preventing mischief in a store or in a physical distribution process. Lastly, after filling the contents from the open end 4 of the body, the body is heat-sealed with the heat seal jaws sandwiching the body end from the left and right as shown by the dotted line in FIG. To close.

In the multilayer tube container 10 according to the present invention formed through the above process, as shown in FIGS. 2 and 3, the body D and the head H are continuous, and the inner surface thereof is non-adsorbent. An acrylonitrile copolymer (PAN) layer 4 or an ethylene vinyl alcohol copolymer (EVOH) layer 4 having excellent content protection properties is continuously formed. Also, the innermost surfaces of the virgin seal film or sheet 5 and the packing material 6 are also PAN or EVO.
An H layer is formed. As shown in FIGS. 2 and 3, when the cap 7 is applied, the PAN or EVOH layer 4 is continuous at the open end 3 of the mouth and neck N, while the innermost PAN or EVOH layer 4 is also formed at the bottom. Since the members are heat-sealed to face each other, a closed system with a PAN or EVOH layer is formed on the inner surface of the multilayer tube container 10 according to the present invention. In order to obtain good adhesion for this bottom, the grades of PAN and EVOH were examined and the following was decided to be used. PAN: manufactured by Mitsui Toatsu Chemical Co., Ltd., Barex # 1320 EVOH: manufactured by Kuraray Co., Ltd., EP-E105B

Hereinafter, the specific laminated structure and specifications of the laminated material 2 used in the multilayer tube container according to the present invention will be described. The following laminated structure is used from the surface. PE / TIE / EVOH PE / TIE / PAN PE / TIE / EVOH / TIE / PAN PE / RE / TIE / EVOH PE / RE / TIE / PAN PE / RE / TIE / EVOH / TIE / PAN where EVOH ethylene vinyl alcohol Copolymer layer PAN Acrylonitrile copolymer layer PE Polyethylene layer TIE Adhesive resin layer For example, Admar NF500 (Mitsui Petrochemical Co., Ltd.) Modick (Mitsubishi Chemical Co., Ltd.) Admar SE800 (Mitsui Petrochemical Co., Ltd.) RE Recycle resin layer Resin layer formed by grinding and reusing burrs generated during molding The thickness of each layer is 30 to 100 μm for PAN, 30 to 100 μm for EVOH, 100 to 400 μm for PE, TIE
Is preferably in the range of 30 to 50 μm. The body diameter of the multilayer tube container is generally 20 to 50 mm, and the total thickness is not constant depending on the location.
It is 00 to 600 μm.

The virgin seal has the following structure. The total thickness is preferably about 60 to 140 μm. PET12 / Al (aluminum foil) 20 / PAN30-10
0 PET12 / Al (aluminum foil) 20 / EVOH 30-1
The packing material 6 has the following layer configuration. PE100-200 / polyethylene foam sheet200-
500 / adhesive layer 30 / PAN 30-100 PE 100-200 / foamed polyethylene sheet 200-
500 / adhesive layer 30 / EVOH 30-100

Since the multilayer tube container according to the present invention is formed by blow molding, a seam does not remain on the surface unlike a laminated tube, and the degree of freedom of the outermost resin layer is large.
Although it is a curved surface printing, dry offset method, silk screen printing method and transfer printing method using letterpress can be used,
In addition, decoration such as foil stamping is also possible, resulting in a beautiful finish.

[0011]

EXAMPLES A multilayer tube container having a body outer diameter of 38 mm and a height of 170 mm (body length of 150 mm) was experimentally manufactured as an example sample with the following laminated structure. PE250 / TIE30 / EVOH50 Total thickness 330 μm PE250 / TIE30 / EVOH30 / TIE3
0 / PAN100 total thickness 440 μm The virgin seal and the packing material used each had the following layer configuration. Virgin seal PET12 / Al20 / EVOH30
(PAN100) Packing material PE150 / foamed polyethylene sheet 500 / TIE30 / EVOH30 (PAN100) A PP molded product was used for the cap. After filling the toothpaste containing vitamin E into the conventional toothpaste tube containers prepared as the above example samples and comparative example samples, after storing for 30 to 60 days under the condition of forced storage at 50 ° C., the quality of the contents The change was checked organoleptically.
While a change was observed on day 0, no change was observed up to 60 days in the example samples. In addition, there was no difference between the case where the virgin seal was used and the case where the packing was performed without the virgin seal until the initial opening. Further, when a sensory test of the extruding function as a tube container was performed, both the extruding suitability and the feel of hand were good.

[0012]

According to the multilayer tube container of the present invention, the non-adsorptive PAN or EVOH provided on the innermost layer
Since the closed system is formed by the resin layer, it is possible to provide a multilayer tube container excellent in the protection function of contents including volatile components, aromatic components, and the like. In addition, since the blow molding is performed from the multi-layer extruded parison, the closed system is easier to form than other molding methods, has no seams seen in a laminated tube, is excellent in design, and can further recycle burrs. Material cost can be reduced. Furthermore, since the resin between the surface of the multilayer tube container and the intermediate resin can be freely selected, a resin having good touch, good extrusion suitability and the like can be obtained.

[Brief description of the drawings]

FIG. 1 is an explanatory view of forming a multilayer tube container according to the present invention.

FIG. 2 is an enlarged cross-sectional view of the head portion when the open end of the mouth and neck is virgin-sealed.

FIG. 3 is an enlarged cross-sectional view of the head portion when the open end of the mouth and neck is packed.

[Description of Signs] 1 Intermediate product 2 Laminated material 3 Open end of mouth and neck 4 Open end of body 5 Virgin seal film or sheet 6 Packing material 7 Cap 10 Multilayer tube container according to the present invention B Bottom D Body H Head N Mouth and neck S Shoulder W Burr

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[Procedure amendment]

[Submission date] August 21, 1996

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0011

[Correction method] Change

[Correction contents]

[0011]

EXAMPLES A multilayer tube container having a body outer diameter of 38 mm and a height of 170 mm (body length of 150 mm) was experimentally manufactured as an example sample with the following laminated structure. PE250 / TIE30 / EVOH50 Total thickness 330 μm PE250 / TIE30 / EVOH30 / TIE3
0 / PAN100 total thickness 440 μm The virgin seal and the packing material used each had the following layer configuration. Virgin seal PET12 / A120 / EVOH30
(PAN100) Packing material PE150 / foamed polyethylene sheet 500 / TIE30 / EVOH30 (PAN100) A PP molded product was used for the cap. Further, a tube container used for a conventional toothpaste or the like having the following laminated structure was prepared as a comparative sample. PE200 / TIE30 / EVOH30 / TIE30 /
PE200 A toothpaste containing vitamin E is filled into the above-mentioned example sample and comparative example sample, and under a forced storage condition of 50 ° C., 30 to
After the storage for 60 days, the quality change of the contents was checked organoleptically. In the comparative example, the change was seen on the 10th day.
No change was observed in the example samples up to 60 days. In addition, there was no difference between the case where the virgin seal was used and the case where the packing was performed without the virgin seal until the initial opening. Further, when a sensory test of the extruding function as a tube container was performed, both the extruding suitability and the feel of hand were good.

Claims (2)

[Claims] 1. A multilayer tube container formed by a multilayer extrusion blow molding method, wherein at least the innermost layer comprises a polyacrylonitrile copolymer layer or an ethylene vinyl alcohol copolymer layer. 2. An acrylonitrile copolymer layer or an ethylene vinyl alcohol copolymer layer is provided on an inner surface of a virgin seal film or sheet and a packing material which is in contact with the mouth and neck opening end, and an acrylonitrile copolymer layer or ethylene vinyl The multilayer tube container according to claim 1, wherein a closed system is formed by an alcohol copolymer layer.