JPS59209532A - Can-shaped laminated vessel - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] The invention relates to a conical laminated container, and more specifically, it has excellent lightness, mechanical strength, pressure resistance, gas barrier, etc., is inexpensive, and is easy to dispose of. This invention relates to a cone-shaped laminated container.

BACKGROUND OF THE INVENTION Various types of bottles and strained cans are used as containers for contents having self-generating pressure, such as beer and carbonated drinks.

Among bottles, glass bottles do not have any major problems in terms of storage stability, but pressure-resistant glass bottles have problems in that they are heavy, have low impact strength, and are not easy to dispose of. To improve this, plastic bottles made by stretch-blow molding plastic materials that can orient molecules, such as polyethylene terephthalate, have come into use. ``I'E') It has excellent eggplantability, but on the other hand, the gas permeation through the vessel wall (1'!l 1./) can be ignored, and the storage stability is less than that of glass containers. 11.α is still quite inferior.Furthermore, the stretch blow molding method requires thermoforming of the parison and heated stretch blow molding of the parison, requiring a large number of steps and a large amount of thermal energy. lヱ・・There is a drawback that the acost is quite high.

On the other hand, in the case of a 7-squeeze can, it is desirable to make the side wall of the container as thin as possible in order to reduce the weight of the container and reduce the cost of metal materials necessary for manufacturing the pupil body. However, in the return double seaming, the surface load applied to the complex by the seaming machine is on the order of 120 to 2 rl OK7, and if the side wall is made thinner than the limit, Gjj
There is a problem in that buckling occurs when double-sealing the JJ lid, making sealing itself difficult.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a bell-shaped laminated container that is lightweight, has excellent mechanical strength, high durability, and gas barrier properties, is inexpensive, and is easy to dispose of.

Another object of the present invention is to provide a laminated container that can be formed into a can shape with a small number of steps and at a high production rate.

Still another object of the present invention is to provide a cap-shaped laminated container that has self-reliance and is easy to handle in addition to the above-mentioned characteristics.

According to the invention, at least one gas barrier layer) l
A bottomed body formed by drawing a laminate of polyester resin or polypropylene films or sheets containing an I'I resin layer and having a circumferential flange around the opening and a round bottom protruding outward; A bell-shaped laminated container is provided in which a lid made of a plastic film or sheet containing a metal layer or at least one gas barrier resin layer is joined to a body flange.

The invention further provides at least one gas barrier layer.
A body formed by drawing a laminate of a polyester resin or polypropylene film or sheet containing a resin layer and having a circumferential flange around the opening and a round bottom protruding outward at the bottom, and a metal layer. A container consisting of a lid made of a laminate of plastic films or sheets containing one or more gas barrier resin layers, joined at the flange of the body, and with a container that provides self-reliance below the flange. f: A pressure-resistant, bell-shaped laminated container characterized by being formed by fitting i bodies or cup bodies is provided. O In the bell-shaped laminated container of the present invention, the material for forming the container body is a gas barrier It is a laminate of polyester resin or polypropylene resin containing a resin layer, and the carcass is formed by drawing into a bottomed body with a round bottom that protrudes outward, and this body itself has a remarkable quality. It has pressure resistance and gas barrier properties. Moreover, by joining the lid of a laminate body provided with a metal layer or a gas barrier resin layer to the bottomed body, the storage life of the contents is further ensured.

First of all, this bottomed body is equipped with a plastic wall containing a gas barrier resin layer on the entire vessel wall, so that the passage of oxygen, water vapor, fragrance components, etc. is blocked by σq (force 1, As a result, the preservation of the contents is outstanding.The plastic sheet provided in the laminate gives the container the necessary form retention and mechanical strength, and also helps form a circumferential seam. 1) The polyester or polypropylene combined with the resin layer is a resin whose molecules are highly oriented by stretching, so it is highly oriented during drawing. Molecular orientation, strength, rigidity, impact resistance, gas
There is also the advantage that the coating properties, transparency, etc. are further improved.

Next, forming the above-described laminate into a bottomed body by drawing also brings important advantages. In other words, molding plastic bottles into bottles requires thermoforming, and the disadvantage is that the molding takes a considerable amount of time; for example, stretch blow molding requires 15 to 60 seconds. If we consider the time required to manufacture a parison by injection molding or the like and the time required to preheat the parison to the drawing temperature of 1Ml, it is clear that the time required for its manufacture is extremely long. On the other hand, in draw forming, the forming into a predetermined shape is done instantly at the time of brining, and a force of 1
, significant advantages in production speed and production quality are achieved.

In the present invention, a lid body made of a laminate of plastic films or sheets including a metal layer or at least one gas barrier resin layer is applied to the above-mentioned bottomed body. Make a connection between the flange and the flange. By using the above-mentioned laminate, it is possible to improve the gas barrier property and the bondability at the flange.

The present invention will now be described in detail based on specific examples shown in the accompanying drawings.

In FIG. 1 showing the cross-sectional structure of a laminate used for manufacturing a bottomed fuselage according to the present invention, the laminate 1 is comprised of a gas barrier resin layer 2 and a layer 6 of polyester resin or polypropylene resin. The gas barrier resin layer 2 is made of, for example, vinylidene chloride resin, acrylonitrile resin,
It is made of polyvinyl alcohol, ethylene-vinyl alcohol copolymer, etc., while polyester 7UW
<PET) In addition to polyesters mainly composed of ethylene terephthalate units such as polybutylene terephthalate, polybutylene terephthalate, polyethylene/ethylene terephthalate, etc. are used.

As polypropylene (PI), in addition to crystalline homopolypropylene, propylene copolymers mainly composed of crystalline propylene, such as propylene-ethylene copolymer and propylene-butene-1 copolymer, are used. It will be done.

An adhesive layer 4 may be interposed between the gas barrier resin layer 2 and the pETJ or PPP layer in order to improve the adhesion between both layers, and the adhesive layer 4 may be a urethane adhesive, a titanate adhesive, etc. The adhesive may be a type anchor agent, an epoxy adhesive, an acid-modified olefin resin adhesive, a copolyester adhesive, or the like.

This laminated structure 1 may have a two-layer structure, but in the specific example shown in FIG. 1, it has a structure in which a gas barrier resin layer 2 is sandwiched between two PET or PP layers. The thickness of the PT layer sheet varies depending on the degree of drawing and the required stiffness or flexibility of the container wall, but it is important to minimize the pressure deformation resistance of molded products made from this sheet. In general, it is necessary to become familiar with 6 []
0 to 5000 microns, 51 to 7ir] O no imoro mouth 0
0 micron 1), it is unexpected that it is surrounded.

On the other hand, in Fig. 2 showing a laminate with 64 layers on the lid body 1 (J, iy', 7. Gold: J(layer) or (-t) Sheet-like surface treatment of aluminum, steel, iron, tinplate, tin-free steel, etc. can be made of plastic. The layer 7 is preferably the layer 7 described above, but may be made of other thermoplastic resin having thermal adhesive properties.Metal tongue 6 A protective coating layer 8 can be provided on the outer surface of the protective layer 8, and in addition to the use of various Maki plastic films, various protective coatings, such as epoxy-phenolic paints, epoxy-amino coatings, etc. , epoxy-Nether-based paints, epoxy-vinyl paints, epoxy-acrylic FA materials, vinyl paints, acrylic paints, polyester-based 6 materials, vinyl-phenol paints, etc. are used.

An adhesive layer 4 can be interposed between the metal layer 6 and the plastic layer 7. Of course, the aforementioned gas barrier resin layer can also be used in place of the four gold Jg layers.

The laminate 1 shown in FIG. 1 is drawn into a bottomed body 12 having a circumferential flange 11 around the opening, as shown in FIG. 6. In the container body of the concrete shown in Figure 1, there is a straight side wall part 16 following the circumferential flange 11, and the part below the side wall part 16 bulges outward (downward) to form a round bottom. 14 is formed.

For drawing forming into the bottomed body 12, if the laminate sheet is made of polyester, the temperature is controlled to a warm forming temperature of 30 tT or more and 80 C or less, and press forming is performed between a male die and a female die. This can be easily done by Of course, this drawing forming is not limited to press forming, and may be performed by means known per se such as vacuum forming, plug assist forming, pressure forming, and explosion forming. Of course, drawing into the bottomed body 12 can be performed in two stages or six or more stages, such as shallow drawing and deep drawing (redraw). It is also possible to provide thinning.

The laminate 5 shown in FIG. 2 is formed into a lid 15 shown in FIG. 4 by means such as press molding. This lid body 15 has an annular rim part 16 extending in the axial direction of the container and having small intervals, a center panel 17 continuous to the lower end of the annular rim part, and a peripheral part (flange part) 18 continuous to the upper end of the rim part. 1. Even if the center panel 17 bulges upward due to internal pressure, the peripheral portion 1
It is designed so that it does not rise above 8.

When molding the container, the lid and the body can be made of laminated sheets having the same thickness, or the folded lid can be made of a laminated sheet that is thicker than the body.

Next, as shown in FIG. 5, the flanges 18 and 11 are overlapped and joined in a positional relationship such that the lid body 15 having the peripheral part for joining is on the upper side and the bottomed body 12 is on the lower side. Seam 19 is formed. The seam 19 can be formed by any means such as thermal bonding of the film substrate or the resin-coated protective layer, rotational welding, high frequency welding, ultrasonic welding, adhesive bonding, etc.

Thus, according to the present invention, a container made of a plastic laminate including a gas barrier resin layer can be easily obtained. The bottom of the body of this container has a shape that bulges or protrudes downward, that is, outward, and while the container itself has a strong pressure-resistant structure, it is difficult to stand the container upright. In other words, the problem arises that there is no independence.

This drawback can be overcome by housing the individual bottles in carton cases.

However, in the present invention, even if the bottom of the body has such a shape, a cylinder or a cup is fitted below the circumferential seam to give the container self-reliance. Defects can be effectively resolved.

In FIG. 6 showing this aspect of the invention, a cylinder 20 made of paper, plastic, or a laminate thereof is fitted into the lower body of the container body having a bulged bottom 14. The axial dimension of this cylindrical body 20 is slightly larger than the axial dimension of the body 12, and thus the circumferential joint 19 is stably supported by the upper edge 21 of the cylindrical body 20. The seam 19 and the upper edge 21 are joined with an adhesive (-1 It is also possible to join the inner surface of the cylindrical body and the outer wall of the body with an adhesive to integrate them. In this case, a stepped shoulder portion 22 is formed proximate to the connecting portion between the bottom portion 14 and the circumferential side wall 16, which bulges outward from the body 12.

A cup body 26 made of paper, plastic, or a laminate thereof is fitted into the body 12, and the open end 24 of the cup body 26 is engaged with the stepped portion 22 of the body 12, thereby integrating the two. to become Of course, the open end portion 24 and shoulder portion 22 can also be firmly joined with adhesive.

In the containers shown in FIGS. 6 and 7, excellent pressure resistance and long-term shelf life of the contents can be obtained even when the contents have autogenous pressure such as carbonated drinks and beer. A container with a self-supporting body has many advantages such as: 1. It is easy to handle, the cost of the container is low, and disposal is easy.

1 on both sides of the ethylene-vinyl alcohol copolymer layer between Examples 0 and 04, respectively. A laminated notebook made by laminating OJnTn polyethylene terephthalate (CPET) sheets with a urethane adhesive is heated to a temperature of approximately 60C, and the laminated sheets are press-molded into a bottomed body with an average wall thickness of 0.3 +rx. The outer surface of the aluminum layer is coated with an epoxy-phenol paint, and the inner surface is laminated with a polyethylene terephthalate sheet via a urethane adhesive. The mixture was welded by heating to obtain a pressure-resistant can-shaped container with an internal volume of 500σ.

The pressure-resistant container of the present invention is clearly superior to ordinary cup-shaped containers (flat-bottomed or raised-bottomed) in terms of pressure-resistant strength and content storage stability.

[Brief explanation of the drawing]

1 and 2 are sectional views of respective laminates used for the bottomed body and lid body of the present invention, and FIG. 6 is a sectional view of a bottomed body formed from the laminate of FIG. 1. 2j! Figure 4 is a cross-sectional view of the lid formed from the laminate shown in Figure 2, Figures 5 and 6 are cross-sectional views of the container body with the support base joined, and Figure 7 is the lead body joined to the bottomed body. FIG. Layer numbers 1, 5... Laminated body, 12... Bottomed body, 15... Lid body, 11.18... Circumferential flange, 19... Seam, 20...h body, 2
6... Cup body. Patent applicant: Toyo Seikan Co., Ltd. Figure 4 Figure 5 Figure 6 Figure 4 Figure 7

Claims (2)

[Claims] (1) The polyester resin to which at least one gas barrier resin layer is combined is also used to draw and form a laminate of polypropylene films or sheets. a bottomed body having a circumferential flange around the opening and an outwardly protruding round bottom, and a gas barrier 4 &; ! made of a metal layer or at least one layer. A cone-shaped laminated container formed by joining a plastic film or sheet containing a layer Ii# to a body flange. (2) At least one or more layers of gas pariyani 1!140 made by drawing and forming a laminate of polyester resin or polypropylene films or sheets containing a fat layer and a circumferential flange around the periphery and an outwardly protruding bottom part. 29 bodies consisting of a body with a round bottom and a stack of plastic films or sheets including 4 metal layers or at least one gas barrier layer 4M1 and a fat layer are joined at the flange of the body (consisting of 7 1. A pressure-resistant and pressure-resistant storage container, characterized in that the container is fitted with a cylindrical body or a cup body that provides self-reliance below the flange.