JPS6169571A - Sheet made of synthetic resin and vessel made of said sheet - 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 [Field of Industrial Application] The present invention relates to a synthetic resin container having a breakable band and a sheet container formed from the synthetic resin sheet. The purpose of this is to allow the sheet to be divided smoothly and neatly by the band.

[Conventional technology]

There is a synthetic resin sheet that is integrally formed with a sheet main body and a break zone by co-extrusion molding, with the break band dividing the sort main body into left and right parts, and this sheet can be used to form containers such as bags and tube containers. Ta.

This type of synthetic resin sheet with a break band is designed so that the mechanical strength of the entire sheet can be maintained in a sufficiently crystalline state until the main body of the sheet is separated by the break band. On the other hand, it is necessary to set the adhesive strength between the sheet main body and the break band to a sufficiently high value so that the breaking action of the sheet main body by the break band can be achieved smoothly and reliably. Conflicting functions that cannot be made larger are required.

For this reason, conventional synthetic resin sheets of this type with break bands have a relatively high adhesive strength between the main body of the sheet and the break band in order to satisfy the contradictory requirements mentioned above.
The hardness of the rupture band itself is increased compared to the main body of the sheet, thereby increasing the mechanical strength of the sheet as a whole, and the joint between the rupture band and the main body of the sheet is destroyed by specified handling such as bending. The aim was to achieve sheet-based separation.

[Problem that the invention seeks to solve]

However, in the case of the above-mentioned conventional example, a considerably large force is required to peel off the adhesive between the main body of the sheet and the rupture zone, which makes it extremely difficult to perform the IFr operation on the entire sheet. Moreover, a large number of unnecessary thread-like synthetic resin pieces are formed on the end surface of the sheet main body from which the rupture band is peeled off, causing discomfort to the user.

In addition, the hardness of the fracture zone is high in order to sufficiently increase its mechanical strength, but this makes it mechanically brittle. During the cutting operation, this breaking band bends too much and is cut, resulting in the inconvenience that subsequent cutting of the entire sheet cannot be achieved.

Furthermore, when trying to mold a sorting container using a thermoforming method such as vacuum forming or pressure forming using this synthetic resin sheet with breakage bands, the damage occurs due to the action of heat acting on the sheet during thermoforming.

The adhesive strength between the sheet main body and the rupture band is greatly increased, which makes it almost impossible to peel off the sheet main body and the rupture band manually. It was not possible to form thermoformed containers using sheets.

[Means for solving problems]

The present invention was devised to solve the problems, inconveniences, and shortcomings of the conventional examples described above.
The first synthetic resin material is mainly a first synthetic resin material for sheet main body molding.

a second synthetic resin material that cannot be bonded to the first synthetic resin material; a third synthetic resin material that allows the second synthetic resin material to be bonded to the first synthetic resin material; By mixing and molding the fourth synthetic resin material to soften the entire rupture zone, it is possible to set the adhesive force between the main body of the sheet and the rupture zone to an appropriate value, and to The adhesive force between the sheet main body and the rupture zone does not change even when heated by the rupture zone.

DESCRIPTION OF THE PREFERRED EMBODIMENTS Two synthetic resin type sheets according to the present invention and a sheet container using this sheet will be described below with reference to drawings showing one embodiment thereof.

The synthetic resin sheet 1 according to the present invention includes a sheet main body 2,
A synthetic resin sheet is formed by integrally co-extruding a thin strip-shaped breakage band 3 that divides the sheet main body 2 into left and right parts, and the breakage band 3 is made of a first material that is the molding material of the sheet main body 2. a synthetic resin material, a second synthetic resin material that cannot be bonded to the first synthetic resin material, and a second synthetic resin material that makes it possible to bond the second synthetic resin material and the first synthetic resin material. 3 and a fourth synthetic resin material for giving softness to the molded breakage band 3, the melt index value T of the breakage band 3 is set to the sheet main body. Melt index value M of 2
The softening temperature point T'' of the rupture zone 3 is set to be the same as or slightly lower than the softening temperature point i'' of the sheet main body 2.

Moreover, the container 4 according to the present invention molded using this Seai 1 is molded by integrally coextruding the sheet main body 2 and the thin strip-shaped breakage band 3 that divides the sheet main body 2 into left and right parts. , the breaking band 3 is made of a first synthetic resin material that is the molding material of the sheet main body 2, a second synthetic resin material that cannot be bonded to this first synthetic resin material, and this second synthetic resin material. Mixing of a third synthetic resin material for making it possible to bond the material and the first synthetic resin material, and a fourth synthetic resin material for making the molded breakage band 3 soft. Molded from a resin material, the melt index value T of the break zone 3 is set to the melt index value M of the sheet main body.
The synthetic resin sheet 1 is vacuum-formed, and the softening temperature point T' of the fracture zone 3 is set to the same or slightly higher value than the softening temperature point 1' of the sheet main body 2. The container body 5 is formed into a desired shape by a ripening means such as air pressure forming, and the end of the breaking band 3 is attached to one end of the container body 5 as a knob 10 to protrude.

[Effect]

In other words, the sheet 1 according to the present invention has a break band 3 which is integrally co-extruded with the sheet main body 2 divided into left and right parts.
A first synthetic resin material, which is the molding material of the sheet main body 2, is used as a main component, and a second synthetic resin material that cannot be bonded to the first synthetic resin material is added to the first synthetic resin material. A third synthetic resin material for making the second synthetic resin material bondable to the first synthetic resin material is mixed and added, so that the second synthetic resin material and the third synthetic resin material conflict with each other. Utilizing these characteristics, it is possible to set the adhesion force of the rupture band 3 to the sheet main body 2 to a desired value.

In this way, the adhesive force between the sheet main body 2 and the break band 3 of the sheet l according to the present invention is
This is determined by the physical properties of the synthetic resin material used to mold the sheet, so even if heat treatment is applied externally to the sheet 1, the adhesive force between the sheet main body 2 and the breakage band 3 will change. There's nothing to do.

Furthermore, the melt index value T of the fracture zone 3 is as follows.

Since the melt index value M of the sheet main body 2 is set to a value equal to or slightly smaller than that of the sheet main body 2, bending deformation cannot be achieved satisfactorily due to the rupture zone 3 when handling the formed sheet 1. It can be handled in almost the same way as a normal synthetic resin sheet without causing any inconvenience.

Furthermore, since the softening temperature point T' of the rupture zone 3 is set to a value equal to or slightly higher than the softening temperature point h' of the sheet main body 2, some kind of heating for forming the sheet 1 is applied externally. Even if the rupture band 3 is added from above, the rupture band 3 may be curved and bent along its length without losing its narrow band shape.

Then, since the molded container 4 is attached with a knob 10, the user can pick this knob 10 with his or her fingertips.

By pulling up along the fracture zone 3.

Separation occurs between the Seay main body 2 and the rupture zone 3, and the container 4 can be opened by this separation.

〔Example〕

The sheet 1 according to the present invention is formed by integrally extruding the sheet main body 2 and the breakable band 3 by co-extrusion.
For example, when the sheet main body 2 is molded from polypropylene resin, the first synthetic resin material for molding the breakage band 3 is polypropylene resin, and the second synthetic resin material is a synthetic resin material that cannot be bonded to this polypropylene resin. 2, for example, nylon or ethylene/vinyl alcohol copolymer resin, the third synthetic resin material is an adhesive polymer that enables bonding of the second synthetic resin material and polypropylene resin, and the fourth synthetic resin The material is made by cross-linking the molecules of ethylene-methacrylic acid copolymer with metal ions (A
A possible combination is that it is fat.

The mixing weight ratio of each of the above-mentioned synthetic resin materials for forming this broken 11i band 3 is determined by the required adhesive strength between the sheet main body 2 and the broken band 3, the use of the molded sheet 1 or the container 4. Although it differs depending on the purpose and conditions of use, the results of many experiments have shown that the first synthetic resin material, polypropylene resin, has a content of 30 to 50%, while the second synthetic resin material, a non-adhesive material, 3 to 20%, the third synthetic resin material, adhesive polymer, 30 to 50%, and the fourth synthetic resin material, ethylene-methacrylic acid copolymer resin, 5 to 20%.

The container 4 shown in FIGS. 2 and 3 is formed by thermoforming using the sheet l according to the invention shown in FIG. 1, and includes a bowl-shaped container 6 and a lid 7. are connected by a hinge 9, joint flanges 8 are provided around the outer peripheral ends of the container 6 and the lid 7, and the rupture band 3 is positioned so as to pass through the hinge 9 and cross the container 6 and the lid 7. A lid body 7 that constitutes the container body 5 and is on the opposite side of the hinge 9
The grip piece 10 is formed by extending the end of the break band 3 located at the peripheral edge of the grip.

The grip piece 10 is formed into a hook shape so that handling of the container 4 is convenient, and the grip piece 10 can be pulled with a fingertip.
It makes it easy to pick.

The container 4 is formed by forming a flat sheet 1 into a desired shape by a ripening method and, at the same time, cutting the sheet 1 as shown in FIG. 2 to complete the forming.

The container 4 formed in this manner is bent at the hinge 9 and the two joint flanges 8 are overlapped, as shown in FIG. Hermetically sealed storage of the contents is achieved by tightly adhesively fixing the contents by appropriate means.

To open the container 4 in which the contents are sealed, as shown in FIG.
This is achieved by separating the
Since the break band 3 is wrapped around the entire circumference of the sealed container 4, by completely peeling off and removing the break band 3, the container r34 is divided into two parts at the center. It will be opened.

By the way, when forming the sheet 1 into the container 4 by the thermoforming method, the sheet main body 2 and the breakage band 3 that constitute the sheet 1 are as follows.
It is softened by the action of heat in the thermoforming method and is thereby formed into the desired shape of the container 4, and the softening temperature point T'' of the rupture zone 3 is the same as or slightly higher than the softening temperature point i'' of the sheet main body 2. Therefore, the rupture band 3 is formed as a part of the container 4 without the sheet main body 2 being deformed.

However, the adhesive force between the sheet main body 2 and the rupture band 3 is naturally much weaker than the tensile force of the sheet main body 2 alone, so when forming the container 4 from the sheet 1 by thermoforming. Considering the molding method, the structure of the container 4 to be molded, and the position of the rupture zone 3 in the container 4 to be molded, no tensile force is applied to the rupture zone 3 in the width direction of the rupture zone 3. It is necessary to do so.

For example, in the case of the illustrated embodiment, the break zone 3 is located across the center of the container 4, so that no tensile force is applied to the break zone 3 along its length when it is in its ripening state. However, almost no tensile force acts in one width direction.

〔Effect of the invention〕

As is clear from the above description, in the synthetic resin sheet according to the present invention, the adhesive force between the sheet main body and the breakable band can be set freely. , the optimum value can be set according to the purpose and conditions of use of the sheet, and the molding material for the rupture zone contains a material that cannot be bonded to the synthetic resin material used to form the main body of the sheet. Therefore, a large number of filamentous synthetic resin pieces are not generated on the peeled end surface of the sheet main body and the break zone, and the peel edge surface of the sheet main body can be made clean, and the adhesive strength between the sheet main body and the break zone can be improved. is determined according to the physical properties of the molding material, so even if the sheet is formed into a container by thermoforming, it will not be sorted or broken):
There is no problem that the adhesive strength between the two is strengthened.

In addition, when a sheet is formed into a container by thermoforming, the fracture zone is more difficult to deform than the main body of the sheet.
The thickness of the rupture zone tends to be slightly thicker than that of the rupture zone, and the separation of the rupture zone by the rupture zone becomes smoother and better. It is effective.

[Brief explanation of drawings]

FIG. 1 is an enlarged perspective view of essential parts of a synthetic resin sheet according to the present invention. FIG. 2 is a diagram showing an example of a container in an expanded state, which is cut from the sheet shown in FIG. 1 after being thermoformed. FIG. 3 is a perspective view of the entire assembly of the container shown in FIG. 2. Explanation of symbols 1: Sheet, 2: Sheet main body, 3: Breaking band, 4: Container,
5; Container body, 6; Container, 7; Attachment, 8; Joining flange, 9; Hinge, 1O; Knob piece. Applicant: Yoshino Kogyo Co., Ltd.

Claims (2)

[Claims] (1) A synthetic resin sheet formed by co-extrusion of a sheet main body and a thin strip-shaped breakage band dividing the sheet main body into left and right sides, wherein the breakage band is made of a molding material for the sheet main body. A certain first synthetic resin material, a second synthetic resin material that cannot be bonded to the first synthetic resin material, and a bondable bond between the second synthetic resin material and the first synthetic resin material. The sheet is molded using a mixed resin material of a third synthetic resin material to give softness to the molded fracture zone, and a fourth synthetic resin material to give softness to the molded fracture zone, and the melt index value of the fracture zone is The synthetic resin sheet is set to a value that is the same as or slightly lower than the melt index value of the sheet, and the softening temperature point of the fracture zone is set to a value that is the same as or slightly higher than the softening temperature point of the main body of the sheet. (2) A sheet main body and a thin strip-shaped break band dividing the sheet main body into left and right sides are integrally co-extruded to form a mold, and the break band is formed of a first synthetic resin that is the molding material of the sheet main body. material, and a second synthetic resin material that cannot be bonded to the first synthetic resin material.
the synthetic resin material, the second synthetic resin material, and the first synthetic resin material.
molded with a mixed resin material of a third synthetic resin material to enable adhesion to the synthetic resin material, and a fourth synthetic resin material to give softness to the molded breakage band, A composition in which the melt index value of the fracture zone is set to a value that is the same as or slightly lower than the melt index value of the sheet main body, and the softening temperature point of the fracture zone is set to a value that is the same as or slightly higher than the softening temperature point of the sheet main body. A sheet container formed by forming a resin sheet into a container main body of a desired shape by thermoforming means such as vacuum forming or pressure forming, and protruding from one end of the container main body with the end of the breaking band as a knob.