JPS5847986B2 - heat shrinkable packaging material - Google Patents

Description

[Detailed description of the invention] The present invention relates to a heat-shrinkable packaging material and a method for sealing the same.

Conventionally, packaging materials using heat-shrinkable film have been sealed using gassho pasting or tube pasting.

That is, the heat-shrinkable film 22 shown in FIGS. 1 and 2
A certain packaging material 21 is filled with the contents from a heat-shrinkable composite film made of a film 23 having a lower melting point than that of the film 23, and the contents are wrapped in a tight state by the packaging material by heat-shrinking. When pasting (Fig. 1) or cylinder pasting (Fig. 2), more force is applied to these sealing parts 24 than when using ordinary packaging materials, and sufficient sealing strength cannot be obtained with these two methods. There were no problems.

Therefore, in conventional heat-shrinkable composite film packaging materials, the seal width has necessarily been increased to compensate for the weak seal strength, resulting in a disadvantage that the appearance of the packaged product is impaired.

The present invention aims to solve the problems of sealing with conventional heat-shrinkable composite film packaging materials, and provides a heat-shrinkable composite film packaging material that provides a high-strength seal and a sealing method thereof. be.

The present invention provides a heat-sealable heat-shrinkable composite film packaging material wood body made by laminating a heat-shrinkable film and a heat-sealable film, and a heat-sealable heat-shrinkable wood body made by laminating a heat-shrinkable film and a heat-sealable film. and a composite film tape member, the end surfaces of the wrapping wood are butted together, and the wrapping wood is arranged so that the heat-sealable film surface of the tape member contacts the heat-sealable film surface of the area to be sealed around the abutted portion. This invention relates to a heat-shrinkable packaging material formed by overlapping each other only from the inside and thermally bonding their contact surfaces.

The heat-shrinkable composite film packaging material of the present invention will be specifically explained below with reference to the drawings.

FIG. 3 shows a sectional view when the packaging material of the present invention is used for packaging, and FIG. 4 shows a plan view thereof.

The packaging material of the present invention is a heat-sealable heat-shrinkable composite film made from a laminate of a heat-shrinkable film 2 and a heat-sealable film 3.
' and a heat-sealable film 3';
From.

These films 2, 2' and 3, 3' are also thermoplastic.

The films 2 and 2' may be made of the same material or different materials, but preferably they are made of the same material.

The same applies to films 3 and 3'.

The films 2 and 2' are heat-shrinkable, such as heat-shrinkable nylon, heat-shrinkable polyester, heat-shrinkable polypropylene, heat-shrinkable polyvinyl chloride, heat-shrinkable polyvinylidene chloride, heat-shrinkable polystyrene, heat-shrinkable Polyethylene, flame-shrinkable hydrochloric acid rubber, etc. are used.

Films 3 and 3' are made of a material having a lower melting point than film 2 or 2' and heat-sealable, such as polyethylene, polypropylene, Surlyn (Iomer), ethylene-vinyl acetate copolymer, polyvinyl chloride, polystyrene, and the like.

These films 2 and 3 and 2' and 3' can be laminated by, for example, extrusion lamination, dry lamination, or other means.

In the sealing method of the present invention, the heat-sealable film of the wooden wrapping material and the heat-sealable film of the tape are arranged so as to face each other and thermally bonded.

Specifically, as shown in FIG. 3, for example, the tape 5 is placed so that the heat-sealable film 3' faces upward (at this time, it may be placed on a support if necessary), and the packaging material is Fold the body 1 so that the tape 5 is wrapped around it, abut both end surfaces 6, 6, and apply the tape member to the heat-sealable film image (sealing area) 4 of the area to be sealed around the abutted portion. The heat-sealable film images 3' are stacked so as to be in contact with each other, and their contact surfaces are thermally bonded.

After filling with the contents to be packaged, the unsealed end 7 of the packaging material 1 may be ligated, for example, with a metal clip, or the heat-sealable films 3 inside the packaging material 1 may be thermally bonded together.

FIGS. 5 and 6 show a sectional view and a plan view of a package using a packaging material provided with a bottom seal, which is another embodiment of the packaging material of the present invention.

FIG. 5 is a sectional view taken along line P--P of the package shown in FIG. 6.

In FIGS. 5 and 6, parts corresponding to those in FIGS. 3 and 4 are given the same numbers.

In this embodiment, a bottom seal is provided between the bottom line 8 and the end 7 of the packaging material 1.

Therefore, in this case, the tape 5 is provided with heat-sealable films on both sides to enable double-sided sealing.

The tape seal of the packaging material of the present invention is made from a heat-shrinkable composite sheet in the sealing area 4 and the bottom sealing area 9 by at least one type of thermal bonding method such as a heat sealing method, an impulse sealing method, a high frequency welding method, an ultrasonic welding method, etc. The heat-sealable film 3 of the packaging material 1 and the heat-sealable film 3' of the heat-shrinkable composite film tape 5 are heat-sealed.

Since the packaging material according to the present invention is of a tape seal type, tearing force does not act as in the case of gassho seals, so that satisfactory sealing strength can be obtained.

In addition, conventional seals using heat-shrinkable composite films such as gassho-pasting or tube-pasting of packaging materials were not strong enough and the seal width was inevitably large, but with this tape sealing method, the seal can be sealed with a narrow seal width. It is possible.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view of a conventional packaging material pasted with the palms of hands together, and FIG. 2 is a cross-sectional view of a conventional packaging material pasted with cylinders. Figure 3 is a sectional view of the packaging material of the present invention, Figure 4 is a plan view thereof, and Figure 5 is Figure 6 of the packaging material provided with the bottom seal of the present invention.
6 is a sectional view taken along line -P, and FIG. 6 is a plan view thereof. In the figure, 1... Packaging material body, 2, 2'...
Heat-shrinkable film, 3,3'... Heat-sealable film, 4... Seal area, 5...
・Tape member, 6...End face of packaging material body, 9...
...Bottom seal area.

Claims (1)

[Claims] 1. A heat-sealable heat-shrinkable composite film that is made by laminating a heat-shrinkable film and a heat-sealable film. A heat-sealable heat-shrinkable composite film that is made by laminating a heat-shrinkable film and a heat-sealable film. and a tape member, abutting the end faces of the wooden packaging material, and applying only the inner side of the wooden packaging material so that the heat-sealable film surface of the tape member contacts the heat-sealable film surface of the area to be sealed around the abutted portion. A heat-shrinkable packaging material made by stacking two layers together and thermally bonding their contact surfaces.