JP2001019017A - Package body and heat shrinkable packaging material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To certainly and smoothly unseal along perforations a packaging material made of a heat-shrinkable label or a cap seal, etc., mounted on a container and to make a used packaging material easily recyclable. SOLUTION: For a package body which is made up in a structure wherein a packaging material 1 is formed of a cylindrical heat shrinkable film 10 which serves as a base and is mounted on a container 2 and while a pair of unsealing perforations 8a are provided at the packaging material in the direction crossing a primary shrinking direction of the film 10, the packaging material 1 mounted to the container 2 can be ruptured along the perforations 8a, a belt-like cutting tape 13 is stuck to the reverse side of the heat shrinkable film 10 on a position between the performations 8a, and the heat shrinkable film 10 is made of a polyester film in a birefringence of 0.01 to 0.10 and the cutting tape 13 is made of a polyester film in a birefringence of 0.030 to 0.100.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a package and a heat-shrinkable packaging material which are mounted on a container by heating a packaging material such as a heat-shrinkable label and a cap seal.

[0002]

2. Description of the Related Art Conventionally, the mouth of a container filled with a soft drink or the like is closed by a cap, and further, the mouth is wrapped so as to cover the cap in order to ensure safety and hermeticity. A cap seal as a material is attached.

This cap seal has a tubular heat-shrinkable film 50 as shown in FIG. 8, and a knob 51 is formed at the lower end thereof.
A perforation 53 of the strip is engraved in the vertical direction. Then, at the time of opening, by pulling the knob 51 and pulling it upward, the cap seal 5 is cut along the perforation 53.
5 is divided.

[0004]

However, if the cap seal is pulled by pulling the tab 51, the cap seal may be broken on the way and cannot be smoothly opened to the end. As a cause of this, since the cap seal 55 is usually made of the film 50 stretched in the lateral direction (circumferential direction), the cap seal 55 is easily torn in the lateral direction starting from the perforation 53 as shown in FIG.

[0005] The reason is considered that when the film is shrunk, the film is hardened, so that the film is likely to break in the lateral direction. In particular, the high shrinkage portion has a problem that the film is thick and hard, and hard in winter because of a large amount of shrinkage, so that the film cannot be smoothly torn along the perforations 53. In addition, as a material of the film, polyester resins are preferably used from the viewpoint of environmental problems and the like, and the use thereof is increasing. However, the problem that the perforations do not tear is remarkable. Moreover, the treatment and disposal of industrial waste has become a social problem today, and there is a demand for recycling of packaging materials (recycling of resources).

Accordingly, the present invention has been made to solve such a problem, and a packaging material comprising a heat-shrinkable label or a cap seal attached to a container can be reliably and smoothly placed along a perforation. An object of the present invention is to make it possible to open the package and to easily recycle used packaging materials.

[0007]

DISCLOSURE OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and a feature of the present invention as a package is that a tubular heat-shrinkable film 10 mounted on a container 2 is provided. Is used as a base material, and a pair of perforations 8a for opening are engraved on the packaging material 1 in a direction intersecting the main shrinkage direction of the film 10, and the perforations 8a are formed.
In the package body which is capable of breaking the packaging material 1 mounted on the container 2 along the line, the strip-shaped cut tape 13 is provided on the back surface of the heat-shrinkable film 10 and between the perforations 8a.
Is adhered, and the heat-shrinkable film 10 has a birefringence of 0.1.
The cut tape 13 is made of a polyester film having a birefringence of 0.030 to 0.10.
0 polyester film.

In the package, the packaging material 1 is heat-shrinked, but the heat-shrinkable film 10 has a birefringence of 0.1.
Since it is set to be from 0.1 to 0.10, the heat shrinkage becomes good, and the heat shrinkable film 10 adheres to the surface of the container 2.

In addition, the film 10 after shrinkage is not so brittle in the high shrinkage portion, and when the film 10 is broken through the band-shaped cut tape 13, the film 10 is moved in the circumferential direction which is the shrinkage direction. It becomes difficult to avoid carelessly and can be torn in the vertical direction along the perforations 8a.

Since the cut tape 13 is made of a polyester film having a birefringence of 0.030 to 0.100 for the purpose of making it difficult to stretch, the cut portion of the heat-shrinkable film 10 is not cut off halfway, Can be torn smoothly.

The perforation means a number of fine holes or cuts formed so as to penetrate the packaging material. The main shrinkage direction is the circumferential direction of the tubular heat-shrinkable film. Moreover, the birefringence is a value in a state before the heat shrinkage. Here, the birefringence is measured by attaching a compensator to a polarizing microscope and using a sodium D line as a light source, or by using a sodium D line light source using an Abbe refractometer and measuring a main contraction direction (circumferential direction). Direction), the refractive index in the orthogonal direction (vertical direction) intersecting with the refractive index in the perpendicular direction is measured separately, and the difference (the difference between the refractive index in the longitudinal direction and the refractive index in the width direction of the cut tape) is determined as the birefringence.

A feature of the heat-shrinkable packaging material is that the heat-shrinkable packaging material has a tubular heat-shrinkable film 10 that can be mounted on the container 2, and the film 10 has a pair of unsealing films in a direction intersecting the main shrinkage direction. In the heat-shrinkable wrapping material on which the perforations 8a are engraved, a band-shaped cut tape 13 is stuck on the back surface of the heat-shrinkable film 10 and between the perforations 8a. It is made of a polyester film having a refraction of 0.01 to 0.10.
No. 3 consists of a polyester film having a birefringence of 0.030 to 0.100.

[0013]

Embodiments of the present invention will be described below with reference to the drawings. 1 to 3 illustrate a heat-shrinkable labeled container according to an embodiment of the present invention. In such a container, a tubular heat-shrinkable label 1 as a packaging material is fitted over substantially the entire surface of the container 2.

The container 2 is made of a glass bottle, a plastic bottle or a metal, and has a body 3 having a substantially uniform diameter and a small-diameter mouth 4 provided on the upper part of the body 3. It has. A screw cap (closing body) 6 made of metal or plastic, for example, is detachably screwed to the mouth 4.

The heat-shrinkable label 1 has a thickness of 10 to 1
The heat-shrinkable polyester film 10 having a thickness of 00 μm (preferably 30 to 70 μm) made of, for example, polyethylene terephthalate or copolymerized polyester is used as a base material. The label 1 is formed on a film 10 such that a printed layer on which characters, patterns, and the like are printed is on the inside.
Are formed in a tubular shape by overlapping and joining both ends (not shown) of the. Note that the heat shrinkage of the polyester film 10 is preferably 50% or more in the main shrinkage direction (for example, a film that shrinks 50 to 75% in 5 seconds of hot water at 90 ° C.).

At the upper end 1a of the label 1, a knob 7 for opening a label formed by making a pair of cuts 11 is provided.
(Separation start part) is provided. A perforation 8 is engraved starting from the knob 7. The perforation 8 is formed by using the knob 7 as a starting point, the shoulder (mouth 4) of the container body 6.
A pair of (two) parallel vertical perforations 8a formed in the vicinity of the root portion of the container body 6 and horizontal perforations 8b formed in the circumferential direction of the container body 6. At the lower end of the vertical perforation 8a, a cut 9 is formed which is continuous with the horizontal perforation 8b.

The polyester film 10 has a birefringence of 0.01 to 0.10 (preferably 0.03 to 0.08).
It is. Here, the reason why the birefringence of the polyester film 10 is limited as described above is as follows.

That is, if the birefringence is less than 0.01, shrinkage becomes insufficient, and there is a possibility that the heat-shrinkable label 1 may be loosened at a site where high shrinkage is required when the label is attached to the container 2. If the birefringence is larger than 0.10, the film 10 itself after heat shrinkage becomes brittle, and the longitudinal perforations 8a
Tearing in the direction along the road (easy to run sideways).

On the back surface of the heat-shrinkable label 1 and between the vertical perforations 8a, a band-shaped cut tape 13 is applied over the entire length of the heat-shrinkable label 1 via a pressure-sensitive adhesive or a hot-melt adhesive. Is being worn. Cut tape 13
Is made of a PET tape having a base material of a biaxially oriented polyester film made of, for example, polyethylene terephthalate or copolymerized polyester. Also, cut tape 1
3 has a birefringence of 0.030 to 0.100 (preferably 0.
040 to 0.080), the width of the cut tape 13 is, for example, 2 to 5 mm, and the thickness of the film serving as the base material is preferably set to 10 to 20 μm. As the adhesive, it is preferable to use a rubber-based or acrylic pressure-sensitive adhesive. In the case of such an adhesive, the adhesive is applied to the surface of the base film by 3 to 10 μm.
Preferably, it is applied.

The reason for limiting the birefringence of the cut tape 13 as described above is as follows. That is, when the birefringence of the cut tape 13 is less than 0.030, the tape 13 is easily stretched and the opening becomes unstable. If the birefringence is larger than 0.100, the tape 13 is likely to shrink in the longitudinal direction (vertical direction) due to heating when the label 1 is shrunk, and both sides of the tape 13 are hardened and sink marks are easily caused. .

When forming the vertical perforations 8a, the horizontal perforations 8b and the cuts 9, the heat-shrinkable label 1 before heating is folded flat as shown in FIG. At this time, the cut tape 13 is positioned near the fold line 15 so as not to be positioned on the fold line 15, and the vertical perforations 8 a and the cuts 9 are formed on both the pieces 1 a and 1 b of the flat heat-shrinkable label 1. And the horizontal perforations 8b are formed. The perforation 8 has, for example, 0.5 to 2
mm, preferably 0.7 mm pitch.

In the container with a heat-shrinkable label having the above structure, a tubular heat-shrinkable label 1 is fitted on a container 2, and the heat-shrinkable label 1 is heated with hot air, an infrared heater, steam or the like, for example, a steam heater ( Heater for heating with steam and steam condensed with steam) at a temperature of about 80 ° C. to 90 ° C. for 5 seconds to
It is manufactured by being shrunk in the circumferential direction by heating for 15 seconds. At this time, the heat-shrinkable label 1 includes the entire side peripheral surface of the container body 5, the peripheral portion of the lower surface 5 a of the container body 5, and the closing body 6.
Is covered.

The label 1 of the package manufactured as described above
Is opened, the knob 7 formed on the upper end 1a of the heat-shrinkable label 1 is pulled down, and the vertical perforation 8a is opened.
After dividing the label 1 into two right and left along the horizontal perforation 8b
The upper part of the label 1 is cut off from the label 1 of the body part 3 along with and removed.

In this embodiment, the cut tape 13 is provided between the vertical perforations 8a to reinforce the broken portion, and the cut tape 13 has a birefringence of 0.030 to 0.10.
By setting the polyester film to 0, it is difficult to stretch, and the shrinkage due to heating at the time of mounting is small, so that the end of the tape 13 can be easily picked. Further, the polyester film 10 constituting the heat shrinkable label 1 includes:
By setting the birefringence to 0.01 to 0.10, the brittleness after shrinkage can be prevented, so that the polyester film 10 is easily broken in a direction perpendicular to the circumferential direction (orientation direction).

As a result, compared to the diameter of the body 3 of the container 2,
In the case where the diameter of the mouth 4 or the closing body 6 is small, the label shrinkage of the portion of the mouth 4 or the closing body 6 is large (for example, the shrinkage ratio is 50 to 70%), but the middle of the film 10 There is no breakage, and the film 10 can be reliably broken along the vertical perforations 8a and opened smoothly. Moreover, since the cut tape 13 is provided along the vertical perforations 8, the strength of the unsealed portion can be sufficiently ensured.

FIG. 4 shows a second embodiment of the present invention. That is, in the present embodiment, the shoulder (the mouth 4) of the container body 5 is used.
In the vicinity of the root portion of the label, a knob 7 (separation start portion) for opening the label formed by making a cut 18 is provided. A perforation 8 is engraved starting from the knob 7. The perforation 8 is composed of a pair of vertical perforations 8a cut from the knob 7 to the upper end of the film 10 to open the label 1 upward from the lower side, and a container body starting from the knob 7. 6 and a horizontal perforation 8b engraved in the circumferential direction.

Also in this configuration, the knob 7 is pulled up to divide the label 1 into two right and left along the vertical perforations 8a, and then the upper part of the label 1 is moved along the horizontal perforations 8b into the body 3 Separate from label 1 and remove.

The shape of the notch 18 is shown in FIGS.
Any shape such as a U-shape, trapezoidal shape, or triangular shape is possible as shown in (c), but a U-shape in which the tip of the knob 7 is rounded and curved is easy to pick and has a painful fingertip. It is preferable because it does not exist.

FIGS. 6 and 7 show a third embodiment of the present invention. That is, the cap seal 22 is shown as a packaging material, and the cap seal 22 is configured using a tubular heat-shrinkable film attached to the mouth 4 of the container 2 as a base material. The cap seal 22 includes a cylindrical cap seal main body 22a and an annular upper end portion 22b provided on an upper edge of the cap seal main body 22a, and a pair of vertical perforations 8a are formed in the vertical direction of the cap seal main body 25. It is formed in parallel over the entire length.

The knob 7 is provided with a cap seal body 25.
The cutting tape 13 is provided at the lower end of the knob 7 along the vertical perforation 8a.
a and the upper end portion 22b.

Then, as shown in FIG. 6, the tab 7 of the cap seal 22 attached to the mouth portion 4 of the container 2 is broken upward so that the heat-shrinkable cap seal 2 is broken.
2 can be opened. Note that the knob 7 may be provided at the upper end of the cap seal body 25 and be broken from above to below. Further, as the closing body 6, a crown (plug), a cork stopper, or the like is employed.

The present invention is not limited to the above embodiments, and one side of a pair of perforations is not limited to a single line and may be a plurality of lines. A plurality of cut tapes 13 can be provided in the circumferential direction of the packaging material. Further, any type and shape of the container 2 can be adopted.

[0033]

As described above, according to the present invention, a band-shaped cut tape is stuck on the back surface of the heat-shrinkable film and between the perforations, and the heat-shrinkable film has a birefringence of 0.0.
Consisting of a polyester film of 1 to 0.10, and
Since the cut tape is made of a polyester film with a birefringence of 0.030 to 0.100, even if the film is highly shrunk, the heat-shrinkable packaging material can be reliably and smoothly opened along the perforations. It has the effect of being able to.

Moreover, since the heat-shrinkable film and the cut tape are made of a polyester film of the same material, it is possible to easily recycle resources such as manufacturing a recycled product from a used packaging material. There are advantages.

[Brief description of the drawings]

FIG. 1 is an overall perspective view of a package including a partial cross section showing a first embodiment of the present invention.

FIG. 2 is a perspective view of a main part including a partial cross section in a state where the packaging material is opened.

FIG. 3A is a perspective view of a packaging material before shrinkage, and FIG. 3B is a front view showing the main part.

FIG. 4 is an overall front view of a package including a partial cross section showing a second embodiment of the present invention.

5 (a) to 5 (c) are front views each showing a cutting state of a packaging material.

FIG. 6 is an overall perspective view showing a third embodiment of the present invention.

FIG. 7 is a perspective view showing a cap seal of the present invention.

FIG. 8 is a perspective view showing a conventional example.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Heat-shrinkable label (packaging material), 2 ... Container, 8a ... Vertical perforation (perforation), 10 ... Heat-shrinkable film, 13 ...
Cut tape, 22 ... Cap seal (packaging material)

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Tetsuo Hata 5-3-1-18 Imazukita, Tsurumi-ku, Osaka-shi Inside Fuji Seal Co., Ltd. (72) Inventor Makoto Fukuhara 5-3-1-18 Imakita, Tsurumi-ku, Osaka-shi Stock Association F term in Fuji Seal (reference) 3E084 AA04 AA12 AA22 AA24 AA32 AB01 BA03 BA08 CA01 CB01 CB04 CC01 CC03 DA01 DB01 DB12 DC03 FA09 FB01 FD09 GA04 GB04 GB08 GB17

Claims (2)

[Claims] 1. A packaging material (1) is constituted by using a tubular heat-shrinkable film (10) mounted on a container (2) as a base material, and the packaging material (1) includes the film (10). The pair of perforations (8
a) is engraved, and the packaging material (1) attached to the container (2) can be broken along the perforations (8a). A band-shaped cut tape (13) is adhered between the perforations (8a), and the heat-shrinkable film (10) is made of a polyester film having a birefringence of 0.01 to 0.10. Tape (13) has a birefringence of 0.0
A package comprising a polyester film of 30 to 0.100. 2. A tubular heat-shrinkable film (10) attachable to the container (2), wherein the film (10) has a pair of perforations for opening in a direction intersecting the main shrinkage direction. In the heat-shrinkable packaging material engraved with (8a), the back surface of the heat-shrinkable film (10) and a perforation (8a)
Between them, a band-shaped cut tape (13) is adhered, and the heat-shrinkable film (10) has a birefringence of 0.01 to 0.1.
A heat-shrinkable packaging material comprising a polyester film having a birefringence of 0.030 to 0.100 and a cut tape (13).