JP2002029514A - Heat shrinking cylindrical label and its manufacturing method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To overcome a substantial problem in quality control in a manufacturing process for a heat shrinking cylindrical label of polyolefin-type film of its specific gravity lower than 1 having sealed at its central part with adhesive in which setting of the adhesive takes much time even if some broken or crushed segments of the label and PET bottle can be separated with water when the PET bottle is recycled. SOLUTION: Either a single layer or multi-layer type heat shrinking film 2 made of polyolefin film-type resin having a specific weight of lower than 1 or a heat shrinking film 2 of multi-layer film made of polyolefin-type resin and polystylene-type resin having a specific weight of lower than 1 is made into a cylindrical shape, a fusible seal segment 3 is formed by a longitudinal melt cutting seal at the cylindrical film, the fusible seal segment 3 is provided with an easy-opening seal part 5 such as a V-shaped notch or the like to make a heat shrinking cylindrical label 1.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat-shrinkable cylindrical label attached to a polyethylene terephthalate bottle (hereinafter abbreviated as a PET bottle).
In the regeneration step of obtaining recycled flakes or pellets from used PET bottles when recycling the T bottle,
The improved ET bottle and the heat-shrinkable tubular label can be easily separated.

[0002]

2. Description of the Related Art Recycling of PET bottles has been activated due to the enforcement of the Containers and Packaging Recycling Law. As a recycling method, a method of collecting used PET bottles, washing and sterilizing the collected PET bottles, and reusing them can be considered.
A method of obtaining flakes of recycled PET (polyethylene terephthalate) or pellets of recycled PET from a T bottle is employed. Hereinafter, the outline of this step will be described.

A collected PET bottle (usually in a state of being provided with a plastic or aluminum cap and a heat-shrinkable cylindrical label) is manually inspected by a weight separator, X-ray inspection, or the like, and then subjected to glass bottles, metal cans, chlorides, etc. Sorted from containers such as vinyl bottles. Next, the PET bottle is crushed into small pieces of several mm to 10 mm square with the heat-shrinkable tubular label attached. Next, the pulverized strip is separated and removed by a specific gravity separator from a heat-shrinkable cylindrical label having a specific gravity of less than 1 and a pulverized body of a heat-shrinkable cylindrical label having a specific gravity of 1 or more is subjected to wind power. Removed by the separator. Further, when an aluminum cap is used, the pulverized body of the aluminum cap is removed by the aluminum separator to obtain a pulverized body of PET. The obtained pulverized PET is regenerated into PET flakes or PET pellets by a known method.

The above-mentioned specific gravity separator is a method in which a pulverized body of a PET bottle and a heat-shrinkable cylindrical label is put in water, and a pulverized body of a heat-shrinkable cylindrical label having a specific gravity of less than 1 is floated on water, and is then placed in water. It is a device that separates the crushed PET bottle from the crushed material, and the wind separator is a device that spreads the crushed material on a mesh,
This is a device that blows air from below to blow off pulverized heat-shrinkable cylindrical labels. Therefore, the specific gravity separator has an excellent ability to separate PET and heat-shrinkable labels, and also has a large processing ability per unit time. On the other hand, the wind separator has a poor ability to separate PET and heat-shrinkable labels, and has a small processing capacity. Therefore, a heat-shrinkable cylindrical label made of a material that can be separated from PET by a specific gravity separator, that is, a specific gravity of 1
There is a need for less heat shrinkable tubular labels.

Conventionally, as a heat-shrinkable tubular label made of a polystyrene resin or a polyester resin, a heat-shrinkable film made of a polystyrene-based resin or a polyester-based resin is produced, and one side of the heat-shrinkable film is gravure. After printing a pattern and characters by printing or the like, the heat-shrinkable film for label is produced in a roll by slitting it to a predetermined width. Next, the heat-shrinkable film for labels is formed such that the printing surface is on the inside, the longitudinal direction of the film is the longitudinal direction, and the width direction is the circumferential direction, and the solvent is applied to one end of the film. Is applied and adhered with an envelope to produce a long tubular material (hereinafter, attaching a film with an envelope is referred to as a center seal). Next, this long tubular material is cut into a predetermined length to obtain a heat-shrinkable tubular label. The obtained heat-shrinkable cylindrical label is attached to a PET bottle filled with the contents, and the cylindrical label is shrunk by heating and closely adhered to the PET bottle to obtain a PET bottle product decorated with the cylindrical label.

On the other hand, when a heat-shrinkable tubular label is produced using a heat-shrinkable film made of a polyethylene or polypropylene resin, polyolefin resins such as polyethylene and polypropylene have excellent solvent resistance.
It is impossible to seal the center using a solvent.
Therefore, when producing a heat-shrinkable cylindrical label using a polyolefin-based film, a corona discharge treatment is performed on the side opposite to the printing surface, and the surface is sealed with a urethane-based adhesive or the like. Also, the center seal may be performed by an ultrasonic seal.

[0007]

As described above,
A heat-shrinkable cylindrical label using a polystyrene-based resin or a polyester-based resin has a problem in the processing capacity in the regeneration step, because it cannot be separated by water using a specific gravity separator when regenerating a PET bottle. On the other hand, a heat-shrinkable cylindrical label in which a center is sealed with an adhesive using a polyolefin resin such as polyethylene or polypropylene has a problem in quality control in terms of unevenness in application of the adhesive. When an adhesive is used, if the amount of the applied adhesive is increased to stabilize the adhesive force, the specific gravity of the label becomes close to 1 or more than 1, and the label cannot be separated using a specific gravity separator. In general, resins such as polyethylene (hereinafter abbreviated as PE), polypropylene (hereinafter abbreviated as PP), polystyrene (hereinafter abbreviated as PS), and polyethylene terephthalate (hereinafter abbreviated as PET) have a density of [g / cm ³ ]. Although it will be described in the specification of the present invention that these resins are separated by using a specific gravity separator, hereinafter, they will be expressed by specific gravity instead of density.

When the center seal is performed using an adhesive, it is necessary to perform a corona discharge treatment on the polyolefin film, so that the number of production steps increases, and at the same time, the adhesive is completely cured to obtain a predetermined adhesive force. Up to 12 hours, usually about 24 hours. That is,
Whether the center seal has the specified adhesive strength
This is a major problem in quality control because it cannot be confirmed until after 24 hours. Furthermore, since the adhesive does not have heat shrinkage, when the obtained tubular label is attached to a container and heat shrunk, the sealing strength of the center seal portion is reduced. For this reason, when the bottle is hot-filled with the contents, or after the bottle is subjected to a heat treatment such as a boil treatment or a retort treatment, the center seal portion is likely to peel off.

A heat-shrinkable cylindrical label in which a center seal is performed by ultrasonic sealing or heat sealing using a polyolefin-based film has a low processing speed and leads to an increase in production cost. In case of ultrasonic seal, processing speed is 30 ~
It is about 50 m / min, and there is a drawback that the seal portion is wavy and the appearance is poor.

On the other hand, in order to separate the PET bottle and the heat-shrinkable tubular label by hand, a method is provided in which one or two perforations are provided in the longitudinal direction of the tubular label, and the label is separated from the perforation by tearing the perforation. Is adopted. However, perforations tend to cause poor tearing, which is a major problem.
In particular, when the label is a PET film, the tearing property in the horizontal direction is good, but the tearing property in the vertical direction is poor. Therefore, a heat-shrinkable tubular label provided with perforations in the vertical direction is apt to cause tearing failure. Further, depending on the shape of the container, the size of the perforation differs when the cylindrical label is shrunk, which may cause a problem in appearance.

[0011]

In order to solve the above problems, the structure of a heat-shrinkable tubular label and the method of manufacturing the same are as follows. In a heat-shrinkable tubular label in which a heat-shrinkable film is formed in a tubular shape, the heat-shrinkable film has a specific gravity of 1
Less than a single-layer or multilayer thermoplastic resin film,
The heat-shrinkable cylindrical label is characterized in that the seal portion formed in the vertical direction of the cylindrical label is formed by a fusing seal.

The heat-shrinkable film is a film made of an olefin resin having a specific gravity of 0.96 or less, or a multilayer film of a polyolefin resin and a styrene resin (or a polyester resin),
A heat-shrinkable tubular label having a specific gravity of 0.96 or less was obtained. Further, the strength of the fusing seal formed by the fusing seal can be easily changed by hand in the lateral direction (left and right).
A heat-shrinkable cylindrical label having a strength that can be opened at a time, or a cut-out for tearing or a thick portion that is easy to be picked by a finger is provided in the fusing seal portion, or a tearing tape is adhered to form a fusing seal. The heat-shrinkable cylindrical label is characterized in that the portion can be easily opened in the vertical direction by hand. The heat-shrinkable cylindrical label is a label attached to a polyethylene terephthalate bottle, and when the polyethylene terephthalate bottle is regenerated, a crushed product of the polyethylene terephthalate bottle and the heat-shrinkable cylindrical label is water-diffused due to a difference in density. The heat-shrinkable cylindrical label was characterized in that the label could be separated by the above method.

The method for producing the heat-shrinkable cylindrical label is as follows. That is, a heat-shrinkable film made of a single-layer or multi-layer thermoplastic resin film having a specific gravity of less than 1 is formed into a cylindrical shape, and a seal portion is formed by a fusing seal in a longitudinal direction of the cylindrical film to form a cylindrical label. The method for producing a heat-shrinkable cylindrical label characterized by the above. Further, a method of manufacturing a heat-shrinkable cylindrical label, characterized in that the strength of the fusing seal portion formed by the fusing seal is set to a strength that can be easily opened by hand in the lateral direction (left and right). Alternatively, the fusing seal portion may be formed with a cut-out for tearing or a thick portion that is easy to be picked with a finger, or by bonding a tearing tape so that the fusing seal portion can be easily opened by hand in the vertical direction. Thus, a method for producing a heat-shrinkable tubular label is provided.

Further, two heat-shrinkable tubular films are used to form a heat-shrinkable cylindrical label by providing two fusing seal portions, and tear cuts are made in the two fusing seal portions. A method for manufacturing a heat-shrinkable tubular label, wherein the heat-sealing seal portion can be easily opened by hand in the vertical direction. Further, a heat-shrinkable film made of a single-layer or multilayer thermoplastic resin film is wound around a package (for example, a PET bottle) to form a tube, and both ends of the heat-shrinkable film formed into a tube are sealed by fusing. By forming a fusing seal portion to form a heat-shrinkable tubular label of the package, and then providing a cut for tearing in the fusing seal portion, the heat-shrinkable tubular label can be manually handed vertically from the fusing seal portion. A method for producing a heat-shrinkable tubular label, characterized in that the label can be easily opened.

That is, the heat-shrinkable cylindrical label of the present invention can be easily separated by a specific gravity separator using water when recycling a used PET bottle. In order to do so, a heat-shrinkable tubular label is made to float on water using a polyolefin single-layer or multilayer film having a specific gravity of less than 1. When a laminated film of a polyolefin-based resin and a polystyrene-based resin (or a polyester-based resin) is used, the specific gravity of the laminated film is set to less than 1 so that the PET film can be separated from the pulverized body by water. Things.

Therefore, as the polyolefin resin, a polymer or copolymer of polyethylene, polypropylene and α-olefin having a specific gravity of 0.96 or less is used. In particular, polyethylene or polypropylene having a specific gravity of 0.94 or less, preferably 0.92 or less is preferable. When a laminated film of a polyolefin-based resin and a polystyrene-based resin (or a polyester-based resin) is used, if the specific gravity of the laminated film is set to less than 1, PET with water is used.
Although it can be separated from the crushed body of the bottle, the specific gravity of the laminated film must be 0.9 for efficient separation with water using a specific gravity separator.
It must be 6 or less.

Next, the heat-shrinkable cylindrical label of the present invention is formed by fusing the center seal portion of the cylindrical label so that the heat-shrinkable cylindrical label can be easily separated from the used PET bottle by hand. The sealing strength was weakened so that when the fusing seal portion was pulled in the lateral direction by hand, the fusing seal portion could be easily broken. In addition, a thick portion which is easy to pick with a finger for facilitating tearing, a V-shaped notch or U-shaped notch for tearing, and a tearing tape are adhered to the fusing seal portion, and the tearing tape is used. This facilitates tearing. Alternatively, the heat-shrinkable tubular label is provided with two fusing seal portions, and the two fusing seal portions are provided with tear cuts so that the heat-shrinkable tubular label can be easily separated from the PET bottle by hand. Things. The heat-shrinkable cylindrical label of the present invention can be used for plastic bottles other than PET bottles, such as polyvinyl chloride bottles, and glass bottles.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail with reference to the drawings. FIG. 1 is a perspective view showing an example of the heat-shrinkable tubular label of the present invention. 2 and 3 are front views when the heat-shrinkable tubular label of the present invention is mounted on a PET bottle. FIG. 4 is a view showing various forms of the easy-opening portion provided in the fusing seal portion of the heat-shrinkable tubular label of the present invention. FIG. 5 is an explanatory view when a heat-shrinkable tubular label is produced by forming one heat-sealing seal portion from one heat-shrinkable film, and FIG. 6 is a view illustrating the heat-sealing seal portion from two heat-shrinkable films. FIG. 3 is an explanatory view when a heat-shrinkable cylindrical label is formed by forming the heat-shrinkable tubular label at two locations.

FIG. 7 is an explanatory diagram for producing a heat-shrinkable tubular label continuously from one heat-shrinkable film.
FIG. 8 is an explanatory diagram when one heat-shrinkable film is wound around a PET bottle to produce a heat-shrinkable tubular label. FIG. 9 is an explanatory diagram for producing a heat-shrinkable tubular label according to Example 1, and FIG. 10 is an explanatory diagram for producing a heat-shrinkable tubular label according to Example 2. FIG. 11 is a schematic diagram of a heat-shrinkable cylindrical label produced according to Example 3. FIG. 12 is an explanatory diagram for producing a heat-shrinkable tubular label according to Example 4, and FIG. 13 is an explanatory diagram for producing a heat-shrinkable tubular label according to Example 5.

As shown in FIG. 1, the heat-shrinkable cylindrical label 1 of the present invention basically has a heat-shrinkable film 2 having a specific gravity of less than 1 and a fusing seal portion 3 formed by a fusing-sealing method. The heat-shrinkable label 2 is provided in such a manner that the fusing seal portion 3 is provided with an easy-opening portion 5 such as a cut for tearing so that the heat-shrinkable label 2 can be easily removed from a used PET bottle or the like by hand. It is. Further, the sealing strength of the fusing seal portion 3 of the heat-shrinkable tubular label 1 is weakened so that the fusing seal portion 3 can be easily opened by hand.

The heat-shrinkable cylindrical label of the present invention is attached to a PET bottle containing contents, and the heat-shrinkable cylindrical label is shrunk by heating to adhere to the PET bottle to obtain a product. When collecting and recycling bottles,
As shown in FIG. 2, the heat-shrinkable cylindrical label 1 is torn by hand so that the PET bottle 4 and the heat-shrinkable cylindrical label 1 can be easily separated. That is, as shown in FIG. 2, the heat-shrinkable tubular label 1 attached to the PET bottle 4
By tearing the heat-shrinkable cylindrical label by hand in the longitudinal direction (the direction of the arrow) using the easy-opening portion 5 (cutting for tearing or bonding of a tearing tape) provided on the fusing seal portion 3, Heat shrinkable cylindrical label 1 easily from PET bottle
Can be removed.

When the strength of the fusing seal portion 3 of the heat-shrinkable tubular label 1 is weakened, as shown in FIG. 3, the fusing seal portion 3 is manually moved as indicated by an arrow. Then, the heat-shrinkable tubular label 1 can be removed from the PET bottle 4 by breaking the fusing seal portion 3 by pulling in the lateral direction (left and right). The sealing strength of the fusing seal portion 3 can be adjusted by changing the thickness of the heat-shrinkable tubular label 1. For example, when a heat-shrinkable film made of polyethylene or polypropylene is used, the thickness is 30 to In the range of 60 μm, the fusing seal portion 3 of the heat-shrinkable tubular label 1 can be torn by hand in the lateral direction (left and right).

Further, the heat-shrinkable tubular label 1 of the present invention comprises:
A single-layer or multi-layer film made of a polyolefin resin such as polyethylene or polypropylene, or a multi-layer film made of a polyolefin resin and a polystyrene resin (or a polyester resin), and printing ink on the single-layer or multi-layer film After printing pictures and characters using, the specific gravity of the entire printed film is 0.9
6 or less, even if the PET bottle 4 with the heat-shrinkable cylindrical label 1 attached is crushed as it is to obtain a crushed body, the crushed body of the heat-shrinkable cylindrical label 1 is immersed in water. Since it floats, it can be efficiently separated from the ground PET bottle 4 having a specific gravity of 1.3 to 1.4 with water using a specific gravity separator.

As described above, the heat-shrinkable cylindrical label 1 of the present invention can be easily opened such as a cut for tearing the fusing seal portion 3 in order to remove the heat-shrinkable cylindrical label 1 from the PET bottle by hand. A part 5 is provided. Hereinafter, various shapes used as the easy-open portion will be described. As a general example of the easy-opening portion, as shown in FIG.
There is. The V-shaped notch 5a is provided at the upper or lower part of the fusing seal portion 3 of the heat-shrinkable tubular label 1, and as described above, the heat-shrinkable tubular label 1 is formed using the V-shaped notch 5a. Tear by hand in the vertical direction (the direction of the arrow in FIG. 2),
It is for removing from the PET bottle. As another shape of the V-shaped notch 5a, a known U-shaped notch, an I-shaped notch, or the like can be used. In addition, the notch is generally provided on one side of the fusing seal portion 3 of the heat-shrinkable label 1, but may be provided on both the upper part and the lower part.

Further, as shown in FIG. 4 (b), a knob 5b which is easy to be picked by a finger is provided on the upper part of the fusing seal portion 3, and the knob 5b is picked by a finger so that the heat-shrinkable label 1 is hand-operated in the vertical direction. Can also be torn. The knob 5b can be formed by forming a thick portion of the film on the upper part of the fusing seal part 3 when the heat-shrinkable cylindrical label 1 is produced by the fusing seal. Further, as shown in FIG.
A thick portion 5c may be formed on the upper part of the label, and the thick portion 5c may be pinched with a finger to tear the heat-shrinkable label 1 in the vertical direction by hand.

Next, as shown in FIG. 4D, the tear tape 5d is bonded to the vicinity of the fusing seal portion 3 of the heat-shrinkable tubular label 1 by using an adhesive, so that the tear tape 5d is attached. The heat-shrinkable cylindrical label 1 can be easily torn by hand in the vertical direction as shown by the arrow. Various known tearing tapes can be used as the tearing tape.

As shown in FIG. 4E, when producing the heat-shrinkable tubular label 1 using two heat-shrinkable films, two fusing seal portions 3 are provided. The heat-shrinkable cylindrical label 1 can be easily torn by hand in the vertical direction (the direction of the arrow) by using the cut 5e provided in the upper portion of the fusing seal portion 3 of FIG. In this case, by pulling the heat-shrinkable tubular label 1 left and right by hand, the heat-shrinkable label 1 is torn in the longitudinal direction from the two fusing seal portions 3.

Further, as a method for removing the heat-shrinkable cylindrical label attached to the PET bottle, when the heat-shrinkable cylindrical label 1 is manufactured using a heat-shrinkable film, the strength of the fusing seal portion is reduced. As shown in FIG. 3, the heat-shrinkable tubular label 1 can be removed from the PET bottle by pulling the heat-shrinkable tubular label 1 left and right by hand to break the fusing seal portion 3. The seal strength in the lateral direction of the fusing seal portion is, for example, 2 kgf when measured at a seal width of 15 mm and a tensile speed of 200 mm / min.
If it is / 15 mm or less, it can be torn by hand. On the other hand, when a perforation is provided as an easy-opening part,
Under the same conditions, the weight is about 3.4 kgf / 15 mm, and it is difficult to tear left and right by hand. Therefore, the strength of the fusing seal portion is 2 kgf / 15 mm or less, preferably 1-2 kgf.
f / 15mm is better. The strength of the fusing seal is 1
If the weight is less than kgf / 15 mm, a trouble in which the fusing seal portion is broken occurs in the production process of the heat-shrinkable cylindrical label and the process of mounting the PET label on the PET bottle, and the work efficiency is reduced.

The method for producing the heat-shrinkable cylindrical label of the present invention will be described below. First, as a heat-shrinkable film having a specific gravity of less than 1, a uniaxially stretched film such as polyethylene or polypropylene (usually a transversely uniaxially stretched film) is used. To produce a printed film. The thickness of the film is used in the range of 30 to 120 μm. Next, the printed uniaxially stretched film is cut into a predetermined size to obtain a heat-shrinkable film 2 which is heat-shrinked in a lateral direction as shown in FIG. Hereinafter, the heat-shrinkable film 2
Denotes a sheet that has been subjected to predetermined printing and thermally contracted in the horizontal direction. Although biaxially stretched films can be used, it is very difficult to print with a pre-corrected design in order to eliminate the distortion of pictures and characters caused by heat shrinkage. Film is often used.

Next, as shown in FIG. 5 (b), the heat-shrinkable film 2 is formed into a tubular shape with the printing surface inside, and both ends of the heat-shrinkable film 2 are blow-sealed by a blow-sealing method. Is formed to produce the heat-shrinkable tubular label 1. Next, as described above, when the easy-opening portion is provided, the easy-opening portion as shown in FIGS. However, as described above, if the strength of the fusing seal portion 3 is weakened and it is opened in the lateral direction, the fusing seal portion 3
Just keep on forming. Heat shrinkable film thickness is 30 ~
In the case of 60 μm, the sealing strength in the shearing direction of the fusing seal portion 3 can be set to “2 kgf / 15 mm width” or less, so that the heat-shrinkable tubular label 1 can be torn to the left and right by hand. Therefore, the thickness of the heat shrinkable film is 60 μm.
If it exceeds m, it is difficult to tear the fusing seal portion 3 by hand, so that an easy-opening portion such as a V-shaped notch must be formed.

Further, the heat-shrinkable tubular label of the present invention can be manufactured by using two heat-shrinkable films having a specific gravity of less than 1. That is, as shown in FIG. 6 (a), two heat-shrinkable films 2 each having a pattern, characters and the like printed on the back surface.
6 so that the printing surfaces are on the inside of each other, and the two ends of the two heat-shrinkable films 2 are
As shown in (b), a fusing seal portion 3 is formed by a fusing sealing method to produce a heat-shrinkable tubular label 1. In this case, as in the above case, the sealing strength of the fusing seal portion 3 is “2”.
kgf / 15 mm width "or less, the heat-shrinkable tubular label 1 can be torn in the lateral direction (left and right) by hand,
When the seal strength exceeds “2 kgf / 15 mm width”, as shown in FIG. 4 (e), a cut 5 e is provided in the fusing seal portion 3, and the heat-shrinkable tubular label 1 is easily torn in the vertical direction by hand. To do.

Further, since the heat-shrinkable tubular label of the present invention can be manufactured continuously by using a heat-shrinkable film having a specific gravity of less than 1, the manufacturing method will be described below.
The heat-shrinkable film 2 on which a pattern and characters are printed on the back side is unwound from the winding, and as shown in FIG. As shown in FIG. 7B, the both ends of the conductive film 2 are continuously formed by a fusing seal method to form a long tubular film, and then the tubular film is removed. The heat-shrinkable tubular label 1 is cut to a predetermined size from the cutting line 6. Also in this case, similarly to the above, the fusing seal portion 3 may or may not be provided with an easy-opening portion. When the fusing seal portion 3 is provided with a V-shaped notch 5a as shown in FIG. 4A, the V-shaped notch 5a may be provided simultaneously with the cutting when cutting the tubular film from the cutting line 6. it can. Further, as shown in FIG. 4D, when the tearing tape 5d is adhered, the heat-shrinkable film 2
When a fusing seal portion 3 is provided to form a tubular shape, the tearing tape 5d is continuously adhered using an adhesive, and then the tubular film is cut into a predetermined size to form a heat-shrinkable tubular label. Prepare No. 1.

Next, the case where the heat-shrinkable film 2 is directly wound around the PET bottle 4 to form the heat-shrinkable tubular label 1 will be described. As shown in FIG. 8A, the heat-shrinkable film 2 cut into a predetermined size is wound around a PET bottle 4 filled with the contents with the printing surface inside as shown in FIG. 8B. At the same time, as shown in FIG. 8C, both ends of the heat-shrinkable film 2 are formed into a tubular shape by forming a fusing seal portion 3 by a fusing-sealing method, and the heat-shrinkable tubular label 1 is formed on a PET bottle 4. Installing. Also in this case, after the fusing seal portion 3 is formed by the fusing sealing method, the easy-opening portion such as the above-described V-shaped notch can be formed.
Thereafter, the heat-shrinkable tubular label 1 attached to the PET bottle 4 is heated by a heating device and shrinks by heat, and firmly adheres to the PET bottle 4 to form a PET bottle product with the heat-shrinkable tubular label 1 attached.

Further, instead of using the heat-shrinkable film 2 cut to a predetermined size as described above, the heat-shrinkable film is unwound continuously from winding and wound around a PET bottle 4 in the same manner as described above. The heat-shrinkable cylindrical label 1 can be formed by fusing and sealing. Further, the heat-shrinkable cylindrical label 1 can be attached to the PET bottle 4 in the same manner using two heat-shrinkable films.

[0035]

Hereinafter, the present invention will be described in more detail with reference to examples. (Example 1) Uniaxially stretched film of linear low-density polyethylene (hereinafter abbreviated as LLDPE) having a specific gravity of 0.92 (thickness: 50 μm, lateral heat shrinkage in an automatic hot water control water bath: 30 ° C. at 80 ° C.) %, 49% at 95 ° C.) to print a pattern and characters on the back surface by gravure printing to produce a rolled print film. Next, the print film was cut into a size of 70 mm long × 210 mm wide, and as shown in FIG.
E film 2a was obtained. Next, as shown in FIG. 9 (b), the heat-shrinkable LLDPE film 2a is folded in two with the printing surface inside, and both ends of the folded heat-shrinkable film 2 are blow-sealed by a blow-sealing method. Part 3
Then, as shown in FIG. 9C, a heat-shrinkable cylindrical label 1 having a length of 70 mm and a folding diameter of 103 mm was produced.

The horizontal sealing strength of the fusing seal portion 3 of the heat-shrinkable tubular label 1 is 1.96 kgf / 15 mm.
It was width. The seal strength is determined by cutting a heat-shrinkable cylindrical label including a fusing seal portion into a width of 15 mm to form a test piece, and using the test piece with a tensile tester (Orientec Co., Ltd.)
Tensilon) at a speed of 200 mm / min, and the strength was measured.

Next, the heat-shrinkable cylindrical label 1 was mounted on a 500 ml PET bottle filled with tea, and then heated at 80 ° C. for 5 seconds using a wet-type shrink tunnel. After shrinking, the heat-shrinkable cylindrical label 1 was brought into close contact with the PET bottle 4 as shown in FIG. The heat-shrinkable cylindrical label 1 was tightly adhered to the PET bottle 4, and no wrinkle, vertical shrinkage, whitening, distortion of the picture, and the like were observed on the heat-shrinkable cylindrical label 1. Further, even if the PET bottle 4 on which the heat-shrinkable tubular label 1 is mounted is dropped from a height of 1 m, the heat-shrinkable tubular label 1 is broken and the P
There was no detachment from the ET bottle 4. Furthermore, PE
When the fusing seal portion 3 of the heat-shrinkable tubular label 1 attached to the T bottle 4 is pulled by hand in the lateral direction (the direction of the arrow in FIG. 9D), the fusing seal portion 3 is broken, and the heat-shrinkable tube is broken. The label 1 could be easily removed from the PET bottle 4.

(Example 2) Uniaxially stretched film of high-density polyethylene having a specific gravity of 0.95 (hereinafter abbreviated as HDPE) (thickness: 70 μm, heat shrinkage in a horizontal direction in an automatic hot water controlled water bath: 80 ° C., 32 ° C.) %, 57% at 95 ° C.), and gravure printing was performed on the back surface in the same manner as in Example 1 to produce a rolled print film. Then, Example 1
In the same manner as above, the printing film is 70 mm long × 210 m wide.
Then, as shown in FIG. 10A, a heat-shrinkable HDPE film 2b was obtained.

Next, as in Example 1, the heat shrinkage H
A fusing seal portion 3 is formed at both ends of the DPE film 2b by a fusing sealing method, and as shown in FIG.
A heat-shrinkable cylindrical label 1 having a diameter of 0 mm and a folding diameter of 103 mm was produced. Further, when forming the fusing seal portion 3, FIG.
As shown in (c), the fusing seal portion 3 was provided with a thick portion 5c so as to be easily opened by hand. Fusing seal part 3 at this time
Was measured by the tensile tester used in Example 1 to find that the seal strength was 0.105.
kgf. The seal strength in the vertical direction is determined by setting the film including the fusing seal portion 3 of the heat-shrinkable tubular label 1 in the vertical direction.
A test piece was cut by 5 mm width, one end of the test piece was fixed to a chuck of a tensile tester, and the thick portion 5c of the fusing seal portion was fixed to the other chuck (moving chuck), and the pulling speed was changed. The moving chuck was moved downward at 200 mm / min, and the strength at which the fusing seal portion was broken was measured.

Next, the heat-shrinkable cylindrical label 1 was mounted on a 500 ml PET bottle filled with tea and heat-shrinked in a shrink tunnel as in Example 1, and the heat-shrinkable cylindrical label 1 was placed on the PET bottle 4. Label 1 was adhered. The heat-shrinkable cylindrical label 1 was tightly adhered to the PET bottle 4, and no wrinkle, vertical shrinkage, whitening, distortion of the picture, and the like were observed on the heat-shrinkable cylindrical label 1. In addition, the heat-shrinkable cylindrical label 1
The heat-shrinkable cylindrical label 1 was not broken and was not detached from the PET bottle 4 even when the PET bottle 4 equipped with was dropped from a height of 1 m. Further, the thick portion 5c of the fusing seal portion 3 of the heat-shrinkable tubular label 1 attached to the PET bottle 4.
Was cut by hand and teared in the vertical direction, the fusing seal portion 3 was broken, and the heat-shrinkable cylindrical label 1 could be easily removed from the PET bottle 4.

Example 3 As in Example 2, HDPE
As shown in FIG. 10A, a heat-shrinkable HDPE film 2b was produced using the uniaxially stretched film. Then, similarly to Example 1, the both ends of the heat-shrinkable HDPE film 2b are formed with a fusing seal portion 3 by a fusing-sealing method, and as shown in FIG. A flexible tubular label 1 was produced. Furthermore,
After forming the fusing seal part 3, as shown in FIG. 11, a V-shaped notch 5a was provided on the fusing seal part 3 so as to be easily opened by hand.

At this time, the tear strength of the fusing seal portion 3 in the longitudinal direction was measured by the tensile tester used in Example 1, and as a result, the tear strength was 0.105 kgf. The tear strength is determined by the V of the fusing seal portion 3 of the heat-shrinkable tubular label 1.
The film including the V-shaped notch is cut in the longitudinal direction at a width of 15 mm into a test piece, and the film on the left side of the V-shaped notch of the test piece is fixed to a chuck of a tensile tester, and the other chuck (moving chuck) ) Was fixed to the film on the right side of the V-shaped notch, and the measurement was performed by moving the moving chuck downward at a pulling speed of 200 mm / min.

Next, the heat-shrinkable cylindrical label 1 was mounted on a 500 ml PET bottle filled with tea and heat-shrinked in a shrink tunnel as in Example 1, and the heat-shrinkable cylindrical label 1 was placed on the PET bottle 4. Label 1 was adhered. The heat-shrinkable cylindrical label 1 was tightly adhered to the PET bottle 4, and no wrinkle, vertical shrinkage, whitening, distortion of the picture, and the like were observed on the heat-shrinkable cylindrical label 1. In addition, the heat-shrinkable cylindrical label 1
The heat-shrinkable cylindrical label 1 was not broken and was not detached from the PET bottle 4 even when the PET bottle 4 equipped with was dropped from a height of 1 m. Further, when the heat-shrinkable cylindrical label 1 attached to the PET bottle 4 is torn in the vertical direction by hand using the V-shaped notch 5a, the fusing seal portion 3 is broken, and the heat-shrinkable cylindrical label 1 is placed on the PET bottle 4. It could be easily removed from bottle 4.

(Embodiment 4) As in Embodiment 1, LLDP
Using the uniaxially stretched film E, a heat-shrinkable LLDPE film 2a was produced as shown in FIG. Next, this heat-shrinkable LLDPE film 2a was
As shown in (b), 500 ml PET filled with tea
The heat-shrinkable LLDPE film 2a is wound around the bottle 4 and, as shown in FIG. Then, the heat-shrinkable cylindrical label 1 was attached to the PET bottle 4.

Next, as in the first embodiment, the heat-shrinkable cylindrical label 1 is heat-shrinked in a shrink tunnel, and the heat-shrinkable cylindrical label 1 is placed on a PET bottle 4 as shown in FIG. Was adhered. The heat-shrinkable cylindrical label 1 was tightly adhered to the PET bottle 4, and no wrinkle, vertical shrinkage, whitening, distortion of the picture, and the like were observed on the heat-shrinkable cylindrical label 1.
Further, a PET bottle 4 equipped with the heat-shrinkable tubular label 1
Was dropped from a height of 1 m, and the heat-shrinkable tubular label 1 was not broken and detached from the PET bottle 4. Further, similarly to the first embodiment, the fusing seal portion 3 of the heat-shrinkable tubular label 1 attached to the PET bottle 4 is moved in the horizontal direction (FIG. 1).
2 (d), the fusing seal portion 3 was broken, and the heat-shrinkable cylindrical label 1 could be easily removed from the PET bottle 4. The transverse sealing strength of the fusing seal portion 3 of the heat-shrinkable tubular label 1 was measured in the same manner as in Example 1. As a result, 1.96 kgf / 15 was obtained.
mm width.

Example 5 A uniaxially stretched multilayer film having the following specifications was prepared by a coextrusion method. Film composition: PS 10 μm / LLDPE 60 μm / P
S 10 μm Specific gravity: 0.96 Heat shrinkage: 30% at 80 ° C., 49% at 95 ° C., 3% at 80 ° C. After printing a pattern and characters on the back surface of the multilayer film by gravure printing, the printed film is 70 mm long × 210 mm wide.
mm, and as shown in FIG.
A heat-shrinkable multilayer film 2c was produced. Next, Example 1
Similarly, as shown in FIG. 13B, a fusing seal portion 3 is formed on the heat-shrinkable multilayer film 2c, and a fold diameter of 10 mm is formed.
A heat-shrinkable cylindrical label 1 of 3 mm was produced. Further, after the fusing seal portion 3 is formed, as shown in FIG. 13C, the V-shaped notch 5a is formed so that the fusing seal portion 3 can be easily opened by hand.
Was provided. The tear strength in the longitudinal direction of the fusing seal portion 3 at this time was measured in the same manner as in Example 3, and as a result, the tear strength was 0.105 kgf.

Next, the heat-shrinkable cylindrical label 1 is mounted on a 500 ml PET bottle filled with tea and heat-shrinked in a shrink tunnel as in Example 1, and the heat-shrinkable cylindrical label is put on the PET bottle 4. Label 1 was adhered. The heat-shrinkable cylindrical label 1 was tightly adhered to the PET bottle 4, and no wrinkle, vertical shrinkage, whitening, distortion of the picture, and the like were observed on the heat-shrinkable cylindrical label 1. In addition, the heat-shrinkable cylindrical label 1
The heat-shrinkable cylindrical label 1 was not broken and was not detached from the PET bottle 4 even when the PET bottle 4 equipped with was dropped from a height of 1 m. Further, when the heat-shrinkable cylindrical label 1 attached to the PET bottle 4 is torn in the vertical direction by hand using the V-shaped notch 5a, the fusing seal portion 3 is broken, and the heat-shrinkable cylindrical label 1 is placed on the PET bottle 4. It could be easily removed from bottle 4.

[0048]

According to the present invention, the center seal portion of the heat-shrinkable cylindrical label is formed by a fusing seal, and the fusing seal portion is provided with an easy-open portion such as a cut for facilitating tearing. Therefore, when the heat-shrinkable cylindrical label of the present invention is used for a PET bottle, the heat-shrinkable cylindrical label can be easily separated from the used PET bottle by hand when the used PET bottle is regenerated. Also,
The heat-shrinkable cylindrical label of the present invention has a specific gravity of less than 1 using a polyolefin-based film having a specific gravity of less than 1 or a laminated film of a polyolefin-based resin and a polystyrene-based resin (or a polyester-based resin). Therefore, since the PET bottle and the heat-shrinkable tubular label are crushed when the used PET bottle is recycled, since the crushed body of the heat-shrinkable tubular label floats on the water, By the specific gravity separator, the pulverized body of the PET bottle and the heat-shrinkable tubular label can be efficiently separated with water. Therefore, if the heat-shrinkable cylindrical label of the present invention is used for a PET bottle, the PET bottle and the heat-shrinkable cylindrical label can be efficiently separated in the process of recycling the used PET bottle. Can reduce the reproduction cost.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an example of a heat-shrinkable tubular label of the present invention.

FIG. 2 is a front view when the heat-shrinkable cylindrical label of the present invention is mounted on a PET bottle, and is a diagram in which a V-shaped easy-opening portion is provided on the heat-shrinkable cylindrical label.

FIG. 3 is a front view when the heat-shrinkable cylindrical label of the present invention is mounted on a PET bottle, and is an explanatory view when the fusing seal portion of the heat-shrinkable cylindrical label is torn in a lateral direction.

FIG. 4 is a view showing various forms of an easy-opening portion provided in a fusing seal portion of the heat-shrinkable tubular label of the present invention.

FIG. 5 shows a case where a fusing seal portion is formed from one heat-shrinkable film.
It is explanatory drawing at the time of forming a part and producing a heat-shrinkable cylindrical label.

FIG. 6 shows a case where a fusing seal portion is formed from two heat-shrinkable films.
It is explanatory drawing at the time of forming a part and producing a heat-shrinkable cylindrical label.

FIG. 7 is an explanatory diagram when a heat-shrinkable tubular label is continuously produced from one heat-shrinkable film.

FIG. 8 is an explanatory diagram when one heat-shrinkable film is wound around a PET bottle to produce a heat-shrinkable cylindrical label.

FIG. 9 is an explanatory diagram for producing a heat-shrinkable tubular label according to Example 1.

FIG. 10 is an explanatory diagram for producing a heat-shrinkable tubular label according to Example 2.

FIG. 11 is a schematic view of a heat-shrinkable cylindrical label produced according to Example 3.

FIG. 12 is an explanatory diagram when a heat-shrinkable cylindrical label is produced according to Example 4.

FIG. 13 is an explanatory diagram for producing a heat-shrinkable cylindrical label according to Example 5.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Heat-shrinkable cylindrical label 2 Heat-shrinkable film 2a Heat-shrinkable LLDPE film 2b Heat-shrinkable HDPE film 2c Heat-shrinkable multilayer film 3 Fusing seal part 4 PET bottle 5 Easy-opening part 5a V-shaped notch 5b Knob 5c Meat Thick part 5d Tearing tape 5e Cut 6 Cutting line

Continued on the front page F term (reference) 4F100 AK01A AK01B AK03A AK03B AK05 AK12A AK12B AK41A AK41B AK63 BA02 DA06A DA06B DA11 DB01A DB01B DB06A DB06B DC13A DC13B EC03A EC03B EC032 J JA13JB13 JA03B JA13J03B

Claims (10)

[Claims] 1. A heat-shrinkable tubular label having a heat-shrinkable film formed in a tubular shape, wherein the heat-shrinkable film has a density of 1
g / cm ³ of a single-layer or multi-layer thermoplastic resin film, wherein a seal formed in the longitudinal direction of the cylindrical label is formed by a fusing seal. label. 2. The heat-shrinkable film has a density of 0.9.
It is a single-layer or multilayer film composed of an olefin resin having a density of 6 g / cm ³ or less, or a multilayer film composed of a polyolefin resin and a styrene resin or a polyester resin, and has a density of 0.96 g / cm ³ or less. The heat-shrinkable tubular label according to claim 1, wherein: 3. The heat-shrinkable cylindrical label according to claim 1, wherein the fusing seal portion formed by the fusing seal has a strength such that it can be easily opened in the lateral direction by hand. . 4. The fusing seal portion can be easily opened in the vertical direction by hand by providing a notch for tearing or a thick portion which can be easily picked by a finger, or by attaching a tearing tape to the fusing seal portion. The heat-shrinkable cylindrical label according to claim 1 or 2, wherein 5. The heat-shrinkable cylindrical label is a label attached to a polyethylene terephthalate bottle, and when the polyethylene terephthalate bottle is regenerated, a crushed product of the polyethylene terephthalate bottle and the heat-shrinkable cylindrical label is subjected to a density reduction. The heat-shrinkable cylindrical label according to any one of claims 1 to 4, wherein the heat-shrinkable cylindrical label can be separated by water depending on a difference. 6. A heat-shrinkable film made of a single-layer or multi-layer thermoplastic resin film having a density of less than 1 g / cm ³ is formed into a cylindrical shape, and a sealing portion is formed in the longitudinal direction of the cylindrical film by a fusing seal. A method for producing a heat-shrinkable cylindrical label, which is a cylindrical label. 7. The method for manufacturing a heat-shrinkable cylindrical label according to claim 6, wherein the fusing seal portion formed by the fusing seal has a strength that can be easily opened by hand in a lateral direction. 8. The fusing seal portion is easily opened in the vertical direction by hand by forming a notch for tearing or a thick portion which is easy to pick with a finger, or by adhering a tearing tape to the fusing seal portion. 7. The method for producing a heat-shrinkable tubular label according to claim 6, wherein the method is performed. 9. Using two heat-shrinkable tubular films,
A heat-shrinkable cylindrical label is formed by providing two fusing seal portions, and a tear cut is provided in the two fusing seal portions so that the fusing seal portion can be easily opened by hand in the vertical direction. The method for producing a heat-shrinkable cylindrical label according to claim 6, wherein: 10. A heat-shrinkable film made of a single-layer or multi-layer thermoplastic resin film is wound around a package to form a tube, and both ends of the heat-shrinkable film formed into a tube are melt-sealed by a blow-sealing seal. To form a heat-shrinkable cylindrical label of the package, and by providing a tear cut in the fusing seal portion, the heat-shrinkable cylindrical label can be easily opened by hand in the vertical direction from the fusing seal portion. The method for producing a heat-shrinkable cylindrical label according to claim 6, wherein