KR101486799B1 - Heat Shrinkable Film for Label with Low Specific Gravity and Process of Preparing Same - Google Patents

Heat Shrinkable Film for Label with Low Specific Gravity and Process of Preparing Same Download PDF

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KR101486799B1
KR101486799B1 KR1020130140462A KR20130140462A KR101486799B1 KR 101486799 B1 KR101486799 B1 KR 101486799B1 KR 1020130140462 A KR1020130140462 A KR 1020130140462A KR 20130140462 A KR20130140462 A KR 20130140462A KR 101486799 B1 KR101486799 B1 KR 101486799B1
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South Korea
Prior art keywords
film
layer
label
heat shrinkable
foam layer
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KR1020130140462A
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Korean (ko)
Inventor
오원석
오영택
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동일화학공업 주식회사
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Priority to KR1020130140462A priority Critical patent/KR101486799B1/en
Priority claimed from CN201380051050.6A external-priority patent/CN104684726B/en
Priority claimed from EP14151899.3A external-priority patent/EP2796286B8/en
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B32LAYERED PRODUCTS
    • B32BLAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00Layered products comprising a layer of synthetic resin
    • B32B27/06Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B27/065Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material of foam
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B32LAYERED PRODUCTS
    • B32BLAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00Layered products comprising a layer of synthetic resin
    • B32B27/30Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers
    • B32B27/302Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers comprising aromatic vinyl (co)polymers, e.g. styrenic (co)polymers
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B32LAYERED PRODUCTS
    • B32BLAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B37/00Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
    • B32B37/06Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the heating method
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B32LAYERED PRODUCTS
    • B32BLAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B38/00Ancillary operations in connection with laminating processes
    • B32B38/0012Mechanical treatment, e.g. roughening, deforming, stretching
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B32LAYERED PRODUCTS
    • B32BLAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B5/00Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
    • B32B5/18Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by features of a layer of foamed material
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B32LAYERED PRODUCTS
    • B32BLAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2266/00Composition of foam
    • B32B2266/02Organic
    • B32B2266/0214Materials belonging to B32B27/00
    • B32B2266/0221Vinyl resin
    • B32B2266/0228Aromatic vinyl resin, e.g. styrenic (co)polymers
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B32LAYERED PRODUCTS
    • B32BLAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00Properties of the layers or laminate
    • B32B2307/70Other properties
    • B32B2307/732Dimensional properties
    • B32B2307/734Dimensional stability
    • B32B2307/736Shrinkable
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B32LAYERED PRODUCTS
    • B32BLAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2519/00Labels, badges

Abstract

The heat shrinkable film for label according to the present invention comprises a foam layer 10 mainly composed of polystyrene and a pair of non-foam layers 20 melt-bonded to both sides of the foam layer 10, And the pair of non-foam layers (20) are co-extruded and have a low specific gravity of less than 1.0. The heat shrinkable film for labels according to the present invention is produced by co-extruding each raw material so as to form a non-foam layer 20 on both sides of a foamed intermediate layer 10 having polystyrene as a main component, thereby forming an unstretched film, And stretched in the TD (transverse direction) direction. The stretching in the TD direction is preferably 3.5 to 5.5 times, and most preferably about 4.5 times. The foam layer 10 is preferably foamed at a foaming ratio in the range of 5 to 20%. It is preferable that the thickness of the foam layer 10 is in the range of 60 to 90% with respect to the thickness of the entire film and the thickness of the pair of non-foam layers 20 is in the range of 5 to 20% with respect to the thickness of the entire film. The heat shrinkable film for label of the present invention preferably has a thickness in the range of 30 to 60 mu m.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat shrinkable film for a label having a low specific gravity,

The present invention relates to a heat shrinkable film used for forming a label on the outer periphery of various containers such as a plastic container, a glass bottle, an aluminum can and the like. More particularly, the present invention relates to a heat shrinkable film suitable for use as a labeling film for various containers and having a low specific gravity to facilitate water separation, and a method for producing the same.

The heat shrinkable film is used for a label formed to surround the outer periphery of a container such as various synthetic resin containers such as a bottle of polyester (PET), a glass bottle, an aluminum can and the like (hereinafter referred to as a container). That is, the contents necessary for a heat shrinkable film for a label are printed, the printed film is attached to the container in a cylindrical shape (called tubing or seaming), and hot air is applied from outside to adhere to the outer periphery of the container .

The heat shrinkable film for labels to be wrapped around the outer periphery of the container by heat shrinkage must meet various physical properties in consideration of the label manufacturing process, quality or appearance. Such physical properties include heat resistance, printability, glossiness, transparency, adhesiveness, shrinkability, high-speed workability, aesthetic condition and stability of circulation process.

Among the synthetic resin films known so far, PVC films have been found to be most suitable as heat shrinkable films for labels. PVC films have been widely used as heat-shrinkable films for labels because properties such as heat resistance, printability, gloss, transparency, adhesiveness, and stretchability are suitable for labels. PVC films, however, contain fatal defects in environmental pollution because they produce environmental hormones during disposal after use. Therefore, Korea and Taiwan are already regulating the use of PVC film as a label, and other developed countries are prohibiting their use through laws or autonomous regulations.

PET films and PS films were developed to replace PVC films for labels. PET film or PS film has no environmental pollution problem like PVC film, and can be easily recovered or regenerated, but there are also a few problems that must be overcome for use for labeling.

The PET film has good heat resistance, printability and adhesiveness, but it has a specific gravity of about 1.35, which causes a rise in production cost and has the disadvantage that overshrinkage occurs during heat shrinkage. When shrinkage occurs, the glass bottle or aluminum cans are not affected. However, in the case of a plastic container, the container is distorted or deformed. Since the PET film has good heat resistance, it can be used even when it is required to be sterilized at a high temperature of 98 캜, such as fruit juice.

On the other hand, the PS film is advantageous in that it has good low-temperature shrinkability, light weight of about 1.05 and light shrinkage. Because of its good low-temperature shrinkability, it is suitable for use as a label for containers of milk products such as milk and yogurt. Since the specific gravity is light, the manufacturing cost can be reduced, and since the shrinkage does not occur, a beautiful appearance can be maintained after the heat shrinkage. However, since the PS film uses an alcohol-based solvent without using toluene or benzene in the printing process, the PS film is good in environmental properties. However, since the printing property is difficult, there is a problem in that a good ink for printing has to be appropriately selected or developed.

In order to solve the above problems, the present applicant has developed a heat-shrinkable film for labels and has been patented in Korean Patents Nos. 926716 and 1156607, and has filed a patent application in Patent Application No. 2012-25974.

The heat shrinkable film for a label of Japanese Patent No. 926716 has a three-layer structure in which a PS film layer is an intermediate layer and a PET film layer is bonded to both sides of the PS film film layer. The three- It is suitable for use as a film for labeling because all properties such as gloss, transparency, adhesiveness and stretchability are good.

The heat shrinkable film for a label of Japanese Patent No. 1156607 has a structure in which a PS film layer having a specific structural formula is an intermediate layer and a PET film layer having a specific structural formula is bonded to both sides of the intermediate layer, Provided is a film for labels which has good low-temperature shrinkability and does not cause excessive shrinkage.

The heat-shrinkable film for the label of the patent application No. 2012-25974 is composed of a PS film layer having a specific structural formula and a PET film layer having a specific structural formula so as to prevent peeling of the film even in the case of printing over 5 degrees A heat-shrinkable film for a new label.

However, although the above-mentioned label film is applied to the container, it has been difficult to recover the container for recycling due to the label. For example, almost all containers are made of PET. In order to recycle a PET container, it is necessary to shrink the container and remove the attached label. The reason why the label is to be removed is that the label usually contains a PS component and therefore the components thereof are different from those of PET and the label is printed with various colors of inks, Therefore, the value of the product is reduced when the PET container is recycled. For this reason, the Korean government also encourages the development of labeling films that are easy to separate and discard, and to facilitate the recovery of PET bottles.

When the PET container with label is crushed and separated by water, the specific gravity of PET is usually about 1.35, so that the shattered PET pieces sink downward. If the specific gravity of the label is less than 1, the shattered label will float on the water The shredded label can be easily removed and separated. By doing so, PET pieces that settle down can be easily recovered and recycled. In order to separate the salt from the brine, it is necessary to wash the brine with the brine again.

The heat shrinkable film for labels having a low specific gravity of the present invention has been developed under the above-mentioned object, and the specific gravity is smaller than 1 to develop a film for labeling on water. The PET bottle in which the film of the present invention is used as a label is recovered and cut to a suitable size in a cutter. When a piece of cut PET bottle is put into the water, the PET bottle piece sinks down and the label film floats on the water. Discard the label film on the water, discard it, and collect the recycled PET pieces.

An object of the present invention is to provide a film for labeling which floats on water by having a specific gravity smaller than one.

Another object of the present invention is to provide a film for labels floating on water having a specific gravity in the range of 0.9 to less than 1.

It is still another object of the present invention to provide a heat shrinkable film for a label which satisfies all of the physical properties as a heat shrinkable film for labels such as heat resistance, printability, gloss, transparency, adhesiveness, stretchability, And to provide a film for a label having a low specific gravity.

Another object of the present invention is to provide a film for label which can facilitate water separation by making the specific gravity smaller than 1.

Another object of the present invention is to provide a labeling film that can reduce the manufacturing cost by using less raw materials and meet the weighting ratio reduction ratio required in the national policy of the world.

The above and other objects of the present invention can be achieved by the present invention described below.

The heat shrinkable film for label according to the present invention comprises a foam layer 10 mainly composed of polystyrene and a pair of non-foam layers 20 melt-bonded to both sides of the foam layer 10, And the pair of non-foam layers (20) are co-extruded and have a low specific gravity of less than 1.0.

The heat shrinkable film for labels according to the present invention is produced by co-extruding each raw material so as to form a non-foam layer 20 on both sides of a foamed intermediate layer 10 having polystyrene as a main component, thereby forming an unstretched film, And stretching in the TD (transverse direction) direction. The stretching in the TD direction is preferably 3.5 to 5.5 times, and most preferably about 4.5 times.

The foam layer 10 is preferably foamed at a foaming ratio in the range of 5 to 20%.

It is preferable that the thickness of the foam layer 10 is in the range of 60 to 90% with respect to the thickness of the entire film and the thickness of the pair of non-foam layers 20 is in the range of 5 to 20% with respect to the thickness of the entire film.

The heat shrinkable film for labels of the present invention preferably has a specific gravity of 0.9 to less than 1.

The heat shrinkable film for label of the present invention preferably has a thickness in the range of 30 to 60 mu m, but is not limited thereto.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

The present invention relates to a labeling film which floats on water by making the specific gravity smaller than 1 and relates to a labeling film for labeling such as heat resistance, printability, gloss, transparency, adhesiveness, stretchability, (Water) separation can be facilitated by having a low specific gravity that floats on the water while satisfying all of the physical properties of the heat-shrinkable film for labels, which can reduce the manufacturing cost by using less raw materials, The present invention provides the effect of the present invention.

FIG. 1 is a schematic cross-sectional view of a heat shrinkable film having a three-layer structure according to the present invention.
2 (a) is a cross-sectional photograph of a foamed layer 10 of a heat shrinkable film having a three-layer structure according to the present invention, in which Fig. 2 Is a microscope sectional photograph enlarged at 500 magnification, and FIG. 2D is a microscopic sectional photograph enlarged at 1000 magnification.

The present invention relates to a heat shrinkable film used for forming a label on the periphery of a synthetic resin container, particularly a PET bottle container, and is suitable for use as a labeling film for various containers and has a low specific gravity The present invention relates to a heat shrinkable film. FIG. 1 is a schematic cross-sectional view of a heat shrinkable film having a three-layer structure according to the present invention.

The heat shrinkable film for label according to the present invention comprises a foam layer 10 mainly composed of polystyrene and a pair of non-foam layers 20 melt-bonded to both sides of the foam layer 10, And the pair of non-foam layers 20 are co-extruded to have a low specific gravity.

In the present invention, the foam layer 10 should be located in the middle layer, that is, inside the film. In other words, a pair of non-foam layers 20 are melt-bonded to both sides of the foam layer to form a three-layer structure. The reason that the foam layer 10 is located inside the film and the non-foam layer 20 is located in the skin layer is that the contents necessary for the non-foam layer as the skin layer must be printed. Since the foamed layer 10 foamed with polystyrene as a main component is not uniform in its surface, good printing quality can not be maintained when printing is performed. However, since the surface of the non-foam layer 20 is uniform, good printing can be performed.

Of course, the heat shrinkable film for label of the present invention may be composed of a foam layer 10 mainly composed of polystyrene and a non-foam layer 20 melt-bonded to one side of the foam layer 10. In this case, the surface of the non-foam layer should be printed. The above-mentioned three-layered film can be printed on any surface because both surfaces are non-foamed layers.

The reason for forming the foam layer as the intermediate layer of the film in the present invention is to reduce the specific gravity. In the present invention, it is preferable that the specific gravity of the film is in the range of about 0.9 to less than 1. For this purpose, the foam layer 10 is preferably foamed at a foaming ratio in the range of 5 to 20%. The larger the expansion ratio, the smaller the specific gravity. However, since the heat-shrinkable film for label is shrunk and then adhered to the outer periphery of the container, the shrinkage ratio should be good. However, when the foaming rate of the foam layer 10 exceeds 20%, the shrinkage rate decreases, and thus it can not be applied to general containers. On the other hand, if the expansion ratio of the foam layer 10 is less than 5%, the specific gravity increases, and the specific gravity of about 0.9 to less than 1 required in the present invention can not be obtained.

In one embodiment of the invention, the thickness of the foam layer 10 is in the range of 60 to 90% with respect to the thickness t of the total film, and the thickness of the pair of non- To 5% and 20%, respectively. The heat shrinkable film for label of the present invention preferably has a thickness in the range of about 30 to 60 mu m, but is not limited thereto.

The heat shrinkable film for label according to the present invention is prepared by coextruding each raw material so that a foam layer 10 composed mainly of polystyrene and a pair of non-foam layers 20 melt-adhered to both sides of the foam layer 10 are formed And then stretching the unstretched film in the transverse direction (TD) direction.

The heat-shrinkable film of the present invention may contain all of polystyrene as a main component. The foam layer 10 co-extrudes a pair of non-foam layers 20 on both sides while foaming using a foaming agent. Such a technique of co-extruding a film into a three-layer structure can be easily carried out by a person skilled in the art to which the present invention belongs.

The polystyrene resins used in the present invention are various. The polystyrene resin is transparent and has good workability, but has a weak impact strength. Therefore, polystyrene copolymerized by adding a rubber component such as butadiene can be preferably used.

One preferred embodiment of the foam layer 10 of the present invention may comprise from 30 to 95% by weight of styrene-butadiene copolymer and from 5 to 70% by weight of universal polystyrene. Also, one preferred embodiment of the non-foam layer 20 of the present invention comprises 30 to 95 wt% of styrene-butadiene copolymer, 4.9 to 65 wt% of universal polystyrene, 0.1 to 5 wt% of high impact polystyrene (HIPS) . ≪ / RTI >

The foaming agent used for forming the foam layer 10 is preferably used in an amount of 0.01 to 1.0% by weight based on the total weight of the foam layer. However, since the use amount of the foaming agent is directly related to the foaming ratio, the amount of the foaming agent can be appropriately increased or decreased in consideration of the foaming ratio in the range of 5 to 20% as described above. Of course, no foaming agent should be added to the non-foam layer 20.

The foaming agent used in the present invention includes organic and inorganic foaming agents. Representative commercially available examples include azodicarbonamide, p, p'-oxybis (benzene sulfonyl hydrazide), p-tolune sulfonyl hydrazide sulfonyl hydrazide, p-toluene sulfonyl acetone hydrazone, N, N'-dinitrosopentamethylene tetramine, p-toluenesulfonyl semi- P-tolune sulfonyl semicarbazide, 5-phenyltetrazole, and sodium bicarbonate.

The foam layer 10 has a microscopic structure in which cells containing air bubbles are uniformly formed. The cells are small and uniformly distributed so that a high quality foam film can be produced. The blowing agent should be able to generate the gas uniformly during the extrusion process so that small cells are uniformly distributed. The foaming agent is mixed with the polystyrene resin, heated, and then extruded into a molten state.

2 is a cross-sectional photograph of a foamed layer 10 of a heat shrinkable film having a three-layer structure according to the present invention, in which Fig. 2a is an enlarged cross-sectional photograph, Fig. 2b is a cross- 2C is a micrograph of a cross section of the foam layer 10 enlarged at a magnification of 500, and FIG. 2D is a micrograph of a cross section of the foam layer 10 at a magnification of 1000 magnification. Although the bubbles can not be seen clearly in FIG. 2B, the bubbles are evenly distributed in the photographs enlarged at the magnification of 500 or 1000, and in FIGS. 2C and 2D.

A small amount of a white pigment can be added to the foam layer 10 and the non-foam layer 20. As the white pigment, conventionally known pigments based on titanium oxide (TiO 2 ) or titanium oxide can be preferably used. The white pigment may be used in the range of about 1 to 5% by weight based on the resin used.

A dispersing agent may be used together with the foaming agent to facilitate dispersion of the foaming agent. As a typical dispersant, paraffin oil is used, and a small amount of paraffin oil is added in an amount of about 0.1 to 0.5% by weight based on the total resin of the foam layer 10.

The unstretched film produced by co-extrusion is stretched in the transverse direction (TD) to produce a heat shrinkable film for label. The reason why the unstretched film is stretched in the TD direction is to give a shrinkage ratio. It is preferable that the unstretched film is stretched at an elongation of about 3.5 to 5.5 times in the TD direction. When the width of the non-stretched film is usually 750 mm, it is preferable to stretch the film to a width of about 2,500 mm to 4,100 mm. If necessary, it may be stretched by a two-step stretching method. The two-step stretching method is described in detail in Patent No. 741935 of the present applicant.

A high elongation means that the shrinkage rate is high when heated. Therefore, if the surface of the container is severely curved, the elongation percentage should be increased to increase the shrinkage rate. Conversely, a low elongation means that the shrinkage rate is low when heated. Therefore, when the surface of the container is hardly bent, the film can be produced with a low elongation.

In one embodiment of the invention, the thickness of the foam layer 10 is about 80% of the thickness of the total film, the thickness of one non-foam layer 20 is about 10% of the thickness of the total film, Is set at 15%, a labeling film having a specific gravity of about 0.9 to less than 1, which is required in the present invention, can be obtained. The heat shrinkable film for label of the present invention preferably has a thickness in the range of about 30 to 60 mu m, but is not limited thereto.

The heat shrinkable film for label according to the present invention is a semi-transparent film because the foam layer 10 is located in the intermediate layer. When added to the foamed layer to which the white pigment is added and the non-foamed layer, a white opaque film can be obtained. However, conventional films are transparent films because no foam layer is formed. In order to use such a transparent film as a label, the contents to be printed are printed on the surface to be bonded to the container, and then printed (coated) with the white ink usually about three times. So that the contents can not be seen through the attached label and the printed contents are clearly displayed. However, since the heat shrinkable film for label according to the present invention is translucent or opaque, it is possible to print directly on the opposite side, that is, the outer side, rather than printing on the side bonded to the container like a conventional transparent film. When printing directly on the outer surface and then printing once with white ink, a sufficient printing effect can be exhibited. That is, since the conventional transparent film is printed (coated) with white ink about three times after printing the contents, the heat shrinkable film for label of the present invention is sufficient to print the content and then to print once with white ink, The process can be shortened and the cost can be reduced.

Further, since the thickness of the foam layer 10 is in the range of 60 to 90% with respect to the thickness t of the entire film, the present invention provides a raw material saving effect of about 6 to 9% when the foaming ratio is 10% When the foaming ratio is 20%, the raw material saving effect is about 12 to 18%.

The heat shrinkable film for a label of the present invention will be more specific according to the embodiments described below, and the following embodiments are described for illustrative purposes only and do not limit or limit the scope of protection of the present invention.

Examples 1-2

Styrene-butadiene copolymer (SBC), general purpose polystyrene (GPPS), white pigment, and foaming agent were added to the foam layer hopper in the contents shown in Table 1 below to form a foam layer. At the same time, styrene-butadiene copolymer (SBC), general purpose polystyrene (GPPS), high strength polystyrene (HIPS), white pigment and foaming agent were added to the nonfoamed layer hopper in the amounts shown in Table 1 below to form a nonfoamed layer. The nonfoamed layer was designed to be extruded on both sides using one hopper, but with a foamed layer in the middle and a nonfoamed layer on both sides.

As SBC, 631M of DENKA SINGAPORE PTE LTD was used, GPPS of DENKA SINGAPORE PTE LTD was used as GPPS, and Polystyrol 576H of BASF of Korea was used as HIPS. As white pigment, TSM1HC854 manufactured by Hanil TOYO Co., Ltd. was used, and ES207A manufactured by Nippon Film Chemical Co., Ltd. was used as a foaming agent.

The width of the non-stretched film was set to 750 mm, and the stretched film was stretched 4.5 times in the TD direction to have a width of 3375 mm.

As a result of the water tank test, the film of Example 1-2 was flooded with water and its specific gravity was 0.98. Table 1 shows the film thickness, tensile strength, elongation, tear strength, static electricity, transparency, stiffness, coefficient of friction, and shrinkage according to temperature change. Each measurement method is as follows.

Tensile strength and elongation: measured according to ASTM D882.

Tear strength: Measured according to ASTM D1938.

Static electricity: Measured according to JIS 61340.

Transparency: measured according to ASTM D1003.

Friction Coefficient: Measured according to ASTM D1894.

Shrinkage rate: The shrinkage rate after precipitation in a constant temperature water bath for 10 seconds was measured.

Figure 112013105085445-pat00001

Remark) "O" in the water tank test means that the film stays on the water.

Example 3-4

A paraffin oil was added for the purpose of spraying a foaming agent, and the same composition as in Table 2 was carried out in the same manner as in Example 1-2, except that a powdery foaming agent was used. Example 3 was conducted with a target thickness of 45 탆, and Example 4 was conducted with a target film thickness of 50 탆.

As a result of the water tank test, the film of Example 3-4 was flooded with water and its specific gravity was 0.98. Film thickness, tensile strength, elongation, tear strength, static electricity, transparency, stiffness, coefficient of friction, and shrinkage according to temperature were measured and are shown in Table 2.

Figure 112013105085445-pat00002

It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

10: foam layer 20: a pair of non-foam layers
t: Film thickness

Claims (16)

  1. The heat shrinkable film according to any one of claims 1 to 3, wherein the film comprises 30 to 95% by weight of a styrene-butadiene copolymer foamed with a foaming agent in a range of 5 to 20% by foaming agent in an amount of 0.01 to 1.0% 30 to 95% by weight of a styrene-butadiene copolymer, 4.9 to 65% by weight of universal polystyrene, and a high-strength layer of a non-foamed layer melt-adhered to both sides of the foam layer 10, And a pair of non-foam layers (20) composed of 0.1 to 5% by weight of polystyrene (HIPS: High Impact Polystyrene), wherein the foam layer (10) and the pair of non- Wherein the thickness of the film is in the range of 30 to 60 占 퐉 and has a specific gravity of less than 1.0.
  2. 2. The method of claim 1, wherein the foam layer (10) has a thickness in the range of 60 to 90% relative to the total film, and the pair of non-foam layers (20) And a heat shrinkable film for a label.
  3. delete
  4. delete
  5. delete
  6. The heat shrinkable film for labels according to claim 1, wherein the specific gravity of the film is in the range of 0.9 to less than 1.0.
  7. A foaming layer 10 made of 30 to 95% by weight of a styrene-butadiene copolymer and 5 to 70% by weight of general-purpose polystyrene foamed at a foaming ratio in the range of 5 to 20% by a foaming agent of 0.01 to 1.0% 30 to 95% by weight of a styrene-butadiene copolymer, 4.9 to 65% by weight of universal polystyrene, and 0.1 to 65% by weight of High Impact Polystyrene (HIPS) To 5% by weight of a non-foamed layer (20) is formed by the co-extrusion of each raw material to produce an unoriented film; And
    Stretching the unstretched film in the transverse direction (TD) direction;
    Wherein the thickness of the film is in the range of 30 to 60 占 퐉.
  8. 8. The method of producing a heat shrinkable film for label according to claim 7, wherein the stretching step comprises stretching the unstretched film at an elongation rate of 3.5 to 5.5 times in the TD direction.
  9. delete
  10. The method according to claim 8, wherein the foam layer (10) further comprises a dispersing agent for facilitating dispersion of the white pigment or the foaming agent.
  11. The method of claim 8, wherein the non-foam layer (20) further comprises 1 to 5 parts by weight of a white pigment relative to 100 parts by weight of the non-foam layer (20).
  12. 9. The method of claim 8, wherein the foam layer (10) has a thickness in the range of 60 to 90% relative to the total film, and the pair of non-foam layers (20) Wherein the thermally shrinkable film has a thickness of 100 탆 or less.
  13. delete
  14. delete
  15. The method for producing a heat shrinkable film for label according to claim 12, wherein the specific gravity of the film is 0.9 to less than 1.0.
  16. A heat shrinkable film for labels produced by the process according to any one of claims 10 to 12 and 15.

KR1020130140462A 2013-11-19 2013-11-19 Heat Shrinkable Film for Label with Low Specific Gravity and Process of Preparing Same KR101486799B1 (en)

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KR1020130140462A KR101486799B1 (en) 2013-11-19 2013-11-19 Heat Shrinkable Film for Label with Low Specific Gravity and Process of Preparing Same
CN201380051050.6A CN104684726B (en) 2013-04-25 2013-11-28 With low-gravity heat shrink films for label and preparation method thereof
US14/785,467 US9944054B2 (en) 2013-04-25 2013-11-28 Heat-shrinkable film for label with low specific gravity and method for preparing the same
RU2014107452/05A RU2597384C2 (en) 2013-04-25 2013-11-28 Shrink film for labels with low specific weight and its manufacturing method
PCT/KR2013/010894 WO2014175527A1 (en) 2013-04-25 2013-11-28 Heat-shrinkable film for label having low specific gravity and method for manufacturing same
EP14151899.3A EP2796286B8 (en) 2013-04-25 2014-01-21 Heat-shrinkable film for label with low specific gravity and method for preparing the same

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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6125834A (en) * 1984-07-17 1986-02-04 Kasei Co C I Heat-shrinkable composite foamed resin film
JP2000007806A (en) * 1998-06-18 2000-01-11 Mitsubishi Plastics Ind Ltd Thermally shrinking foamed film, label and label- covered plastic vessel

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6125834A (en) * 1984-07-17 1986-02-04 Kasei Co C I Heat-shrinkable composite foamed resin film
JP2000007806A (en) * 1998-06-18 2000-01-11 Mitsubishi Plastics Ind Ltd Thermally shrinking foamed film, label and label- covered plastic vessel

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