KR20170100230A - Heat shrinkable insulated film - Google Patents

Abstract

The present invention relates to a heat shrinkable insulated film and, more specifically, to a heat shrinkable insulated film for packaging. The heat shrinkable insulated film comprises a heat shrinkable film and an insulation layer. The insulation layer comprises hollow beads and a binder resin. The shrinkage ratio with respect to the main shrinkage direction of the heat shrinkable insulate film is 15% or more. According to the present invention, compared to an existing heat shrinkable insulated film including an insulation layer, a heat shrinkable insulated film of the present invention is thin, has excellent heat shrinkage and insulation properties and has wear resistance and wrinkle prevention effects, thereby providing an excellent advertisement by showing aesthetic appearance after applied to a container.

Description

{HEAT SHRINKABLE INSULATED FILM}

The present invention relates to a heat-shrinkable film, and more particularly, to a heat-shrinkable film for packaging.

2. Description of the Related Art In recent years, there has been developed a stretched film (so-called " stretch film ") made of a polyvinyl chloride resin, a polystyrene resin, a polyester resin or the like for use in label packaging, cap seal, Heat-shrinkable films) have been widely used. The importance of heat-shrinkable films mounted for differentiation of products or for improving the visibility of products has increased, and therefore, the conventional heat-shrinkable films are required to be further improved in shrinkage characteristics. Heat-shrinkable films provide excellent visual effects and maximum advertising space on the container, while conventional shrink labels do not provide adequate insulation for the container. Therefore, there is a need to develop a heat-shrinkable heat-insulating film having a thin film thickness while providing a suitable insulation with little manufacturing cost. In addition, the heat-shrinkable heat-insulating film needs to be excellent in preventing wrinkles in order to show the beauty of the appearance. It is also desirable to develop a material that can be heat shrunk to fit into a container having a simple contour or a complicated contour without losing thermal insulation.

As described above, Japanese Laid-Open Patent Publication No. 2015-227428 entitled " Polylactic acid heat-shrinkable film and molded article using the above film, heat-shrinkable label, and the container using the molded article or the label " A polylactic acid heat-shrinkable film based on a polylactic acid resin and a polyamide-based elastomer has excellent rupture resistance and shrinkage characteristics, transparency is achieved even after heat shrinkage, and a polylactic acid heat-shrinkable film . In addition, in JP-A-2015-063650, " a method of producing a heat-shrinkable polyethylene film and a heat-shrinkable polyethylene film obtained by the production method ", a polyethylene resin containing a low-density polyethylene as a main component is heated in a longitudinal direction at a temperature not lower than the melting point of the low- Shrink polyethylene film which is inflation-molded so as to have a stretch ratio in all of the transverse direction, has a small tensile elongation, an excellent low-temperature shrinkability, and an excellent appearance after shrinkage.

The present inventors have made efforts to solve the above problems, and as a result, they have found that a heat-shrinkable film obtained by applying a heat-insulating layer containing a hollow bead and a binder resin to one or both surfaces of a heat-shrinkable film is excellent in heat shrinkability and heat- It was confirmed that the film had a wrinkle preventing effect, and the present invention was completed.

Japanese Patent Application Laid-Open No. 2015-227428 Japanese Laid-Open Patent Publication No. 2015-063650

An object of the present invention is to provide a heat-shrinkable film for packaging which is excellent in heat shrinkability and heat insulation property.

Another object of the present invention is to provide a heat-shrinkable film for packaging excellent in abrasion resistance and wrinkle prevention.

In order to achieve the above object, the present invention provides a heat-shrinkable film comprising a heat-shrinkable film and a heat insulating layer, wherein the heat insulating layer comprises a hollow bead and a binder resin, and the shrinkage ratio of the heat- And a heat shrinkable film.

In the present invention, the hollow bead size of the heat insulating layer is 0.02 to 2.5 micrometers, and the hollow silica is inorganic silica having a hollow ratio of 50 to 90%.

In the present invention, the hollow beads may contain one or more materials selected from the group consisting of TEOS (tetraethylorthosilicate), phenyl silane, TMOS (tetramethyl orthosilicate), SiCl ₄ , and silane having an organic group other than phenyl group, .

In the present invention, the thickness of the heat insulating layer is 0.5 to 10 micrometers.

In the present invention, the binder resin may be a polyolefin resin, a polyvinyl chloride resin, a polystyrene resin, a polyester resin, a polylactic acid resin, a polyurethane resin, a polycarbonate resin, a polyacrylic resin, ≪ RTI ID = 0.0 > and / or < / RTI >

In the present invention, the heat insulating layer may include 1.5 to 50 parts by weight of the hollow beads based on 100 parts by weight of the binder resin.

In the present invention, the heat-shrinkable film may be a polyolefin-based heat-shrinkable film, a polyvinyl chloride-based heat-shrinkable film, a polystyrene-based heat-shrinkable film, a polyester-based heat-shrinkable film, A polycarbonate-based heat-shrinkable film and a polyamide-based heat-shrinkable film.

In the present invention, the thickness of the heat-shrinkable film is 10 to 150 micrometers.

In the present invention, the heat shrinkable film has a shrinkage ratio of 5% or less with respect to a direction perpendicular to the main shrinkage direction.

The present invention also provides a container insulated with the heat shrinkable film.

According to the present invention, as compared with a heat-shrinkable film including a conventional heat insulating layer, the thickness of the film is thin, the heat shrinkability and the heat insulating property are excellent and the wear resistance and the wrinkle prevention effect of the heat shrinkable film are prevented. This is an advantage of providing excellent advertising.

1 is a perspective view illustrating a heat shrinkable film according to an embodiment of the present invention.
2 is a perspective view of a region where a container is coated with a heat-shrinkable film according to an embodiment of the present invention.
3 is a perspective view showing a container coated with a heat shrinkable film according to an embodiment of the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. For the sake of convenience, the size, line thickness, and the like of the components shown in the drawings referenced in the description of the present invention may be exaggerated somewhat. The terms used in the description of the present invention are defined in consideration of the functions of the present invention, and thus may be changed depending on the user, the intention of the operator, customs, and the like. Therefore, the definition of this term should be based on the contents of this specification as a whole.

1 is a view showing a heat-shrinkable film according to an embodiment of the present invention.

1, the structure of the heat shrinkable film 100 includes a heat insulating layer 110 including a hollow bead 120 and a binder resin 130 and a heat shrinkable film 140, 100) in the main shrinkage direction is 15% or more.

The hollow bead 120 can easily control the nano-sized fine thickness and can control the thickness of the insulating layer 110 including the hollow bead 120 to the nanometer scale . In addition, by increasing the number of the hollow beads 120 included in a single area while forming the coating thickness of the heat insulating layer 110 in units of nano, heat transfer can be minimized and the heat insulating property can be improved.

In the exemplary embodiment, the hollow bead 120 preferably has an average particle diameter of 0.02 to 10 mu m, and the thickness of the heat insulating layer 110 may be 0.5 to 10 mu m, preferably 1 to 3 mu m . At this time, the thickness of the heat insulating layer 110 may be equal to or thicker than the average particle diameter of the hollow beads 120. When the thickness of the heat insulating layer 110 is equal to the average particle diameter of the hollow beads 120, the hollow beads 120 are aligned in a line on the same line.

The average particle diameter of the hollow bead 120 and the thickness of the heat insulating layer 110 are preferably in the range described above in order to lower the abrasion and improve the durability.

In addition, the heat insulation performance in the heat insulating layer 110 can be improved through the hollow ratio of the hollow beads 120. In an exemplary embodiment, the hollow ratio of the hollow beads 120 is preferably 50 to 90%. At this time, the hollow ratio was determined by the following equation 1 by measuring the volume of the hollow formed in the entire volume of the hollow bead 120.

[Formula 1]

Hollow ratio (%) = volume of hollow / volume of hollow bead × 100

If the hollow bead 120 has a hollow ratio of less than the above range, the air content of the hollow bead 120 is reduced and heat transfer is increased. As a result, The film thickness of the film becomes thinner and the deformation strength is lowered. As a result, deformation of the particle shape due to high-temperature stretching or the like may occur during the production of the film, or the durability may be deteriorated.

The hollow bead 120 refers to silica. The composition of the hollow bead 120 is not particularly limited. However, the hollow bead 120 may be made of any one of TEOS (tetraethylorthosilicate), phenyl silane, TMOS (tetramethyl orthosilicate), SiCl ₄ , Or a mixture thereof may be used as a raw material.

The binder resin 130 may be a polyolefin resin, a polyvinyl chloride resin, a polystyrene resin, a polyester resin, a polylactic acid resin, a polyurethane resin, a polycarbonate resin, a polyacrylic resin, But is not limited thereto. The binder resins may be used alone or in combination of two or more.

That is, the heat insulating layer 110 preferably includes 1.5 to 50 parts by weight of the hollow beads 120 based on 100 parts by weight of the binder resin 130, that is, 1.5 or more parts by weight of the hollow beads, By weight. When the amount is 50 parts by weight or less, it is possible to reduce the manufacturing cost while sufficiently securing the heat insulating property. It is more preferable that the hollow bead is contained in an amount of 2 to 15 parts by weight based on 100 parts by weight of the binder resin (130) on the heat insulating side at 5 ° C.

The heat-shrinkable film (140) may be at least one selected from the group consisting of the polyolefin-based heat-shrinkable film, the polyvinyl chloride-based heat-shrinkable film, the polystyrene-based heat-shrinkable film, A carbonate-based heat-shrinkable film, and a polyamide-based heat-shrinkable film. The heat-shrinkable films may be used alone or in combination of two or more.

The heat-shrinkable film 140 may be applied to one side or both sides of the heat-shrinkable film 140 with an adhesive (not shown) attached to the heat-shrinkable film 140 and the heat- 110) and can act as a bridge.

In the exemplary embodiment, as described above, the thickness of the heat insulating layer 110 may be 0.5 to 10 占 퐉, preferably 1 to 3 占 퐉, and the thickness of the heat shrinkable film 140 may be 10 to 150 占 퐉 . In this case, the heat-shrinkable film 140 means that the heat insulating layer 110 is coated on one side.

When the thickness of the heat shrinkable film 140 is within the above range, the heat shrinkable film 100 is shrunk by heat regardless of the heat shrinkage rate of the heat insulating layer 110 and the heat shrinkable film 140 Shrinkage due to the thickness difference between the heat-shrinkable film 140 and the heat insulating layer 110 can be prevented in advance.

The heat shrinkable film 100 includes the heat insulating layer 110 and the heat shrinkable film 140 and has a shrinkage ratio in the main shrinking direction by heat of 15% or more, preferably 30% or more, Can have more than 50%. In addition, the shrinkage ratio with respect to the direction perpendicular to the main shrinkage direction of the heat shrinkable film 100 may be 5% or less.

In this case, the main shrinkage direction may be the width direction (TD), the longitudinal direction (MD) and the direction perpendicular to the main shrinkage direction may correspond to the longitudinal direction (MD) Direction.

The shrinkage refers to the heat shrinkage of the heat shrinkable film 100 and is defined by a rectangle having a size of 15 mm (MD) x 400 mm (TD) with respect to the longitudinal direction MD and the width direction MD of the heat shrinkable film 100 , And a solid line was drawn in the MD direction at both ends of the TD direction at both ends to form an effective measurement length of 300 mm. Using a tweezer or the like, a point within 50 mm from one end of the sample was gripped Was heat-shrunk for 10 seconds in a fully immersed state at 90 ° C ± 0.5 ° C in a hot water state, left for 1 minute at room temperature, and then measured for a reduced length at intervals of 300 mm in the TD direction indicated by an initial solid line, Shrinkage in the direction (TD) was obtained according to the following formula (2).

[Formula 2]

Shrinkage (%) = (300 mm-length after shrinkage) / 300 mm x 100

When the heat shrinkable film 100 is treated in hot water at 90 캜, if the shrinkage ratio with respect to the main shrinkage direction is less than 15%, the time required for shrinkage is prolonged, See FIG. 2). If the shrinkage ratio with respect to the main shrinkage direction is 90% or more, the air between the container 10 (see FIG. 2) and the heat shrinkable film 100 is difficult to escape due to a high shrinking speed, Can be reduced. The shrinkage rate range is determined by adhering the heat shrinkable film 100 to the container 10 (see FIG. 2) using an adhesive (not shown), collecting the bottles and recycling them, It is also advantageous in that it is easily peeled off even in the step of peeling the shrink film 100.

Fig. 2 is a view showing a heat-shrinkable film and a container according to one embodiment of the present invention, and Fig. 3 is a view showing a container insulated with a heat-shrinkable film according to one embodiment of the present invention.

The heat insulating shrinkable film 100 may be formed in the same manner as the container 10 to which the heat shrinkable film 100 of FIG. 3 is applied in the state of the container 10 before the heat insulating shrinkable film 100 of FIG. As a method applied to the container 10, there is a steam tunnel for heating and shrinking steam by a heating device called a shrink tunnel, and a hot wind tunnel for blowing hot air to heat shrink. As a method of heat shrinkage, a method using a steam tunnel or a method using a hot wind tunnel may be used, but the present invention is not limited thereto.

In an exemplary embodiment, in the steam tunnel, steam of about 0.5 to 20 MPa is passed for about 2 to 20 seconds at about 75 to 95 DEG C, steam is passed at about 120 to 200 DEG C for the hot wind tunnel and about 2 to 20 m / And the hot air is passed for about 2 to 20 seconds. Considering these conditions, it is possible to achieve a good shrink appearance under the shrinkage condition in which the heat shrinkable film 100 is within the above range.

In this case, the container 10 means a product for use in various applications such as an object storage, an object display, an object protection, and an object use, 10 may include, but not limited to, glass, plastic, metal materials, synthetic materials, and the like. Also, the shape of the container 10 is not limited to the shapes shown in Figs. 2 to 3.

The heat shrinkable film 100 may be applied to the container 10 in an amount proportional to the area of the portion to be insulated.

While the present invention has been particularly shown and described with reference to specific embodiments thereof, those skilled in the art will appreciate that such specific embodiments are merely preferred embodiments and that the scope of the present invention is not limited thereto will be. Accordingly, the actual scope of the present invention will be defined by the appended claims and their equivalents.

10: container
100: Heat shrinkable film
110: insulating layer
120: hollow bead
130: binder
140: Heat-shrinkable film

Claims (10)

A heat-shrinkable film comprising a heat-shrinkable film and a heat insulating layer,
Wherein the heat insulating layer comprises a hollow bead and a binder resin,
Wherein the heat shrinkable film has a shrinkage ratio with respect to the main shrinkage direction of 15% or more. The heat shrinkable film according to claim 1, wherein the hollow bead size of the heat insulating layer is 0.02 to 2.5 micrometers and the hollow ratio is 50 to 90%. The hollow bead according to claim 1, wherein the hollow bead is made of one or more materials selected from the group consisting of TEOS (tetraethylorthosilicate), phenyl silane, TMOS (tetramethyl orthosilicate), SiCl ₄ , Wherein the heat shrinkable film is made of a material. The heat-shrinkable film according to claim 2, wherein the thickness of the heat insulating layer is 0.5 to 10 micrometers. The resin composition according to claim 1, wherein the binder resin is selected from the group consisting of a polyolefin resin, a polyvinyl chloride resin, a polystyrene resin, a polyester resin, a polylactic acid resin, a polyurethane resin, a polycarbonate resin, A resin, and a resin. The heat shrinkable film according to claim 1, wherein the heat insulating layer comprises 1.5 to 50 parts by weight of the hollow beads based on 100 parts by weight of the binder resin. The heat-shrinkable film according to claim 1, wherein the heat-shrinkable film is a polyolefin-based heat-shrinkable film, a polyvinyl chloride-based heat-shrinkable film, a polystyrene-based heat-shrinkable film, a polyester- , A polycarbonate-based heat-shrinkable film, and a polyamide-based heat-shrinkable film. The heat-shrinkable film according to claim 1, wherein the thickness of the heat-shrinkable film is 10 to 150 micrometers. The heat-shrinkable film according to claim 1, wherein the shrinkage ratio of the heat-shrinkable film with respect to the direction perpendicular to the main shrinkage direction is 5% or less. A container insulated with the heat-shrinkable film according to any one of claims 1 to 10.

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