JPH10161542A - Air permeable label - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an air permeable label which has no ruggedness on its label surface and is excellent in appearance without allowing air pools to be observed in labeling to integrate the label and a molding. SOLUTION: This label is formed by applying a film-like layer 10 consisting of a thermally fusible polymer formed by using at least single sight catalysts and a printing design layer 12 on the surface of this layer. A paper base material 16 for imparting rigidity or a base material 16a which is formed with through-microholes of 5 to 100μm in diameter and 5 to 10% in aperture density (rate) is disposed between the film-like layer 10 consisting of the thermally fusible polymer formed by using the single sight catalysts described above and the printing design layer 12 described above. The air permeability of the air permeable label 1 is >=50000cc/m<2> .24h.atm.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a label for displaying and decorating molded articles such as packaging containers and industrial materials, and more particularly to a label attached to three-dimensional objects such as plastic containers, paper containers and plastic molded articles. The present invention relates to a label to be attached and its configuration.

[0002]

2. Description of the Related Art Conventionally, as a container for storing liquid contents, powder contents, granular contents, etc., a blow molded container made of plastic, a stretch blow molded container, a carton container mainly made of paper, and the like are known. It is generally used in many cases, and the display or decorative pattern of the contents is generally made by attaching a label (labeling). As a general labeling method, a method of attaching a label with a display of contents or a decorative pattern on the front surface and an adhesive on the back surface to a plastic blow molding container etc. in a later process or when molding the container body Using the heat generated during container molding to integrate the container body with a label on which the contents are displayed or decorated on the front surface and a heat-fusible polymer is applied on the back surface (hereinafter referred to as insert molding). Labeling method).

[0003] In the above labeling, when a label surface becomes uneven due to an air layer or air pocket between a label and a molded product, or volatile vapor from an adhesive, or the label itself is transparent, In many cases, air pockets were observed, and there were many problems that appearance was inferior and the commercial value was reduced.

[0004]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems of the prior art, and an object of the present invention is to provide a labeling device for integrating a label and a molded product, wherein the label surface has irregularities. No air pocket is observed, that is, to provide a breathable label which is excellent in appearance.

[0005]

In order to achieve the above-mentioned object, the present invention relates to a film-like layer made of a heat-fusible polymer using at least a single-site catalyst and a film-like layer made of the same. This is a breathable label characterized by being provided with a printed pattern layer 12 on the surface.

According to the second aspect of the present invention, a paper base for imparting rigidity between the film-like layer 10 made of a heat-fusible polymer using the single-site catalyst and the printing pattern layer 12 is provided. This is a breathable label provided with a material 16.

According to the third aspect of the present invention, a diameter of 5 μm to 5 μm for imparting rigidity between the film layer 10 made of a heat-fusible polymer using the single-site catalyst and the printing pattern layer 12. This is a breathable label provided with a base material 16a provided with through-holes of 100 μm and an opening density (rate) of 5% to 20%.

Further, according to the invention of claim 4, the gas permeability of the gas permeable label 1 is 50000 cc / m ² · 24h.
-It is a breathable label that is atm or more.

[0009]

Embodiments of the present invention will be described below. As shown in FIG. 1, the air-permeable label of the present invention has at least a film-like layer (10) made of a heat-fusible polymer using a single-site catalyst and a printed pattern layer (1) on its surface.
(2) breathable label characterized by being subjected to (2)
And a film-like layer (1) made of a heat-fusible polymer using a single-site catalyst, if necessary.
0) is provided with a patterned adhesive layer (14) on the back surface.

The above-described single-site catalyst (a typical example is a metallocene catalyst, which comprises a metal compound coordinated with a cyclopentadiene ring and methylalkylsan)
Layer made of a heat-fusible polymer using
No. 0) has a higher gas permeability, and further improves gas permeability by forming a thinner layer. A printed pattern layer (12) on this surface can be used as a label. Things. However, in the case of the insert labeling method that uses heat during molding of a plastic molded container or the like to be transferred, and in the case of labeling in a later step using general pressure adhesion, etc., the heat using a single-site catalyst is used. An adhesive layer (14) is provided on the back surface of a film-like layer (10) made of a fusible polymer, and the adhesive layer (14) in this case is preferably formed in a pattern shape. Depending on the thickness of the agent layer (14) or the like, it may be applied on the entire surface and may be any as long as the gas permeability is not impaired.

Here, as the catalyst used in the polymerization of polyethylene or the like, the Ziegler catalyst and the Phillips catalyst are well-known as compared with the single-site catalyst. However, the gas permeability of the polyethylene layer using the Ziegler catalyst is almost zero. It was not equal. Therefore, in order to achieve the object of the present invention, it is significant that the main layer of the label is a film-like layer (10) made of a heat-fusible polymer using a gas-permeable single-site catalyst. is there.

As the heat-fusible polymer using a single-site catalyst, polyethylene resin, polypropylene resin, polystyrene resin, ethylene-styrene copolymer resin and the like can be used.

Next, as shown in FIG. 2, only the film-like layer (10) made of a heat-fusible polymer using a thin single-site catalyst lacks rigidity and takes into consideration the case of trouble in handling. A paper substrate (16) or a diameter for imparting rigidity between the film-like layer (10) made of a heat-fusible polymer using the single-site catalyst and the printing pattern layer (12). 5 μm to 10
A breathable label (1) provided with a substrate (16a) provided with through-holes of 0 μm, and a film-like layer made of a heat-fusible polymer using a single-site catalyst as required. The (10) surface is preferably provided with a patterned adhesive layer (14).

In this case, the paper base material (16) for imparting rigidity is a material that imparts rigidity and has a certain degree of gas permeability in order to provide handling properties in a printing process, adhesive application, labeling, and the like. It is a paper base material that can be used for relatively thin high-quality paper, art paper or coated manila, uncoated manila, coated ball, uncoated ball, etc., which is opaque and serves as a base material for reflective labels. .

The base material (16a) provided with through holes having a diameter of 5 μm to 100 μm for providing rigidity is the same as the paper base material (16) for providing rigidity. It is necessary to have a similar function, and has a thickness of 30 μm with through micropores having a diameter of 5 μm to 100 μm.
A stretched or unstretched film of polyethylene, polypropylene, polyester, or the like having a thickness of about μm, a composite material in which a filler is added to these polymers, or the like can be used. Polymer-impregnated paper or polymer-coated paper lacking gas permeability can also be used, but in this case, it becomes the base material of the opaque reflective label. The reason why the upper limit of the through-holes of the base material is set to 100 μm is that a limit is provided to such an extent that the fine holes of the label are not observed and the printed pattern is not difficult to see.

The paper base material (1) for imparting the above rigidity
6) Alternatively, as a method of forming a film-like layer (10) made of a heat-fusible polymer using a single-site catalyst on the back surface of a substrate (16a) provided with through-holes for imparting rigidity, extrusion is used. The use of the coating method is generally performed from the viewpoint of productivity and the like. However, in the case of a substrate having poor adhesion to a heat-fusible polymer using a single-site catalyst, that is, a substrate having poor adhesion, a substrate to which an adhesive has been applied in advance may be used.

Next, the gas permeable label (1) having a gas permeability of 50000 cc / m ² · 24 h · atm or more is used as the gas permeable label (1) of the present invention. ) To provide rigidity to be used for
It is necessary to select 6) and adjust the thickness of the film-like layer (10) made of a heat-fusible polymer using a single-site catalyst, the size of the through-holes, and the density. If the gas permeability is 10,000 cc / m ² · 24 h · atm or more, swelling due to the volatile vapor from the adhesive can be prevented, but 50,000 cc / m ² · 24 h · atm or more can effectively prevent gas accumulation. Is preferred.

The base material (16a) provided with through-holes for imparting rigidity can be formed on the base material by using sharp projections such as diamond needles. And the relationship with the opening diameter.

[0019]

Next, the present invention will be described in detail with reference to examples. <Example 1> Contents of a high-quality paper having a basis weight of 50 g / m ² as a paper base material (16) for imparting rigidity, and the display of contents and printing of a pattern were performed by an offset printing method. Polyethylene film-like layer (10) as a heat-sealable polymer using a 5 μm thick single-site catalyst on the printing surface)
Was formed by extrusion coating, and punched into a predetermined size to obtain a breathable label (1). The gas permeability of the obtained label was 100,000 cc / m ² · 24 h · atm. This label is placed in a blow molding mold in a film-like layer (1) made of a heat-fusible polymer using a single-site catalyst.
0) was placed on the side opposite to the mold side, and the label obtained above and the molded product (container) were integrated simultaneously with the blow molding. At this time, a polyethylene resin was used as a blow molding material, melt-extruded at 230 ° C., and a cylindrical molten parison was formed and blow-molded. The resulting labeled container is
The label surface had no irregularities and had an excellent appearance.

<Example 2> The surface of a polypropylene resin film having a thickness of 30 μm was subjected to a gravure printing method to display contents and a pattern, and the film was rolled with diamond needles to have an average diameter of 20 μm. Through-holes having an opening density (rate) of 8% were formed by pressure bonding. Further, a polyethylene resin film using a single-site catalyst having a thickness of 10 μm is bonded to the back surface (non-printing surface) of the film provided with printing and through-holes by heat fusion, and punched into a predetermined size to form a breathable label ( 1). The gas permeability of this label was 200000 cc / m ² · 24 h · atm. Next, this label is placed in a blow-molding mold with the film-like layer (10) made of a heat-fusible polymer using a single-site catalyst as the anti-mold side, and is obtained simultaneously with blow molding. Label and the molded product (container). At this time, a random polypropylene resin was used as a blow molding material, melt-extruded at 240 ° C., and a cylindrical molten parison was formed and blow-molded. The obtained labeled container had excellent transparency, had no irregularities on the label surface, and had an excellent appearance without gas accumulation between the label back surface and the molded product (container).

Comparative Example 1 In place of the heat-fusible polyethylene resin using a single-site catalyst in Example 1,
A label was obtained by the same method and material as in Example 1, except that a heat-fusible polyethylene resin using a Ziegler catalyst was used. Gas permeability of the label, 5000cc / m ² · 24
h · atm. Example 1 using the obtained label
A container with a label was obtained in the same manner as described above. The resulting container had irregularities due to gas accumulation on the label surface, which was unfavorable in appearance and impaired commercial value.

<Comparative Example 2> A stretched polypropylene resin film having a thickness of 30 μm was used as a base material for imparting rigidity, and the surface of the base material was subjected to a gravure printing method to display the contents and print a picture, and the back surface (non- A 10 μm-thick polypropylene resin layer was formed on the printed surface by laminating. The gas permeability of the obtained laminated film is 100 cc / m ² · 24 h · atm
Met. The film was stamped into a predetermined size to form a label. The obtained label was placed in a blow molding die with the polypropylene resin film layer facing the opposite side of the die, and the label obtained above and the molded product (container) were integrated simultaneously with the blow molding. At this time, a random polypropylene resin was used as a blow molding material at 240 ° C.
, And a cylindrical molten parison was molded and blow molded. Although the obtained labeled container is excellent in transparency, it has irregularities on the label surface, and gas accumulation is observed between the label back surface and the molded product (container), so that it cannot be said that the container is excellent in appearance. , Which impaired the commercial value.

[0023]

As described above, the breathable label of the present invention is
Since it is composed of a film layer made of a heat-fusible polymer using a single-site catalyst and a printed pattern layer, there is no unevenness on the label surface and there is no gas accumulation between the label back surface and the molded product (container). A molded article (container) with a label which is excellent in appearance can be obtained.

Further, the air-permeable label of the present invention comprises a paper substrate for imparting rigidity between the film-like layer made of a heat-fusible pomer using the single-site catalyst and the printing pattern layer. Because it is a configuration that is provided, it is excellent in handling with a label ring etc., and there is no unevenness on the label surface,
A molded article (container) with a label, which is excellent in appearance and has no gas accumulation between the back surface of the label and the molded article (container), can be obtained.

The air-permeable label of the present invention has a diameter of 5 μm to 100 μm for providing rigidity between the film-like layer made of a heat-fusible pomer using the single-site catalyst and the printing pattern layer. Opening density (rate) 5% to 20%
As described above, the substrate is provided with a base material provided with through-holes, so it is excellent in handling with a label ring and the like, has no irregularities on the label surface, and has a flat surface between the label back surface and the molded product (container). A molded product (container) with a label which is excellent in appearance and has no gas stagnation in between can be obtained.

Furthermore, since the gas permeable label of the present invention has a gas permeability of 50,000 cc / m ² · 24 h · atm or more, there is no irregularity on the label surface, and the label back surface and the molded product (container) ), A molded article (container) with a label, which is excellent in appearance and has no gas pool.

[Brief description of the drawings]

FIG. 1 is an explanatory view showing an example of the present invention in a side cross section.

FIG. 2 is an explanatory view showing another example of the present invention in a side cross section.

[Explanation of symbols]

1} Air-permeable label 10} Film-like layer made of heat-fusible polymer using single-site catalyst 12} Print pattern layer 14} Adhesive layer 16} Paper substrate for imparting rigidity 16a substrate with perforated micropores to provide rigidity

Continuation of front page (72) Inventor Nobuo Furusawa 1-5-1, Taito, Taito-ku, Tokyo Letterpress Printing Co., Ltd.

Claims (4)

[Claims] 1. A gas-permeable label comprising a film layer 10 made of a heat-fusible polymer using at least a single-site catalyst and a printed pattern layer 12 provided on the surface thereof. 2. A film-like layer 10 made of a heat-fusible polymer using the single-site catalyst;
2. The breathable label according to claim 1, further comprising a paper base material 16 for imparting rigidity between the label and the base material. 3. A film layer 10 made of a heat-fusible polymer using the single-site catalyst, and the printed pattern layer 1
2 to 5μm to 100μ for providing rigidity
2. The breathable label according to claim 1, further comprising a substrate 16a provided with through-holes having a diameter of m and an opening density (ratio) of 5% to 20%. 4. The gas permeable label 1 has a gas permeability of 50.
The air-permeable label according to claim 1, 2 or 3, wherein the air-permeable label is at least 000 cc / m ² · 24h · atm.