KR940005158B1 - Label - Google Patents

Abstract

The label for blow molding is composed of the adhesive layer (2) on one surface of the base layer (1), and the adhesive layer (2) comprising hot melt adhesive comprises the thick layer (3) having thick projected parts (4) and the thin layer (5) having the thin depressed parts (6). The label is produced by: coating an adhesive agent on one surface of the base sheet; forming # pattern on the thin layer using an embosing roller having # phase pattern projected parts and the press.

Description

Blow Molding Labels

1 is a cross-sectional view of a label according to the present invention.

2 is a cross-sectional view showing a state attached to the molding of the label according to the present invention.

3 is a cross-sectional view of a label having a conventional vent.

Figure 4 is a cross-sectional view of the adhesive structure showing a conventional label attached state.

* Explanation of symbols for main parts of the drawings

1: Label holder 2: Adhesive layer

3: thick film layer 4: protrusions

5: thin film layer 6: groove

The present invention relates to a blow molding label (Lable) formed by forming a hot-melt adhesive layer on the molding on one surface of the printed label of the label or pattern, but forming a groove communicating from side to side consisting of a thin layer of adhesive on the adhesive layer. .

As a method of displaying letters or patterns, such as trademarks, on the surface of synthetic resin products, there are methods of directly printing trademarks on the surface of finished synthetic resin products and transferring them to the surface of the product by using a transfer paper on which trademarks are printed. Recently, a method has been known in which a label is printed on a surface of a product at the same time as the product is molded by pre-positioning and forming a product in a mold when the synthetic resin product is molded.

In the method of displaying the trademark on the surface of the synthetic resin product, the method of directly printing or transferring the trademark on the surface of the finished product, or bonding the label on which the trademark is printed, may cause the printing layer or label layer of the trademark to protrude from the surface of the product. There is a problem in that the label is attached to the surface of the product when the product is molded.However, the letters such as the trademark or the label itself do not protrude to the surface, but the labels are not separated one by one when using the automatic adsorber that supports the label in the mold for blow molding. There is no problem, there is a problem that the bubble is formed on the adhesive surface is not complete adhesion.

Japanese Laid-Open Utility Model Publication No. 55-20533 discloses an adhesive part and an adhesive that adheres between a product and a label when a label made of a non-breathable material attached to the product is attached to the surface of a finished product. Techniques for attaching to form an adhesive structure consisting of a cutout for bubble free lattice have been disclosed. According to the above-mentioned literature, the above-described adhesive structure is described by a method of applying an adhesive to a label with a rubber roller having a lattice groove formed thereon and attaching it to the outer circumferential surface of the product. However, the aforementioned Japanese patent document does not describe the method of using the above-described adhesive structure in the blow molded article, nor does it describe the kind of the adhesive.

In the above-described conventional label, as shown in FIG. 3, the adhesive coating portion (b) and the lattice-type adhesive non-coating portion (c) are formed on the back surface of the label holder (a), so that the adhesive as shown in FIG. In the uncoated portion (c), the adhesion with the product (d) is no longer achieved. The structure of the adhesive part is a structure that appears when the adhesive is applied by using an adhesive coating machine having a lattice groove on the surface, and has an effect of preventing bubbles from forming on the adhesive surface during the adhesive work, but the front of the label does not adhere to the product. Since the non-adhesive portion is present in the adhesive portion without the complete adhesion between the label and the product does not appear. For example, if the label is weak in water, such as a label made of paper, if water penetrates between the label and the product, the paper may absorb the water and cause the label to fall off. Since water penetrates through the adhesive interface, the front surface should be adhered by a waterproof adhesive, but according to the above-mentioned publication, the non-bonded portion is formed, which causes a problem of easily penetrating water.

In order to make the label applied with adhesive only to a part of the surface to be completely adhered to the surface of the product, as in the above-mentioned Utility Model Publication, the label is pressed against the surface of the product and the adhesive spreads to the uncoated portion, Should be asked. However, when the adhesive is applied to a label and then applied to a product before curing, as in the above-mentioned published utility model publication, the adhesive easily spreads to the side with a slight pressure, so that the entire adhesive is possible over the entire surface, but as with a hot melt adhesive In the case of the adhesive glued under the heating conditions, it is necessary to apply a label on the surface of the product and heat-compress it. At this time, a problem of deformation of the product itself, which is weak to heat such as plastic, appears, and thus, the above-described adhesive technique cannot be used by the thermoplastic product.

In particular, when the label is attached at the same time as blow molding, the pressure that the adhesive spreads to the side is not applied to the label, so the non-adhesive part is not adhered to the product, and the non-adhesive part remains between the label and the adhesive.

Moreover, in order to support the label in the blow molding mold when plastic products are blow molded, and to ensure that the label is supported on the surface of the product at the same time as the blow molding, the labels are separated from the labels stacked by the automatic adsorption device and put into the blow molding mold. If the adhesive is applied to the entire surface of the label, one or more of the labels may be separated. In addition, when the label is made of a heat-resistant synthetic film, the front side of the label comes into contact with the blown high-temperature blown melt, which causes the label to deform.

Therefore, the label for blow molding which should use an automatic adsorber is to make the label separate evenly, so that the label adheres uniformly to the entire surface of the blow molded product.

It is an object of the present invention to provide a label which is separated from each other during blow molding of a synthetic resin product such that the entire surface of the label and the surface of the product are adhered by an adhesive.

The object of the present invention described above is achieved by applying a hot melt adhesive to the front side of a label such that the adhesive layer consists of a thick thick layer and a lattice-like thin film layer.

The present invention is a label having an adhesive layer on the back surface, wherein the adhesive layer is formed of a hot melt adhesive, but the adhesive layer is a groove that is connected to the left and right grooves constituting a thick thin film layer and the protrusion forming a thick thick film layer. It consists of a blow molding label.

The adhesive layer on the surface of the label according to the present invention is formed by using an embossing roller or a pressing plate such as a pressure plate having a # -shaped pattern on the surface, for example, before the adhesive is applied to the front of the label to a certain thickness and then completely solidified. It can be easily formed by passing through an embossing roller having a # -shaped protruding pattern or by pressing with a pressure plate to form a groove that becomes an adhesive layer of a thin film.

The adhesive layer of the label according to the present invention is formed to a thickness of 2-20μm, the adhesive thickness of the groove is preferably formed to be in the range of 1-15μm. Therefore, the embossing roller or pattern plate should be installed to maintain a constant distance from the label surface so that the adhesive thin film of the required thickness remains in the recessed portion without directly contacting the label when forming the pattern.

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

1 and 2 are for explaining the label of the present invention, the adhesive layer 2 is formed on the surface of the label holder (1). This adhesive layer 2 consists of the thick film layer 3 which comprises the thick protrusion 4, and the thin film layer 5 which communicates to the left and right which comprises the recess 6. As shown in FIG.

When blow molding the synthetic resin melt in the label-supported mold, the injected synthetic resin melt flows into the groove 6 and the adhesive of the thin film layer 5 in the groove 6 contacts the surface of the molding as shown in FIG. Since the contact is made while the thick film layer 3 of the protrusion 4 as well as the thin film layer 6 of the groove 6 is also bonded to the molded article so that the front surface of the label is in contact with the molded article 7.

In the present invention, a label or a label on which a pattern is printed may be used as a tributary synthetic resin film, a nonwoven fabric, a diffuser, and the like may be transparent, translucent or opaque.

The adhesive layer of the present invention is preferably formed on the back side of the substrate, that is, on the opposite side of the printing layer, but may be formed on the surface of the printing layer depending on the type and use of the molding. In this case, the contact agent does not damage the printing layer. Should be used.

In the present invention, the groove formed in the adhesive layer should be formed to extend to the left and right edges of the label while communicating from side to side. The most suitable shape of these grooves is to form a # -shape or ridge.

The adhesive used in the present invention uses a hot melt adhesive according to the material of the molding.

When the molded material is polyethylene or polypropylene, low density polyethylene (molecular weight 12,000-23,000, melt index 5-7) is used as the adhesive. However, in order to lower the melting point of the adhesive and improve the adhesion, at least one selected from modified rosin ester resin, hydrogenated hydrocarbon resin, and ethylene vinyl acetate copolymer in 100 parts by weight of polyethylene is used. You may mix and use up to 15 weight part. In particular, hydrogenated hydrocarbon resins include the ESCORES 5000 series from Exxon Chemical, which has excellent usability with polyethylene to improve adhesion to moldings. The above-mentioned modified rosin ester resin, hydrogenated hydrocarbon resin and ethylene vinyl acetate copolymer may be used by mixing only one of them with low density polyethylene, or 100 parts by weight of low density polyethylene resin when two or more types are mixed with low density polyethylene. The mixing ratio can be arbitrarily determined in a range not to exceed 15 parts by weight. However, if the total amount exceeds 15 parts by weight, it is difficult to treat it as sticky and should be used below 15 parts by weight. In addition, since the ethylene vinyl acetate copolymer increases the flexibility of the adhesive, it is preferable to increase the blending amount when the molded article is a flexible article. And the modified rosin ester resin serves to improve the instantaneous adhesion than when using a low-density polyethylene resin alone.

In the case where the molding is a polyester resin, one or two selected from modified rosin ester resins, petroleum resins, and hydrogenated hydrocarbon resins for inducing instantaneous adhesion with distearoylethylenediamine to the ethylene / methylacrylate copolymer. Adhesive compositions containing a mixture of species can be used. In addition, hot melt adhesives based on polyamide polyurethane and ethylene vinyl acetate are also usefully used in the present invention.

Ethylene / methylacrylate used in the present invention has a methyl acrylate content of 6-30%, in particular 20%, a melt index of about 135 g / 10 min, a "bisamide" with a melting point of 118-120 ° C., an acid value of 10 and a molecular weight of 270. You may use what is marketed by Korean Lion Chemical under the brand name.

The adhesive composition described above is 20-60 parts by weight of one or two selected from modified rosin esters, petroleum resins, and hydrated hydrocarbon resins, based on 100 parts by weight of ethylene / methyl acrylate, distearoylethylenediamine 2-10. It mix | blends in ratio of a weight part and apply | coats, hot-melting. If necessary, 100-200 parts by weight of an organic solvent, especially toluene, may be added to the adhesive composition described above, and then heated and dissolved at 50-70 ° C. and applied to a label coat with reverse cota or by silkscreen printing.

In addition, according to the present invention, a known hot melt adhesive based on polyamide, ethylene vinyl acetate copolymer, polyurethane, or the like may be used as the adhesive, but such an adhesive is not preferable because of its high transparency and high cost.

The label of the present invention described above is fixed to the surface of the adhesive layer on the inner surface of the mold for blow molding, and blow molding by injecting a synthetic resin by a known method to form the molded article and simultaneously attach the label to the surface of the molded article. It will be fixed.

The label according to the present invention is adhesively applied to the entire surface of the label to prevent the formation of air sacs while adhering without gaps on the surface of the molding and also to easily separate the labels one by one when using an automatic adsorber to support the blow molding mold. Therefore, it can be usefully used at the time of blow molding.

According to the label of the present invention, since the adhesive is adhered to the molding before the molding is solidified, the thermal bonding occurs at the same time as the adhesive is formed, so that the adhesive layer of the molding and the label is integrated, so that the label does not fall off from the surface of the molding, and the upper and lower sides of the adhesive layer of the label The grooves are formed to communicate with each other so that the air remaining in the center of the contact surface of the label and the molded product escapes into the groove during the molding process, so that no air sacs are formed between the label and the molded surface.

In particular, the adhesive used in the label of the present invention is excellent in adhesive strength with the molding and use the compatibility, so that when the label is made of the same synthetic film as the molding can be recycled without removing the label when recycling the waste.

Example 1

Preparation of labels for polyethylene moldings

Heat-melt low-density polyethylene (MI: 5-7, molecular weight 12,000-23,000) to 220 ° C and laminate it to a thickness of 10 μm on one side of the paper label to form an adhesive layer and pass through an embossed roller with a # -shaped protrusion To form a groove consisting of a 100-mesh # -shaped groove in the adhesive layer.

Example 2

Preparation of labels for polyethylene moldings

The adhesive of the method of Example 1 was used but 15 parts by weight of the modified rosin ester having a melting point of 95-115 ° C. was added to 100 parts by weight of low density polyethylene.

Example 3

Using the method of Example 1, but using a mixture of 5 parts by weight of modified rosin ester, 5 parts by petroleum resin and 5 parts by weight of hydrogenated hydrocarbon resin to 100 parts by weight of low-density polyethylene.

Example 4

Preparation of Labels for Polyester Resin Molded Products

Ethylene / methyl acrylate copolymer (methyl acrylate content 6-30%, melting point 65-100 ℃ 100 parts by weight, modified rosin ester (melting point 90-115 ℃, acid value 10, molecular weight 270) and distearoyl 10 parts by weight of ethylene pyamine is mixed and melted at 125 ° C., laminated on a label, to form an adhesive layer, and a pattern plate having a # -shaped protruding pattern is pressed by a press to form a # -shaped groove in the adhesive layer.

Example 5

Labels for Polypropylene Resin Moldings

100 parts by weight of toluene is added to 160 parts by weight of the adhesive composition of Example 4, which is melted at 60 ° C., coated on a label element with a reverse coder, and an air passage is formed with an embossing roller before it is completely dried.

Claims (2)

In a label having an adhesive layer 2 on one side of the substrate 1, the adhesive layer 2 is composed of a hot melt adhesive, the adhesive layer 2 being a thick film forming a protrusion 4 thick in thickness. A label for blow molding, characterized in that it consists of a layer (3) and a thin film layer (5) forming a thin groove (6). Apply adhesive on one side of the label body and press the embossing roller with a # -shaped protrusion on the surface and press plate to press the protrusion surface of the press to maintain a constant distance from the surface of the label. Label manufacturing method for forming a thin film layer.

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