KR20100098888A - In-mold decoration label - Google Patents

In-mold decoration label Download PDF

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Publication number
KR20100098888A
KR20100098888A KR1020090017584A KR20090017584A KR20100098888A KR 20100098888 A KR20100098888 A KR 20100098888A KR 1020090017584 A KR1020090017584 A KR 1020090017584A KR 20090017584 A KR20090017584 A KR 20090017584A KR 20100098888 A KR20100098888 A KR 20100098888A
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KR
South Korea
Prior art keywords
label
thermoplastic polyurethane
mold
base film
weight
Prior art date
Application number
KR1020090017584A
Other languages
Korean (ko)
Inventor
송광석
Original Assignee
송광석
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 송광석 filed Critical 송광석
Priority to KR1020090017584A priority Critical patent/KR20100098888A/en
Publication of KR20100098888A publication Critical patent/KR20100098888A/en

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
    • B32B7/04—Interconnection of layers
    • B32B7/12—Interconnection of layers using interposed adhesives or interposed materials with bonding properties
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
    • G09F3/00—Labels, tag tickets, or similar identification or indication means; Seals; Postage or like stamps
    • G09F3/02—Forms or constructions
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
    • G09F3/00—Labels, tag tickets, or similar identification or indication means; Seals; Postage or like stamps
    • G09F3/02—Forms or constructions
    • G09F2003/0255—Forms or constructions laminated
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
    • G09F3/00—Labels, tag tickets, or similar identification or indication means; Seals; Postage or like stamps
    • G09F3/02—Forms or constructions
    • G09F2003/0264—Shapes or borders

Abstract

The present invention provides an in-mold label used for in-mold molding to which a label is attached simultaneously with container molding. In the in-mold label according to the present invention, the base film layer comprises a thermoplastic polyurethane and at least one polyolefin of polypropylene, polyethylene, and ultra low density polyolefin, and the adhesive layer comprises a thermoplastic polyurethane. In-mold label according to the invention is easy to insert into the mold, there is no blister generation, excellent adhesion to the molding container. In particular, the in-mold label of the present invention uses thermoplastic polyurethane in the base film layer and the adhesive layer, thereby improving heat resistance, transparency, and flexibility after molding, as well as strengthening the thermal adhesive force, thereby preventing defects in which the label does not adhere completely during molding. It can be minimized.

Description

In-mold Decoration Label}

The present invention relates to a label used for in-mold molding to which a label is attached at the same time as molding a container, and more particularly, a label including a printed matter is fixed in a mold, and a parison of molten thermoplastic resin ( Parison) is molded by inserting into a mold or a molten thermoplastic sheet is molded in a mold by a vacuum molding method or an air molding method, to a label used in the in-mold molding for producing a container with a label.

Conventionally labeled containers were formed by separately attaching labels printed by silk screen printing or other methods to resin molding containers such as detergents and various small and medium packaging containers. As such, when the label is attached after the container forming process, the labels may be adhered to each other in the process of transporting or storing the printed label to the container. In addition, there is a problem that a label does not adhere to the correct position of the container when the label is applied.

In addition, since the label must be attached separately, additional loading space, transportation cost, and labeling cost are required to move the container, and when the edge of the label is stuck or the label is not perfect, the label drops during distribution. Problems also arise.

In recent years, an in-mold molding system has been introduced to insert a label into a mold and attach a label at the same time as forming a container. However, since the label has a low flexibility and thermal adhesiveness, the label is not completely attached during molding. The problem does not occur.

In order to provide a useful label for an in-mold molding system to which a label is attached at the same time as the container is formed, the inventors have repeatedly conducted various studies and numerous tests to produce a bubble-free and fused label to a container with high strength.

Accordingly, an object of the present invention is to provide an in-mold label which is excellent in heat resistance, transparency and flexibility, and minimizes labeling defects during molding.

The in-mold label according to the embodiment of the present invention includes a base film layer and an adhesive layer formed on the base film layer.

The base film layer, and thermoplastic polyurethane (Thermoplastic Polyurethane); Polyolefins, polyethylenes, and ultra low density polyolefins. The ultra low density polyolefin is formed by adding and polymerizing a metallocene catalyst to propylene, ethylene or a monomer mixture thereof.

In an embodiment of the present invention, the adhesive layer may be made of a thermoplastic polyurethane. In addition, the adhesive layer may further include ethylene vinyl acetate (Ethlene-vinylacetate), polyethylene or a mixture thereof.

In an embodiment of the present invention, the base film layer, the thermoplastic polyurethane 1 to 30% by weight; 50 to 89 weight percent polyethylene; And 10 to 40% by weight polypropylene.

In an embodiment of the present invention, the adhesive layer, thermoplastic polyurethane 1 to 30% by weight; 10 to 30 weight percent polyethylene; And 60 to 89% by weight of ethylene vinyl acetate.

In an embodiment of the present invention, the polyol molecular weight of the thermoplastic polyurethane of the base film layer is 500 ~ 8,000, the glass transition temperature may be 150 ℃ or more.

In an embodiment of the present invention, the molecular weight of the prepolymer of the thermoplastic polyurethane of the adhesive layer is 20,000 ~ 30,000, the content of isocyanate (Isocyanate) may be 1.5% ~ 2.5%.

The in-mold label according to the present invention, as the base film layer contains at least one polyolefin of thermoplastic polyurethane and polypropylene, polyethylene and ultra low density polyolefin, improves heat resistance, transparency and flexibility, as well as improves the incidence of defects during in-molding. Can be reduced.

In addition, since the adhesive layer of the in-mold label according to the present invention contains a thermoplastic polyurethane, it is possible to minimize the defect that the label is not completely adhered after molding because the heat adhesion is weak during the molding process of the container.

In addition, since the label is attached at the same time as the container is formed, it reduces the loading space, transportation cost, and labeling cost required for moving the container caused by attaching the label separately. It is possible to prevent a problem in appearance quality of falling labels.

Hereinafter, each layer constituting the in-mold label according to the embodiment of the present invention will be described in detail.

1 is a cross-sectional view showing an in-mold label according to an embodiment of the present invention.

Referring to FIG. 1, an in-mold label according to an embodiment of the present invention includes a base film layer 10 and an adhesive layer 20 formed on a rear surface of the base film layer 10.

The base film layer 10 is a thermoplastic polyurethane (Thermoplastic Polyurethane); Polyolefins, polyethylenes, and ultra low density polyolefins.

The ultra low density polyolefin is prepared by adding and polymerizing a metallocene catalyst to propylene, polyethylene or a monomer mixture thereof. The ultra low density polyolefin may have a density of less than 0.910 g / cc, preferably in the range of 0.860 to 0.900 g / cc. The metallocene catalyst added to the polymerization of the ultra low density polyolefin is zirconocene + methylaluminoxane (MAO), Cp 2 ZrCl 2 + methylaluminum as a single-site catalyst. It is commonly used such as oxane (Methylaluminoxane, MAO).

All the resins constituting the base film layer 10, that is, thermoplastic polyurethane, and at least one polyolefin of polypropylene, polyethylene, and ultra low density polyolefin are 5 to 40 wt% based on the total components constituting the base film layer 10. Included in the scope. Therefore, when the content is less than 5% by weight, the flexibility is lowered, and when the content exceeds 40% by weight, a blocking phenomenon may occur in which the films are bonded to each other in the film manufacturing process.

In the embodiment of the present invention, the base film layer 10 may include 1 to 30% by weight of thermoplastic polyurethane, 50 to 89% by weight of polyethylene, and 10 to 40% by weight of polypropylene. In addition, the polyol molecular weight of the thermoplastic polyurethane constituting the base film layer 10 is 500 to 8,000, preferably 1,500 to 3,000, the glass transition temperature may be 150 ℃ or more.

The base film layer 10 is preferably formed to have a thickness in the range of 20 ~ 80㎛. If necessary, corona discharge treatment may be applied to the base film layer 10 to improve the printability of the surface of the base film layer 10.

The base film layer 10 of the present invention includes a thermoplastic polyurethane in the polyolefin, thereby improving heat resistance, transparency and flexibility after in-mold molding, and minimizing a defective rate after molding.

In the embodiment of the present invention, the adhesive layer 20 includes a thermoplastic polyurethane, or a thermoplastic polyurethane; It may comprise an ethylene vinyl acetate (Ethlene-vinylacetate), polyethylene (Polyethylene) or a mixture thereof.

The thermoplastic polyurethane serves to improve adhesion, heat resistance, durability and moisture resistance, and includes an isocyanate-based material and a glycol-based material. In particular, the isocyanate system reacts with many functional groups, so the effect of the universal adhesive is excellent. The thermoplastic polyurethane constituting the adhesive layer 20 may have a molecular weight of 20,000 to 30,000 and a content of isocyanate of 1.5% to 2.5% by weight of the prepolymer. By using a thermoplastic polyurethane resin having a molecular weight of 20,000 to 30,000 of the prepolymer, it is possible to improve performances such as paper feedability, insertability, etc., which are the main characteristics of the in-mold label, and to prevent the occurrence of blasting.

Ethylene vinyl acetate used in the adhesive layer 20 is a polyethylene resin-based polar copolymer, the content of vinyl acetate (Vinylacetate) is usually less than 40% by 10% to 33% by weight.

In the adhesive layer (20), the thermoplastic polyurethane alone or the thermoplastic polyurethane; Ethylene vinyl acetate, polyethylene or a mixture thereof may be included in the range of 45 to 90% by weight based on the total components constituting the adhesive layer 20. Therefore, when the content is less than 45% by weight, the adhesive force is lowered, and when contained in excess of 90% by weight, there is a problem that workability is lowered.

In an embodiment of the present invention, the adhesive layer 20 may include 1 to 30% by weight of the thermoplastic polyurethane, 10 to 30% by weight of polyethylene, and 60 to 89% by weight of ethylene vinyl acetate.

In an embodiment, the adhesive layer 20 is preferably formed to have a thickness of 8 ~ 20㎛. When the thickness of the adhesive layer 20 exceeds 20 μm, label curling may cause problems in offset printing and fixing the label to the mold.

In an embodiment of the present invention, the adhesive layer may further include an adhesive reinforcing agent (Tackifer) for imparting adhesive properties to the resin in addition to the resin such as thermoplastic polyurethane, ethylene vinyl acetate, polyethylene, wax and additives for adjusting the viscosity. have. In this case, additives of dyes, plasticizers, mold release agents, antioxidants, flame retardants, and ultraviolet absorbers may be added within a range that does not impair the required performance of the adhesive layer 20.

The adhesive layer of the present invention can improve the friction resistance as well as complement the adhesiveness, heat resistance, durability and moisture resistance of the label using a thermoplastic polyurethane. In addition, by providing elasticity and flexibility to the label, the in-mold label can be easily attached to the curved container.

The method of preparing the in-mold label of the present invention is not subject to any particular limitation, and may be selected and used from known methods conventionally applied in the art. For example, an inflation method, a thidie extrusion method, a micro gravure method, or the like can be used.

The in-mold label of the present invention may further include a print layer 30 together with the base film layer 10 and the adhesive layer 20. As shown in FIG. 1, the printed layer 30 may be provided on the opposite side of the base film layer 10 on which the adhesive layer 20 is formed, or may be provided between the base film layer and the adhesive layer. The printing of the print layer 30 may use a method such as gravure printing, offset printing, flexographic printing, screen printing, inkjet printing.

In-mold label according to an embodiment of the present invention is excellent in transparency and flexibility, excellent heat resistance and adhesion is suitable for various packaging containers by the in-mold molding method, for example, labels such as dish detergents, cosmetics, fabric softeners, etc. .

Hereinafter, the present invention will be described in more detail with reference to Examples and Test Examples. This embodiment is for the purpose of understanding the invention to the last, and is not intended to limit the scope of the invention in any form.

Example

(1) Preparation of In-Mold Label

A base film layer having a thickness of 70 μm was prepared by a Ti-die method by mixing 20 wt% of thermoplastic polyurethane, 50 wt% of polypropylene, and 30 wt% of polyethylene having a polyol molecular weight of 2,000 and a glass transition temperature of 150 ° C. or higher.

Then, the adhesive layer composition was prepared by mixing 10% by weight of thermoplastic polyurethane having a molecular weight of 25,000 and 2% of isocyanate, 65% by weight of ethylene vinyl acetate (20% by weight of vinyl acetate), 10% by weight of polyethylene, and 15% of wax. Was prepared, and coated on one side of the substrate film layer prepared above by a microgravure method to a thickness of 20㎛ to form an adhesive layer.

(2) molding of labeled containers

The in-mold label prepared in the above example was applied to a generally used in-mold molding machine to form a container with a label. The molding machine used here was a hollow molding machine with a screw Φ 90, melt-extruded at a molding temperature of 180 ° C., and supplied 4.5 kg / cm 2 of compressed air into a parison to inflate the parison and close the mold. It is formed into a container shape and fused with an in-mold label.

Comparative example

A low-density polyethylene (density 0.92 g / cm 2, molten resin 2) 20% by weight, polypropylene 50% by weight and polyethylene 30% by weight were mixed to prepare a base film layer having a thickness of 70 μm by a Ti die method. Then, 75% by weight of ethylene vinyl acetate (20% by weight of vinyl acetate), 10% by weight of polyethylene, and 15% of a wax were mixed to prepare an adhesive layer composition, and the microgravure method was applied to one side of the base film layer. Coating to 20㎛ thickness to form an adhesive layer to complete the in-mold label.

In addition, the in-mold label prepared in the comparative example was applied to the in-mold molding machine used in the above example to form a container with a label.

Test Example

For the in-mold label prepared by the above example and the in-mold label according to the comparative example, the following tests were carried out to check the adhesive strength, the paper feedability during printing, the insertability of the label, the occurrence of the blaster, and the like. The results are shown in Table 1.

(1) the adhesive strength of the label to the container;

The label fused to the container was cut to a width of 15 mm, and the adhesive strength between the label and the container was measured using a tensile tester. At this time, it peeled and measured by the pulling speed of 300 mm / min. If the measured value is usually 400 g / 15 mm or more, it was determined that there was no problem in use.

(2) Labeling suitability

Labels punched to a certain size were automatically fed with 100 labels in an air at a temperature of 25 ° C. and a relative humidity of 45% using an automatic label feeder to evaluate label insertion problems by observing label supply problems during molding. In general, if the label supply problem does not occur when 100 sheets of continuous feed was evaluated as the insertability of the label is excellent.

(3) Paper feedability at the time of printing

After printing to a paper size using a printer, continuous printing was carried out to observe the label feeding problem in the sheet feeder to evaluate the feedability during printing. That is, the relationship of the machine stoppage by the trouble in the sheet feeder was observed. Usually, when stopping 1 or 2 times or less at the time of 1,000 continuous printing, it evaluated as the paper feedability at the time of printing.

(4) Blaster occurrence

Blaster occurrence was evaluated by visual inspection.

(5) Defective rate compared to production

The flexibility, heat resistance, and adhesion of the label were visually observed for wrinkles, dropping, bubbles in the labeling portion after labeling, and the defect rate was measured to confirm the performance.

(6) Visual evaluation

The visual appearance of particles such as label appearance, pinhole, fisheye, and particles were visually evaluated based on 20 people.

TABLE 1

Evaluation items Example Comparative example Feedability at Printing Great usually Insertion suitability of label Great usually Blaster Outbreak none Occurs Adhesive strength to the container (g / 15mm) 750 500 % Defective compared to production Less than 1% 2% or more Visual evaluation Great Great Machinability good good

As shown in Table 1, the in-mold label according to an embodiment of the present invention can be seen that the product performance is superior to the in-mold label of the comparative example.

The in-mold label according to the embodiment of the present invention is excellent in the paper feedability and the workability in the cutting material during the printing process, it is easy to insert into the mold during the in-mold molding, it is possible to prevent and remove the blister (Blister) generation have. In addition, the in-mold label of the present invention can provide a label-labeled container having high adhesion between the container and the label because of excellent flexibility and adhesion.

In addition, the in-mold label according to the present invention can be confirmed that the productivity is significantly superior to the existing label.

1 is a cross-sectional view showing an in-mold label according to an embodiment of the present invention.

* Description of the symbols for the main parts of the drawings *

10: base film layer

20: adhesive layer

30: printing layer

Claims (7)

An in-mold label comprising a base film layer and an adhesive layer formed on the base film layer, The base film layer, and thermoplastic polyurethane (Thermoplastic Polyurethane); At least one of polypropylene, polyethylene and ultra low density polyolefin, The ultra low density polyolefin is an in-mold label, characterized in that the polymerization of propylene, ethylene or a monomer mixture thereof using a metallocene catalyst. The method of claim 1, In-mold label, characterized in that the adhesive layer comprises a thermoplastic polyurethane. 3. The method of claim 2, The adhesive layer is in-mold label, characterized in that further comprises ethylene vinyl acetate (Ethlene-vinylacetate), polyethylene or a mixture thereof. The method of claim 1, wherein the base film layer, 1 to 30% by weight thermoplastic polyurethane; 50 to 89 weight percent polyethylene; And 10 to 40% by weight of polypropylene. The method of claim 1, wherein the adhesive layer, 1 to 30% by weight thermoplastic polyurethane; 10 to 30 weight percent polyethylene; And 60 to 89% by weight of ethylene vinyl acetate. 5. The in-mold label according to claim 1, wherein the polyol molecular weight of the thermoplastic polyurethane of the base film layer is 500 to 8,000, and the glass transition temperature is 150 ° C. or higher. The in-mold label according to claim 2 or 5, wherein the molecular weight of the prepolymer of the thermoplastic polyurethane of the adhesive layer is 20,000 to 30,000, and the content of isocyanate is 1.5% to 2.5%.
KR1020090017584A 2009-03-02 2009-03-02 In-mold decoration label KR20100098888A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101421946B1 (en) * 2012-12-04 2014-07-22 현대자동차주식회사 Multi pattern implementation film for touch panel

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101421946B1 (en) * 2012-12-04 2014-07-22 현대자동차주식회사 Multi pattern implementation film for touch panel

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