KR101873520B1 - Multilayer polymer package material for packaging steel coil - Google Patents

Abstract

The present invention relates to a multi-layered polymer packing material for packing steel coils, and more particularly, to a multi-layered polymer packing material for packing steel coils, which comprises a core layer and a skin layer having a resin on both sides thereof, To a multilayer polymeric packaging material for packaging steel coils.
According to the present invention, a multilayer polymer packing material for packing steel coils according to the present invention is a packing material for steel coils for packing the outside of a steel coil so as to protect steel coils, comprising: a core layer formed in a sheet form; And a skin layer laminated on both sides of the core layer.

Description

[0001] MULTILAYER POLYMER PACKAGE MATERIAL FOR PACKAGING STEEL COIL [0002]

The present invention relates to a multi-layered polymer packing material for packing steel coils, and more particularly, to a multi-layered polymer packing material for packing steel coils, which comprises a core layer and a skin layer having a resin on both sides thereof, The present invention relates to a multilayer polymeric packaging material for packaging steel coils,

In general, steel products produced in steel mills are mainly shipped in the form of sheets or coils. The products shipped are rusted or corroded due to moisture or other impurity penetration during the transportation process such as loading or moving, In order to prevent damage such as scratches. When packing the above steel products, there are various packing specifications according to the basic packing specifications and the demands of the consumer according to the directions of demand such as products, domestic water or exports. Also, according to the packing specifications, Varies.

On the other hand, in steel products, many coil type steel coils are produced because of convenience of loading and transportation. In order to prevent damage to the external impact, steel coil uses packing ring such as plate or steel, Is installed on the inner periphery and the outer periphery of the rolled steel to prevent breakage of the rolled steel.

Conventionally, plastic, vinyl, cardboard, and iron packing materials are mostly used for packing steel coils. However, vinyl and cardboard in conventional packing materials are weak in strength and can not prevent damage to steel coils due to external impacts.

On the other hand, steel packaging materials are not only expensive but also have a high risk of safety accidents such as abrasions during packaging and dismantling. Recently, the use of plastic wrapping materials for steel coils has increased. Korean Patent Publication No. 10-2010-0069062 discloses a steel coil packing material made of plastic (HDPE, LDPE), and Korean Patent No. 10-0949060 (a polyethylene packing material for packing steel coils) ) Discloses a polyethylene steel coil packaging material, and Korean Patent No. 10-1212049 (a polymer resin packaging material for steel coil packaging) discloses a polyethylene, polypropylene, and EVA resin steel coil packaging material.

However, the conventional plastic packaging material for steel coil packaging has a problem of wrinkling due to the external environment (mainly heat) after packaging the product. Especially, in the case of steel coil products, there are many exports, and in case of passing through high temperature or Hanji during the export transportation, wrinkles easily occur due to heat deformation applied to the packaging material, and accordingly, there is a problem that the value of the product is lowered. FIG. 2 is a photograph showing a state where a steel coil packaging material of a conventional HDPE material is wrinkled due to thermal deformation. Referring to FIG. 2, it has been confirmed that the conventional HDPE steel coil packaging material significantly reduces the packaging quality due to the occurrence of wrinkles.

In addition, conventional plastic packaging materials for steel coil packaging are difficult to print and display in terms of product structure, such as product name and manufacturer name.

Korean Patent Publication No. 10-2010-0069062: Coil iron product packaging material and packaging method Korean Patent No. 10-0949060: Polyethylene packing for steel coil packing Korean Patent No. 10-1212049: Polymer resin packing material for steel coil packing

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and it is an object of the present invention to provide a core layer and a skin layer having a resin on both sides thereof, And a multilayer polymer packing material for packing a steel coil capable of forming a print layer.

According to an aspect of the present invention, there is provided a multi-layered polymer packing material for packing a steel coil, comprising: a core layer formed in a sheet shape; And a core layer formed on the outer surface of the skive layer, wherein the core layer and the skin layer are printed on at least one outer surface of the skin layer, .

The multi-layered polymer packing material for packing a steel coil according to the present invention is a packing material for a steel coil for packing the outside of a steel coil so as to protect the steel coil. The packing material comprises a core layer formed in a sheet form, Wherein at least one of the skin layers is formed in a transparent state and the inner surface of the transparent skin layer is printed to form a printed layer between the transparent skin layer and the core layer, The skin layer and the core layer are laminated together.

In the multilayer polymer packing material for packing steel coils according to the present invention, the core layer is formed in a sheet form with a core composition containing a thermoplastic synthetic rubber, and the skin layer is formed of a skin composition comprising an olefin resin .

In addition, the multilayer polymer packing material for packing steel coils according to the present invention is characterized in that the core composition is a mixture of thermoplastic synthetic rubber and calcium carbonate as a filler.

Also, the multilayer polymer packing material for packing steel coils according to the present invention is characterized in that the core composition is composed of 20 to 100% by weight of thermoplastic synthetic rubber and 0 to 80% by weight of calcium carbonate.

Also, the multilayer polymer packing material for packing steel coils according to the present invention is characterized in that the skin composition is a mixture of olefin resin and calcium carbonate as a filler.

Also, the multilayer polymer packing material for packing steel coils according to the present invention is characterized in that the skin composition is composed of 80 to 100% by weight of an olefin resin and 0 to 20% by weight of calcium carbonate.

In addition, the multilayer polymer packaging material for packing a steel coil according to the present invention is characterized in that the core layer is formed of a sheet-like woven fabric, and the skin layer is formed in a sheet form with a skin composition containing PVC.

The upper skin layer, which is one of the skin layers, is formed of a skin composition composed of a PVC resin, and the lower skin layer, which is another skin layer, is formed of a PVC resin, a TPE A resin, and a skin composition in which calcium carbonate is mixed with a filler.

The resin composition of the lower skin layer is composed of 10 to 80% by weight of a PVC resin, 10 to 20% by weight of a TPE resin and 0 to 80% by weight of calcium carbonate in a multilayer polymer packing material for packing a steel coil according to the present invention .

According to the above-described structure, the multilayer polymer packing material for packing a steel coil according to the present invention is formed into a structure having a core layer and a skin layer containing a resin on both sides thereof, so that the buffering effect is large and the wrinkles due to heat deformation are improved. And a printing layer can be formed.

1 is a cross-sectional view illustrating a multilayer polymer packing material for packing a steel coil according to an embodiment of the present invention;
FIG. 2 is a photograph showing a state in which a steel coil packing material of a conventional HDPE material is wrinkled due to thermal deformation
3 is a cross-sectional view illustrating a multilayer polymer packing material for packing steel coils according to another embodiment of the present invention
4 is a cross-sectional view illustrating a multilayer polymer packing material for packing a steel coil according to still another embodiment of the present invention

Hereinafter, the multilayer polymer packing material for packing a steel coil according to the present invention will be described in detail with reference to the drawings and examples.

1 is a cross-sectional view illustrating a multilayer polymer packing material for packing a steel coil according to an embodiment of the present invention. The present invention relates to a packaging material for a steel coil which covers the outside of a steel coil so as to protect a steel coil (not shown in the drawing), and a multilayer structure in which skin layers 21 and 22 are laminated on both sides of the core layer 10 .

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, a multilayer polymer packing material for packing a steel coil according to the present invention will be described in detail with reference to examples.

≪ Example 1 >

In the first embodiment of the present invention, the core layer 10 is formed of a core composition comprising a thermoplastic synthetic rubber, which is a plastic material that secures the elasticity of the packaging material, reduces the sensitivity to heat, and secures mechanical dimensional stability. .

In the first embodiment according to the present invention, the skin layers 21 and 22 laminated on both sides of the core layer 10 have hardness as a portion exposed on the surface of the packaging material and are resistant to thermal deformation, And an olefin resin which is a plastic material that can be used.

Particularly, the multilayer polymeric packing material for a steel coil according to the first embodiment of the present invention is formed by laminating the inner core layer and the outer skin layer with different materials so that the material of the inner core layer, which is not exposed to the outside, You can lower the price.

1. Material

The core layer is formed into a sheet form with the core composition. The core composition is a mixture of Thermo Plastic Elastomer (TPE) and calcium carbonate (CaCO ₃₎ as a filler. The thermoplastic synthetic rubber is mixed with 20 to 100% by weight of calcium carbonate and 0 to 80% by weight of calcium carbonate, By weight, 60% by weight of thermoplastic synthetic aphids and 40% by weight of calcium carbonate. Since the core layer plays the role of imparting the elasticity of the packaging material according to the present invention, when the calcium carbonate is added in an amount of 80% by weight or more, the elasticity is lowered. Therefore, in the case of the core layer, calcium carbonate is preferably 80% by weight or less. As the thermoplastic synthetic rubber, a thermoplastic polyurethane resin (TPU), a thermoplastic polyolefin resin (TPO), and an ethylene-vinyl acetate resin (EVA, ETHYLENE VINYL ACETATE) are used.

The skin layer is formed into a sheet form with a skin composition. The skin composition is a mixture of an olefin resin and calcium carbonate as a filler, wherein the olefin resin is mixed with 80 to 100% by weight of calcium carbonate and 0 to 20% by weight of calcium carbonate, preferably 90% by weight of an olefin resin, 10% by weight. As the olefin-based resin, a polypropylene resin (PP) or a polyethylene resin (PE) is used.

2. Product structure

As shown in FIG. 1, the multilayer polymer packing material for packing a steel coil according to the present invention has a structure in which skin layers 21 and 22 are laminated on both sides of a core layer 10. The entire packaging material has a thickness of 0.5 to 5.0 mm, wherein the thickness of the skin layer is 0.1 to 1.0 mm, and the thickness of the core layer is 0.3 to 4.8 mm.

3. Production method

(1) The first production method is a method in which the core layers 10 are subjected to T-die or calendering extrusion molding, and the skin layers 21 and 22 are laminated on both sides thereof with latent heat during core layer extrusion molding. The skin layers 21 and 22 are supplied to both sides of a core layer 10 which is extruded in a T-die or a calendar extrusion molding of the core layer 10 by a separate T-die or calender extrusion method, The skin layers 21 and 22 are laminated on both sides of the core layer 10 due to the latent heat of the molded core layer 10.

(2) In the second production method, the core layer 10 is extruded at the center with a triple-structure T-die, and the skin layers 21 and 22 are extruded at the top and bottom, And the skin layers 21 and 22 are laminated on both sides of the skin layer 10.

(3) In the third production method, the core layer 10 and the skin layers 21 and 22 are manufactured by a T-die method or a calendering method, and the produced core layer sheet and skin layer sheet are laminated with an embossing machine Method.

4. Shrinkage test

Table 1 below shows the HDPE packing material for conventional steel coil packing (control example) and the multilayer polymer packing material for packing steel coil according to the present invention in a 500 mm (width) x 500 mm (length) specimen and placed at a temperature of 90 ° C for 1 hour 400 mm (horizontal reference line) × 400 mm (vertical reference line). As a result, the shrinkage ratio of the multilayer polymer packaging material for the steel coil packaging according to the present invention was tested to be 0.0% and 0.2%, respectively, which were significantly improved compared with the shrinkage of 0.0% and 1.5%.

division Original HDPE Improvement 3LAYER Remarks Contraction ratio
(%) horizontal 0.0 0.0 Vertical -1.5 -0.2

* Shrinkage test (90 ℃)

5. Thermal Environment Cycle Test

Table 2 below shows the heat resistance of the conventional HDPE packaging material for steel coil packing (comparison example) and the multilayer polymer packing material for packing steel coil according to the present invention at 90 DEG C for 3 hours = > -40 DEG C for 3 hours => 50 DEG C for 70 hours The results are summarized as follows. As a result, wrinkles occurred in the conventional control examples, but wrinkles were not generated in the multilayer polymer packing material for the steel coil packaging according to the present invention.

≪ Example 2 >

The second embodiment of the present invention is characterized in that the core layer 10 is formed of a woven fabric that secures the strength of the packaging material, reduces sensitivity to heat, and secures mechanical dimensional stability.

In the second embodiment according to the present invention, the skin layers 21 and 22 laminated on both surfaces of the core layer 10 are exposed to the surface of the packaging material and are made of a PVC material And a resin.

Particularly, the multilayer polymeric packing material for a steel coil according to the first embodiment of the present invention is formed by laminating the inner core layer and the outer skin layer in different materials, thereby using the inner core layer which is not exposed to the outside as a woven fabric, And the skin layer is made of a PVC-based resin, so that the product price can be lowered.

1. Material

The core layer is formed of a woven fabric, and the skin layer is formed into a sheet form with a skin composition. The skin composition for forming the upper skin layer 21 is a composition made of a PVC resin, and the skin composition for forming the lower skin layer 22 is composed of a PVC resin, a TPE resin, Calcium. ≪ / RTI > The lower skin layer 22 is composed of 10 to 80% by weight of PVC resin, 10 to 20% by weight of TPE resin and 0 to 80% by weight of calcium carbonate, preferably 65% by weight of PVC resin, 15% by weight of TPE resin, And 20% by weight of calcium carbonate. As the TPE resin, a thermoplastic polyurethane resin (TPU), a thermoplastic polyolefin resin (TPO), and an ethylene-vinyl acetate resin (EVA, ETHYLENE VINYL ACETATE) are used.

2. Product structure

As shown in FIG. 1, the multi-layered polymer packing material for packing steel coil according to the present invention has a structure in which the upper skin layer 21 is laminated on the upper surface of the core layer 10 and the lower skin layer 22 is laminated on the lower surface. The thickness of the upper skin layer is 0.1 to 1.0 mm, the thickness of the lower skin layer is 0.4 to 4.9 mm, and the thickness of the core layer is 0.1 to 1.0 mm.

3. Production method

The upper skin layer 21 and the lower skin layer 22 are prepared in a calendering manner, and the prepared core layer sheet and skin layer sheet are laminated with an embossing machine.

≪ Example 3 >

3 is a cross-sectional view showing a multilayer polymer packing material for packing a steel coil in which a print layer 30 is formed on the surface of the upper skin layer 21. [

3, a multilayer polymer packing material for packing a steel coil according to a third embodiment of the present invention includes a core layer 10 having a top skin layer 21 formed on the top surface thereof and a bottom skin layer 22 laminated on the bottom surface thereof. The material, the product structure and the production method are the same as those of the first and second embodiments. However, the third embodiment is characterized in that the print layer 30 is formed on the outer surface of the upper skin layer 21 by gravure printing or the like, and then the upper skin layer 21 is bonded to the core layer.

<Example 4>

4 is a cross-sectional view showing a multilayer polymer packing material for packing a steel coil in which a printing layer 30 is formed between an upper skin layer 21 'and a core layer 10. [

4, the printing layer 30 is formed on the bottom surface of the upper skin layer 21 by gravure printing or the like, and the core layer 10 And the lower skin layer 22 is laminated on the lower surface. The upper skin layer 21 'is formed as a transparent layer so that the print layer 30 according to the fourth embodiment can be recognized from the outside through the upper skin layer 21'.

10 core layer
21, 21 ', 22 skin layer
30 Printed layer

Claims (10)

A packaging material for a steel coil for packing the outside of a steel coil to protect the steel coil,
A core layer formed in a sheet form, and a skin layer formed in a sheet form with a skin composition containing a resin and laminated on each of both surfaces of the core layer,
A printed layer is formed on the outer surface of the skin layer by printing on the outer surface of at least one of the skin layers and laminating the skin layer and the core layer,
Wherein the core layer is formed in a sheet form with a core composition comprising a thermoplastic synthetic rubber,
The skin layer is formed into a rolled sheet with a skin composition containing an olefin resin,
The core composition is mixed with 20 to 100% by weight of thermoplastic synthetic rubber and 0 to 80% by weight of calcium carbonate,
Wherein the skin composition is composed of 80 to 100% by weight of an olefin resin and 0 to 20% by weight of calcium carbonate. A packaging material for a steel coil for packing the outside of a steel coil to protect the steel coil,
A core layer formed in a sheet form, and a skin layer formed in a sheet form with a skin composition containing a resin and laminated on each of both surfaces of the core layer,
At least one of the skin layers is formed to be transparent,
Printing on the inner surface of the transparent skin layer and laminating the transparent skin layer and the core layer so that a printed layer is formed between the transparent skin layer and the core layer,
Wherein the core layer is formed in a sheet form with a core composition comprising a thermoplastic synthetic rubber,
The skin layer is formed into a rolled sheet with a skin composition containing an olefin resin,
The core composition is mixed with 20 to 100% by weight of thermoplastic synthetic rubber and 0 to 80% by weight of calcium carbonate,
Wherein the skin composition is a mixture of 80 to 100% by weight of an olefin resin and 0 to 20% by weight of calcium carbonate. delete delete delete delete delete A packaging material for a steel coil for packing the outside of a steel coil to protect the steel coil,
A core layer formed in a sheet form, and a skin layer formed in a sheet form with a skin composition containing a resin and laminated on each of both surfaces of the core layer,
A printed layer is formed on the outer surface of the skin layer by printing on the outer surface of at least one of the skin layers and laminating the skin layer and the core layer,
Wherein the core layer is formed of a sheet-like woven fabric, the skin layer is formed into a sheet form with a skin composition containing PVC,
The upper skin layer, which is one of the skin layers, is formed of a skin composition composed of PVC resin,
Wherein the lower skin layer, which is another one of the skin layers, is formed of a mixed resin composition comprising 10 to 80% by weight of a PVC resin, 10 to 20% by weight of a thermoplastic synthetic rubber (TPE resin) and 0 to 80% Multilayer polymer packaging for coil packaging. A packaging material for a steel coil for packing the outside of a steel coil to protect the steel coil,
A core layer formed in a sheet form, and a skin layer formed in a sheet form with a skin composition containing a resin and laminated on each of both surfaces of the core layer,
At least one of the skin layers is formed to be transparent,
Printing on the inner surface of the transparent skin layer and laminating the transparent skin layer and the core layer so that a printed layer is formed between the transparent skin layer and the core layer,
Wherein the core layer is formed of a sheet-like woven fabric, the skin layer is formed into a sheet form with a skin composition containing PVC,
The upper skin layer, which is one of the skin layers, is formed of a skin composition composed of PVC resin,
Wherein the lower skin layer, which is another one of the skin layers, is formed of a mixed resin composition comprising 10 to 80% by weight of a PVC resin, 10 to 20% by weight of a thermoplastic synthetic rubber (TPE resin) and 0 to 80% Multilayer polymer packaging for coil packaging. delete

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