KR20180113112A - A laminated material for food package and food package therefrom - Google Patents

Abstract

The present application relates to a sequential printed film for packaging. Specifically, the present application relates to a laminated material for food packaging, which comprises: a substrate layer; one or more resin layers formed on one surface of the substrate layer; and a sealant layer formed on one surface of the resin layer, wherein a white layer and a pattern layer are printed on the substrate layer between the substrate layer and the resin layer, and a shielding printed layer in which a white layer and a colored layer are printed on an upper surface or a lower surface of the resin layer is formed, so that excellent coloring can be realized while giving excellent shielding power without using an aluminum raw material, and it is effective to prevent delamination and odor of the packaging material by laminating laminated layers of the white layer and colored layer.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a laminated material for food packaging,

The present invention relates to a laminate for food packaging and a food packaging material produced using the laminate for food packaging, and more particularly, to a laminate for food packaging, which is excellent in shielding power and capable of exhibiting excellent color even without containing aluminum foil or aluminum vapor deposition layer, Food packaging materials.

A pouch-type packaging material containing various solid matters or liquid products such as food and beverages, liquid detergents and the like contains a laminated material containing an aluminum foil or an aluminum vapor-deposited layer in order to prevent the content from deteriorating due to oxygen permeation or light- .

For example, Korean Utility Model Registration No. 20-0187896, published in Korea, discloses a packaging material for retort comprising an aluminum vapor deposition layer.

In the case of the food packaging material including the aluminum foil or the aluminum vapor deposition layer, the oxygen permeation and the light are completely cut off, but the preservation property is excellent. However, the incineration is difficult because of the environmental problem and the heating by the microwave oven is practically impossible .

In order to solve such a problem, in recent years, a light shielding printing layer including a high-concentration white pigment is formed on one surface of a base material layer of a packaging material not including an aluminum foil or an aluminum vapor deposition layer, Food packaging materials that can be heated using a range have been developed.

However, since the light-shielding printing layer is formed on one surface of the food packaging material including the light-shielding printing layer as described above, the printing frequency usable for printing the pattern layer on the substrate layer is reduced and the printing quality is deteriorated. There is a problem in that it is difficult to realize an appropriate shielding force when the quality of printing is maintained.

Korean Utility Model Registration No. 20-0187896 (Apr. 21, 2000)

The present application has been made to solve the above problems and it is an object of the present invention to provide an aluminum foil and aluminum vapor deposition layer which can be heated by using a microwave oven without having an aluminum foil or an aluminum vapor deposition layer, It is an object of the present invention to provide a laminated material for food packaging.

It is another object of the present invention to provide a food packaging material made of the laminate for food packaging.

In order to achieve the above-mentioned object, the present application has been made to provide a base layer, at least one resin layer formed on the lower surface of the base layer, and a sealant layer formed on the upper or lower surface of the resin layer, Layer is successively printed and the colored layer and the white layer are sequentially printed on the upper surface of the resin layer.

The present application also provides a food packaging material produced using the above-described food packaging laminate.

The laminated material for food packaging of the present application and the food packaging material manufactured using the same can be heated using a microwave oven even in a packaged state without using aluminum and can have a shielding property equivalent to that of using aluminum, The printing frequency is not significantly reduced and the printing quality of the pattern layer can be maintained.

Fig. 1 shows an example of a laminate for food packaging according to the present application.
Fig. 2 shows a conventional or conventional laminate of Comparative Example 1. Fig.
3 shows a conventional shielded printing laminate of Comparative Example 2. Fig.
Fig. 4 shows the laminate for food packaging according to the present invention described in Production Example 1. Fig.
Fig. 5 is a photograph showing a comparison of the color feeling of the food packaging material described in Experimental Example 3, Fig. 5 (a) showing the conventional laminated structure of Comparative Example 1, and Fig. 5 And Fig. 5 (c) shows a conventional shielded printed laminated material composition of Comparative Example 2. Fig.
Fig. 6 is a photograph showing a comparison of the color of the food packaging material described in Experimental Example 3 in close proximity. From the left, the conventional laminated material of Comparative Example 1, the laminate for food packaging of the present application of Production Example 1, Printed laminated material.

The present application will be described in detail below.

The present application is based on the idea that a base layer, at least one resin layer formed on a lower surface of the base layer, and a sealant layer formed on a lower surface of the resin layer, wherein the base layer has a pattern layer and a white layer sequentially printed thereon, The resin layer is formed by sequentially printing a colored layer and a white layer on an upper surface thereof (refer to Fig. 1).

The base layer may be a transparent film having a high mechanical strength as a portion serving as a surface of a food packaging material. Specifically, it may be one selected from a polyethylene terephthalate (PET) film, a polypropylene (PP) film, and a polyamide (PA) film. Preferably, polyethylene terephthalate which is excellent in mechanical strength and excellent in crack resistance and heat resistance can be used, but is not limited thereto.

Alternatively, an inorganic oxide such as aluminum oxide or silicon oxide may be deposited on one side of the substrate layer, or a transparent film of the above material may be coated with a gas barrier coating agent, or an ethylene vinyl alcohol (EVOH) film , A polyvinylidene chloride (PVDC) film may be used to further block oxygen transmission.

The base layer may have a thickness of 10 to 30 탆, specifically 12 to 25 탆. If it is less than 10 mu m, durability becomes a problem. If it exceeds 30 mu m, process economics and ease of operation are inferior.

The resin layer may be formed on the lower surface of the base layer and may be formed of one or more. It is preferable that the resin layer is formed of a resin that is positioned between the base layer and the sealant layer and can improve shock absorption upon external impact of the food packaging material. Specifically, it may be one selected from nylon (NY), polyethylene terephthalate (PET) film, polypropylene (PP) film and polyamide (PA) film. Preferably, a polyamide film excellent in impact absorbability can be used, but the present invention is not limited thereto.

Alternatively, a transparent film made of the above material in which an inorganic oxide such as aluminum oxide or silicon oxide is deposited on the surface of the resin layer or a gas barrier coating agent is applied, or an ethylene vinyl alcohol (EVOH) film , A polyvinylidene chloride (PVDC) film may be used to further block oxygen transmission.

The resin layer may have a thickness of 10 to 30 탆, specifically 12 to 25 탆. When the thickness is less than 10 mu m, the impact absorbing property is deteriorated. When the thickness exceeds 30 mu m, the thickness of the packaging material becomes thick.

The sealant layer is formed on the lower surface of the resin layer and imparts heat resistance to the laminate for food packaging. Specifically, the laminate for food packaging can be made into a food packaging material by heat sealing the corner portion with the sealant layer facing the other. The sealant layer may be made of a thermoplastic resin. As the thermoplastic resin, a known resin can be used, and specifically, a polyethylene, a polypropylene, and an olefin-based copolymer can be used, and a heat-resistant, non-lead-free polypropylene (RCPP) can be used.

The sealant layer is preferably 30 to 100 mu m. When the thickness is less than 30 mu m, heat sealing is not performed, while when the thickness is more than 100 mu m, the process economical efficiency and the working time of heat sealing become long.

The base layer may be formed by sequentially printing a pattern layer and a white layer on the lower surface, and the resin layer may be formed by sequentially printing a colored layer and a white layer on the upper or lower surface. There has been a problem in that all the shielding printed layers are printed on the base layer so that the print quality of the base layer is deteriorated due to the decrease in the printing degree of the base layer. In addition, there was a problem of delamination and odor generated in the ink paint when lamination of the abdomen color was progressed in the laminating process after the printing of the packaging material. However, in the shielded printing layer of the present application, the white layer and the pattern layer are printed on the base layer and the white layer and the colored layer are printed on the resin layer to overcome the decrease in the printing degree of the base layer to improve the printing quality, I could solve the problem.

The white layer and the colored layer may be printed. Solid printing refers to printing that completely covers the entire printed surface without any shading, contrast, or highlighting of the printed surface, ie, printing the front without blanks and without voids. do. The printing may be performed by a known printing method, and specifically, it may be gravure printing, flexographic printing, or offset printing, but is not limited thereto.

The pattern layer may be formed by printing a pattern ink containing various pigments on the bottom surface of the substrate layer according to a desired pattern.

The white layer can be formed by printing a known white pigment with a white ink containing known additives and a solvent. Specifically, a white pigment is contained in an amount of 30 to 50% by weight, a polyethylene resin for dispersibility of 3 to 6% by weight, a polyurethane resin for adhesion of 13 to 23% by weight and a polyethylene wax for abrasion resistance and slip resistance of 0.5 to 3.5% And 8-17% by weight of a solvent methyl ethyl ketone and 8-17% by weight of ethyl acetate. More specifically, the white pigment TiO ₂ (Ethylene ethyl ketone) of 10 to 15% by weight and ethylene acetate (Ethylen Acetate) in an amount of 40 to 45 wt%, polyethylene 4 to 5 wt%, polyurethane resin 15 to 20 wt% and polyethylene wax 1 to 3 wt% To 10 to 15% by weight of the white ink composition may be printed on the lower surface of the substrate layer on which the pattern layer is formed, or on the upper surface of the resin layer on which the following colored layer is formed.

Further, the colored layer may be formed by printing a colored ink containing known pigments, additives and a solvent. The pigment can be selectively used according to the desired hue. Specifically, 30 to 50 wt% of a white pigment, 0.3 to 1.5 wt% of a yellow pigment and 0.3 to 1.5 wt% of a black pigment are mixed with 3 to 6 wt% % Of a polyurethane resin for adhesive strength, and 0.5 to 3.5% by weight of a polyethylene wax for abrasion resistance and slip resistance are mixed with 8 to 17% by weight of methyl ethyl ketone and Ethylen Acetate, 8 to 17% by weight, and more specifically, a white pigment TiO ₂ 40 to 45 wt%, Yellow pigment 0.5 to 1 wt%, Black pigment 0.5 to 1 wt% Polyethylene 4 to 5 wt%, Polyurethane resin 15 to 20 wt% and Polyethylene wax 1 to 3 wt% , 10 to 15% by weight of methyl ethyl ketone and 10 to 15% by weight of ethylene acetate, and printing on the upper surface of the resin layer.

The printing thickness of the white layer and the colored layer can be determined by a printing method. But may be printed in gravure printing, but is not limited thereto. The thickness of the shielding printing layer may be 6 to 8 탆 for the white copper layer and 3 to 4 탆 for the copper copper foil when applied to gravure printing, and 9 to 12 탆 for the white copper layer, The colored layer may be 4.5 to 6 占 퐉. When printed thinner than the above-mentioned thickness, the print quality is lowered, and when it is thickly printed, the process economy is lowered.

An adhesive layer may further be provided between the base layer, the resin layer and the sealant layer. That is, the pattern layer and the white layer may be formed to bond the printed base layer with the resin layer and the sealant layer on which the colored layer and the white layer are printed. The adhesive layer may be formed using a known adhesive. Specifically, a polyurethane adhesive, an acrylic adhesive, an epoxy adhesive, a polyolefin adhesive, an elastomer adhesive, and a fluorine adhesive may be used. Adhesives may be used, but are not limited thereto.

In the retort packaging material, the adhesive layer is preferably 1 to 3 mu m. When the thickness is less than 1 mu m, the bonding is not performed. When the thickness is more than 3 mu m, the process economy is poor.

The laminated material for food packaging of the present application can be heated by using a microwave oven even in a packaged state without using aluminum, while having the same shielding property as when aluminum is used, the printing frequency of the base layer is not greatly reduced, There is an effect that can be maintained

The present application also relates to a food packaging material made of the laminate for food packaging. The food packaging material may be manufactured by a known manufacturing method, and the food packaging material may be a known packaging material, such as a four-sided sealing pouch or a standing pouch, but is not limited thereto .

Hereinafter, the present application will be described in more detail through examples. However, the embodiments are not intended to limit the scope of the present application as an example of the present application.

[ Example ]

Experimental Example  1: for food packaging Laminated  Shading ratio comparison

In order to confirm the light shading effect of the laminate for food packaging of the present application to which the two-ply white layer and the one-ply colored layer were applied, laminated materials were prepared in the composition shown in Table 1, The shading rate was measured. The results are shown in Table 1. Each layer in Table 1 was bonded with a polyurethane-based adhesive to produce a laminate for food packaging.

Comparison of composition and light shading ratio of packaging laminate The substrate layer Resin layer Sealant layer Shading rate Transparent deposition PET (2 layer high density white layer printing) NY RCPP 0.56 Transparent deposition PET (2 layers of high density white layer, 1 layer of gray layer printing) NY RCPP 0.92 Transparent deposition PET (1 layer of high density white layer, 1 layer of gray layer printing) NY RCPP 0.89 Transparent deposition PET Milky white PET-NY RCPP 0.63 Transparent deposition PET NY Milky RiPP 0.58 Transparent deposition PET Milky white PET-NY RCPP 0.75 PET (2 layers of plain white layer printing) X CPP 0.41 PET (2 layer high density white layer printing) X CPP 0.46 PET (two layers of high density white layer, one layer of gray layer printing) X CPP 0.9 PET (1 layer of plain white layer printing) 0.34 PET (1 layer high density white layer printing) 0.43 Milky white PET fabric 0.65 Milkshake RiPP single fabric 0.47 Aluminum pouch 0.99 Transparent deposition PET / PET 0.13

As shown in Table 1, except for the aluminum pouch, the light shading ratio of the laminated material is 0.63 when a milky white fiber such as milky white PET is used for the light shading ratio of the laminated material as compared with the prior art, while the two- Laminated materials using gray layers have a high value of 0.9 or more. This is slightly lower than the shading rate of the aluminum pouch of 0.99, but it can be seen that it is a laminated material which shows a higher shading rate than those using other fabrics. It is also understood that even when the resin layer with or without the print layer is changed, the shading ratio is not greatly affected.

Experimental Example  2: For packing food according to printing order Laminated  Shading rate measurement result

In order to measure the shading rate according to the printing order, a laminate for food packaging was manufactured with the constitutions of Production Example 1 and Comparative Examples 1 and 2, and the shading rate was confirmed.

One. Comparative Example  1: existing or general Laminated construction

(1) Formation of the barrier substrate layer 210

The base layer was formed of polyethylene terephthalate 12 (PET 12) at 12 μm and a barrier coating material was applied to form a barrier base layer 210.

(2) Printing of a pattern layer (not shown) and a white layer 251 on the lower surface of the base layer 210

An ink composition for a pattern for printing a pattern layer according to a desired pattern was prepared and subjected to gravure printing on the base layer (not shown).

Then 40 to 45 wt.% Of TiO ₂ , 4 to 5 wt.% Of polyethylene resin, 15 to 20 wt.% Of polyurethane resin, 1 to 3 wt.% Of polyethylene wax, 10 to 15 wt.% Of methyl ethyl ketone and 10 to 15 wt. Was formed on the bottom surface of the substrate layer 210 having the pattern layer formed thereon by gravure printing using a copper copper foil to a thickness of 6 to 8 탆 to form a white layer 251.

(3) Formation of the resin layers 220 and 230

A resin layer 220 having a thickness of 12 μm was formed on the milky white PET and a resin layer 230 having a thickness of 15 μm was formed on the nylon 15 (NY15).

(4) Formation of the sealant layer 240

The sealant layer 240 was formed by heat-resistant, non-rub- ber-polypropylene (RCPP) to a thickness of 70 mu m.

(6) Adhesion

A base layer on which the pattern layer and the white layer were printed, a resin layer on which the colored layer and the white layer were printed, and a sealant layer were laminated with a polyurethane adhesive to prepare a laminate for food packaging. (See Fig. 2)

2. Comparative Example  2: Conventional shielded printing Laminated construction

(1) Formation of the barrier substrate layer 310

The base layer was formed of polyethylene terephthalate 12 (PET 12) at 12 μm and a barrier coating material was applied to form a barrier base layer 310.

(2) Printing of a pattern layer, a double-layered white layer and a colored layer on the lower surface of the base layer

An ink composition for a pattern for printing a pattern layer according to a desired pattern was prepared, and a pattern layer (not shown) was formed by gravure printing on the bottom face of the base layer.

Then 40 to 45 wt.% Of TiO ₂ , 4 to 5 wt.% Of polyethylene resin, 15 to 20 wt.% Of polyurethane resin, 1 to 3 wt.% Of polyethylene wax, 10 to 15 wt.% Of methyl ethyl ketone and 10 to 15 wt. Was gravure printed on the lower surface of the substrate layer having the patterned layer by using a copper copper plate at a thickness of 6 to 8 탆 to form two layers of white layers 351 and 352.

40 to 45 wt% of TiO ₂ , 0.5 to 1 wt% of Yellow 180, 0.5 to 1 wt% of Black, 4 to 5 wt% of a polyethylene resin, 15 to 20 wt% of a polyurethane resin, and 1 to 3 wt% of a polyethylene wax 10 to 15% by weight of ethyl ketone and 10 to 15% by weight of ethylene acetate was gravure printed on the top surface of the resin layer to a thickness of 3 to 4 탆 using a copper copper foil to form a colored layer 353.

(3) Formation of resin layers 320 and 330

The resin layers 320 and 330 were formed by forming polyethylene terephthalate 12 (PET 12) and nylon 15 (NY15) to a thickness of 15 μm (PET 12 layers: 320, NY 15 layers: 330).

(4) Formation of the sealant layer 340

The sealant layer was formed by heat-resistant, non-rub- ber-polypropylene (RCPP) to a thickness of 70 mu m.

(6) Adhesion

The base layer, the resin layer and the sealant layer on which the pattern layer, the two-ply white layer and the colored layer were printed were bonded to each other with a polyurethane adhesive to prepare a laminate for food packaging. (See Fig. 3)

 3. Manufacturing example  1: Application for food packaging Laminated construction

(1) Formation of the barrier substrate layer 410

The base layer was formed of polyethylene terephthalate 12 (PET 12) at 12 μm and a barrier coating material was applied to form a barrier base layer 410.

(2) Printing of the design layer and the white layer 451 on the lower surface of the base layer 410

An ink composition for design for printing a pattern layer according to a desired pattern was prepared, and gravure printing was performed on the bottom layer to form a pattern layer.

Then 40 to 45 wt.% Of TiO ₂ , 4 to 5 wt.% Of polyethylene resin, 15 to 20 wt.% Of polyurethane resin, 1 to 3 wt.% Of polyethylene wax, 10 to 15 wt.% Of methyl ethyl ketone and 10 to 15 wt. Was gravure printed on the lower surface of the substrate layer having the pattern layer formed thereon to a thickness of 6 to 8 탆 using a copper copper foil to form a white layer 451.

(3) Formation of the resin layer 420

The resin layer was formed by forming polyethylene terephthalate 12 (PET12) to a thickness of 12 mu m.

(4) Printing of the white layer 452 and the colored layer 453 on the lower surface of the resin layer 420

40 to 45% by weight of TiO ₂ , 4 to 5% by weight of a polyethylene resin, 15 to 20% by weight of a polyurethane resin, 1 to 3% by weight of polyethylene wax and 10 to 15% by weight of methyl ethyl ketone, And 10 to 15% by weight of acetate was gravure printed to a thickness of 6 to 8 占 퐉 using a copper copper foil to form a white layer 452. [

Then, 40 to 45 wt% of TiO ₂ , 0.5 to 1 wt% of Yellow 180, 0.5 to 1 wt% of Black, 4 to 5 wt% of polyethylene resin, 15 to 20 wt% of polyurethane resin, A colored ink composition containing 1 to 3% by weight of wax, 10 to 15% by weight of methyl ethyl ketone and 10 to 15% by weight of ethylene acetate was gravure printed to a thickness of 3 to 4 탆 using a copper copper foil to form a colored layer 453 .

(5) Formation of the resin layer 430

The resin layer 430 was made of nylon 15 (NY15) with a thickness of 15 mu m.

(6) Formation of the sealant layer 440

The sealant layer 440 was formed by heat-resistant, non-rub- ber-polypropylene (RCPP) to a thickness of 70 mu m.

(6) Adhesion

The resin layer and the sealant layer printed with the base layer, the white layer and the colored layer printed with the pattern layer and the white layer described above were bonded to each other with a polyurethane adhesive to prepare a laminate for food packaging. (See Fig. 4)

Shading rate measurement result of laminated material for food packaging according to printing order Comparative Example 1 Comparative Example 2 Production Example 1 0.66 0.86 0.84

It can be seen that the laminate for food packaging of Production Example 1 significantly increases the light shading rate as compared with the packaging laminate of Comparative Example 1, and it can be confirmed that the shading ratio of the shielding printing laminate of Comparative Example 2 is similar.

Experimental Example 3: Confirmation of the color of the laminated material for food packaging according to the printing order

In the laminate of Experimental Example 2, the pattern layers were printed using the same color except for the printing order, and the colors were compared. (See Figures 5 and 6)

It was confirmed that the two laminated materials of Comparative Example 2 and Production Example 1 in which the colored layer was compared with the conventional or general laminated material composition of Comparative Example 1 were poor in clarity due to the influence of the colored layer. However, in the case of the laminate for food packaging according to the present application of Production Example 1, it can be confirmed that the lightness and the saturation are higher in comparison with the conventional shielding laminated material composition of Comparative Example 2. [

Therefore, it can be confirmed that the laminate for food packaging of the present application has a sufficient light-shielding ratio as a laminate for food packaging and a good print quality of the pattern layer.

10, 210, 310, 410: substrate layer
20, 220, 230, 320, 330, 420, 430:
40, 240, 340, 440: sealant layer
51, 52, 251, 351, 352, 451, 452:
53, 353, 453: colored layer 60, 260, 360, 460: adhesive layer

Claims (6)

A base layer;
At least one resin layer formed on the lower surface of the substrate layer; And
And a sealant layer formed on a lower surface of the resin layer,
Wherein the substrate layer is printed and formed with a pattern layer and a white layer sequentially on a lower surface thereof, and the resin layer is formed by successively printing a colored layer and a white layer on an upper surface or a lower surface thereof. The method according to claim 1,
Wherein a barrier material is used or deposited on at least one of the base layer and the resin layer. The method according to claim 1,
Wherein the white layer and the colored layer are printed on the surface of the laminate. The method according to claim 1,
Wherein the white layer comprises 30 to 50 wt% of a white pigment and the colored layer comprises 30 to 50 wt% of a white pigment, 0.3 to 1.5 wt% of a yellow pigment and 0.3 to 1.5 wt% of a black pigment. Laminated material for packaging. The method according to claim 1,
Further comprising an adhesive layer between the base layer, the resin layer and the sealant layer. A food packaging material made of the laminate for food packaging according to claim 1.

Images