Transfer metal coated cardboard and manufacturing method therefor

Abstract

A transfer metal coated cardboard, comprising a base paper layer which provides support and stability for the transfer metal coated cardboard; a printing layer which is arranged on the base paper layer and can be printed with various colors, shapes and patterns; and a polyurethane layer which is arranged on the printing layer and improves the folding resistance and the waterproof performance of the transfer metal coated cardboard. The present invention further relates to a method for manufacturing a transfer metal coated cardboard.

Description

Transfer metal plated card paper and method of manufacturing the same TECHNICAL FIELD

[0001] The present invention relates to the technical field of packaging materials, and more particularly, to a transfer metal plated card paper. The present invention also relates to a method of manufacturing the transfer metal plated card paper. BACKGROUND

[0002] In the packaging of cigarettes, wine and cosmetics, a film is usually laminated on the surface of the card paper to increase the gloss and protection. This technology is usually widely used in the high-end packaging of cigarettes, wine and cosmetics. The film-laminated card paper can improve the appearance of the product packaging, making it look more high-end, smooth, and having certain waterproof and moisture-proof functions. This packaging form is often used in the packaging of high-end cosmetics such as color cosmetics and skin care products to highlight the quality and brand image of the products and attract the attention of consumers.

[0003] However, since the surface of the card paper is laminated with a film, the card paper used as a packaging material is not environmentally friendly during manufacturing and recycling. Therefore, a transfer metal plated card paper has been developed, which has the environmentally friendly property of being recyclable compared to traditional film-laminated card paper, and can be used for printing high-end packaging of cigarettes, wine, cosmetics, etc., while taking the advantages of traditional gold and silver card paper, aluminum foil card paper and radium radiation card paper in terms of appearance and elegance. At the same time, the aluminum layer in the transfer metal plated card paper is relatively thin compared to aluminum foil card paper, which can save aluminum material and has a higher gloss, so it can replace film-laminated aluminum foil card paper.

[0004] However, the transfer metal plated card paper does not have the protection of a plastic film on the outer layer, and has poor folding resistance. The carton made of the transfer metal plated card paper is prone to cracking at the folding line after being folded. Especially for the packaging box for cosmetics, which usually has a deep color or rich color in appearance, if the carton cracks due to repeated folding, the bottom paper of the card paper will be exposed, which is usually in the form of white fibers, and the conspicuous white crease seriously affects the appearance of the carton.

[0005] Therefore, there is still a need in the art for an improved transfer metal plated card paper and a method of manufacturing the transfer metal plated card paper, which has excellent folding resistance, can maintain the perfect appearance of the transfer metal plated card paper and prolong the service life. SUMMARY

[0006] It is one of the objects of the present invention to provide an improved transfer metal plated card paper which has excellent folding resistance, can maintain the perfect appearance of the transfer metal plated card paper and prolong the service life. It is another object of the present invention to provide a method of manufacturing the transfer metal plated card paper.

[0007] According to an aspect of the present application, there is provided a transfer metal plated card, wherein the transfer metal plated card comprises:

[0008] a base paper layer providing support and stability to the transfer metal plated card;

[0009] a print layer disposed on the base paper layer, the print layer being printable with various colors, shapes and patterns; and

[0010] a polyurethane layer disposed on the print layer.

[0011] In one embodiment of the transfer metal plated card of the present application, the transfer metal plated card further comprises a primer layer disposed between the base paper layer and the print layer.

[0012] In one embodiment of the transfer metal plated card of the present application, the polyurethane layer has a thickness of 0.1-10 μm, preferably 3-7 μm.

[0013] In one embodiment of the transfer metal plated card of the present application, the transfer metal plated card further comprises:

[0014] an adhesive layer disposed on the base paper layer;

[0015] a metal plated layer disposed on the adhesive layer; and

[0016] a transfer layer disposed on the metal plated layer and between the metal plated layer and the print layer.

[0017] In one embodiment of the transfer metal plated card of the present application, the transfer metal plated card further comprises a primer layer disposed between the transfer layer and the print layer.

[0018] In one embodiment of the transfer metal plated card of the present application, the primer layer has a density of 1-9 g / m 2 , preferably 3.5-4.5 g / m 2 .

[0019] In one embodiment of the transfer metal plated card of the present application, the transfer layer has a density of 0.1-5 g / m 2 , preferably 1-1.5 g / m 2 .

[0020] In one embodiment of the transfer metal plated card of the present application, the adhesive layer has a density of 0.1-10 g / m 2 , preferably 2.5-4 g / m 2 .

[0021] In one embodiment of the transfer metal plated card paper of the present application, the base paper layer has a density of 20-1000 g / m 2 , preferably 180-400 g / m 2 .

[0022] In one embodiment of the transfer metal plated card paper of the present application, the metal plating layer has a thickness of 0.005 μm-0.200 μm, preferably 0.030 μm-0.060 μm.

[0023] According to another aspect of the present application, there is provided a method of manufacturing a transfer metal plated card paper, characterized in that the method comprises the steps of:

[0024] providing a base paper layer;

[0025] applying an adhesive layer on the metal plating layer and adhering the metal plating layer to the base paper layer;

[0026] peeling the film from the transfer layer and adhering the transfer layer to the metal plating layer;

[0027] performing printing on the transfer layer to form a printed layer on the transfer layer; and

[0028] adhering a polyurethane layer to the printed layer.

[0029] In one embodiment of the method of manufacturing a transfer metal plated card paper of the present application, the method further comprises:

[0030] applying a base coat on the transfer layer to form a base coat layer, then performing printing on the base coat layer to form a printed layer on the base coat layer, and then forming a polyurethane layer on the printed layer by a film coating process.

[0031] In another embodiment of the method of manufacturing a transfer metal plated card paper of the present application, the polyurethane layer is prepared from a two-component water-based polyurethane emulsion including the following components by weight ratio: polyurethane emulsion (solid content 60%): 50.00-60.00%; water: 30.00-40.00%; defoaming agent: 0.20-0.40%; anti-scratch agent: 0.50-1.00%; wetting and leveling agent: 0.50-1.00%; associative acrylic high-shear rheological additive: 1.00-2.00%; associative acrylic low-shear rheological additive: 1.00-4.00%; gloss adjuster: 0.00-12.00%; curing agent: 0.20-0.50%.

[0032] By means of the transfer metal plated card paper and the manufacturing method thereof according to the present application, the obtained transfer metal plated card paper can have good mechanical strength, moisture-proof performance and air-proof performance, and can be widely applied in the packaging of food, medicine, cosmetics and other industries, so as to protect the packaged articles from the influence of external environment, prolong the shelf life, protect the integrity of the packaging and improve the product image. BRIEF DESCRIPTION OF DRAWINGS

[0033] The objects and features of the present application will become apparent from the following detailed description, taken in conjunction with the accompanying drawings, which illustrate, by way of example, the principles of the application. It is to be understood that this purpose has been satisfied by this application, and that its objects and features can be obtained by this application as constructed and arranged in the manner which will become apparent from the following description. Other objects and features of the present application will be in part apparent and in part pointed out hereinafter.

[0034] Fig. 1 shows a schematic cross-sectional view of a transfer metal plated card paper according to one embodiment of the present application;

[0035] Fig. 2 shows a schematic cross-sectional view of a transfer metal plated card paper according to another embodiment of the present application;

[0036] Fig. 3 shows a schematic cross-sectional view of a transfer metal plated card paper according to another embodiment of the present application; and

[0037] Fig. 4 shows a schematic cross-sectional view of a transfer metal plated card paper according to another embodiment of the present application. DETAILED DESCRIPTION

[0038] The technical solutions of the present application will be described clearly and completely below in conjunction with the drawings. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the present application.

[0039] In the description of the application, it should be noted that unless otherwise explicitly specified and limited, the terms "connected", etc. should be interpreted in a broad manner, for example, can be fixedly connected, can be detachably connected, or integrally connected; can be mechanically connected, or electrically connected; can be directly connected, or indirectly connected through an intermediate medium. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances. In addition, in the description of the application, unless otherwise specified, the meaning of "a plurality of" is two or more. It should also be understood that the orientations or positional relationships indicated by the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "axial", "radial", "circumferential" and the like are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0040] In the description of the present application, the description of the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the illustrative description of the terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0041] Unless otherwise specified, all numbers expressing quantities of components and / or conditions are to be understood as being modified in all instances by the term "about", meaning the value of the quantity is within 10% of the stated value (e.g., "about 10%" means 9% to 11%, "about 2%" means 1.8% to 2.2%, etc.).

[0042] In addition, the ranges recited in the application and claims are intended to specifically include the entire range, and not just the endpoints. For example, the recited range of 0-10 is intended to disclose all integers between 0 and 10, e.g., 1, 2, 3, 4, and any sub-range formed by any two values therein, etc., all fractions between 0 and 10, e.g., 1.5, 2.3, 4.57, 6.1113, and any sub-range formed by any two values therein, etc., and the endpoints 0 and 10.

[0043] Unless otherwise specified, all parts or percentages in the present application refer to parts by weight or weight percentages.

[0044] For the person skilled in the art to understand the technical solutions of the present application, the technical solutions of the present application will be further described in conjunction with the drawings of the specification, wherein the same reference signs refer to the same or similar elements.

[0045] Fig. 1 shows a schematic cross-sectional view of a transfer metal-coated paperboard according to one embodiment of the present application. As shown in Fig. 1, the transfer metal-coated paperboard comprises a base paper layer 1, which in a preferred embodiment of the present application is paperboard or white paperboard. The base paper layer 1 provides overall support and stability. The thickness and mass of the base paper layer 1 is generally determined by the specific packaging requirements and can be adjusted according to the weight and size of the packaged item. In one embodiment of the present application, the base paper layer 1 has a density of 20-1000 g / m2, preferably 180-400 g / m2. 2 2

[0046] In one embodiment of the present application, as shown in Fig. 1, a printing layer 6 is provided on top of the base paper layer 1. Various colors, shapes, patterns, and the like can be printed on the printing layer 6 as desired. Single or multi-color images can be printed on the printing layer 6. The content of the images is also not actually limited. The images can include decorative features, company logos, trademarks, photographs, pictures, cartoons, and / or information. The information can be conveniently read by the naked eye, such as text, or can be machine-readable, such as a bar code, or a combination of both.

[0047] In one embodiment of the present application, as shown in Fig. 1, a polyurethane layer 7 is provided on top of the printing layer 6. In one embodiment of the present application, the polyurethane layer improves the folding resistance and water resistance of the transfer metal-coated paperboard. Polyurethane materials have excellent bonding properties and durability. The polyurethane layer 7 uses water as a medium and is non-toxic and non-polluting, causing no environmental pollution. In addition, the polyurethane layer 7 can protect the paperboard, just like a protective film is formed on the outermost layer of the paperboard. The polyurethane layer 7 itself does not actually have a film, but functions as a protective film and is environmentally friendly. In embodiments of the present application, the polyurethane layer improves the water resistance of the transfer metal-coated paperboard. In embodiments of the present application, due to the provision of the polyurethane layer 7, the paperboard has good water resistance and enhanced folding resistance. The present application realizes plastic or film removal treatment on the surface of the packaging printed material, avoids environmental pollution, promotes the recycling of resources, and conforms to the national sustainable development and environmental protection economic and technological policy direction.

[0048] ​​Figure 2 shows a schematic cross-sectional view of a transfer metallized card paper according to another embodiment of the present application. The embodiment of Figure 2 is substantially the same as the embodiment of Figure 1, except that in addition to all the layers of the transfer metallized card paper of Figure 1, the transfer metallized card paper of Figure 2 further comprises a primer layer 5 disposed between the base paper layer 1 and the print layer 6. The primer layer 5 helps to enhance the adhesion and durability of the coating layers including the print layer 6. In one embodiment of the present application, the primer layer 5 has a density of 1-9 g / m 2 , preferably 3.5-4.5 g / m 2 .

[0049] Figure 3 shows a schematic cross-sectional view of a transfer metallized card paper according to another embodiment of the present application. The embodiment of Figure 3 is different from the embodiment of Figure 1 in that in addition to all the layers of the transfer metallized card paper of Figure 1, the transfer metallized card paper of Figure 3 further comprises an adhesive layer 2, a metal coating layer 3 and a transfer layer 4 disposed between the base paper layer 1 and the print layer 6.

[0050] In a preferred embodiment of the present application, as shown in Figure 3, an adhesive layer 2 is disposed on top of the base paper layer 1, and a metal coating layer 3 is disposed on top of the adhesive layer 2. In one embodiment of the present application, after the metal is electroplated on a plastic transfer film to form the metal coating layer, the plastic transfer film is adhered to the base paper layer 1 using the adhesive layer 2, and then the plastic transfer film is peeled off from the metal coating layer 3 and the base paper layer 1 adhered together, thereby removing the film from the card paper formed. In addition, the metal coating layer 3 is preferably an aluminum coating layer with a small amount of aluminum, and the metal coating layer 3 has a thickness of 0.005 μm to 0.200 μm, preferably only 0.030 μm to 0.060 μm, which is a small amount that does not affect the environment and can be recycled as paper waste, and is both aesthetically pleasing and environmentally friendly. In addition, since the film is removed from the card paper before the card paper is completed, that is, the card paper is no longer covered with a film, the card paper used as a packaging material is environmentally friendly when recycled. In one embodiment of the present application, as shown in Figure 3, a transfer layer 4 is disposed on top of the metal coating layer 3. The transfer layer 4 can be used for post-processing such as gold stamping, silk printing and digital printing.

[0051] It should be understood that in addition to aluminum plating, the metal coating layer 3 can be formed by electroplating other metals, for example, a zinc plating layer, a nickel plating layer, a chromium plating layer, a copper plating layer, a tin plating layer, etc. can be formed by electroplating zinc, nickel, chromium, copper, tin, etc.

[0052] Figure 4 shows a schematic cross-sectional view of a transfer metallized paper according to another embodiment of the present application. The embodiment of Figure 4 is substantially the same as the embodiment of Figure 3, except that the transfer metallized paper of Figure 4 further comprises a primer layer 5 disposed between the transfer layer 4 and the print layer 6 in addition to all the layers of the transfer metallized paper of Figure 3. The primer layer 5 helps to enhance the adhesion and durability of the coating layers including the print layer 6. In one embodiment of the present application, the density of the primer layer 5 is 1-9 g / m 2 , preferably 3.5-4.5 g / m 2 .

[0053] In one embodiment of the present application, the density of the adhesive layer 2 is 0.1-10 g / m 2 , preferably 2.5-4 g / m 2 . In one embodiment of the present application, the density of the transfer layer 4 is 0.1-5 g / m 2 , preferably 1-1.5 g / m 2 . In one embodiment of the present application, the density of the print layer 6 is 0.5-15 g / m 2 , preferably 1-12 g / m 2 . In one embodiment of the present application, the thickness of the polyurethane layer 7 is 0.1-10 μm, preferably 3-7 μm.

[0054] In embodiments of the present application, by the combination of the multi-layer structure optionally comprising the base paper layer 1, the adhesive layer 2, the metal coating layer 3, the transfer layer 4, the primer layer 5, the print layer 6 and the polyurethane layer 7, the transfer metallized paper is capable of having good mechanical strength, moisture resistance and air resistance, and is widely used in the packaging of food, medicine, cosmetics and other industries to protect the packaged articles from the external environment, prolong the shelf life, protect the integrity of the packaging and enhance the product image.

[0055] In another aspect of the present application, a manufacturing method of the transfer metallized paper is also provided. In one embodiment, the manufacturing method of the transfer metallized paper can comprise the following steps: providing a base paper layer 1; printing on the base paper layer 1 to form a print layer 6; preparing a two-component polyurethane emulsion, for example, and forming a polyurethane layer 7 on the print layer 6 by a coating process. In an alternative embodiment, a primer can also be coated on the base paper layer 1 to form a primer layer 5, and then printing on the primer layer 5 to form a print layer 6 on the primer layer 5, and then forming a polyurethane layer 7 on the print layer 6 by a coating process.

[0056] In another embodiment, the method of manufacturing a transfer metal plated card can include the steps of: providing a base paper layer 1 ; applying an adhesive layer 2 on a metal plated layer 3 and adhering the metal plated layer 3 to the base paper layer 1 ; peeling a film from a transfer layer 4 and adhering the transfer layer 4 to the metal plated layer 3; printing on the transfer layer 4 to form a printed layer 6 on the transfer layer 4; and adhering a polyurethane layer 7 to the printed layer 6. In an optional embodiment, a base coat can be applied on the transfer layer 4 to form a base coat layer 5, then printing is performed on the base coat layer 5 to form a printed layer 6 on the base coat layer 5, and then a polyurethane layer 7 is formed on the printed layer 6 by a lamination process.

[0057] In one embodiment of the present application, the polyurethane layer 7 is prepared by a two-component polyurethane emulsion. In one embodiment of the present application, the polyurethane layer 7 is prepared by uniformly applying a two-component polyurethane emulsion on an OPP base film and maintaining a sufficient coating thickness, and drying to obtain the polyurethane layer 7.

[0058] In one embodiment, the multifunctional two-component water-based polyurethane emulsion includes the following components by weight ratio: polyurethane emulsion (solid content 60%): 50.00-60.00%; water: 30.00-40.00%; defoaming agent: 0.20-0.40%; anti-scratch agent: 0.50-1.00%; wetting and leveling agent: 0.50-1.00%; associative acrylic high-shear rheological additive: 1.00-2.00%; associative acrylic low-shear rheological additive: 1.00-4.00%; gloss adjuster: 0.00-12.00%;

[0059] Curing agent: 0.20-0.50%. In one embodiment, the defoamer includes one or more of silicone-based defoamers, such as including polydimethylsiloxane (PDMS), modified silicones, and hydrophobic silica; mineral oil-based defoamers, such as including mineral oil, hydrophobic particles (such as waxes, silicas), emulsifiers or dispersants (such as fatty alcohols or polyethers); polyether-based defoamers, such as including polyoxyethylene-polyoxypropylene copolymers (EO / PO Copolymers) and polyether-modified silicones. In one embodiment, the anti-scratch agent includes, for example, polyethylene wax (PE Wax), polypropylene wax (PP Wax), polytetrafluoroethylene wax (PTFE Wax), fatty acid ester wax, or siloxane-modified polymers, dynamic covalent bonds polymers, or polyurea, etc. In one embodiment, the wetting leveling agent includes one or more of polydimethylsiloxane (PDMS), polyether-modified silicones, acrylic-modified silicones, low molecular weight acrylate polymers, etc. In one embodiment, the associative acrylic high shear rheological additive includes one or more of acrylic copolymers, polyether chains (EO / PO Copolymers), alkyl hydrophobic groups, and anionic / non-ionic groups (carboxyl, amide groups), etc. In one embodiment, the associative acrylic low shear rheological additive is, for example, selected from Acrysol RM-12W, Coapur 830W, Tafigel PUR 61, or Viscalex HV20. In one embodiment, the gloss adjuster includes one or more of silica (SiO2), aluminum silicate, bentonite, waxes (PE wax, PTFE wax), thermoplastic resins, calcium carbonate, talc, etc.In one embodiment, the curing agent comprises one or more of the following: a waterborne isocyanate curing agent, such as Bayhydur 304; a blocked isocyanate curing agent, such as Bayhydur BL 5335; a waterborne epoxy-amine curing agent, such as Anquamine 287, and the like.

[0060] In one embodiment, the above components are sequentially added to a stirring tank in the above proportions while stirring, and the two-component waterborne polyurethane emulsion is stirred at a speed of 400 rpm for 30 minutes, the viscosity is controlled at 40-45 Pa.s (Pascal-seconds), and then filtered for standby. Then the coating transfer process is implemented, including using a film adhesive as the bonding agent, adhering the pre-coated film coated on the OPP base film to the surface of the printed substrate by a film coating process, hot pressing, drying, and peeling off the OPP base film to achieve the transfer of the polyurethane layer 7 adhered to the surface of the printed substrate or printed layer, winding, and finished product. In one embodiment, the pre-coated film hot pressing transfer temperature is 115°C.

[0061] Although the present specification describes the embodiments in detail, not every embodiment contains only one independent technical solution, and the description of the specification is only for clarity. The skilled person should consider the specification as a whole, and the technical solutions in each embodiment can be combined appropriately to form other embodiments that the skilled person can understand. The scope of the present application is defined by the appended claims, not the above description, and therefore all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present application.

[0062] The present application is not limited to the details of the above exemplary embodiments, but can be implemented in other specific forms for those skilled in the art without departing from the spirit or essential characteristics of the present application. Therefore, the above-described embodiments should be considered as exemplary and non-limiting.

Claims

1. A transfer metal plated card, characterized by, The transfer metallized paperboard includes: a base paper layer providing support and stability to the transfer metallized paperboard; a print layer disposed on the base paper layer, the print layer being printable with various colors, shapes, and patterns; and a polyurethane layer disposed on the print layer.

2. The transfer metal plated card paper according to claim 1, wherein, The transfer metallized paperboard further includes a primer layer disposed between the base paper layer and the print layer.

3. The transfer metal plated card sheet according to claim 1 or 2, wherein, The polyurethane layer has a thickness of 0.1-10 μm, preferably 3-7 μm.

4. The transfer metal plated cardstock of claim 1, wherein, The transfer metallized paperboard further includes: an adhesive layer disposed on the base paper layer; a metal plating layer disposed on the adhesive layer; and a transfer layer disposed on the metal plating layer and between the metal plating layer and the print layer.

5. The transfer metal plated cardstock of claim 4, wherein, The transfer metallized paperboard further includes a primer layer disposed between the transfer layer and the print layer.

6. The transfer metal plated card sheet according to claim 2 or 5, wherein, The density of the base coat is 1 to 9 g / m 2 , preferably 3.5 to 4.5 g / m 2 .

7. The transfer metal plated card sheet according to claim 4 or 5, wherein, The density of the transfer layer is 0.1-5 g / m 2 , preferably 1-1.5 g / m 2 .

8. The transfer metal plated card sheet according to claim 4 or 5, wherein, The density of the adhesive layer is 0.1-10 g / m 2 , preferably 2.5-4 g / m 2 .

9. The transfer metal plated cardstock of any one of claims 1, 2, 4, and 5, wherein, The density of the base paper layer is 20-1000 g / m 2 , preferably 180-400 g / m 2 .

10. The transfer metal plated card sheet according to claim 4 or 5, wherein, The metal plating layer has a thickness of 0.005 μm-0.200 μm, preferably 0.030 μm-0.060 μm.

11. A method of manufacturing a transfer metal plated card, characterized by, The method includes the steps of: providing a base paper layer; applying an adhesive layer on a metal plating layer and adhering the metal plating layer to the base paper layer; peeling a film from a transfer layer and adhering the transfer layer to the metal plating layer; printing on the transfer layer to form a print layer on the transfer layer; and adhering a polyurethane layer to the print layer.

12. The manufacturing method according to claim 11, wherein The method further includes: applying a primer on the transfer layer to form a primer layer, then printing on the primer layer to form a print layer on the primer layer, and then forming a polyurethane layer on the print layer by a film coating process.

13. The manufacturing method according to claim 11 or 12, characterized by, The polyurethane layer is prepared from a two-component water-based polyurethane emulsion including the following components by weight ratio: polyurethane emulsion (solid content 60%): 50.00-60.00%; water: 30.00-40.00%; defoaming agent: 0.20-0.40%; anti-scratch agent: 0.50-1.00%; wetting leveling agent: 0.50-1.00%; associative acrylic high-shear rheological additive: 1.00-2.00%; associative acrylic low-shear rheological additive: 1.00-4.00%; gloss adjuster: 0.00-12.00%; curing agent: 0.20-0.50%.

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