Patent Application
20250154725
This application claims the benefit of priority to Taiwan Patent Application No. 112143602, filed on Nov. 13, 2023. The entire content of the above identified application is incorporated herein by reference.
Some references, which may include patents, patent applications and various publications, may be cited and discussed in the description of this disclosure. The citation and/or discussion of such references is provided merely to clarify the description of the present disclosure and is not an admission that any such reference is “prior art” to the disclosure described herein. All references cited and discussed in this specification are incorporated herein by reference in their entireties and to the same extent as if each reference was individually incorporated by reference.
The present disclosure relates to a pearl paper and a method for producing the same, and more particularly to a coated pearl paper and a method for producing the same.
In the conventional technology, in order to print an ink onto a pearl paper, a coating layer is firstly coated onto the pearl paper. However, since the compatibility between the coating layer and the ink or the compatibility between the coating layer and the pearl paper is poor, the ink is not easily adhered to the coating layer.
In response to the above-referenced technical inadequacy, the present disclosure provides a coated pearl paper and a method for producing the same, so as to effectively improve an issue of a coating layer on a conventional pearl paper being not easily adhered by an ink.
In order to solve the above-mentioned problem, one of the technical aspects adopted by the present disclosure is to provide a coated pearl paper. The coated pearl paper includes a pearl paper and a coating layer. The pearl paper includes a major layer and two minor layers arranged at two sides of the major layer. The major layer includes a first resin and a plurality of first mixed inorganic particles, the first resin includes polypropylene, and the first mixed inorganic particles include calcium carbonate, silicon dioxide, and titanium dioxide. Each of the minor layers includes a second resin and a plurality of second mixed inorganic particles, the second resin includes polypropylene, and the second mixed inorganic particles include calcium carbonate, silicon dioxide, and titanium dioxide. The coating layer is formed by coating a coating liquid onto one of the minor layers of the pearl paper, and the coating liquid includes a third resin, a plurality of third mixed inorganic particles, and water. The third resin is an acrylate graft-modified polyurethane resin, and the third mixed inorganic particles include calcium carbonate, silicon dioxide, and titanium dioxide. Based on a total weight of the coating liquid being 100 wt %, a content of the third resin is between 18.5 wt % and 21.5 wt %, a content of the third mixed inorganic particles is between 4 wt % and 8 wt %, and a content of the water is between 71.8 wt % and 76.8 wt %.
In one of the possible or preferred embodiments, the third resin is graft-modified by using monomers that include the following components, and a sum of the following components is 100 wt %: (a) 90 wt % to 95 wt % of a (meth)acrylate having an alkyl group; (b) 4 wt % to 9 wt % of a (meth)acrylate having a hydroxyl group; and (c) 1 wt % to 5 wt % of a vinyl monomer having a carboxyl group.
In one of the possible or preferred embodiments, in the third mixed inorganic particles, based on the total weight of the coating liquid being 100 wt %, a content of the calcium carbonate is between 0.5 wt % and 7 wt %, a content of the silicon dioxide is between 0.5 wt % and 6 wt %, and a content of the titanium dioxide is between 0.5 wt % and 2 wt %.
In one of the possible or preferred embodiments, the coating liquid further includes an additive, and the additive is at least one of an auxiliary agent, a catalyst, or a co-solvent. Based on the total weight of the coating liquid being 100 wt %, a content of the additive is between 0.5 wt % and 1 wt %.
In one of the possible or preferred embodiments, based on a total weight of the major layer being 100 wt %, a total weight of the first resin is between 85 wt % and 95 wt %, and a content of the first mixed inorganic particles is between 5 wt % and 15 wt %. Based on a total weight of each of the minor layers being 100 wt %, a content of the second resin is between 85 wt % and 95 wt %, and a content of the second mixed inorganic particles is between 5 wt % and 15 wt %. In the major layer, a content of the calcium carbonate or a content of the silicon dioxide is greater than a content of the titanium dioxide, and in each of the minor layers, the content of the titanium dioxide is greater than the content of the silicon dioxide.
In one of the possible or preferred embodiments, the coated pearl paper has a light transmittance of between 20.5% and 20.8% and a haze of between 98.1% and 98.8%.
In order to solve the above-mentioned problem, another one of the technical aspects adopted by the present disclosure is to provide a method for producing a coated pearl paper. The method includes a pearl paper forming process and a coating process. The pearl paper forming process is implemented by co-extruding polypropylene, calcium carbonate, silicon dioxide, and titanium dioxide through an extruder to form a pearl paper. The pearl paper includes a major layer and two minor layers arranged at two sides of the major layer. The major layer includes a first resin and a plurality of first mixed inorganic particles, the first resin includes polypropylene, and the first mixed inorganic particles include calcium carbonate, silicon dioxide, and titanium dioxide. Each of the minor layers includes a second resin and a plurality of second mixed inorganic particles, the second resin includes polypropylene, and the second mixed inorganic particles include calcium carbonate, silicon dioxide, and titanium dioxide. The coating process is implemented by coating a coating liquid onto the pearl paper to form a coating layer one of the minor layers of the pearl paper and form a coated pearl paper. The coating liquid includes a third resin, a plurality of third mixed inorganic particles, and water. The third resin is an acrylate graft-modified polyurethane resin, and the third mixed inorganic particles include calcium carbonate, silicon dioxide, and titanium dioxide. Based on a total weight of the coating liquid being 100 wt %, a content of the third resin is between 18.5 wt % and 21.5 wt %, a content of the third mixed inorganic particles is between 4 wt % and 8 wt %, and a content of the water is between 71.8 wt % and 76.8 wt %.
In one of the possible or preferred embodiments, the third resin is graft-modified by using monomers that include the following components, and a sum of the following components is 100 wt %: (a) 90 wt % to 95 wt % of a (meth)acrylate having an alkyl group; (b) 4 wt % to 9 wt % of a (meth)acrylate having a hydroxyl group; and (c) 1 wt % to 5 wt % of a vinyl monomer having a carboxyl group.
In one of the possible or preferred embodiments, in the third mixed inorganic particles, based on a total weight of the coating liquid being 100 wt %, a content of the calcium carbonate is between 0.5 wt % and 7 wt %, a content of the silicon dioxide is between 0.5 wt % and 6 wt %, and a content of the titanium dioxide is between 0.5 wt % and 2 wt %.
In one of the possible or preferred embodiments, the coating liquid further includes an additive, and the additive is at least one of an auxiliary agent, a catalyst, or a co-solvent. Based on the total weight of the coating liquid being 100 wt %, a content of the additive is between 0.5 wt % and 1 wt %.
In one of the possible or preferred embodiments, based on a total weight of the major layer being 100 wt %, a content of the first resin is between 85 wt % and 95 wt %, and a content of the first mixed inorganic particles is between 5 wt % and 15 wt %. Based on a total weight of each of the minor layers being 100 wt %, a content of the second resin is between 85 wt % and 95 wt %, and a content of the second mixed inorganic particles is between 5 wt % and 15 wt %. In the major layer, a content of the calcium carbonate or a content of the silicon dioxide is greater than a content of the titanium dioxide, and in each of the minor layers, the content of titanium dioxide is greater than the content of silicon dioxide.
In one of the possible or preferred embodiments, the coated pearl paper has a light transmittance of between 20.5% and 20.8%, and a haze of between 98.1% and 98.8%.
Therefore, in the coated pearl paper and the method for producing the same provided by the present disclosure, by virtue of “the coating liquid including a third resin, a plurality of third mixed inorganic particles, and water, the third resin being an acrylate graft-modified polyurethane resin, and the third mixed inorganic particles including calcium carbonate, silicon dioxide, and titanium dioxide” and “based on a total weight of the coating liquid being 100 wt %, a content of the third resin being between 18.5 wt % and 21.5 wt %, a content of the third mixed inorganic particles being between 4 wt % and 8 wt %, and a content of the water being between 71.8 wt % and 76.8 wt %,” the issue of the coating layer on the conventional pearl paper being not easily adhered by the ink can be effectively improved.
These and other aspects of the present disclosure will become apparent from the following description of the embodiment taken in conjunction with the following drawings and their captions, although variations and modifications therein may be affected without departing from the spirit and scope of the novel concepts of the disclosure.
The described embodiments may be better understood by reference to the following description and the accompanying drawings, in which:
The present disclosure is more particularly described in the following examples that are intended as illustrative only since numerous modifications and variations therein will be apparent to those skilled in the art. Like numbers in the drawings indicate like components throughout the views. As used in the description herein and throughout the claims that follow, unless the context clearly dictates otherwise, the meaning of “a,” “an” and “the” includes plural reference, and the meaning of “in” includes “in” and “on.” Titles or subtitles can be used herein for the convenience of a reader, which shall have no influence on the scope of the present disclosure.
The terms used herein generally have their ordinary meanings in the art. In the case of conflict, the present document, including any definitions given herein, will prevail. The same thing can be expressed in more than one way. Alternative language and synonyms can be used for any term(s) discussed herein, and no special significance is to be placed upon whether a term is elaborated or discussed herein. A recital of one or more synonyms does not exclude the use of other synonyms. The use of examples anywhere in this specification including examples of any terms is illustrative only, and in no way limits the scope and meaning of the present disclosure or of any exemplified term. Likewise, the present disclosure is not limited to various embodiments given herein. Numbering terms such as “first,” “second” or “third” can be used to describe various components, signals or the like, which are for distinguishing one component/signal from another one only, and are not intended to, nor should be construed to impose any substantive limitations on the components, signals or the like.
Referring to
The pearl paper 1 includes a major layer 11 and two minor layers 12 arranged at two sides of the major layer 11, the major layer 11 includes a first resin and a plurality of first mixed inorganic particles, the first resin includes polypropylene, and the first mixed inorganic particles include calcium carbonate, silicon dioxide, and titanium dioxide. Each of the minor layers 12 includes a second resin and a plurality of second mixed inorganic particles, the second resin includes polypropylene, and the second mixed inorganic particles include calcium carbonate, silicon dioxide, and titanium dioxide.
Based on a total weight of the major layer 11 being 100 wt %, a content of the first resin is between 85 wt % and 95 wt %, and a content of the first mixed inorganic particles is between 5 wt % and 15 wt %. Based on a total weight of each of the minor layers 12 being 100 wt %, a content of the second resin is between 85 wt % and 95 wt %, and a content of the second mixed inorganic particles is between 5 wt % and 15 wt %.
The major layer 11 and each of the minor layers 12 can be made only of polypropylene. In addition, in the major layer 11, a number average molecular weight of the polypropylene is between 100,000 and 200,000. In each of the minor layers 12, the number average molecular weight of the polypropylene is between 100,000 and 200,000.
Preferably, in the major layer 11, a content of the calcium carbonate or a content of the silicon dioxide is greater than a content of the titanium dioxide, and in each of the minor layers 12, the content of the titanium dioxide is greater than the content of the silicon dioxide. In the major layer 11, through cooperation of a higher content of the calcium carbonate or the silicone dioxide and a lower content of the titanium dioxide, the costs of the coated pearl paper 100 can be reduced. A thickness of each of the minor layers 12 is less than a thickness of the major layer 11, and each of the minor layers 12 is added with a higher content of the titanium dioxide, so that the coated pearl paper is white in color.
Specifically, in the major layer 11, based on a total weight of the first mixed inorganic particles being 100 wt %, the content of the calcium carbonate is between 50 wt % and 80 wt %, the content of the silicon dioxide is between 10 wt % and 20 wt %, and the content of the titanium dioxide is between 1 wt % and 10 wt %. In each of the minor layers 12, based on a total weight of the second mixed inorganic particles being 100 wt %, the content of the calcium carbonate is between 50 wt % and 80 wt %, the content of the silicon dioxide is between 1 wt % and 10 wt %, and the content of the titanium dioxide is between 10 wt % and 20 wt %. Moreover, the thickness of the major layer 11 is between 20 μm and 40 μm, and the thickness of each of the minor layers 12 is between 5 μm and 15 μm.
The coating layer 2 is formed by coating a coating liquid onto one of the minor layers 12 of the pearl paper 1. A thickness of the coating layer 12 is between 2 μm and 3 μm.
The coating liquid includes a third resin, a plurality of third mixed inorganic particles, and water. The third resin is an acrylate graft-modified polyurethane resin, and the third mixed inorganic particles include calcium carbonate, silicon dioxide, and titanium dioxide. Based on a content of the coating liquid being 100 wt %, a content of the third resin is between 18.5 wt % and 21.5 wt %, a content of the third mixed inorganic particles is between 4 wt % and 8 wt %, and a content of the water is between 71.8 wt % and 76.8 wt %. The third resin has an excellent compatibility with the pearl paper, and the third resin also has an excellent compatibility with the ink printed on the coating layer, so that the coating layer 2 is not easily stripped from the pearl paper 1, and the ink printed on the coating layer 2 is not easily stripped from the coating layer 2. In addition, the third mixed inorganic particles can adsorb pigment in the ink, thereby improving the printing quality of the ink.
The third resin is graft-modified by using monomers that include the following components, and a sum of the following components is 100 wt %: (a) 90 wt % to 95 wt % of a (meth)acrylate having an alkyl group; (b) 4 wt % to 9 wt % of a (meth)acrylate having a hydroxyl group; (c) 1 wt % to 5 wt % of a vinyl monomer having a carboxyl group. The (meth)acrylate having the alkyl group is at least one selected from the group consisting of methyl(meth)acrylate, ethyl(meth)acrylate, propyl(meth)acrylate, n-butyl(meth)acrylate, isobutyl(meth)acrylate, 2-ethylhexyl(meth)acrylate, n-octyl(meth)acrylate, isooctyl(meth)acrylate, lauryl(meth)acrylate, octearyl(meth)acrylate, cyclohexyl(meth)acrylate, methoxyethyl(meth)acrylate, and ethoxymethyl (meth)acrylate. The (meth)acrylate having the hydroxyl group is at least one selected from the group consisting of 2-hydroxyethyl(meth)acrylate, 4-hydroxybutyl (meth)acrylate, chloro2-hydroxypropyl acrylate, diethylene glycol mono(meth)acrylate, and allyl alcohol. The vinyl monomer having the carboxyl group is at least one selected from the group consisting of acrylic acid, methacrylic acid, itaconic acid, crotonic acid, maleic acid, fumaric acid, and maleic anhydride. In addition, a number average molecular weight of the polyurethane resin can be between 5,000 and 30,000.
In the third mixed inorganic particles, based on the total weight of the coating liquid being 100 wt %, the content of the calcium carbonate is between 0.5 wt % and 7 wt %, the content of the silicon dioxide is between 0.5 wt % and 6 wt %, and the content of the titanium dioxide is between 0.5 wt % and 2 wt %.
The coating liquid can further include an additive, and the additive is at least one of an auxiliary agent, a catalyst, or a co-solvent. Based on the total weight of the coating liquid being 100 wt %, a content of the additive is between 0.5 wt % and 1 wt %.
The auxiliary agent can adjust a surface tension of the coating liquid, and can improve a flatness of the coating layer 2 and a wettability between the coating layer 2 and the pearl paper 1. The catalyst can control a crosslinking reaction rate of the coating liquid. The co-solvent can control a volatilization rate of liquid components in the coating liquid.
The auxiliary agent can be a silicon-containing additive, a fluorine-containing additive, or an additive containing silicon and fluorine. The silicon-containing additive can be BYK307, BYK325, BYK331, BYK380N, or BYK381 from BYK. The fluorine-containing additive can be FC-4430 and FC-4432 from 3M Company, Zonyl FSN-100 from DuPont de Nemours, Inc. of the United States, or DSX from Daikin Industries, Ltd. The additive containing silicon and fluorine can be BYK346, BYK347, or BYK348 from BYK.
The catalyst can be metal salts, inorganic substances, salts, organic substances, alkaline substances, or acidic substances. The co-solvent is at least one selected from the group consisting of methanol, ethanol, n-propanol, isopropanol, butanol, dimethylstyrene, acetone, and tetrahydrofuran solvents.
The coated pearl paper 100 has a light transmittance of between 20.5% and 20.8% and a haze of between 98.1% and 98.8%.
Referring to
In the pearl paper forming process S110, polypropylene, calcium carbonate, silicon dioxide, and titanium dioxide are co-extruded through an extruder to form a pearl paper 1. The pearl paper 1 includes a major layer 11 and two minor layers 12 arranged at two sides of the major layer 11. The major layer 11 includes a first resin and a plurality of first mixed inorganic particles, the first resin includes polypropylene, and the first mixed inorganic particles include calcium carbonate, silicon dioxide, and titanium dioxide. Each of the minor layers 12 includes a second resin and a plurality of second mixed inorganic particles, the second resin includes polypropylene, and the second mixed inorganic particles include calcium carbonate, silicon dioxide, and titanium dioxide.
Based on a total weight of the major layer 11 being 100 wt %, a content of the first resin is between 85 wt % and 95 wt %, and a content of the first mixed inorganic particles is between 5 wt % and 15 wt %. Based on a total weight of each of the minor layers being 100 wt %, a content of the second resin is between 85 wt % and 95 wt %, and a content of the second mixed inorganic particles is between 5 wt % and 15 wt %. In the major layer 11, a content of the calcium carbonate or a content of the silicon dioxide is greater than a content of the titanium dioxide, and in each of the minor layers 12, the content of the titanium dioxide is greater than the content of the silicon dioxide.
In the coating process S120, a coating liquid is coated onto the pearl paper 1, so as to form a coating layer 2 on one of the minor layers 2 of the pearl paper 1 and form a coated pearl paper 100. The coating liquid includes a third resin, a plurality of third mixed inorganic particles, and water. The third mixed inorganic particles include calcium carbonate, silicon dioxide, and titanium dioxide. Based on a total weight of the coating liquid being 100 wt %, a content of the third resin is between 18.5 wt % and 21.5 wt %, a content of the third mixed inorganic particles is between 4 wt % and 8 wt %, and a content of the water is between 71.8 wt % and 76.8 wt %.
In addition, before the coating process S120 and after the pearl paper forming process S110, the method can further include a biaxially-stretching process. In the biaxially-stretching process, the pearl paper having a three-layered structure is biaxially-stretched. The above-mentioned biaxially-stretching process can be performed through, for example, a longitudinal uniaxial stretching method, a transverse uniaxial stretching method, a vertical-axis sequential biaxial stretching method, or a vertical-axis simultaneous biaxial stretching method, and the present disclosure is not limited thereto. For example, in the above-mentioned biaxially-stretching process, an un-stretched pearl paper is preheated at an extension temperature (e.g., within a range from 50° C. to 150° C.). Then, a stretching process is carried out in a width direction (i.e., a transverse direction, TD) of the un-stretched pearl paper according to different elongation ratios, and the stretching process is further carried out in a length direction (i.e., a machine direction, MD) of the un-stretched pearl paper.
The third resin is graft-modified by using monomers that include the following components, and a sum of the following components is 100 wt %: (a) 90 wt % to 95 wt % of a (meth)acrylate having an alkyl group; (b) 4 wt % to 9 wt % of a (meth)acrylate having a hydroxyl group; and (c) 1 wt % to 5 wt % of a vinyl monomer having a carboxyl group.
In the third mixed inorganic particles, based on the total weight of the coating liquid being 100 wt %, a content of the calcium carbonate is between 0.5 wt % and 7 wt %, a content of the silicon dioxide is between 0.5 wt % and 6 wt %, and a content of the titanium dioxide is between 0.5 wt % and 2 wt %.
The coating liquid further includes an additive, and the additive is at least one selected from the group consisting of an auxiliary agent, a catalyst, and a co-solvent. Based on the total weight of the coating liquid being 100 wt %, a content of the additive is between 0.5 wt % and 1 wt %.
The coated pearl paper 100 has a light transmittance o between 20.5% and 20.8% and a haze of between 98.1% and 98.8%.
Hereinafter, a more detailed description will be provided with reference to Exemplary Examples 1 to 5 and Comparative Examples 1 to 3. However, the following Exemplary Examples are only used to aid in understanding of the present disclosure, and are not to be construed as limiting the scope of the present disclosure.
In Exemplary Examples 1 to 5 and Comparative Examples 1 to 3, different coating liquids are coated onto the same pearl paper. The major layer of the pearl paper includes 70 wt % of the polypropylene, 21 wt % of the calcium carbonate, 6 wt % of the silicon dioxide, and 3 wt % of the titanium dioxide. Each of the minor layers of the pearl paper includes 70 wt % of the polypropylene, 21 wt % of the calcium carbonate, 3 wt % of the silicon dioxide, and 6 wt % of the titanium dioxide.
In Exemplary Example 1, the coating liquid includes 18.5 wt % of the acrylate graft-modified polyurethane resin, 4 wt % of the third mixed inorganic particles, 76.8 wt % of the water, and 0.7 wt % of the additive. The thickness of the coating layer is 2.2 μm. The third mixed inorganic particles include 3.4 wt % of the calcium carbonate, 0.5 wt % of the silicon dioxide, and 0.1 wt % of the titanium dioxide.
In Exemplary Example 2, the coating liquid includes 18.5 wt % of the acrylate graft-modified polyurethane resin, 6 wt % of the third mixed inorganic particles, 74.8 wt % of the water, and 0.7 wt % of the additive. The thickness of the coating layer is 2.5 μm. The third mixed inorganic particles include 5.4 wt % of the calcium carbonate, 0.5 wt % of the silicon dioxide, and 0.1 wt % of the titanium dioxide.
In Exemplary Example 3, the coating liquid includes 18.5 wt % of the acrylate graft-modified polyurethane resin, 8 wt % of the third mixed inorganic particles, 72.8 wt % of the water, and 0.7 wt % of the additive. The thickness of the coating layer is 2.5 μm. The third mixed inorganic particles include 7.4 wt % of the calcium carbonate, 0.5 wt % of the silicon dioxide, and 0.1 wt % of the titanium dioxide.
In Exemplary Example 4, the coating liquid includes 20 wt % of the acrylate graft-modified polyurethane resin, 6 wt % of the third mixed inorganic particles, 73.3 wt % of the water, and 0.7 wt % of the additive. The thickness of the coating layer is 2.8 μm. The third mixed inorganic particles include 5.4 wt % of the calcium carbonate, 0.5 wt % of the silicon dioxide, and 0.1 wt % of the titanium dioxide.
In Exemplary Example 5, the coating liquid includes 21.5 wt % of the acrylate graft-modified polyurethane resin, 6 wt % of the third mixed inorganic particles, 71.8 wt % of the water, and 0.7 wt % of the additive. The thickness of the coating layer is 3 μm. The third mixed inorganic particles include 5.4 wt % of the calcium carbonate, 0.5 wt % of the silicon dioxide, and 0.1 wt % of the titanium dioxide.
In Comparative Example 1, the coating liquid includes 24.5 wt % of the acrylate graft-modified polyurethane resin, 0.05 wt % of the third mixed inorganic particles, 74.8 wt % of the water, and 0.7 wt % of the additive. The thickness of the coating layer is 3 μm. The third mixed inorganic particles include 0.030 wt % of the calcium carbonate, 0.015 wt % of the silicon dioxide, and 0.005 wt % of the titanium dioxide.
In Comparative Example 2, the coating liquid includes 14.8 wt % of the acrylate graft-modified polyurethane resin, 4.8 wt % of the third mixed inorganic particles, 79.7 wt % of the water, and 0.7 wt % of the additive. The thickness of the coating layer is 0.8 μm. The third mixed inorganic particles include 4.2 wt % of the calcium carbonate, 0.5 wt % of the silicon dioxide, and 0.1 wt % of the titanium dioxide.
In Comparative Example 3, the coating liquid includes 6.5 wt % of the acrylate graft-modified polyurethane resin, 18 wt % of the third mixed inorganic particles, 74.8 wt % of the water, and 0.7 wt % of the additive. The thickness of the coating layer is 3 μm. The third mixed inorganic particles include 15.0 wt % of the calcium carbonate, 2.5 wt % of the silicon dioxide, and 0.5 wt % of the titanium dioxide.
For the coated pearl paper of each of Exemplary Examples 1 to 5 and Comparative Examples 1 to 3, components and the thickness of the coating layer, and the light transmittance, the haze, the glossiness, the adhesion, the printing quality, and the printing fastness of the coated pearl paper are listed in Table 1 below. The relevant test methods are also described as follows.
A light transmittance test is carried out by using a haze meter (model: TC-H III DPK).
A haze test is carried out by using a haze meter (model: TC-H III DPK).
A glossiness test is carried out by using a glossiness meter (model: ZGM1110.268).
An adhesion test is carried out by using a 3M tape/cross-cut tester.
A printing quality test is carried out by observing a printing appearance and an image resolution.
A printing fastness test is carried out by using a 3M tape/cross-cut tester.
A surface roughness test of the coating layer is carried out by using a 3D laser microscope.
In Exemplary Examples 1 to 5, since the content of the third resin is between 18.5 wt % and 21.5 wt %, the content of the third mixed inorganic particles is between 4 wt % and 8 wt %, and the content of the water is between 71.8 wt % and 76.8 wt %. The thickness of the coating layer is between 2.2 μm and 3 μm. The coated pearl paper has a light transmittance of between 20.5% and 20.8%, a haze of between 98.1% and 98.7%, a glossiness of between 5.1 GU to 5.9 GU, an excellent adhesion, an excellent printing quality, and an excellent printing fastness. Furthermore, the coating layer has a surface roughness (Ra) of between 0.55 μm and 0.728 μm.
In Comparative Example 1, the content of the third mixed inorganic particles is too low, so that the glossiness of the coated pearl paper is high, an absorbency of a UV ink is poor, and the printing quality is NG. In Comparative Example 2, since the thickness of the coating layer is too low, the printing quality of the coated pearl paper is NG, and the printing fastness with the UV ink is NG. In Comparative Example 3, since the content of the third mixed particles is too high, the coating layer peels off, and the printing fastness of the coating layer, the pearl paper, and the UV ink is NG.
In conclusion, in the coated pearl paper and the method for producing the same provided by the present disclosure, by virtue of “the coating liquid including a third resin, a plurality of third mixed inorganic particles, and water, the third resin being an acrylate graft-modified polyurethane resin, and the third mixed inorganic particles including calcium carbonate, silicon dioxide, and titanium dioxide” and “based on a total weight of the coating liquid being 100 wt %, a content of the third resin being between 18.5 wt % and 21.5 wt %, a content of the third mixed inorganic particles being between 4 wt % and 8 wt %, and a content of the water being between 71.8 wt % and 76.8 wt %,” the issue of the coating layer on the conventional pearl paper being not easily adhered by the ink can be effectively improved.
The foregoing description of the exemplary embodiments of the disclosure has been presented only for the purposes of illustration and description and is not intended to be exhaustive or to limit the disclosure to the precise forms disclosed. Many modifications and variations are possible in light of the above teaching.
The embodiments were chosen and described in order to explain the principles of the disclosure and their practical application so as to enable others skilled in the art to utilize the disclosure and various embodiments and with various modifications as are suited to the particular use contemplated. Alternative embodiments will become apparent to those skilled in the art to which the present disclosure pertains without departing from its spirit and scope.
| Number | Date | Country | Kind |
|---|---|---|---|
| 112143602 | Nov 2023 | TW | national |
