A method for manufacturing a recyclable high barrier paper

Abstract

The application discloses a kind of recyclable high-barrier paper manufacturing method, comprising the following steps: step one: first, PEG material is heated, so that PEG material is melted;Step two: by the method of extrusion coating, melt PEG material is coated on the surface of paper, to solve the flatness of paper;Step three: on this basis, again, water-based material is coated, so that its surface has the ability to resist 200 DEG C or more;Step four: finally, the paper with the surface that can resist 200 DEG C temperature is evaporated by evaporation equipment, and a barrier layer is evaporated on the surface, if it is not thick enough in the process of evaporation, then it is evaporated again by entering the next level evaporation equipment, and then it becomes recyclable high-barrier paper;The paper is coated with silicon oxide, and then does not need to be separated in the recycling process, and will be separated to the bottom of the pulp tank due to the difference in density with the pulp after being broken, and at the same time, there is no environmental problem in silicon dioxide itself, and returning to soil does not cause pollution or environmental problems.

Description

Technical Field

[0001] This invention relates to the field of paper manufacturing technology, specifically to a method for manufacturing recyclable high-barrier paper. Background Technology

[0002] Currently, plastic film barrier layers do not comply with environmental protection policies, and various packaging materials are gradually adopting recyclable high-barrier materials. For paper as the base material, the first issue to be addressed is the flatness of the paper, and the second is its high-temperature resistance during the vapor deposition process.

[0003] Existing high-barrier papers have the following shortcomings:

[0004] Current high-barrier materials are mostly plastic films, which provide barrier properties by using three layers of paper sandwiched with two layers of film. To recycle such packaging paper, the plastic film sandwiched in the middle must first be separated.

[0005] Paper generally has wrinkles and is elastic, but these wrinkles and elasticity are not conducive to the deep processing of paper.

[0006] Meanwhile, some papers require solutions to improve their flatness and smoothness, and PEG materials are used to address these issues. Although PEG materials solve the wrinkles and smoothness of stretchable paper, their melting point is less than 60°C, which limits the use or further processing of the paper. Summary of the Invention

[0007] The purpose of this invention is to provide a method for manufacturing recyclable high-barrier paper to solve the related problems mentioned in the background art.

[0008] To achieve the above objectives, the present invention provides the following technical solution: a method for manufacturing recyclable high-barrier paper, comprising the following steps:

[0009] Step 1: First, heat the PEG material to melt it;

[0010] Step 2: Apply molten PEG material to the paper surface using an extrusion coating method to improve the paper's smoothness;

[0011] Step 3: On this basis, apply a water-based material to make its surface able to withstand temperatures above 200°C;

[0012] Step 4: Finally, the paper with a surface that can withstand temperatures of 200°C is passed through a vapor deposition device to deposit a barrier layer. If the thickness is not thick enough during the vapor deposition process, it will be sent to the next stage of vapor deposition device for another vapor deposition, thus making it recyclable high-barrier paper.

[0013] Preferably, the water-based material in step two is an acrylic water-based coating, and the acrylic water-based coating is an acrylic resin.

[0014] Preferably, the barrier layer described in step four has a thickness of 25 μm to 100 μm, and the barrier layer is made of silicon oxide material.

[0015] Preferably, the heating temperature in step one is 60°C.

[0016] Preferably, in step two, the paper is immersed in molten PEG material for coating treatment, and the coating amount is 30-250 g / m². 2 .

[0017] Preferably, the PEG material is coated on the paper surface and then extruded using two rollers or a rolling mill to bond the two together.

[0018] Preferably, the coating method described in step two involves one or two coatings depending on the paper thickness and elasticity.

[0019] Compared with the prior art, the present invention provides a method for manufacturing recyclable high-barrier paper, which has the following beneficial effects:

[0020] 1. Because the paper uses a silicon dioxide coating, it does not need to be separated during the recycling process. After being crushed, it will settle to the bottom of the pulp tank due to its different density from the paper pulp, thus achieving separation. At the same time, silicon dioxide itself has no environmental problems, and its return to the soil will not cause pollution or environmental problems.

[0021] 2. During the manufacturing process, the paper is coated with PEG extrusion coating to solve the problems of paper flatness and smoothness. After coating, environmentally friendly modified hybrid water-based materials are used to enable it to withstand 200℃, thus solving the problem of low tolerance of PEG materials. Then, within the tolerance time limit, it is sent to a vacuum evaporation equipment for silicon oxide evaporation to obtain paper with high barrier properties. Attached Figure Description

[0022] Figure 1 This is a flowchart of the present invention. Detailed Implementation

[0023] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0024] Please see Figure 1This invention provides a technical solution: a method for manufacturing recyclable high-barrier paper, comprising the following steps:

[0025] Step 1: First, heat the PEG material to melt it;

[0026] Step 2: Apply molten PEG material to the paper surface using an extrusion coating method to improve the paper's smoothness;

[0027] Step 3: On this basis, apply a water-based material to make its surface able to withstand temperatures above 200°C;

[0028] Step 4: Finally, the paper with a surface that can withstand temperatures of 200°C is passed through a vapor deposition device to deposit an environmentally friendly heat-resistant layer to form a barrier layer. If the thickness is not thick enough during the vapor deposition process, it will be transferred to the next stage of vapor deposition equipment for another vapor deposition, thus making it a recyclable high-barrier paper.

[0029] Preferably, the water-based material applied in step two is an acrylic water-based coating, and the acrylic water-based coating is an acrylic resin, which has good weather resistance, decorative and coating properties, and can withstand 200°C after drying, thus improving the heat resistance of the paper.

[0030] Preferably, the barrier layer in step four has a thickness of 25μm to 100μm and is made of silicon oxide material to improve the barrier effect of the paper.

[0031] Preferably, the heating temperature in step one is 60°C. The melting point of PEG material is below 60°C, and the PEG material can be melted at a temperature of 60°C, thereby being coated onto the surface of the paper.

[0032] Preferably, in step two, the paper is extruded and coated using molten PEG material, with a coating amount of 30–250 g / m². 2 It can be applied to wrinkled paper to increase smoothness. Different thicknesses can be extruded depending on the wrinkles and elasticity of the paper to suit the paper.

[0033] Preferably, after the PEG material is coated on the paper surface, it is pressed together by two rollers or a roller to improve the bonding effect and ensure the flatness of the paper.

[0034] Preferably, the coating method in step two involves one or two coatings depending on the paper thickness and elasticity, which improves the flatness and smoothness of the paper surface and thus improves the quality of the paper.

[0035] Example 1: In the coating process, the PEG material is first heated to 60°C to melt it. Then, the extrusion coating method is used to coat the stretchable paper to improve its flatness and smoothness. Next, an environmentally friendly modified hybrid water-based material is coated onto the PEG material to enable it to withstand 200°C. Finally, within the withstand time limit, the paper is sent to a vacuum evaporation equipment for silicon oxide evaporation to obtain paper with high barrier properties. The thickness of the barrier layer is controlled by the paper winding speed. If the thickness is still insufficient, the paper is sent to the next stage of evaporation equipment for further evaporation. A double-sided temperature-controlled vacuum evaporation equipment is used during evaporation to achieve a thicker evaporation layer.

[0036] Example 2: When paper needs to be recycled, it will first be crushed. Since the outer coating is silicon dioxide, it will settle to the bottom of the pulp tank after being crushed because the density is different from that of the pulp, thus achieving separation. Furthermore, it will be directly returned to the soil during processing without causing pollution or environmental problems.

[0037] Finally, it should be noted that the above content is only used to illustrate the technical solution of the present invention, and is not intended to limit the scope of protection of the present invention. Simple modifications or equivalent substitutions made by those skilled in the art to the technical solution of the present invention do not depart from the essence and scope of the technical solution of the present invention.

Claims

1. A method for manufacturing recyclable high-barrier paper, characterized in that, Includes the following steps: Step 1: First, heat the PEG material to melt it; Step 2: Apply molten PEG material to the paper surface using an extrusion coating method to improve the paper's smoothness; Step 3: On this basis, apply a water-based material to make its surface able to withstand temperatures above 200°C. The water-based material is an acrylic water-based coating, and the acrylic water-based coating is an acrylic resin. Step 4: Finally, the paper with a surface that can withstand a temperature of 200℃ is passed through a vapor deposition device to deposit a barrier layer. If the thickness is not thick enough during the vapor deposition process, it will be sent to the next stage of vapor deposition device for vapor deposition again, and then it will become a recyclable high-barrier paper. The barrier layer is made of silicon oxide material.

2. The method for manufacturing recyclable high-barrier paper according to claim 1, characterized in that: The barrier layer described in step four has a thickness of 25μm to 100μm.

3. The method for manufacturing recyclable high-barrier paper according to claim 1, characterized in that: The heating temperature described in step one is 60℃.

4. The method for manufacturing recyclable high-barrier paper according to claim 1, characterized in that: In step two, the paper is immersed in molten PEG material for coating, with a coating amount of 30–250 g / m². 2 .

5. The method for manufacturing recyclable high-barrier paper according to claim 1, characterized in that: The PEG material is coated on the paper surface and then pressed together using two rollers or a rolling mill.

6. The method for manufacturing recyclable high-barrier paper according to claim 1, characterized in that: The coating method described in step two can be either a single coating or a double coating, depending on the paper thickness and elasticity.

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