A method for forming polymer nano-stone-based paper

Abstract

The invention discloses a polymer nano-stone-based paper forming method, comprising the following steps: adding a proper amount of auxiliary raw materials to calcium carbonate, polyethylene and other main component raw materials and entering a high-speed mixer for modification treatment, performing banburying and granulation after the modification treatment to produce papermaking masterbatch for standby use, drying the standby papermaking masterbatch and entering a cast papermaking device, further banburying treatment by a single-screw heating type banburying mixer, flowing out from a special cast paper die head, initially cooling and shaping by a cast paper shaping device, then further cooling by a cooling roller group, cutting to the finished product width by a trimmer, and finally entering an automatic winding device, automatically cutting the paper according to a set length, automatically changing the roller and automatically placing the roller on a ground support plate, effectively solving the problems that in the production and shaping process of the existing nano-level stone-based paper, the surface of the paper without eliminating static electricity is prone to wrinkles, which is not conducive to winding, and the thickness of the paper is not easy to adjust.

Description

Technical Field

[0001] The invention relates to the field of polymer nano-stone-based paper production, in particular to a polymer nano-stone-based paper forming method. Background Art

[0002] Polymer nano-stone-based paper, commonly known as stone paper, is a kind of paper formed by mixing polymer materials with calcium carbonate materials produced by stone crushing. Compared with modern paper, stone-based paper has the advantages of being waterproof, moisture-proof, oil-resistant, tear-resistant, good flatness, and good surface smoothness. The biggest advantage is that the production process of stone paper saves energy and almost no industrial wastewater is generated. It is gradually becoming popular. In the process of production and shaping of existing nano-level stone-based paper, the surface of the paper that has not eliminated static electricity is prone to wrinkles, which is not conducive to the winding of the paper. Some blow-molded stone paper production methods require calculation and adjustment of factors such as the flow rate of the material and the blowing speed to control the forming thickness of the paper. In addition, the blow-molded stone paper production method is easily affected by the airflow inside the factory, resulting in the thickness of the paper being difficult to adjust during the paper forming process. In view of the above problems, a polymer nano-stone-based paper forming method is proposed. Summary of the invention

[0003] The object of the present invention is to provide a polymer nano-stone-based paper forming method to solve the problems raised in the above background technology.

[0004] To achieve the above object, the present invention provides the following technical solution: a polymer nano-stone-based paper forming method, comprising the following steps:

[0005] The first step is to add calcium carbonate, polyethylene and other main raw materials, and appropriate amount of auxiliary raw materials into a high-speed mixer for modification;

[0006] In the second step, the modified and evenly mixed materials are fed into the twin-screw extruder through an elevator. After heating and stirring by the special twin-screw, the raw materials undergo plasticization reaction, and then undergo mixing and granulation to produce papermaking masterbatch for standby use.

[0007] In the third step, the standby papermaking masterbatch is dried and then enters the cast papermaking equipment. After further mixing in a single-screw heated internal mixer, it flows out from a special cast die head and is initially cooled and shaped in a cast shaping equipment.

[0008] In the fourth step, it is then further cooled by a cooling roller group and cut to the finished width by a trimming machine;

[0009] The fifth step is to enter the automatic winding device, automatically cut the paper according to the set length, automatically change the roll and automatically place the roll on the ground support plate.

[0010] Preferably, in the first step, the mixing speed of the high-speed mixer can be freely adjusted from 600 to 1800 revolutions per minute.

[0011] Preferably, the fineness of the main raw materials such as calcium carbonate is above 1300 mesh.

[0012] Preferably, in the third step, the rotation speed of the casting setting device is adjusted to adjust the paper thickness.

[0013] Preferably, in the fourth step, the cut edge material is automatically recycled by an automatic edge trimming machine.

[0014] Preferably, in the fourth step, the cut paper is passed through a corona treatment machine to eliminate static electricity and increase the tension and toughness of the paper.

[0015] Preferably, in the second step, the length of the granulated particles produced by the twin-screw extruder is between 5 and 8 mm.

[0016] Preferably, in the third step, the heating temperature of the twin-screw extruder is between 230°C and 250°C.

[0017] Preferably, in the third step, the cast body after banburying forms a molten fluid at a temperature between 240°C and 270°C.

[0018] Compared with the prior art, the beneficial effects of the present invention are as follows: the present invention promotes paper forming by casting the plasticized raw materials after granulation and banburying through a special die head and then shaping them twice; during the shaping process, the fluidity is reduced through a preliminary cooling, but its ductility is retained; the shaping thickness of the paper is adjusted by adjusting the rotation speed of the shaping equipment, and static electricity is eliminated through a corona treatment machine to improve the tension and toughness of the paper, effectively solving the problem that in the existing nano-stone-based paper production and shaping process, the surface of the paper that has not eliminated static electricity is prone to wrinkles, which is not conducive to winding, and the thickness of the paper is not easy to adjust. DETAILED DESCRIPTION

[0019] The technical solutions in the embodiments of the present invention are described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0020] The present invention provides a technical solution: a polymer nano-stone-based paper forming method, comprising the following steps:

[0021] In the first step, calcium carbonate, polyethylene and other main raw materials are added with appropriate amounts of auxiliary raw materials into a high-speed mixer for modification. The raw materials and formulas for paper production mentioned in the present invention are all prior art, so they are not described in detail in the present invention;

[0022] In the second step, the modified and evenly mixed materials are fed into the twin-screw extruder through an elevator. After heating and stirring by the special twin-screw, the raw materials undergo a plasticizing reaction, and then undergo mixing and granulation to produce papermaking masterbatch for use. When producing paper, the finer the powder, the larger the specific surface area, the worse the fluidity, and it is not easy to evenly fill the special die head during molding. The molded parts often have cavities, loose corners, layer cracks, and elastic failure. Therefore, the granulation process is used to solve this problem;

[0023] In the third step, the standby papermaking masterbatch is dried and then enters the cast papermaking equipment. After further mixing in a single-screw heated internal mixer, it flows out from a special cast die head and is initially cooled and shaped in a cast shaping equipment. After initial cooling, the paper still has a certain ductility due to its certain temperature.

[0024] In the fourth step, the paper is further cooled by the cooling roller group, and then cut to the finished width by the trimming machine. After cooling again, the paper is completely shaped;

[0025] The fifth step is to enter the automatic winding device, automatically cut the paper according to the set length, automatically change the roll and automatically place the roll on the ground support plate.

[0026] Specifically, in the first step, the mixing speed of the high-speed mixer can be freely adjusted from 600 to 1800 revolutions per minute to facilitate the mixing of materials with different formulations.

[0027] Specifically, the fineness of main ingredient raw materials such as calcium carbonate is above 1300 mesh.

[0028] Specifically, in the third step, the speed of the cast film setting device is adjusted to adjust the thickness of the paper. When the speed of the setting device is adjusted, the ductility of the paper that has not been completely cooled will be affected by the speed of the setting device, and it will be stretched or smoothly conveyed. Therefore, when the speed is increased, the conveying roller is in a stretching state, and the thickness of the paper becomes thinner. When conveying smoothly or even reducing the speed, the conveying roller is in a conveying or reverse conveying state, so the thickness of the paper will become thicker.

[0029] Specifically, in the fourth step, the cut edge materials are automatically recycled by an automatic edge trimming machine.

[0030] Specifically, in the fourth step, the cut paper passes through a corona treatment machine to eliminate static electricity and increase the tension and toughness of the paper.

[0031] Specifically, in the second step, the length of the granulated particles of the twin-screw extruder is between 5 and 8 mm, which is convenient for the feeding of the internal mixer and the casting operation of the special die head.

[0032] Specifically, in the third step, the heating temperature of the twin-screw extruder is between 230°C and 250°C.

[0033] Specifically, in the third step, the cast body after internal kneading forms a molten fluid at a temperature between 240°C and 270°C.

[0034] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A method for forming polymer nano-stone-based paper, It is characterized by the following steps: In the first step, the main ingredients of calcium carbonate and polyethylene are added with appropriate amounts of auxiliary raw materials into a high-speed mixer for modification; In the second step, the modified and evenly mixed materials are fed into the twin-screw extruder through the elevator. After heating, the special twin-screws are stirred to make the raw materials plasticized, and then the mixing and granulation are carried out to produce papermaking masterbatch for standby use. The heating temperature of the twin-screw extruder is between 230℃ and 250℃. In the third step, the prepared papermaking masterbatch is dried and then enters the cast papermaking equipment. After further mixing in a single-screw heated internal mixer, it flows out from a special cast die head and is initially cooled and formed in a cast shaping equipment. The cast body after mixing forms a molten fluid at a temperature between 240°C and 270°C. In the fourth step, the paper is further cooled by a cooling roller group, and then cut to the finished width by a trimming machine. The cut paper is then passed through a corona treatment machine to eliminate static electricity and increase the tension and toughness of the paper. The fifth step is to enter the automatic winding device, automatically cut the paper according to the set length, automatically change the roll and automatically place the roll on the ground support plate.

2. A polymer nano-stone-based paper forming method according to claim 1, characterized in that: In the first step, the mixing speed of the high-speed mixer can be freely adjusted from 600 to 1800 revolutions per minute.

3. A polymer nano-stone-based paper forming method according to claim 1, characterized in that: In the third step, the paper thickness can be adjusted by adjusting the rotation speed of the cast forming equipment.

4. A polymer nano-stone-based paper forming method according to claim 1, characterized in that: In the fourth step, the cut edges are automatically recycled by an automatic edge trimming machine.

5. The method for forming polymer nano-stone-based paper according to claim 1, characterized in that: In the second step, the twin-screw extruder pelletizes the pellets to a length between 5 and 8 mm.