阅读说明：本技术 一种合成纸的制造方法 (Method for manufacturing synthetic paper ) 是由 林小松 吕达民 于 2018-07-25 设计创作，主要内容包括：本发明涉及一种合成纸的制造方法,所述合成纸包括第一表层、第二表层和芯层；所述第一表层的表面粗糙度小于0.100微米,所述第一表层的原料包括0-40％重量的非迁移性抗静电剂,其余为均聚聚丙烯、共聚聚丙烯或者均聚聚丙烯与共聚聚丙烯的混合物；所述芯层的原料包括5-30％重量的有机发泡材料、钛白粉0-15％重量、迁移性抗静电剂0-10％重量,其余为均聚聚丙烯。所述合成纸还包括第一次表层和第二次表层。所述方法包括挤出步骤、冷却步骤、纵拉步骤、横拉步骤。采用本发明实施例的方法制造的合成纸,其第一表面具有具有低静电效果,底纸对静电保护膜的吸附性好,平整度高,且静电保护膜容易从第一表面上揭开。(The invention relates to a method for manufacturing synthetic paper, which comprises a first surface layer, a second surface layer and a core layer; the surface roughness of the first surface layer is less than 0.100 micron, the raw material of the first surface layer comprises 0-40 wt% of non-migratory antistatic agent, and the balance is homopolymerized polypropylene, copolymerized polypropylene or a mixture of homopolymerized polypropylene and copolymerized polypropylene; the core layer comprises the raw materials of 5-30 wt% of organic foaming material, 0-15 wt% of titanium dioxide, 0-10 wt% of migration antistatic agent and the balance of homopolymerized polypropylene. The synthetic paper further includes a first secondary surface layer and a second secondary surface layer. The method comprises an extrusion step, a cooling step, a longitudinal drawing step and a transverse drawing step. The first surface of the synthetic paper manufactured by the method of the embodiment of the invention has low static electricity effect, the base paper has good adsorptivity to the static electricity protective film and high flatness, and the static electricity protective film is easy to be uncovered from the first surface.)

1. A method of manufacturing synthetic paper having a multi-layer laminated composite structure comprising a first surface layer, a second surface layer and a core layer, the core layer being disposed between the first surface layer and the second surface layer; the surface roughness of the first surface layer of the synthetic paper is less than 0.100 micron, the raw material of the first surface layer comprises 0-40% by weight of non-migratory antistatic agent, and the balance is homo-polypropylene, co-polypropylene or the mixture of homo-polypropylene and co-polypropylene; the core layer comprises the raw materials of 5-30 wt% of organic foaming material, 0-15 wt% of titanium dioxide, 0-10 wt% of migration antistatic agent and the balance of homopolymerized polypropylene; characterized in that the method comprises the following steps:

an extrusion step: drying each layer of raw materials in the multilayer structure of the synthetic paper at 40-100 ℃, uniformly stirring, and co-extruding and molding each layer of raw materials after stirring according to the laminated structure to form a multilayer composite lamination;

and (3) cooling: cooling the extruded composite laminate;

longitudinally drawing: preheating the composite lamination in the advancing direction of the composite lamination, wherein the preheating temperature is 150 ℃ in the process of 120-;

transversely pulling: preheating the longitudinally-drawn composite laminated sheet at the working temperature of 150-180 ℃, gradually reducing the preheating temperature in the advancing direction of the composite laminated sheet, then transversely stretching the preheated composite laminated sheet, wherein the working temperature of a transverse stretching area is 130-170 ℃, shaping the transversely-stretched composite laminated sheet at the working temperature of 150-180 ℃, and cooling the shaped composite laminated sheet to 30-60 ℃ to form the film.

2. The method of claim 1, wherein: in the extrusion step, the working temperature is 220-300 ℃.

3. The method of claim 1, wherein: in the cooling step, the extruded laminate of the composition is applied to the surface of a first cooling roll, and immersed in a cooling water bath on the lower side of the first cooling roll as the first cooling roll rotates.

4. The method of claim 3, wherein: in the cooling step, a cooling medium circulation passage is arranged in the first cooling roller, cooling water circulates in the cooling water tank, the working temperature of the cooling roller is 15-60 ℃, and the working temperature of the cooling water tank is 18-70 ℃.

5. The method of claim 3 or 4, wherein: in the cooling step, an air stream having a pressure is released and applied to the back side of the composite laminate initially in contact with the surface of the first chill roll to drive air out from between the composite laminate and the first chill roll so that the composite laminate is in intimate contact with the surface of the first chill roll.

6. The method of claim 1, wherein: during the longitudinal drawing, the composite laminate is preheated by sequentially arranging a plurality of preheating rollers in the advancing direction of the composite laminate, the preheating rollers being circularly heated by hot oil.

7. The method of claim 1 or 6, wherein: during longitudinal drawing, the preheated composite laminate is longitudinally drawn by a plurality of drawing rolls in the advancing direction by means of the difference of the rotating speed.

8. The method of claim 1, wherein: in the cross-draw step, the advancing composite stack is preheated in a heat exchanger.

9. The method of claim 1, wherein: the method also comprises a traction winding step, wherein the biaxially oriented film is cooled to below 40 ℃ by a second cooling roller and then wound and wound by a traction device.

10. The method of claim 9, wherein: in the traction and rolling step, after the film passes through the second cooling roller, the thickness of the film is detected, and the opening height of each flow channel of the die head is adjusted according to detection data, so that the thickness of the film can be adjusted.

11. The method of claim 9 or 10, wherein: in the transverse drawing step, the composite laminated sheet is clamped on two side edges of the composite laminated sheet through a clamping device, the composite laminated sheet is transversely drawn,

in the traction and winding step, after the film passes through a second cooling roller, the film outside the clamping positions of the clamping devices on the two sides of the film is cut off.

12. The method of claim 11, wherein: in the extrusion step, the width of one flow channel of the die may be set to be wider than the width of the other flow channels according to the clamping position of the clamping device.

Technical Field

The invention belongs to the technical field of polymer films, and particularly relates to a manufacturing method of synthetic paper.

Background

With the increasing development of flat panel display technology, a variety of flat panel display devices are appearing in the market. The top layer of the display screen of the flat panel display device is a transparent glass panel or a panel made of other materials, and the display screen panel is in a sheet shape and has certain hardness. A display screen panel of a smart phone is a typical display screen panel, and is generally manufactured by cutting a large-sized panel into a plurality of small-sized panels of a specific size, and then transporting the cut display screen panel to an assembly process of a display production line, and mounting the cut display screen panel on a top layer of the display screen.

Disclosure of Invention

In order to solve the above technical problem, an embodiment of the present invention provides a method for manufacturing synthetic paper, where the synthetic paper has a multilayer laminated composite structure, and includes a first surface layer, a second surface layer, and a core layer, and the core layer is disposed between the first surface layer and the second surface layer; the surface roughness of the first surface layer of the synthetic paper is less than 0.100 micron, the raw material of the first surface layer comprises 0-40% by weight of non-migratory antistatic agent, and the balance is homo-polypropylene, co-polypropylene or the mixture of homo-polypropylene and co-polypropylene; the core layer comprises the raw materials of 5-30 wt% of organic foaming material, 0-15 wt% of titanium dioxide, 0-10 wt% of migration antistatic agent and the balance of homopolymerized polypropylene; the method comprises the following steps:

an extrusion step: drying each layer of raw materials in the multilayer structure of the synthetic paper at 40-100 ℃, uniformly stirring, and co-extruding and molding each layer of raw materials after stirring according to the laminated structure to form a multilayer composite lamination;

and (3) cooling: cooling the extruded composite laminate;

longitudinally drawing: preheating the composite lamination in the advancing direction of the composite lamination, wherein the preheating temperature is 150 ℃ in the process of 120-;

transversely pulling: preheating the longitudinally-drawn composite laminated sheet at the working temperature of 150-180 ℃, gradually reducing the preheating temperature in the advancing direction of the composite laminated sheet, then transversely stretching the preheated composite laminated sheet, wherein the working temperature of a transverse stretching area is 130-170 ℃, shaping the transversely-stretched composite laminated sheet at the working temperature of 150-180 ℃, and cooling the shaped composite laminated sheet to 30-60 ℃ to form the film.

Further, in the extrusion step, the working temperature is 220-300 ℃.

Further, in the cooling step, the extruded laminate of the composition is applied to the surface of the first cooling roll, and immersed in a cooling water bath on the lower side of the first cooling roll as the first cooling roll rotates.

Further, in the cooling step, a cooling medium circulation passage is arranged in the first cooling roller, cooling water circulates in the cooling water tank, the working temperature of the cooling roller is 15-60 ℃, and the working temperature of the cooling water tank is 18-70 ℃.

Further, in the cooling step, an air flow having a pressure is released, the air flow being applied to the back side of the composite laminate initially in contact with the surface of the first cooling roller, and air is forced out between the composite laminate and the first cooling roller, so that the composite laminate is closely adhered to the surface of the first cooling roller.

Further, in the longitudinal drawing process, the composite laminate is preheated by sequentially arranging a plurality of preheating rollers in the advancing direction of the composite laminate, the preheating rollers being circularly heated by hot oil.

Further, during the longitudinal drawing process, the preheated composite laminate is longitudinally drawn by a plurality of drawing rolls in the traveling direction by means of a difference in the rotation speed.

Further, in the cross-draw step, the advancing composite laminate is preheated in a heat exchanger.

Further, the method also comprises a traction winding step, wherein the biaxially oriented film is cooled to below 40 ℃ by a second cooling roller and then wound and wound by a traction device.

Further, in the traction and rolling step, after the film passes through the second cooling roller, the thickness of the film is detected, and the opening height of each flow channel of the die head is adjusted according to detection data, so that the thickness of the film can be adjusted.

Further, in the transverse drawing step, the composite laminated sheet is transversely drawn by clamping the composite laminated sheet on two sides through clamping devices, and in the traction and winding step, after the film passes through a second cooling roller, the film outside the clamping positions of the clamping devices on two sides of the film is cut off.

Further, in the extrusion step, the width of one flow path of the die may be set to be wider than the width of the other flow paths depending on the clamping position of the clamping device.

The invention has the beneficial effects that: the synthetic paper manufactured by the method has the advantages that the first surface has a low static electricity effect, the base paper has good adsorbability to the static electricity protection film, no additional film is required to be coated on the base paper, the flatness is high, and the static electricity protection film is easy to uncover from the first surface.

Drawings

FIG. 1 is a top view of a prior art multiple piece display screen panel package;

FIG. 2 is a cross-sectional view of a co-extruded biaxially oriented synthetic paper having a three-ply laminated composite structure according to an embodiment of the present invention;

FIG. 3 is a cross-sectional view of a coextruded biaxially oriented synthetic paper having a five-layer laminated composite structure according to an embodiment of the present invention;

FIG. 4 is a process flow diagram of a method for manufacturing a co-extruded biaxially oriented synthetic paper according to an embodiment of the present invention;

FIG. 5 is a schematic view of an embodiment of the present invention showing the application of the co-extruded biaxially oriented synthetic paper as a packaging base paper;

fig. 6 and 7 are schematic views of packaging using a coextruded biaxially oriented synthetic paper according to an embodiment of the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to specific embodiments and the accompanying drawings. Those skilled in the art will appreciate that the present invention is not limited to the drawings and the following examples.