Surface skin feeling modification device and method for PP three-layer co-extrusion foaming sheet

Abstract

The invention relates to a surface skin feeling modification device and method for a PP three-layer co-extrusion foaming sheet. Three extruders, a screen exchanger, a metering pump, a distributor, a die head, a calendering roller set, a plurality of guide temperature control rollers, a cooling shaping roller set, a traction roller set and a cutting mechanism are sequentially arranged in the direction of an assembly line. Each roller with the temperature control structure is of a double-flow-channel spiral structure, meanwhile, a heat exchange medium flows from the middle of a flow channel to the two ends or from the middle two ends to the middle of the flow channel, the flowing path of the heat exchange medium is shortened, the temperature difference is improved, and therefore it is guaranteed that the temperature of the rollers can be stably controlled within a preset range, and the service life of the rollers is prolonged. Therefore, the quality of skin-touch texture modification of the upper surface layer of the three-layer PP foamed sheet is improved, and the skin-touch texture is finer and smoother. The formula of the upper surface layer of the three-layer PP foaming sheet is adjusted, and POE (polyolefin elastomer) and TPE (thermoplastic elastomer) are added, so that the upper surface layer is softer and more tough, the skin feeling texture is more uniform, and the effect similar to the human skin touch feeling is formed.

Description

Technical Field

[0001] The present invention relates to the technical field of surface modification of PP foamed sheets, and particularly relates to a device and method for surface skin feel modification of a PP three-layer co-extruded foamed sheet. Background Art

[0002] In the prior art, the heat exchange flow channel of the guiding temperature control roller of the device for producing PP three-layer co-extruded foamed sheets is spiral from one end of the roller to the other end, and the path that the heat exchange medium travels in the flow channel is relatively long, resulting in a temperature difference on the surface of the roller. In addition, water flows inside the heat exchange flow channel, and the temperature stability of water is poor, so it will also cause a temperature difference on the surface of the roller, thereby affecting the stability of the surface skin feel quality of the PP three-layer co-extruded foamed sheet. Summary of the Invention

[0003] The purpose of the present invention is to overcome the deficiencies of the prior art and provide a device and method for surface skin feel modification of a PP three-layer co-extruded foamed sheet.

[0004] To achieve the above purpose, the present invention adopts the following technical solutions: A device for surface skin feel modification of a PP three-layer co-extruded foamed sheet is provided with three extruders, a screen changer, a metering pump, a distributor, a die head, a calender roll group, a plurality of guiding temperature control rollers, a cooling and shaping roll group, a traction roll group, and a cutting mechanism in sequence along the pipeline direction. The calender roll group includes a temperature control intermediate roll, a temperature control pressing roll, and a temperature control adjusting roll located on both sides of the temperature control intermediate roll. The die head is directly above the middle between the temperature control pressing roll and the temperature control intermediate roll. The continuous three-layer PP foamed melt sheet extruded from the die head passes between the temperature control pressing roll and the temperature control intermediate roll and then passes through the temperature control adjusting roll, a plurality of guiding temperature control rollers, the cooling and shaping roll group, the traction roll group, and the cutting mechanism in sequence to form a sheet-shaped three-layer PP foamed sheet. The surface of the roller of the temperature control pressing roll has a skin feel texture. The temperature control structures inside the temperature control pressing roll, the temperature control intermediate roll, the temperature control adjusting roll, and the guiding temperature control rollers are the same. The temperature control structure includes two independent spiral flow channels located inside the barrel wall. The two spiral flow channels are arranged axially staggered along the barrel wall. The two spiral flow channels respectively have intermediate end holes located in the middle of the barrel wall. The two spiral flow channels extend from the intermediate end holes to both ends of the barrel wall respectively, and end holes are respectively provided at the two ends of the two spiral flow channels. The heat exchange medium enters the two spiral flow channels from the intermediate end holes respectively and flows out to the end holes at both ends of the spiral flow channels to achieve heat conduction temperature control, or the heat exchange medium enters the two spiral flow channels from the end holes at both ends respectively and flows out to the intermediate end holes of the spiral flow channels to achieve heat conduction temperature control.

[0005] Further, the heat exchange medium flowing inside the two spiral flow channels is heat-conducting oil.

[0006] Further, a tension control roller and a fixed-length traction mechanism are sequentially arranged at the inlet end of the cutting mechanism along the pipeline direction.

[0007] Furthermore, the temperature control adjusting roller is driven by a hydraulic cylinder to adjust its position.

[0008] A method for modifying the surface skin feeling of a PP three-layer co-extruded foamed sheet, the specific method is as follows: The continuous three-layer pp foamed melt sheet extruded by the die head passes between the temperature control pressing roller and the temperature control intermediate roller. The temperature control pressing roller cooperates with the temperature control intermediate roller to co-extrude the three-layer pp foamed melt sheet. The skin feeling texture on the surface of the temperature control pressing roller co-extrudes on the upper surface layer of the three-layer pp foamed melt sheet to form an artificial skin feeling pattern. The co-extruded three-layer pp foamed melt sheet then sequentially passes through the temperature control adjusting roller, multiple guiding temperature control rollers, a cooling and shaping roller group, a traction roller group, and a cutting mechanism to form a sheet-shaped three-layer pp foamed sheet; wherein, the components of the upper surface layer of the three-layer pp foamed melt sheet include 5w% of POE, 3w% of TPE, and 92w% of PP.

[0009] Adopting the above technical solution, the beneficial effects of the present invention are as follows: 1. All the rollers with temperature control structures involved in the present invention adopt a double-channel spiral structure. At the same time, the heat exchange medium flows from the middle of the flow channel to both ends or from both ends to the middle, shortening the flow path of the heat exchange medium, improving the temperature difference, so as to ensure that the temperature of the roller can be stably controlled within a predetermined range, thereby improving the quality of the modification of the skin feeling pattern on the upper surface layer of the three-layer pp foamed sheet and making the skin feeling pattern more delicate; 2. The heat exchange medium in the double-channel spiral of the temperature control structure adopts a closed-loop circulation of heat-conducting oil for automatic temperature control to further control the temperature stability of the temperature control roller; 3. The surface of the temperature control pressing roller has fine skin feeling texture, which can press out delicate skin feeling texture on the upper surface layer of the three-layer pp foamed sheet; 4. The formula of the upper surface layer of the three-layer pp foamed sheet is adjusted, adding POE (polyolefin elastomer) and TPE (thermoplastic elastomer), making the upper surface layer softer and more flexible, and the skin feeling texture more uniform, forming an effect similar to the touch of human skin. Description of the Drawings

[0010] The following further elaborates on the present invention in detail in conjunction with the drawings and specific embodiments: Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 It is a schematic diagram of the temperature control structure. Specific Embodiments

[0011] As Figure 1-2As shown in the figure, a surface skin-friendly modification device for a three-layer co-extruded PP foamed sheet of the present invention is sequentially provided with three extruders, a screen changer, a metering pump, a distributor, a die head 1, a calender roll group 2, a plurality of guiding temperature control rolls 3, a cooling and shaping roll group 4, a traction roll group 5, and a cutting mechanism 6 along the pipeline direction. The three extruders are used to extrude the materials of the foamed core layer, the upper surface layer, and the lower surface layer respectively. The materials extruded by the three extruders are fed into the distributor after passing through their respective screen changers and metering pumps, and finally extruded by the die head.

[0012] The calender roll group 2 includes a temperature control intermediate roll 21, a temperature control pressing roll 22, and a temperature control adjusting roll 23 located on both sides of the temperature control intermediate roll 21. The temperature control adjusting roll 23 is driven by a hydraulic cylinder to adjust its position. The die head 1 is located directly above the middle between the temperature control pressing roll 22 and the temperature control intermediate roll 21. The continuous three-layer PP foamed melt sheet (foamed core layer and upper and lower surface layers) extruded by the die head 1 passes between the temperature control pressing roll 22 and the temperature control intermediate roll 21 and then sequentially passes through the temperature control adjusting roll 23, a plurality of guiding temperature control rolls 3, a cooling and shaping roll group 4, a traction roll group 5, and a cutting mechanism 6 to form a sheet-shaped three-layer PP foamed sheet. The roller surface of the temperature control pressing roll 22 has fine skin-friendly patterns. The temperature control pressing roll 22, the temperature control intermediate roll 21, the temperature control adjusting roll 23, and the guiding temperature control rolls 3 all have the same temperature control structure inside. The temperature control structure includes two independent spiral channels 7 located inside the cylinder wall. The two spiral channels 7 are arranged staggeredly along the axial direction of the cylinder wall. The two spiral channels 7 respectively have intermediate end holes 71 located in the middle of the cylinder wall. The two spiral channels 7 extend from the intermediate end holes 71 to both ends of the cylinder wall respectively, and end holes 72 are respectively provided at both ends of the two spiral channels 7. The heat exchange medium enters the two spiral channels 7 from the intermediate end holes 71 respectively and flows out to the end holes 72 at both ends of the spiral channels 7 to achieve heat conduction temperature control, or the heat exchange medium enters the two spiral channels 7 from the end holes 72 at both ends respectively and flows out to the intermediate end holes 71 of the spiral channels 7 to achieve heat conduction temperature control.

[0013] The heat exchange medium flowing inside the two spiral channels 7 is heat-conducting oil, and the heat exchange medium adopts a closed-loop circulation automatic temperature control of the heat-conducting oil to further control the temperature stability of the temperature control roll.

[0014] A tension control roll 8 and a fixed-length traction mechanism 9 are sequentially arranged at the inlet end of the cutting mechanism 6 along the pipeline direction to ensure that the cutting mechanism 6 can cut accurately.

[0015] In the present invention, each roller with a temperature control structure adopts a double-channel spiral structure. At the same time, the heat exchange medium flows from the middle of the flow channel to both ends or from both ends to the middle, shortening the flow path of the heat exchange medium and improving the temperature difference, so as to ensure that the temperature of the roller can be stably controlled within a predetermined range, thereby improving the quality of the surface skin texture modification of the three-layer PP foamed sheet and making the skin texture more delicate. The heat exchange medium in the double-channel spiral of the temperature control structure adopts a closed-loop circulation of heat-conducting oil for automatic temperature control to further control the temperature stability of the temperature control roller. The surface of the temperature control roller 22 has fine skin texture lines, which can press out delicate skin texture on the upper surface layer of the three-layer PP foamed sheet.

[0016] The modification method of the present invention is specifically as follows: The continuous three-layer PP foamed melt sheet extruded from the die head 1 passes between the temperature control roller 22 and the temperature control intermediate roller 21. The temperature control roller 22 cooperates with the temperature control intermediate roller 21 to co-extrude the three-layer PP foamed melt sheet. The skin texture lines on the surface of the temperature control roller 22 co-extrude to form an artificial skin texture on the upper surface layer of the three-layer PP foamed melt sheet. The co-extruded three-layer PP foamed melt sheet then sequentially passes through the temperature control adjustment roller 23, multiple guiding temperature control rollers 3, the cooling and shaping roller group 4, the traction roller group 5 and the cutting mechanism 6 to form a sheet-shaped three-layer PP foamed sheet. Among them, the upper surface layer components of the three-layer PP foamed melt sheet include 5w% of POE (polyolefin elastomer), 3w% of TPE (thermoplastic elastomer) and 92w% of pp (polypropylene). The formula of the upper surface layer of the three-layer PP foamed sheet is adjusted by adding POE (polyolefin elastomer) and TPE (thermoplastic elastomer), making the upper surface layer softer and more flexible, and the skin texture more uniform, forming an effect similar to the touch of human skin.

[0017] The specific implementation manners of the present invention have been described above. However, those skilled in the art should understand that this is only an example. Without departing from the principles and essence of the present invention, those skilled in the art can make various changes or modifications to this implementation manner, but these changes and modifications all fall within the protection scope of the present invention.

Claims

1. A PP three-layer co-extruded foam sheet surface skin feel modification device, which is sequentially provided with three extruders, a screen changer, a metering pump, a distributor, a die head, a calendering roller group, a plurality of guide temperature control rollers, a cooling and shaping roller group, a traction roller group and a cutting mechanism along the direction of the production line, wherein the calendering roller group comprises a temperature-controlled intermediate roller and a temperature-controlled pressure roller and a temperature-controlled regulating roller located on both sides of the temperature-controlled intermediate roller, and the die head is located directly above between the temperature-controlled pressure roller and the temperature-controlled intermediate roller, and the die head extrude a continuous three-layer PP foaming melt sheet, passes through the temperature-controlled pressure roller and the temperature-controlled intermediate roller, and then passes through the temperature-controlled regulating roller, a plurality of guide temperature control rollers, a cooling and shaping roller group, a traction roller group and a cutting mechanism to form a sheet-like three-layer PP foam sheet; characterized in that: The roller surface of the temperature control pressure roller has skin-feeling texture; the interiors of the temperature control pressure roller, the temperature control intermediate roller, the temperature control adjustment roller and the guide temperature control roller all have temperature control structures of the same structure, and the temperature control structure includes two spiral flow channels located inside the cylinder wall and independent of each other, the two spiral flow channels are staggered along the axial direction of the cylinder wall, the two spiral flow channels respectively have a middle end hole located in the middle of the cylinder wall, the two spiral flow channels extend from the middle end hole to the two ends of the cylinder wall respectively, and end holes are respectively provided at the two ends of the two spiral flow channels; the heat exchange medium enters the two spiral flow channels from the middle end holes respectively and then flows out to the end end holes at the two ends of the spiral flow channels to achieve thermal conduction temperature control, or the heat exchange medium enters the two spiral flow channels from the end end holes at the two ends respectively and then flows out to the middle end holes of the spiral flow channels to achieve thermal conduction temperature control.

2. The device for modifying the surface skin feel of a PP three-layer co-extruded foam sheet according to claim 1, characterized in that: The heat exchange medium circulating inside the two spiral flow channels is heat transfer oil.

3. The device for modifying the surface skin feel of a PP three-layer co-extruded foamed sheet according to claim 1, characterized in that: The inlet end of the cutting mechanism is provided with a tension control roller and a fixed-length traction mechanism in sequence along the assembly line direction.

4. The device for modifying the surface skin feel of a PP three-layer co-extruded foamed sheet according to claim 1, characterized in that: The temperature control roller is driven by a hydraulic cylinder to adjust the position.

5. The modification method of the PP three-layer co-extruded foam sheet surface skin feel modification device according to any one of claims 1 to 4, characterized in that: The die head extrude a continuous three-layer pp foamed soluble sheet through the temperature-controlled pressure roller and the temperature-controlled middle roller. The temperature-controlled pressure roller cooperates with the temperature-controlled middle roller to co-extrude the three-layer pp foamed soluble sheet. The skin-feel texture on the surface of the temperature-controlled pressure roller is co-extruded on the upper surface of the three-layer pp foamed soluble sheet to form human-like skin texture. The co-extruded three-layer pp foamed soluble sheet then passes through a temperature-controlled regulating roller, a plurality of guide temperature-controlled rollers, a cooling and shaping roller group, a traction roller group and a cutting mechanism in sequence to form a sheet-like three-layer pp foamed sheet; wherein, the upper surface layer components of the three-layer pp foamed soluble sheet include 5w% POE, 3w% TPE and 92w% PP.

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