Surface skin modification device for pp three-layer co-extruded foamed sheet

Abstract

The utility model relates to a kind of PP three-layer co-extrusion foamed sheet surface skin feeling modification devices, and three extruders, screen changer, metering pump, distributor, die, calendar roll group, multiple guide temperature control roller, cooling setting roller group, traction roller group and cutting mechanism are sequentially provided along assembly line direction.The roller barrel of each temperature control structure involved in the utility model is all adopted double-runner spiral structure, and heat exchange medium flows from the middle to both ends of runner or middle two ends to middle, shortens the flow path of heat exchange medium, improves temperature difference, so as to ensure that the temperature of roller barrel can be stably controlled in predetermined range, so as to improve the quality of skin feeling texture modification on three-layer pp foamed sheet upper layer, so that skin feeling texture is more delicate.

Description

Technical Field

[0001] This utility model relates to the field of PP foam sheet surface modification technology, specifically to a device for modifying the skin feel of PP three-layer co-extruded foam sheet surface. Background Technology

[0002] In the prior art, the heat exchange channel of the guide temperature control roller in the PP three-layer co-extruded foam sheet production device is spiral from one end of the roller to the other. The heat exchange medium travels a long path in the channel, resulting in a temperature difference on the roller surface. In addition, the water flowing inside the heat exchange channel has poor temperature stability, which also leads to a temperature difference on the roller surface, thus affecting the stability of the skin feel quality of the PP three-layer co-extruded foam sheet surface. Summary of the Invention

[0003] The purpose of this invention is to overcome the shortcomings of the prior art and provide a device for modifying the surface feel of PP three-layer co-extruded foamed sheets.

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] A surface skin-feel modification device for PP three-layer co-extruded foam sheets includes three extruders, a screen changer, a metering pump, a distributor, a die, a calendering roll assembly, multiple guide temperature-controlled rolls, a cooling and shaping roll assembly, a traction roll assembly, and a cutting mechanism arranged sequentially along the production line. The calendering roll assembly includes a temperature-controlled intermediate roll and temperature-controlled pressure rolls and temperature-controlled adjusting rolls located on either side of the intermediate roll. The die is positioned directly above the temperature-controlled pressure roll and the intermediate roll. The die extrudes a continuous three-layer PP foam sheet, which passes between the temperature-controlled pressure roll and the intermediate roll, and then sequentially passes through the temperature-controlled adjusting roll, multiple guide temperature-controlled rolls, the cooling and shaping roll assembly, the traction roll assembly, and the cutting mechanism to form a sheet-like three-layer PP foam sheet. The surface of the temperature-controlled pressure roll has a skin-feel texture. The temperature-controlled pressure roller, temperature-controlled intermediate roller, temperature-controlled adjusting roller, and guide temperature-controlled roller all have the same internal temperature control structure. The temperature control structure includes two independent spiral channels located inside the cylinder wall. The two spiral channels are staggered along the axial direction of the cylinder wall. Each spiral channel has a middle end hole located in the middle of the cylinder wall. The two spiral channels extend from the middle end holes to both ends of the cylinder wall, and each end of the two spiral channels has an end hole. The heat exchange medium enters the two spiral channels from the middle end holes and flows out to the end holes at both ends of the spiral channels to achieve heat conduction and temperature control, or the heat exchange medium enters the two spiral channels from the end holes at both ends and flows out to the middle end holes of the spiral channels to achieve heat conduction and temperature control.

[0006] Furthermore, the heat exchange medium flowing inside the two spiral channels is heat transfer oil.

[0007] Furthermore, the inlet end of the cutting mechanism is provided with a tension control roller and a fixed-length traction mechanism in sequence along the production line direction.

[0008] Furthermore, the temperature control roller is adjusted in position by a hydraulic cylinder.

[0009] By adopting the above technical solution, the beneficial effects of this utility model are as follows:

[0010] 1. All rollers with temperature control structures involved in this utility model adopt a double-channel spiral structure. At the same time, the heat exchange medium flows from the middle to both ends of the channel or from both ends to the middle, which shortens the flow path of the heat exchange medium and improves the temperature difference. This ensures that the temperature of the roller can be stably controlled within the predetermined range, thereby improving the quality of the skin-feel texture modification on the upper surface of the three-layer PP foam sheet and making the skin-feel texture more delicate.

[0011] 2. The heat exchange medium in the dual-channel spiral of the temperature control structure adopts closed-loop circulation of heat transfer oil for automatic temperature control, further controlling the temperature stability of the temperature control roller;

[0012] 3. The surface of the temperature-controlled pressure roller has a fine skin-feel texture, which can press a delicate skin-feel texture onto the surface of the three-layer PP foam sheet;

[0013] 4. The formula of the upper layer of the three-layer PP foam sheet is adjusted by adding POE (polyolefin elastomer) and TPE (thermoplastic elastomer), making the upper layer softer and more resilient, with a more uniform skin-like texture, forming a similar effect to the touch of human skin. Attached Figure Description

[0014] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments:

[0015] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0016] Figure 2 This is a schematic diagram of the temperature control structure. Detailed Implementation

[0017] like Figure 1-2 As shown, this utility model discloses a surface skin-feel modification device for PP three-layer co-extruded foamed sheets. Along the production line direction, it is sequentially equipped with three extruders, a screen changer, a metering pump, a distributor, a die head 1, a calendering roller group 2, multiple guide temperature-controlled rollers 3, a cooling and shaping roller group 4, a traction roller group 5, and a cutting mechanism 6. The three extruders are used to extrude materials for the foamed core layer, upper surface layer, and lower surface layer, respectively. The materials extruded by the three extruders pass through their respective screen changers and metering pumps before converging into the distributor, and are finally extruded through the die head.

[0018] The calendering roll assembly 2 includes a temperature-controlled intermediate roll 21 and temperature-controlled pressure rolls 22 and temperature-controlled adjusting rolls 23 located on both sides of the temperature-controlled intermediate roll 21. The temperature-controlled adjusting roll 23 is driven by a hydraulic cylinder to adjust its position. The die head 1 is located directly above the temperature-controlled pressure roll 22 and the temperature-controlled intermediate roll 21. The die head 1 extrudes a continuous three-layer PP foam sheet (foamed core layer and upper and lower surface layers). After passing between the temperature-controlled pressure roll 22 and the temperature-controlled intermediate roll 21, the sheet sequentially passes through the temperature-controlled adjusting roll 23, multiple guide temperature-controlled rolls 3, cooling and shaping roll assembly 4, traction roll assembly 5, and cutting mechanism 6 to form a sheet-like three-layer PP foam sheet. The surface of the temperature-controlled pressure roll 22 has a fine, skin-like texture. The temperature-controlled pressure roller 22, temperature-controlled intermediate roller 21, temperature-controlled adjusting roller 23, and guide temperature-controlled roller 3 all have the same internal temperature control structure. The temperature control structure includes two independent spiral flow channels 7 located inside the cylinder wall. The two spiral flow channels 7 are staggered along the axial direction of the cylinder wall. Each of the two spiral flow channels 7 has a middle end hole 71 located in the middle of the cylinder wall. The two spiral flow channels 7 extend from the middle end hole 71 to both ends of the cylinder wall, and each end of the two spiral flow channels 7 has an end hole 72. The heat exchange medium enters the two spiral flow channels 7 from the middle end hole 71 and flows out to the end holes 72 at both ends of the spiral flow channels 7 to achieve heat conduction and temperature control, or the heat exchange medium enters the two spiral flow channels 7 from the end holes 72 at both ends and flows out to the middle end hole 71 of the spiral flow channels 7 to achieve heat conduction and temperature control.

[0019] The heat exchange medium flowing inside the two spiral flow channels 7 is heat transfer oil. The heat exchange medium adopts closed-loop circulation and automatic temperature control of heat transfer oil to further control the temperature stability of the temperature control roller.

[0020] The inlet end of the cutting mechanism 6 is provided with a tension control roller 8 and a fixed-length traction mechanism 9 in sequence along the production line direction to ensure that the cutting mechanism 6 can cut accurately.

[0021] The rollers with temperature control structures involved in this utility model all adopt a double-channel spiral structure. At the same time, the heat exchange medium flows from the middle to both ends of the channel or from both ends to the middle, which shortens the flow path of the heat exchange medium and improves the temperature difference. This ensures that the temperature of the roller can be stably controlled within a predetermined range, thereby improving the quality of the skin-feel texture modification on the surface of the three-layer PP foam sheet and making the skin-feel texture more delicate. The heat exchange medium in the double-channel spiral of the temperature control structure adopts a closed-loop circulation of heat transfer oil for automatic temperature control, further controlling the temperature stability of the temperature control roller. The surface of the temperature control roller 22 has a fine skin-feel texture, which can press a delicate skin-feel texture on the surface of the three-layer PP foam sheet.

[0022] The modification method of this utility model is as follows: The die head 1 extrudes a continuous three-layer PP foam sheet between the temperature-controlled pressure roller 22 and the temperature-controlled intermediate roller 21. The temperature-controlled pressure roller 22 and the temperature-controlled intermediate roller 21 co-extrude the three-layer PP foam sheet. The skin-like texture on the surface of the temperature-controlled pressure roller 22 is co-extruded on the upper surface of the three-layer PP foam sheet to form a human skin-like texture. After co-extrusion, the three-layer PP foam sheet passes in sequence through the temperature-controlled regulating roller 23, multiple guide temperature-controlled rollers 3, cooling and shaping roller group 4, traction roller group 5 and cutting mechanism 6 to form a sheet-like three-layer PP foam sheet.

[0023] The top layer of the three-layer PP foam sheet comprises 5 wt% POE (polyolefin elastomer), 3 wt% TPE (thermoplastic elastomer), and 92 wt% PP (polypropylene). The formulation of the top layer of the three-layer PP foam sheet has been adjusted by adding POE and TPE, making the top layer softer and more resilient, with a more uniform skin-like texture, creating a feel similar to human skin.

[0024] The specific embodiments of this utility model have been described above. However, those skilled in the art should understand that this is only an example. Those skilled in the art can make various changes or modifications to this embodiment without departing from the principle and essence of this utility model, but all such changes and modifications fall within the protection scope of this utility model.

Claims

1. A surface skin-feel modification device for PP three-layer co-extruded foamed sheets, comprising three extruders, a screen changer, a metering pump, a distributor, a die head, a calendering roll group, multiple guide temperature-controlled rolls, a cooling and shaping roll group, a traction roll group, and a cutting mechanism arranged sequentially along the production line direction. The calendering roll group includes a temperature-controlled intermediate roll and temperature-controlled pressure rolls and temperature-controlled adjusting rolls located on both sides of the temperature-controlled intermediate roll. The die head is located directly above the temperature-controlled pressure roll and the temperature-controlled intermediate roll. The die head extrudes a continuous three-layer PP foamed sheet, which passes between the temperature-controlled pressure roll and the temperature-controlled intermediate roll, and then sequentially passes through the temperature-controlled adjusting roll, multiple guide temperature-controlled rolls, the cooling and shaping roll group, the traction roll group, and the cutting mechanism to form a sheet-like three-layer PP foamed sheet; characterized in that: The surface of the temperature-controlled pressure roller has a skin-feel texture. The temperature-controlled pressure roller, temperature-controlled intermediate roller, temperature-controlled adjusting roller, and guide temperature-controlled roller all have the same internal temperature control structure. The temperature control structure includes two independent spiral channels located inside the cylinder wall. The two spiral channels are staggered along the axial direction of the cylinder wall. Each spiral channel has a middle end hole located in the middle of the cylinder wall. The two spiral channels extend from the middle end holes to both ends of the cylinder wall, and each end of the two spiral channels has an end hole. The heat exchange medium enters the two spiral channels from the middle end holes and flows out to the end holes at both ends of the spiral channels to achieve heat conduction and temperature control, or the heat exchange medium enters the two spiral channels from the end holes at both ends and flows out to the middle end holes of the spiral channels to achieve heat conduction and temperature control.

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

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

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

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