A tpu film extrusion head

Abstract

The utility model relates to the field of TPU film extrusion molding, specifically discloses a TPU film extrusion head, extrusion mould is used for TPU film extrusion molding, and the extrusion mould includes the mould of upper and lower symmetry, and the flow channel for the film raw material in the molten state is formed between two moulds and passes, side plate is provided with two and is fixed in the left and right sides of extrusion mould respectively, and the side plate is used for blocking the left and right sides opening of flow channel, heat dissipation subassembly is provided with two and is fixed in the upper and lower sides of extrusion mould respectively, and the heat dissipation subassembly includes the casing and heat dissipation structure, and the left and right side edges of casing respectively with the side plate of left and right sides abut, the utility model discloses through multiple heat dissipation fins in heat dissipation structure and the abutment of mould surface, first air inlet pipe blows the airflow to heat dissipation fin, to accelerate the heat transfer of extrusion head film forming position place, thus accelerates the film cooling solidification, to make the extrusion head guarantee higher extrusion speed while ensuring the film forming quality, thereby improve the film extrusion molding efficiency.

Description

Technical Field

[0001] This utility model relates to the field of TPU film extrusion molding, specifically a TPU film extrusion head. Background Technology

[0002] TPU film extrusion molding is a process in which TPU granules are heated and melted in an extruder, sheared and plasticized by a screw, and then formed into a sheet-like melt through the flow channel of the extruder head. After cooling, shaping, traction, and winding, a continuous film is formed. However, traditional extruder heads do not have heat dissipation capabilities, meaning that the film needs to cool naturally during extrusion molding. This leads to the need for strict control of the film extrusion speed. If the extrusion speed is too fast, the film has not yet completely solidified, and the friction between the film and the flow channel wall of the extruder head during extrusion can easily cause damage to the film after extrusion, affecting the quality of the film molding. Therefore, it is necessary to slow down the film extrusion speed, which in turn affects the efficiency of film extrusion molding. Utility Model Content

[0003] The purpose of this invention is to provide a TPU film extrusion head to overcome the above-mentioned defects in the prior art.

[0004] A TPU film extrusion head according to the present invention includes:

[0005] An extrusion die for extruding TPU film, the extrusion die comprising upper and lower symmetrically arranged molds, with a flow channel formed between the upper and lower molds for the molten film material to pass through;

[0006] Two side plates are provided and fixed to the left and right sides of the extrusion die, respectively. The side plates are used to block the openings on the left and right sides of the flow channel.

[0007] The heat dissipation assembly has two parts, which are respectively fixed on the upper and lower sides of the extrusion die. The heat dissipation assembly includes a shell and a heat dissipation structure. The left and right edges of the shell abut against the left and right side plates respectively. A heat dissipation cavity is formed between the shell and the die surface. The heat dissipation structure includes a heat dissipation plate and a plurality of equidistantly distributed heat dissipation fins. The heat dissipation fins are fixed on the heat dissipation plate. The heat dissipation plate abuts against the upper side wall of the shell. The lower edge of the heat dissipation fins abuts against the die surface.

[0008] The rear cover plate is fixed to the rear end of the extrusion die and is used to block the rear end of the flow channel.

[0009] Preferably, the heat dissipation assembly further includes a first air inlet pipe, which is fixed to the housing and one end is connected to the heat dissipation cavity. The other end of the first air inlet pipe is connected to an air pump. A heat dissipation channel is formed between the adjacent heat dissipation fins. The front end of the housing is provided with a plurality of through slots corresponding to the heat dissipation channels. The airflow discharged from the first air inlet pipe enters the heat dissipation cavity and the heat dissipation channel and is discharged through the through slots.

[0010] Preferably, the front end of the mold has an installation groove, a pressure roller is rotatably connected in the installation groove, and a pad layer fixed in the installation groove is provided on the rear side of the pressure roller.

[0011] Preferably, the pressure roller is hollow inside, and a vent pipe communicating with the internal cavity is fixed at both ends of the pressure roller. A cover is fixed on the side plate, and the vent pipe passes through the side plate and communicates with the cover. A second air inlet pipe communicating with the vent pipe is fixed on the cover, and one of the second air inlet pipes is connected to an air pump.

[0012] Preferably, the mold surface is fixed with a heat insulation layer located inside the heat dissipation cavity.

[0013] Preferably, a connecting pipe communicating with the flow channel is fixed on the rear cover plate.

[0014] The beneficial effects of this utility model are: the multiple heat dissipation fins in the heat dissipation structure abut against the mold surface, and the first air inlet pipe blows airflow toward the heat dissipation fins, thereby accelerating the heat transfer at the film forming position of the extrusion head, thus accelerating the cooling and solidification of the film, thereby ensuring the film forming quality while maintaining a high extrusion speed, thereby improving the film extrusion forming efficiency. Attached Figure Description

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

[0016] Figure 2 This is a utility model Figure 1 A sectional view;

[0017] Figure 3 This is a utility model Figure 2 Enlarged diagram of point A in the diagram;

[0018] Figure 4 This is a schematic diagram of the airflow direction in this utility model;

[0019] Figure 5 This is an exploded view of this utility model;

[0020] Figure 6 This is a utility model Figure 5 Enlarged diagram of point B in the image.

[0021] In the picture:

[0022] 10. Mold; 11. Pressure roller; 12. Flow channel; 13. Pad layer; 14. Fastener; 15. Vent pipe; 16. Mounting groove; 20. Rear cover plate; 21. Connecting pipe; 30. Side plate; 31. Cover body; 32. Second air inlet pipe; 33. Through hole; 40. Shell; 41. First air inlet pipe; 42. Through groove; 43. Heat dissipation cavity; 50. Heat dissipation fins; 52. Heat dissipation plate; 51. Heat dissipation channel; 60. Insulation layer. Detailed Implementation

[0023] In the description of this utility model, it should be understood that the terms "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the appendix. Figure 1 The orientations or positional relationships shown are merely simplified descriptions for the convenience of describing this utility model, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0024] To make the objectives and advantages of this utility model clearer, the following detailed description is provided in conjunction with embodiments. It should be understood that the following text is merely used to describe one or more specific embodiments of this utility model and does not strictly limit the scope of protection specifically claimed by this utility model. As used herein, the terms up and down and left and right are not limited to their strict geometric definitions, but include tolerances for reasonable and inconsistent machining or human errors. The specific features of this TPU film extrusion head are described in detail below:

[0025] One embodiment of this utility model:

[0026] Reference Figures 1-6 This utility model provides a TPU film extrusion head, including an extrusion die, a rear cover plate 20, a side plate 30, and a heat dissipation structure. The extrusion die is used for TPU film extrusion molding. The extrusion die includes a mold 10 arranged symmetrically on the upper and lower sides. A flow channel 12 is formed between the upper and lower molds 10 for the molten film material to pass through. The mold 10 is inclined from back to front towards the flow channel 12, so that the flow channel 12 gradually narrows from back to front into a constricted shape. Side plates 30 are fixed on the left and right sides of the extrusion die, and the side plates 30 are used to block the openings on the left and right sides of the flow channel 12.

[0027] The heat dissipation assembly has two parts, which are fixed to the upper and lower sides of the extrusion die respectively. The heat dissipation assembly includes a housing 40 and a heat dissipation structure. The left and right sides of the housing 40 abut against the left and right side plates 30 respectively. The left and right sides of the housing 40 are fixed to the side plates 30 by bolts. A heat dissipation cavity 43 is formed between the housing 40 and the surface of the mold 10. The heat dissipation structure includes a heat dissipation plate 52 and multiple equidistant heat dissipation fins 50. The heat dissipation fins 50 are fixed on the heat dissipation plate 52. The heat dissipation plate 52 abuts against the upper side wall of the housing 40. The lower edge of the heat dissipation fins 50 abuts against the surface of the mold 10.

[0028] The rear cover plate 20 is fixed to the rear end of the extrusion die and is used to block the rear end of the flow channel 12.

[0029] The heat dissipation assembly also includes a first air inlet pipe 41, which is fixed to the housing 40 and one end is connected to the heat dissipation cavity 43. The other end of the first air inlet pipe 41 is connected to an air pump. A heat dissipation channel 51 is formed between adjacent heat dissipation fins 50. A plurality of through slots 42 corresponding to the heat dissipation channel 51 are opened at the front end of the housing 40. The airflow discharged from the first air inlet pipe 41 enters the heat dissipation cavity 43 and the heat dissipation channel 51 and is discharged through the through slots 42.

[0030] The mold 10 has an installation groove 16 at its front end, and a pressure roller 11 is rotatably connected inside the installation groove 16. A pad 13, made of rubber, is fixed to the rear side of the pressure roller 11 within the installation groove 16. The lower end face of the upper pad 13 is flush with the lower end face of the upper mold 10, and the upper end face of the lower pad 13 is flush with the upper end face of the lower mold 10. The outer periphery of the upper pressure roller 11 is tangent to the lower end face of the upper pad 13, and the outer periphery of the lower pressure roller 11 is tangent to the upper end face of the lower pad 13. The pressure roller 11 is hollow inside, and both ends of the pressure roller 11 are fixed with pads inside. A vent pipe 15 is connected to the cavity and passes through the left and right side walls of the mounting groove 16. The front end of the mold 10 is fixed with a fastener 14 by bolts. The vent pipe 15 is rotatably connected between the fastener 14 and the front end of the mold 10. A cover 31 is fixed on the side plate 30. A through hole 33 corresponding to the vent pipe 15 is opened on the side plate 30. The vent pipe 15 passes through the through hole 33 on the side plate 30 and is connected to the cover 31. A second air inlet pipe 32 connected to the vent pipe 15 is fixed on the cover 31. One of the second air inlet pipes 32 is connected to an air pump.

[0031] A heat insulation layer 60 is fixed on the surface of the mold 10 and located in the heat dissipation cavity 43. The heat insulation layer 60 is made of high temperature resistant rubber.

[0032] A connecting pipe 21 that communicates with the flow channel 12 is fixed on the rear cover plate 20.

[0033] In use, the connecting pipe 21 is connected to the extruder. After the raw material is sheared and melted by the screw of the extruder, it is squeezed into the flow channel 12 through the connecting pipe 21 and finally extruded from the front end of the flow channel 12 to form a film.

[0034] During the film extrusion process, the air pump supplies air into the first air inlet pipe 41 and the second air inlet pipe 32. The airflow passes through the heat dissipation channel 51, which accelerates the heat transfer of the heat dissipation fins 50, thereby accelerating the cooling speed of the front end of the mold 10. This increases the cooling speed of the molten material as it passes through the front end of the flow channel 12, thereby accelerating the film forming speed and improving the film extrusion forming efficiency.

[0035] When the airflow passes through the pressure roller 11, it can keep the pressure roller 11 in a cooled state. Through the rolling extrusion of the pressure roller 11, the film forming speed can be further accelerated, thereby further improving the film extrusion forming efficiency.

[0036] Those skilled in the art will appreciate that various modifications to the above embodiments can be made without departing from the overall spirit and concept of this utility model. All such modifications fall within the protection scope of this utility model. The protection scheme of this utility model is defined by the appended claims.

Claims

1. A TPU film extruder, characterized in that, include: An extrusion die for extruding TPU film, the extrusion die comprising upper and lower symmetrically arranged molds (10), with a flow channel (12) formed between the upper and lower molds (10) for the molten film material to pass through. Two side plates (30) are provided and fixed to the left and right sides of the extrusion die respectively. The side plates (30) are used to block the openings on the left and right sides of the flow channel (12). The heat dissipation assembly has two parts, which are respectively fixed on the upper and lower sides of the extrusion mold. The heat dissipation assembly includes a housing (40) and a heat dissipation structure. The left and right edges of the housing (40) abut against the left and right side plates (30) respectively. A heat dissipation cavity (43) is formed between the housing (40) and the surface of the mold (10). The heat dissipation structure includes a heat dissipation plate (52) and a plurality of equidistant heat dissipation fins (50). The heat dissipation fins (50) are fixed on the heat dissipation plate (52). The heat dissipation plate (52) abuts against the upper side wall of the housing (40). The lower edge of the heat dissipation fins (50) abuts against the surface of the mold (10). The rear cover plate (20) is fixed to the rear end of the extrusion die and is used to block the rear end of the flow channel (12).

2. The TPU film extrusion head according to claim 1, characterized in that, The heat dissipation assembly also includes a first air inlet pipe (41), which is fixed on the housing (40) and one end is connected to the heat dissipation cavity (43). The other end of the first air inlet pipe (41) is connected to an air pump. A heat dissipation channel (51) is formed between adjacent heat dissipation fins (50). The front end of the housing (40) is provided with a plurality of through slots (42) corresponding to the heat dissipation channel (51). The airflow discharged from the first air inlet pipe (41) enters the heat dissipation cavity (43) and the heat dissipation channel (51) and is discharged through the through slots (42).

3. The TPU film extrusion head according to claim 1, characterized in that, The mold (10) has an installation groove (16) at the front end, and a pressure roller (11) is rotatably connected in the installation groove (16). A pad (13) is fixed in the installation groove (16) on the rear side of the pressure roller (11).

4. A TPU film extrusion head according to claim 3, characterized in that, The pressure roller (11) is hollow inside. Both ends of the pressure roller (11) are fixed with vent pipes (15) that communicate with the internal cavity. A cover (31) is fixed on the side plate (30). The vent pipe (15) passes through the side plate (30) and communicates with the cover (31). A second air inlet pipe (32) that communicates with the vent pipe (15) is fixed on the cover (31). One of the second air inlet pipes (32) is connected to an air pump.

5. A TPU film extrusion head according to claim 1, characterized in that, The mold (10) has a heat insulation layer (60) fixed on its surface, which is located in the heat dissipation cavity (43).

6. A TPU film extruder according to claim 1, characterized in that, The rear cover plate (20) is fixed with a connecting pipe (21) that communicates with the flow channel (12).

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