Plastic extrusion die

Abstract

The utility model discloses a plastic extrusion die, which relates to the field of plastic extrusion molding equipment, and comprises a first die body and a second die body which are matched with each other, and an extrusion runner is arranged between the first die body and the second die body; the side wall, close to the outlet end of the extrusion runner, of the second die body comprises a runner wall and a mounting wall. A connecting bolt is arranged between the runner wall and the mounting wall; and the heating element is arranged in the center of the connecting bolt, so that during use, the connecting bolt is heated through the heating element so as to transfer the temperature into the runner wall, and molten plastic can be effectively prevented from condensing on the end face of the outlet end of the extrusion runner. Meanwhile, the connecting bolt expands after being heated, so that the runner wall slightly deforms towards one side of the extrusion runner, the extrusion runner is extruded, the outlet end of the extrusion runner is narrowed, the pressure and the flow speed of the molten plastic in the extrusion runner are increased, and the molten plastic can be further prevented from flowing out towards the two sides of the end face of the outlet end of the extrusion runner.

Description

Technical Field

[0001] The utility model belongs to the field of plastic extrusion molding equipment, and particularly relates to a plastic extrusion die. Background Art

[0002] Plastic products are made from a mixture of synthetic resin and various additives by methods such as injection, extrusion, pressing, and casting.

[0003] Extrusion molding is a common method for plastic product molding. High-temperature molten plastics and other materials are injected into an extrusion die through an injection molding machine, and then the plastics are extruded in the form of sheets or cylinders through the extrusion die. After extrusion, the molten plastics leave the high-temperature environment and quickly solidify in the air to form plastic products.

[0004] Almost all the extrusion channels of existing plastic extrusion molding dies are straight channels.

[0005] The straight channel has the following obvious defects:

[0006] (1) After the molten plastics are extruded, it is easy to form solidified particles or blocks when encountering the cold end face of the extrusion channel, that is, the phenomenon of material hanging.

[0007] (2) At the position of the extrusion channel that is farther away from the center of the extrusion die, the temperature of the extrusion die decreases, resulting in a lower temperature of the molten plastics. The plastic particles or blocks condensed at the extrusion outlet are likely to fall into the extrusion channel, and the temperature of the molten plastics at the extrusion outlet is not high enough to immediately melt the fallen plastic particles or blocks. These plastic particles or blocks will be carried into the molten plastics. The molten plastics containing plastic particles or blocks will have obvious defects such as uneven texture and particles or blocks after cooling. Content of the Utility Model

[0008] In order to solve the above problems existing in the prior art, the purpose of the utility model is to provide a plastic extrusion die.

[0009] The technical solution adopted by the utility model is as follows:

[0010] A plastic extrusion die, the extrusion die includes a first die body and a second die body that fit together, and an extrusion channel is formed between the first die body and the second die body; the side wall of the second die body near the outlet end of the extrusion channel includes a channel wall and a mounting wall, and a connecting bolt is arranged between the channel wall and the mounting wall; a heating element is arranged at the center of the connecting bolt.

[0011] Optionally, a placement groove penetrating the nut is formed at the center of the connecting bolt, and one end of the placement groove is located inside the channel wall; one end of the heating element is placed in the placement groove, and the other end is connected to a power source.

[0012] Optionally, the heating element is an electric heating rod.

[0013] Optionally, a plurality of connecting bolts are equidistantly arranged between the runner wall and the mounting wall.

[0014] Optionally, the nuts of the connecting bolts are internal hexagons or external hexagons.

[0015] Optionally, the runner wall and the mounting wall can move relative to each other.

[0016] The beneficial effects of the present utility model are as follows:

[0017] The present utility model provides a plastic extrusion die, which comprises a first die body and a second die body that fit together, and an extrusion runner is provided between the first die body and the second die body; the side wall of the second die body near the outlet end of the extrusion runner comprises a runner wall and a mounting wall. In the present utility model, connecting bolts are arranged between the runner wall and the mounting wall; a heating element is arranged at the center of the connecting bolts. During use, the connecting bolts are heated by the heating element, and then the temperature is transmitted into the runner wall, so as to increase the temperature at the outlet end of the extrusion runner, avoiding the situation that the temperature of the extrusion die decreases at the position farther away from the center of the extrusion die in the extrusion runner, and effectively preventing the molten plastic from condensing on the end face of the outlet of the extrusion runner. At the same time, after the connecting bolts are heated, they expand and become longer, so that the runner wall and the mounting wall move away from each other, and then the runner wall generates a slight deformation toward the side of the extrusion runner, squeezing the extrusion runner to make the outlet end of the extrusion runner narrower. When other parameters remain unchanged, the pressure and flow rate of the molten plastic in the extrusion runner will increase, and it can also avoid the molten plastic flowing out to both sides of the end face of the outlet of the extrusion runner due to insufficient flow rate or pressure. Description of the Drawings

[0018] Figure 1 is a cross-sectional schematic diagram of the present utility model.

[0019] Figure 2 is an enlarged schematic diagram of the extrusion outlet end of the extrusion runner.

[0020] Figure 3 is an enlarged schematic diagram of the section between the second wedge surface of the extrusion runner and the first buffer cavity.

[0021] In the figure: 1 - first die body, 2 - second die body, 3 - extrusion runner, 4 - runner wall, 5 - mounting wall, 6 - connecting bolt, 7 - heating element. Detailed Embodiment

[0022] In this embodiment, as Figures 1 to 3A plastic extrusion die as shown, which includes a first die body 1 and a second die body 2 that fit together. An extrusion channel 3 is provided between the first die body 1 and the second die body 2; the side wall of the second die body 2 near the outlet end of the extrusion channel 3 includes a flow channel wall 4 and a mounting wall 5, and a connecting bolt 6 is provided between the flow channel wall 4 and the mounting wall 5; a heating element 7 is provided at the center of the connecting bolt 6. In the utility model, a connecting bolt 6 is provided between the flow channel wall 4 and the mounting wall 5; a heating element 7 is provided at the center of the connecting bolt 6. During use, the connecting bolt 6 is heated by the heating element 7, and then the temperature is transmitted into the flow channel wall 4, so as to increase the temperature at the outlet end of the extrusion channel 3, avoiding the situation that the temperature of the extrusion channel 3 decreases at the position farther away from the center of the extrusion die, and effectively preventing the molten plastic from condensing on the end face of the outlet of the extrusion channel 3. At the same time, after the connecting bolt 6 is heated, it expands and the connecting bolt 6 becomes longer, which will cause the flow channel wall 4 and the mounting wall 5 to move away from each other, and then cause the flow channel wall 4 to produce a slight deformation toward the side of the extrusion channel 3, squeezing the extrusion channel 3 to make the outlet end of the extrusion channel 3 narrower. Under the condition that other parameters remain unchanged, it will increase the pressure and flow rate of the molten plastic in the extrusion channel 3, and can also avoid the molten plastic flowing out to both sides of the end face of the outlet of the extrusion channel 3 due to insufficient flow rate or pressure.

[0023] In this embodiment, as Figure 2 and Figure 3 shown, a placement groove penetrating the nut is provided at the center of the connecting bolt 6, and one end of the placement groove is located within the flow channel wall 4; one end of the heating element 7 is placed in the placement groove, and the other end is connected to a power source.

[0024] The heating element 7 can be an electric heating tube, an electric heating rod or an electric heating coil. In this embodiment, the heating element 7 is an electric heating rod.

[0025] In some other embodiments, the heating element 7 is selected as an electric heating coil, and the electric heating coil can be wound around the nut part of the connecting bolt 6. When there is a large gap between the flow channel wall 4 and the mounting wall 5, it can also be wound around the part of the connecting bolt 6 in the gap between the flow channel wall 4 and the mounting wall 5.

[0026] In this embodiment, a plurality of connecting bolts 6 are arranged at equal intervals between the flow channel wall 4 and the mounting wall 5, and the spacing and quantity between the connecting bolts 6 are determined according to the lengths of the first die body 1 and the second die body 2.

[0027] In this embodiment, the nut of the connecting bolt 6 is an internal hexagon or an external hexagon.

[0028] In this embodiment, as Figure 1As shown, the runner wall 4 and the mounting wall 5 can move relative to each other. The runner wall 4 is placed at the top of the second mold body 2 and is only connected to the mounting wall 5 by a plurality of connecting bolts 6, which can make the length change caused by the thermal expansion and contraction of the connecting bolts 6 more obvious for the change of the extrusion runner 3.

[0029] In some other embodiments, the runner wall 4 is immovable, and the deformation of the runner wall 4 is caused only by the deformation of a plurality of connecting bolts 6.

[0030] In the present utility model, unless otherwise clearly defined and limited, terms such as "mounting", "connecting", "connection", "fixing", etc. shall be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0031] In the description of this specification, the description with reference to terms such as "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present utility model. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0032] Although the embodiments of the present utility model have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present utility model. Those of ordinary skill in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of the present utility model.

Claims

1. A plastic extrusion die, characterized in that: The extrusion die includes a first die body (1) and a second die body (2) that fit together, and an extrusion channel (3) is provided between the first die body (1) and the second die body (2); The side wall of the second die body (2) near the outlet end of the extrusion channel (3) includes a channel wall (4) and a mounting wall (5), and a connecting bolt (6) is provided between the channel wall (4) and the mounting wall (5); A heating element (7) is provided at the center of the connecting bolt (6).

2. The plastic extrusion die according to claim 1, wherein, A placement groove penetrating the nut is provided at the center of the connecting bolt (6), and one end of the placement groove is located within the channel wall (4); One end of the heating element (7) is placed in the placement groove, and the other end is connected to a power source.

3. A plastic extrusion die according to claim 1, characterized in that, The heating element (7) is an electric heating rod.

4. A plastic extrusion die according to claim 1, wherein, A plurality of connecting bolts (6) are equidistantly arranged between the channel wall (4) and the mounting wall (5).

5. A plastic extrusion die according to claim 1, characterized in that, The nut of the connecting bolt (6) is an internal hexagon or an external hexagon.

6. A plastic extrusion die according to claim 1, characterized in that, The channel wall (4) and the mounting wall (5) can move relative to each other.

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