Plastic extrusion die

Abstract

The utility model discloses a plastic extrusion die, which relates to the field of plastic forming dies, 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; a heating device is arranged on the side wall, close to the outlet end, of the extrusion runner. The heating device is arranged at the outlet end of the extrusion runner, and the end face of the extrusion runner is heated all the time during extrusion molding, so that an extrusion port of the extrusion runner is kept at a high temperature, the situation that molten plastic is cooled and condensed on the end face after leaving the extrusion runner is prevented, and the situation of material hanging can be effectively prevented; therefore, the situation that plastic particles or blocks are wrapped in the extrusion runner is avoided.

Description

Technical Field

[0001] The utility model belongs to the field of plastic forming dies, in particular to a plastic extrusion die. Background Art

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

[0003] Extrusion molding is a common method of forming plastic products. High-temperature molten plastic and other materials are injected into the extrusion mold through an extruder, and then the plastic is extruded into the form of sheets or cylinders through the extrusion mold. After extrusion, the molten plastic leaves the high-temperature environment and quickly condenses and forms in the air, thus obtaining a plastic product.

[0004] The extrusion flow channels of existing plastic extrusion molding dies are almost all linear flow channels.

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

[0006] (1) After the molten plastic is extruded, the linear type easily forms solidified particles or blocks when the end face of the extrusion channel is cooled, which is the hanging material phenomenon.

[0007] (2) The farther the extrusion flow channel is from the central buffer cavity of the extrusion die, the lower the temperature of the extrusion die, resulting in a lower temperature of the molten plastic. The plastic particles or blocks condensed at the extrusion outlet are likely to fall into the extrusion flow channel, and the temperature of the molten plastic at the extrusion outlet is not enough to melt the fallen plastic particles or blocks immediately. These plastic particles or blocks will be entrained in the molten plastic. After cooling, the molten plastic entrained with plastic particles or blocks will have obvious defects such as uneven texture and particles or blocks. Utility Model Content

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

[0009] The technical solution adopted by this utility model is:

[0010] A plastic extrusion die comprises a first die body and a second die body that fit together, an extrusion flow channel is provided between the first die body and the second die body; a heating device is provided on the side wall of the extrusion flow channel near the outlet end.

[0011] Optionally, the extrusion channel is a circular hole, the extrusion die is conical, an annular groove is provided on the outer side wall of the extrusion channel near the outlet end, and the heating device is mounted in the annular groove.

[0012] Optionally, the extrusion flow channel is a square hole, and heating devices are provided in the two side walls of the first die body and the second die body close to the extrusion flow channel.

[0013] Optionally, the extrusion channel is a square hole, the outer side wall of the outlet end of the extrusion channel is tapered, and the heating device is placed on the tapered surface of the outer side wall of the extrusion channel.

[0014] Optionally, the heating device is an electric heater.

[0015] Optionally, the electric heater is an electric heating rod, an electric heating tube or a PTC electric heating plate.

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

[0017] The utility model provides a plastic extrusion die, comprising a first die body and a second die body that fit together, an extrusion channel being defined between the first die body and the second die body; and a heating device being provided on a side wall of the extrusion channel near an outlet end. By providing the heating device at the outlet end of the extrusion channel, the end face of the extrusion channel is constantly heated during extrusion molding, so that the extrusion outlet of the extrusion channel is maintained at a relatively high temperature, thereby preventing molten plastic from cooling and condensing on the end face after leaving the extrusion channel. This effectively prevents the occurrence of material hanging, thereby eliminating the possibility of plastic particles or lumps being trapped in the extrusion channel. BRIEF DESCRIPTION OF THE DRAWINGS

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

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

[0020] Figure 3 This is an enlarged schematic diagram of the heating device placed in the two side walls of the extrusion flow channel.

[0021] Figure 4 It is an enlarged schematic diagram of a heating device placed on the tapered surface of the outer side wall of the extrusion flow channel.

[0022] In the figure: 1-extrusion die, 2-extrusion flow channel, 3-heating device. DETAILED DESCRIPTION

[0023] Example 1:

[0024] In this embodiment, if Figure 1The plastic extrusion die shown in the figure comprises a first die body and a second die body that fit together, with an extrusion channel 2 defined between them. A heating device 3 is provided on the sidewall of the extrusion channel 2 near the outlet end. By providing the heating device 3 at the outlet end of the extrusion channel 2, the end face of the extrusion channel 1 is constantly heated during extrusion molding, maintaining a relatively high temperature at the outlet end face of the extrusion channel 1. This prevents the molten plastic from cooling and solidifying on the end face after leaving the extrusion channel, effectively preventing the occurrence of material hanging and thus eliminating the possibility of plastic particles or lumps being trapped within the extrusion channel 2.

[0025] In this embodiment, if Figure 2 As shown, the extrusion channel 2 is a circular hole, the extrusion die 1 is conical, and an annular groove is formed on the outer wall of the extrusion channel 2 near the outlet end. The heating device 3 is mounted within the annular groove. The extrusion die 1 in this embodiment is used to extrude cylindrical plastic, so its extrusion channel 2 is a circular channel. The heating device 3 is mounted within the annular groove on the outer wall of the extrusion channel 2 and heats the entire extrusion channel 2 from the circumference, thereby ensuring that the temperature at the outlet end of the extrusion channel 2 does not condense the molten plastic.

[0026] In this embodiment, the heating device 3 can be an electric heater such as an electric heating rod, an electric heating tube or a PTC electric heating plate.

[0027] Example 2:

[0028] The extrusion die 2 in this embodiment is used to extrude the plastic of the sheet, so Figure 3 As shown, the extrusion channel 2 is a square hole, and heating devices 3 are provided in the two side walls of the first die body and the second die body close to the extrusion channel 2.

[0029] Specifically, the sidewalls of the first and second mold bodies are provided with through-holes, allowing heating devices 3 to be placed directly from both ends of the first and second mold bodies. By simultaneously heating the rectangular extrusion channel 2 from both sides, the entire channel 2 is effectively heated, thereby maintaining the temperature of the molten plastic within. Furthermore, the heating device 3 is positioned near the extrusion end face of the extrusion channel 2, effectively heating the end face and preventing material from hanging.

[0030] In other embodiments, Figure 4 As shown, the extrusion channel 2 is a square hole, the outer wall of the outlet end of the extrusion channel 2 is tapered, and the heating device 3 is placed on the tapered surface of the outer wall of the extrusion channel 2.

[0031] In this utility model, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection; direct connection, indirect connection through an intermediate medium, internal communication between two components, or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on specific circumstances.

[0032] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. 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 any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and features of different embodiments or examples without contradiction.

[0033] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are illustrative and cannot be understood as limitations on the present invention. Ordinary technicians in this field can change, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. A plastic extrusion die, characterized in that: The extrusion die (1) comprises a first die body and a second die body that fit together, and an extrusion flow channel (2) is provided between the first die body and the second die body; A heating device (3) is provided on the side wall of the extrusion flow channel (2) close to the outlet end.

2. A plastic extrusion die according to claim 1, characterized in that: The extrusion flow channel (2) is a circular hole, the extrusion die (1) is conical, an annular groove body is provided on the outer side wall of the extrusion flow channel (2) near the outlet end, and the heating device (3) is sleeved in the annular groove body.

3. A plastic extrusion die according to claim 1, characterized in that: The extrusion flow channel (2) is a square hole, and heating devices (3) are provided in the two side walls of the first die body and the second die body close to the extrusion flow channel (2).

4. A plastic extrusion die according to claim 1, characterized in that: The extrusion flow channel (2) is a square hole, the outer side wall of the outlet end of the extrusion flow channel (2) is conical, and the heating device (3) is placed on the conical surface of the outer side wall of the extrusion flow channel (2).

5. A plastic extrusion die according to claim 4, characterized in that: The heating device (3) is an electric heater.

6. A plastic extrusion die according to claim 5, characterized in that: The electric heater is an electric heating rod, an electric heating tube or a PTC electric heating plate.

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