JPS60116427A - Extrusion screw for resin in molding machine - Google Patents

Abstract

PURPOSE:To make temperature distribution in the longitudinal direction of an extrusion screw equal, and to eliminate the need for maintenance by burying a heat pipe having high heat transfer properties extending over a rear end from the nose of the extrusion screw. CONSTITUTION:A heat pipe 2 having high heat transfer properties is buried extending over a rear end from the nose of an extrusion screw 1 for an extrusion molding machine 3. The heat pipe 2 is constituted as shown in the fig. 5, and 7 represents a heating side seal, 8 a metallic wire wick, 9 a pipe body, 10 a pitch spiral pipe, 11 a cooling side seal and 12 a liquid sealing nozzle. The principle of operation is that a liquid 13 evaporates owing to heat applied to an evaporation section at a nose and the vapor of the liquid 13 transfers to a condensation section on the rear end side from the evaporation section along the direction of the arrow (a) because there is slight pressure difference in the vapor of the liquid. Accordingly, temperature distribution in the longitudinal direction of the extrusion screw can be made equal.

Description

[Detailed Description of the Invention] [Technical Field] The present invention mainly relates to a resin extrusion screw in a molding machine such as an extrusion molding machine or an injection molding machine, and more specifically, the temperature j! from the tip to the rear end of the extrusion screw. ! ! I flat B
-Relates to technology that aims to achieve positive change.

[Background technology]

Conventionally, in the extrusion screw of an extrusion molding machine, the resin material supplied from the hopper (4) is transferred to the extrusion screw (11).
The extruder is extruded into the tie while kneading the extruder, but in this case, the temperature is higher toward the tip of the extruder screw (11), so as shown in Fig. Extrude the cooled oil with the screw +1
The oil is supplied to the tip of the extrusion screw (I), and the oil heated by the heat of the high temperature section is transferred to the rear end of the extrusion screw (I) to even out the temperature distribution over the entire area of the extrusion screw (1). However, a configuration like this requires a circulation device for heat medium such as oil and a temperature control device such as a cooler, making the configuration complex and requiring maintenance and inspection. There was a problem.

[Purpose of the invention]

The present invention was made in view of such problems,
The object thereof is to provide a resin extrusion screw for a molding machine that can be simplified and maintenance-free due to its rational construction.

[Disclosure of the invention]

The present invention relates to a resin extrusion screw for a molding machine characterized by having a high heat transfer pipe (2) embedded from the tip to the rear end of the extrusion screw (1). With this configuration, we were able to achieve the above objectives.

Embodiments of the present invention will be described in detail below with reference to the drawings.

The extrusion screw (1) of an extrusion molding machine (3) as an example of a molding machine has a high heat transfer property from the tip to the rear end. The resin material supplied from Drive Hoshi P (6
) is kneaded and pumped to the tie (6) side by an extrusion screw f1) which is driven and rotated via a transmission part such as ). In such a case, the tip side of the extrusion screw (1) becomes hotter than the rear end side due to the extrusion resistance of the resin material, but heat is input from the tip of the buried screw (2) and heat is generated. Heat is released from the rear end of the pipe (2) to flatten the heat distribution.

The heat pipe (2) is configured as shown in FIG.
7) is a heating side seal, (8) is a metal wire wick, (
9) is a bone rest, (loj is a pitch spiral canal, (11)
(12) is a cooling side seal, and (12) is a liquid-filled nozzle. As shown in FIG. 4, the principle of operation of such a top pipe (2) is that heat applied to the evaporation section (heat input side) at the tip drips. Since the moving liquid (13) is sealed under reduced pressure, it easily boils. Since there is a slight pressure difference in the steam caused by boiling, it moves from the evaporating section to the condensing section on the rear end side in the direction of arrow A. By condensing the steam at the rear end, condensation! @Heat is released in the condensation area. At the same time, it may not be able to condense here and may evaporate. Next, the condensed working liquid (I3) returns to the evaporation section (tip side) by the pump action caused by capillary action. In such cases, gravity may be used. In Figure 4, 04) is a closed container, and 05) is a wick for liquid reflux.
If the pressure is increased to r and the working liquid (water) is filled in, the boiling point of water will be around 27°C. If there is a temperature difference between one end and the other end, boiling will continue,
Heat will be transported by steam flow. The operating temperature can then be changed by selecting the pressure setting. The wick of the sheet pipe (2) is shown in Figure 6 (a).
), the fiber 06 and spiral tube θη are installed inside the bone rest (9), the mesh (9) is installed inside the bone rest (9) as shown in (b), the same figure (C). There are various types, such as those in which a mesh is provided within the Giroux-JQ9), and those that use a continuous wick as shown in Figure (d). In addition to water, there are various other working liquids (13) such as sodium, mercury, methanol, anhydride, and acetone.

In addition, in the example, the extrusion screw (]) K of the extrusion molding machine
Although this has been described above, it may also be implemented in an injection molding machine or an extrusion screw f1+ for resin conveyance.

〔Effect of the invention〕

In short, the present invention embeds a highly heat-transferable pipe from the tip to the rear end of the extrusion screw, so the sheet pipe transfers heat from the high temperature part at the front end of the extrusion screw to the low temperature part at the rear end. Although it is possible to flatten the temperature distribution in the length direction of the extrusion screw, the structure can be simplified and no maintenance is required because only one screw is buried. It has the advantage of being possible.

[Brief explanation of the drawing]

Fig. 1 is a schematic explanatory diagram of the conventional example, Fig. 2 is a sectional view of the present invention, Fig. 3 is an enlarged sectional view of the same as the above, Fig. 4 is an explanatory diagram of the action of the same as the above, and Fig. 85 is the same as the above. Cross-sectional view along the length direction of Noshiito Pizu, Fig. 6 (a) (b) (c) (
d) is a cross-sectional view of another embodiment of the same pipe as above, (1) is an extrusion screw, and (2) is a pipe. Agent Patent Attorney Ishi 1) Choshichi

Claims (1)

[Claims] (1) A resin extrusion screw for a molding machine, characterized in that a pipe with high heat transfer properties is embedded from the tip to the rear end of the extrusion screw.