JPH0742697Y2 - Breaker plate and resin extrusion equipment - Google Patents

Description

[Detailed description of the device] [Industrial applications]

The present invention relates to a breaker plate and a resin extruding device which are useful in extruding a resin such as rubber or plastic containing an additive such as a cross-linking agent.

[Prior art]

Conventionally, a two-step extrusion method is adopted, and for example, as shown in FIG. 2, when a plastic resin such as polyethylene is mixed with additives such as a crosslinking agent and an antioxidant, the first extruder 1 is used.
A crosshead 4 forming a connecting part is connected to the above via a filter part 2, a cooling part 3, etc., and the additive press-fitted to the crosshead 4 is injected into the plastic resin supplied from the first extruder 1. Press the desired amount of additive from device 5,
After mixing, the mixed plastic resin is guided to the second extruder 6, and from the head portion 7 of the second extruder 6,
For example, a method has already been proposed in which the electric wire conductor 8 is extrusion-coated with a plastic resin as the insulator 9.

[Problems to be solved by the device]

In such a resin extruder, the resin kneaded in the second extruder 6 portion passes through the resin passage hole 11 of the breaker plate 10 as shown in FIG. 3, for example. Since the flow path resistance is relatively large, heat is generated and the temperature of the resin rises. At this time, if the resin passing through this contains a crosslinking agent as an additive as described above, the temperature rise of this resin causes a crosslinking reaction at the relevant portion, so-called scorch (early crosslinking). There was a problem that it occurred. In view of such conventional circumstances, the present invention provides a breaker plate having a cooling means and a resin extruding device for preventing the temperature rise of the breaker plate portion when the resin passes through.

[Means for Solving the Problems]

The breaker plate of the present invention is such that a cooling jacket through which a cooling medium passes is provided around each resin passage hole of the breaker plate of the extruder. In addition, the resin extruder of the present invention extrudes a resin such as rubber or plastic that does not contain an additive such as a cross-linking agent in the first extruder, and a cross-linking agent or the like in the resin at the connection portion with the second extruder. In a resin extruder in which the additive of (1) is pressed in and mixed, and the mixture is kneaded and extruded by a second extruder, a cooling jacket through which a cooling medium passes is provided around each resin passage hole of the breaker plate of the second extruder. It is provided.

[Action]

In the breaker plate of the present invention, since the cooling jacket through which the cooling medium passes is provided around each resin passage hole of the breaker plate, the temperature rise during the passage of the resin is effectively suppressed. Further, in the resin extruder of the present invention, even when the resin containing the additive such as the cross-linking agent passes through the second extruder,
Since the breaker plate is provided with the cooling jacket, the occurrence of scorch is effectively prevented.

【Example】

FIG. 1 shows an embodiment of a breaker plate in a resin extrusion apparatus according to the present invention. In this breaker plate 10A, a cooling jacket 12 is provided around each resin passage hole 11. The other components of the resin extrusion device are the same as those of the resin extrusion device of FIG. 2 described above. The structure of this cooling jacket 12 is not particularly limited,
For example, as shown in the drawing, it may be formed as an empty space surrounding the resin passage holes 11 ... The cooling medium supply port 13 is provided at two appropriate places in this empty space.
a and a discharge port 13b are provided, and a cooling medium circulation hose 14 from an external cooling medium circulation device (not shown) is connected to each of these ports 13a and 13b. Therefore, in the case of the breaker plate 10A, the resin extruded by the screw 15 is the resin passage holes 11 ...
When passing through, the heat is generated due to the flow path resistance of the holes 11 ..., This heat is absorbed by the cooling medium, such as water or oil, which is circulated and supplied around the outer periphery of the holes 11. As a result, the temperature rise of the resin is effectively suppressed. Therefore, even if the resin of the second extruder 6 of the present resin extruder contains a crosslinking agent as an additive, the generation of scorch is effectively prevented. Further, since the temperature does not rise excessively, the resin itself gives good results. Although the breaker plate 10A is used as the breaker plate of the second extruder 6 in the above embodiment, the present invention is not limited to this, and the resin containing the cross-linking agent can be used by a single extruder. As a breaker plate for preventing scorch when extruding, or as a breaker plate that removes various adverse effects due to temperature rise of other additive-containing resin, and further, in the case of no additive addition, excessive temperature rise Even as a breaker plate for an extruder that has the function of preventing the resin itself from being adversely affected by
It is possible to use.

[Effect of device]

As described above, according to the breaker plate and the resin extrusion device of the present invention, since the cooling jacket through which the cooling medium passes is provided around each resin passage hole, the temperature rise when the resin passes through the passage hole is effectively suppressed. For example, even in a resin containing a cross-linking agent as an additive, it is possible to prevent scorch. Of course, since the excessive temperature rise is prevented, the resin itself gives good results.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view showing an embodiment of a breaker blade in a resin extrusion device according to the present invention, and FIG. 2 is a schematic explanatory view of a resin extrusion device using a general two-stage extrusion method.
The figure is a vertical sectional view showing a conventional breaker blade of the resin extrusion apparatus of FIG. In the figure, 1 ... first extruder, 4 ... crosshead, 6 ... second
Extruder, 10A …… breaker plate, 11 …… resin passage hole, 12 …… cooling Janet, 14 …… cooling medium circulation hose,

Claims (2)

[Scope of utility model registration request] 1. A breaker plate characterized in that a cooling jacket through which a cooling medium passes is provided around each resin passage hole of a breaker plate of an extruder. 2. A first extruder extrudes a resin such as rubber or plastic containing no additive such as a cross-linking agent, and the additive such as a cross-linking agent is press-fitted into the resin at a connecting portion with a second extruder. In a resin extrusion device that mixes, and kneads and extrudes the mixture with a second extruder, a cooling jacket through which a cooling medium passes is provided around each resin passage hole of the breaker plate of the second extruder. And resin extrusion equipment.