JPH0230262Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to a twin-screw extruder, especially two screws rotating in the same direction.
Regarding shaft extruders.

Twin-screw extruders have a high kneading effect and are therefore widely used as kneaders for various plastics and fillers. However, when changing the resin etc., there are many cases where it is desired to adjust the kneading performance to match the change, and in order to change the kneading performance, conventionally, the screw element constituting the screw shaft was replaced and replaced with a screw of a different dimension. This screw reassembly work requires that the molten resin pass through the screw shaft and adhere to it, and that the screw shaft has two shafts, so the barrel that covers the screw shaft must be moved to the front end of the screw shaft. After pulling it out and removing it, it is not enough to remove the screw alone and clean it with rags, chemicals, etc. on the spot. Instead, it is necessary to remove the entire screw shaft from the screw shaft drive gear box, which will be described later, and replace the screw at another location. Commonly done. Therefore, recombining the screws requires a lot of time and involves a lot of work. Furthermore, it is necessary to prepare screw elements with different screw dimensions, which increases the cost.

The present invention solves this problem, without having to replace the screw element that makes up the screw shaft and reassemble it into a screw of a different dimension. By attaching and removing one or more length adjustment members on the base, the length of the barrel can be substantially increased or decreased, and the working characteristics with the screw forming the screw shaft can be changed to adjust the kneading performance. An object of the present invention is to provide a twin-screw extruder.

In order to achieve the above purpose, in this invention,
From the material supply side, a deep groove normal feed screw, a shallow groove reverse feed screw whose outer diameter is smaller than the deep groove normal feed screw, and a shallow groove normal feed screw having the same outer diameter as the shallow groove reverse feed screw are connected in series. a screw shaft arranged and connected to the screw row, a deep groove screw barrel having an inner diameter into which a deep groove screw corresponding to a deep groove normal feed screw and a shallow groove reverse feed screw can be fitted, and a deep groove screw shaft connected to the shallow groove normal feed screw. A shallow groove screw barrel having an inner diameter into which a corresponding shallow groove screw can be inserted, and one or more barrel length adjusting members corresponding to the length of the shallow groove reverse feed screw are provided at the base of the material supply side. A twin screw extruder is provided.

The following Figures 1 to 3 show an embodiment of the present invention.
This will be explained using figures. Note that FIGS. 1 and 2 show different states.

In Fig. 1, the screw shaft 11 includes, from the right side of the figure, a deep groove normal feed screw 12 with a large diameter, a shallow groove reverse feed screw 13 with a shallow groove and a smaller outer diameter than the deep groove normal feed screw 12, and a shallow groove reverse feed screw 13 with a shallow groove smaller in outer diameter than the deep groove normal feed screw 12. A reverse feed screw 13 and a shallow groove normal feed screw 14 having the same outer diameter are arranged and connected in series. A barrel 15 on the outer periphery of the screw shaft 11
For the shallow groove reverse feed screw 13, there is provided a deep groove screw barrel 16 having an inner diameter that fits into the deep groove screw, and a shallow groove normal feed screw 1.
4 is divided into two into a shallow groove barrel 17 having an inner diameter that fits into the shallow groove. At the upper part of the deep groove screw barrel 16, corresponding to the deep groove normal feed screw 12, there is a hole 18 for supplying raw material, and a hopper 19 is installed above the hole 18. Further, on the right side of the deep groove screw barrel 16, as shown in FIG. 3, there are two length adjusting members 20 which are divided into upper and lower halves on the center line and whose central part has the same inner diameter as the deep groove screw barrel 16. has been established. Further, to the right is a gear box 21 in which a gear mechanism (not shown) for driving the screw shaft 11 is housed.

Now, to further explain the length adjusting member 20, the reason why it is provided in a position in contact with the gear box 20 on the right side of the raw material supply hole 18 in FIG. This is because when the molten resin is rotated and the molten resin is transferred, the molten resin does not pass through, so the molten resin does not adhere to the inside, making it easier to replace. Also, regarding the positional relationship between the barrel and the screw, especially the shallow groove reverse feed screw 13.
The two length adjusting members 20 are inserted so that the left end of the deep groove screw barrel 16 is located at the left end of the deep groove screw barrel 16.

In the structure shown in FIG. 1 described above, the shallow groove reverse feed screw 13 is located in the barrel for the deep groove screw with a large inner diameter, so the volume between the shallow groove reverse feed screw 13 and the corresponding part of the barrel is large, so the reverse feed It has almost no effect and does not apply back pressure to the molten resin, so it is used for extruding resins that do not require high kneading properties.

For resins that require kneadability, the structure shown in Figure 2 is used. In FIG. 2, the same members as those in FIG. 1 are given the same reference numerals, detailed explanations are omitted, and only the different parts will be explained. Fig. 2 shows the two length adjusting members 20 in Fig. 1 removed, and the barrel 16 for deep groove screws and the barrel 17 for shallow grooves have been moved to the right in the figure, but the configuration of screw shaft 11 is not the same. Since it is not changed, the shallow groove reverse feed screw 13 enters the barrel 17 for shallow groove screw, and the volume of the shallow groove reverse feed screw 13 and the corresponding part of the barrel becomes smaller, increasing the reverse feed action and backing up the molten resin. Kneadability is improved by applying pressure.

If one length adjustment member 20 is removed, the shallow groove reverse feed screw 13 will be located across both the shallow groove screw barrel 17 and the deep groove screw barrel 16, so the above-mentioned action will The kneading properties are intermediate between those in FIGS. 1 and 2. In the above explanation, the number of length adjustment members 20 was assumed to be two, but if the dimensions are subdivided and the number is increased within the dimension that can be supported by two adjustment members 20, the results shown in Figs. 1 and 2 can be obtained. Fine adjustments can be made between kneading properties.

Since the present invention is configured as described above, when changing the kneading performance of the extruder, the length of the deep groove barrel 16, which can be easily replaced to a position where the molten resin does not pass, can be substantially increased or decreased. Since the height adjustment member 20 can be divided and changed,
Since the screw dimension remains the same as in the past, the time required for changes is shortened, which increases productivity and lowers costs.This invention also has the effect of ensuring that the resin is always extruded with optimum kneading. has.

[Brief explanation of the drawing]

1 and 2 are cross-sectional views showing an embodiment of the present invention in different usage conditions, and FIG. 3 is a cross-sectional view taken along the line AA in FIG. 1. 11...Screw shaft, 12...Deep groove forward feed screw, 13...Shallow groove reverse feed screw, 14...
...Shallow groove forward feed screw, 15...Barrel, 16
... Barrel for deep grooves, 17 ... Barrel for shallow grooves, 18 ... Hole for supplying raw materials, 19
...Hotsupa, 20...Length adjustment member, 21...Gear box.

Claims (1)

[Scope of utility model registration request] From the material supply side, a deep groove normal feed screw, a shallow groove reverse feed screw whose outer diameter is smaller than the deep groove normal feed screw, and a shallow groove normal feed screw having the same outer diameter as the shallow groove reverse feed screw are connected in series. a screw shaft arranged and connected to the screw row; a deep groove screw barrel having an inner diameter into which a deep groove screw corresponding to a deep groove normal feed screw and a shallow groove reverse feed screw are inserted; A barrel for a shallow groove screw having an inner diameter into which a corresponding shallow groove screw is inserted, and a barrel having a length corresponding to the length of the shallow groove reverse feed screw.
A twin-screw extruder having one or more barrel length adjusting members at the source on the material supply side.