JP5844543B2 - Molten resin screw extruder - Google Patents

Description

  According to the present invention, a resin charged into one end of a cylinder-shaped housing is thermally melted in the housing, and the molten resin is extruded from the other end of the housing by a screw rotating in the housing. More specifically, the present invention relates to a molten resin screw extruder in which a viewing window is formed in the housing to make various states such as a molten state of the resin in the housing visible from the outside of the housing. Is.

  Conventionally, there is a screw-type extruder for the molten resin disclosed in Patent Document 1 below. According to this publication, a molten resin screw-type extruder includes a cylinder-shaped housing, a screw inserted into the housing on the axis of the housing, and driven to rotate about the axis, and the housing And a plurality of viewing windows which are formed intermittently at a predetermined pitch in the axial direction and which allow the inside of the housing to be visually recognized. Then, the resin charged into one end side in the axial direction of the housing is thermally melted in the housing and pushed out from the other end of the housing toward a resin molding machine such as a die by the rotation of the screw. The resin thus extruded is formed to be a desired resin molded product such as a pipe by the resin molding machine.

  Here, various states of the resin transported state, heat-melted state, and kneaded state while the resin charged into the one end portion side of the housing is pushed out from the other end portion are visually confirmed through the viewing windows. It can be perceived.

  According to the visual perception of the various states of the resin described above, such as the shape of the pitch and outer diameter of the screw that conveys and kneads the resin in the housing, the number of rotations of the screw, the capacity of the heater, etc. Reexamination and reconfirmation of the specifications of the extruder can be performed with high accuracy, so that the state of the resin extruded from the extruder can be made more optimal for the formation of the molded product formed of this resin. It is said.

  Conventionally, there is one disclosed in Patent Document 2 below. The thing of this gazette is substantially the same structure and the same action as the thing of the said patent document 1, However, The elongate slit-shaped visual recognition window continuously extended in the axial direction is formed in the circumferential direction part of the housing. Has been.

JP 2009-226597 A JP-A-1-295814

  By the way, as described above, the visual recognition window according to Patent Document 1 described above is intermittently provided at a predetermined pitch in the axial direction in a part of the circumferential direction of the housing. For this reason, the visual perception of the various states of the resin in the housing described above is limited to the discontinuity in the axial direction of the housing. Therefore, the content of the perception lacking in continuity may be insufficient for reexamination and reconfirmation of the specifications of the extruder, and there is still room for improvement. Yes.

  On the other hand, as described above, the viewing window according to Patent Document 2 has a long slit shape that extends continuously in the axial direction at a part of the circumferential direction of the housing. For this reason, visual perception of the various states of the resin in the housing described above can be made continuously in this axial direction. And such continuous perception is preferable because it is possible to reexamine and reconfirm the specifications of the extruder with higher accuracy.

  However, in the housing, the screw rotates so as to push out from the other end while pressurizing the resin, and the internal pressure may reach, for example, 50 MPa. Therefore, the housing needs to have sufficient strength. . For this reason, when the viewing window has a long slit shape as described above, the strength of the housing may be insufficient in view of the internal pressure in the housing, which is not preferable in terms of the strength of the housing. .

  The present invention has been made paying attention to the above-described circumstances, and the object of the present invention is to thermally melt the resin charged into one end portion of a cylinder-shaped housing in an extruder. When pushing out from the other end of the housing by a screw rotating in the housing, the housing is secured with sufficient strength, while the visual perception of various states of the resin in the housing It is to be able to continuously perform in the axial direction so that the state of the resin extruded from the extruder can be made more optimal for the formation of a formed product formed from this resin.

The present invention includes a cylinder-shaped housing 11, a screw 13 that is inserted into the housing 11 on the shaft center 10 of the housing 11, and is driven to rotate around the shaft center 10, and a plurality of shafts 11 in the axial direction of the housing 11. And a plurality of viewing windows 23 that are visible at the inside of the housing 11, and the resin 2 introduced into one end side in the axial direction of the housing 11 is melted in the housing 11. In the screw extruder of the molten resin, the screw 13 is pushed out from the other end of the housing 11 toward the resin molding machine 5 by the rotation R of the screw 13.
Among the viewing windows 23, some of the viewing windows 23 (A) are arranged at predetermined intervals in the axial direction of the housing 11 in the circumferential part 11 a of the housing 11, A plurality of viewing windows 23 (B) are arranged at predetermined intervals in the axial direction of the housing 11 at the other portion 11 b in the circumferential direction of the housing 11 that is displaced from the portion 11 a in the circumferential direction of the housing 11. Each of the viewing windows 23 (A) and 23 (B) is alternately arranged in the part 11a and the other part 11b of the housing 11 as it goes from the one end side in the axial direction of the housing 11 to the other end side. Placed in
The viewing window 23 (A) of the part 11 a of the housing 11 and the viewing window 23 (B) of the other part 11 b of the housing 11 that are adjacent to each other in the axial direction of the housing 11 face each other in the axial direction of the housing 11. The opposing end portions 23a and 23b partially overlap each other by a predetermined distance in the circumferential direction of the housing 11 ,
The angle formed by the part in the circumferential direction of the housing and the other part is 90 ° or less,
The screw extruder of a molten resin, wherein the predetermined dimension is 1/4 to 1/2 times the pitch dimension of the screw blade .

  In addition, in this section, the reference numerals and drawing numbers appended to the above terms are not intended to limit the technical scope of the present invention to the “Example” section and the contents of the drawings described later.

  The effects of the present invention are as follows.

The present invention includes a cylinder-shaped housing, a screw inserted into the housing on the axis of the housing and driven to rotate around the axis, and formed at a plurality of locations in the axial direction of the housing. A plurality of viewing windows that allow the inside to be visually recognized, and the resin charged into one end in the axial direction of the housing is thermally melted in the housing and the other end of the housing is rotated by the rotation of the screw. In the screw type extruder for molten resin that is extruded toward the resin molding machine from
Among the viewing windows, a part of the plurality of viewing windows is arranged at a predetermined interval in the axial direction of the housing in a part of the circumferential direction of the housing, and the other plurality of viewing windows are arranged in the housing. Is disposed at a predetermined interval in the axial direction of the housing at another portion in the circumferential direction of the housing that is deviated from the portion in the circumferential direction, and is directed from one end side to the other end side in the axial direction of the housing. Accordingly, the viewing windows are alternately arranged one part and the other part of the housing.

Therefore, before SL viewing window described in the prior art is compared with that of the slit-shaped elongate extending continuously long in the axial direction of the housing, this housing can be secured a sufficient strength.

As described above, while ensuring sufficient strength in the housing, two viewing windows adjacent to each other in the axial direction of the housing can be arranged as continuously as possible in the axial direction of the housing. By visually recognizing the inside of the housing, visual perception of various states of the resin in the housing can be performed more continuously and accurately in the axial direction of the housing. Therefore, according to such an accurate perception that is continuous in the axial direction of the housing, the specifications of the extruder can be reviewed and reconfirmed more accurately. As a result, the state of the resin extruded from the extruder can be made more optimal for a molded product formed from this resin.

In addition, as described above, the viewing windows are alternately arranged in one part and the other part in the circumferential direction of the housing as it goes from the one end side in the axial direction of the housing to the other end side. . Therefore, it becomes easier to visually recognize the inside of the housing through the viewing windows than the viewing windows are simply distributed in the circumferential direction of the housing. Therefore, the visual perception of the various states of the resin inside the housing can be made with higher accuracy, and accordingly, the reexamination and reconfirmation of the specifications of the extruder can be made with higher accuracy.

In addition, the opposing end portions facing each other in the axial direction of the housing in the viewing window of a part of the housing adjacent to each other in the axial direction of the housing and the viewing window of the other part of the housing are arranged in the circumferential direction of the housing. It overlaps partly by a predetermined dimension .

For this reason, after visually recognizing the inside of the housing through the viewing window of a part of the housing, and subsequently visually recognizing the inside of the housing through the viewing window of the other part of the housing, The inside of the same position in the axial direction of the housing can be visually recognized almost simultaneously through each of the opposing end portions. Therefore, the visual perception of the various states of the resin inside the housing can be made more continuously and accurately in the axial direction of the housing, and accordingly, the reexamination and reconfirmation of the specifications of the extruder can be further improved. I can do it well.

Further , the angle formed by the part and the other part in the circumferential direction of the housing is set to 90 ° or less.

For this reason, when the interior of the housing is viewed through the viewing window of a part of the housing and the viewing window of the other part sequentially, one viewing window and the other viewing window of the viewing windows are Since the angle formed by the two is 90 ° or less and is close to each other in the circumferential direction of the housing, it is easy and smooth to see the inside of the housing through the one viewing window and the other viewing window sequentially. Can be. Therefore, the visual perception of the various states of the resin inside the housing can be made with higher accuracy, and accordingly, the reexamination and reconfirmation of the specifications of the extruder can be made with higher accuracy.

It is a top view. It is a side view. FIG. 3 is a cross-sectional view taken along line III-III in FIG. 1. FIG. 4 is a development view taken along line IV-IV in FIG. 3.

  The molten resin screw-type extruder of the present invention relates to a resin charged into one end of a cylinder-shaped housing in the extruder, and heat-melts the resin in the housing, and the screw rotates in the housing. In the case of pushing out from the other end, the housing is secured with sufficient strength, while the visual perception of various states of the resin in the housing can be continuously made in the axial direction of the housing, In order to realize the object of enabling the state of the resin extruded from the extruder to be more optimal for the formation of a molded article formed by this resin, the form for carrying out the present invention is as follows. It is like this.

  That is, a screw extruder of a molten resin includes a cylinder-shaped housing, a screw inserted into the housing on the axis of the housing, and driven to rotate around the axis, and a plurality of axial positions of the housing. And a plurality of viewing windows that are formed so as to be visible inside the housing. The resin charged into one end side in the axial direction of the housing is melted in the housing and is pushed out from the other end of the housing toward the resin molding machine by the rotation of the screw.

Among the viewing windows, some of the viewing windows are arranged at predetermined intervals in the axial direction of the housing in a part of the circumferential direction of the housing, and the other viewing windows of the other parts are the housing. In the other circumferential direction of the housing that is deviated from the portion in the circumferential direction, the housing is disposed at a predetermined interval in the axial direction of the housing. As each of the viewing windows is directed from one end side to the other end side in the axial direction of the housing, the viewing windows are alternately arranged in one part and the other part of the housing. The opposing end portions facing each other in the axial direction of the housing overlap each other in the circumferential direction of the housing in the viewing window of a part of the housing adjacent to each other in the axial direction of the housing and the viewing window of the other part of the housing. It is said.

  In order to explain the present invention in more detail, an embodiment thereof will be described with reference to the accompanying drawings.

  In the figure, reference numeral 1 denotes an extrusion molding machine. The extrusion molding machine 1 heats and melts a thermoplastic resin 2 to continuously extrude it toward the front Fr, and this extruder. And a resin molding machine 5 for forming the resin 2 extruded from 3 into a desired molded product 4.

  When the molded product 4 is a long body such as a pipe, the resin molding machine 5 is a die having a die hole through which the molten resin passes. When the molded product 4 is an injection molded product, the resin molding machine 5 is a mold having a cavity into which the molten resin flows.

  The extruder 3 includes a gantry 9 installed on a work floor 8, a cylinder-shaped housing 11 having a shaft center 10 extending horizontally and supported by a fastener on the gantry 9, and a shaft center 10 of the housing 11. The screw 13 is inserted into the screw hole 12 in the housing 11 and can be rotated R in one direction around the axis 10, and one end side (rear end side) of the housing 11 in the axial direction. A hopper 14 that protrudes and allows the resin 2 to be introduced into the housing 11, and is supported by the mount 9 and connected to one end portion (rear end portion) of the screw 13 in the axial direction. An electric motor 15 that is capable of rotating R as much as possible, and a heater 16 that is attached to the outer surface of the housing 11 over substantially the entire axial direction of the housing 11 are provided. The shifting range of the screw 13 is 0 to 150 r. p. m.

  The screw 13 includes a screw shaft 19 positioned on the shaft center 10 and a blade 20 that protrudes integrally on the outer surface of the screw shaft 19 and has a right-hand thread shape. The outer diameter D of the screw shaft 19 is increased stepwise from the one end side of the screw 13 toward the other end side. On the other hand, the pitch dimension P of the blade 20 is a constant dimension. The direction of rotation R of the screw 13 is counterclockwise when the screw 13 is viewed from a line of sight (line of sight toward the front) from one end to the other end.

  Specifically, the housing 11 and the screw 13 are made of metal, and the inner diameter dimension of the screw hole 12 of the housing 11 is slightly larger than the outer diameter dimension of the screw 13, and the pitch dimension of the blades 20 of the screw 13. The value is substantially the same as P, and is 30 to 50 mm.

  A plurality (10) of viewing windows 23 are formed at a plurality of locations in the axial direction of the housing 11 to make the inside of the housing 11 visible. Each of these viewing windows 23 is formed in the housing 11, and a bottom portion thereof is an insertion hole 24 close to the screw hole 12, and a communication hole 25 formed so as to communicate with the screw hole 12 from the bottom portion of the insertion hole 24. And a glass transparent body 26 fitted into the fitting hole 24, and a presser plate 28 fastened to the outer surface of the housing 11 by a fastener 27 to prevent the transparent body 26 from coming out of the fitting hole 24. I have.

  A visual recognition hole 29 is provided in the presser plate 28, and the insertion hole 24, the communication hole 25, and the transparent body 26 are seen in a cross-sectional view of the visual recognition window 23 as viewed along the axis 10 (FIG. 3). Each center 31 of the presser plate 28 and the visual recognition hole 29 is located on a line orthogonal to the axis 10 and has a shape extending long in the axial direction of the housing 11. A substantial range of the visual window 23 that makes the inside of the housing 11 visible is defined by the visual hole 29.

  A pressure sensor 32 that detects the pressure of the resin 2 inside the housing 11 and a temperature sensor 33 that detects the temperature of the resin 2 inside the housing 11 are attached to the housing 11.

  When the molded product 4 of the resin 2 is formed by the extruder 1, first, the resin 2 such as pellets as a raw material is passed through the hopper 14 of the extruder 3 in one end side in the axial direction of the housing 11 ( To the rear end). Then, the resin 2 is conveyed toward the other end side (front end side) inside the housing 11 by the rotation R of the screw 13. In the middle of the conveyance, the resin 2 is melted by heating by the heater 16 and is kneaded by the screw 13 and pushed out from the other end of the housing 11 toward the resin molding machine 5. In the resin molding machine 5, the molded product 4 is formed.

  Here, one end side in the axial direction of the extruder 3 is a portion called a conveyance (or supply) zone 34, and the outer diameter D of the screw shaft 19 of the screw 13 is reduced in the conveyance zone 34. Thus, the transport amount (kg / min) of the resin 2 by the extruder 3 is increased.

  Further, an intermediate portion in the axial direction of the extruder 3 is a portion referred to as a heat melting (or compression) zone 35, and the outer diameter D of the screw shaft 19 of the screw 13 is increased in the heat melting zone 35. Therefore, the conveyance amount of the resin 2 by the extruder 3 is reduced. Therefore, the resin 2 is sufficiently melted by heating by the heater 16 and is kneaded while being compressed by the resin 2 supplied from the transport zone 34.

  Further, the other end side in the axial direction of the extruder 3 is a portion referred to as a metering zone 36, and in this metering zone 36, the outer diameter dimension D of the screw shaft 19 of the screw 13 is made larger, The conveyance amount of the resin 2 by the machine 3 is further reduced. For this reason, the resin 2 is more sufficiently kneaded and compressed by the screw 13, extruded from the other end of the housing 11, and supplied to the resin molding machine 5.

  On the other hand, the transport state of the resin 2 in each of the zones 34 to 36, the heat-melted state, and the various states of the kneaded resin 2 can be visually perceived through the viewing windows 23.

  According to the visual perception of the various states of the resin 2 described above, the shape such as the pitch dimension P and the outer diameter dimension D of the screw 13 that conveys and kneads the resin 2 in the housing 11, and the rotational speed of the screw 13. , And the specifications of the extruder 3 such as the capacity of the heater 16 can be accurately reviewed and reconfirmed. Therefore, the state of the resin 2 extruded from the extruder 3 can be made more optimal for the formation of the molded product 4 formed by the resin 2.

  In the above configuration, of the two viewing windows 23 (A) and 23 (B) adjacent to each other in the axial direction of the housing 11, one viewing window 23 (A) and the other viewing window 23 (B) are connected to the housing. 11 are offset from each other in the circumferential direction.

  For this reason, if the two opposing windows 23 (A) and 23 (B) adjacent to each other in the axial direction of the housing 11 are opposed to each other in the axial direction, Even if the two viewing windows 23 (A) and 23 (B) are arranged as continuously as possible in the axial direction of the housing 11 by being overlapped in the circumferential direction of the housing 11, the above-described conventional technique has been described. The housing 11 can ensure sufficient strength as compared with a long slit-shaped window whose viewing window 23 extends continuously in the axial direction of the housing 11.

  And as mentioned above, while ensuring sufficient intensity | strength to the housing 11, since the said two adjacent visual recognition windows 23 (A) and 23 (B) can be arrange | positioned continuously as much as possible in the axial direction of the housing 11, the above-mentioned By visually recognizing the inside of the housing 11 through each viewing window 23, visual perception of various states of the resin 2 in the housing 11 can be made more continuously and accurately in the axial direction of the housing 11. Therefore, according to such an accurate perception that is continuous in the axial direction of the housing 11, the specifications of the extruder 3 can be reviewed and reconfirmed more accurately. As a result, the state of the resin 2 extruded from the extruder 3 can be made more optimal for the molded product 4 formed from the resin 2.

  Further, a plurality of the one viewing windows 23 (A) are disposed in the circumferential portion 11 a of the housing 11, and the other viewing window 23 (B) is disposed in the circumferential portion 11 b of the housing 11. A plurality are provided.

  For this reason, the one viewing window 23 (A) and the other viewing window 23 (B) are part of the circumferential direction of the housing 11 as it goes from the one end side in the axial direction of the housing 11 to the other end side. 11a and other portions 11b are alternately arranged. Therefore, it is easier to visually recognize the inside of the housing 11 through the viewing windows 23 than when the viewing windows 23 are simply distributed in the circumferential direction of the housing 11. Therefore, the visual perception of the various states of the resin 2 inside the housing 11 can be made with higher accuracy, and the specifications of the extruder 3 can be reviewed and reconfirmed accordingly.

  Further, the two adjacent viewing windows 23 (A) and 23 (B) are opposed to each other in the circumferential direction of the housing 11 in the axial direction of the housing 11.

  For this reason, when the inside of the housing 11 is viewed through the one viewing window 23 (A) and then the interior of the housing 11 is viewed through the other viewing window 23 (B), both of these During visual recognition, the inside of the same position in the axial direction of the housing 11 can be visually recognized almost simultaneously through the opposing end portions 23a and 23b. Therefore, the visual perception of the various states of the resin 2 inside the housing 11 can be made more continuously and accurately in the axial direction of the housing 11, and accordingly, the specifications of the extruder 3 are reviewed and reconfirmed accordingly. However, it can be made with higher accuracy.

  Specifically, the dimension L in which the mutually opposing end portions 23 a and 23 b of the two adjacent viewing windows 23 (A) and 23 (B) overlap in the circumferential direction of the housing 11 is the blade 20 of the screw 13. The pitch dimension P is set to 1/2 to 1/4 times the pitch dimension P.

  Further, an angle θ formed by the portion 11a and the other portion 11b in the circumferential direction of the housing 11 is set to 100 ° or less, preferably 90 ° or less.

  For this reason, when the inside of the housing 11 is viewed through the one viewing window 23 (A) and the other viewing window 23 (B) sequentially, the one viewing window 23 (A) and the other viewing window are displayed. 23 (B) is that the angle θ formed by them is 100 ° or less and is close to each other in the circumferential direction of the housing 11, so that the one viewing window 23 (A) and the other viewing window 23 ( It is possible to easily and smoothly visually recognize the inside of the housing 11 through B). Therefore, the visual perception of the various states of the resin 2 inside the housing 11 can be made with higher accuracy, and the specifications of the extruder 3 can be reviewed and reconfirmed accordingly.

  Although the above is based on the illustrated example, the perception of the various states of the resin 2 inside the housing 11 does not have to be directly viewed through the viewing windows 23. For example, an indirect image captured by a television camera may be used. It may be visually perceived or indirectly perceived by image processing such as combining these captured images and visually perceived.

DESCRIPTION OF SYMBOLS 1 Extruder 2 Resin 3 Extruder 4 Molded article 5 Resin molding machine 10 Shaft center 11 Housing 11a Part 11b Other part 12 Screw hole 13 Screw 14 Hopper 15 Electric motor 16 Heater 19 Screw shaft 20 Blade 23 View window 23a Opposite end 23b Opposing end portion 24 Insertion hole 25 Communication hole 26 Transparent body 27 Fastener 28 Presser plate 29 Viewing hole 31 Center 34 Transport zone 35 Heat melting zone 36 Measurement zone D Outer diameter dimension L Overlapping dimension P Pitch dimension R Rotation Fr Forward θ Angle

Claims (1)

Cylinder-shaped housing, screw inserted into the housing on the axis of the housing, and driven to rotate around the axis, and formed at a plurality of locations in the axial direction of the housing so that the inside of the housing can be visually confirmed A resin molding machine that melts the resin charged in one end side in the axial direction of the housing in the housing and rotates the screw from the other end of the housing. In the screw extruder of the molten resin that is extruded toward
Among the viewing windows, a part of the plurality of viewing windows is arranged at a predetermined interval in the axial direction of the housing in a part of the circumferential direction of the housing, and the other plurality of viewing windows are arranged in the housing. Is disposed at a predetermined interval in the axial direction of the housing at another portion in the circumferential direction of the housing that is deviated from the portion in the circumferential direction, and is directed from one end side to the other end side in the axial direction of the housing. According to the above, each of the viewing windows is alternately arranged in one part and the other part of the housing,
The opposing end portions facing each other in the axial direction of the housing in the viewing window of a part of the housing adjacent to each other in the axial direction of the housing and the viewing window of the other part of the housing have predetermined dimensions in the circumferential direction of the housing. Only partially overlap ,
The angle formed by the part in the circumferential direction of the housing and the other part is 90 ° or less,
A screw extruder for a molten resin, wherein the predetermined dimension is set to 1/4 to 1/2 times the pitch dimension of the screw blade .

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