JPH063275A - Method and device for detecting kneaded state of fused resin - Google Patents

Abstract

PURPOSE:To observe the kneaded state of a fused resin without having the influence of the reflected light on a transparent body surface of a light emitted to a die inner part and the influence of an external light. CONSTITUTION:An extruder 10 has a holder 24 radially extending through a determined position of a die 18 and a cover 33 above the holder 24, and the holder 24 is fixed to the die 18 together with the cover 33. A transparent body 26 is fitted and fixed to a space part 36 formed in the holder 24. The holder 24 has a light emitting hole 38 and an observing hole 40 reaching the transparent body 26 from the outside in two positions having a determined interval. The top end part 42 of an optical fiber cable 28 is fitted to the light emitting hole 38. The optical fiber cable 28 is connected to a light source device 30 capable of supplying light thereto. An image pick-up camera 32 is arranged with the top end part being inserted to a space part 41 formed on the cover 33 in the position opposite to the observing hole 40, and this can photograph the inner part of the die 18 through the transparent body 26.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for detecting a kneading state of molten resin.

[0002]

2. Description of the Related Art As a conventional method and apparatus for detecting a kneading state of a molten resin, there is one disclosed in Japanese Patent Laid-Open No. 30927/1993. That is, the device disclosed in this publication has a cylinder portion, a screw rotatably arranged in the cylinder portion, a neck portion provided at the tip of the cylinder portion, a die portion provided at the tip of the neck portion, and a cylinder portion. In an extruder including a hopper provided and capable of supplying material thereto, a peephole is provided in a neck portion of the extruder. The observation window is provided with an image sensor and a light projecting device that allow observation of the inside of the neck portion from here. The image sensor is connected to an image processing device capable of image processing the observation result. In the detection method, first, the material is supplied from the hopper and the screw is rotationally driven, and the transparent resin is extruded forward while kneading. As a result, the transparent resin moves through the neck portion to the die portion. The transparent resin flowing through the neck portion is detected by the image sensor through the observation window, and the observation result is transmitted to the image processing apparatus, where the image processing is performed.

[0003]

However, in the conventional method and apparatus for detecting the kneading state of the molten resin, there is light reflected on the surface of the observation window among the light projected inside the neck portion. The image quality deteriorates due to. Also,
Since the inside of the neck portion is observed by the image sensor while projecting light by the light projecting device, the observation window becomes large. Therefore, the observation window is weak against the pressure of the transparent resin flowing in this portion. Further, because of the influence of heat generated by the extruder, it is necessary to provide a certain distance between the peep window and the image sensor, which lowers image accuracy. The present invention aims to solve the above problems.

[0004]

SUMMARY OF THE INVENTION The present invention solves the above problems by fitting the tip of an optical fiber cable into the light projecting port of a holder and supplying only the light projected from this into the die. . That is, the method for detecting the kneading state of the molten resin of the present invention is such that only the light from the tip of the optical fiber cable arranged at a predetermined position of the transparent body provided inside the die so that the light inside and outside the die passes through the die. Then, the state of the molten resin in this portion is observed only by the reflected light from the inside of the die. Further, the reflected light can be observed using a telescopic image pickup camera or a telephoto color measuring instrument.
Further, the molten resin kneading state detection device of the present invention is an extruder (1) having a die (18) at the tip of a cylinder (12).
0), a measurement window (23) fitted in a predetermined position of the die (18) and an optical fiber cable (2) capable of projecting light into the die (18) through the measurement window (23).
8), an imaging camera (32) capable of photographing the molten resin in the die (18) through the measurement window (23), and the measurement window (2
3) has a cover (33) which covers the upper side and has a bottom portion in contact with the upper surface of the measurement window (23),
The measurement window (23) is composed of a holder (24) fitted to the die (18) and a transparent body (26) mounted in the holder (24), and the holder (24) has a predetermined size. A light projecting port (38) and an observing port (40) reaching the transparent body (26) from the outside are formed at two positions, and the optical fiber cable (28) penetrates the cover (33) and is inserted therein. The optical fiber cable (24) is connected to the light source device (30) capable of supplying light thereto, and the image pickup camera (32). ) Has a tip (3) at a position facing the observation opening (40).
It is installed through 3). Further, a color measuring instrument may be provided instead of the image pickup camera (32). Further, the image pickup camera (32) or the color measuring instrument may be a telephoto type. In addition, the cover (3
A cooling device such as a heat exchanger or an air circulator may be provided in 3).

[0005]

The tip of the optical fiber cable is fitted to the light projecting port formed in the holder to project light into the die through the transparent body. With this, even if the light is reflected on the surface of the transparent body, the reflected light does not leak to the outside of the holder,
The light is reliably projected onto the surface of the molten resin in the die. Also, from the measurement window to the imaging camera is covered with a cover,
Since the observation is performed through the observation port formed at a position different from the light projecting port, the imaging camera can take an image only by the reflected light from the inside of the die without entering the light from the outside. This makes it possible to reliably observe the state of the molten resin. Further, by separately providing the light projecting port and the observation port, the area of each opening can be reduced. Further, by making the image pickup camera or the color measuring instrument of a telephoto type, these can be installed away from the observation port. Also, by providing a cooling device on the cover,
It is possible to prevent the influence of heat generation of the cylinder on the imaging camera or the color measuring instrument and the heat damage.

[0006]

EXAMPLE FIG. 1 shows the overall configuration of an extruder embodying the present invention. The extruder 10 includes a cylinder 12 and a cylinder 12
A screw 14 rotatably arranged in the cylinder 1
2 includes a hopper 16, a die 18 provided at the front end of the cylinder 12, and a drive device 20 capable of rotating the screw 14. The die 18 is provided with a measuring device 22. Measuring device 22
Is a measurement window 23 that is fitted through the die 18 in the radial direction, an optical fiber cable 28 that can transmit light through the transparent body 26 and project into the cylinder 12, and a light source device that can supply light to the optical fiber cable 28. 30 and cylinder 1
It is composed of an image pickup camera 32 capable of photographing the state inside 2 and a cover 33 covering from the image pickup camera 32 to the measurement window 23.

FIG. 2 shows a sectional view of the measuring device 22 portion.
The measurement window 23 is composed of a holder 24 and a transparent body 26. The holder 24 is fitted to the die 18, and the upper portion of the holder 24 in the drawing is covered with a cover 33 having a convex cross section. The bottom portion 35 of the cover 33 is fixed to the die 18 by the bolts 34 together with the upper portion 37 of the holder 24. A space 36 is formed inside the holder 24. The transparent body 26 is fitted in the space 36, and the outer diameter portion of the transparent body 26 and the inner diameter portion of the holder 24 are bonded to each other. A light projecting port 38 and an observing port 40 are provided at two positions which are spaced from the upper surface of the holder 24 by passing through the space 36 at predetermined intervals.
Is provided. A tip portion 42 of the optical fiber cable 28 inserted into the cover 33 is fitted into the light projecting port 38 through a through hole 39 provided in the side wall of the cover 33. A space 41 is formed at the upper end of the cover 33 at a position facing the observation port 40, penetrating the wall of the cover 33. The imaging camera 32 is installed at the upper end of the cover 33 by inserting the tip of the imaging camera 32 into the cover 33 from the space 41. As a result, the imaging camera 32 can take an image of the inside of the die 18 via the transparent body 26.

Next, the method for detecting the kneading state of the molten resin of this embodiment will be described. The material is supplied from the hopper 16 into the cylinder 12, and the screw 14 is rotationally driven by the drive device 20. The molten resin is kneaded by the screw 14 and moves toward the die 18. The optical fiber cable 28 is provided with a transparent member 26 from the tip portion 42 in which the light supplied from the light source device 30 is inserted into the light projecting port 38.
The light is projected to the inside of the die 18 via. Since the light is projected onto the molten resin passing through the transparent body 26, the state of the molten resin is
The image is taken by the image pickup camera 32 through the transparent body 26. Thereby, the kneading state of the molten resin is observed. Further, by using a color measuring device instead of the image pickup camera 32, it is possible to measure the color of the molten resin by the same method as described above. The imaging camera 32 (or color measuring device)
When the telephoto type is used, an effective image can be obtained, and since it can be placed away from the extruder 10,
It is also advantageous for the heat generation of the extruder 10. Further, a cooling device such as a heat exchanger or an air circulator may be attached to the cover 33. Although the measuring device 22 is provided in the die 18 in the above embodiment, the present invention is not limited to this, and may be provided in any position of the cylinder 12.

[0009]

According to the present invention, the tip end of the optical fiber cable is fitted to the light projecting port of the holder and the light is projected into the die, whereby the reflected light on the transparent body surface leaks to the outside of the holder. In addition, the measurement window to the imaging camera is covered with a cover, and observation is performed by the imaging camera through an observation port formed at a position different from the light projecting port of the holder. As a result, the kneaded state and color of the molten resin in the die can be observed without being affected by the reflected light on the transparent body surface and the light from the outside.
Moreover, by attaching the cover, it is possible to prevent dust and dirt from being mixed into the measurement window. This makes it possible to measure the molten resin state and color unevenness with high accuracy. Further, since the light projecting port and the observation port are provided separately, the opening area of each can be reduced. As a result, the light projecting port and the observation port become strong against the pressure of the molten resin passing through this portion. Moreover, since the imaging camera or the color measuring device is of a telephoto type, these can be installed away from the observation port, so that an accurate image can be obtained. Moreover, by providing the cover with the cooling device, it is possible to prevent the influence of the heat generation of the cylinder on the imaging camera or the color measuring instrument and the heat damage.

[Brief description of drawings]

FIG. 1 is a diagram showing an embodiment of the present invention.

FIG. 2 is a cross-sectional view of the measuring device portion of FIG.

[Explanation of symbols]

 10 Extruder 18 Die 23 Measuring Window 24 Holder 26 Transparent Body 28 Optical Fiber Cable 30 Light Source Device 32 Imaging Camera 33 Cover 38 Light Emitting Port 40 Observation Port 42 Tip

Claims (6)

[Claims] 1. A die is provided with only light from a tip of an optical fiber cable arranged at a predetermined position of a transparent body provided so that light inside and outside thereof is transmitted,
A method for detecting a kneading state of a molten resin, in which the state of the molten resin in this portion is observed only by reflected light from inside the die. 2. A method for detecting a kneading state of a molten resin, wherein the reflected light is observed by using a telephoto type imaging camera or a telephoto type color measuring instrument. 3. A die (18) at the tip of the cylinder (12).
In an extruder (10) having a measuring window (2) fitted in a predetermined position of a die (18).
3) and an optical fiber cable (28) capable of projecting light into the die (18) through the measurement window (23) and the molten resin in the die (18) through the measurement window (23) An image pickup camera (32) and a cover (33) which covers the upper side of the measurement window (23) and has a bottom portion in contact with the upper surface of the measurement window (23).
Is a holder (24) fitted to the die (18),
A transparent body (26) mounted in the holder (24),
The holder (24) is provided with two light emitting ports (3) that reach the transparent body (26) from the outside at two predetermined positions.
8) and the observation port (40) are formed, the optical fiber cable (28) penetrates the cover (33) and is inserted into the inside thereof, and the tip end (42) of the optical fiber cable (28) becomes the projection port (38). The optical fiber cable (24) is connected to a light source device (30) capable of supplying light to the optical fiber cable (24), and the imaging camera (32) has a tip (cover) at a position facing the observation opening (40). 33) A kneading state detecting device for the molten resin, which is installed so as to penetrate through. 4. A kneading state detection device for molten resin, which is provided with a color measuring device in place of the image pickup camera (32). 5. The kneading state detecting device for molten resin according to claim 3, wherein the image pickup camera (32) or the color measuring device is a telephoto type. 6. The kneading state detecting device for molten resin according to claim 3, 4 or 5, wherein the cover (33) is provided with a cooling device.