JPH04239623A - Color monitoring method and device in screw extruding machine - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention]

0001

[Industrial Application Field] The present invention relates to a color monitoring method and apparatus for a screw extruder, and in particular, by comparing the color of a finished compound in an unmolten state and a standard compound, a finished compound with a small color difference can be easily obtained. Concerning new improvements for.

0002

BACKGROUND OF THE INVENTION As a typical color monitoring method and apparatus for screw extruders of this type that have been used in the past, there is a structure disclosed in Japanese Patent Publication No. 2-1648. That is, the color density of the finished compound is detected regularly at short time intervals by a spectrometer connected via a sensor at the outlet end of the screw extruder and compared with the target value of the color density of the standard compound in an evaluation device. In this method, the color values of the finished compound in the molten state and the standard compound in the dry state were detected, and the difference was used to adjust the supply of each material to the screw extruder.

0003

[Problems to be Solved by the Invention] Since the conventional color monitoring method and device for a screw extruder were constructed as described above, the following problems existed. That is,
The finished compound is in a molten state, while the standard compound is in a solid dry state, so there is a large temperature difference between each compound, which makes it difficult to compare and inspect color deviations with high precision. I couldn't do it.

[0004] For example, the above-mentioned compounds are compared as follows. Molten state (
(at high temperature) Solid state (at room temperature) Color difference
Sample L*a
*b* L* a*
b* △E*ab GPPS general purpose polystyrene 75.0 0.6 0
．． 6 78.2 -1.1 0.7
3.6PC Polycarbonate
62.2 2.4 -0.7 56
．． 2 1.1 -1.2 6.2PP hollyhin 59.2
0.2 6.4 49.7 0
．． 0 -3.1 13.4PP+Red (Master Hatch) 36.9 21.2
9.2 45.7 20.1 7.
8 9.0PP+Blue (Master Hatch)
29.0 6.1 -14.3 40
．． 1 2.8 -7.1 13.6
However, the L*, a*, and b* values of each sample are the average values of three measurements. Also, the color difference △E*ab is as follows: △E*ab=[(△L*)2+(△a*)2+(△b*
)2]1/2, where ΔL*, Δa*, and Δb* indicate the difference between the molten state and solid state. Furthermore, the numerical value and degree of the color difference ΔE*ab are as follows. Evaluation of degree of color difference △E*ab
(Color difference value) Very slightly different 0 to 0
．． 5 Slightly different 0.
5 to 1.5 appreciably different 1.
5-3.0 significantly different
3.0-6.0 very significantly different
6.0-12.0 will be a different color system
12.0 or more Therefore, each color difference ΔE*a mentioned above
b is 3.6 when it is small and 13.6 when it is large,
The color difference between the finished compound in the molten state is extremely large, and based on this color difference, it is necessary to control the metering and feeding device that supplies the various materials. It was extremely difficult to match the color of the standard compound.

The present invention has been made to solve the above-mentioned problems. In particular, by comparing the colors of a finished compound in an unmolten state and a standard compound, it is possible to easily obtain a finished compound with little color difference. It is an object of the present invention to provide a color monitoring method and device for a screw extruder.

[0006]

[Means for Solving the Problems] A color monitoring method for a screw extruder according to the present invention compares the color values of a standard compound and a finished compound in a non-molten state extruded from a screw extruder based on the compound blending ratio. In this method, the color of the completed compound is monitored based on the magnitude of the absolute value of the difference.

More specifically, the method is such that the color of the completed compound is measured through a color measurement window provided in a pipe through which the completed compound passes.

Another invention is a color monitoring device for a screw extruder, which measures the color values of a standard compound and a finished compound extruded from a screw extruder. a dryer for drying the finished compound that has been finely divided by the cutter and has moisture; and a finishing measuring device for measuring the finished compound in a dry state sent from the dryer. The device is configured to include a standard measuring device provided in a case for measuring the standard compound in a dry state, and a monitoring device for monitoring colorimetric signals from each of the colorimetric devices.

More specifically, the monitor is provided with a plurality of indicators each having a different color.

0010

[Operation] In the method and device for color monitoring of a screw extruder according to the present invention, the color values of the finished compound, which is in a non-molten state after being extruded by the screw extruder, and the standard compound are compared. can be compared with the finished compound under exactly the same conditions. Therefore, there is very little temperature difference between each compound, and color difference measurement with almost no measurement error allows
It is possible to obtain a finished compound whose color is equivalent to that of the standard compound.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the color monitoring method and apparatus for a screw extruder according to the present invention will be described in detail below with reference to the drawings. 1 to 5 are for illustrating a color monitoring method and device for a screw extruder according to the present invention, in which FIG. 1 is a block diagram showing the overall configuration, FIG. 2 is an enlarged sectional view of the main part of FIG. 1, 3 is an enlarged sectional view of the main part of FIG. 1, FIG. 4 is a block diagram, and FIG. 5 is a flow chart. 1 in Figure 1
1 is a screw extruder having a first hopper 2, and an extrusion screw (not shown) provided in a cylinder 3 of this screw extruder 1 is connected to a drive device 1.
It is configured to be driven by A. The cylinder 3 includes a plurality of heaters 4, 5, 6, 7, 8, 9, 10.
, 11 and second and third hoppers 12 and 13 are arranged in series, and a breaker plate 14, a die 15, and a cutter device 16 are provided in series at the tip of the extruder 1.

At a position above the first hopper 2, there are a plurality of metering and feeding devices 31 and 32 that measure and supply various materials and color raw materials for forming the compound raw material 35a.
, 33 and 34 is located therein, and a multi-component compound raw material 35a is supplied into the first hopper 2 from this multi-component mixer 35.

As is well known, the cutter device 16 includes:
It has a cutter blade (not shown) installed in hot water of about 80°C (actually in the range of about 40°C to 120°C), and a dewatering screen 4 is located downstream of the cutter device 16.
A dryer 41 of a centrifugal type or the like having an integrated pipe 5 and a pipe 44 is disposed, and the finished compound in the form of fine pellets in a state of being cut with the cutter device 16 and having moisture is placed in this dewatering screen 45. 204 is configured to be supplied. Outlet 44a of the pipe 44
A completion colorimetric window 42 is provided near the pipe 44 to measure the color of the completed compound 204 passing through the pipe 44, and the first optical fiber 43 provided in the completion colorimetric window 42 is It is connected to a monitor 61. Further, the second optical fiber 53 connected to the monitor 61 is connected to a case 51 containing a standard compound 304 serving as a color reference.
It is connected to the standard color measurement window 52 of.

The monitor 61 is configured as shown in FIG.
05 and the standard color measurement signal 409 are inputted to the controller 4.
01 and display signals 411, 41 from the controller 401.
3, 415 and 417 are applied to the green indicator 410
, a blue display 412, a yellow display 414, and a red display 416. The first and second optical fibers 43 and 53 are connected to the completion colorimetric window 42 and the standard colorimetric window 52 in a merged single fiber configuration, and are connected to each of the colorimeter 402 and 406 are connected to each other in a two-piece configuration consisting of light emitting optical fibers 403 and 407 and light receiving optical fibers 404 and 408.

The completion colorimetric window 42 provided in the pipe 44 through which the granular finished compound 204 flows is constructed as shown in FIG.
is attached via a glass 201 with bolts 203, and the first optical fiber 43 is directly connected to this glass 201. Further, the standard colorimetric window 52 provided in the case 51 containing the granular standard compound 304 is configured as shown in FIG. 301 and this glass 3
The second optical fiber 53 is directly connected to 01.

Next, a color monitoring method for a screw extruder according to the present invention in the above-described configuration will be explained with reference to the flowchart shown in FIG. First, in a first step 501 in FIG. 5, after the completion of the previous monitoring operation, a wait is performed until the start of the current monitoring operation. In the second step 502, the color values (L*, a*, b*) of the standard compound 304 in the case 51 are read with the standard colorimeter 406, and S
Let them be L*, Sa*, and Sb*. In a third step 503, the color value (
L*, a*, b*) with the completion colorimeter 402, and PL
*, Pa*, Pb*. In a fourth step 504, the color difference between each color value of each compound 204, 304 is calculated. The formula for calculating the color difference △Eab* is the same as in the conventional example described above, △Eab*=[(△L*)2+(△
a*)2+(△b*)2]1/2. In a fifth step 505, the magnitude of the color difference ΔE*ab is determined, and if it is less than 0.3, a green display is performed in a sixth step 506. In addition, if the value is 0.3 or more and less than 0.5, a blue display is performed as a seventh step 507, and 0.5 or more is 1.0.
If it is less than 500, the eighth step 508 is to display the image in yellow. By repeating the above operations, it is possible to continuously monitor the color of the finished compound 204 flowing within the pipe 44. Furthermore, if it is 1.0 or more,
As a ninth step 509, a red display is performed. The color difference ΔE*ab described above is similar to the configuration shown in the explanation of the conventional example, and raw materials, pigments, etc. are fed by the metering and feeding devices 31 to 34 shown in FIG. control the distribution of

[0017]

[Effects of the Invention] Since the color monitoring method and device for a screw extruder according to the present invention are configured as described above,
The following effects can be obtained. In other words, because the finished compound for color measurement is continuously flowing in a dry state, it is possible to measure the finished compound in the dry state, which is the same undissolved state as the standard compound, and it is different from the conventional completed compound in the molten state. Compared to methods using compounds, the measurement accuracy is significantly improved, and it is possible to obtain finished compounds with highly accurate color matching.

[Brief explanation of the drawing]

FIG. 1 is an overall configuration diagram showing a color monitoring method and apparatus for a screw extruder according to the present invention.

FIG. 2 is an enlarged sectional view of the main part of FIG. 1;

FIG. 3 is an enlarged sectional view of the main part of FIG. 1;

FIG. 4 is a detailed block diagram of the monitor of FIG. 1;

FIG. 5 is a flowchart showing a monitoring state.

[Explanation of symbols]

1 Screw extruder 16 Cutter 41 Dryer 42 Complete color measurement window 44 Pipe 51 case 204 Completed compound 304 Standard compound 402 Completion colorimeter 406 Standard colorimeter 410 Display 412 Display 414 Display 416 Display 411 Colorimetric signal 413 Colorimetric signal 415 Colorimetric signal 417 Colorimetric signal

Claims (4)

[Claims] 1. Compare the color values of the standard compound (304) and the finished compound (204) in a non-molten state extruded from the screw extruder (1), and determine the color value of the finished compound according to the magnitude of the absolute value of the difference. (204) A method for monitoring the color of a screw extruder, characterized in that the color of the screw extruder is monitored. 2. The finished compound (204) comprises:
A pipe (4) through which the finished compound (204) passes
4) The color monitoring method for a screw extruder according to claim 1, wherein the color is measured from a completion color measurement window (42) provided in step 4). 3. Standard compound (304) and finished compound (2) extruded from the screw extruder (1).
04) A color monitoring device for a screw extruder configured to measure the color value of a cutter device (16) provided in the screw extruder (1),
a dryer (41) for drying the finished compound (204) that has been finely divided and has moisture in step 16); and a dryer (41) for measuring the finished compound (204) in a dry state sent from the dryer (41). Completion colorimeter (40
2), a standard colorimeter (406) provided in the case (51) for measuring the standard compound (304) in a dry state, and measurement from each colorimeter (402, 406). A color monitoring device for a screw extruder, comprising a monitor (61) for monitoring color signals (411, 413, 415, 417). 4. The monitor (61) includes a plurality of indicators (410, 412, 414, 416) each having a different color.
is provided, and the colorimetric signals (411, 413, 4
Color monitoring for a screw extruder according to claim 1, characterized in that each of the indicators (410, 412, 414, 416) is selectively turned on in accordance with the color difference obtained by the method (15, 417). Device.