JPS5989119A - Detecting method of corresponding position - Google Patents

Abstract

PURPOSE:To manufacture a film of uniform thickness, etc. by putting a mark displaying a position in the width direction on the film, etc. extruded from the outlet of the die slit of a T-die, molding the film, automatically detecting the mark and accurately adjusting a slit clearance. CONSTITUTION:Plastics are melted, extruded from the T die 12 set up to an extruding machine 11 and changed into the sheet or the film 23, the marks 25 are put in the width direction on the sheet or the film 23 by a plurality of markers 13 mounted near the die slit of the T-die 12, and the sheet or the film is passed through molding rolls 14. Positions and thickness in the width direction and the states of the surfaces of the marks 25 put on the sheet or the film 23 are detected automatically by a scan type thickness meter 15, and detected data are memorized and analyzed by a signal converter 17, a central processing unit 18, a memory storage 19, etc. and fed back to the T-die 12, thus obtaining the sheet or the film of uniform thickness.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for automatically detecting the position of a molded sheet or film in the rlr direction corresponding to the position of the slit width of a T-die when manufacturing a plastic sheet or film. When molding glass or film using a T die, it is necessary to adjust the gap between the die slits to make the thickness uniform. Neck-in phenomenon between T-die and forming roll (sheet or)
When adjusting the gap of the T-die lift using the gou bolt based on the result of measuring the thickness of the sheet or film, it corresponds to the width direction of the sheet or film. Conventionally, it is impossible to know the exact position of the screw bolts, so it is conventional to divide the sheet or film width equally by the number of screw bolts, or to experimentally compare the die slit gap and the sheet or film thickness and position to the warehouse. The die slit gap has been adjusted appropriately based on the representative data obtained during the process, but this results in errors in the corresponding positions, and in extreme cases, results in even more uneven thickness. I couldn't make the correct adjustments. Since the ratio of neck-in broken is not constant due to differences in materials and operating conditions, it has become even more difficult to know the corresponding position.

The present invention has been made in view of the above-mentioned drawbacks, and includes markings indicating the position in the width direction on the sheet or film at the exit of the die slit, and automatically removing the marks made on the sheet or film after molding. Is it detected exactly and corresponds to the ij direction of the sheet t or film? The purpose of this invention is to provide a method for detecting the corresponding position that makes it possible to accurately know i¥.

An embodiment of the present invention will be described below with reference to the drawings.

This embodiment shows an apparatus according to the method of the present invention, which is further combined with the apparatus described later, and is capable of automatically performing calculations and die slit gap adjustment using a brograno. The extruder 11 that kneads and extrudes the melted polymer is equipped with a T-die I2 that spreads the molten polymer through a slit into a sheet or film-like flat plate and extrudes it, and uses multiple magic ink pens near the die slit of the T-die 12 as necessary. A marker 13 is provided to mark the width of the sheet or film. Next, a forming roll 14 takes and forms the sheet or film 23 extruded from the KT die I2, a scanning thickness gauge 15 detects the IJ force direction position, thickness and surface condition, and the formed sheet or Winders 16 and the like that continuously wind the film 23 are arranged in the order in which the sheet or film 23 flows. Furthermore, the scanning type thickness gauge 15 stores the data detected by the scanning type 11J thickness gauge 15 and according to the progela j.
A series of devices for calculating and feeding back to the T-die, namely a signal converter 17, medium heat % Jll yu,:
= Node (CPU) 1g, storage device fiJ19, etc. are connected. A pen recorder 2G is connected to record the thickness of the sheet or film: l'r, and the position in an analog manner. The central processing unit h (cp
u) +8VC is the same medium heat processing unit) (apu) +
External storage device 20 for storing the data processed in step 8
．． Cathode ray tube display (CRT) 2 for displaying the data
1 and a printer 22 for recording the same data are connected. Therefore, the silastic is melted by the extruder II.
a. After being kneaded, the mixture is fed under pressure into a T-die 12 and extruded from a die slit into a seal or film-like flat plate.

Using an inward magic ink pen as a marker, insert the extruded sheet or film 23 into the die bolt 24 (from A I to z+, 1ll) as shown in Figure 2.
Place mark 25 at the position. The sea) and tomb with the marks, and the bamboo film 23 are T-shaped.

- a neck-in phenomenon occurs between rl and rl contracts. Therefore, the die bolt positions provided at equal intervals, that is, marks made at equal intervals of four dimensions, are B, C, D, etc. on the position line detected by the scanning thickness gauge 15 for the four dimensions. becomes smaller. On this line, the scanning type thickness 1l15 (
When measured with an infrared thickness gauge) and recorded with the pen recorder 26, it becomes a chevron at the marked position as shown in Figure 3.
The thickness of the sheet or film 23 between the position ID and the chevron can be measured. If you do not add a dimension mark, you can also measure the thickness of the area corresponding to this chevron. Next, scanning thickness gauge 1
A signal converter 17 converts the die bolt position signal and thickness signal detected in step 5 into signals input to the next central processing unit (CPU) 18.
) 18 and a storage device 19, correction values are automatically calculated according to a preset program, and the results are fed back to the T-die to automatically adjust the gap between the die slits.

Furthermore, the data processed by the central processing unit (CPU) 18 is stored in an external storage device 20, and the stored data can be recalled and used as needed during subsequent visits.

In addition, the data is displayed on a cathode ray tube display (CRT) 21
The information can be displayed on the spot or printed using the printer 22. The sheet or film 23 that has passed through the scanning thickness gauge 15 is processed by trimming and other processing equipment (
(not shown) is completely wound up by a winding machine 16.

In this example, a magic ink pen was used as a marker to indicate the die bolt position, and an infrared thickness gauge was used as a scanning thickness gauge. It is also possible to detect the mark using a photoelectric switch or the like on the thickness gauge.

1υ,] 2 to 2);
2. 1. Sealing corresponds to the width direction of the film/It has the effect of knowing the position of the die slit and quickly adjusting the gap between the die slits.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram showing one embodiment of the present invention. FIG. 2 is a diagram showing the T-die slit exit position and the position in the width direction of the film after neck-in. Figure 3 is a diagram showing the positions of two marks made on a sheet or film detected by an infrared thickness gauge and recorded by a pen recorder. II ・Extruder, 12・・T die, 13
... Marker, +4... Molding D -/l/, 15...
・Scanning thickness gauge, 16... Winder, 23... Sheet material or film. Applicant: Toshiba Machine Co., Ltd. 71゛ Engraving of drawings (no changes in content): A71 item 2/v73 National procedure amendment @ (method) March f7, 1988 1 Indication of case 1988 Patent Application No. 199883 2. Title of the invention Corresponding position detection method 3 Relationship with the case of the person making the amendment Postal code of the patent applicant 104

Claims (1)

[Claims] In the manufacturing process of plastic sheets or films using extruders, T-dies, forming rolls, etc., a mark indicating the width direction position is placed on the note or film at the exit of the die slit, and the mark is placed on the sheet folding or film after forming. A method for detecting a corresponding position, characterized in that the mark is automatically detected.