JPH01321301A - Sheet thickness measuring method and apparatus - Google Patents

Abstract

PURPOSE:To continuously measure the thickness of a sheet by bringing a reference body and an end of a measuring element of a distance measuring device into contact with one surface of said sheet and the other surface thereof respectively, thereby to measure the distance between said end of measuring element and the surface of said reference body. CONSTITUTION:An extruder 2 is used as a manufacturing device of a sheet 6. A film of the sheet 6 is continuously extruded out of a die 4, through cooling rolls 8, 10 and a feed roll 12, to be wound by a take-up roll 14. A measuring device 20 is mounted between the rolls 10 and 12, which is comprised of a reference roll 22 is contact with one surface of the sheet 6 and a dial gauge 26 confronting to the roll 22 and in contact with the other surface of the sheet 6. The dial gauge enables continuous measurement of the distance between the sheet 6 and the surface of the roll 22. Therefore, by reading a scale plate of the dial gauge 26, the thickness of the sheet 6 can be continuously detected.

Description

Detailed Description of the Invention The present invention provides a measuring method for continuously measuring the thickness of a film or sheet formed by extrusion molding or the like and continuously fed out in the longitudinal direction, and a measuring device used therefor. Regarding.

An extrusion molding method is known as a method for producing a U film or sheet (herein collectively referred to as a "sheet") whose weight per day is 1 ton. When manufacturing a sheet by extrusion molding, for example, as shown in FIG. The sheet 6 wound on the winding roll 14 is moved in the direction so as to be continuously wound on the winding roll 14.
The sheet is then subjected to secondary processing or shipped as a product, but in either case, the sheet must have a certain thickness.

However, due to the operating conditions of the extrusion 11!2 or changes in the environmental temperature, the film thickness of the sheet 6 after being cooled by the cooling roll 8.10 may change slightly and deviate from the film thickness range that is allowable as a product. There is. Therefore, conventionally, the operation of the winding roll 14 is stopped at predetermined intervals, the operator cuts and pulls out the sheet 6 at the position 16 just before the winding roll 14, and the film thickness of this sheet 6 is measured using a hand-held machine. Check the film thickness of the sheet 6 by measuring it with a dial gauge, and if the film thickness exceeds the predetermined tolerance range,
The molding conditions of the extruder 2, etc. were adjusted.

However, in the conventional method of manually checking the film thickness of the sheet 6 and adjusting the molding conditions of the extruder 2, etc., the adjustment takes time, and during this time a large number of defective sheets are produced. The problem was that it was molded into a

The present invention was made in order to solve the problems of the conventional technology, and it is possible to continuously measure the film thickness of a sheet without stopping the sheet manufacturing equipment. The first object of the present invention is to provide a method for measuring the film thickness of a sheet, which is easy to perform and can minimize the occurrence of defective sheets.

A second object of the present invention is to provide a measuring device that can be used directly when carrying out the above film thickness measuring method.

4th edition'' ■ In order to achieve the first object described above, the sheet film thickness measuring method according to the present invention brings a reference body into contact with one surface of a sheet that moves continuously in the longitudinal direction, and measures the thickness of the sheet. The film thickness of the sheet is continuously measured by bringing the tip of a distance measuring device into contact with the other surface and continuously measuring the distance between the tip of the measuring tip and the surface of the reference body. It is said that

Further, in order to achieve the second object, the measuring device according to the present invention includes a reference body that comes into contact with one surface of a sheet that moves continuously in the longitudinal direction, and a reference body that abuts on one surface of the sheet that moves continuously in the longitudinal direction, and the other side of the sheet that faces the reference body. It is characterized by comprising a spatially fixed distance measuring device having a measuring tip tip that comes into contact with the surface of the distance measuring device.

According to the sheet film thickness measuring method and measuring device according to the present invention, the distance between the tip of the probe and the reference wood surface can be continuously measured without stopping the winding machine as the sheet manufacturing device. By measuring, it becomes possible to continuously measure the film thickness of the sheet. Therefore, the worker
By regularly monitoring the distance measuring device, it is possible to check whether the film thickness of the sheet is within a predetermined tolerance. In addition, if the film thickness of the sheet exceeds a predetermined allowable range, it is extremely easy to adjust the molding conditions of the extruder, etc., which is the sheet manufacturing equipment, while watching the distance measuring device. At the same time, the occurrence of defective sheets can be minimized. Therefore, it also contributes to reducing sheet manufacturing costs.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below based on embodiments shown in the drawings.

FIG. 1 is a schematic diagram, not showing a method for measuring the film thickness of a sheet, according to an embodiment of the present invention, and FIG. Common members are given the same reference numerals.

In the embodiment of the present invention shown in FIG. 1, an extruder 2 is used as a manufacturing device for the sheet 6, and a film-like sheet 6 is continuously extruded from a die 4 and passed through a cooling roll 8, 10 and a feed roll 12. Then, it is wound up by a winding device 14.

The measuring method according to the present invention is carried out in order to continuously measure the film thickness of the sheet 6 while the sheet 6 is continuously moved in the longitudinal direction. In the embodiment shown in FIG. 1, a measuring device 20 according to the present invention is installed between a cooling roll 10 and a feed roll 12. In the example, sheet 6
The dial gauge 26 is comprised of a reference roll 22 as a reference body that comes into contact with one surface of the sheet 6, and a dial gauge 26 that serves as a distance measuring device and has a measuring tip 24 that comes into contact with the other surface of the sheet 6 facing the reference roll 22.

The reference roll 22 preferably rotates along the traveling direction A of the sheet 6, but does not necessarily need to rotate.

If the reference roll 22 does not rotate, this roll 22
It is preferable that the surface of the roll 22 is useful for sliding against the sheet 6. Also, the reference body is not limited to the cylindrical reference roll 22 shown in the figure, but may have another column shape or a flat plate shape. It's okay.

A roller 28 is attached to the tip of a measuring stylus 24 of a dial gauge 26 serving as a distance measuring device, and is configured to rotate as the sheet 6 advances. dial gauge 2
6 is fixed in space by a fixed piece 30 and a fixed rod 32 so that the distance between the tip of the measuring stylus 24 and the surface of the reference roll 22 can be continuously measured.6 The operator uses this dial gauge. By looking at the display section 26a of 26, the film thickness of the sheet 6 can be known.

It is preferable that such dial gauges 26 are installed at a plurality of locations on a fixed rod 32 extending substantially perpendicular to the traveling direction A of the sheet 6, and measure the film thickness of the sheet 6 at a plurality of locations. Moreover, it is preferable that the fixing piece 30 is attached to the fixing rod 32 so as to be movable along the axial direction of the fixing rod 32.

The mounting position of such a measuring device 20 is not particularly limited, but it is preferably as close to the cooling roll 10 as possible, in order to minimize the formation of defective sheets 6. However, since the sheet 6 may not be sufficiently cooled near the cooling roll 10, the sheet 6
Care must be taken not to scratch the surface.

Note that the present invention is not limited to the illustrated embodiments described above, and various modifications can be made within the scope of the present invention.

For example, the distance measuring device is not limited to the dial gauge 26, but may be any other conventionally known distance measuring device.For example, an electric circuit may be connected to the distance measuring device,
If the film thickness measured by the distance measuring device is outside the allowable range, a buzzer may sound or a light may be turned on.Furthermore, an automatic control circuit may be connected to ensure that the film thickness is within the allowable range. If the value is outside the range, the molding conditions of an extruder or the like as a sheet manufacturing device may be automatically controlled.

Furthermore, according to the present invention, it can be used not only to measure the film thickness of a sheet when manufacturing the sheet using an extruder, but also to measure the film thickness of a sheet when the sheet is continuously moved in the longitudinal direction. Can be applied. In addition, as mentioned above, the "sheet" used in the present invention
This is a broad concept that includes films, plates, steel materials, etc.

As explained above, according to the sheet film thickness measuring method and measuring device according to the present invention, the tip of the measuring stylus and the standard can be easily connected to each other without stopping the winding machine or the like as the sheet manufacturing device. By continuously measuring the distance to the body surface, it becomes possible to continuously measure the film thickness of the sheet. Therefore, the operator can check whether the film thickness of the sheet is within a predetermined tolerance range by periodically monitoring the distance measuring device or the like. In addition, if the film thickness of the sheet exceeds a predetermined allowable range, adjust the molding conditions of the extruder, etc. as the sheet manufacturing equipment, while checking the distance measuring device or automatically using the automatic control device. Therefore, the adjustment is extremely easy and the occurrence of defective sheets can be minimized. Therefore, it also contributes to reducing sheet manufacturing costs.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram showing a sheet film thickness measuring method according to an embodiment of the present invention, FIG. 2 is a perspective view of a main part of a measuring device according to the same embodiment, and FIG. 3 is a diagram illustrating a conventional example. FIG. 3 is a schematic diagram showing a method for measuring the film thickness of a sheet. 6... Sheet 20... Measuring device 22...
Standard roll 26...Dial gauge agent Patent attorney Shunichi Suzuki District 1 Ward 2 Figure 22 A Figure 3

Claims (1)

[Claims] 1) A reference body is brought into contact with one surface of a sheet that moves continuously in the longitudinal direction, and the tip of a measuring point of a distance measuring device is brought into contact with the other surface of the sheet. A method for measuring the film thickness of a sheet, characterized in that the film thickness of the sheet is continuously measured by continuously measuring the distance between the tip and the surface of the reference body. 2) A reference body that comes into contact with one surface of a sheet that moves continuously in the longitudinal direction, and a probe tip that comes into contact with the other surface of the sheet that faces this reference body, and has a spatially fixed distance. A measuring device consisting of a measuring device. 3) The measuring device according to claim 2, wherein the distance measuring device is a dial gauge.