JPS6143103B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION It is widely known that tape-like or sheet-like products coated with resin on one side can be used for magnetic tapes, adhesive tapes, and the like. As a coating device, a part of the side wall of a cylinder as shown in attached FIGS. 1 and 2 is cut off to form a coating nozzle, a fixed amount of resin liquid is sent to this nozzle, and a tape-shaped, A sheet-like material was applied, and a rubber back-up roll was applied from the top of the nozzle to apply pressure to the upper part of the nozzle through the sheet-like material, so that the desired thickness of resin liquid was applied to one side of the sheet-like material. something is known. At this time, the gap accuracy between the back-up roll and the nozzle determines the coating accuracy, and if this gap is uneven, the coating thickness will be uneven in thickness and thinness, making it impossible to obtain a coating layer with high thickness accuracy. do not have.

In the above-mentioned coating equipment that is generally used, a method is adopted in which the rubber hardness, roundness, cylindricity, and nozzle surface smoothness of the back-up roll are determined according to the desired product thickness. It is necessary to accurately ensure parallelism between the plane of the plane and the back-up roll axis.

For this reason, the amount of pressure applied to the left and right sides of the roll shaft was changed empirically, the basis weight of the product was checked, and the amount of pressure applied was determined through trials to determine the appropriate amount of pressure for the product basis weight. Therefore, the time required for this work is excessive, and when obtaining a coating layer with thermosetting resin,
This is unsuitable in terms of workability and product yield, as it has the inconvenience of hardening in the pipes during the suspension period of resin transfer required for adjusting the amount of pressure, and the resin cannot be reused, resulting in poor yield. It was hot.

In addition, since it is not possible to check changes in the shaft position that occur during operation, no countermeasures can be taken even if the coating weight distribution of the coating liquid changes, which is an extremely difficult problem in terms of quality control and the ability to obtain highly accurate coating conditions. This was extremely difficult.

The object of the present invention is to improve this defect by using a simple device and operation.

An example of a coating method using the coating apparatus of the present invention will be outlined with reference to FIGS. 1 and 2.

The tape 14 unwound from the unwinding frame 1 passes through guide rolls 2 and 3, constant tension devices 4 and 5, reaches above the opening of the nozzle 6, and is pressurized from the back side of the tape 14 by a back-up roll 7. As shown in FIG. 2, the coating liquid 15 is applied onto the tape, passed through guide rolls 8 and 9, and take-up devices 10 and 11, and covered with a hollowing material 13 between 10 and 11 to take up the winding frame 1.
It is designed to be rolled up from 2. 21 is a resin storage container, 20 is a metering pump, and 22 is a pipe. FIG. 3 is a front view of the device of the present invention when it is operated normally, FIG. 4 is a side view thereof, and FIGS. 5 and 6 are views of the device of the present invention that is not operated normally. FIG. Third
18 in Figures to Figures 6 is the back-up roll axis, 17
is a self-aligning bearing, 16 is a dial gauge or differential transformer, 19 is a weight, 23 is a support bearing, 2
4 is a support rod.

When using such a device, for example, in the device of the present invention, if the left and right balance of the load 19 is lost, the parallelism between the roll axis and the nozzle top surface will be lost, as shown in FIGS. 5 and 6, and the tape will be damaged. This often results in uneven thickness of the coating liquid formed on the surface of the nozzle, and when the nozzle is removed and reset, the parallelism between the back-up roll and the nozzle is lost, resulting in uneven thickness of the coating liquid.

The present invention makes it possible to easily correct thickness unevenness caused by back-up roll or nozzle reset adjustment, thereby improving workability and product yield, and also to correct unevenness caused by roller axis fluctuation during operation. The aim is to prevent the occurrence of this problem and obtain a coating layer with high precision.

The gist of the present invention is to make the bearing of the back-up roll shaft self-aligning, to make it possible to easily move up and down the left and right sides of the roll shaft independently, and to install a device that can measure the vertical movement of both ends of the roll shaft around both ends of the roll shaft. In order to easily and accurately move both ends of the roll shaft up and down, it is possible to apply a concentrated load using weights around both ends of the roll shaft, thereby easily preventing uneven thickness of the coating liquid. This is a resin coating device characterized by being able to minimize the amount of resin applied.

The present invention will be explained with reference to FIGS. 3, 4, 5, and 6 of embodiments.

As mentioned above, in these figures, 6 is a metal hollow nozzle, 14 is a tape-like material, and 7 is a back-up roll that applies pressure from the back of the sheet.
is the coating liquid. Axis 18 of Backup Prowl 7
is held by a self-aligning bearing 17. This bearing is supported by a support rod 24 with 23 as a fulcrum,
The weight 19 and its position on the support rod determine the load level of the back-up roll 7 on the nozzle 6 opening and the vertical position of the shaft 18, which can be directly or amplified as shown in FIG.
It is constructed so that it can be measured using measuring devices such as dial gauges and differential transformers.

To use these, first apply a constant load on the left and right sides to a fixed position and start operation. Assuming that the thickness unevenness of the coating liquid is as shown in Figure 5, read the thickness unevenness and dial gauge at this time, and then apply additional load on the right side or reduce it on the left side to create the condition as shown in Figure 6. At this point, read the thickness unevenness and dial gauge. Based on these correlations, the right and left positions of the dial gauge can be determined and the load balanced accordingly. By this operation, a coating layer with an appropriate thickness distribution as shown in FIG. 3 can be easily obtained.
Another advantage of the present invention is that even if unevenness occurs in the distribution of the coating liquid due to some factor that impedes parallelism during operation, this can be easily measured as a change in the roller axis position. It becomes possible to readjust the roll axis position to an appropriate position, and it becomes possible to always maintain highly accurate distribution of the coating liquid.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram of the coating apparatus of the present invention. FIG. 2 is a side view of the relative relationship among the backup roll, tape-like sheet material, and nozzle shown in FIG. 1. FIG. 3 is a front view of the backup roll section according to the present invention, and FIG. 4 is a side view of the backup roll section according to the present invention. FIGS. 5 and 6 show a state in which the back-up roll axis is tilted with respect to the nozzle surface, resulting in uneven thickness of the coating layer. However, Figures 5 and 6 have been slightly exaggerated to aid mutual understanding.

Claims (1)

[Claims] 1. The bearings of the rolls of the back-up roll are self-aligning, and devices capable of measuring the vertical movement of both ends of the roll shaft are installed around both ends of the roll shaft, and weights are installed around both ends of the roll shaft. A resin coating device characterized in that a resin coating device is provided near a concentrated load loading device and a back-up roll. 2. The coating device according to claim 1, wherein a dial gauge or a differential transformer is provided as a device capable of measuring the vertical movement of both ends of the roll shaft. 3. The coating device according to claim 1, wherein a thermosetting resin is used as the resin.