JPS6222325Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a glue spreader for applying adhesive to both the front and back sides of a veneer, which is a raw material for plywood products, in a synthetic manufacturing factory.

The plywood production process at a plywood factory is to dry a long sheet-shaped veneer obtained by turning raw wood to a predetermined moisture content using a drying device, then use a cutting device to
For example, the plywood is cut into pieces of 3 x 6 shaku, etc., then it is sorted into the relatively thin front and back veneers that will appear on the surface of the plywood product, and the relatively thick middle veneer that will go inside the plywood product, and then glued. The adhesive is applied to both the front and back sides of the thicker medium veneer using a spreader.

After applying adhesive, the front and back veneers that will become the surface of the plywood product are superimposed, and then a new glued middle veneer is layered on top of that, and then the front and back veneers are layered again. The veneers are sequentially glued and polymerized, and eventually piled up to a predetermined height. They are put into a cold press and temporarily pressed (temporarily bonded) at a constant pressure, and then released after a predetermined amount of time. It will be done.

The semi-finished plywood product is temporarily bonded into three layers of front veneer, middle veneer, and back veneer by cold pressing, and each temporarily bonded veneer is sequentially sent between the hot plates of a hot press and heat-pressed. The plywood is completely adhered. After completing the heat pressing, the semi-finished plywood product is then sawed into finished products of uniform vertical and horizontal dimensions with the four corners at right angles, and then undergoes a surface polishing process using a sander or the like to complete the plywood product.

The present invention attempts to eliminate the defects of the glue spreader, which simultaneously applies glue to both the front and back sides of a veneer such as an intermediate board using rolls, in the above-mentioned process.

Conventionally, in order to store glue on the outer circumferential surface of a glue spreader, a roll coated with an elastic material such as rubber and having a large number of thin grooves is used. Glue rolls 3 and 3' are arranged vertically facing each other. Furthermore, doctor rolls 4 and 4' for controlling the amount of adhesive applied to the outer circumferential surface of the glue roll are respectively provided before and after the glue roll, and are driven to rotate in the directions of arrows G, G', D, and D', respectively.

On the other hand, the adhesive is filled into the valley formed by the upper outer peripheral surfaces of the glue roll and doctor roll.
It is stored. Therefore, the outer circumferential surfaces of the glue rolls arranged vertically are rotated in the directions of arrows G and G' with the regulated adhesive being evenly applied by the outer circumferential surface of the doctor rolls arranged close to each other. The adhesive is applied to both the front and back surfaces of the board by passing between glue rolls that are placed opposite each other.

Normally, the workers who work on the glue spreader are assigned to the veneer insertion side and the veneer receiving side, and each person sends and receives the veneer while standing, but the problem here is: The problem is to check whether the adhesive has been evenly applied to the entire front and back of the veneer after passing through the spreader.

It is sufficient for the receiving worker to visually check the top surface of the veneer, but the back surface cannot be checked. If you had to lift the veneer diagonally and check the back side of the veneer that was sent to you, it would not be possible to process the veneer that is being fed almost continuously at a speed of around 100 m/min. The only thing I could do was to quickly replenish the adhesive while watching from a distance how much adhesive had filled up between the glue roll and the doctor roll on the lower side.

From the above, for example, the replenishment of adhesive may be delayed, or the squeezing of the doctor roll may be too effective.
Due to other unforeseen circumstances, such as when the adhesive is not applied partially to the back of the veneer, it is only after the hot pressing process is completed that the adhesive is not fully applied to the back of the veneer, and the first time we are told about a puncture or poor adhesion. These defective products cannot be recycled and can only be used as fuel, but due to the corrosive gas generated when the adhesive is burned, even that is avoided, resulting in extremely disadvantageous results. be.

The present invention eliminates these obstacles,
An embodiment will be described below with reference to the drawings. The figure is an overall side view of one embodiment of the present invention, in which 1 is a glue spreader, and glue rolls 3, 3' are attached to the left and right machine frames 2.
are supported vertically facing each other. 4 and 4' are doctor rolls, which have a smaller diameter than the glue roll and have a smooth outer peripheral surface, and are pivoted so that they can approach and separate from the upper and lower glue rolls, respectively, as indicated by arrows G, G',
It is rotationally driven in the D and D' directions.

Reference numeral 6 denotes an adhesive supply pipe, which supplies adhesive between the rolls by opening and closing a valve as necessary. Reference numerals 8 and 8' indicate adjustment handles for controlling the amount of glue applied to the veneer by adjusting the degree of approach of the doctor roll to the glue roll.

Reference numeral 11 denotes an exit table provided on the veneer delivery side of the spretzer, and in the illustrated embodiment, the side surface is configured in a U-shape, and the thin veneer F for the front and back side is inserted into the inner pocket of the table through a lift 21. It is stored. A plurality of transfer disks 12 in the form of star-shaped disks or thin disks are rotatably supported on the upper surface of the exit table, and the upper end of the disks 12 is connected to the veneer transfer surface R of the spreader 1.
They are arranged so that they are at approximately the same height or slightly lower than that.

Reference numeral 15 denotes an adhesive detection member, which detects high moisture content by contacting or not contacting the back side of the veneer P carried out from the spreader, and outputting the presence or absence of moisture on the back side of the veneer P as an electric signal, or outputting the amount of moisture on the back side of the veneer P. A container etc. is used. Therefore, the detection member 15 is installed near the unloading side of the veneer transport path of the glue spreader 1. Further, it is best to arrange a plurality of detection members linearly in a direction perpendicular to the veneer conveyance direction indicated by arrow A. It should be noted that even if the detection member is simplified and only one detection member is placed approximately in the center of the width of the single plate, a corresponding effect can be obtained.

There are various adhesives used for bonding wood veneers together in plywood manufacturing, but they all account for 70% to 90% of the adhesive.
is water. Therefore, adhesive detection can be replaced with moisture detection.

16 is a control device. The control device 16 receives a detection signal from the detection member 15 indicating the moisture condition on the back side of the veneer to be carried out by the spreader, and when there is no moisture or a small amount of moisture, the control device 16 outputs an alarm signal to an alarm device S, which will be described later, and is activated. In addition to transmitting a signal to the alarm device, a method of outputting a stop signal to the roll drive motor 7 of the spreader may also be used, if necessary.

The alarm device S is configured to receive a signal from the control device 16 and emit an alarm sound using a bell or buzzer, or to flash a red alarm lamp, and the key is to remove the adhesive on the back side of the veneer being carried out from the spretzer. It is sufficient as long as it quickly informs the operator of coating defects.

To explain the embodiment of the present invention having the above configuration, first, the glue spreader 1 is activated and the glue roll and doctor roll are rotated. Next, after filling each roll with adhesive through the supply pipe, when the veneer is inserted in the direction of arrow A between the upper and lower glue rolls, a specified amount of adhesive is applied to both the front and back surfaces of the veneer, and the adhesive is applied to the exit table 11. arrow pointing on the transfer disk
It will move in the A' direction.

On the other hand, on the back side of the glued veneer P, the presence and amount of moisture (adhesive) is detected by the detection member 15 on the spreader delivery side, and for example, any break in the adhesive is immediately transmitted to the control device 16. Furthermore, since the control device issues a signal to the alarm device S to activate it, the alarm device immediately issues an alarm to notify the operator of any abnormality.

The worker who came into contact with the alarm should temporarily stop the operation of the spretzer and perform inspection and maintenance, or replenish the adhesive and restart the operation. All you have to do is let it pass through the Spretzder. As a result of the above, there is no loss of material due to adhesive defects, and the occurrence of defective products can also be eliminated.

[Brief explanation of the drawing]

The figure is an overall side view of one embodiment of the present invention. 1... Glue spreader, 3, 3'... Glue roll, 4, 4'... Doctor roll, 5,
5'...Adhesive, 11...Exit table, 15...
...Detection member, R...Conveyance road surface, S...Alarm device.

Claims (1)

[Scope of Claim for Utility Model Registration] 1. Glue rolls for applying adhesive that are arranged vertically facing each other, doctor rolls that are provided so as to be able to approach and separate from each other in the front and rear directions of the glue rolls, and that adjust the application amount; In the glue spreader, which consists of a driving device for each roll, a detection member is installed on the veneer delivery side of the glue spreader to detect moisture on the back side of the veneer to be delivered, and an alarm device is activated in response to a signal from the detection member. 1. A glue spreader applicator comprising: a control device that operates as appropriate; and an alarm device that issues an alarm based on a signal from the control device. 2. The glue spreader applicator according to claim 1, wherein a plurality of detection members are linearly arranged in a direction perpendicular to the veneer transport direction of the glue spreader.