JPS60135207A - Method of applying thickening water - 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 [Technical Field] The present invention relates to a method of applying thickened water to a sliced veneer or the like.

[Background technology]

Conventionally, a laminated decorative veneer has been obtained by laminating sliced veneers via an adhesive, pressure-molding the laminated flitch II, and slicing this.

In this process, when a moisture-reducing adhesive such as a urethane adhesive is used when laminating the sliced veneers, if the moisture content of the sliced veneers is insufficient, poor adhesion is likely to occur. To prevent this, for example, a naturally rotating sponge roll coater is used to apply thickened water to the sliced veneer.

However, when thickening water is applied using Roll Coke ■ in this way, as shown in Fig. 1, due to the spring wood and summer wood parts of the sliced veneer 2a, and the coarseness and density of the structure, Application unevenness tends to occur, and the thickened water 3a floats on the surface of the sliced veneer 2a. Normally, the veneer coated with thickened water is transported in the direction of arrow A by a belt conveyor 4 as shown in Figure 2, but after the veneer has passed, there is an excess of Sticky water 3b is attached. This thickened water 3b then re-adheres to the sliced veneer 2b that has been coated with the roll coater 1 and sent out, causing uneven coating. In this way, thickened water 3a is applied to the surface of the veneer.
Floating veneer or thickened water 3 on belt conveyor 4
When drying a veneer or the like where b has redeposited and caused uneven coating, the areas where the thickened water has floated and the areas where it has redeposited will have more thickened water, so as shown in Figure 3, drying White crystals 6 appear on the surface of the board 5 (whitening phenomenon). This whitening phenomenon caused a deterioration in the quality of the laminated decorative veneer, and was undesirable.

[Purpose of the invention]

This invention was made in view of these circumstances,
An object of the present invention is to prevent uneven application of thickened water and to prevent whitening from occurring on a veneer. [Disclosure of the Invention] The inventors have made extensive studies to achieve the above object. As a result, this invention was completed.

In this invention, when applying thickened water to a veneer using a roll coater, the veneer coated with thickened water is sent using a belt conveyor whose belt surface is configured to be capable of suction, and air is applied to the surface of the veneer. A first method of applying thickened water is characterized in that the excess thickened water is sprayed on the veneer to diffuse it on the veneer, and the thickened water that has protruded to the side of the veneer is removed by the suction force of a belt. To summarize, when applying thickened water to a veneer using a roll coater, the veneer coated with thickened water is sent using a belt conveyor whose belt surface is configured to be able to be sucked. Using a sponge roll coater that rotates in the opposite direction, the thickened water is pressed and penetrated into the inside of the veneer, while the excess thickened water adhering to the sponge roll coater is suctioned away, and the pressure from the sponge roll coater causes it to spill out to the side. The second gist is a method for applying thickened water, which is characterized in that the thickened water is removed by the suction force of a belt. Hereinafter, embodiments thereof will be described in detail based on the drawings.

FIG. 4 shows a thickened water coating device used in the first method according to the present invention. As shown in FIG. 4, the thickened water application device 7 includes a sponge roll coater 8 that applies thickened water to the sliced veneer, and a sponge roll coater 8 that sends the excess thickened water that has been applied through an air supply pipe 9. The incoming air is passed through the nozzle i.
The air spraying device 11 that sprays from oa, 10b, and 10c and diffuses the thickened water on the veneer is composed of a belt conveyor 13 that moves in the direction of arrow B to send the thickened water coated veneer 12a. . The air blowing device 11 is configured such that the number, direction, etc. of air nozzles can be freely changed as necessary in order to efficiently diffuse the thickened water. The belt conveyor 13 has a large number of holes 14 on the belt surface, and these holes serve as suction holes and communicate with a suction pump (not shown). It is possible to suction thickened water.

In this configuration, the thickened water coated veneer 12a coated with thickened water by the sponge roll coater 8 is sent onto the belt conveyor 13 and moved. In this case, the thickened water coated veneer 12a has excess thickened water 3a floating in some places on the surface of the veneer 12a, as shown in FIG. On the other hand, when air is blown from nozzles 10a, 10b, and 10c provided above the belt conveyor 13, the floating thickened water is uniformly spread over the entire surface of the veneer 12a, as shown in FIG. At this time, excess thickened water 3b
As shown in FIG. 6, it protrudes from the side of the veneer 12a. The thickened water 3b that has protruded to the side of the veneer 12a is sucked and removed as shown by the arrow through the holes 14 of the belt conveyor 13, as shown in FIG. In addition, belt conveyor 13
The belt is not limited to one having holes as shown in FIG. 4, as long as it is capable of suctioning thickened water, and may be made of, for example, a wire mesh-like belt or a coarse-density cloth.

By using this coating method, the veneer coated with thickened water can be coated evenly. Therefore, the veneer is
It does not cause any whitening phenomenon even when it dries.

FIG. 8 shows a thickened water application device used in the second method according to the present invention. As shown in FIG. 8, this thickened water application bag R15 replaces the air blowing device used to diffuse excess thickened water on the veneer in the thickened water application device 7. , a sponge roll coater 16 is used which presses excess thickened water and allows it to penetrate into the interior of the veneer. For this reason, the sponge roll coater 16
It is designed to rotate in the opposite direction (reverse) as shown by the arrow with respect to the advancing direction of the veneer so that the pressing effect is large. The sponge roll coater 16 is provided with a suction section 18 at a position substantially in contact with the circumferential surface of the sponge roll coater 16 to suck out excess thickened water adhering to the sponge roll coater. The suction section 18 is connected to a suction pipe 19. The other end of the suction pipe 19 is connected to a vacuum pump (not shown) or the like.

In this configuration, the thickened water coated veneer 12b coated with thickened water by the sponge roll coater 8 is sent onto the belt conveyor 13. While moving, the veneer 12b sent onto the belt conveyor 13 is strongly pressed by a sponge roll coater 16 that rotates in the opposite direction to the traveling direction of the veneer 12b. A portion of the excess thickened water 3a on the surface of the pressed veneer 12b penetrates into the interior of the veneer 12b. Some of the thickened water 3a that has not penetrated completely adheres to the sponge roll caulk 16, but a very small portion of the thickened water that does not completely adhere to the sponge roll coater 16 is diffused and coated on the veneer. It will protrude to the side of 12b. Excess thickened water adhering to the sponge roll coater 16 is removed from the suction pipe 1 from the suction section 1B.
9 and is removed by suction as shown by the arrow. Further, the thickened water that has spread and protruded to the side of the veneer 12b is suctioned away as shown by the arrow through the hole 14 of the belt conveyor 13 as shown in FIG. 7, as in the case of the first method.

By using such a coating method, the thickened water-coated veneer can be coated evenly, with even more uniform coating, and no whitening phenomenon occurs.

Examples will be described below.

(Example 1) Using a sliced agathis veneer having a thickness of 0.28 mm, a width of 180 mm, and a length of 4000 mm, thickened water was applied based on the first method. Thickened water has a viscosity of 500-71000c
Using an acrylic emulsion solution with a concentration of 25% at p, the coating amount is 80 to 90 g/r+? It was applied to a sliced veneer using a roll coater so that the following results were obtained. Nozzle 3 with a diameter of 0.4n+m is applied to the excess thickened water floating on the surface of the applied veneer.
Spraying was carried out by blowing air at a pressure of 150 to 200 kg/cal. The excess thickened water that spread and protruded to the side of the veneer was removed by suction using a belt conveyor with a suction force of 1.0 kg/ctA.

The resulting thickened water-coated veneer was dried and tested on 500 veneers. As a result, no whitening phenomenon was observed at all, and the whitening failure rate due to uneven coating was 0%.

(Example 2) Using the same sliced veneer and thickened water as in Example 1, thickened water was applied based on the second method. The amount of thickened water applied and the suction force of the belt conveyor were the same as in Example 1. The excess thickened water on the surface of the veneer coated with the roll coater is strongly pressed with a sponge roll coater that rotates in the opposite direction to the direction in which the veneer travels, allowing it to penetrate into the veneer and removing the thickened water that has adhered to the sponge roll coater. The thickened water was removed by suction from the suction unit with a suction force of 1.0 kg/crj. In addition, part of the thickened water that spread during pressing and protruded to the side of the veneer was removed by suction using a belt conveyor in the same manner as in Example 1.

The obtained veneer coated with thickened water was dried and tested on 500 sheets. As a result, no whitening phenomenon was observed, and the whitening failure rate due to uneven coating was 0%. [Effects of the Invention] This invention In the first method, when applying the thickened water to the veneer using a roll coater, the veneer coated with the thickened water is sent using a belt conveyor whose heald surface is configured to be capable of suction. Air is blown onto the surface to diffuse excess thickened water on the veneer, and the thickened water that protrudes to the side of the veneer is removed by the suction force of the belt, resulting in thickened water application. Excess thickened water adhering to the surface of the veneer is removed, resulting in uneven coating.Therefore, even when the veneer is dried, no whitening phenomenon occurs.

Further, in a second method according to the present invention, when applying thickened water to a veneer using a roll coater, a belt conveyor whose belt surface is configured to be capable of suction is used to send the thickened water coated veneer. Using a sponge roll coater that rotates in the opposite direction to the direction in which the veneer travels, the thickened water is pressed and penetrated into the veneer, while the excess thickened water adhering to the sponge roll coater is removed by suction. The belt's suction force removes the thickened water that protrudes sideways due to the pressure from the sponge roll coater, so excess thickened water adhering to the surface is removed, resulting in uneven coating.
Even when the veneer is dried, it does not cause any whitening phenomenon.

For this reason, in the case of the conventional coating method using only a sponge roll coater, whitening defects occurred on 1,600 out of 2,000 veneers coated, and the whitening defect rate was 80%. According to the method, the whitening defect rate is 0%,
A significantly large effect can be obtained.

[Brief explanation of the drawing]

1 and 2 are perspective views of a conventional thickened water coating device, FIG. 3 is a perspective view of a conventional thickened water applied veneer, and FIG. 4 is a first perspective view of a conventional thickened water coating device. Fig. 5 is a perspective view of the veneer immediately after applying the thickening water, and Fig. 6 is a perspective view of the veneer immediately after applying the thickening water. Fig. 7 is a partially enlarged perspective view showing how thickened water protruding from the side of the veneer is removed by suction; Fig. 8 is a partially enlarged perspective view of thickened water used in the second method according to the present invention. FIG. 3 is a perspective view of the coating device; 3a, 3b... Thickened water 7, 15... Thickened water applicator 8... Sponge roll coat';' 10a, 10
b, 10c... Nozzle 11... Air blowing device 12a, 12b... Thickening water coating veneer 13... Belt conveyor 14... Hole 16... Sponge roll coater 18... Attraction Department Representative Patent Attorney Takehiko Matsumoto

Claims (1)

[Claims] (11) When applying thickened water to a veneer using a roll coater, the veneer coated with thickened water is sent using a belt conveyor whose belt surface is configured to be capable of suction. A method for applying thickened water characterized by blowing air onto the board surface to diffuse excess thickened water on the veneer, and removing thickened water that protrudes to the side of the veneer using the suction force of a belt. (2) When applying the thickened water to the veneer using a roll coater, the veneer coated with the thickened water is sent using a belt conveyor whose belt surface is configured to be suctionable, and the direction of travel of the veneer is Using a sponge roll coater that rotates in the opposite direction, the thickened water is pressed and penetrated into the inside of the veneer. A method for applying thickened water characterized by removing thickened water that protrudes to the side using the suction force of a heald.