JPS62117670A - Method for coating hot-melt adhesive on end fact of veneer - Google Patents

Abstract

PURPOSE:To coat an adhesive on a veneer with high efficiency by reciprocating a body for supplying the melt of a hot-melt adhesive and a threading guide body to form a wiry or filmy coating zone, and passing the veneer through the zone. CONSTITUTION:In the method for coating the hot-melt adhesive on a veneer to be scarf-jointed or the wavy end face of the veneer, any or both of the body 1 for supplying the melt of the hot-melt adhesive and the threading guide body 9 are reciprocated to thread the hot melt and to form the wiry or filmy coating zone. Then the veneer A is passed through the coating zone to deposit the hot melt on the front end face. Consequently, the hot melt is excellently deposited and coated on the veneer without damaging the veneer even when an extremely thin and fragile veneer is used.

Description

[Detailed Description of the Invention] [Object of the Invention] The present invention relates to a method of applying hot melt adhesive to the joint end surfaces of veneer veneers to be spliced together, and particularly to very thin veneers or wavy veneers. However, it provides a method that allows for good coating.

Conventional means for applying hot melt adhesive (hereinafter referred to simply as hot melt) to the joint end surface in cross-splitting of veneers include the automatic gluing device of the veneer cross-splitting machine disclosed in Utility Model Publication No. 44-28158 @ Publication. There are devices for applying gluing to the veneer middle plate cross-cutting machine described in Japanese Patent Publication No. 55-40401, but the former has a configuration in which the joint end surface is brought into contact with a thin rod (application body), so it is somewhat difficult to apply glue. It can be applied to wavy veneer, but
If the veneer is thin or fragile, the contact resistance may damage the middle veneer or cause the veneer to temporarily stop, reducing efficiency. The hot melt ejected from the nozzle of the block is scraped off by the end face of the veneer and collided with the protruding surface. Damage occurs due to contact running and resistance from collisions with protruding surfaces, and with corrugated veneers, scraping becomes uneven, making it impossible to apply uniformly, and efficiency decreases as the veneer stops on protruding surfaces. There was a problem.

This invention completely eliminates these drawbacks of the conventional method, and utilizes the stringy properties of hot melt.
By forming a linear or film-like coating band of hot melt 1- that crosses the conveying surface of the veneer, and passing the veneer through this coating band, the resistance during coating is almost zero, resulting in extremely thin veneer or It enables coating even on fragile veneers without any problems, uniformly coats even corrugated veneers, and eliminates temporary stops of veneers, making highly efficient coating possible.

[Structure of the invention]

To explain this invention with reference to an embodiment shown in the drawings, the conveying plane XX is a plane on which the veneer A is conveyed by a conveying means such as an endless belt or a roller, and is generally used when performing horizontal stripping of veneers. In this case, the veneer is conveyed in the direction of conveyance direction F perpendicular to the conveyance plane It comes into contact with the rear end surface Δb, and the veneer A and the preceding veneer A-1 are laterally joined by hot melt at the end surface.

In FIG. 1, a melt supply body 1 for hot melt G is disposed below the conveyance plane X-X, and the melt supply body 1 is, for example,
- A supply block 3 with a small hole 2 that serves as a passage for the hot melt l-G, a glue tank 4 that stores the hot melt l-G, a vibrator 5 that connects the glue tank 4 and one end opening 2a of the small hole 2 of the supply block 3, and a vibrator 5 The supply block 3 and the glue tank 4 are equipped with a heater 7, and the vibrator 5, the on-off valve 6, etc. are also equipped with heaters as necessary, and the hot melt G is heated to a molten state, compressed air is sent into the glue tank 4 via a vibrator 8, and by opening and closing the on-off valve 6, the molten hot water is released from the outlet 2b of the small hole 2 opened on the top surface of the supply block 3. It is designed to discharge an appropriate amount of melt G.

The thread pulling guide 9 is disposed above the conveyance plane X-X, and its supporting member 10 is operated by a mechanism 11 such as a fluid pressure cylinder, so that the thread pulling guide 9 is moved between the upper position indicated by the solid line in the figure and the dotted line. When the thread pulling guide body 9 moves back and forth between the position shown by the dotted line and the position shown by the solid line, and the position shown by the dotted line and the position shown by the solid line. The hot melt G adhering to this becomes stringy due to its viscosity, and a linear or film-like coating band (8, Ba) is formed across the conveying surface XX.

The string guide 9 is made of metal or other suitable material that is heat resistant and to which the melt 1 to melt G in a molten state easily adheres, and when forming a linear coating band B, as shown in FIG. When forming a membrane-like coating band 3a by using a hemispherical thread-pulling guide 9a whose tip has a relatively small contact area with the hot melt G, it is thin and wide as shown in Fig. 3. A plate-shaped string pulling guide 9b is used, and a linear string pulling guide 9a is arranged in the width direction as shown in FIG. Hot melt G
As shown in FIG. 3(b), the film-like string guide 9b is made into a plate-like shape having a length in the width direction, and the hot melt G is applied in a film-like manner in the width direction to the end surface of the middle plate. A plurality of small holes 2 are formed in the thread guide member 9a so that the coating band B or Ba can adhere to the supply block 3 of the melt supply member 1. Attachment〈
(Fig. 2b)), and a slit-shaped small hole 2-1 (Fig. 3b) is provided in the thread pulling guide 9b.

Then, the veneer A is passed through these linear or film-like coating bands B or Ba, and the linear or film-like hot melt G is adhered to the @ end surface Aa. A detector 12 is provided on the conveyance plane XX, and the detector 1
2, the opening/closing valve 6 is opened/closed once to discharge the hot melt G from the discharge port 2b of the supply block 3, and the signal is transmitted to the actuating mechanism 11 to cause the thread pulling guide 9 to be activated. Move forward and backward to form a linear or film-like coating band B or 3a that crosses the conveyance plane XX, and when the front end surface Aa of the Ii plate A passes through this coating band B or 3a, The molten hot melt G is applied in the form of a line or film.

Front end surface A of veneer A to which molten hot melt G is attached
a comes into contact with the rear end surface Ab of the preceding veneer Δ-1, and the veneer mA~1 is joined to the veneer by cooling and solidifying the Botmelt G interposed on the end surface.

In the embodiment shown in FIG. 1, the melt supply body 1 is disposed below the conveying surface The string guide 9 waits in contact with the hot melt G discharged from the discharge port 2b at the lower position shown by the dotted line, and then moves to the upper position shown by the solid line when forming a coating band. It can be carried out in the same way even if it is configured to rise. In this case, the melt supply body 1 and the thread drawing guide body 9 are arranged on the same lower side of the conveyance plane x-X, and the melt supply body 1 The same effect can be achieved by providing an actuating mechanism for moving forward and backward, so that only the melt supply body 1 or both together with the thread pulling guide body 9 can be moved forward and backward.

In the embodiment shown in FIG. 4, the melt supply body 1 and the thread-pulling guide 9 are disposed above the conveyance plane XX, and the thread-pulling guide 9 is shown by a solid line.
closes the discharge port 2b in a state where it is in contact with the hot melt G discharged from the discharge port 2b on the lower surface of the supply block 3,
When the thread pulling guide 9 reaches the lower position shown by the dotted line, a linear or film-like coating band B or Ba is formed across the conveying surface XX. In this case as well, the thread pulling guide 9 is made to stand by at the lower position shown by the dotted line, and when activated, it is configured to rise so as to come into contact with the appropriate amount of hot melt G discharged from the discharge port 2b by the on-off valve, and then descend. It can also be implemented in the same way.

The embodiment shown in FIG. 5 uses a glue tank 4 as the melt supply body 1.
In this case, the glue tank 4a
The hot melt G is melted by the heater 7, and when forming the linear application band B, the string guide 9a shown in figure (b) is used. When forming a film-like coating band [3a (C
) Using the thread pulling guide body 9b shown in the figure, these thread pulling guide bodies 9a and 9b are disposed above the conveyance plane The thread guides 9a and 9b are normally located at a lower position in contact with the hot melt G in the glue tank 4a, and are applied to the end surface of the veneer. The structure is such that when applying the hot melt G, coating bands B and Ba are formed which rise and cross the conveying surface XX.

In the present invention, since the stringing property of hot melt G is utilized, when a coating band is formed and the veneer is passed through, there is a gap between the hot melt G applied to the end surface and the melt supply body and the stringing guide. There is a risk that hot melt G may adhere to the front and back surfaces of the veneer due to stringing, but as a means to prevent this, the melt supply body and the stringing guide should be placed as close as possible to the conveying surface. In addition, glue cutting means of an appropriate shape heated as necessary may be provided at predetermined positions above and below the conveying surface It is provided so as to appear and retract between the plate, the melt supply body, and the thread-pulling guide to melt and cut the string-pulling hot melt therebetween.

(Effects of the Invention) As described above, the present invention is equipped with a melt supply body and a string guide body that keep the hot melt in a molten state as it advances and retreats from above and below or on either side of the conveying surface of the veneer for cross-splitting, etc. A linear or film-like application band of molten hot melt is formed across the conveyance surface of the veneer, and the veneer is passed through this coating body to deposit the molten hot melt on the front end surface of the veneer. Therefore, when hot melt is applied to the front end surface of a veneer, there is almost no resistance such as contacting or running in contact with the coated body as in the conventional method, and the veneer is extremely thin or fragile. The hot melt can be applied to the edge of the veneer in a good manner without causing any damage or other troubles, and the adhesion is always uniform even on wavy veneers, and there is no need to stop the veneer. It has various effects such as highly efficient coating.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention, and FIG. 1 is a side view, and FIG. 2 is a schematic explanatory diagram when forming a linear coating band.
Figure a) is a side view (Figure bJ is a front view, Figure 3 is a schematic explanatory diagram when forming a film-like coating band (Figure 31 is a side view, Figure bJ is a front view, Figure 4 is a A schematic explanatory diagram when a melt supply body and a string guide are arranged above the conveying surface, and FIG. 5 is a strategic explanatory diagram when only a glue tank is used as a melt supply body, and (a) is a side view. Figures (b) and (C) are front views. 1... Molten supply body 2.2-1... Small hole 3.
... Supply block 4, 4a ... Glue tank 5 ...
Pipe 6...Open Close Valve 7.
...Heater 8...Pipe 9.9a, 9
b... Thread pulling guide 10... Support member 11... Operating mechanism 12... Detector A, A-1... Single plate Aa... End Ab... Rear end surface
B... Linear coating band 3a... Membrane coating band F.
...Conveyance direction G...Hot melt adhesive.

Claims (1)

[Claims] A hot-melt adhesive melting supply body and a thread-pulling guide are provided on the top and bottom or either side of the conveying surface of the veneer, and either one or both of the melt-supply body and the thread-pulling guide is moved back and forth to remove the hot melt supply body. A linear or film-like coating band of the molten hot melt adhesive is formed across the conveying surface of the veneer using the melt adhesive and the thread guide, and the veneer is passed through the coating band and the molten hot melt adhesive is applied to the end surface of the veneer. A method for applying hot melt adhesive to the end face of a veneer, characterized by applying hot melt adhesive to the end face of a veneer.