JPS5939482Y2 - Doctor roll of plywood gluing machine - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an apparatus for uniformly applying adhesive to the top or upper and lower surfaces of a plywood veneer during the production of plywood or veneer laminates.

When applying the required amount of adhesive to the top and bottom or top-F side of the veneer veneer, the adhesive is usually placed on the side of the L lower application rolls 1 and 2, as shown in FIG.
1 -L that can move forward and backward to appropriately regulate the amount of adhesive applied to the bottom surface
A gluing machine 6 for plywood which is intercepted by the lower doctor rolls 4 and 5 is used. Conventionally, the gluing machine 6 for plywood of the above model is used to apply a desired adhesive to the upper and lower surfaces of the veneer veneer 3. are usually engraved at regular intervals on the outer circumferential surface of the lower coating rolls 1 and 2 by moving the upper and lower doctor rolls 4 and 5 forward relative to the upper and lower coating rolls 1 and 2 to set an appropriate amount of squeezing. After an appropriate amount of adhesive coating is transferred and accumulated in the recessed part of the groove 7, the veneer veneer 3 is passed between the upper and lower coating rolls 1.2 to apply the adhesive.

According to the commonly applied veneer veneer 3/J° method, L
The upper and lower doctor rolls 4 and 5 transfer an appropriate amount of adhesive coating to the grooves 7 of the lower coating rolls 1 and 2 as the rolls rotate. When the adhesive is retained, the upper and lower applicator rolls 1 and 2 are bent toward the center compared to the support points at both ends due to the biting pressure of the adhesive.
It is in a curved state, and an increased amount of adhesive is transferred to the upper and lower coating rolls 1 and 2 closer to the center than the desired squeezing amount, and a uniform adhesive film is applied to the grooves of the LF coating rolls 1 and 2. 7
As a result, the adhesive cannot be uniformly applied to the surface of the veneer veneer 3-''7'.

For this reason, near the top and bottom doctor rolls 4 and 5 -L"
-F When transferring the adhesive film to the coating rolls 1 and 2, the diameters of the upper and lower coating rolls 1' and 2' are set at both ends as shown in Fig. 2, taking into consideration the amount of deflection due to the adhesive's biting resistance. Compared to this, the center part is made Waka-F large, and the veneer veneer 3
The adhesive is applied uniformly to the top and bottom surfaces.

However, since the coating rolls 1' and 2' are usually made of an elastic material such as rubber, and the doctor rolls 4 and 5 are made of a metal material, the upper and lower doctor rolls 4 and 5 are connected to each other through the adhesive layer. Pressure force is constantly applied to the upper and lower applicator rolls 1' and 2', and the shape of the groove 7 carved on the outer periphery gradually wears out from the vicinity of the boundary point P between the originally formed diameter differences due to changes over time. Not only does this extremely reduce the accuracy of the entire roll, but in addition, an excessive amount of adhesive is transferred and retained especially in the vicinity of the point P compared to the intended reduction amount, and the longitudinal direction of the veneer veneer 3 - It becomes impossible to apply adhesive uniformly to the bottom surface of L.

Furthermore, the grooves 7 of the upper and lower coating rolls 1' and 2'
Although the adhesive film is transferred and retained uniformly in the recesses along the length of the recesses, usually the upper application roll 1'
Since the rollers 1' and 2' are supported by their own weight on the base coating roll 2'-1-, the axes of each roll 1' and 2' are supported in a parallel state as shown in FIG. Due to the difference in diameter, the gap near the center and near both ends is not constant, and the transfer distance of the adhesive coating is uneven, and the upper The self-weight pressure exerted by the application roll 1' is non-uniform over its longitudinal direction;
'(1 incapacitated)

In view of the above, the present invention is designed to move forward and backward relative to the applicator roll.The diameter of the doctor roll, which has excellent abrasion resistance, is slightly larger at the center than at both ends. Grooves are carved at regular intervals, and an embodiment thereof will be described below with reference to the accompanying drawings.

In the plywood gluing machine 6 described above and shown in FIG.
In order to absorb the amount of roll deflection caused by the biting pressure of the adhesive when transferring the adhesive film to the upper and lower coating rolls 1 and 2, according to the length of each roll, as shown in FIG.
The diameters of the upper and lower doctor rolls 4', 5' are slightly larger at the center than at both ends, and grooves 7' are carved at regular intervals on their outer peripheral surfaces, while the upper and lower application rolls 1 .2 into a right cylindrical shape, and its outer peripheral surface is flat.

In the above configuration, when applying a desired amount of adhesive to the upper and lower surfaces of the veneer veneer 3, first, the L lower application roll 1,
2 and upper and lower doctor rolls 4'.

5' is moved forward to set the appropriate amount of throttling, and then the upper and lower doctor rolls 4' are rotated as each roll mutually rotates.

The adhesive once retained in the concave portion of the groove 7' of the roller 5' is transferred to the outer peripheral surfaces of the upper and lower coating rolls 1 and 2 by the state of interfacial tension.

Each roll is bent in its longitudinal direction by the biting pressure of the adhesive, and in response to this bending, a difference in diameter is formed in the upper and lower doctor rolls 4', 5' in the longitudinal direction. Therefore, the coating film transfer of the adhesive is uniform over the entire longitudinal direction as expected.

Next, the coating film transferred in an interfacial tension state to the outer peripheral surfaces of the -L undercoat rolls 1 and 2 is applied to the lower surface of the veneer veneer 37, which is fed with its fiber direction perpendicular to the longitudinal direction of the rolls. However, as shown in Fig. 5, the upper and lower coating rolls 1
, 2 are formed in a right cylindrical shape, and the outer peripheral surfaces of each roll 1 and 2 are maintained parallel to each other as well as the axis, so the roll gap is constant, and therefore the transfer position of the adhesive coating is Since it is uniform in the longitudinal direction and the self-weight pressure by the upper coating roll 1 is uniform over the longitudinal direction of the veneer veneer 3, uniform coating of -L on the lower surface can be expected.

As described above, according to the present invention, the diameter of the doctor roll is made slightly larger at the center than at both ends, and grooves are carved at regular intervals on the outer circumferential surface of the doctor roll. , uniformity of adhesive to veneer veneer! -It is possible to apply the coating, and the coating roll is also attached to this.
Compared to the applicator roll in the conventional device described above, it is easy to process and has a high-precision finish, and the degree of wear due to changes over time is significantly reduced, and the improvement in repressurization accuracy makes it easy to replace due to wear. It is easy to perform and therefore has various effects such as excellent viscosity maintenance during the period of use.

[Brief explanation of the drawing]

Fig. 1 is a schematic diagram showing a gluing machine for plywood, Fig. 2 is a schematic plan view showing the relationship between the applicator roll and the doctor roll in the conventional device, and Fig. 3 is a schematic diagram showing the relationship between the adhesive application roll and the doctor roll in the conventional device. FIG. 4 is a schematic plan view showing the relationship between a coating roll and a doctor roll according to an embodiment of the device of the present invention, and FIG. 5 is an explanatory diagram showing the state of application of the adhesive. It is a diagram. 1, 1', 2.2'... Upper and lower coating rolls,
3...Plywood veneer, 4.4', 5.5',
...Upper and lower doctor rolls, 6...plywood glue machine, 7,7'...grooves.

Claims (1)

[Scope of utility model registration request] This is a plywood gluing machine that uses a rotatably supported application roll and a doctor roll installed in parallel that can move forward and backward to regulate the amount of adhesive applied to the surface of the veneer veneer.・The application roll is formed into a right cylindrical shape (7
, and the outer circumferential surface thereof is flat, while the diameter of the doctor roll is slightly larger at the center than at both ends, and grooves are carved at regular intervals on the outer circumferential surface. Doctor roll in plywood gluing machine.