JPS5939481Y2 - 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 -L side or the upper and lower surfaces of a veneer veneer during the production of plywood or laminated veneer.

When applying the required amount of adhesive to the -L surface or the upper and lower surfaces of the veneer veneer, as shown in FIG.
A plywood gluing machine 6 consisting of upper and lower doctor rolls 4 and 5 that can move forward and backward to appropriately regulate the amount of adhesive applied to the upper F surface.
Conventionally, in order to apply a desired adhesive to the upper and lower surfaces of the veneer veneer 3 using the above-mentioned plywood gluing machine 6, upper and lower doctor rolls 4 and 5 are used for the upper and lower coating rolls 1 and 2. After moving forward and setting the amount of reduction appropriately, the veneer veneer 3 is passed between the upper r coating rolls 1 and 2, and adhesive is applied.

Since each of the above rolls is formed to be long enough to correspond to the three dimensions of the veneer veneer that is generally coated, the upper and lower doctor rolls 4 and 5 apply an appropriate amount of adhesive during the above coating operation. When the upper and lower application rolls 1 and 2 are transferred as the roll rotates, the pressure of the adhesive biting causes the upper and lower application rolls 1 and 2 to bend toward the center compared to the support points at both ends, resulting in a curved state. , the amount of adhesive increases on the upper and lower coating rolls 1 and 2 that are closer to the center compared to the originally set squeezing amount, and a uniform coating film of adhesive cannot be transferred to the upper and lower coating rolls 1 and 2, causing the veneer to become flat. As a result, the adhesive cannot be uniformly applied to the upper and lower surfaces of the plate 3.

For this reason, in recent years, when transferring the adhesive film from the upper and lower doctor rolls 4 and 5 to the upper and lower coating rolls 1 and 2, consideration has been given to the amount of deflection due to the biting resistance of the adhesive, and as shown in FIG. The diameters of 1' and 2' are made slightly larger toward the center than at both ends, so that the adhesive can be uniformly applied to the upper and lower surfaces of the veneer veneer 3.

However, the coating rolls 1' and 2' are usually made of an elastic material such as rubber, and the doctor rolls 4 and 5 are
Since it is made of metallic material, during the coating process,
The pressing force of the upper and lower doctor rolls 4 and 5 is applied to the upper and lower coating rolls 1' through the adhesive layer.

2' will be constantly loaded, and its outer periphery will gradually start to wear from the vicinity of the boundary point P between the diameter differences formed as expected due to changes over time. This will result in excessive adhesive being transferred, and the veneer veneer 3
It becomes impossible to uniformly apply the adhesive to the lower surface in the longitudinal direction -L.

Furthermore, although the adhesive coating is uniformly transferred to the upper and lower application rolls 1 and 2' in the longitudinal direction, the upper application roll 1' is normally transferred onto the lower application roll 2' by its own weight. Since the structure is axially mounted, each roll 1', 2
' is supported with its axes parallel to each other, as shown in Figure 3, but due to the difference in diameter, the gap near the center and near both ends is not constant, and the distance of transfer of the adhesive coating is In addition, since the self-weight pressure exerted by the upper coating roll 1' on the veneer veneer 3 passing over the lower coating roll 2' is uneven over its longitudinal direction, the adhesive must be applied uniformly. That had become impossible.

In view of the above, the present invention is a doctor roll with excellent abrasion resistance that is configured to move forward and backward relative to the application roll, and the diameter of the doctor roll is slightly larger at the center than at both ends.
One embodiment will be described below based on the accompanying drawings.

In the plywood gluing machine 6 described above and shown in FIG.
- When transferring the coating film of the adhesive to the L lower coating rolls 1 and 2,
In order to absorb the amount of roll deflection caused by the biting pressure of the adhesive depending on the length of each roll, the diameters of the upper and lower doctor rolls 4', 5' are set at the center compared to their both ends, as shown in Fig. 4. The deviation is formed slightly larger, while the -L
The lower coating rolls 1 and 2 are formed into a right cylindrical shape.

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

5' is moved forward to set an appropriate squeezing amount, and then the coating film of the adhesive is transferred to the upper and lower application rolls 1 and 2 as the respective rolls mutually rotate.

At this time, each roll is bent in its longitudinal direction due to the biting pressure of the adhesive, and in response to this bending, a difference in diameter is formed in the lower doctor rolls 4' and 5' in the longitudinal direction. As a result, the coating film transfer of the adhesive is uniform over the entire longitudinal direction as expected.

Next, the coating film transferred to the upper and lower coating rolls 1 and 2 is applied to the lower surface of three veneer veneers, which are fed with the fiber direction perpendicular to the longitudinal direction of the rolls. Since the undercoat rolls 1 and 2 are formed into a right cylindrical shape, and the outer circumferential surface of each roll 1 and 2 is maintained in a 41-row state as well as the axis center. , the gap between the rolls is constant, and therefore the transfer position of the adhesive coating is uniform in the longitudinal direction, and the self-weight pressure from the coating roll 1 is uniform over the longitudinal direction of the veneer veneer 3, so that the top and bottom surfaces are uniform. Uniform application can be expected.

As described above, according to the present invention, the uniform application of adhesive to the veneer veneer can be achieved by a simple configuration in which the diameter of the doctor roll is formed to be smaller at the center than at both ends. There is also a coating roll accompanying this.
Compared to the applicator roll in the conventional device described above, it is easy to process, has a high viscosity, and the degree of wear due to changes over time is significantly reduced, and the improved viscosity of the rupture center makes it easier to replace due to wear. It is easy to perform and therefore has various effects such as superior accuracy 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 doctor roll in the conventional device, and Fig. 3 is a schematic diagram showing the relationship between the 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 'F coating roll,
3...Plywood veneer, 4.4', 5.5'...
...Upper and lower doctor rolls, 6...Synthesis gluing machine.

Claims (1)

[Scope of utility model registration request] A plywood gluing machine comprising a rotatably supported application roll and a doctor roll arranged in parallel to the application roll so as to be able to move forward and backward to regulate the amount of adhesive applied to the veneer veneer surface. A doctor roll for a plywood gluing machine, characterized in that the applicator roll is formed into a right cylindrical shape, and the diameter of the doctor roll is slightly larger at the center than at both ends.