JPH0237289B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method and apparatus for grooving a veneer as a material for artificially decorated veneers.

First of all, let me explain about artificial decorative veneer.It is made by compressing and laminating a large number of material veneers and bonding them together to form a frit. This fritsch is then sliced along a plane that passes through several veneers so that the boundaries between the veneers appear on the surface as a wood grain (annual ring) pattern.The groove processing for veneer 1 is as follows. Formed for a reason. That is, as shown in FIG. 1a, a large number of grooves 2 parallel to the fiber direction are provided on one surface, and these are laminated and bonded via an adhesive layer 3 to form a fritch 4. At this time, if the fritsch 4 is pressed so as to be curved as shown in Figure b and then sliced diagonally, an artificial decorative veneer 5 with a grain pattern as shown in Figure c can be obtained. At the same time, the grooves 2 provided on the veneer 1 express the jagged pattern of conduits and annual rings in the wood grain pattern.

For this reason, grooves are formed on the veneer as a raw material, and a conventional example of this groove processing is shown in FIG. The veneer 1 is fed between a feed roll 10 and a grooved roll 11 in the same direction as its fiber direction, and a large number of grooves 2 are formed on the surface of the veneer 1 by the grooved roll 11 under pressure. It forms. However, this has the disadvantage that the grooves 2 become shallow due to the elastic recovery of the veneer 1 and swelling due to moisture.Also, if the grooves 2 are deepened during machining to account for the amount of recovery, the grooves 2 become shallower than the veneer 1. Since the direction of the fibers is the same as that of the veneer 1, it has the disadvantage that cracks are likely to occur in the veneer 1 during processing. For this purpose, as shown in FIG. 3, a roll press consisting of a feed roll 12 and a pressure roll 13 is installed in front of the feed roll 10 and the grooved roll 11, and the circumferential speed of the roll press is adjusted between the feed roll 10 and the grooved roll. It has been proposed that the speed is slower than the attached roll 11. In the figure, 14 is a motor, and 15 is a guide plate. First, the veneer 1 is compressed by a roll press until it approaches a plastic region, and then grooved by a grooved roll 11. The grooves 2 that have been formed do not become shallow due to elastic restoration, and since the circumferential speed of the roll press is slowed down, the veneer 1 may sag between the roll press and the grooved roll 11, causing trouble. Moreover, the friction between the grooved roll 11 and the veneer 1 causes the grooves 2 to have a tighter shape.

In addition, we paid attention to the swelling caused by moisture, and taking into consideration that if the moisture content of the veneer 1 is low, the grooves 2 due to swelling will not become shallow, but will be more likely to break during groove processing. roll 11
A steam spray device 16 is installed before the feed roll 10 and the feed roll 10.
A hot air dryer 17 is installed in the latter stage, and the steam spraying device 16 first sprays steam onto the veneer 1 to raise the moisture content of the veneer 1 to 40 to 50%. Grooves 2 are formed on the veneer 1, which is in a state where cracks do not easily occur, using a grooved roll 11, and then, immediately after this groove processing, dry hot air is blown to reduce the moisture content of the veneer 1.
It has also been proposed to reduce the thickness to about 20% to prevent the groove 2 from becoming shallower due to swelling. In the figure, 18 is a table, and 19 is a roll cover.

Furthermore, when processing deep grooves in consideration of the amount of elastic recovery, since the fiber direction and the grooves are the same, cracks are likely to occur in the veneer 1. Considering this, we created a grooved roll 11 as shown in FIG. protrusion 20 provided on the outer periphery of
It has also been proposed to form grooves 2 in the veneer 1 so that they are meandering and do not follow the fiber direction as much as possible. In this case, in the end, there will be places in the artificially decorated veneer where the annual rings will shift at different positions, but this is not a problem and the occurrence of cracking in the veneer can be significantly reduced.

However, these improved examples are also an extension of the one using the grooved roll shown in FIG. 2, and for this reason, all improved examples have the following problems like the conventional example. In other words, the veneer used as the material for artificial decorative veneers is thin, with a thickness of just under 1 mm to 5 mm.If the veneer is thick, there will be no problem with the above improvement example, but if the veneer is particularly thin, In products with deep grooves, the veneer tends to get stuck in the grooves of the grooved roll and get wrapped around the grooved roll, and the protrusions on the surface of the grooved roll wear quickly. It has the following.

The present invention has been made in view of these points, and its purpose is to create grooves in veneers as a material for artificial decorative veneers, which can prevent the veneer from wrapping around and extend the life of grooved members. The present invention provides a processing method and apparatus.

The present invention will be explained in detail below based on illustrated embodiments. In Figures 6 and below, 6 is a pressure roll having a large number of grooves 21 extending in the circumferential direction on its circumferential surface;
It is arranged above the feed roll 8 and applies a pressing force F toward the feed roll 8. Since the feed roll 8 also serves as a pressure receiving member, it has sufficient rigidity. Reference numeral 7 denotes an endless wire that extends over a tension roller 22, a pair of grooved idlers 9, 9, and a pressure roll 6, and is made of a strong and hard material such as piano wire or spring steel. There are many books arranged in parallel. Although this wire 7 was shown to have a triangular cross section,
The grooves 21 of the pressure roll 6 may be circular as shown in FIG. do not have. The groove 23 in the idler 9 is also for preventing the wire 7 from slipping.

Here, a pair of idlers 9, 9 are arranged so that each wire 7 passes through the surface of the pressure roll 6 with a curvature sufficiently smaller than the curvature of the circumferential surface of the pressure roll 6. If the board 1 is fed between the pressure roll 6 and the feed roll 8 over the guide plate 24 in the same direction as the fiber direction, the surface of the pressure roll 6 presses the surface of the veneer 1, and the pressure roll The wire 7, which has a cross section higher than the depth of the groove 21 of 6, further presses the surface of the veneer 1, and the wire 7 processes the groove 2 in the veneer 1. The wire 7 is only in contact with the surface facing the feed roll 8, and since the wire 7 travels in substantially the same direction as the feeding direction of the veneer 1 without making much of an angle with it, even if the veneer 1 is thin, , also veneer 1
Even if the grooving is deep, the veneer 1 can be pressed by the pressure roll 6.
It does not get wrapped around. Furthermore, even if the veneer 1 were to bite into the wire 7, the curvature around the grooved portion of the wire 7 is small, so that cracks caused by the veneer 1 having a large curvature will not occur. In addition, 25 in the figure is the wire 7
This is a diaphragm for shaking off the veneer 1 stuck to the surface.

While the pressure roll 6 surface compresses the veneer 1, the wire 7 further presses the veneer 1 to form the groove 2 in the veneer 1, which becomes shallower against elastic recovery and swelling due to moisture. It is possible to form grooves 2 that will not cause the veneer 1 to wind around the pressure roll 6, and since the wire 7 has a considerably longer circumference than the pressure roll 6, it has a long life. 7
The depth and shape of the groove 2 formed on the veneer 1 can be easily changed by replacing the groove 2. Note that the modified configuration shown as the improvement example above may be used in combination. In this case, problems caused by elastic recovery and water content can be better resolved.

As described above, in the specified invention and the combined invention, grooves are formed by pressing an endless wire against the surface of the veneer using a pressure roll, and the grooves are formed by pressing the endless wire against the surface of the veneer by pressing the endless wire against the surface of the veneer. Since the curvature of the part that comes into contact with the surface is smaller than the curvature of the outer peripheral surface of the pressure roll, it is possible to create grooves on the surface of the veneer that will not become shallow due to elastic recovery or swelling due to moisture. Even if the thickness of the veneer is thin or the grooves are deep, it can be done without the veneer being wrapped around the pressure roll or being bent significantly, and the wire has a smaller circumference than the pressure roll. Since it is quite long, it has a long service life, and the depth and shape of the groove formed in the veneer can be easily changed by replacing the wire.

[Brief explanation of drawings]

Figures 1 a, b, and c are perspective views showing the manufacturing process of artificial decorative veneers, Figure 2 is a perspective view of the conventional example, Figure 3 is a perspective view of the first improvement example, and Figure 4 is the second improvement. FIG. 5 a and b are a perspective view and a front view of the third improved example, FIG. 6 is a side view of an embodiment of the present invention, and FIG. 7 is a partially sectional front view of the same. , FIGS. 8a and 8b are partially sectional front views of another embodiment,
1 is a single plate, 2 is a groove, 6 is a pressure roll, 7 is a wire, 8 is a feed roll, and 9 is an idler.

Claims (1)

[Claims] 1. The curvature of the portion of the endless wire passing through the outer circumferential surface of the pressure roll that is located on the outer circumferential surface of the pressure roll is made smaller than the curvature of the outer circumferential surface of the pressure roll, so that the size of the endless wire is reduced. A method for grooving a veneer, characterized by forming grooves on the surface of the veneer by pressing a curved portion against the surface of the veneer using a pressure roll. 2. A feed roll and a pressure roll are opposed to each other to form a passage for the veneer, and an endless wire is passed between the idler and the pressure roll located before and after the pressure roll in the direction of feeding the veneer. A veneer grooving device characterized in that the curvature of the portion of the pressure roll that passes through the surface facing the feed roll and the endless wire at the subsequent stage is smaller than the curvature of the outer peripheral surface of the pressure roll.