JPS5911202A - Pressure molding method for laminated veneer - 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 The present invention relates to a method of pressure forming a laminated veneer.

In the conventional veneer pressure molding method, as shown in Fig. 1, a predetermined number of veneers 3 coated with adhesive on one side are stacked on a lower mold (concave mold) 1a with the adhesive coated side 2 facing upward. This is set as one cycle and placed on the lower press platen 4a and press-formed. The press is formed of a lower surface plate 4a and an upper moving plate 4b, and an E-type (convex type) lb is fixed to the lower surface of the upper moving plate 4b by a grub jig 5. A fringe 6, which is obtained by molding laminated veneers into a predetermined shape in each cycle by pressure molding, is already integrally bonded to the lower surface of the mold 1b. By pressure-forming the laminated veneer 7 in each cycle and repeating this operation sequentially, the already pressure-formed 7rich 6 serves as an upper mold, and a new pressure-formed veneer 7 is formed on the underside of this fringe 6. The flitches 6 are adhered one after another. The finally obtained free J-chie is removed from the press and sliced to produce a decorative veneer with a wood grain pattern.

However, in such a conventional lamination method, in order to sequentially adhere the fringe and edge 6 to the upper mold 1b, it was necessary to apply pressure for a long time to completely adhere the veneer so that the veneer would not fall. Also, during pressure molding, the veneer 3 for the next cycle is placed in another lower mold 1a,
By laminating the lower mold 1a and replacing the lower mold 1a, the process balance e[is achieved, but in this way, the f mold 1a
However, this was necessary and resulted in an increase in cost.

Therefore, an object of the present invention is to provide a method for pressure forming a laminated veneer, which can shorten the pressure forming time per cycle, improve workability, and reduce costs.

An embodiment of the present invention will be explained based on Figures 2 to 5. That is, in this method of pressure forming a layered veneer, as shown in FIGS. 2 and 3, support claws 8 are provided at the bottom, which are tilted in the -F direction in a circular direction from both sides of the bottom. The veneers 11 coated with adhesive on one side are stacked with the adhesive-coated surface 10 facing down in the supply frame 9 provided with the support claw 8, and the laminated veneers 12 are supported by being curved in a concave shape. After this, the laminated veneer 12 is opened to form uneven molds 13a, 13.
Then, the supporting claws 8 are pulled out, the laminated veneer 12 is dropped into the concave mold 13a-b, the supply frame 9 is removed, and pressure molding is performed.

The supply frame 9 supplies 11 of the veneers 11 per 1 cycle.
It has a height that can accommodate the layered body, and has a length and a width of 9 which are approximately equal to the size of the veneer 11 so that the veneer 11 does not shift. A pair of support claws 8 are provided at appropriate intervals along the length direction VC of the supply frame 9 so that the support claws 8 penetrate the lower portions of both sides of the supply frame and hold the veneer in a downwardly curved manner. These supporting claws 8, which are arranged in parallel, are all interlocked to be slidable from both sides of the supply frame.

The length of the support claws 8 may be changed as appropriate depending on the width of the veneers to be stacked, but in order to prevent the veneer 11 from sliding on the support claws 8 and falling from the gap between them, the gap C is set as shown in FIG. It is preferable to make it as small as possible. Moreover, the holding of the laminated veneer 12 by the support claws 8 is! ! As shown in Figure 5 fat, the laminated veneer 12 is held at the top of the long axis side of the supporting claw 8a, which has an elliptical cross section with a rough upper surface, or it is
By using a support claw 8b equipped with several rollers 14 as shown in FIG.
It is possible to do so without damaging the veneer or scraping off the adhesive.

As described above, in this embodiment, the laminated veneers 12 are piled up and pressure-formed in the concave mold 13ak, which is the lower mold, in each cycle, so that the mold is opened when the veneers 11 are not completely adhered. However, unlike conventional methods, there is no risk of the fringe falling, and therefore, compared to (5), pressure forming can be performed in a relatively short time.
), production efficiency can be greatly improved. Also,
In the conventional lamination method, two sides of the bottom mold were required in order to replace the bottom mold every cycle, but in this example, the bottom mold (
Since the concave mold 13a) is a negative surface, it is possible to achieve a significant reduction in mold cost.Furthermore, the contact between the support claw 8 and the laminated veneer 12 can be made by line contact or point contact, or by a belt method. Due to the contact structure, there is no deterioration in the quality of the fringe obtained.

Note that the method of stacking veneers into a mold using the supply frame and the support claws can also be used when stacking sheets of ordinary laminates or panels are put into a press.

As described above, the method for pressure forming a laminated veneer of the present invention is as follows:
Inside the supply frame body, which has a pair of support frames at the bottom that are inclined inwardly and downwardly from both sides of the frame, there is a W!
Laminate the veneers coated with adhesive with the adhesive-coated side facing down, support the laminated veneers in a concave shape with the support nails, and then (6) place the laminated veneers in a concave-convex mold. By inserting the VC, then pulling out the support claw, dropping the MM veneer into the upper concave mold, and removing the supply frame, the amount of pressure per cycle is reduced compared to the conventional pressure forming method. This has the effect of shortening pressure forming time, improving workability, and reducing costs.

As mentioned in m1, when veneers are laminated inside the supply frame, the edges of the laminated veneers are uneven, and even when the veneers are laminated directly on the lower mold (concave) side as in the conventional method, the end surfaces of the laminated veneers may be uneven. Since the yield of decorative veneers obtained by slicing Furisochi will decrease, an end reference bar is attached to one side edge of the F shape to align the end faces, and the veneer is placed against this reference bar. The aim was to position and improve lamination accuracy. However, the laminated veneer plates are easily displaced, and there is a problem in that the Vc ends are easily shifted due to vibrations when the lower die is conveyed into the press.

Therefore, as shown in FIG. 6, a quick-curing adhesive 16 is applied to one end edge of the veneer 11' using a roll coater 17 to soften the veneers together during lamination. When the laminated veneer 12' is press-formed, the adhesive 18 for integrally VC bonding the laminated veneer 12' is applied with a roll coater 19 on the entire surface, and the position of the laminated veneer 12 is determined by the end face reference bar 20 during lamination. By adhering the veneers 11' to each other with fast-curing adhesive 16 in this state, it is possible to prevent displacement of the veneer 11' and improve lamination accuracy.

Furthermore, as shown in FIG. 7, when a large number of rotary-cut veneers 111 with different widths are stacked on the pallet 21, the veneers 111 may become loose on the pallet 21 due to vibrations caused by transportation.
There was a problem with it falling off.

That is, as shown in FIG. 7, when the number of veneers stacked on the bar 21 increases, the slope of the stacking pile increases, causing narrow width (about 360 mm) veneers to slip down.

Therefore, as shown in FIG. 8, both lengthwise ends 22a.

By using a pallet 21' with the veneer 22b raised up and both ends 22a and 22b curved in the shape of a recess in the width direction, the veneer 111' is loaded onto the valley y) 21'-hi of C. The plate 111' is concavely curved 1~ as shown in FIG.
When viewed from the direction, as shown in Figure 9 1b+, both ends of the veneer in the length direction (fiber direction) are bent, which prevents the veneer from sagging in the width direction and prevents the stacked veneers from sagging in the width direction. Board 111
′ is eliminated.

In addition, when stacking the veneers into the supply frame in the above-mentioned embodiment, when stacking the veneers into the usual concave mold (lower mold) of a certain LA, the veneers are not laminated one by one in close contact with each other. As shown in Figure 1O, a bulge D is formed, which is the thickness of the laminated veneer.
'1. was causing

Therefore, as shown in FIG. 11 181 and Tbl, when laminating veneers in a concave shape 23.1:, for example, 111 layers of veneers 112 are fixed to the concave shape 23J: with a gran 124, and from the t edge of the concave shape approximately 10w, fixed at position h), one edge of the concave mold 23 and the fixed veneer 112 nozzle/L
Insert the /25 and blow air into the mold shape at high speed. In this way, the upper part is closed by the veneer 112, and the inside of the mold rL becomes negative pressure P2, and the veneer becomes the concave mold 23J:
is pressed by atmospheric pressure P1. the result,
The veneer 112 can be laminated along the curved shape (9) VC of the concave mold 23 with high precision and without causing any bulges or deviations.

Still another method for preventing displacement of laminated veneers will be described. That is, as shown in Fig. 12, the concave mold (lower mold)
26 does not necessarily have the bottommost portion 26a at its center, but it is normal that there is some deviation. Therefore, on such a concave 26! Even if the veneers 113 are stacked with their end faces aligned as shown in Figure 13, 1al K, the veneers will shift under their own weight due to adhesive slippage, etc., resulting in uneven veneers during pressure forming, as shown in Figure 9, 1b+. This caused a decrease in yield.

Therefore, as shown in FIG. 14, 18+ and lbl, a flat plate 27 is placed on the concave mold 26', a veneer 113' is laminated thereon, and a backing material 28 is placed on the side surface to align the end faces of the laminated veneer. guess. After lamination, the flat plate 27 is pulled out, the laminated veneer 29 is dropped onto the concave mold 26', and the front panel member 2 is
The laminated veneer 29 is forcibly curved by tightening the interval Ll of B to L2, and is press-formed with the convex Wi 30.

(10) If the flat plate 27 is simply pulled out, the laminated veneer 291d
@15 Although the veneer 1 is only curved as shown in the figure, by forcibly curving the laminated veneer 29 with the backing material 28,
By creating a relative shift between the laminates 13', a laminated veneer 29 having a desired curvature can be obtained with high precision.

[Brief explanation of drawings]

Fig. 1 is an explanatory diagram showing a conventional method of pressure forming laminated veneers, Fig. 2 is an explanatory diagram showing an embodiment of the present invention, and Fig. 3 is an explanatory diagram showing a method of laminating veneers on a supply frame. FIG. 4 is a front view showing an example of the state in which the laminated veneer is held by the support claws; FIG. 5 is a front view showing an example of each of the support claws; FIG. Figure 7 is a front view showing how veneers are loaded on a normal barre lift, and Figure 8 is a diagram showing an example of a method for preventing slipping of veneers. Perspective view showing an example, FIG. 9 1a
l and fbl are a front view and a side view, respectively, of the veneers loaded on the barre lift in Fig. 8, as seen from the arrow entry direction and the arrow B direction. Cross-sectional view showing the method, FIG. 11 la and fb
l is an explanatory diagram showing an example of a laminating method to prevent bulging and shifting of veneers during lamination, Fig. 12 is a perspective view showing a normal concave type, and Fig. 13 181 and fbl are normal An explanatory diagram showing the occurrence of misalignment in a laminated veneer, @1
FIG. 4 is an explanatory diagram showing an example of a lamination method for preventing the occurrence of misalignment of fal and fbl, and FIG. 15 is an explanatory diagram showing the curved shape of a laminated veneer that is merely curved. 8... Support claw, 9... Supply frame body, 10... Whipping agent applied surface, 11... Veneer, 12... Laminated veneer, 13a
... Concave type, 13b... Convex type □ JP-A-59-11202 (6) Fig. 10 777 colors (a)

Claims (1)

[Scope of Claims] (1) A veneer coated with adhesive on one side is placed in a supply frame having a pair of support claws at the bottom thereof, each of which is inclined downwardly inwardly. The laminated veneers are laminated with the adhesive coated side facing down, and the laminated veneers are curved and supported in a concave shape by the support claws, and then the laminated veneers are inserted into the concave-convex mold, and then the support claws are A method for pressure forming a laminated veneer, which comprises pulling out the laminated veneer, dropping the laminated veneer onto a concave mold at the bottom, removing a supply frame body, and performing pressure forming. +21 If one edge of the veneer is coated with a fast-curing adhesive that firmly bonds the veneers to each other during lamination, and the laminated veneer is applied to almost the entire surface except for the one edge when the laminated veneer is pressure-formed. Claim 111: Applying adhesive to bond together
Pressure forming method of laminated veneer as described in . (3) Valley J in which the veneer has both ends in the length direction upright and both ends curved in the width direction (in a concave shape)
The veneer is loaded on the board, and the veneer is taken out from the
! Claims of applying a cleaning agent and layering it within the supply frame @
11) The method for pressure forming a laminated veneer according to item 11). 141 Grip the veneer with a crimp and fix it to the upper surface of the supply frame, blow air into the frame from between the supply frame and the veneer, and press the veneer against the support claws at the bottom of the frame. A method for pressure forming a laminated veneer according to claim 11, characterized in that the veneer is a veneer.