JPS593670B2 - Method for unwinding and drying continuous veneer and apparatus for carrying out the method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for drying continuous veneers and an apparatus for carrying out the method.

Conventionally, when a roll of continuous veneer wound from rotary lace is dried in a drying oven, it is a single process from the heartwood veneer 3 with a low moisture content around the roll to the sapwood veneer 2 with a high moisture content in the center. The reel was continuously rewound and the empty reel 1 was collected into the veneer winding section on the rotary race side.

Then, at the time when this continuous veneer transitions from the heartwood veneer 3 with a low moisture content to the sapwood veneer 2 with a high moisture content at the center of the rolled ball, the feed speed of the conveyance path is lowered, and the heartwood veneer 3, Efforts have been made to equalize the degree of drying of the sapwood veneer 2.

However, since the conveyance path of the drying oven extends over a fairly long distance, the sapwood veneer 2 and the corewood veneer 3 coexist on the conveyance path at the time when the feed speed is reduced.

Therefore, when the feed speed of the conveyance path is adjusted to match the moisture content of the heartwood veneer, the sapwood veneer 2 becomes undried, and conversely, when the feed speed of the conveyance path is adjusted to match the moisture content of the sapwood veneer, the heartwood veneer 3 becomes undried. It becomes over-dry.

As a result, if it is not dry, it will cause cracking, which will cause poor adhesion, and if it is overdried, it will cause cracks at the ends, waving, etc.

This phenomenon is particularly severe in direct-fire drying ovens with low humidity.

The present invention aims to eliminate these drawbacks of the prior art.

That is, as will be described in detail below, the heartwood veneer 3 and the sapwood veneer 2 are dried by separate conveyance paths 5 and 6 in the drying oven 4, and the feeding speed of the conveyance path 5.8 is adjusted to the sapwood veneer 2, respectively. The water content is set in accordance with the moisture content of the heartwood veneer 3 to ensure uniform drying of the sapwood veneer 2 and the heartwood veneer 3.

Embodiments of the present invention illustrated in the drawings will be described below.

The apparatus of the present invention includes a high-speed rotation conveyance path 5, a low-speed rotation conveyance path 6, a conveyance rail 13, a storage rack 12,
The main components are a reel recovery rail 14, a communication rail 11 that connects the transport rail 13, storage rack 12, and reel recovery rail 14, a core material veneer 3 unwinding device 8, and a sapwood veneer 2 rewinding device 9.

The effect will be explained below.

A rolled ball 7 wound from a rotary race is conveyed along a rolled ball conveying rail 13 from a reel deck glue ring position to a rewinding insertion position of a drying oven 4.

The wound ball 7 has a sapwood veneer 2 wound around the inside of the reel 1 and a heartwood veneer 3 wound around the outside.

The rolled ball 7 is rewound at the rewound insertion position A and transferred onto the high-speed rotation conveyance path 5 in the drying oven 4.

Next, when the insertion of the heartwood veneer 3 onto the high-speed rotating conveyance path 5 is completed, the continuous veneer is cut at the boundary between the heartwood veneer 3 and the sapwood veneer 2.

Then, the rolled ball 10, which has only the sapwood veneer 2, is connected to the connecting rail 1.
1, it is sent to the storage rack 12 and made to stand by in the storage rack 12.

In the drawing, the storage racks 12 are provided in two stages, and the communication rails 11
The storage racks are connected to each other, the transport rail 13, and the reel recovery rail 14, which will be described later, so that balls and reels can be transferred.

The rolled balls 10 that have been kept on standby on the storage rack 12 are sequentially rewound onto the low-speed rotating conveyance path 6 in the drying oven 4 from the sapwood veneer unwinding insertion position B.

When all of the sapwood veneers 10 have been rewound, the qIJ-ru 1 is raised by the connecting rail 11 and moved onto the reel collection rail 14, and is returned to the rotary lace IJ IJ song equipment.

The feeding speeds of the high and low speed transport paths 5, 6'<t are adjusted as appropriate according to the moisture content of the core material veneer 3 and the sap material veneer 2, respectively, but less time is required during the control.

In the above embodiment, the continuous veneer is unwound while being raised upward from the bottom of the drying oven 4, but the winding is lowered from the top to the bottom from the veneer unwinding side of the reel deck. You can also rewind while doing so.

In this case, the upper conveyance path 6 in the drying oven 4 is adjusted to high speed, and the lower conveyance path 5 is adjusted to low speed.

A touch belt conveyor is usually used as the unwinding device 8.9.

A chain conveyor, a backer conveyor, an elevator, etc. are attached to the communication rail 11 to raise and lower the winding balls 7, 10 and the reel 1.

Since the present invention has the above-described configuration, its effects are summarized as follows.

■ Since the heartwood veneer 3 with a low moisture content and the sapwood veneer 2 with a high moisture content are dried separately in the high-speed conveyance path 5 and the low-speed conveyance path 6, the finished moisture content of the heartwood veneer 3 and the sapwood veneer 2 can be reduced. It can be kept evenly.

Therefore, the veneer 2.3 will not become undried or overdried.

Also, compared to the conventional device, the feed speed control of the transport paths 5 and 6 [11]
Since the difference in relative speed between the conveyance path 5゜6 and the veneer being rewound becomes small, the conveyance path 5゜6 pulls the veneer when the speed of the conveyance paths 5, 6 changes, thereby preventing the veneer from tearing. There will be no interruption.

Furthermore, cracks at the end of the wood, waving, poor adhesion between veneers, and tunneling can be prevented.

■ When the present invention is used in a direct flame dryer, moisture generated from the sapwood veneer 2 is supplied to the heartwood veneer 3,
This has the advantage that excessive drying of the core material veneer 3 can be prevented.

(2) Since the sapwood veneer 2 and the heartwood veneer 3 are dried separately, the control width of the speed of the conveyance paths 5 and 6 is small, and the operation is easy.

[Brief explanation of the drawing]

The drawing is a front view of the device of the present invention. 1: Reel, 2: Sapwood veneer, 3: Heartwood veneer, 4: Drying oven, 5: High-speed conveyance path, 6: Low-speed conveyance path, 7: Roll wound with rotary lace, 8: Heartwood veneer board rewinding device,
9: Rewinding device for sapwood veneer, 10: Rolling ball of sapwood veneer 2,
11: Communication rail, 12: Storage rack, 13: Transport rail,
14: Reel recovery rail, A: Rewind insertion position of the winding ball 7, B: Rewind insertion position of the winding ball 10.

Claims (1)

[Claims] 1. A sapwood veneer 2 is placed in the center of the rolled ball, and a heartwood veneer 3 is placed in the periphery.
In the method of drying the veneer in the drying oven 4 while unwinding the rolled veneer 7, only the core veneer 3 of the veneer 7 is wound on the high-speed conveyance path 5 in the drying oven 4. When the heartwood veneer 3 has been returned to dry and has been inserted into the drying oven 4, the boundary between the heartwood veneer 3 and the sapwood veneer 2 is cut, and then only the rolled ball 10 of the sapwood veneer 2 is removed. This continuous veneer drying method is characterized in that, after the sapwood veneer 2 of the rolled bobbin 10 is once transferred to the storage rack 12, the sapwood veneer 2 of the rolled bobbin 10 is rewound and inserted onto the low-speed conveyance path 6 in the drying oven 4. 2 In a device for drying a roll 7 in which a corewood veneer 3 is wrapped around a sapwood veneer 2 in a drying oven 4, a conveying path 5 rotating at high speed for drying the heartwood veneer 3 is provided in the drying oven 4. and a conveyance path 6 that rotates at a low speed for drying the sapwood veneer 2 are provided vertically in parallel, and the unwinding and insertion positions A and B of the veneer into the high-speed rotation conveyance path 5 and the low-speed rotation conveyance path 6 are provided. A continuous veneer drying device characterized in that a storage rack 12 for rolling balls 10 of only sapwood veneers 2 is provided between them.