JPH058201A - Manufacture of veneer sheet - Google Patents

Abstract

PURPOSE:To constitute the a method to manufacture a fancy veneer sheet continuously on a line. CONSTITUTION:This method is in constitution comprised of a process superposing a long-sized and beltlike base sheet 2 upon a long-sized and beltlike peeling sheet 3 and transferring intermittently both the sheets, a process forming an adhesive layer on the base sheet 2, a process superposing a natural fancy veneer upon the base sheet 2 for temporary adhesion, a process forming a fancy veneer sheet 17 which is integrated by sticking the base sheet 2 and natural fancy veneer 12 on the peeling sheet 3 by performing hot pressing of a laminated body of the peeling sheet 3, base sheet 2 and a fancy veneer and a process peeling the peeling sheet 3 off from the fancy veneer sheet 17.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing a natural veneer sheet to be attached to the surface of wooden boards such as furniture.

[0002]

2. Description of the Related Art Conventionally, a sliced veneer obtained by slicing natural wood has an extremely thin wall thickness of, for example, about 0.2 mm. A laminate of a base sheet and a veneer is provided as a "veneer sheet".

As a conventional method for producing such a veneer sheet, a large number of plywood having a predetermined size are used, the base sheet is polymerized on each plywood, and a natural veneer is further adhesively polymerized on the base sheet. By inserting the laminated body of plywood, base sheet, and veneer into a hot press to obtain a veneer sheet in which the base sheet and the veneer are bonded and integrated on the plywood, and then peeling the veneer sheet from the plywood It is practiced to obtain veneer sheet products with dimensions.

[0004]

In the conventional manufacturing method,
Since the veneer sheet is formed on the plywood for each one, it is necessary to separately manufacture the individual veneer sheets on each plywood while using a large number of plywoods. For this reason, work efficiency is low, productivity cannot be improved, and when mass production is intended, it is necessary to work on many plywoods in parallel at the same time, so a large work area and a large number of workers are required. Therefore, the cost cannot be reduced.

Further, since the laminated body of the plywood, the base sheet and the veneer destined for each one must be loaded into the hot press, dedicated personnel are required for the loading work, and heavy labor is required. It has the disadvantage of being dangerous.

[0006]

The present invention provides a method for manufacturing a veneer sheet, which solves the above-mentioned problems in the prior art, and is constituted as a means thereof. A step of polymerizing a long strip base sheet on the sheet and the step of intermittently transferring both sheets, a step of forming an adhesive layer on the base sheet, and a step of polymerizing a natural veneer on the base sheet and temporarily adhering them. And a step of forming a veneer sheet in which the base sheet and the natural veneer are bonded and integrated on the release sheet by hot pressing the laminated sheet of the polymerized release sheet, base sheet and veneer, and from the veneer sheet This is a step of peeling the release sheet.

[0007]

Embodiments of the present invention will be described in detail below with reference to the drawings.

In FIG. 1, feeding means A, working means B,
The pressing means C and the winding means D are shown separately for the sake of space, but they are arranged continuously in series to form one line.

The feeding means A has a roll 1a of the lead sheet 1, a roll 2a of the base sheet 2 and a roll 3a of the release sheet 3, and each of the sheets fed out as shown by the arrow in the figure. Then, it is guided to the winding means D through the working means B and the pressing means C via a transfer roller and / or a tension roller as appropriate.

The lead sheet 1 is made of, for example, a long belt-shaped kraft paper, and is used only in the initial preparation stage for operating the apparatus as described later, and is unnecessary during the operation.

The base sheet 2 is, for example, a long strip-shaped sheet obtained by impregnating a thin non-woven fabric with a thermoplastic synthetic resin.

The release sheet 3 is, for example, a long strip-shaped sheet of a thin synthetic resin film whose surface is subjected to a release treatment such as coating with a release agent, and is stretched in the longitudinal direction of the strip. It is preferable to have toughness.

At least one roller among the rollers constituting the feeding means A constitutes a feeding roller 4 which is driven and rotated by a driving source such as a motor. Further, the winding means D also constitutes winding rollers 5 and 6 which are similarly driven and rotated by a drive source such as a motor. However, in the present invention, the transfer of each sheet must be an intermittent transfer, and an intermittent transfer means is provided for this purpose. Such an intermittent transfer means can be composed of, for example, an operation switch for turning on and off the drive source. In addition, a servo motor is adopted as a drive source,
An automatic intermittent mechanism for driving and stopping for a predetermined time based on the stored information may be configured.

The feeding means A has an adhesive applying means 7
Have been deployed. In the case of the illustrated embodiment, the adhesive applying means 7 is constituted by the gluing roller 8 which is in contact with the feeding roller 4 and the doctor roller 9 which supplies the adhesive to the gluing roller 8, as shown in FIG. In addition, the advancing and retracting means 1 such as a cylinder for separating the adhesive applying means 7 from the feeding roller 4
0 is provided. That is, the advancing / retreating means 10 moves the adhesive applying means 7 backward so as to be separated from the feeding roller 4 while the above-described sheet feeding is stopped, while the adhesive applying means 7 pulls out the adhesive applying means 7 during the sheet feeding. Move forward so that it presses against.

The working means B constitutes a working table 11. The work table 11 has a smooth surface so that the above-mentioned sheet can be transferred. Preferably, the surface part is made of a transparent or translucent plate such as a glass plate or an acrylic plate, It has a light source such as a fluorescent lamp at the bottom. Thus, in the working means B, the operator can see through the sheet on the work table 11 by the light from the light source, and facilitate the later-described superpositioning work of the natural veneer.

Natural veneer 1 used in working means B
Reference numeral 2 is an ultrathin sheet obtained by slicing a natural tree to a thickness of about 0.2 mm, which is preliminarily cut into strips each having a predetermined size.

The pressing means C is composed of a hot press 13 which is a thermal mold. In the case of the illustrated example, the upper mold 1
The cylinder 5 is configured to be movable up and down by the cylinder 14, and the lower mold 16 is fixed. This hot press 13 is, for example, about 8
It is heated to 0 to 120 degrees Celsius and pressed at a pressure of about 4 kg / cm ² for about 40 seconds to 1 minute.

The winding means D has the above-mentioned winding rollers 5 and 6, one of the winding rollers 5 winds the lead sheet 1 and / or the release sheet 3, and the other winding roller 6 makes it described later. The veneer sheet 17 is wound.

An embodiment of the method of the present invention will be described in the order of steps based on the above means A, B, C and D.

(Preparation Step) First, before the base sheet 2 and the release sheet 3 are unrolled from the rolls 2a and 3a and wound on the winding rollers 6 and 5, the lead sheet 1 is wound. That is, as shown in FIG. 2, the lead sheet 1 is unwound from the roll 1a and wound by the winding roller 5 via a predetermined sheet transfer path.

Then, the lead sheet 1 is cut and separated from the roll 1a, and the base sheet 2 and the release sheet 3 are separated.
The feeding ends from the rolls 2a and 3a are adhered to the lead sheet 1 with an adhesive tape or the like, and in this state, the winding roller 5
To drive.

When the base sheet 2 and the release sheet 3 pulled by the lead sheet 1 spread over the work table 11, the implementation of the method of the present invention is started. After the start of implementation, the base sheet 2 (the veneer sheet 17 including the base sheet 2) and the release sheet 3 sent to the winding means D are
It is connected on each roller 6 and 5 so as to be wound by the winding roller 6 and 5, respectively.

Therefore, the lead sheet 1 guides the base sheet 2 and the release sheet 3 in the transport direction, and the production of the veneer sheet 17 can be started from the feeding end portion of both sheets 1 and 2, so that both sheets 1 and 2 can be started. Does not produce wasteful waste materials. In particular, since the base sheet 2 is relatively expensive, it is advantageous in terms of cost that waste material is not generated when it is passed over a long production line.

(Sheet Polymerization Step) As shown in FIGS. 1 and 3, in the feeding means A, the release sheet 3 fed from the roll 3a passes through the transfer roller and / or the tension roller, and then the work table in the working means B. 11 is transferred intermittently. On the other hand, the base sheet 2 delivered from the roll 2 a passes through the delivery roller 4 and the adhesive applying means 7 via the transfer roller and / or the tension roller, and is superposed on the release sheet 3.

(Adhesive Layer Forming Step) The adhesive applying means 7
When passing through, the adhesive is applied to the surface of the base sheet 2 to form the adhesive layer 18. By the way, in the illustrated embodiment, the sheet polymerization step is constituted after the adhesive layer forming step, but the order of both steps may be reversed. That is, the base sheet 2 may be polymerized on the release sheet 3 first, and then the adhesive may be applied to the base sheet 2. Alternatively, the roll 2 of the base sheet 2 to which an adhesive has been applied in advance without providing an adhesive layer forming step in the manufacturing line.
It is also possible to implement the present invention using a.

(Veneer polymerization process) In the working means B,
The natural veneer 12 is polymerized on the base sheet 2 by manual work, and is temporarily bonded via the adhesive layer 18. For this reason,
During this operation, the sheet transfer is stopped. In the example shown in FIG. 4, a narrow guide sheet 19 made of the same material as the base sheet 2 is attached on the base sheet 2 at the center in the width direction, and is placed on both sides of the guide sheet 19. The natural veneer plates 12 are attached to the base sheet 2 in a plurality of rows. As a result, the veneer sheet 17 formed through the subsequent hot pressing has the first veneer sheet 17a and the second veneer sheet 17b on both sides with the guide sheet 19 interposed therebetween.
Will be formed at the same time.

In this veneer stacking step, as described above, the laminate 20 of the release sheet 3, the base sheet 2, and the natural veneer 12 on the work table 11 is irradiated with light from below and is in a light-transmitting state. The work of accurately attaching the projecting plates 12 to a predetermined position is easy, and the closely arraying work can be facilitated without forming a gap between adjacent projecting plates 12.

Since this veneer sheet superimposing step has an important influence on the finish of the veneer sheet 17 to be formed later,
It is preferable to perform it manually, but it may be automated by mechanical means such as a robot finger.

(Hot Pressing Step) The laminated body 20 obtained by the working means B is sent to the pressing means C by the sheet transfer, and hot pressed by the hot press 16 while the transfer is stopped.

By this hot pressing, as shown in FIG.
As shown in (B), the adhesive layer 1 in the laminate 20.
8 is diffused and impregnated in both the base sheet 2 and the projecting plate 12 to integrate the projecting plate 12 and the base sheet 2. At this time, the laminated body 20 is entirely pressed, but the release sheet 3 is not integrated because it is subjected to a release treatment. Therefore, as a result, the projecting plate sheet 17 in which the base sheet 2 and the projecting plate 12 are integrally bonded is formed on the release sheet 3.

(Peeling Step) The laminated body of the peeling sheet 3 and the veneer sheet 17 formed by hot pressing is sent to the winding means D by sheet transfer as shown in FIGS. 1 and 5C. The release sheet 3 from the lower surface of the veneer sheet 17.
Can be peeled off. That is, the release sheet 3 is wound around the winding roller 5, while the projecting plate sheet 17 is wound around the winding roller 6, so that the release sheet 3 is peeled off.

(Subsequent Steps) The veneer sheet 17 manufactured and wound up as described above is then smoothed by polishing the surface of the veneer sheet 17 with a buff or the like, if necessary, and at the same time in the width direction. The guide sheet 19 at the central portion is cut by a slitter, and divided into a first veneer sheet 17a and a second veneer sheet 17b. Thus, this veneer sheet is provided for woodworking, cut into an appropriate shape and dimension, and attached to the surface of a wooden board such as furniture as in the conventional case.

[0033]

According to the present invention, since the veneer sheet can be continuously manufactured, the work efficiency is high, the productivity is improved, and the mass production is possible. Moreover, since the veneer sheet is manufactured on the strip-shaped continuous body, it is possible to automate the hot pressing, which has an effect of greatly contributing to the labor saving of the manufacturing line.

[Brief description of drawings]

FIG. 1 is an explanatory view showing one embodiment of the method of the present invention in the order of each step.

FIG. 2 is an explanatory diagram showing a preparation step of the method of the present invention.

FIG. 3 is a perspective view showing the feeding means in the method of the present invention with a part thereof cut away.

FIG. 4 is a perspective view showing a veneer polymerization process in the method of the present invention.

FIG. 5 shows a cross section of the laminate in the veneer polymerization step, hot pressing step and peeling step of the method of the present invention, (A) is an enlarged cross-sectional view of the laminate in the veneer polymerization step, and (B) is a hot pressing step. FIG. 3C is an enlarged vertical sectional view of the laminated body in FIG.

[Explanation of symbols]

 2 Base Sheet 3 Release Sheet 5 Winding Roller 6 Winding Roller 7 Adhesive Application Means 11 Work Table 12 Natural Veneer 13 Hot Press 17 Veneer Sheet 17a First Veneer Sheet 17b Second Veneer Sheet 18 Adhesive Layer

Claims (1)

Claim: What is claimed is: 1. A step of polymerizing a long strip base sheet on a long strip release sheet and intermittently transferring both sheets, and a step of forming an adhesive layer on the base sheet. And a step of polymerizing and temporarily adhering the natural veneer onto the base sheet, and hot pressing the laminated sheet of the polymerized release sheet, base sheet and veneer to bond the base sheet and the natural veneer on the release sheet. A method for manufacturing a veneer sheet, comprising: a step of forming an integrated veneer sheet; and a step of peeling a release sheet from the veneer sheet.