JPH0712601B2 - Method of manufacturing backing veneer sheet - Google Patents

Description

TECHNICAL FIELD The present invention relates to a backing decorative veneer sheet mainly used as a surface decorative material for wooden building materials, and more specifically, as a reinforcing material on the back surface of a thin wooden veneer. The present invention relates to a method for manufacturing a backing decorative veneer sheet in which a backing sheet is laminated and integrated.

2. Description of the Related Art In recent years, due to the depletion and soaring of high-quality natural wood materials, it is possible to obtain high-quality natural wood materials by attaching them to the surface of plywood, laminated wood, etc. It is generally widely practiced to form wood decorative surfaces.

However, since the decorative veneer as described above is an extremely thin one having a thickness of about 0.2 to 0.8 mm, when it is handled alone, it may be easily broken, broken, wrinkled or otherwise damaged. It is also difficult to attach the material to the base material.

For this reason, it has been widely practiced to put a backing sheet of non-woven fabric, paper or the like as a reinforcing material on the back surface of such a veneered veneer in advance and put it to practical use as a laminated backing veneered sheet. Has been adopted.

Then, as a method for attaching the decorative veneer and the backing sheet for the production of this backing veneer sheet, either the backing sheet or the decorative veneer is used, and in many cases, it is directly attached to one side of the backing sheet side. After applying the agent, the mating members are overlapped with each other, and they are pressure-bonded and integrated by cold pressure and heat pressure. Known examples of these specific methods can be found in, for example, JP-A-63-188001, JP-A-62-25004 and JP-B-64-2058.

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention However, the above-described method for producing a backing decorative veneer sheet has various problems as described below.

First, when the backing sheet is pasted after applying the adhesive directly to the decorative veneer side, the veneer absorbs moisture and solvent in the adhesive after the adhesive is applied. In addition to causing harmful deformation such as curling and shaving, it becomes difficult to attach the backing sheet to the backing sheet. May be polluted. For this reason, in many cases
After applying an adhesive to the backing sheet side, a decorative veneer is attached to this, but even in this case,
Not only does the adhesive penetrate into the backing sheet, and the adhesive may blow out to the opposite side of the coated surface, but it also swells the backing sheet made of non-woven fabric or paper, causing wrinkles and tears, and also sticking a decorative veneer. It becomes difficult to perform the matching work. Also, when the decorative veneer is pasted on the wrinkled backing sheet, not only the backing veneer sheet itself of the product becomes unsightly with wrinkles on the surface, but also stuck to the base material. In this case, there is a problem that defective adhesion tends to occur at the wrinkled portion of the back surface.

Furthermore, as described above, when the adhesive is applied to the backing sheet, it penetrates deeply into the backing sheet, so that the backing sheet becomes hard as the adhesive hardens, and the backing sheet with a decorative veneer attached is applied. The plate sheet itself has poor flexibility and is highly rigid. For this reason, it is not only difficult to wind the lined decorative veneer sheet into a roll state for transportation and storage, but also when it is used, it is attached in a bent state to a bent portion or a corner portion of the base material. In this case, the veneer sheet is difficult to bend along the surface of the base material, and as a result, a raised portion due to improper contact is generated, or cracks are generated, and a good finished state of the decorative surface cannot be obtained. There was such a problem.

On the other hand, as a measure to prevent wrinkling of the backing material as described above, conventionally, a backing sheet such as a non-woven fabric is heated with a heating roller to apply an adhesive, and a decorative veneer is attached in a gel state of the adhesive. Improvement means have been proposed (for example, JP-A-63-341).
36, JP-A-63-249601). This improving means can be evaluated as effective for the desired prevention of wrinkles, but it cannot prevent the penetration of the adhesive into the backing sheet in the process of gelling after the application of the adhesive. Therefore, it is impossible to prevent the curing of the backing sheet based on the above-mentioned adhesive impregnation curing and the deterioration of the flexibility of the backing decorative veneer sheet, and it is difficult to store it in a wound state. In addition, the problem that the workability is inferior cannot be eliminated.

The present invention further solves the above problems, that is, the backing sheet and the decorative veneer can be easily and reliably bonded to each other without wrinkling, and at the same time, bonded It is an object of the present invention to prevent a backing sheet and a decorative veneer from becoming highly rigid due to the permeation of the agent, and to obtain a backing decorative veneer sheet which is flexible and has excellent workability.

Means for Solving the Problems In the above-mentioned object, the present invention applies an adhesive to the surface of a release sheet having a non-adhesive surface, and water contained in the adhesive, and a semi-dried state by volatilizing a solvent. After that, a backing sheet or a wooden decorative veneer is laminated and adhered on the semi-dry adhesive layer, and then the release sheet is peeled and removed to transfer the adhesive layer to the backing sheet or the wooden decorative veneer side. A method for producing a backing decorative veneer sheet is characterized in that the veneered veneer sheet or the backing sheet is superposed on the exposed surface of the adhesive layer, and the veneered backing sheet and the backing sheet are adhered together.

This will be described in more detail below with reference to the accompanying drawings.

In the first step, first, as shown in FIG. 1, the adhesive (2) is applied to the surface of the release sheet (1).

The release sheet (1) used here is not particularly limited in material, thickness, etc. as long as it is a sheet having a non-adhesive release surface, and specifically, for example, a fluororesin, In addition to paper, non-woven fabric, etc., the surface of which is subjected to release treatment with silicone resin, release resin / film or sheet of fluorine resin, silicone resin, polyethylene or the like, or a composite sheet obtained by laminating them can be used. .

Further, the adhesive (2) is used as a concept including a pressure-sensitive adhesive as its term, and is preferably one that forms a flexible resin film after curing, such as vinyl acetate resin,
Ethylene vinyl acetate co-condensation resin system, water-based vinyl urethane resin system, acid-curable vinyl acetate resin system, urethane resin system,
A urethane-modified vinyl acetate resin-based material, a rubber-based material, an acrylic resin-based material, or the like can be preferably used. However, it is not limited to these, and depending on the application, a thermosetting adhesive such as a urea resin-based adhesive, a melamine resin-based adhesive, a phenol resin-based adhesive, a urea melamine co-condensed resin-based adhesive, or an epoxy resin-based adhesive is used. Is also acceptable.

For the application of the adhesive to the release sheet (1), it is advantageous in efficiency that a continuous release sheet is unrolled from its winding roll and continuously applied with a roll coater or the like. It may be applied individually to release sheets cut into predetermined dimensions. The application amount of the adhesive depends on the kind of the adhesive, but is generally about 100 to 250 g / m ² , particularly 150 to 200 g / m ² , and is generally about.

Next, in a second step, the adhesive (2) is semi-dried (se
Dry to the mi-dry) state. This semi-dry means
Moisture or solvent content contained in the adhesive is volatilized to some extent, and the penetration into non-woven fabric or paper used as a backing sheet or wood decorative veneer is sufficiently suppressed, regardless of the state of incomplete curing or the degree of curing. Desirably, it means a concept including a dry state that retains a certain degree of tackiness on the surface and has a so-called heat-recovery property that activates by heating to develop an adhesive force. The treatment method for semi-drying is not particularly limited, and includes leaving at room temperature for a predetermined time, but generally, using a dryer, positive ventilation such as blowing, infrared irradiation, far infrared irradiation, etc. For efficiency, it is preferable to perform a drying treatment.

Next, as a third step, as shown in FIG. 2, the backing sheet (3) or the decorative veneer is laminated on the adhesive (2) layer which has been in the semi-dried state as described above, and this is cold-pressed. Laminate. As the member to be bonded to the adhesive layer in this step, either the backing sheet (3) or the decorative veneer to be laminated with each other as described above may be used, but generally, the backing sheet is relatively stronger. It is preferable in terms of work because it is excellent and hardly breaks or tears. As the backing sheet (3) used here, any conventionally known backing material can be arbitrarily selected and used.
For example, papers such as Japanese paper and kraft paper, synthetic resin fibers such as polyester and nylon, non-woven fabrics such as natural fibers and inorganic fibers, woven fabrics thereof, synthetic resin films or sheets, and two or more materials thereof. A laminated composite sheet according to can be used. Further, the above-mentioned laminating means may be one in which the adhesive (2) is temporarily attached to the backing sheet (3) or the decorative veneer side, and therefore it can be suitably carried out by cold pressing with a roll press, for example.
Then, in the case of temporarily storing in this state, it is temporarily wound into a roll state as necessary, but this is not a necessary item in the present invention.

Next, as the fourth item, as shown in a part of FIG. 2, the release sheet (1) is peeled off, and the adhesive (2) layer in a semi-dried state is removed to remove the backing sheet (3). ) Side or the decorative veneer side.

Then, as a fifth step, as shown in FIG. 3, the decorative veneer (4) or the backing sheet (3) as a mating member is overlaid on the adhesive (2) layer exposed as described above, and heat is applied. And backing sheet (3) and decorative veneer (4) are bonded and integrated by compressing them while cold or cold to develop the original adhesive force of the adhesive layer, and the backing decorative veneer sheet (5) as a product ) Get. The decorative veneer (4) used here is not limited to a single piece of wood veneer, but may be laminated veneer, artificial grain veneer, horizontal perforated veneer, continuous veneer by vertical splicing, etc. Is a dry veneer with a water content of 20% or less, which has been subjected to dimensional stabilization treatment, such as acetyl treatment, formal treatment, isocyanate treatment, graft treatment, and impregnation treatment with a polyoxyethylene derivative such as polyethylene glycol or polypropylene glycol. Those which have been subjected to bleaching treatment, alkali treatment, dyeing treatment and the like are used. The thickness of the decorative veneer is not particularly limited, but a thickness of about 0.2 to 0.8 mm is preferably used. In addition, the above-mentioned laminating of the decorative veneer (4) is carried out by using a butt joint on a long backing sheet (3),
The joints may be arranged side by side with no gap using a joint means such as a finger joint or a scarf joint that is inconspicuous, or may be arranged in an intermittent state with a predetermined gap. The joining operation by pressing may be performed by any means, and it may be performed hot or cold depending on the kind of the adhesive by using an arbitrary pressing device such as a flat plate press or a roll press. it can.

The product obtained by the above is substantially coated with the adhesive on the backing sheet and the decorative veneer in a state of being semi-dried in advance by a transfer method, and then adhered. It is possible to obtain a laminate in which the two have been laminated and bonded without penetrating deep into the plate. Therefore, the product is excellent in flexibility, and it is possible to obtain a product which can be wound into a roll and stored and transported without any trouble.

Next, an example of continuously carrying out the above-mentioned manufacturing method according to the present invention will be described with reference to FIGS. 3 and 4.

First, referring to FIG. 4, a release sheet (1) having one side subjected to a release treatment is continuously fed from a release sheet roll (1a) to a non-adhesive release treated surface. The adhesive (2) is applied by an adhesive application device (6) such as a mold. Next, the release sheet (1) to which the adhesive has been applied is introduced into a dryer (7) and subjected to a drying treatment to bring the adhesive (2) into a predetermined semi-dried state. Subsequently, a backing sheet (3) such as paper or non-woven fabric is separately fed out from the backing sheet supply roll (3a), and is placed on the release agent sheet (1) on the adhesive (2) side to form a pressure bonding roll (8). Lead between (8) and stick both (1) and (3) together. And after this bonding,
Once wound into a roll, make a backing material roll with adhesive (10).

Next, as shown in FIG. 5, after pulling out the backing sheet (3) having the release sheet (1) attached thereto from the adhesive-backed backing material roll (10), the release sheet (1) is pulled from one end. )
Is taken up on a take-up roll (1b) and peeled off, and the adhesive (2) layer is transferred to the backing sheet (3) side. Then, the wooden decorative veneers (4) are placed side by side on the exposed surface of the adhesive (2) on the backing sheet (3) without any space therebetween, and heat-pressed by a press machine (11) to apply the decorative veneer. (4) and the backing sheet (3) are bonded and integrated to obtain a backing decorative veneer sheet (5) as a product. And the veneer sheet (5)
Shall be wound up on a roll (12) and stored and transported.

In the above description, the laminate of the release sheet (1) and the backing sheet (3) was once wound on the roll (10), but the release of the next step is continuously performed without winding it. The sheet (1) may be sent to the peeling step and carried out in a series of lines.

EFFECTS OF THE INVENTION According to the present invention, as described above, the adhesive is once applied onto the release sheet, and after semi-drying it, the adhesive is transferred to the backing sheet or the decorative veneer. In the step of applying the adhesive, the adhesive does not penetrate deeply into the backing sheet or the decorative veneer due to water content or solvent content. Therefore, wrinkling due to swelling of these members does not occur, and they can be easily and accurately bonded to each other without any trouble, and a uniform backing decorative veneer sheet with no quality defects is provided. Obtainable.

Also, in the state of the product in which the backing sheet and the decorative veneer are laminated, the adhesive layer mainly exists mainly at the joint interface of both members or in the vicinity thereof, and most of their thickness is impregnated with the adhesive. Since the part which is not applied is retained, the member itself is not hardened due to the impregnation and hardening of the adhesive.
Therefore, it is possible to obtain a highly flexible product, and it is possible to wind it into a roll for storage and the like without any trouble, and at the time of use, easily bend it along the corners of the base material. As in the case of a conventional product having high rigidity, a good makeup finish can be obtained without causing partial adhesion failure, floating portion, or cracking. Furthermore, as described above, the adhesive hardly penetrates into the decorative veneer, and it is possible to almost certainly prevent the adhesive from blowing on the surface of the veneer.Thus, after polishing the surface with a sander etc., the colorant is applied. Even when you do
A beautiful colored finished state can be obtained without causing uneven coloring due to partial blowing of the adhesive.

Examples Example 1 A water-based vinyl urethane resin adhesive was applied to a non-adhesive release-treated surface of a release paper having a release treatment on one side, using a roll-type adhesive application device. This coating material was approximately 200 g / m ² . Next, the release paper to which the adhesive had been applied was introduced into a dryer and subjected to a drying treatment at 100 ° C. for 1 minute to make the adhesive a predetermined semi-dried state. Subsequently, a polyester non-woven fabric (13) having a basis weight of 23 g / m ² was separately used as a backing material, which was superposed on the adhesive surface of the release paper and guided between a pair of pressure-bonding rolls to bond the two. Then, after this bonding, it was once wound into a roll.

Next, as shown in FIG. 5, the non-woven fabric with release paper is pulled out from the roll, and the release paper is peeled off from one end,
The adhesive layer was transferred to the non-woven fabric side. Then, it was transferred to the non-woven fabric side. Then, on the exposed surface of the adhesive on this non-woven fabric, a wood decorative veneer with a thickness of 0.3 mm is placed side by side without a gap, and a temperature of 150 ° C. is set by a hot roll press machine.
Then, the decorative veneer and the nonwoven fabric were bonded and integrated by heating and pressing with, to obtain a backing decorative veneer sheet as a product. The veneer sheet can be sequentially wound on rolls for storage and transportation.

The backing decorative veneer sheet obtained by this example is a non-woven fabric as a backing material, and the permeation of the adhesive from the adhesive surface of the decorative veneer is slightly recognized in the vicinity of the adhesive interface, its deep layer. No permeation was observed, and no blowout of the adhesive was observed on the outer surface. Moreover, when compared with the products obtained in the comparative examples described later, the products were highly flexible as a whole. Then, as shown in FIG. 6, this is put on the upper surface and both side surfaces of the base material (21) having chamfered corner portions (22) having an angle of about 45 ° on both side edges, and acetic acid on the surfaces beforehand. When applied after applying a vinyl resin adhesive, it can be easily and accurately bent along the above corners, and it can be applied in a beautiful finished state without floating or cracking. there were.

Example 2 A release-treated surface of a release paper was coated with a urethane-modified vinyl resin adhesive at a rate of 150 g / m ² and passed through a dryer at 70 ° C. for 3 minutes to make the adhesive semi-dried. did. Then, a 0.3 mm thick wood veneer veneer was laminated on the semi-dry adhesive layer so as to be aligned without any space, and then the release paper was peeled off to transfer the adhesive to the veneer side.

Then, the decorative veneer with the semi-dry adhesive is placed so as to be sequentially laid on a long strip-shaped non-woven fabric as a backing material that is continuously guided separately, and the temperature is set to 130 by hot pressing.
° C., a pressure 1 kg / cm ^2, and heated pressing under the conditions of time 10 seconds, to obtain a desired be backed decorative veneer sheet.

Also in the case of Example 2, the decorative veneer can be properly bonded to the backing material while maintaining a good flat state without wrinkling. Further, the product was excellent in flexibility as in Example 1, and had no defects on the surface due to blowing of the adhesive or the like.

Comparative Example A nonwoven fabric similar to that used as the backing material in Example 1 was coated with a water-based vinyl urethane resin adhesive at 130 g / m with a roll coater.
Apply to the ratio of ² and immediately put 0.25m thick on the adhesive tank.
M decorative veneers were stacked and heat-pressed to bond them.

In the product obtained by this, blowing out from the conduit part of the veneer to the surface side of the adhesive was observed, and there was a wrinkled part in the nonwoven fabric, and moreover, it was hard as a whole, lacking in flexibility. It was a thing. Then, when this was subjected to an adhesion test on a base material having a corner portion in the same manner as in Example 1, there was swelling due to wrinkles in a part of the flat surface and cracks of the veneer in a part of the corner portion. There was some floating.

[Brief description of drawings]

1 to 3 show the manufacturing method of the present invention in the order of steps. FIG. 1 is a cross-sectional view of a release paper coated with an adhesive, and FIG. 2 is a backing sheet attached to the release sheet. FIG. 3 is a sectional view showing a state where a part of the product is being peeled off, and FIG. 3 is a sectional view showing a product state. Further, FIGS. 4 and 5 are schematic views of a manufacturing apparatus for carrying out the manufacturing method of the present invention, and FIG. 6 is a sectional view showing a sticking test state of a product. (1) …… Release sheet, (2) …… Adhesive, (3) ……
Backing sheet, (4) …… Veneer veneer, (5) …… Product backing veneer sheet.

Claims (1)

[Claims] 1. An adhesive is applied to the surface of a release sheet having a non-adhesive surface, and the water and solvent contained in the adhesive are volatilized to obtain a semi-dried state. The backing sheet or the wood decorative veneer is laminated and adhered, and then the release sheet is peeled and removed to transfer the adhesive layer to the backing sheet or the wood decorative veneer side, and then the exposed surface of the adhesive layer A method for producing a backing decorative veneer sheet, characterized by comprising laminating a decorative veneer or a backing sheet on top of each other and adhering them together.