JP2005088538A - Wood tape and method for producing wood tape - Google Patents

Abstract

The present invention provides a wood tape that can eliminate a joint failure at a butted portion of a serrated joint edge, is less likely to be torn or cracked, and can easily manage material inventory, and a method for manufacturing the same.
A coating layer 15 made of urethane-reactive hot-melt resin is provided on the back surface of a continuous protruding plate 3 in which a plurality of ultrathin protruding plates 1 are abutted via serrated joint edges 1a and 1b of finger joints. As a result, the flexibility and toughness of the wood tape 14 are greatly increased, and tearing and cracking are less likely to occur. Furthermore, since a continuous backing sheet is not used, a large storage space and a large amount of funds for stocking the continuous backing sheet are not required, and inventory management of materials used for manufacturing is easy. It becomes.
[Selection] Figure 1

Description

  The present invention relates to a wood tape having a coating layer on the back surface of a continuous veneer and a method for producing the wood tape.

  A wood tape in which a continuous backing sheet made of nonwoven paper or the like is joined to the back surface of a continuous protruding plate formed by connecting a plurality of ultrathin protruding plates in a row is known (see, for example, Patent Document 1). ).

  This kind of wood tape is attached to the surface of an artificial substrate made of MDF (medium density fiberboard), HDF (high density fiberboard), particle board, plywood, laminated wood, rock wool board, etc. through lapping. As a result, the artificial base material has an appearance as if it is also a solid material, and is therefore widely used as a surface decorative material for artificial base materials constituting furniture and building materials.

In such a wood tape manufacturing method, a sawtooth joint edge forming a male-female relationship is formed between longitudinal ends of a plurality of ultrathin veneers obtained by cutting wood with a woodworking slicer or a rotary race. After forming the continuous protruding plate connected in a row by applying the finger joint processing provided, butting the saw-tooth joint edges together, and sticking the bonding tape to the upper surface of the butting portion to temporarily fix it In a state where the sheet-like backing sheet is run in a tensile state, the adhesive is applied to the upper surface, the continuous protruding plate is supplied from above, and the back surface is superposed on the adhesive application surface. Pressure bonding is performed by passing between roll presses, and then the surface of the continuous protruding plate is ground to remove the bonding tape and adjust the thickness to a predetermined thickness. In this manufacturing method, the butted portion of the serrated joint edge is finally joined by the continuous backing sheet that is back-attached to the back surface of the continuous protruding plate via an adhesive.
Japanese Patent Laid-Open No. 11-129210

  By the way, in the conventional manufacturing method as described above, the plurality of ultra-thin veneers constituting the continuous veneer are obtained by cutting wood with a woodworking slicer or a rotary lace, so that they are completely uniform. It is normal that thickness unevenness is not generated. For this reason, if there is a significant thickness difference at the longitudinal ends of both ultrathin projecting plates that will be connected before and after, an excessive level difference will occur at the butted portion of the serrated joint edge, and the adhesive is applied as described above. Even if pressure bonding is performed by a roll press with a continuous veneer overlaid on the continuous backing sheet, the roll does not come into contact with the corners of the step and sufficient pressing force cannot be obtained. There is a problem in that the continuous backing sheet that connects the butted portions of the joint joints on the back surface is not securely bonded, resulting in poor bonding of the butted portions.

  In addition, the continuous backing sheet used for backing the continuous veneer is an industrial product, and various types with different widths and thicknesses are available depending on the width of the continuous veneer used for manufacturing and the use of wood tape. Must be stocked in large quantities. For this reason, there existed a problem that a large storage space, a large amount of purchase funds, and complicated inventory management were required.

  Furthermore, the conventional wood tape formed by joining a continuous backing sheet to the back of the continuous veneer has low flexibility and strength compared to the surface decorative material made of synthetic resin, and easily breaks and cracks. When handling with a lapping machine, the number of rollers, the angle of the rollers, and the pressing force applied to the rollers are not limited. If the setting is not performed precisely and accurately, the wood tape will be torn, cracked or wrinkled, and there is a problem in that the setting requires a highly skilled technique that can be called a craftsmanship.

  An object of the present invention is to provide a wood tape and a method for producing the same that can solve the conventional problems.

  In the present invention, a plurality of ultra-thin veneers are continuously abutted via the serrated joint edges of finger joints formed at their longitudinal ends, and the back surface of the continuous veneer is urethane-reactive. The wood tape is characterized in that a coating layer made of a hot-melt resin is formed, and the butted portion of the serrated joint edge is joined by the coating layer.

  Further, the present invention is to butt a plurality of ultra-thin projecting plates through the serrated joint edges of finger joints formed at the end portions in the longitudinal direction, and affix the joining tape to the upper surface of the butt portion to temporarily fix Forming a continuous veneer by connecting in a row, and running the continuous veneer in a tensile state, and a urethane-based reactive hot melt resin on the back of the continuous veneer to which no bonding tape is attached Is applied continuously to form a coating layer, a release sheet is supplied to the surface of the coating layer, and the step of pressing with a roll press, the surface of the continuous protruding plate is ground, the joining tape is removed, And a step of adjusting the thickness to a predetermined thickness.

  In the present invention, as described above, a plurality of ultrathin projecting plates are continuously abutted via the serrated joint edges of finger joints formed at their longitudinal ends, and on the back surface of the continuous projecting plate. A wood-based tape, characterized in that a coating layer made of a urethane-based reactive hot-melt resin is formed, and the butted portion of the serrated joint edge is joined by the coating layer, and a urethane-based reactive hot-melt resin After the coating, the coating layer is deposited on the back surface of the continuous veneer by a moisture curing reaction to form a thin, tough and highly flexible coating. As a result, even if there is an excessive level difference at the butt portion of the serrated joint edge, there is no poor bonding of the butt portion due to insufficient pressure applied by the roll press as in the past, and the corner of the level difference The butted portion of the serrated joint edge can be reliably joined by the coating layer to be applied.

  In addition, unlike the conventional configuration, since a continuous backing sheet is not used, a large storage space and a large amount of purchase funds are not required to stock a large amount of the continuous backing sheet, and complicated inventory management is not required. It becomes.

  Furthermore, the flexibility and toughness of the wood tape can be greatly enhanced by the coating layer formed on the back surface of the continuous protruding plate. This makes it difficult for tears and cracks to occur in the wood tape, making it easy to handle, and preventing the tears, cracks or wrinkles from occurring even if the setting of the rollers of the lapping machine is not carried out so strictly. Advanced skill is not required for setting.

  As a method of manufacturing such a wood tape, a plurality of ultrathin protruding plates are abutted through the serrated joint edges of finger joints formed at their longitudinal ends, and a bonding tape is attached to the upper surface of the abutting portion. The process of forming a continuous veneer by connecting in a row by temporarily fixing, and running the continuous veneer in a tensile state, the urethane-based reaction on the back of the continuous veneer without a bonding tape A mold hot melt resin is continuously applied to form a coating layer, a release sheet is supplied to the surface of the coating layer, and the surface is pressed by a roll press. And a step of adjusting the thickness to a predetermined thickness. When a urethane-based reactive hot melt resin is continuously applied to the back of the resin, the urethane-based reactive hot-melt resin, which has quick-drying properties, reacts with moisture in the air and crosslinks, and cures in a semi-solid state within a few seconds. Thus, a coating layer is formed. Then, by supplying a release sheet to the surface of the coating layer in the semi-solid state and sandwiching it with a predetermined pressure by a roll press, the thickness of the coating layer is made uniform and the semi-solid state constituting the coating layer Part of the urethane-based reactive hot melt resin is pushed into the gaps between the fine fibers of the continuous veneer, and the coating strength is increased. Here, the release sheet is a sheet that can be peeled off from the surface of the coating layer that has been completely cured later, and a release paper provided with a synthetic resin sheet or a silicon layer is used as the release sheet. By supplying such a release sheet to the surface of the coating layer that is in a semi-solid state, the coating layer does not adhere to the roll press during clamping by the roll press, and a coating layer is formed on the back surface. In the state where the continuous protruding plate is wound into a roll, mutual bonding of the continuous protruding plate by the coating layer is prevented.

An embodiment of the present invention will be described below with reference to the accompanying drawings.
As shown in FIG. 1, a wood tape 14 according to the present invention is formed by forming a coating layer 15 made of a urethane-based reactive hot melt resin on the back surface of a continuous protruding plate 3.

  The wood tape 14 has a total thickness of about 0.25 to 0.35 mm, and the continuous projecting plate 3 is fingered with a plurality of ultrathin projecting plates 1 (see FIG. 2) made of natural wood and having a thickness of about 0.3 to 0.35 mm. Those connected in a row by a joint are used, and after the coating layer 15 is formed on the back surface thereof, the surface is ground and the thickness is adjusted to about 0.2 to 0.25 mm.

  On the other hand, the thickness of the coating layer 15 is about 0.05 to 0.1 mm, and the urethane-based reactive hot melt resin used for forming the coating layer 15 is suitable for coating a wood surface with a urethane-based reactive hot-melt adhesive. When the resin composition thus modified is applied to the continuous veneer 3 in a heated and melted state, a tough and highly flexible film is formed in a short time by a moisture curing reaction, and after the reaction, it is reheated. However, it does not soften at the original melting temperature, and has excellent wear resistance, scratch resistance, impact resistance, contamination resistance, and weather resistance. As this urethane-based reaction type hot melt resin, for example, hot coating HC717 (manufactured by Kleiberit Japan Co., Ltd.) can be suitably used.

Next, the manufacturing method of the wood tape 14 provided with the said coating layer 15 is demonstrated.
As a manufacturing process of the continuous protruding plate 3, first, an extremely thin protruding plate 1 having a thickness of about 0.3 to 0.35 mm obtained by cutting wood with a woodworking slicer or a rotary race is shown in FIG. As shown, it is cut into a predetermined shape. The width of the ultrathin protruding plate 1 obtained by this shaping is about 100 to 300 mm.

  Finger joints are applied to the ends of the ends of the ultrathin veneer 1 in the longitudinal direction, and as shown in FIG. 2 (b), the male and female relationships between the ends of the ultrathin veneers 1 and 1 to be connected are established. Sawtooth joint edges 1a and 1b are formed. Next, the sawtooth joint edges 1a and 1b are butted together, and a bonding tape 2 made of a paper-based tape is attached to the upper surface of the butted portion as shown in FIG. Are connected in a row to form a continuous protruding plate 3. The continuous protruding plate 3 is wound into a roll shape as it becomes longer.

  The joining tape 2 temporarily fixes the abutting portion until the abutting portions of the sawtooth joint edges 1a and 1b are connected by a coating layer 15 to be described later formed on the back surface of the continuous projecting plate 3. It is removed in the grinding process after connecting the parts.

  A coating layer 15 made of urethane-reactive hot melt resin is formed in the next step on the back surface of the continuous protruding plate 3 formed through the above steps. As shown in FIG. 3, the coating layer 15 is formed in such a manner that the continuous protruding plate 3 is stretched between the feeding machine 20 </ b> A and the winder 21 disposed at predetermined intervals in the front and rear positions, and attached to the feeding machine 20 </ b> A. The roll-shaped continuous projecting plate 3 is run with the back surface of the continuous projecting plate 3 facing upward by being wound up by the winder 21 while being fed out so that the surface to which the bonding tape 2 is attached faces downward. Here, the continuous projecting plate 3 is caused to travel in a tensioned state by rotationally driving the winder 21 in the winding direction and performing rotation control so that the feeder 20A is driven to rotate in an appropriate braking state. .

  The urethane-based reactive hot melt resin is continuously applied by the hot melt application device 17 to the back surface of the continuous protruding plate 3 that travels in a tensile state. A pair of front and rear pressing rods 9c, 9c are arranged at the lower part of the hot melt coating device 17, and the back surface of the continuous protruding plate 3 is made into a slit nozzle 17 'of the hot melt coating device 17 by the pressing rods 9c, 9c. By surface contact, it is possible to satisfactorily apply the urethane-based reactive hot melt resin. When this urethane-based reactive hot melt resin is applied in a heated and melted state at about 140 ° C., it reacts with moisture in the air and immediately begins to cure, and is about 40-60 ° C. in a few seconds (about 6-9 seconds). The coating layer 15 is formed by curing to a semi-solidified state.

  After applying the urethane-based reactive hot melt resin to the back surface of the continuous protruding plate 3 in this way, the roll-shaped release sheet 16 attached to the feeder 20B is supplied while being fed from above, and is enlarged to FIG. As shown in the figure, the release sheet 16 is continuously superposed on the surface of the coating layer 15 in a semi-solidified state and is sandwiched by a pair of upper and lower roll presses 22 and 22 at a predetermined pressure. As a result, the thickness of the coating layer 15 is made uniform, and a part of the semi-solid state urethane-based reactive hot melt resin constituting the coating layer 15 is placed in the gaps between the fine fibers of the continuous protruding plate 3. It is pushed in and the coating strength can be increased. Then, after the release sheet 16 is brought into close contact with the surface of the coating layer 15 by the clamping force between the roll presses 22 and 22 as described above, the release sheet 16 is wound into a roll shape by the winder 21.

  The release sheet 16 is a sheet that can be peeled off from the surface of the coating layer 15 that has been completely cured later. The release sheet 16 is preferably made of a material having damage resistance and high tensile strength. A release paper having a sheet made of synthetic resin such as polyethylene, polypropylene, polyester, nylon, vinyl chloride or the like of about 0.3 mm or a silicon layer is used. In addition, since the adhesive force is attenuated on the surface of the urethane-based reactive hot melt resin that has become a semi-solidified state, even a synthetic resin sheet having no peelability can be used. By supplying such a release sheet 16 to the surface of the coating layer 15 in a semi-solid state, the coating layer 15 does not adhere to the roll presses 22 and 22 when the roll presses 22 and 22 are sandwiched. Further, it is possible to reliably prevent the problem that the continuous protruding plate 3 in the state of being wound in a roll shape is mutually joined by the coating layer 15.

  The continuous protruding plate 3 having the coating layer 15 formed on the back surface in this way is left for a predetermined time in a roll and cured for a predetermined time. After the coating layer 15 is completely cured, the release sheet 16 is removed in the next step. . As shown in FIG. 5, the peeling sheet 16 is removed continuously by attaching the roll-shaped continuous protruding plate 3 to the feeding machine 23 and passing it over the winding machine 24 </ b> A so that the coating layer 15 faces upward. The protruding sheet 3 is fed out and the upward movement is restricted by the free roller 25 so that the release sheet 16 is pulled upward from the surface of the coating layer 15 to be peeled off. The release sheet 16 is rolled by the winder 24B. The continuous protruding plate 3 from which the release sheet 16 has been peeled is wound into a roll by the winder 24A. Note that the release sheet 16 wound up in a roll can be used repeatedly.

  The continuous protruding plate 3 from which the release sheet 16 has been removed by the above process is sent to a grinding process, and the surface thereof is ground by sanding to remove the bonding tape 2, smooth the surface, and the coating layer 15 on the back surface. The thickness is adjusted so that the total thickness including the thickness becomes about 0.25 to 0.35 mm, and is wound into a roll again. By this sanding process, the joint edges 1a and 1b of the ultrathin protruding plates 1 and 1 are almost lost, and the surface of the continuous protruding plate 3 appears to be an appearance of a continuous single plate. Thereafter, the continuous protruding plate 3 is cut into a predetermined width while remaining in a roll shape as necessary. Thereby, the wood tape 14 shown in FIG. 1 is completed.

  In such a configuration, the coating layer 15 made of a urethane-based reactive hot melt resin is applied to the back surface of the continuous veneer 3 by a moisture curing reaction after application, and is a thin, tough and highly flexible coating film. Become. As a result, even if an excessive step is generated at the abutting portions of the serrated joint edges 1a and 1b, the abutting portions of the serrated joint edges 1a and 1b are surely secured by the coating layer 15 that also adheres to the corners of the steps. There is no bonding failure caused by insufficient pressure applied by conventional pressure bonding.

  In addition, unlike a conventional configuration, since a continuous backing sheet is not used, a large storage space for storing a large amount of the continuous backing sheet and a large amount of purchase funds are not required, and materials used for manufacturing are not required. Inventory management becomes easy.

  Furthermore, since the flexibility and toughness of the wood tape 14 can be greatly enhanced by the coating layer 15 formed on the back surface of the continuous protruding plate 3, the wood tape 14 is less likely to be broken or cracked, and easy to handle. At the same time, a highly skilled technique is not required for setting the roller of the lapping machine, and even if the setting is not performed strictly, tearing, cracking, or wrinkle does not occur.

It is a vertical side view of the wooden tape 14 concerning this invention. (A) is a perspective view before connection of the ultrathin protrusion 1, (b) is a plan view before connection of the ultrathin protrusion 1 subjected to finger joint processing, ) Is a side view of the continuous protruding plate 3 formed by connecting the ultrathin protruding plate 1. It is the schematic which shows the formation process of the coating layer 15, and the joining process of the peeling sheet 16. FIG. It is a partially expanded side view of the joining process in FIG. It is the schematic which shows the removal process of the peeling sheet.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Very thin veneer 1a, 1b Serrated joint edge 2 Joining tape 3 Continuous veneer 14 Wood tape 15 Coating layer 16 Release sheet 22 Roll press

Claims (2)

  A plurality of ultra-thin veneers are abutted via the serrated joint edges of the finger joints formed at the ends in the longitudinal direction of the veneer, and the back surface of the continuous veneer is made of urethane-reactive hot melt resin. A woody tape, characterized in that a coating layer is formed, and the butted portion of the serrated joint edge is joined by the coating layer. A plurality of ultrathin protruding plates are abutted through the serrated joint edges of the finger joints formed at their longitudinal ends, and a bonding tape is attached to the upper surface of the abutting portion to temporarily fix them in a row. Connecting to form a continuous veneer,
The continuous veneer is made to run in a tensile state, and a urethane-based reactive hot-melt resin is continuously applied to the back surface of the continuous veneer to which the bonding tape is not attached to form a coating layer. Supplying a release sheet to the surface and clamping with a roll press;
A method of manufacturing a wood tape, comprising: a step of grinding a surface of a continuous protruding plate, removing a joining tape, and adjusting to a predetermined thickness.

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