JP2024012025A - Plywood for wooden mold - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a plywood for a wooden mold which can restrict decrease of the density of a portion thereof including a notch provided to prevent warpage, warp, or the like, thereby suppressing burning in thermal cutting processing by a laser beam.

SOLUTION: A plywood 3 for a wooden mold used as a base material of the wooden mold in which a processing blade is implanted, includes a plywood body 21 having a notch 30 separating woody fibers, a cover plate 23 adhered to the plywood body 21 so as to cover the notch 30, and a coating layer 25 formed so as to cover the cover plate 23.

SELECTED DRAWING: Figure 3

COPYRIGHT: (C)2024,JPO&INPIT

Description

TECHNICAL FIELD The present invention relates to plywood for wooden molds used as a base material for wooden molds having processing blades implanted therein, and a method for manufacturing the plywood for wooden molds.

BACKGROUND OF THE INVENTION Sheet-like blanks, which are developed into paper containers and the like, are generally manufactured using wooden molds. Plywood for wooden molds is widely used as a base material for wooden molds. The wooden mold is constructed by planting cutting blades such as punching blades and creasing blades on wooden plywood. When inserting the processing blade into the plywood for the wooden pattern, a laser beam is irradiated onto the plywood for the wooden pattern in a manner that corresponds to the blank shape and the folds of the blank. A penetrating insertion groove is formed in the plywood for the wooden pattern. Then, by inserting the processing blade into the formed insertion groove and planting it on the plywood for the wooden pattern, a wooden pattern such as a Thomson cutting die is assembled.

In order to ensure high processing accuracy in the wooden molds mentioned above, it is of course necessary to form the insertion grooves formed in the wooden mold plywood to an appropriate groove width, and also to prevent the warping of the wooden mold plywood itself. It is necessary to prevent the occurrence of twisting, twisting, etc. One way to prevent the occurrence of warping or twisting of the plywood itself is to make cuts in the plywood body that makes up the core of the plywood for the wooden mold so as to separate the wood fibers (for example, (See Patent Document 1).

Japanese Patent Application Publication No. 2014-218034

In Patent Document 1, when attempting to manufacture plywood for a wooden pattern with high precision by preventing warping, twisting, etc., the cut provided in the plywood body is, for example, about 60 to 70% of the thickness of the plywood body. It is said that it is sufficient to cut the plywood body to a depth of 100 mm, and it is formed by cutting from one side plate surface of the plywood body toward the other side plate surface using a special cutter.

The abdomen of a knife is thickest, and the thickness decreases toward the cutting edge. When a cut is made in the plywood body using such a knife, the gap between the cuts is the largest in the part where the depth is small (shallow part), and as the depth increases, the gap between the cuts becomes smaller until the depth is the largest. Although the wood fibers are separated at some points, the plywood body parts on both sides of the cut remain in contact due to the elasticity of the wood fibers. In this way, in the part including the cut, the density is relatively reduced compared to the part not including the cut due to the gap that is inevitably created by the cut with the knife. For this reason, in the plywood for wooden molds, there will be variations in density between the part including the cut and the part not including the cut.

By the way, when forming the insertion groove for inserting the processing blade, the laser beam irradiated on the plywood for the wooden pattern will not form the insertion groove even if it is applied to a relatively high-density area that does not include the cut. The output is set to be able to be formed by thermal cutting. When using a laser beam set to such an output to form insertion grooves in relatively high-density areas of plywood for wooden molds that do not include cuts, thermal cutting will be performed without any problems and the insertion grooves will be formed without any problems. can be formed to have an appropriate groove width. However, even if the output of the laser beam is the same, when forming insertion grooves in relatively low-density parts of plywood for wooden molds, including cuts, excessive thermal cutting may occur, resulting in burnout and improper groove formation. The groove width may be larger than the width. If a machining blade is inserted and planted into an insertion groove with a groove width larger than the appropriate groove width, the implantation state of the machining blade will become loose and the machining accuracy of the blank will deteriorate.

The present invention has been made in view of the above-mentioned problems, and it is possible to suppress the decrease in density of the part including the notches provided to prevent warpage, twisting, etc. The purpose of the present invention is to provide plywood for wooden molds that can suppress burnout over time, and a method for manufacturing plywood for wooden molds.

The characteristic structure of the plywood for wooden molds according to the present invention to solve the above problems is as follows:
Plywood for wooden molds used as a base material for wooden molds on which processing blades are planted,
A plywood body having cuts that divide the wood fibers;
a covering plate adhered to the plywood body so as to cover the cut;
a coating layer formed to cover the covering plate;
The goal is to prepare for

According to the plywood for a wooden pattern of this configuration, since the coating layer is formed to cover the covering board, moisture evaporation from the board surface on the side covered by the coating layer (coated side board surface) in the covering board is This means that moisture evaporation is suppressed more than from the side of the board that is bonded to the plywood body (the non-coated side board surface). Therefore, in the coated plate, evaporation of moisture progresses relatively more on the non-coated side plate surface than on the coated side plate surface, and the shrinkage action progresses more on the non-coated side plate surface than on the coated side plate surface. As a result, tensile stress remains inside the plywood body in the thickness direction due to the force that causes the coating plate to warp in a convex shape toward the coated side plate surface. Compressive stress remains in the direction. The portion of the plywood body that includes the cut is where the cross-sectional shape changes suddenly. In other words, the gap between the cuts is relatively large in the part where the depth of cut is small, and as the depth of cut increases, the gap between the cuts becomes smaller. Although the cut is separated, the plywood body parts on both sides of the cut remain in contact due to the elasticity of the wood fibers. Among the tensile stress and compressive stress that remain inside the plywood body, the compressive stress does not act on the small depth of cut where the gap is relatively large and the vicinity thereof, and the plywood on both sides of the cut is affected accordingly. Stress is concentrated at and near the deepest part of the cut where the main body parts are in contact (so-called stress concentration). For this reason, the plywood main body parts on both sides of the notch at the deepest part of the cut and in the vicinity thereof are brought into close contact, and the density of this closely joined part increases relative to the density of the surrounding area. . In the part of plywood for wooden molds that includes cuts, the density decreases due to the gaps that inevitably occur due to the creation of the cuts, but the density increases at the part where the cuts are the deepest and in the vicinity, resulting in a large increase in density. Become. As a result, it is possible to suppress a decrease in density in the entire depth direction of the portion of the plywood for the wooden pattern that includes the cuts. In this way, it is possible to suppress the decrease in density of the part including the notch provided to prevent warping, twisting, etc., thereby suppressing burnout during thermal cutting by the laser beam when the part is irradiated with the laser beam. Can be done.

In the plywood for wooden molds according to the present invention,
It is preferable that the plywood main body portions on both sides of the notch in the deepest part of the notch and in the vicinity thereof are in close contact with each other.

According to the plywood for wooden molds with this configuration, the plywood body parts on both sides of the notch at the deepest part of the cut and the vicinity thereof are brought into close contact with each other, so that the density of the part that is brought into close contact with the part is the density of the surrounding area. This increases the relative density to Burnout during cutting can be suppressed.

In the plywood for wooden molds according to the present invention,
It is preferable that the cut is formed diagonally with respect to the thickness direction of the plywood main body.

For example, when installing a processing blade in plywood for a wooden pattern, an insertion groove for inserting the processing blade formed in the thickness direction of the plywood body and a notch formed in the thickness direction of the plywood body are Depending on the size of the cut gap, most of the plywood body around the area where the insertion groove will be provided will hold the processing blade. It may not function and the holding power of the processing blade may decrease significantly. According to the plywood for wooden molds of this configuration, the notches are formed diagonally with respect to the thickness direction of the plywood body, so the plywood for wooden molds is formed in areas other than the areas where the notches intersect with the insertion grooves. Since the plywood main body functions to hold the processing blade, it is possible to suppress a decrease in the holding power of the processing blade.

In the plywood for wooden molds according to the present invention,
It is preferable that the cut is formed in an oblique direction with respect to at least one side of the plywood body.

When installing a processing blade in plywood for wooden molds, the insertion groove for inserting the processing blade formed in the thickness direction of the plywood body is often formed so as to be parallel to at least one side of the plywood body. . If the notch is formed parallel to at least one side of the plywood body, and the relative positions of the insertion groove and the notch are the same or close, depending on the size of the gap between the notches, the insertion groove may be Most of the plywood main body portion around the area where is provided does not function to hold the processing blade, and there is a possibility that the holding force of the processing blade may be significantly reduced. According to the wooden pattern plywood of this configuration, the cut is formed diagonally with respect to at least one side of the plywood body, so that the insertion groove and the cut intersect with each other. Therefore, in the plywood for the wooden mold, the main body portion of the plywood other than the location where the cut and the insertion groove intersect function to hold the processing blade, so that a decrease in the holding force of the processing blade can be suppressed.

In the plywood for wooden molds according to the present invention,
It is preferable that the plywood main body is constructed by laminating a plurality of veneers in which the cuts are formed.

According to the plywood for wooden molds with this configuration, warping and twisting of each veneer is prevented by the notches formed in each veneer, so warping and twisting of the plywood body made of multiple veneers are prevented. Twisting and the like can be more effectively prevented. In each veneer, the gap between the cuts is relatively large in areas where the depth of cut is small, and as the depth of cut increases, the gap between the cuts becomes smaller, and the gap between the cuts is relatively large in the areas where the depth of cut is small, and as the depth of cut increases, the gap between the cuts becomes smaller. Although the wood fibers are separated in the vicinity, the veneer parts on both sides of the cut remain in contact due to the elasticity of the wood fibers. Of the tensile stress and compressive stress that remain inside the plywood body (veneer), the compressive stress does not act on areas where the gap is relatively large and the depth of cut is small, and the vicinity thereof, and the depth of cut is reduced accordingly. The depth of the cut is concentrated at and near the deepest part of the cut where the veneer parts on both sides are in contact with each other. For this reason, the parts of the veneer on both sides of the notch at the deepest part of the cut and in the vicinity thereof are brought into close contact, and the density of this part that is brought into close contact increases relative to the density of the surrounding area. . In the part of each veneer that includes a cut, the density decreases due to the gaps that inevitably occur due to the creation of the cut, but the density increases at the part where the cut is the deepest and in its vicinity. . As a result, it is possible to suppress a decrease in the overall density in the depth direction of the portion including the cuts in the plywood for a wooden mold having a plywood body formed by laminating a plurality of veneers in which cuts have been formed. In this way, it is possible to suppress the decrease in density of the part including the notch provided to prevent warping, twisting, etc., thereby suppressing burnout during thermal cutting by the laser beam when the part is irradiated with the laser beam. Can be done.

In the plywood for wooden molds according to the present invention,
It is preferable that the covering plate is adhered to the plywood body so as to eliminate warping caused in the covering plate by forming the coating layer.

According to the plywood for wooden molds with this configuration, the force applied to the covering board to eliminate the warping caused on the covering board by forming the coating layer is applied to the plywood body by adhering the covering board to the plywood body. Compressive stress is generated in the form that remains inside. This compressive stress is caused by the force applied to the cover plate in order to eliminate the warpage that has occurred in the cover plate, so it is a relatively large stress, and it is a relatively large stress that affects the depth of the cut at the deepest part of the cut and its vicinity. The plywood body parts on both sides of the plywood can be firmly attached. As a result, it is possible to more effectively suppress a decrease in the density of the portion of the plywood for the wooden pattern that includes the cuts, and it is possible to reliably suppress burnout during thermal cutting using a laser beam.

In the plywood for wooden molds according to the present invention,
Preferably, the coating layer has at least one of an antiviral effect, an antibacterial effect, an insect repellent effect, and an antifungal effect.

According to the plywood for wooden molds with this structure, viruses, bacteria, pests, and molds are prevented from forming on wooden molds by the coating layer having at least one of antiviral, antibacterial, insect repellent, and antifungal effects. This can be prevented from occurring on the plywood itself. As a result, it is possible to keep the sanitary environment of not only production sites such as punching processing but also the produced blanks (products) such as paper containers in a clean state.

Next, the characteristic configuration of the method for manufacturing plywood for wooden molds according to the present invention to solve the above problems is as follows:
A method for producing plywood for a wooden mold used as a base material for a wooden mold on which a processing blade is planted,
A covering board bonding step of bonding a covering board to a plywood body having cuts that divide the wood fibers so as to cover the cuts;
a coating layer forming step of forming a coating layer to cover the covering plate;
The goal is to include the following.

According to the method for manufacturing plywood for a wooden pattern of the present configuration, a coating layer forming step is performed in which a coating layer is formed so as to cover the covering board bonded to the plywood body by performing the covering board bonding step. As a result, a coating layer is formed to cover the covering board, so that moisture evaporation from the side of the covering board that is covered by the coating layer (coated side board surface) is limited to the side that is bonded to the plywood body. This means that moisture evaporation from the board surface (non-coated side board surface) is suppressed. Therefore, in the coated plate, evaporation of moisture progresses relatively more on the non-coated side plate surface than on the coated side plate surface, and the shrinkage action progresses more on the non-coated side plate surface than on the coated side plate surface. As a result, the covering board tends to warp in a convex manner on the side of the coated side board, but since the covering board is glued to the plywood body, it cannot warp, and the warping occurs. Compressive stress caused by the applied force remains inside the plywood body. The parts of the plywood body on both sides of the notch at the deepest part of the cut and in the vicinity thereof are brought into close contact by the action of the compressive stress remaining inside the plywood body, and the density of this closely joined part is equal to the density of the surrounding area. It increases and becomes larger relatively to that of the target. As a result, it is possible to suppress a decrease in density in the entire depth direction of the portion of the plywood for the wooden pattern that includes the cuts. In this way, it is possible to suppress the decrease in density of the part including the notch provided to prevent warping, twisting, etc., thereby suppressing burnout during thermal cutting by the laser beam when the part is irradiated with the laser beam. Can be done.

Further, the characteristic structure of the method for manufacturing plywood for wooden molds according to the present invention to solve the above problems is as follows:
A method for manufacturing plywood for a wooden mold used as a base material for a wooden mold on which a processing blade is planted,
a coating layer forming step of forming a coating layer to cover the covering plate;
A covering board bonding step of bonding the covering board which has warped by forming the coating layer on a plywood body having cuts that divide wood fibers so as to cover the cuts and eliminate the warping. ,
The goal is to include the following.

According to the method for manufacturing plywood for a wooden pattern of this configuration, when the coating layer is formed to cover the covering board by implementing the coating layer forming step, the coating layer starts from the board surface on the side covered by the coating layer (coated side board surface). This means that the evaporation of moisture from the plywood body is suppressed more than the evaporation of moisture from the side of the board that is bonded to the plywood body (the non-coated side board surface). Therefore, in the coated plate, evaporation of moisture progresses relatively more on the non-coated side plate surface than on the coated side plate surface, and the shrinkage action progresses more on the non-coated side plate surface than on the coated side plate surface. As a result, the coating plate is warped in a convex manner on the coating side plate surface side. In the covering board adhesion process, the covering board, which is warped by forming a coating layer on the plywood body that has cuts that separate the wood fibers, covers the cuts in the plywood main body and is bonded to eliminate warping. be done. For this reason, the force applied to the covering board to eliminate the warpage caused by forming the coating layer is compressed in the form of remaining inside the plywood body as the covering board is adhered to the plywood body. Stress occurs. This compressive stress is caused by the force applied to the cover plate in order to eliminate the warpage that has occurred in the cover plate, so it is a relatively large stress, and it is a relatively large stress that affects the depth of the cut at the deepest part of the cut and its vicinity. The plywood body parts on both sides of the plywood can be firmly attached. As a result, it is possible to more effectively suppress a decrease in the density of the portion of the plywood for the wooden pattern that includes the cuts, and it is possible to reliably suppress burnout during thermal cutting using a laser beam.

FIG. 1 is an overall perspective view of a wooden mold using plywood for wooden molds as a base material according to an embodiment of the present invention. FIG. 2 is a cross-sectional view of the main part of the wooden mold in which the processing blade is implanted. FIG. 3 is a cross-sectional view of the plywood for a wooden mold according to an embodiment of the present invention before the insertion groove is formed. FIG. 4 is an enlarged cross-sectional view of the main part of the plywood for the wooden pattern, including the notches. FIG. 5 is an explanatory diagram of the first method of manufacturing plywood for wooden molds. FIG. 6 is an explanatory diagram of a second method of manufacturing plywood for wooden molds. FIG. 7 is a cross-sectional view of the wooden pattern plywood according to another embodiment 1 before the insertion groove is formed. FIG. 8 is a plan view of a plywood body constituting a plywood for a wooden mold according to another embodiment 2. FIG. FIG. 9 is a perspective view illustrating the structure of a plywood body constituting a plywood for a wooden pattern according to another embodiment 3.

The present invention will be described below with reference to the drawings. In the following embodiments, a wooden mold (Thomson cutting die) for manufacturing a sheet-like blank, which is an expanded form of a paper carton, by punching, will be described as an example. However, the present invention is not intended to be limited to the embodiments described below or the configurations described in the drawings. In each figure, it is shown that the plywood for wooden molds of the present invention is composed of a plurality of layers, but the thickness relationship of each layer is appropriately exaggerated or simplified for ease of explanation. It does not strictly reflect the size relationship (scale) of the thickness of each layer in plywood for wooden molds.

<Structure of the wooden mold>
FIG. 1 is an overall perspective view of a wooden mold 1 using a wooden mold plywood 3 as a base material according to an embodiment of the present invention. The wooden mold 1 shown in FIG. 1 includes a wooden mold plywood 3 that is rectangular in plan view and a processing blade 5 that is implanted in the wooden mold plywood 3. The processing blade 5 includes a punching blade 7 and a line pressing blade 9. The punching blade 7 is arranged so as to match the outer shape of the blank to be manufactured. Furthermore, the creasing blade 9 is arranged so as to correspond to the folds of the blank to be manufactured.

FIG. 2 is a cross-sectional view of a main part of the wooden mold 1 where the processing blade 5 is implanted. As shown in FIG. 2, the wooden mold 1 is planted by inserting the punching blade 7 and the creasing blade 9 into a narrow insertion groove 15 provided in the plywood 3 for the wooden pattern and penetrating through the thickness direction. It is made up of. The insertion groove 15 is formed by irradiating the wooden pattern plywood 3 with a laser beam output from a laser processing machine so as to correspond to the shape and folds of the blank.

<Plywood for wooden patterns>
FIG. 3 is a cross-sectional view of the plywood 3 for a wooden mold according to an embodiment of the present invention before the insertion groove is formed. The plywood 3 for the wooden pattern includes a plywood main body 21 having a board surface on one side (upper side) and the other side (lower side), a covering plate 23 disposed so as to cover each board surface of the plywood main body 21, and each A coating layer 25 is provided to cover the surface of the covering plate 23.

<Plywood body>
The plywood main body 21 is, for example, a laminated structure board made by laminating and gluing a plurality of veneers cut out from logs using a rotary lace or the like so that the wood grains are alternately orthogonal to each other. It is also possible to use medium density fiberboard (MDF), which is made from wood fiber obtained from planted trees that can be produced in a planned manner, added with a synthetic resin as an adhesive, and then hot-pressed into a plate shape. .

<Cut>
The plywood body 21 has required cuts 30 for dividing the wood fibers. The cut 30 is provided to a depth of about 60 to 70% of the thickness of the plywood body 21 in order to prevent warping, twisting, etc. and to manufacture a high-precision plywood 3 for a wooden pattern. The cuts 30 are formed by cutting the plywood body 21 from the upper plate surface to the lower plate surface of the plywood body 21 using a special cutter using a panel processing apparatus described in, for example, Japanese Patent Application Publication No. 2014-218034 (Patent Document 1). It is formed by cutting diagonally to the thickness direction. In this way, the cut 30 is formed diagonally at a predetermined angle with respect to the thickness direction of the plywood main body 21.

FIG. 4 is an enlarged cross-sectional view of the main part of the wooden pattern plywood 3 including the notch 30. As shown in FIG. 4(a), in the part of the plywood body 21 that includes the cut 30, the gap between the cuts 30 is relatively large in the part where the depth of the cut 30 is small (shallow part 30a), and the gap between the cuts 30 is relatively large. As the depth increases, the gap between the notches 30 becomes smaller, and although the wood fibers are separated at the deepest part of the notch 30 (the deep part 30b) and its vicinity, the elasticity of the wood fibers causes the gaps between the notches 30 to become smaller. The parts of the plywood body 21 are in contact.

<Covering board>
The covering board 23 is a laminated structure board with a relatively small thickness, which is made by overlapping and bonding at least two veneers with fiber orientation so that their fiber directions are orthogonal to each other. Can be used. The cover plate 23 is bonded to each plate surface of the plywood body 21 using an adhesive.

<Coating layer>
The coating layer 25 is formed by applying a paint containing at least one of a known antiviral agent, an antibacterial agent, an insect repellent, and a fungicide to the surface of each coating plate 23. It has at least one of the following: action, antibacterial action, insect repellent action, and antifungal action. Note that the coating layer 25 is not particularly limited as long as it can cover the covering plate 23 so as to suppress evaporation of moisture from the covering plate 23. For example, in addition to forming the coating layer 25 by applying a paint to the surface of the covering plate 23, the coating layer 25 may be formed by applying a polyester resin or the like to the surface of the covering plate 23, or by applying water-repellent paper, resin-impregnated paper, etc. It may be formed by attaching a resin film or other film capable of suppressing water evaporation to the surface of the covering plate 23.

In the wooden pattern plywood 3 having the above structure, a coating layer 25 is formed to cover the covering plate 23, as shown in FIG. 4(a). Therefore, in the covering plate 23, evaporation of moisture from the plate surface on the side covered by the coating layer 25 (coated side plate surface 23a) is considerably suppressed. On the other hand, in the covering board 23, the board surface on the side to be adhered to the plywood main body 21 (non-coated side board surface 23b) has an adhesive layer (not shown) formed by applying an adhesive between it and the plywood main body 21; It is not completely coated with the adhesive layer. Furthermore, the plywood main body 21 has a larger thickness than the cover plate 23, and has a larger outer circumferential surface area that comes into contact with the outside air. For these reasons, evaporation of moisture from the non-coated side plate surface 23b of the covering plate 23 cannot be suppressed very much. Therefore, in the covering plate 23, moisture evaporation progresses relatively more on the non-coated side plate surface 23b than on the coated side plate surface 23a, and the shrinkage action progresses more on the non-coated side plate surface 23b than on the coated side plate surface 23a. become. As a result, tensile stress remains inside the plywood body 21 in the thickness direction due to the force that causes the coating plate 23 to warp in a convex shape toward the coating side plate surface 23a. Compressive stress remains in the direction along the surface. The section of the plywood body 21 that includes the notch 30 is where the cross-sectional shape changes suddenly, and the gap between the notches 30 is relatively large at the shallow part 30a of the notch 30, and as the depth of the notch 30 increases, the Although the gap 30 becomes smaller and the wood fibers are separated at the deep part 30b of the cut 30 and its vicinity, the parts of the plywood body 21 on both sides of the cut 30 are in contact due to the elasticity of the wood fibers. Of the tensile stress and compressive stress remaining inside the plywood body 21, the compressive stress does not act on the shallow part 30a of the notch 30 and its vicinity, where the gap is relatively large. The parts of the plywood body 21 are concentrated at and near the deep part 30b of the notch 30 in contact with each other (indicated by the arrow with the symbol "σ" in FIG. 4(a)). Therefore, the parts of the plywood body 21 on both sides of the notch 30 in the deep part 30b of the notch 30 and in the vicinity thereof are brought into close contact with each other, and the density of this part that is brought into close contact increases relative to the density of the surrounding area. Become. In the part of plywood 3 for the wooden pattern that includes the notch 30, the density decreases due to the gap that inevitably occurs due to the provision of the notch 30, but the density in the deep part 30b of the notch 30 and its vicinity increases. growing. As a result, it is possible to suppress a decrease in density in the entire depth direction of the portion of the plywood 3 for the wooden mold including the notch 30. In this way, it is possible to suppress a decrease in the density of the area including the notch 30 provided to prevent warping and twisting, thereby suppressing burnout during thermal cutting by the laser beam when the area is irradiated with a laser beam. be able to.

In the plywood for a wooden pattern 3, the notch 30 is formed diagonally with respect to the thickness direction of the plywood body 21, so the position where the notch 30 and the insertion groove 15 intersect in the plywood for a wooden pattern 3 It becomes a relationship. Therefore, as shown in FIG. 4(b), the portion of the plywood body 21 around the area corresponding to the gap between the notches 30 (the portion indicated by the arrow with the symbol "A" in FIG. 4(b)) is Although it does not function to hold the processing blade 5, the parts of the plywood body 21 other than the area where the cut 30 and the insertion groove 15 intersect function to hold the processing blade 5. Decrease in holding power can be suppressed.

In the plywood for wooden molds 3, viruses, bacteria, pests, and molds are prevented from being absorbed by the plywood for wooden molds due to at least one of the antiviral, antibacterial, insect repellent, and antifungal effects of the coating layer 25. This can be prevented from occurring. As a result, it is possible to keep the sanitary environment of not only production sites such as punching processing but also the produced blanks (products) such as paper containers in a clean state.

<First manufacturing method of plywood for wooden molds>
FIG. 5 is an explanatory diagram of the first manufacturing method of the plywood 3 for wooden molds. The wooden pattern plywood 3 can be manufactured by performing the following covering plate adhesion process and coating layer forming process.

<Cover board adhesion process>
As shown in FIGS. 5(a) and 5(b), in the covering plate bonding step, the covering plate 23 is bonded to each plate surface of the plywood body 21 using an adhesive. Since the coating layer 25 is not formed on any surface of the covering plate 23 to be bonded at this time, the evaporation of moisture proceeds to the same degree on each plate surface of the covering plate 23, and the coating layer 25 is not formed on any plate surface of the covering plate 23. The covering plate 23 in a flat state is bonded to each plate surface of the plywood body 21 without causing any warpage such that the plate 23 becomes convex on either side of the plate surface. In this way, each board surface including the notch 30 of the plywood body 21 is covered with the covering board 23.

<Coating layer formation process>
As shown in FIGS. 5(b) to 5(c), in the coating layer forming step, coating plates 23 are A coating layer 25 is formed to cover the plate surface.

In the covering board 23 of the wooden pattern plywood 3 manufactured by the first manufacturing method, the board surface on the side covered by the coating layer 25 (coated side board surface 23a) is prevented from contacting with the outside air by the coating layer 25. Therefore, evaporation of moisture from the coated side plate surface 23a is considerably suppressed. On the other hand, in the covering board 23, an adhesive layer (not shown) formed by applying an adhesive is interposed between the plate surface of the covering board 23 and the plywood main body 21 (non-coated side board surface 23b) to be adhered to the plywood main body 21. However, it is not completely coated with the adhesive layer. Furthermore, the plywood main body 21 has a larger thickness than the cover plate 23, and has a larger outer circumferential surface area that comes into contact with the outside air. The non-coated side plate surface 23b of the covering board 23 communicates with the outside through the plywood body 21 and an adhesive layer (not shown) interposed between it and the plywood body 21, so moisture from the non-coated side plate surface 23b is prevented. It is not possible to suppress transpiration very much. Therefore, in the covering plate 23, moisture evaporation progresses relatively more on the non-coated side plate surface 23b than on the coated side plate surface 23a, and the shrinkage action progresses more on the non-coated side plate surface 23b than on the coated side plate surface 23a. become. As a result, the covering board 23 tends to warp in a convex manner toward the coating side plate surface 23a, but since the covering board 23 is bonded to the plywood body 21, it cannot warp. , compressive stress caused by the force that tried to cause warping remains inside the plywood body 21. The parts of the plywood body 21 on both sides of the notch 30 at the deep part 30b of the notch 30 are brought into close contact with each other by the action of the compressive stress remaining inside the plywood body 21, and the density of this closely joined part is different from the density of the surrounding area. relatively increases and becomes larger. As a result, it is possible to suppress a decrease in density in the entire depth direction of the portion of the plywood 3 for the wooden mold including the notch 30. In this way, it is possible to suppress a decrease in the density of the area including the notch 30 provided to prevent warping and twisting, thereby suppressing burnout during thermal cutting by the laser beam when the area is irradiated with a laser beam. be able to.

<Second manufacturing method of plywood for wooden molds>
FIG. 6 is an explanatory diagram of the second manufacturing method of the wooden mold plywood 3. The wooden pattern plywood 3 can be manufactured by performing the following coating layer forming process and covering board bonding process.

<Coating layer formation process>
As shown in FIG. 6(a), in the coating layer forming step, a paint containing an antiviral agent or the like is applied only to one surface of the covering plate 23. Thereby, the coating layer 25 is formed so as to cover only one side of the plate surface of the covering plate 23.

When the coating layer 25 is formed so as to cover only one side of the plate surface of the covering plate 23, evaporation of moisture from the plate surface on the side covered by the coating layer 25 (coated side plate surface 23a) is prevented by the coating layer 25 being exposed to the outside air. This can be significantly suppressed to prevent contact with On the other hand, since the board surface on the side to be adhered to the plywood body 21 (non-coated side board surface 23b) comes into contact with the outside air, evaporation of moisture from the non-coated side board surface 23b cannot be suppressed. Therefore, in the covering plate 23, the evaporation of moisture progresses relatively more on the non-coated side plate surface 23b than on the coated side plate surface 23a, and the shrinkage action progresses more on the non-coated side plate surface 23b than on the coated side plate surface 23a. It turns out. As a result, the coating plate 23 is warped in a convex shape (an upward convex shape and a downward convex shape are shown in FIG. 6A) on the side of the coating side plate surface 23a.

<Cover board adhesion process>
As shown in FIGS. 6(b) to 6(c), in the covering board adhesion process, the non-coated side plate surface 23b of each covering board 23, which has been warped by forming the coating layer 25, is attached to each of the plywood main bodies 21. With the plywood body 21 and each cover plate 23 facing each other, and with an adhesive (not shown) interposed between the plywood body 21 and each cover plate 23, an adhesive press is used to press the plywood body 21 and each cover plate 23 to integrate them. In this way, each board surface including the cut 30 of the plywood body 21 is covered by the covering plate 23, and each covering plate 23 is adhered to the plywood body 21 so as to eliminate warping caused by forming the coating layer 25. .

In the second manufacturing method described above, the force applied to the covering plate 23 so as to eliminate the warpage caused in the covering plate 23 by forming the coating layer 25 causes the covering plate 23 to be adhered to the plywood body 21. This causes compressive stress to remain inside the plywood body 21. In this way, the compressive stress generated in the second manufacturing method is due to the force applied to the covering plate 23 in order to eliminate the warpage that occurs in the covering plate 23. On the other hand, the compressive stress generated in the first manufacturing direction described above becomes convex toward the coating side plate surface 23a by forming the coating layer 25 on the covering plate 23 after being bonded to the plywood main body 21. Such a warp would have occurred, but since the cover plate 23 is bonded to the plywood body 21, the warp cannot occur, and this is due to the force that tried to cause the warp. Therefore, the compressive stress generated in the second manufacturing method is larger than the compressive stress generated in the first manufacturing method. Therefore, the parts of the plywood body 21 on both sides of the notch 30 in the deep part 30b of the notch 30 and in the vicinity thereof can be brought into closer contact with each other. As a result, it is possible to more effectively suppress a decrease in the density of the portion of the plywood 3 for the wooden pattern that includes the cuts 30, and it is possible to reliably suppress burnout during thermal cutting using a laser beam.

As above, the plywood for wooden molds and the method for manufacturing the plywood for wooden molds of the present invention have been explained based on one embodiment, but the present invention is not limited to the configuration described in the above embodiment, and the gist thereof The configuration can be changed as appropriate without departing from the above.

(Alternative Embodiment 1)
FIG. 7 is a cross-sectional view of the wooden pattern plywood 3 according to another embodiment 1 before the insertion groove is formed. FIG. 7(a) shows an example in which diagonal cuts 30 are provided on both sides of the plywood body 21, and FIG. FIG. 7(c) is an example of a mode in which straight cuts 30' are provided on both plate surfaces of the plywood body 21.

In the above embodiment, the cut 30 is formed by cutting diagonally from the upper plate surface of the plywood main body 21 toward the lower plate surface using a special knife, but the cut 30 is not limited to this. do not have. As shown in FIG. 7(a), diagonal cuts are made on both sides of the plywood body 21 at a predetermined angle with respect to the thickness direction of the plywood body 21 by diagonally cutting the upper and lower surfaces of the plywood body 21 alternately at appropriate intervals. A notch 30 may be provided. Furthermore, instead of the diagonal cut 30, a cut 30' extending straight in the thickness direction of the plywood body 21 may be provided on one side of the board (see FIG. 7(b)), or on both boards. It may be provided on the surface (see FIG. 7(c)).

(Alternative Embodiment 2)
FIG. 8 is a plan view of a plywood main body 21 constituting a plywood for a wooden pattern 3 according to another embodiment 2. FIG. As shown in FIG. 8, the plywood 3 for a wooden pattern is constructed using a plywood body 21 in which cuts 30 (30') are formed diagonally with respect to the long side 21a and the short side 21b of the plywood body 21. Good too. According to the plywood 3 for a wooden pattern in another embodiment 2, the cuts 30 (30') are formed diagonally with respect to the long side 21a and the short side 21b of the plywood main body 21, so that the long side 21a and the short side The insertion groove 15 (see FIG. 2), which is often formed parallel to the groove 21b, and the notch 30 (30') intersect with each other. Therefore, the part of the plywood body 21 other than the intersection of the cut 30 (30') and the insertion groove 15 in the plywood 3 for the wooden pattern functions to hold the processing blade 5, so that the processing blade 5 Decrease in holding power can be suppressed.

(Alternative Embodiment 3)
FIG. 9 is a perspective view illustrating the structure of a plywood body 21 constituting a plywood 3 for a wooden pattern according to another embodiment 3. FIG. In the above embodiment, the plywood main body 21 in which cuts 30 are formed in a laminated structure board made of a plurality of veneers having fiber orientation and bonded to each other so that their fiber directions are perpendicular to each other is used to create a wooden pattern. Although an example of a mode of configuring the plywood 3 has been shown, the present invention is not limited to this. As shown in FIG. 9, a plywood body 21 is used, in which veneers 40 having a large number of perforation-like cuts 35 that divide wood fibers are overlapped and bonded so that the fiber directions are orthogonal to each other. There is also an example of a mode in which the wooden pattern plywood 3 is constructed. According to the wooden plywood 3 of the third embodiment, since warpage, twisting, etc. of each veneer 40 are prevented by the notches 35 formed in each veneer 40, a plurality of veneers 40 are laminated. It is possible to more effectively prevent warping, twisting, etc. of the plywood main body 21 caused by the bending. Further, similarly to the above embodiment, it is possible to suppress a decrease in density in the entire depth direction of the portion of the plywood 3 for the wooden mold including the notch 35. Therefore, the same effects as those of the above embodiment can be obtained.

The plywood for wooden molds and the method for manufacturing plywood for wooden molds of the present invention can be used as a base material for wooden molds used in the process of manufacturing blanks such as paper containers, and can also be used, for example, as a synthetic resin sheet It can be used as a wooden base material for punching various sheet materials such as cloth and leather into desired shapes.

1 Wood pattern 3 Plywood for wood pattern 5 Processing blade 21 Plywood body 23 Covering board 25 Coating layer 30 Cut 35 Cut 40 Veneer

Claims (6)

Plywood for wooden molds used as a base material for wooden molds on which processing blades are planted,
A plywood body having cuts that divide the wood fibers;
a covering plate adhered to the plywood body so as to cover the cut;
a coating layer formed to cover the covering plate;
Equipped with
Due to the force that suppresses the evaporation of moisture from the coated side plate surface of the coated plate on the side covered by the coating layer and causes the coated plate to warp in a convex shape toward the coated side plate surface. . A plywood for wooden molds, in which compressive stress remains inside the plywood body in a direction along the surface of the plywood body. The plywood for a wooden mold according to claim 1, wherein the plywood main body portions on both sides of the notch in the deepest part of the notch and the vicinity thereof are in close contact with each other. The plywood for a wooden mold according to claim 1 or 2, wherein the cut is formed diagonally with respect to the thickness direction of the plywood main body. The plywood for a wooden mold according to claim 1 or 2, wherein the cut is formed in a diagonal direction with respect to at least one side of the plywood main body. The plywood for a wooden pattern according to claim 1 or 2, wherein the plywood main body is constructed by laminating a plurality of veneers in which the cuts are formed. The plywood for wooden shapes according to claim 1 or 2, wherein the coating layer has at least one of an antiviral effect, an antibacterial effect, an insect repellent effect, and an antifungal effect.

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