JP4224125B1 - Substrate for die cutting and manufacturing method thereof - Google Patents

Abstract

An object of the present invention is to prevent shrinkage / expansion due to the influence of moisture, and to easily form a groove into which a processing blade is implanted with a constant groove width, and to use an inexpensive die-cutting substrate. Providing die cutting.
A die-cutting base material 2 in which a surface layer material 6 is bonded to a plate surface of a medium density fiberboard 5 made of wood fiber, and the fiberboard 5 has a constant density in the thickness direction. Suppose that Moreover, the surface layer material 6 consists of the wood single board 12 which has the fiber orientation of 3 sheets, and these wood single boards 12 shall be distribute | arranged mutually making the fiber direction mutually orthogonal. The Thomson punching die 1 configured by implanting the punching blade 3 and the ruled line pressing blade 4 into the punching base material 2 can be easily manufactured at low cost and has excellent punching accuracy.
[Selection] Figure 1

Description

The present invention relates to a manufacturing method of the cutting dies for substrate States serving as a base portion of the cutting dies used in the process for manufacturing the blank, such as folding cartons punched, for example, paperboard.

  For example, as a die for paper containers, there is one in which a processing blade such as a punching blade or a ruled line pressing blade is implanted in a plate-shaped punching base (see Patent Document 1).

JP 2006-95653 A

  Conventionally, a plywood has been widely used as a constituent material of a base material for die cutting. The plywood is produced by stacking and bonding a plurality of single plates cut out from raw logs using a rotary lace or the like so that the grain is alternately orthogonal. When implanting a processing blade such as a punching blade or a ruled line pressing blade on a plywood die cutting base material, the die base material is irradiated with a laser beam so as to correspond to a desired blank shape or blank crease. A narrow through groove for inserting the machining blade is formed in the die base material. Then, a Thomson die is assembled by implanting a processing blade into a through groove formed by laser processing.

  In this Thomson die-cutting, a punching process is performed on a processed sheet by pressing a processing blade against the processed sheet. Therefore, if the groove width of the through groove into which the machining blade is inserted is not properly formed, the machining blade will be loosened during repeated punching, and the punching accuracy will deteriorate. Will be invited.

  By the way, in recent years, due to the economic development of emerging countries such as China and India, there is a shortage of logs necessary for making plywood. Due to the difficulty of obtaining raw wood, the price of plywood has remained high, and it is difficult to stably obtain good quality plywood.

  Therefore, it is conceivable to employ a cheap and easily available wood board such as a particle board or a fiber board instead of the plywood as a constituent material of the die base material. Here, the particle board is obtained by mixing a wood chip with an adhesive and forming it into a plate shape through a hot-pressure treatment. The fiber board is obtained by mixing digested wood fiber with an adhesive and forming it into a plate shape through a hot-pressure treatment.

However, when the constituent material of the die base material is the above-described wood board, the following problems occur.
(1) Since the above-mentioned wood board is easily contracted and expanded due to the influence of moisture, the mold dimensions are not stable, and the punching accuracy is deteriorated.
(2) In the above-described wood board, since the density in the thickness direction varies, such as the density in the thickness direction is low while the density in the vicinity of the plate surface is high, the laser processing is performed on the wood board. Is applied, the groove width of the groove engraved by the laser beam is narrow near the high-density plate surface and wide at the low-density central portion, and the groove width of the through-groove into which the processing blade is implanted is constant in the thickness direction. Instead, the machining blade is loosely implanted, resulting in poor punching accuracy.

The present invention has been made to solve such problems, and can prevent shrinkage and expansion due to the influence of moisture, and easily form a groove into which a processing blade is implanted with a constant groove width. it is an object of the present invention that that is possible, moreover to provide a method of manufacturing a low cost cutting dies for substrates States.

In order to achieve the above object, the substrate for die cutting according to the present invention comprises:
A base material for die cutting, in which a surface layer material is attached to the surface of a fiberboard made of wood fiber,
The fiberboard has a constant density in the thickness direction by scraping the front and back surface layer portions of the fiberboard before thickness adjustment formed into a plate shape through a hot-pressure treatment to cause a core portion to appear . (First invention).

  In the present invention, the surface layer material is preferably composed of at least two or more wood veneers having fiber orientation, and the wood veneers are arranged with their fiber directions orthogonal to each other (second) invention).

Next, the die cutting according to the third invention is:
A method for producing a base material for die cutting, wherein a surface layer material is attached to the surface of a fiberboard made of wood fiber,
Before the thickness adjustment, the raw wood chip is cut into small pieces, the synthetic resin that becomes the adhesive is added to the cooked and defibrated material, and then molded into a plate shape by hot-pressure treatment to obtain a fiberboard before thickness adjustment. The surface layer part of the fiberboard is scraped off to make the core part appear to obtain a fiberboard with a constant density in the thickness direction, and the surface layer material is pasted on the front and back of the fiberboard. It is characterized by comprising the step of attaching .

  According to the present invention, since the core part of the die-cutting base material is composed of the fiber board made of wood fiber, the die-cutting base material can be provided at low cost. In addition, since the surface of the fiberboard is provided with a surface layer material, it is possible to prevent moisture from entering and exiting the fiberboard with the surface layer material, and to prevent shrinkage and expansion of the substrate for mold removal due to the influence of moisture. Can do. Moreover, since the density in the thickness direction of the fiberboard is constant, the groove into which the processing blade is implanted can be easily formed with a constant groove width by laser processing.

  Here, the surface layer material is made of a wood veneer having at least two or more fiber orientations, and these wood veneers are arranged so that their fiber directions are orthogonal to each other. The flexural rigidity of the substrate can be further increased, and shrinkage / expansion due to a change in moisture content, warpage, and twist can be more effectively suppressed. Therefore, the dimensional stability of the die base material can be further increased, and the punching accuracy can be kept more stably at a high level.

Next, a specific embodiment of the manufacturing method of the cutting dies for the substrate States according to the invention will be described with reference to the drawings. The embodiment described below is an example in which the present invention is applied to a base material for die cutting that is a base portion of a die die used in a process of punching paperboard to manufacture a blank for a packaging container.

FIG. 1 shows an overall perspective view of a Thomson die according to an embodiment of the present invention.
FIG. 2 is an explanatory diagram of the manufacturing process of the fiberboard.
FIG. 3 is an enlarged view of a part A in FIG. 1 and illustrates a structure of the surface layer material.
FIG. 4 is a cross-sectional view of the main part of the die base material, and shows a state diagram (a) before the machining blade is implanted and a state diagram (b) after the machining blade is implanted. .

  A Thomson die 1 shown in FIG. 1 includes a square plate-like die-cutting base 2, and a punching blade 3 and a ruled line pushing blade 4 implanted in the die-cutting base 2. The punching blade 3 is arranged so as to coincide with the outer shape of the blank to be manufactured. Further, the ruled line pressing blade 4 is arranged according to the blank crease to be manufactured.

  The base material 2 for die cutting is a fiber board 5 as a core material constituting the core part, and surface layer materials 6 and 6 which are attached to the front side plate surface and the back side plate surface of the fiber plate 5 using an adhesive. And is configured.

  The fiber board 5 is a molded board having a predetermined thickness dimension d made of wood fiber as a raw material, and the density is constant from the center in the thickness direction to the front and back plate surfaces. The fiberboard 5 is manufactured through the following manufacturing process 1 and manufacturing process 2.

(Manufacturing process 1: see FIG. 2 (a))
A wood chip obtained by crushing a plantation of a tree species that can be quickly and easily regenerated is cut into small pieces, cooked and defibrated, added with a synthetic resin as an adhesive, and molded into a plate shape through a hot-pressure treatment Thus, a fiber board 10 before thickness adjustment having a thickness dimension D as shown in FIG.

The fiber board 10 before thickness adjustment obtained in the manufacturing process 1 has a density of the core portion 10a (thickness dimension: d) of, for example, about 0.5 g / cm ³ , and each surface layer portion 10b (thickness) on the front side and the back side. The density of the dimension (t) is, for example, about 0.7 g / cm ³ , and is a conventionally known so-called medium density fiberboard (density: 0.35 to 0.80 g / cm ³ ).
A conventionally known medium density fiberboard inevitably has a low density at the center in the thickness direction (in this example, about 0.5 g / cm ³ ) due to the manufacturing method of compressing and solidifying the wood fibers, and the vicinity of the plate surface. The density is high (in this example, about 0.7 g / cm ³ ). That is, the fiber board 10 before thickness adjustment has variations in the density in the thickness direction.

(Manufacturing process 2: refer to FIG. 2 (b))
As shown in FIG. 2 (b), the fiber board 10 before thickness adjustment obtained in the manufacturing process 1 is subjected to sanding treatment using the thickness adjusting sander 11, and the front side of the fiber board 10 before thickness adjustment and Each surface layer part 10b on the back side is scraped off.

  In this way, by removing each surface layer portion 10b of the fiber board 10 before thickness adjustment having a variation in density in the thickness direction and causing the core portion 10a to appear as shown in FIG. 2 (c), the density in the thickness direction is constant. A fiberboard 5 can be obtained.

As shown in FIG. 3, the surface layer material 6 is configured by superimposing three wood single plates 12. This surface layer material 6 applies an adhesive to three relatively thin wood veneers 12 obtained from raw wood using a rotary lace or slicer, and the three wood veneers 12 are arranged in the fiber direction. The laminate of the wood veneer 12 is manufactured by alternately stacking, and the adhesive is completely cured by applying heat and pressure to the laminate of the wood veneer 12, and the density is 0.5 g / cm. ^{About three} .

  As shown in FIG. 1, when implanting the punching blade 3 and the ruled line pressing blade 4 into the punching base material 2, a laser beam is applied to the punching base material 2 so as to correspond to a desired blank shape or blank crease. As shown in FIG. 4A, a narrow through groove 13 for inserting the punching blade 3 and the ruled line pressing blade 4 is formed in the die base material 2 as shown in FIG. Then, as shown in FIG. 4B, the Thomson die 1 is assembled by implanting the punching blade 3 and the ruled line pressing blade 4 into the through groove 13.

According to the die-cutting substrate 2 of the present embodiment, the following operational effects can be obtained.
(1) Since the core material of the base material 2 for die cutting is composed of fiberboards 5 made of wood fibers obtained from planted trees that can be planned and produced, the base material 2 for die cutting is provided inexpensively and stably. can do.
(2) Since the surface layer material 6 is attached to the plate surface of the fiberboard 5, the entry and exit of moisture to the fiberboard 5 can be suppressed by the surface layer material 6, and the shrinkage of the substrate 2 for mold release due to the influence of moisture Expansion can be prevented in advance.
(3) Since the density in the thickness direction of the fiber board 5 is constant and the density of the fiber board 5 and the density of the surface layer material 6 are the same, the punching blade 3 and the ruled line pressing blade 4 are inserted. These through grooves 13 can be easily formed with a constant groove width in the thickness direction of the die base material 2 by laser processing.
(4) Since the plywood formed by bonding the three wood veneers 12 so that the fiber directions are orthogonal to each other is used as the surface layer material 6, it is possible to further increase the bending rigidity of the base material 2 for die cutting. In addition, it is possible to more effectively suppress shrinkage / expansion due to a change in moisture content, warpage, twisting, and the like. Therefore, the dimensional stability of the die-cutting base material 2 can be further increased, and the punching accuracy can be kept more stably at a high level.
The Thomson punching die 1 in which processing blades such as the punching blade 3 and the ruled line pressing blade 4 are implanted in the punching base material 2 exhibiting such an effect can be easily manufactured at low cost and has excellent punching accuracy. There is an advantage.

  As mentioned above, although the base material for die-cutting of this invention and die-cutting using the same were demonstrated based on one embodiment, this invention is not limited to the structure described in the said embodiment, and does not deviate from the meaning. The configuration can be changed as appropriate within the range.

For example, in the present embodiment has shown an example in which the cutting die base material 2 adhered with an adhesive to plywood surface layer material 6 on the plate surface of the fiberboard 5, plywood surface layer material 6 Instead of a) a resin film, b) a composite film in which a resin film and paper are combined, c) a resin plate or the like, which is appropriately selected, is attached to the plate surface of the fiberboard 5 using an adhesive. The base material for die cutting may be constituted by.
Moreover, it is not limited to the structure which affixes the surface layer material 6 on the board surface of the fiber board 5, Film formation, such as waterproof coating, a polyester resin process, and a waterproof printing process, is carried out on the board surface of the fiber board 5. By applying the means, a surface layer material may be attached to the plate surface of the fiberboard 5 to constitute a die-cutting base material.

  The die-cutting substrate of the present invention can prevent shrinkage and expansion due to the influence of moisture, can easily form a groove into which a processing blade is implanted with a constant groove width, and is inexpensive. Since it has characteristics, it can be suitably used for the use of the base member of the die used in the process of manufacturing blanks such as paper containers, as well as various sheet materials such as synthetic resin sheets, cloth, leather, etc. It can also be used for the use of a punched base member that punches out a desired shape.

1 is an overall perspective view of a Thomson die according to an embodiment of the present invention. Fiberboard manufacturing process illustration FIG. 1 is an enlarged view of part A in FIG. 1, illustrating the structure of the surface material. FIG. 2 is a cross-sectional view of the main part of the die base material, a state diagram before the machining blade is implanted (a) and a state diagram after the machining blade is implanted (b)

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Thomson die cutting 2 Substrate for die cutting 3 Punching blade 4 Ruled line pressing blade 5 Fiber board 6 Surface material 12 Wood single board

Claims (3)

A base material for die cutting, in which a surface layer material is attached to the surface of a fiberboard made of wood fiber,
The fiberboard has a constant density in the thickness direction by scraping the front and back surface layer portions of the fiberboard before thickness adjustment formed into a plate shape through a hot-pressure treatment to cause a core portion to appear . The base material for die cutting characterized by the above-mentioned.   The base material for die cutting according to claim 1, wherein the surface layer material is composed of at least two wood veneers having fiber orientation, and the wood veneers are arranged with their fiber directions orthogonal to each other. . A method for producing a base material for die cutting, wherein a surface layer material is attached to the surface of a fiberboard made of wood fiber,
Before the thickness adjustment, the raw wood chip is cut into small pieces, the synthetic resin that becomes the adhesive is added to the cooked and defibrated material, and then molded into a plate shape by hot-pressure treatment to obtain a fiberboard before thickness adjustment. A process of obtaining a fiberboard having a constant density in the thickness direction by scraping the front and back surface layer portions of the fiberboard to make a core portion appear, and attaching a surface layer material to the front and back surface of the obtained fiberboard The manufacturing method of the base material for die cutting characterized by including the process to attach.

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