JPS639960B2 - - Google Patents

Description

[Detailed description of the invention]

The present invention provides a method for producing a die board for paper carton punching that has excellent dimensional stability, can be punched out a large number of times per hour, has a long lifespan of punching, and has a large number of replaceable punching blades, and is strong and lightweight. This is what I am trying to do. Conventionally, the die board for paper carton punching uses plywood approximately 18 mm thick, which is formed from orthogonal Chinese veneer. However, in the case of plywood, the punching dimensions vary due to variations in raw wood and large dimensional changes due to changes in atmospheric conditions (temperature, humidity) during use, which limits the number of punches that can be punched per hour. ,
Furthermore, since the plywood is soft, there is a drawback that the number of punching cycles and the number of times the blade can be replaced is limited. Recently, materials stronger than conventional paper, such as rubber, plastic, asbestos boards, paper laminates, and paper-plastic laminates, are sometimes punched out. In addition, these strong materials can be used for items that require dimensional accuracy to prevent water leakage, such as water containers for milk cartons, alcohol cartons, etc., or conventional cardboard boxes, such as packaging containers for precision electrical and electronic parts. There are times when we punch out items that require much higher dimensional accuracy than cases. Furthermore, there are cases in which die boards for die boards for paper carton punching are required to have greater dimensional stability, as electronic components such as floppy disks are sometimes punched out that require a high degree of dimensional accuracy. On the other hand, paper carton punching machines have also improved, and previously they could cut 120 to 2,000 shots per hour.
Recent cutting machines made by Bobst (Switzerland) are now capable of producing 3,000 to 15,000 shots per hour, and die boards for paper carton cutting are increasingly required to have dimensional stability and robustness for high-speed punching. It's here. The performance of conventional china veneer plywood is insufficient to meet this requirement. In order to meet this requirement, some molds are used for punching die boards, but they are heavy and are not versatile.
In addition, there are disadvantages such as high cost. In addition, attempts have been made to improve plywood by using lauan veneer, beech veneer, maple veneer, etc. other than China veneer, but the dimensional changes due to changes in atmospheric conditions were large, and the number of punches that could be punched per hour was limited. There were drawbacks such as a limit to the number of times the blade could be replaced. As mentioned above, the reality is that no punching die board has ever been manufactured that is lightweight, inexpensive, and has excellent durability, robustness, and dimensional stability. The inventors completed the present invention after studying to improve the drawbacks of china veneer plywood and molds. The present invention has extremely excellent dimensional stability, which allows for a large number of punching operations per hour, as well as a long lifespan of punching blades and a large number of replaceable punching blades. The present invention relates to a manufacturing method. That is, multiple sheets of laminated cardboard containing 2 to 40% thermosetting resin and having a thickness of 0.5 to 2.6 mm, obtained by heating and pressing two or more layers of paper pulp mats, are inserted with resin between each sheet. , pasted by pressure, specific gravity 1.1-1.5, thickness 15-19
mm, volatile content is 3.5 to 0% in the manufacturing method of paper carton punching die board, the volatile content of the laminated cardboard is
It is characterized by being dried to a content of 3.5 to 0%, or dried to a volatile content of 3.5 to 0% during pressurized attachment. In the present invention, the pulp used for the laminated cardboard may be ordinary pulp, but among these, kraft pulp and kraft linter-mixed pulp are preferred, and if these are mixed with waste paper pulp,
A die board with excellent strength and dimensional stability and good durability can be obtained. Among kraft pulps, thick and long pulps obtained from coniferous trees are good, and among these, kraft pulps obtained from red pine, black pine, etc. are the best. The laminated cardboard that can be used in the present invention is obtained by paper-making the above-mentioned pulps so that they are intertwined, and then laminating two or more layers of pulp while wet with water under heat and pressure in a conventional manner.
Furthermore, in order to obtain multi-layered laminated cardboard, multiple pulp mats are wound around a drum, or they are placed in a predetermined case and dried appropriately using a conventional method, and then laminated under pressure and heat using a press. If the obtained cardboard is used, a die board with excellent strength and dimensional stability and good durability can be obtained. The pulp mat may have two or more layers, but preferably eight or more layers. Among these laminated cardboards, pressboard is particularly suitable as a dieboard material because it has excellent dimensional stability and strength. Even in these pressboards, the volatile content
If 3.5 to 0% is used, the dimensional stability is very good, and especially if 1 to 0% is used, the dimensional stability is very good. When making these laminated cardboards, it is also possible to add additives that are normally added when making paper, add inorganic base materials, organic base materials, or their fibers, or add fillers. . It is also possible to color laminated cardboard. A thermosetting resin is used as the resin contained in the laminated cardboard of the present invention. Unsaturated polyester resins and epoxy resins are particularly preferred, taking into account the reinforcement of the laminated cardboard, the dimensional stability, and the number of punches per hour. The amount of resin contained in the laminated cardboard is preferably 2 to 40%, preferably 5 to 30%. 2
% or less, the effect of imparting dimensional stability cannot be expected;
If it exceeds 40%, it becomes a cost. Regarding the size of resin inclusion, there are two methods: dissolve the resin in water during pulp mat papermaking, or finely crush the resin into 8 or more meshes and disperse it in water to obtain pulp mat, and laminate two or more layers of this, and ordinary pulp mat 2. There is a method of coating or dipping a cardboard obtained by laminating more than one layer. When performing coating impregnation or dipping impregnation, in the case of liquid resin,
One method is to use the resin as it is, and the other is to dissolve the liquid resin in water or an organic solvent such as an alcohol, a ketone, an aromatic compound, an ester, or a mixture thereof, or to use it by emulsifying it. In the case of solid resin, like liquid resin, it is used by dissolving it in water or an organic solvent. When the thermosetting resin 2 is contained inside the laminated cardboard 1 of the surface layer as shown in FIG. 3, it is preferably 1 to 30%. In this case, the same resin as the resin 3 normally used for coating and impregnating or pasting is impregnated under pressure. The thickness of the laminated cardboard is preferably 0.5 to 2.6 mm. If it is less than 0.5 mm, it will increase the cost, and if it is more than 2.6 mm, it will not be possible to obtain a paper carton die board with good dimensional stability even if it contains a thermosetting resin and is bonded with resin. The resin for pasting the laminated cardboard used in the present invention can be selected arbitrarily, but thermosetting resins such as melamine resin, urea resin, epoxy resin, and unsaturated polyester resin are preferred, and thermoplastic resins such as polyvinyl alcohol and vinyl acetate resin are preferred. Resin and vinyl acetate copolymer resin are good.
Modifications and mixtures of these resins may also be used.
In addition, tackifiers, plasticizers, softeners,
fillers, waxes, antioxidants, other additives,
You can also add. Methods for using this resin include a method in which it is applied directly to laminated cardboard, or a method in which it is impregnated or applied to a sheet-like fibrous base material and thereby the laminated cardboard is attached. In the former method, the amount of resin is 1 on the adhesive side of the cardboard.
1 to 500 g per square meter is good, preferably 4 to 300 g. If it is less than 1g, it will not be able to stick well, and if it is more than 500g, it will be costly.
Resin is wasted. In the latter method, paper,
Impregnating or coating cloth, nonwoven fabric, glass fiber cloth, etc. with resin. The amount of resin per 100 parts (parts by weight, same hereinafter) of this fibrous base material is preferably 30 to 200 parts, and 30 to 200 parts is good.
If it is less than 200 copies, sufficient adhesion will not be obtained, and if it is more than 200 copies, it will be costly. The thickness of the fibrous base material containing the resin to be adhered is preferably 0.05 to 0.5 mm; if it is less than 0.05 mm, sufficient adhesion and dimensional stability cannot be obtained.
If it is 0.5mm or more, it becomes costly. There is also a method of using resin in sheet form, but this method
9μ~0.4mm is good, preferably 30μ~0.2mm
The one is good. If it is less than 9μ, sufficient adhesion cannot be obtained, and if it is more than 0.4mm, it will be costly. In the present invention, the volatile content of the die board is 300mm×
When a test piece with a size of 300 mm×thickness is dried at 150° C. for 3 hours, 3.5 to 0% is good, and the range with the best dimensional stability is 1 to 0%. Volatile content 3.5%
In the above range of 15% or less, it has much better dimensional stability and robustness than China veneer plywood,
At 3.5 to 0%, the dimensional stability is very good even when 500,000 shots are continuously punched, and the number of punches per hour is large, while at 1 to 0%, there is almost no dimensional change. The specific gravity of the paper carton punching die board of the present invention is 1.1~
1.5 is good. If the specific gravity is less than 1.1, the desired dimensional stability cannot be obtained, and if it exceeds 1.5, it is heavy and impractical, and furthermore, processing of the die board is difficult and costs increase. The thickness of the die board of the present invention is preferably 15 to 19 mm.
If it is less than 15mm, it is difficult to fix the punching blade or folding blade.
If it is 19 mm or more, the rubber or spring for taking out the punched material cannot be used effectively. As a method of obtaining a paper carton die board with a volatile content of 3.5 to 0% according to the present invention, the die board contains 2 to 40% of a thermosetting resin obtained by heating and pressing two or more layers of paper pulp mat, and has a volatile content of 2 to 40%. One method is to use laminated cardboard that has been dried to a concentration of 3.5 to 0%, and the other is to use a laminated cardboard obtained by heating and pressing two or more layers of paper pulp matte containing 2 to 40% thermosetting resin. When pasting, there are methods such as applying pressure while heating and drying. In order to obtain a laminated cardboard with a volatile content of 3.5 to 0% containing a thermosetting resin of 2 to 40%, a method of coating or dipping the laminated cardboard with a volatile content of 3.5 to 0% and applying a thermosetting resin; There are a method of drying a laminated cardboard into which a thermosetting resin has been incorporated during paper making, and a method of drying a laminated cardboard after containing a thermosetting resin, and these methods can also be combined. The structure obtained by the present invention is (a) as shown in Fig. 1, in which multiple layers of laminated cardboard 1 containing 2 to 40% thermosetting resin are adhered with resin 2, (b) Fig. As shown in 2, a laminated cardboard 3 constituting a surface layer that does not contain a thermosetting resin and a plurality of layers of laminated cardboard 1 containing 2 to 40% of a thermosetting resin are pasted together with a resin 2. , (c) As shown in Figure 3, the thermosetting resin is
Laminated cardboard 4 constituting the surface layer containing 30% inside
and a plurality of layers of laminated cardboard 1 containing 2 to 40% thermosetting resin attached with resin 2, and (d) Figure 4
As shown in (a), the surface (both sides) of the structure of (a) is coated with synthetic resin 5 or contains a thermosetting resin.
It is coated with a fibrous base sheet 5 having a thickness of 0.05 to 0.5 mm. When a paper carton die board having the structure shown in FIGS. 1 and 4 is created, the surface can be matted or roughened to facilitate the attachment of rubber for taking out the punched product. In the case of FIGS. 1 to 4, the laminated paperboard containing 2 to 40% of thermosetting resin may be laminated in one direction, or in an orthogonal direction, or in some directions in the same direction and in some directions orthogonal to each other. When laminated cardboard containing thermosetting resin is pasted with resin, the paper is assembled and laminated as shown in each figure.
The lamination method is pressurized lamination by a conventional method such as press molding method or block lamination method. In this case, the pressure applied to the laminate is preferably 5 to 100 kg/cm ² , and the pressing time and temperature may be conditions suitable for the resin used, the thermosetting resin contained in the laminated cardboard, and the lamination method. The paper carton die board material obtained by the method described above is processed by mechanical methods such as sawing, cutting, and drilling, thermal methods such as carbon dioxide laser, or hydraulic processing such as Aquajet. Groove width for removing blade insertion: 0.7±0.05mm, 0.9±0.05
Machining mm grooves. A punching blade with a predetermined thickness is inserted into this groove. When punching paper such as graft paper, cardboard, cardboard, linter paper, rubber, plastic, asbestos, board, paper plastic laminate products, paper adhesive plastic laminate products, etc., use the conventional die board for punching paper cartons made of china veneer plywood. In comparison, the die board for paper carton punching obtained by the present invention has extremely good dimensional stability, can be punched out many times per hour, has excellent robustness and durability, and is lightweight. It is. Examples will be shown below (see FIG. 4). Comparative Example 1 Ten pieces of Chinese veneer with approximately the same thickness of approximately 1.85 mm were arranged orthogonally, and using urea adhesive, they were pressurized and heated using the normal plywood manufacturing method and sanded.
A paper carton die board material made of 18.2 mm Chinese veneer plywood was obtained. Comparative Example 2 A resin solution prepared by dissolving 100 parts of resol type phenol resin in 90 parts of methanol and 10 parts of water was prepared in a solution weighing 140 m².
A prepreg with a resin content of 60% was obtained by impregnating kraft paper (g) with the resin and drying it at 130°C for 10 minutes. In addition, a resin solution of 100 parts of melamine resin dissolved in 50 parts of methanol and 50 parts of water was impregnated into 90 g of kraft paper and heated to 135℃.
After drying for 15 minutes, a prepreg with a resin content of 53% was obtained.
11 sheets of press boards thicker than 1.6 mm, which correspond to JIS C2305 (1966), are orthogonally assembled, one sheet of the above-mentioned phenolic resin prepreg is inserted between them, and a total of 10 sheets of the above-mentioned melamine resin prepreg are placed on the surface, two sheets each. Stack 4 sheets, press and heat in a press at 130℃ 30Kg/cm ² for 1 hour, cool at the same pressure for 1 hour, and thicken.
A die board material for paper carton punching with a diameter of 17.0 mm, a specific gravity of 1.3, and a volatile content of 7.0% was obtained. Example 1 After drying 23 sheets of 0.8 mm pressboard corresponding to JIS C2305 (1966) at 110℃ for 1 hour, epoxy resin was applied.
100 parts of Ep-1001 (manufactured by Ciel Chemical Co., Ltd.) was immersed in a resin solution prepared by dissolving 8 parts of 4,4'diaminodiphenylmethane in 100 parts of acetone for 1 hour at room temperature, and then heated to 60℃ for 30 minutes.
It was further dried at 90° C. for 30 minutes to obtain a laminated cardboard with a volatile content of 0.6% and a resin content of 19%. 123 sheets of this resin-containing laminated cardboard were orthogonally assembled, and 1 phenol resin prepreg 2 used in Comparative Example 2 was placed between them.
A total of 22 sheets were inserted, and 4 sheets of the melamine resin prepreg 5 were stacked on top of each other, 2 sheets each, and heated under pressure in a press at 130°C and 30 kg/cm ² for 5 hours, and then cooled at the same pressure for 1 hour. A die board material for paper carton punching with a thickness of 17.1 mm, a specific gravity of 1.41, and a volatile content of 0.5% was obtained. Example 2 Approximately 1.2 pieces of kraft/linter mixed paper consisting of 30 layers
15 sheets of laminated cardboard of 50 mm thick, 57 parts of diallyl phthalate prepolymer, 3 parts of diallyl phthalate monomer,
40 parts of unsaturated polyester resin, 1 part of dicumyl peroxide, and 0.5 part of calcium laurate were dissolved in 100 parts of acetone, and the mixture was impregnated with the resin solution at 70°C.
Dry for 1 hour at 100°C for 5 minutes to remove the resin.
A laminated cardboard with a volatile content of 2.8% and a content of 14% was obtained. Kraft paper weighing 130 g per square meter was impregnated with the diallyl phthalate resin liquid and dried at 100° C. for 10 minutes to obtain a prepreg with a resin content of 50%. These prepregs 2 and 516 sheets were inserted on the surface of the resin-impregnated laminated cardboard 1 and between each, and heated to 300°C using a press machine.
It was heated under pressure for 2 hours at Kg/cm ² and cooled at the same pressure for 40 minutes to obtain a die board material for paper carton punching having a thickness of 17.2 mm, a specific gravity of 1.36, and a volatile content of 2.0%. The paper carton die board materials obtained in each of the Examples and Comparative Examples were processed using a 1 kilowatt carbon dioxide laser to create a paper carton die board.
A punching blade was embedded in this die board, and the number of times the detergent pack could be punched per punching time and the total number of punches possible were determined using a printing-linked punching machine manufactured by Zealand AG (West Germany). As shown in Table 1, compared to the china veneer plywood conventionally used as a cutting die, the die board of the example with less volatile content has good dimensional stability and can be punched out 2.7 times more times per hour.
The number of times the punching blade can be used for punching and the number of times the punching blade can be replaced is also very large. Also, because it has better dimensional stability than a laminated board with a volatile content of 7%, the number of punches per hour can be increased by 1.6 times. Furthermore, the dimensional change during punching of 100,000 shots was extremely good, less than ±0.01% for the material with a volatile content of 0.5%.

[Table] Comparative Example 3 100 parts of a novolac type phenolic resin, 10 parts of hexamethylenetetramine and 1 part of calcium stearate were kneaded with two rolls, pulverized with an atomizer mill, and then sieved and pulverized to 150 mesh or more. Akamatsu, Kuromatsu, and their waste paper were dispersed in water during papermaking, and 12% of this was incorporated into pulp48
A laminated paperboard having a volatile content of 6% and having a thickness of more than 1.5 mm was obtained. The phenol resin prepreg used in Comparative Example 2 was inserted between the laminated cardboard sheets one by one, and the paper was assembled in the same direction as the papermaking direction.
The material was heated and pressurized at 50 kg/cm ² at 50° C. for 1 hour, and then cooled at the same pressure for 30 minutes to obtain a die board material for paper carton punching having a thickness of 17.5 mm, a specific gravity of 1.36, and a volatile content of 6.5%. Example 3 20 parts of an unsaturated polyester resin consisting of maleic anhydride, terephthalic acid and propylene glycol, 1.5 parts of dicumyl peroxide and 2 parts of calcium stearate were added to 80 parts of diallyl phthalate prepolymer, and the resulting resin composition was mixed. Knead with two rolls, crush with an atomizer mill, and sieve.
Finely ground to 150 mesh or more. Red pine, black pine and these waste papers were dispersed in water during paper making and 13% was incorporated into the pulp to obtain a laminated cardboard with a volatile content of 6% and thicker than 1.5 mm and consisting of 48 layers. This was dried at 60° C. for 1 hour under a reduced pressure of 20 mmHg to reduce the volatile content to 0.8%. 112 sheets of this laminated cardboard and 2 or 513 sheets of the polyester-modified diallyl phthalate resin prepreg used in Example 2 were inserted one sheet at a time on the surface and between each sheet, and the paper was assembled in the same direction as the papermaking direction, and then placed in a press. Heat and pressurize at 140℃ for 1 hour at 50Kg/cm ² , cool for 30 minutes at the same pressure, and have a thickness of 17.4mm and a specific gravity.
A die board material for paper carton punching with a volatile content of 1.40% and a volatile content of 0.6% was obtained. Example 4 11 pieces of press boards of about 1.6 mm and 1 piece of 0.8 mm corresponding to JIS C2305, 100 parts of unsaturated polyester modified diallyl phthalate resin PB-220 (manufactured by Dainippon Ink), 20 parts of acetone and tertiary After applying a resin solution mixed with 1.5 parts of butyl peroxybenzoate using a roll coater,
After drying for minutes, a resin-impregnated laminated cardboard having a resin content of 12% and a volatile content of 7.5% was obtained. A resin solution prepared by dissolving 100 parts of epoxy resin Ep-1001 (manufactured by Ciel Chemical) and 12 parts of 4,4'diaminodiphenylmethane in 100 parts of methyl ethyl ketone was added to
It was impregnated into 166 g of glass cloth and dried at 110°C for 5 minutes to obtain a prepreg with a resin content of 55%. Laminated cardboard is
The paper is assembled so that the papermaking directions are alternately perpendicular to each other, and the prepregs 2 and 5 are inserted between the surfaces and between each of the 112 sheets of laminated cardboard, and heated at 140°C at 30kg/cm using a press machine. ² for 4 hours under pressure. During heating and pressurization, the pressure was released every 10 minutes to remove volatile components. After that, cool at the same pressure for 30 minutes,
A laminated board with a thickness of 17.0 mm, specific gravity of 1.42, and volatile content of 3.0% was obtained. This was dried at 40℃ for 3 hours and the volatile content was 2.5%.
A die board material for paper carton punching was obtained. The paper carton die board materials obtained in each of the Examples and Comparative Examples were grooved using Aquajet to create die boards for punching. A punching blade and a folding blade are embedded in this die board, and a pack for Teitsushi paper is punched out using a quick punching machine manufactured by Sugano Seisakusho Co., Ltd.
The number of punches possible per hour and the total number of punches possible were measured. As shown in Table 2, compared to the china veneer plywood conventionally used as a cutting die, the die board of the example has a lower volatile content and has better dimensional stability, so it can punch out 2.8 times more per hour.
The number of times the punching blade can be used and the number of times the punching blade can be replaced is also very large. Also, compared to resin-impregnated laminated boards with a volatile content of 6.5%, the dimensional stability is much better, and the number of punches per hour can be increased by 1.3 times. Furthermore, the dimensional change during punching of 100,000 shots is due to volatile matter.
The value of 0.6% was very good, less than ±0.01%.

【table】

【table】 [Brief explanation of the drawing]

1 to 4 are cross-sectional views of paper carton die boards obtained by the method of the present invention. 1... Laminated cardboard containing thermosetting resin, 2... Adhesive resin layer, 3... Laminated cardboard not containing resin, 4...
...Laminated cardboard containing thermosetting resin only on the inside,
5...Surface resin layer.

Claims (1)

[Scope of Claims] 1. A paper pulp matte containing 2 to 40% thermosetting resin, having a volatile content of 3.5 to 0%, and having a thickness of 0.5 to 2.6 mm, obtained by heating and pressing two or more layers of paper pulp mat. A paper carton with a specific gravity of 1.1 to 1.5, a thickness of 15 to 19 mm, and a volatile content of 3.5 to 0%, characterized in that multiple sheets of laminated cardboard are pasted together by inserting resin between each and applying pressure. A method of manufacturing a die board for punching. 2 Dry the laminated cardboard obtained by heating and pressing two or more layers of paper pulp mat to reduce the volatile content to 3.5 to 0%.
2. A method for manufacturing a die board for paper carton punching according to claim 1, characterized in that the die board is made to contain a thermosetting resin. 3 Claims characterized in that a laminated cardboard obtained by heating and pressing two or more layers of paper pulp mat is impregnated with a thermosetting resin and then dried to reduce the volatile content to 3.5 to 0%. The method for manufacturing a die board for paper carton punching according to item 1. 4. Claim 1, characterized in that a laminated cardboard obtained by heating and pressing two or more layers of paper pulp mat containing a thermosetting resin is dried to have a volatile content of 3.5 to 0%. The method for manufacturing the die board for paper carton punching described above. 5 Thickness containing 2 to 40% thermosetting resin obtained by heating and pressing two or more layers of paper pulp mat
It is characterized by pasting multiple sheets of laminated cardboard of 0.5 to 2.6 mm by inserting resin between each sheet and applying pressure while heating and drying.The specific gravity is 1.1 to 1.5 and the thickness is
A method for manufacturing a die board for paper carton punching with a diameter of 15 to 19 mm and a volatile content of 3.5 to 0%.