JPS6071199A - Die board for punching paperboard box - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] The present invention has excellent dimensional stability, can be punched out many times over time, has a long lifespan of punching, and has a punching blade that can be replaced many times, and is strong and lightweight. The present invention aims to provide a die board for punching paper cartons.

Conventionally, plywood with a thickness of about 18 fields, made of orthogonally formed Chinese veneer, is used for paper carton punching.

However, in the case of plywood, the punching dimensions vary due to variations in the raw wood and large dimensional changes due to changes in the atmospheric conditions (warmth, humidity) during use. There are disadvantages such as the number of times that can be punched is limited, and the softness of the VC plywood limits the number of times the punching can last and the number of times the blade can be replaced.

Recently, there has also been a new type of punching machine for punching materials that are stronger than conventional paper, such as rubber, plastic, Aspes), r-do, laminated products, and paper-plastic laminated products. In addition, these strong materials can be used for items that require dimensional accuracy to prevent water leakage, such as milk cartons, water containers for alcoholic beverages, cookware, etc., or conventional cardboard boxes such as packaging containers for precision electrical and electronic parts. There are cases when punching items that require much higher dimensional accuracy than cases. Furthermore, dimensional stability is increasingly required for die boards for paper carton die-cutting, such as when punching electronic components such as floppy disks that require a high degree of dimensional accuracy.

Meanwhile, paper carton punching machines have also improved, making it possible to cut 15,000 shots per hour, up from 30 QO shots per hour.
Dimensional stability and robustness against high-speed punching are increasingly required for paper carton punching gooses and +p-dos.

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 and cutting, but there are disadvantages such as the heavy weight, which makes it unsuitable for general use, and the cost is high. Attempts have also been made to improve sheets other than China veneer, but the drawbacks include large dimensional changes due to changes in atmospheric conditions, a limit to the number of punches that can be punched per hour, and a limit to the number of times the blade can be replaced. was there.

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 have improved the drawbacks of china veneer plywood and molds, making them robust, having good dimensional stability, and allowing for a large number of punches per hour. We have been studying paper carton die-cutting die boards, which have many types.

As a result, it was discovered that a structure in which a synthetic resin is combined with a laminated cardboard obtained by heating and pressurizing two or more layers of paper-making Zorzomat has excellent properties (Patent Application No. 57
-130371, Japanese Patent Application No. 57-130372, Japanese Patent Application No. 57-130373, Japanese Patent Application No. 56-45949)
. As a result of further investigation, we discovered a configuration with extremely good dimensional stability when using Guiboard.

The present invention was invented as a result of cutting down the material of f in valley A, and the dimensional stability is very poor, so the number of punches that can be punched per hour is large, and the number of punching durability of the punching blade is low. This invention relates to a die board for paper carton punching that is strong and lightweight and has a punching blade that can be replaced many times.

In other words, from a stack of 6 to 36 pieces of laminated cardboard with a thickness of 0.5 to 2.6 mm obtained by heating and pressing two or more lumps of paper/matrix mats and pasted with resin, ≠ material for the board. The laminated cardboard constituting at least the inside contains 2 to 40% (by weight, the same hereinafter) of a thermosetting resin, has a specific gravity of 1.1 to 1.5, a thickness of 15 to 19 tnm, And the volatile content is 3.5 ~ ^ The die board for paper carton punching has much better dimensional stability than the cardboard laminated die board that the inventors have conventionally used to grind. I found that it is suitable for

In the present invention, the pulp used for the laminated paperboard may be any pulp with suitable sound, but among these, a mixture of kraft pulp and kraft linter pulp is preferable, and if a mixture of these and waste paper pulp is used, strength and dimensions can be stabilized. excellent in sex,
A highly durable Gui board can be obtained. Among kraft pulps, thick and long pulps obtained from coniferous trees are good, and among these, kraft/4' 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-layer laminated cardboard, multiple pulp cloaks are wound around a drum, or they are placed in a predetermined case and dried appropriately using a conventional method, and then heated under pressure using a press for 8* layers. If the cardboard thus obtained is used, a die board with excellent strength and dimensional stability VC and good durability can be obtained. It is sufficient that the luglunomat has two or more layers, but preferably eight or more layers. Among these laminated cardboards, pressboard is particularly suitable as a die board material because it has excellent dimensional stability and strength. Among these presspods, the volatile content is 3.5~
If 0% is used, the dimensional stability is very good, and especially if 1 to Q% is used, the dimensional stability is very good. An example of the response board is J Engineering S 0230.
5 (1966), BS-231 (1967), D Engineering N-7733 (1962), ASTM D-130
5 (1973), the volatile content is 3.5 to 0%, and preferably 2L<ldl to O. When making these laminated cardboards, additives that are usually added when making paper, entangling the material, shape material, or their fibers, or adding fillers are added. You can also do it. It is also possible to color laminated cardboard.

As the resin contained in the laminated cardboard of the present invention, a thermosetting resin is used in order to obtain a dyne hoard for paper carton punching that has good dimensional stability and can punch out as many as 9 punches per hour. However, in order to obtain a die board for paper carton punching that has better dimensional stability and can be punched more times per hour, the heat distortion temperature must be 60 C or higher (ASTM D-548).
Thermal expansion coefficient is 20 x 10 (ASTMP-696)
Thermosetting resins having the following properties are preferred.

Considering the reinforcement of the laminated cardboard, the dimensional stability, and the number of punches per milling time, unsaturated polyester resins and epoxy resins are suitable as the resins to be used. The amount of resin contained in the laminated cardboard is preferably 2 to 40%, preferably 5 to 40%.
Article 30. If it is less than 2 inches, no effect of imparting dimensional stability can be expected, and if it is more than 40 inches, the cost will increase.

Methods for incorporating resin include dissolving the resin in water during pulp cloak papermaking, or finely crushing the resin into 8 or more meshes and dispersing it in water to obtain a valve mat, and laminating two or more layers of this, and the usual method. There is a method of coating or impregnating or dipping a cardboard obtained by applying 2N or more of Gurzomat. When performing coating impregnation or dipping impregnation, in the case of liquid resin, there are two methods: using it as it is, and adding liquid resin to water, alcohols, ketones, aromatics, esters, and other additives, and mixtures thereof. , emulsion and use. In the case of solid resin, it is used by soaking it in water or organic solvent like liquid resin. As shown in Figure 3, the surface layer of laminated cardboard (1)
When containing thermosetting resin (2) inside, 1 to 3
0% is good. In this case, the same resin as resin 1 (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 Nn.

If it is less than 0.5, the cost will be high, and if it is more than 2.6, 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 is
Since the cardboard is reinforced with a thermosetting resin that has good dimensional stability, it can be selected arbitrarily, but in order to obtain a die board that is robust and has good dimensional stability, it is important to consider the characteristics of the resin in terms of dimensional stability. Heat distortion temperature of 60℃ or higher (ASTM
D-648), thermal expansion coefficient of 20 x 10-5 or less (A
ST114 D-696), in terms of strength, bending strength is 5K
ylπj or more (J Engineering 5K6911) is preferable. Among these, good thermosetting resins include melamine resin, urea resin, epoxy resin, and unsaturated polyester resin, and good thermoplastic resins include polyvinyl alcohol, vinyl acetate resin, and vinyl acetate copolymer resin. Modified products and mixtures of these resins are also used. In addition, tackifiers, plasticizers, softeners, filling firmness, waxes, antioxidants, and other additives are added to these resins.
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 the laminated cardboard is adhered thereto. In the former method, the amount of resin is 1 to 5 per 111 square meters of cardboard pasted.
00? is good, preferably 4 to 300 g. 12
If it is less than 5 feet, sufficient adhesion cannot be achieved, and if it is more than 5 feet, the cost will be high and the resin will be wasted. In the latter method, paper, cloth, nonwoven fabric, glass fiber cloth, etc. are impregnated or coated with a resin in a conventional manner. The amount of resin per 100 parts of the fibrous base material is preferably 30 to 200 parts; if it is less than 30 parts, sufficient adhesion cannot be obtained, and if it is more than 200 parts, the cost will be high. The thickness of the fibrous base material containing the resin to be adhered is preferably Q-05 to 0-5 typ+, and if it is less than 0.05+m, sufficient adhesion and dimensional stability cannot be obtained;
Above is the cost. There is a method of using resin in the form of a sheet, but for this method, it is best to use a sheet with a thickness of 9μ to 0.4 degrees, preferably a thickness of 9μ to 0.2. If it is less than 9μ, sufficient adhesion cannot be obtained, and 0.4ra
If it is more than n, the cost will be high.

The volatile content of the die board of the present invention is preferably 3.5% to 0% when a test piece of 300 mm x 300 mm x thickness is dried at 150°C for 3 hours, and the XA range with the best dimensional stability is 1 to 0%. I can get 0. In the range of volatile content of 3.5% or more and 15% or less, it has much greater dimensional stability than China veneer plywood.
Excellent robustness, but MM for 3.5-095,
Dimensional stability is very good even after 50 minutes of shot punching.
It can be punched out many times per hour, and there is almost no dimensional change at 1% to 0%.

The specific gravity of the paper carton punching die board of the present invention is 1.1 to 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. 15-19 side is good, punching blade for 15 pieces or less,
It is difficult to fix the folding blade, and if there are more than 19 holes, the comb and spring for taking out the punched material cannot be used effectively.

As a method for obtaining a paper carton die board with a volatile content of 3.5 to 0% according to the present invention, heat blowability (resin of 2 to 40%
A method of using laminated cardboard that has been dried until the volatile content of When pasting materials containing ~40% with resin, there is a method such as applying pressure while heating and drying.
In order to obtain laminated cardboard with an Htt element content of 3.5 to 0%, the volatile content of the laminated cardboard is reduced to 3.5 to 0%, and a thermosetting resin is coated or impregnated with a thermosetting resin. A method of drying a laminated cardboard into which a curable resin has been incorporated, and a method of drying a laminated cardboard after containing a thermosetting resin are required.
It is also possible to combine these methods.

The structure of the present invention is as follows: (a) As shown in Fig. 1, laminated cardboard (1) containing 2 to 40 strips of thermosetting resin is pasted with Jugetsu Nao 2), (b) Fig. As shown in 2, a laminated cardboard (3) that does not contain a thermosetting resin and a laminated cardboard (1) containing 2 to 40 parts of a thermosetting resin, which constitute the surface layer, are pasted together with a resin (2). (C) As shown in Figure 3, a laminated cardboard (4) containing 1 to 30% thermosetting resin on the inside and 2 to 40% thermosetting resin constituting the surface layer. (1) As shown in Figure 4, the surface (both sides) of the structure of (a) is covered with synthetic resin (5). It is either plated or covered with a 0.05 to 0.5 tone fibrous base sheet (5) containing a thermosetting resin.A paper container having the structure shown in Figs. 1 and 4. When creating a punching die board, the surface can be made matte or roughened to make it easier to attach the rubber to take out the punched product. The laminated paperboard containing 2 to 40% of a synthetic resin may be laminated in the same direction, or perpendicularly, or partly in the same direction and partly in the orthogonal direction.

When pasting laminated cardboard containing thermosetting resin with resin,
Assemble and stack the papers as shown in each figure.

The lamination method is pressure lamination using conventional methods such as mens molding method and block lamination method. In this case, the pressure is 5 to 1
00Kf/cFA is good, and the pressurization time and temperature may be conditions suitable for the resin used, the thermosetting resin contained in the laminated cardboard, and the lamination method.

The above-mentioned sticky die board material for paper carton punching is punched out by machine Ll'J methods such as jig sawing, cutting, and drilling, thermal methods such as carbon dioxide laser, or hydraulic processing such as Aqur jet. Insertion groove width 0.7 soil 0,
05 gate, 0.9±0.05 cocoon etc. groove processing. A punching blade of a predetermined thickness is inserted into this groove.

Kraft paper, cardboard, Dan H? - Le, Su/Tar paper, etc. I)
! 6 'JA ya, com, plastic, asbestos,
When punching 21f paperboard, paper-glass-laminated products, paper-bound 21f hard-glass laminate products, etc., the die board for paper carton punching of the present invention has a smaller size than the conventional paper carton die-cutting die board made of plywood paperboard. It has good stability, can be punched many times over time, and is robust.
It has the features of being highly durable and lightweight.

Examples will be shown below.

Comparative Example 1 Ten pieces of Chinese veneer weighing about 1.85g++ were arranged orthogonally, and using urea adhesive, they were pressurized and heat formed using a normal plywood manufacturing method, and then sanded and finished, resulting in a 17.9mm Chinese veneer. A die board material for punching plywood paper cartons was obtained.

Comparative Example 2 Laminated cardboard 1 consisting of 48 layers of kraft/linter mixed paper
．． 9 Thick one 9 Thick polyurethane sheet between 8
Insert each sheet one by one and press at 140℃ for 15 minutes.
Heat and pressurize at K9/ch4 for 60 minutes and then pressurize at the same pressure for 15 minutes.
Cool for minutes to a thickness of 18.2 mm (approx. 1.7 thick cardboard, approx.
．． 3 polyurethane sheet), specific gravity 1.15, volatile content 7
A die board material for punching paper cartons was obtained.

Implementation row l J Engineering S O2305 (1966) approximately 1.61
1III! A thick press board was dried at 130°C for 50 minutes to reduce the volatile content to 0.1% or less, and 10 parts of unsaturated polyester resin, RT-400 (manufactured by Mitsui Toatsu, a low-shrinkage pace resin) and R-372 ( A mixture of 90 parts of Mitsui Toatsu (manufactured by Mitsui Toatsu) and 1 part of BPO paste was added to a liquid resin for 48 hours at room temperature.
A laminated cardboard containing 23 parts of resin was obtained. On the other hand, 57 parts of diallyl maphthalate preboliky, 3 parts of diallyl phthalate monomer, unsaturated polyester resin (R-372)
40 parts of BPO paste and 0.5 parts of calcium laurate dissolved in 100 parts of acetone were impregnated into 200 m2 kraft paper and dried at 100°C for 10 minutes to obtain a resin amount of 50 parts.
% prepreg was obtained. 10 sheets of this Silipreg (2) and the laminated cardboard (IJII sheet) were assembled into the configuration shown in Figure 1, and pressed at 140°C and 40 kg/c using a press machine.
Heat under pressure for 60 minutes at rA, cool for 1 minute at the same pressure,
A die board material for paper carton punching with a thickness of 17.0 mm, a specific gravity of 1.42, and a volatile content of 0.1 parts or less was obtained.

Example 2 Approximately 2+ corresponding to J Engineering EI 02305 (1966)
++m thick press board with epoxy resin BP-100
1 (Shell Chemical Exhibition) 100 parts of '4,4' noaminodiphenylmethane dissolved in 200 parts of acetone was immersed in a cloth for 4 hours at room temperature and dried at 60°C for 1 hour, containing 16% resin content. A laminated cardboard with a volatile content of 5.5% was obtained. 100 parts of epoxy resin Ep-1001 and 12 parts of 4,4' noamino diphenylmethane were added to 10 parts of methyl ethyl ketone.
The varnish dissolved in 0 parts J-Ko S R3414 (Bias
-13) A glass cloth of 166 tons per square meter was impregnated and dried at 110° C. for 5 minutes to obtain a Noripreg with a resin content of 55%. The 10 sheets of prepregs (2) and (5) and the 9 sheets of the laminated cardboard (1) were assembled alternately so that the papermaking direction of each sheet of laminated cardboard was perpendicular to each other, and the paper was assembled into 140 sheets in the configuration shown in FIG. 4. ℃, heated and pressurized for 120 minutes at 50 images/tll, cooled for 15 minutes at the same pressure, and processed with a gas laser and router with a thickness of 17.8 mm, volatile content of 3.2, and specific gravity of 1.27. A die board for paper carton punching was created by cutting grooves in the mold, inserting a punching blade, and attaching a rubber spring.

A 1000mm water container was punched out using a printing slow-acting punching machine made by Swiss Bobst from a 10mm thick liquid paper that had been treated with resin to make it waterproof. The number of service life, number of punching service life, number of times the blade can be replaced, etc. were measured. As shown in Table 1, compared to china veneer plywood, which was conventionally used for punching, it has better dimensional stability, so the number of punches per hour can be approximately three times, and the number of punching cycles of the punching blade has increased. The number of times the sword can be replaced is quite large. In addition, since the dimensional stability is better than that of the core layer pod, which has a volatile content of 7%, the number of punches per hour can be approximately doubled.

Furthermore, in Example 1, the dimensional change during shot punching for 50 minutes was ±0.02'A because the volatile matter was less than 1 inch.
It was very good as shown below.

Comparative Example 3 Approximately 0.1 an ethylene-vinyl acetate co-polymerized resin sheet was placed as an adhesive film between each of 12 thick sheets (#1, 5, etc. corresponding to Pressport DIN-7733 (1962)). Put it in a press at 140℃,
The material was heated and pressurized at 5iJkεg/tt for 30 minutes, and cooled during the application period at the same pressure to obtain a dipode material for paper carton punching having a thickness of 18.1 m, a specific gravity of 1.2, and a volatile content of 7.

Comparative example 4 Approximately 1.7m corresponding to JIS C2305 (1966)
Unsaturated polyester M-210 on m-thick press board
1 (manufactured by Mitsui Toatsu) and 1 part of BPD base) were dissolved in 710 parts of acetate and a resin solution was applied with a roller.
It was dried at 0° C. for 100 minutes to obtain a laminated cardboard containing 12% resin. On the other hand, 130 tons of kraft paper was impregnated with the polyester-modified diallyl phthalate resin solution used in Example 1, and dried at 100° C. for 10 minutes to obtain Noripreg with a resin content of 50%. The nine sheets of laminated cardboard and the Silipreg 1
0 sheets alternately and JIS O2305 (
1966), two sheets of press pods with a bleached thickness of 800 ml were assembled into the configuration shown in Figure 2, and heated at 140°C in a press.
, heat under pressure for 60 minutes at Kg/tri, 17.
4 bleached, specific gravity 1.30. A dipode material for paper carton punching with a volatile content of 4.0 was obtained.

Example 3 Epoxy resin El) = IQQl (Shell Chemical Exhibition) 10
0 parts, 9 parts of 4.4' diaminodiphenylmethane, and 1 part of calcium stearate were kneaded with two rolls, crushed with a γ tomizer mill, and sieved to a fine powder of 100 mesh or more. Disperse in water and incorporate 12% into pulp to obtain 1.5 thick laminated cardboard consisting of 481. This was heated at 60°C for 1 hour at 20 rr.
It was dried under reduced pressure of an Hf to reduce the volatile content to 0.4% or less.

Press board corresponding to JIS-02305 approximately 1.60
Of these, 100 parts of @IIK Ep-1001 and 9 parts of 4,4'diaminophonylmethane were dissolved in 100 parts of acetone, applied with a roller, and further dried at 60°C to obtain cardboard containing 8% of resin. . This is heated at 60℃ for 1 hour'A)r
It was dried under reduced pressure of mnHl to reduce the volatile content to 0.4% or less. B11 Greased laminated cardboard (1) 10 sheets are stacked so that the papermaking directions are alternately orthogonal, the Noripreg (2) obtained in Example 2 is inserted between each, and both surfaces are coated with the inner surface resin. Place cardboard (4) and heat to 140℃ as shown in Figure 3.
, heated and pressurized at 5oKp/i for 40 minutes, cooled during addition at the same pressure, and had a thickness of 17.1 mm, specific gravity of 1.38, and volatile content of 0.
．． A 2% dipode material for paper carton punching was obtained.

Example 4: Approximately 0.0% as specified in ASTM D-1305 (1973).
8.Thick press board made of unsaturated polyester resin PE
3-951 (manufactured by Dainippon Inn: P) and 21.5 parts of Pergchill were mixed and coated on both sides with a roll coater.
After the drying time, both sides were coated, and 24 hours later, both sides were coated to obtain a laminated cardboard containing 16% resin.

In addition, kraft paper with a weight of 130 m2 was impregnated with a varnish made by soaking 100 parts of melamine/formaldehyde resin (methylol type) in a mixed solvent of 50 parts of methanol and 50 parts of water, and dried at 110°C for 10 minutes to reduce the amount of resin bO. % prepreg was obtained. The 22 sheets of the laminated cardboard (1) and the sheets of the Noripreg (2) are laminated alternately, and the paper is assembled so as to have the configuration shown in FIG. Press machine at 130℃, 00 edges/cd at 1
Pressure and heat dry for 120 minutes intermittently at 0 minute intervals, cool for 40 minutes at the same pressure, and process a die board for paper carton punching with a thickness of 17.8 inches, a ratio of 1.32 inches, and a volatile content of 2.8 inches. A die for punching was created. A blade was embedded in this dipode, and a tobacco egg case was punched out of 0.5 mm thick kraft paper using a Swiss Bobst Autoplaten Tights punching machine. The number of times the punching blade can be used for punching, the number of times the blade can be replaced, etc. were measured. As shown in Table 2, the number of punches that can be punched per hour is approximately three times that of the plywood plywood that was conventionally used as a cutting die, and the number of punching durability and the number of times that the knife can be replaced is also significantly higher. . Also, since the dimensional stability is better than that of a laminated board with a volatile content of 7, the number of punches per hour can be approximately doubled. Furthermore, in Example 3, the dimensional change during punching of 100,000 shots was extremely excellent, with volatile content being less than 10, ±0.01%.

[Brief explanation of the drawing]

1 to 4 are cross-sectional views of dipodes for punching paper cartons obtained according to actual examples of the present invention. (1) Laminated cardboard containing thermosetting resin (2) Adhesive resin layer (3) Laminated thickest paper that does not contain resin (4) Laminated cardboard containing thermosetting resin only on the inside (5) Surface resin layer patent Applicant Sumitomo Bakelite Co., Ltd. Figure 1 Figure 2 Figure 3 Cause Figure 4

Claims (4)

[Claims] (1) A laminated cardboard with a thickness of 0.5 to 266 mm obtained by heating and pressing two or more layers of paper/Grun° mat and containing a thermosetting resin of 2 to 40 layers. Pasted with 1 loaf, □ ~ 0.5, thickness 156 ~ 191 m,
In addition, a yui board for paper carton punching with a volatile content of 3.5% to 0%. (2) Laminated cardboard 4 to 34 containing the thermosetting resin
A die board for paper carton punching according to claim 1, wherein the die board is laminated on both surfaces of the same cardboard not containing a thermosetting resin, and is bonded with gold and resin. (3) Lamination thickness g4 to 34 containing the thermosetting resin
A die board for paper carton punching according to claim 1, wherein a same laminated paper laminated on both surfaces and containing 1 to 30 parts of thermosetting resin only on the inside is adhered with resin. . (4) Laminated cardboard 6 to 36 containing the thermosetting resin
and a sheet of a fibrous base material of 0.05 to 0.5 mm coated with a synthetic resin on its surface (both sides) or containing a thermosetting resin, which is adhered with a resin. The die board for paper carton punching described in item 1.