JPS6017678B2 - Die board for paper carton punching - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION It is an object of the present invention to provide a die boat for paper carton punching that has a long lifespan of punching, a large number of times the punching blade can be replaced, excellent dimensional stability, and is strong and lightweight.

That is, 3 layers of laminated cardboard with a thickness of 0.11cm to 15cm thick obtained by heating and pressurizing two or more layers of paper pulp mats.
The sheet to 15cm is made of thermosetting resin or thermoplastic resin, with a specific gravity of 0.6 to 2.2 and a thickness of 12cm.
This relates to a die boat for punching paper cartons that extends from the legs to the 22nd side and has a volatile content of 15% or less. Conventionally, a die boat for punching paper cartons uses plywood with a thickness of approximately 18 ribs, which is formed by orthogonally forming a single Chinese veneer.

However, in the case of plywood, the raw wood may fluctuate, and the Z-air condition (
There are disadvantages such as the fact that the punching dimensions vary due to large dimensional changes due to changes in temperature and humidity (temperature, humidity), and the number of punching cycles is limited because the plywood is soft. In addition, recently, rubber, plastic, asbestos porcelain, paper laminates, high-grade plastic laminates, etc. are often punched, so dimensional stability and robustness are increasingly required for paper carton punching die boats. It has become.

The performance of conventional china veneer plywood is insufficient to meet this demand. In order to meet this requirement, some molds are used for punching die boards, but they are heavy and
The key points are that it is not versatile and is expensive.

As mentioned above, it has excellent durability, robustness, and dimensional stability.
At present, there is no punching die board that is lightweight and inexpensive. The present invention relates to a die port for paper carton punching that improves the drawbacks of china veneer plywood and molds, is robust, has good dimensional stability, is lightweight, and has a long lifespan of blade punching and a large number of blade replacements. be.

In the present invention, various plywoods were studied in order to improve the drawbacks of conventional plywood plywood, but no satisfactory results were obtained.

Furthermore, as a result of examining various materials, two or more layers of paper pulp mats were laminated under heat and pressure as a material for a die boat for punching paper cartons. 3 of laminated cardboard with thickness from 0.11 to 15 ribs
The sheets to 150 are made of room-temperature curing or heat-curing thermosetting resin or thermoplastic resin, with a specific gravity of 0.6 to 2.2 and a thickness of 12 sails to pine skin. We discovered that the cardboard laminated board with a volatile content of 15% or less is extremely strong and has good dimensional stability, and is suitable for die ports for punching paper cartons. The pulp used in the present invention can be any pulp, including kraft valve,
By using a mixture of linter pulp, kraft valve, or a mixture of these waste paper pulps, a dipode with excellent strength and dimensional stability and good durability can be obtained.

Among the craft pulps, the thick and long pulp obtained from coniferous trees has excellent craftsmanship. The cardboard that can be used in the present invention is made by making the above-mentioned pulps so that they intertwine, and then heating, pressurizing, and dehulling two or more layers of pulp mats while wet with water in a conventional manner to obtain a laminated cardboard. In order to obtain even more multi-layered cardboard, the pulp mat can be wound around multiple drums, or it can be placed in a designated case, dried properly using a conventional method, and then pressurized and heated using a press. If you use the obtained cardboard,
A die board with excellent strength, dimensional stability, and durability can be obtained. The valve mat may have two or more layers, but preferably eight or more layers. Among these laminated cardboards, pressboard is suitable as a die board material because it has excellent dimensional stability and strong strength. Examples of pressboard are JIS-C-2305 (1966), BS-2
31 (1967), DIN-77 (1962), AS
There are some that meet standards such as TM-D-1305 (1973). For the laminated cardboard used here, water-insoluble thermosetting resin or thermoplastic resin is finely ground to 8 mesh or more, dispersed in water during sanding to obtain a pulp mat, and two or more layers of this are laminated, or Add thermosetting resin or thermoplastic resin to the cardboard obtained by laminating two or more layers with water or alcohol.
It is preferable to concentrate and impregnate by emulsifying or dissolving in organic solvents such as ketones, aromatics, esters, etc., or mixtures thereof. When injecting or impregnating such resin, it is best to use 1% to 30% of the laminated cardboard, and if it is less than 1%, no effect of increasing strength or imparting dimensional stability can be expected; if it is more than 30%, The cost will be high. This laminated paperboard may also contain sizing agents, hollenders and other additives used in wet-end storage, or inorganic or organic substrates.
Alternatively, the amount can be increased by adding such fibers or other additives. The laminated cardboard used here can also be colored. These laminated cardboards have better adhesive impregnation and adhesion than normal plywood wood, so the laminated boards are strong, have good dimensional stability, and are strong enough to be used as plywood. Compared to plywood, it is superior in terms of the number of times it can be punched out and the number of times the blade can be replaced.

As the resin used in the present invention, a thermosetting resin or thermoplastic resin of a room temperature curing type or a heat curing type is used.

Thermosetting resins that harden at room temperature can be selected arbitrarily, but the resin properties include bending strength of 5 kg/ground or more (JIS-K-6911), and dimensional stability of 40°C at the heat distortion temperature. (ASTM-D-648) thermal expansion coefficient of 3
It is preferably 0x10-51/°C or less (ASTM-D-696) or less. Furthermore, non-condensed resins have excellent adhesion, such as epoxy resins and unsaturated polyester resins. Heat-curing thermosetting resins can be selected arbitrarily, but among them, the strength of the resin is 5 kg/1 in terms of bending strength.
It is preferable that the material has a lightness (JIS-K-6911) and a dimensional stability of 40° C. or more at a thermal deformation temperature and a thermal expansion coefficient of 30×10-51/° C. or less. Taking cost and adhesion into consideration, urea resins such as melamine resins, phenolic resins, unsaturated polyester resins, diallyl phthalate resins, and epoxy resins are good; among these, the best are melamine resins,
Epoxy resin, unsaturated polyester resin. Thermoplastic resins can be selected arbitrarily, but among them, resins with a Rockwell hardness of 110 or less on the M scale tend to stick together when pressed, and those with a heat distortion temperature of 130 qo or less tend to stick together when heated. Among them, the tensile strength is 30k9/ground (ASTM
-D-6th round) Dimensional change should preferably be 30 oo or more at heat distortion temperature and 30 x 10-51/°C or less at thermal expansion coefficient. Among these thermoplastic resins, polyvinyl alcohol, ethylene-vinyl acetate copolymer, vinyl acetate resin, vinyl chloride resin, polyamide resin, vinyl chloride-vinyl acetate resin, acrylic resin, polyurethane resin, etc. have poor adhesion. Also used are modified mixtures of the above adhesives.Tackifiers, plasticizers, softeners, fillers, waxes, antioxidants, and other additives can also be added to these adhesives. It is also possible to use these adhesives by dissolving them in water or organic solvents such as alcohols, ketones, aromatic esters, and mixtures thereof, or by emulsifying them.
The structure of the resin 2 and the laminated cardboard 1 of the present invention is to apply the resin 2 between the laminated cardboard 1 as shown in FIG. There is a method in which resin 2 is applied and the surface is also coated with resin 2 and adhered.

In the case of FIG. 2, the outside coated with resin 2 may be covered with another resin or Shigeru pattern paper 3 as shown in FIG. When laminated cardboard and resin are bonded, the type of resin in each layer may be the same or different. When pasting the laminated cardboard and resin, the type of resin in each layer may be the same or different. When pasting laminated cardboard with resin, apply or insert it on one or both sides of the laminated cardboard in the usual manner so as to have the configuration shown in Figures 1 and 2, and then assemble the paper as shown in Figures 1 and 2. and laminate. The lamination method is a conventional method of laminating under pressure, such as a press molding method or a block lamination method. In this case, the pressure applied to the laminate is preferably from 0.5K9 to 70K9, and the pressure time and temperature may be determined depending on the resin used, the laminated cardboard, and the lamination method. In the present invention, the thickness of the resin to which the cardboard is attached is preferably 1 to 400 yen per square meter of the mottled surface of the cardboard, preferably 4 to 300 yen.
00 evening is good.

If it is less than 1 tare, sufficient adhesion cannot be achieved, if it is more than 400 tares, the cost will be high, and if it is more than this, the resin will be wasted.

The thickness of the laminated cardboard of the die boat for paper carton punching of the present invention is 0.
．． From 11 ribs to 15 pigs is good, preferably from 0.4 willow to 9 ribs.

If it is less than 0.11 ribs, the cost will be high, and if it is more than 15 ribs, even if it is attached with resin, the strength of the die board will be weak and the dimensional stability will be poor, and it will not be possible to satisfy the target performance. .

The number of laminated cardboard sheets of the die boat for paper carton punching of the present invention is 3.
It is good to have from 1 to 15 fathers, preferably from 4 to 2q women. If there are less than 3 pieces, the target strength cannot be obtained, and if more than 150 pieces, the cost will be high.

The volatile content of the die boat for paper carton punching of the present invention is 15 pi.
For drying, 15% or less is good, preferably 12% or less.

If the volatile content exceeds 15%, the dimensional stability, robustness, and cuttability during die board production will be adversely affected. The specific gravity of the dieport for punching paper cartons of the present invention is preferably from 0.6 to pine, preferably from 0.8 to 1.8.

When the specific gravity is less than 0.6, the density becomes a problem and the die board loses its robustness, and when it exceeds 2.2, it becomes heavy, impractical, and increases in cost. The thickness of the die board of the present invention is preferably from 12 sides to 22 ribs, preferably from 14 sides to 1 side.

It is difficult to fix the punching blade unless it is smaller than IZ, and if it is smaller than IZ, it becomes impossible to use the rubber or spring effectively to take out the punched object. The above-mentioned sticky die boat for paper carton punching can be inserted by mechanical methods such as scroll sawing, cutting, and drilling, thermal methods such as carbon dioxide laser, or hydraulic processing such as Aqua Jutsu. Foundation middle 0.7±0.05 side, 0.
9±0.05 kite, 1.5 shi 0.05 etc. foundation processing.

A punching blade with a predetermined thickness is inserted into this groove. When punching paper such as kraft paper, cardboard, cardboard, linter paper, rubber, plastic, asbestos, board, paper-plastic laminates, paper-adhesive laminates, etc., compared to the conventional paper carton die-cutting die boat made of plywood plywood. The punched diepod obtained by the present invention can be punched many times, has excellent dimensional stability, robustness, and durability, and is lightweight.

Examples will be shown below.

Comparative Example 1 Chinese veneer boards with approximately the same thickness of about 1.85 ribs were arranged orthogonally, and using urea adhesive, they were pressurized and heated in a press using the usual plywood manufacturing method, and sanded. and
17.9 Cape China veneer plywood paper carton die boat material was obtained.

Example 1 Three pieces of press board JIS-C-2305 (1966) compliant (two pieces thicker than 2 kites, one piece thicker than 14 pigs) were placed on the adhesive surface in the configuration shown in Figure 1. Apply an aqueous solution of urea formaldehyde resin with a thickener added, and
After drying at qo for 5 minutes, insert one structure into each stage using a press machine, heat and pressurize for 3 minutes at a temperature of 15 psi and a pressure of 50 k9 in the evening to adhere. , urea adhesive, approximately 14 ribs cardboard, urea adhesive, approximately 2 ribs cardboard) Materials for paper carton die-cutting type Dariports having a specific gravity of 1.1 and a volatile content of 7.0% were obtained.

Example 2 0 A laminated paperboard thicker than 2 layers consisting of 25 layers of kraft and linter mixed paper was dried at 14 mm for 1 hour, and polyamide resin was dissolved in a mixed solvent of methyl alcohol and ethyl alcohol. After coating 9 sheets of laminated cardboard to obtain composition 1 and drying at 80°C for 20 minutes, put 2 compositions in one press stage, heat and press at temperature 18p, pressure 20k9 for 90 minutes, and apply 38cm at the same pressure. Cool for a minute and adhere to a thickness of 17.6 skin (approx. 1.95 side cardboard) specific gravity of 1.2
A material for paper carton die-boats with a military content of 2.0% was obtained.

The paper carton die boat material obtained in this way was N
A die board for punching was created by processing with a drill equipped with C control. This die board punching blade was embedded and a rubber spring was attached to it, and the paper with a thickness of 1.5 mm was treated with a waterproof resin for liquid packs. As shown in Table 1, compared to the china veneer plywood conventionally used as a punching die, the bow-N according to the present invention has a much greater number of punching durability and a much greater number of times the punching blade can be replaced.

Table 1 Comparative example of punching out 1.5mm thick paper treated with waterproof resin for liquid packs 2 Approximately the same thickness, about 1mm
．． 82 side 8 pieces of Chinese veneer, 4 pieces each, on both ends about 1. A paper carton-type die boat made of Chinese veneer plywood was obtained by arranging the full-rib lauan veneers orthogonally in the center and using urea adhesive in a conventional manner.

Example 3 100 parts of epoxy resin Ep-1001 and 15 parts of diaminodiphenylmethane were mixed with two rolls, crushed with an atomizer mill, divided into 50 mesh or more finely divided pieces, and added to water while making softwood pulp. Thirty-five sheets of laminated cardboard, thicker than 045 and consisting of 8 layers, were used, with a paper weight of 18% based on the dispersed pulp content.

This material was configured as shown in Figure 3, and a mixture of 100 parts of epoxy resin Ep-828 and 8 parts of triethylenetetramine was applied to the surface and mottled surface of this 5-thick paper, and between each configuration at room temperature. Put Shigeru katagami paper in it and pressurize it for 24 hours using the block lamination method, and the thickness is 18.2 ribs (approx. 0.51 rib cardboard).
An O-type die boat punched from a paper carton with a specific gravity of 1.3 and 6.0% was obtained. Example 4 2 consisting of 18 layers made of kraft paper.

Inorganic filler-5 on each adhesive surface of 8 sheets of laminated cardboard thicker than 5 ribs
After applying polyvinyl alcohol with a degree of polymerization of 1,800 to which 1,800% was added, vinyl acetate and acrylic acid copolymer resin was applied to the surface so as to have the composition shown in Figure 3, and after drying at 5 pi○ for 3 times, Cover the surface with an unstretched polypropylene film of 60 layers and heat for 30 minutes at a pressure of 20 kph/ground at 12 mm.
(1 side cardboard) A paper carton dieport material with a specific gravity of 1.2 and a volatile content of 4% was obtained.

The paper carton die board material obtained in this way was processed with a carbon dioxide laser and a router to create a die board for punching.

Embed this die board's cutting blade and use it for packaging cases.
．． Five fences of cardboard were punched out, and the number of times the punching service life and the number of times the punching blade could be replaced was investigated. As shown in Table 2, compared to the conventional punching die made of Chinese veneer plywood partially reinforced with lauan material, the board according to the present invention has a much greater punching life and the number of times the punching blade can be replaced. shows. Table 2 Results of punching out 2.5 sized cardboard for packaging Brief description of the drawings Figures 1 to 3 are all cross-sectional views illustrating the die board of the present invention.

Figure 1 Figure 2 Figure 3

Claims (1)

[Claims] 1. 3. Laminated cardboard having a thickness of 0.11 mm to 15 mm obtained by laminating two or more layers of paper pulp mats under heat and pressure.
A total of 150 sheets with a specific gravity of 0.000 and 150 sheets were pasted with room temperature or heat curing thermosetting resin or thermoplastic resin.
6 to 2.2, a die boat for paper carton punching with a thickness of 12 mm to 22 mm and a volatile content of 15% or less. 2. The die boat for punching paper cartons according to claim 1, wherein the laminated cardboard contains 1% to 30% by weight of synthetic resin.