JP3159651B2 - Laminated solid model modeling method and laminated solid model modeling base paper - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to the use of thin paper,
The present invention relates to a three-dimensional CAD data forming method for forming an integrated three-dimensional model at high speed and at low cost, and a base material for a three-dimensional solid model used in the forming method.

[0002]

2. Description of the Related Art Conventionally, there are two types of laminating three-dimensional model forming methods using paper. One of them is to apply an adhesive in accordance with a required cross-sectional shape of a three-dimensional model to be obtained on a back surface of a paper sheet of a specific size (for example, A3 size), and to send the adhesive to a three-dimensional model being formed. Further, by applying heat to the solid model being formed, the adhesive is melted and the sheet paper is attached to the solid model being formed, and the paper is cut by a cutter into a desired sectional shape of the target solid model. This is a method of forming a three-dimensional model by cutting into small pieces, and further finely cutting so that unnecessary portions other than the three-dimensional model are easily removed later.

[0003] Another one is to feed a roll paper having an adhesive adhered to the back surface onto a three-dimensional model being formed, and press the roll paper against the three-dimensional model being formed while applying heat. By melting the adhesive and attaching the roll paper to the three-dimensional model being formed, and moving the laser along the required cross-sectional shape of the three-dimensional model aimed at, the required cross-sectional shape while burning the roll paper This is a method of forming a three-dimensional model by cutting into small pieces, and further finely cutting so that unnecessary portions other than the three-dimensional model are easily removed later.

In any of the above-described molding methods, unnecessary parts and a three-dimensional model are separated after the molding. During the separation process, there is a problem that a thin portion of the three-dimensional model is easily broken. When the broken portion was observed, it was found that it did not peel between the paper and the adhesive, but peeled off on one sheet of paper. Further, when the three-dimensional model is used as a press die and molded, there is a problem that it is difficult to form the three-dimensional model into a required shape because the three-dimensional model is greatly deformed by the compressive force applied in the paper laminating direction at the time of press molding.

[0005]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems in the prior art, and particularly has a sufficient mechanical strength even in a thin portion, and
An object of the present invention is to provide a method of forming a three-dimensional solid model and a base paper for a three-dimensional solid model in which dimensional changes due to pressure are small.

[0006]

According to a first aspect of the present invention, there is provided a process of supplying a base paper having an adhesive adhered to at least one side of a base paper onto a three-dimensional model being formed, and converting the base paper into a three-dimensional model being formed. In a method of forming a three-dimensional model by repeating a step of pressing and pasting and a step of cutting the base paper into a required cross-sectional shape of a three-dimensional model to obtain the base paper, the base paper is JIS
Paper delamination strength by P8139 is 100 to 150 g /
A method of forming a three-dimensional solid model, wherein the base paper is JIS P81.
Paper delamination strength according to No. 39 is 100 to 150 g / 15 mm
And the density according to JIS P8118 is 1.0 g / cm
^{2. The} method according to claim 1, wherein the number is ³ or more. Further, the invention according to claim 3 is a molding method base paper for forming a three-dimensional model by repeatedly cutting into a cross-sectional shape of a three-dimensional model to be obtained every time the base paper is laminated and bonded, wherein the base paper is delaminated according to JIS P8139. A laminated base paper for a three-dimensional model, the strength of which is 100 to 150 g / 15 mm.
In the invention of the present invention, the base paper has a paper delamination strength of 100 to 150 g / 15 mm according to JIS P8139, and JI
4. The laminated three-dimensional model base paper according to claim ^{3, wherein the} density according to SP8118 is 1.0 g / cm ³ or more.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION The laminated three-dimensional model forming base paper of the present invention has a configuration in which an adhesive is adhered to at least one surface of a base paper. The base paper used in the present invention is mainly composed of bleached wood pulp, other natural fibers, regenerated fibers, synthetic fibers, preferably hardwood bleached kraft pulp and softwood bleached kraft pulp as raw materials, fourdrinier paper machine, round mesh papermaking. It is manufactured by making paper with a machine. Other compounding agents include sizing agents, fillers,
Additives such as retention aids and dyes are added as needed.

In the present invention, the paper delamination strength is 100 g.
If it is less than / 15 mm, a problem arises in that the three-dimensional model after the formation of the three-dimensional model is broken in a step of separating the unnecessary part from the three-dimensional model. When the density is less than 1.0 g / cm ³ ,
When pressure is applied in the stacking direction of the three-dimensional model, there is a problem that a dimensional change occurs. In the present invention, the reason for defining the upper limit of the paper delamination strength is that the paper delamination strength is 1
If it is larger than 50 g / 15 mm, cracks may occur after the formation of the three-dimensional model, which is not preferable.

Here, the JIS P of the base paper in the present invention is used.
Paper delamination strength according to 8139: 100 to 150 g / 15
mm, and a density of 1.0 g / cm according to JIS P8118.
^In order to obtain ^three or more characteristics, there are the following two methods 1) and 2). 1) A method in which pulp is beaten strongly and densified by a calendar. 2) A method in which the density is increased by a calender using an internal paper strength agent. Of course, both of these methods can be used in combination.

Hereinafter, the above method will be described in detail. 1) A method in which pulp is beaten strongly and densified by a calendar. In preparing pulp, Canadian Freeness (J
Beat it to 150 ml or less with ISP8121). In this case, 50 to 150 ml is particularly preferable in consideration of dimensional stability and cost performance due to moisture absorption and desorption of the base paper. As raw materials other than pulp, chemicals such as a sizing agent, a paper strength agent, a filler, and a dye are added as necessary. The paper obtained is then further calendered. In this case, it is necessary to carry out calendaring with a machine calendar or a super calendar.

2) Method of densifying with a calender using an internal paper strength agent: 1 according to Canadian Freeness (JIS P8121)
The main raw material is pulp that has been beaten to more than 50 ml.
0.3 to 100 parts by weight of pulp raw material
It is preferable to add 5.0 parts by weight, and particularly preferably from 0.3 to 3.0 parts by weight in terms of workability and cost in the papermaking process. That is, if the paper strength enhancer is added in less than 0.3 part by weight, the effect of paper strength enhancement is insufficient, while if it is added in excess of 5.0 parts by weight, stains are generated in the paper machine, It is not preferable because it causes a problem that a trouble occurs as a foreign matter in the base paper. In this case, the paper strength enhancer is preferably one that imparts fiber bonding strength, and examples thereof include polyacrylamide, CMC, polyvinyl alcohol, starch, melamine-formaldehyde resin, urea-formaldehyde resin, and epoxidized polyamide resin. If necessary, agents such as a sizing agent, a filler and a dye may be added.

In both of the above steps 1) and 2),
Further, during the paper making process, a size press, a gate roll coater, a bar coater, a roll coater, an air knife coater, a blade coater, and the like are used, and in addition to polyvinyl alcohol as a water-soluble polymer, coating of starch oxide, CMC, MC, etc. Drying treatment may be used in combination.
The coating and drying treatment imparts surface strength to the base paper,
It can be expected to have the effect of preventing This is dried under normal conditions. The paper obtained is then further calendered.
In this case, it is necessary to carry out calendering with a machine calender or super calender by high linear pressure.

Next, an adhesive layer is applied to at least one side of the base paper obtained as described above to prepare a base paper. Examples of the application method include coating using a coater, laminating using an extruder, and laminating a sheet-like adhesive made of an adhesive material by a laminating method. Here, as the coater, a bar coater, a roll coater, an air knife coater, a gravure coater, a spray coater or the like is appropriately used. As the adhesive, conventionally known materials can be used, and ethylene-vinyl acetate copolymers, ethylene-
Acrylic ester copolymers, polyurethanes, polyethylenes, polyacryls, polyamides, polyesters and the like can be mentioned. Among them, those having a hot melt property are preferably used because the adhesive strength between base paper layers is improved, and examples thereof include ethylene-vinyl acetate copolymer, ethylene-acrylate copolymer and polyethylene-based copolymer. Is particularly preferred. The form of these adhesives is not particularly limited, but an aqueous emulsion is preferably used from the viewpoint of seepage into the base paper during coating, workability, nonflammability, and the like. Here, the coating amount of the adhesive layer is preferably 5 to 50 g / m ² , particularly 10 to 20 g.
/ M ² is preferred. If the coating amount is less than 5 g / m ² , sufficient adhesive strength cannot be obtained, and even if an adhesive layer having a coating amount exceeding 50 g / m ² is provided, the performance corresponding to the coating amount cannot be obtained, resulting in high cost. It made because we preferred name.

When a laminated three-dimensional model is manufactured using the laminated three-dimensional model base paper of the present invention thus obtained, the base paper has a sufficient strength so that it is difficult to bend at a thin portion. Also, good dimensional stability can be imparted to the model.

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in more detail with reference to embodiments. In addition, the term “parts in each example” means parts by weight unless otherwise specified.

Example 1 In a pulp slurry beaten to 100 ml of Canadian freeness consisting of 50 parts of NBKP and 50 parts of LBKP, a rosin sizing agent (brand name: Arakawa Kogyo Co., Ltd.) E) 0.4
And 2.0 parts of a sulfuric acid band, and after fixing, paper is made with a Fourdrinier paper machine and polyvinyl alcohol (trade name: Gohsenol N-
300) was applied so that the coating amount was 1.2 g / m ² to obtain a base paper having a basis weight of 100 g / m ² .

The base paper was super-calendered using a multi-stage calender comprising a metal roll and an elastic roll. Thereby, the paper delamination strength is 105 g.
/ 15 mm and a density of 1.20 g / cm ³ were obtained. On one side of this base paper, a hot-melt type adhesive of polyethylene resin (trade name: Chemipearl 100, manufactured by Mitsui Petrochemical Co., Ltd.) was applied by a bar coater so as to have an application amount of 17.0 g / m ² , A laminated paper for a three-dimensional model of the present invention was obtained.

Example 2 In a pulp slurry beaten to 300 ml of Canadian freeness consisting of 20 parts of NBKP and 80 parts of LBKP, a polyacrylamide paper strength agent (manufactured by Nippon PMC Co., Ltd.) was used as a paper strength enhancer for absolutely dry pulp. Product name: DS-
412) 2.0 parts, a rosin sizing agent (trade name: Size Pine E, manufactured by Arakawa Industry Co., Ltd.) as a sizing agent, 0.2 part, and a sulfuric acid band, 2.0 parts, were added and fixed. The paper is made, coated with a 4% solution of oxidized starch (product name: SK-20, manufactured by Nippon Cornstarch Co., Ltd.) in a size press so that the coating amount becomes 1.0 g / m ^2, and four-stage by a metal roll After calendering with a machine calendar, basis weight 110 g / m ² , paper delamination strength 130 g / 1
A base paper having a thickness of 5 mm and a density of 1.02 g / cm ³ was obtained. An adhesive layer was provided thereon in the same manner as in Example 1 to obtain a base paper for a laminated three-dimensional model of the present invention.

Example 3 A base paper was prepared in the same manner as in Example 1 except that 2.0 parts of a polyacrylamide paper strength agent (trade name: DS-412, manufactured by PMC Japan) was further added as a paper strength enhancer. Manufactured. The obtained base paper has a paper delamination strength of 145 g / 15 m.
m, and the density was 1.22 g / cm ³ . In addition, Example 1
In the same manner as in the above, an adhesive layer was provided to obtain a base paper for a layered model three-dimensional model of the present invention.

Example 4 A base paper was produced in the same manner as in Example 2 except that a multi-stage (16-stage) calender composed of a metal roll and an elastic roll was used as a calendering method, and that super-calendering was performed. The obtained base paper has a paper delamination strength of 130 g.
/ 15 mm and a density of 1.08 g / cm ³ . An adhesive layer was provided thereon in the same manner as in Example 1 to obtain a base paper for a laminated three-dimensional model of the present invention.

Comparative Example 1 A base paper was obtained in exactly the same manner as in Example 1 except that the pulp was beaten to 300 ml of Canadian freeness. The obtained base paper had a paper delamination strength of 80 g / 15 mm and a density of 1.
It was 10 g / cm ³ . An adhesive layer was provided thereon in the same manner as in Example 1 to obtain a comparative laminated three-dimensional model base paper.

Comparative Example 2 A base paper was obtained in the same manner as in Example 2 except that the addition of the paper strength enhancer was omitted. The obtained base paper has a paper delamination strength of 75 g.
/ 15 mm and a density of 1.02 g / cm ³ . An adhesive layer was provided thereon in the same manner as in Example 1 to obtain a laminated base model paper for comparison.

Comparative Example 3 A base paper was obtained in exactly the same manner as in Example 1 except that supercalendering with a multistage calender roll was omitted. The obtained base paper has a paper delamination strength of 105 g / 15 m.
m, and the density was 0.72 g / cm ³ . An adhesive layer was provided thereon in the same manner as in Example 1 to obtain a laminated base model paper for comparison.

Comparative Example 4 Example 2 except that the four-stage machine calendering was omitted.
A base paper was obtained in exactly the same manner as described above. The obtained base paper had a paper peel strength of 130 g / 15 mm and a density of 0.75 g / cm ³ . An adhesive layer was provided thereon in the same manner as in Example 1 to obtain a laminated base model paper for comparison.

Comparative Example 5 A commercially available base material for a laminated three-dimensional model, product name: LPH (manufactured by Helis) is used as a sample for comparison. The paper has a paper delamination strength of 84 g / 15 mm and a density of 0.90 g / cm ^3.
It is.

A high-speed three-dimensional printing system using such a base paper will be described. The high-speed three-dimensional printing system is based on laminating and bonding sheet members such as paper, and further, based on the cross-sectional shape of three-dimensional CAD data. Then, a three-dimensional model is manufactured by cutting a sheet member such as paper and repeating this. FIG. 5 to FIG. 8 show a molding process by a high-speed three-dimensional molding system. Hereinafter, the method of the present invention will be described with reference to these drawings. In the drawings, the same reference numerals indicate the same parts. Reference numeral 10 denotes a laminate being formed, which is placed on a table 11. The table 11 is moved up and down via a belt 13, a ball screw 14, and a nut 15 by driving a table lifting motor 12. Reference numeral 16 denotes a roll of paper, which is provided with an adhesive layer 3 on its back surface in advance, and is moved on the laminate 10 by sheet feed motors 17, 18 and a sheet winding motor 19. Reference numeral 20 denotes a heat-compression roller, and reference numeral 21 denotes a limit switch that detects the height of the laminated body 10. Both are configured to be movable in the left-right direction on the laminated body 10 by a motor 22 via ball screws 23 and nuts 24. . Reference numeral 25 denotes a laser irradiation head, which is configured to be movable left and right by a motor 26 via a ball screw 27 and a nut 28. Then, by irradiating a laser beam 29 from a laser oscillator (not shown) to the upper surface of the laminate 10,
The uppermost roll paper 16 of the laminate 10 can be cut into an arbitrary shape.

The molding of the laminate 10 by the above-described high-speed three-dimensional molding system is performed by repeating the steps shown in FIGS. First, as shown in FIG. 5, the roll paper 16 is moved onto the laminate 10 by the sheet feed motors 17 and 18 and the sheet winding motor 19. Subsequently, as shown in FIG. 6, the table 11 is raised by the motor 12 until the limit switch 21 is turned on.
When the table 11 has been raised to a predetermined height, as shown in FIG. 7, the heating / compressing roller 20 is moved by the motor 22 to adhere the roll paper 16 to the laminate 10. Then, as shown in FIG. 8, the laser irradiation head 25 is moved to cut the uppermost roll paper 16 of the laminated body 10 into a cross-sectional shape of a three-dimensional model to be formed. When the above steps are repeated and the lamination is completed for all the cross-sectional shapes, the unnecessary part cut by the laser beam is removed, and the modeling of the three-dimensional model 10 is completed. According to this high-speed three-dimensional modeling system, it is possible to produce a three-dimensional model in a much shorter time and at lower cost than conventional wooden dies and dies.

The base papers for laminated three-dimensional models obtained in Examples 1 to 4 and Comparative Examples 1 to 5 were laminated and laser-processed by a high-speed three-dimensional printing system (trade name: LOM1015, manufactured by Helisys), and shown in FIG. A bending test piece and a compression test piece shown in FIG. 2 were prepared.

FIG. 1 shows that one sheet of base paper 1 cut to a size of 8 mm × 10 mm is sequentially laminated on the next base paper 1 ′ and 1 ″... Via an adhesive layer 2 and laminated to a paper thickness of 150 mm. FIG. 2 shows a sheet of base paper 1 cut to a size of 20 mm × 20 mm, which is sequentially laminated on the next base papers 1 ′ and 1 ″ through an adhesive layer 2 and has a paper thickness of 60 mm. Shows a state where the layers are stacked.

Next, the bending strength and the dimensional stability of the obtained test pieces were measured by the following test methods. Test method Bending strength: Universal testing machine (Orientec company name:
Using UCT-500), a load 3 was applied from the cross-sectional direction by the method shown in FIG. 3, and the force when the test piece 4 placed at the interval (80 mm) between the fulcrums 5 was broken was measured. Was defined as the bending strength. Dimensional stability: Using a universal testing machine (trade name: UCT-500, manufactured by Orientec), the deformation amount of the test piece 4 when a load 3 of 5000 N is applied from the laminating direction by the method shown in FIG. Was measured. In FIG. 2, the dimension before compression from the vertical direction is X, and the dimension after compression is Y. From this, the dimensional stability was converted to the deformation rate by the following equation. Dimensional stability (deformation rate) = [(X−Y) / X] × 100
(%) Table 1 shows the test results.

[0031]

[Table 1]

According to the evaluation results shown in Table 1, the three-dimensional model (test piece) formed using the laminated three-dimensional model forming base paper according to Examples 1 to 4 has sufficient bending strength for practical use. Mechanical strength was obtained. That is, when removing unnecessary portions from a lump of paper formed using the above-mentioned stacked type three-dimensional model forming base paper, there is no need to worry about the thin portion of the three-dimensional model being broken.
Even with a thin three-dimensional model such as a fin, it was possible to obtain strength enough to be attached to a motor and rotated. Further, according to the test results in Table 1, the three-dimensional models (test pieces) formed using the laminated three-dimensional model forming base papers of Examples 1 to 4 obtained mechanical strength sufficient for practical use in terms of compressive strength. That is, when a three-dimensional model formed using the above-mentioned laminated type three-dimensional model forming base paper is used as a press die, the deformation of the press die during press molding is smaller than before, so that it can be used as a prototype press die. Became.

[0033]

The three-dimensional model formed using the base paper for a laminated three-dimensional model of the present invention has a paper delamination strength of 100 g / paper.
By making it 15mm or more, the bending strength is 0.4kgf
/ Mm ² or more, and when removing the insoluble portion from the lump of paper formed by the modeling machine, there is no possibility that the thin portion of the three-dimensional model is broken. Further, a thin three-dimensional model such as a fin can be attached to the motor and rotated. Furthermore, the three-dimensional model formed using the laminated three-dimensional model base paper of the present invention has a deformation rate of less than 4% by setting the density of the paper to 1.0 g / cm ³ or more. It could be used to press form into the desired shape.

[Brief description of the drawings]

FIG. 1 is a perspective view of a bending test piece.

FIG. 2 is a perspective view of a compression test piece.

FIG. 3 is an explanatory view of a bending strength test method.

FIG. 4 is an explanatory view of a dimensional stability test method.

FIG. 5 is an illustration of the method of the present invention.

FIG. 6 is an illustration of the method of the present invention.

FIG. 7 is an explanatory diagram of the method of the present invention.

FIG. 8 is an illustration of the method of the present invention.

[Explanation of symbols]

 1, 1 ', 1 "Base paper 2 Adhesive layer 3 Load 4 Test piece 10 Laminate being formed 11 Table 12 Table lifting motor 13 Belt 14 Ball screw 15 Nut 16 Roll paper 17 Sheet feed motor 18 Sheet feed motor 19 Sheet winding motor 20 Heating / compression bonding motor 21 Limit switch 22 Motor 23 Ball screw 24 Nut 25 Laser irradiation head 26 Motor 27 Ball screw 28 Nut

Continuation of front page (72) Inventor Toru Nonoyama 1-1-1 Asahi-cho, Kariya-shi, Aichi Prefecture Inside Toyota Koki Co., Ltd. (56) References JP-A-7-195533 (JP, A) JP-A-6-118875 ( JP, A) JP-A-4-262322 (JP, A) JP-A-50-85636 (JP, A) JP-A-2-97935 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , (DB name) B31B 5/00 D21H 27/00

Claims (4)

(57) [Claims] And 1. A step of supplying a base paper having adhered on at least one side to the adhesives of the base paper on a three-dimensional model in the modeling, a step of pasting against the three-dimensional model in shaping the base paper, the base paper In the method of forming a three-dimensional model by repeating the step of cutting the required cross-sectional shape of the three-dimensional model to be obtained, and forming a three-dimensional model,
The method according to claim 1, wherein the base paper has a paper interlayer peeling strength of 100 to 150 g / 15 mm according to JIS P8139. 2. The base paper has a paper delamination strength of 100 to 150 g / 15 mm according to JIS P8139, and has a JI
Stack type three-dimensional model molding method according to claim 1, wherein the density by S P8118 is 1.0 g / cm ³ or more. 3. A forming method base paper for forming a three-dimensional model by repeatedly cutting into a cross-sectional shape of a three-dimensional model to be obtained every time the base paper is laminated and bonded.
Paper delamination strength by P8139 is 100-150 g /
A laminated base paper for forming a three-dimensional model, which is 15 mm. 4. The base paper has a paper interlayer peel strength of 100 to 150 g / 15 mm according to JIS P8139 and a density of 1.0 g / cm ³ according to JIS P8118.
The base paper for forming a three-dimensional model according to claim 3, characterized in that: