JP2902594B2 - Method of manufacturing formwork for making three-dimensional paperboard - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a papermaking mold for a three-dimensional paper container.
It relates to a process for the production of the frame, in particular a method for manufacturing a mold for papermaking lampshades (illuminator for shade) like in sterically once paper material such as paper mulberry as a material.

[0002]

2. Description of the Related Art In general, Japanese paper lamp shades have long been used to wind Japanese paper around candles and candlesticks or to use dark lamps to reflect the light of candles. Lighting equipment has since been replaced by electric lights with the development of civilization, and shades have been provided in a wide variety of chemical materials such as plastics. However, in the recent high-tech and stressed societies, the unique texture of Japanese paper has been reviewed,
Demand for light shades made of Japanese paper is increasing.

[0003] However, there are many limitations in producing a lamp shade with Japanese paper. Japanese paper is hand-processed as a thin, rectangular, flat cloth, which is cut into pieces of paper as appropriate and glued to a desired frame such as a dark lamp using glue. You. Therefore, Japanese paper can only take advantage of the goodness of its material if it has a framework, and it was not possible to create a lampshade by itself without the framework.

Accordingly, the applicant of the present application has provided a method in which a three-dimensional paper container can be formed at one time by forming a paper using a mold (Japanese Patent Laid-Open No. 60-58329). The present invention suspends a mold having a desired three-dimensional shape made of a mesh wire mesh in a container so as to be able to float and sink, and after stirring the raw material pulp liquid to fill the container and uniformly distribute the stock, The mold is suspended in the raw material pulp solution, the paper material is adhered to the inner peripheral surface thereof, and the mold is taken out of the container and dried in the drying chamber to obtain a paper container having a desired three-dimensional shape. It was that.

However, it is difficult to attach the stock uniformly by moving the mold up and down, and it is necessary to devise a mechanism for moving the mold up and down. However, it could not exceed the range of craftsmanship, and could not be provided at a low cost with mass productivity.

Therefore, the present applicant has further provided an improved method of this papermaking method (Japanese Patent Application Laid-Open No. 62-21900). In this improved invention, a mesh-shaped mold having a desired three-dimensional shape is fixedly arranged in a predetermined container, and the raw material pulp liquid is placed in the container and dispersed in water. Drain water from the inner surface of the mold while stirring to generate a water flow, apply the stock to the outer surface of the mold, remove the mold from the container, dry it, shape it, and then mold after drying The mold was released from the mold.

[0007]

The conventional three-dimensional papermaking mold disclosed in the above-mentioned application has used a stainless steel wire netting which is easy to mold. Wire mesh is a familiar material having a filter function, and at the same time, has a wide selection of materials, mesh standards, etc., as industrial materials for papermaking. The use of such a wire mesh has the advantage that general papermaking data can be referred to when working on three-dimensional papermaking in an unknown area. Moreover,
The wire mesh was relatively easily formed at the handmade level. However, the wire mesh itself has been the largest factor in creating the limitations of the mold.

[0008] That is, the first factor is that the cost is high when a molding die is press-formed using a stainless steel wire mesh as a material. Since press molding requires an expensive press mold, it is inevitably reflected in the cost of a three-dimensional papermaking mold.

The second factor is that it is not possible to achieve high-level mass production with a hand-drawn mold. Uniformity cannot be ensured if a mold is formed by hand drawing processing in favor of expensive press molding. Therefore, uniformity of a paper product cannot be ensured, and it is not possible to leave a craft area in one-piece production.

[0010] The third factor is that the mold for forming a wire mesh deteriorates remarkably with the frequency of use, and the quality of a paper product cannot be guaranteed. Since three-dimensional papermaking uses 1 ton or more of water (raw material pulp liquid) per process, the structure must have a sufficient pressure resistance. For the pressure-resistant structure, it would be good if the wire mesh is framed, but other than the parts supported by the frame are depressed by water pressure, and inconveniences such as increased weight occur. It will not be possible to realize the desired design by omitting it. That is, by repeated use, tension of the mesh wire mesh portion located between the frames is lost, the mold is deteriorated, and the shape of the paper container to be formed is slightly distorted.

The fourth factor is that a hand-drawn mold cannot reflect the technical potential of today's industry. That is, today's industry cannot execute any production plan without a computer. Especially in the machine tool industry such as molding dies, the evaluation is influenced by the design of incorporating automatic machine tools including NC machining, and the hand-drawing dies are very outdated, The number of skilled hand drawing craftsmen is decreasing.

As described above, the use of a wire mesh formwork with a mesh wire mesh has brought about a problem. However, forming a perforated material such as punched metal into a three-dimensional shape, or forming a metal plate into a three-dimensional shape and forming regular through holes in the three-dimensional shape is extremely expensive. It is undoubtedly the current situation.

In view of the above circumstances, the present invention is directed to a three-dimensional paper carton capable of achieving standardization and mass production of three-dimensional papermaking at a low cost and realizing fine design details. and to provide a method for producing a sheet-forming mold.

[0014]

In order to solve the above-mentioned problems, the present invention creates a solid model of a three-dimensional paper container to be made.
The solid model is covered with a resin plate of a predetermined area that can be covered.
A large number of through-holes are drilled in the required work area
And superimpose a highly extensible sheet covering the entire work.
And heat the work and sheet to improve their extensibility.
The solid model and the two in a vacuum
After pressing and shaping, the work and sheet are cooled and cooled.
Forming form for three-dimensional paper box that peels off sheet from work after rejection
Is provided as a basis. Then, the through hole is formed by a laser processing machine based on Cad data, the resin plate is an acrylic plate, and the diameter of the through hole is about 1 mm.
The present invention provides a means in which the through holes are arranged in a staggered manner with a core interval of about 1.5 mm and the resin plate is an acrylic plate having a thickness of about 3 mm .

[0015] It before Symbol solid model having a shaped portion to be papermaking stereoscopic paper container, and a base portion for setting the vacuum forming machine integral with the molding section, the area wherein the sheet is larger than the workpiece The solid model moves toward the work and the sheet in vacuum at the stage where the extensibility of the work and the sheet is improved by heating, and cooling of the work and the sheet after shaping Provides a means for sequentially performing air cooling and then water cooling.

Therefore, the resin plate is innumerably drilled with a laser beam machine using Cad data by a computer, heated, and vacuum-molded by a vacuum molding machine using a solid model, thereby forming a papermaking mold. Can be created indefinitely, mass production is possible with the use of multiple molds, and standardization is possible.

[0017]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to the drawings. As shown in FIG. 1, a papermaking mold frame 1 according to the present invention is a resin mold such as an acrylic plate comprising a molded portion 2 and a base portion 3 supporting the molded portion 2. The molded portion 2 has a semicircular spherical surface, but this is merely an example, and other shapes can be adopted. That is, it has a form of a forming part 2 corresponding to a three-dimensional form of a paper container such as a lamp shade to be formed using the papermaking mold 1.

A large number of through-holes 4 are regularly formed in the entire surface of the papermaking mold 1 comprising the molding part 2 and the base part 3. The base part 3 is for mounting and fixing on an appropriate support when fixing and supporting the container containing the raw material pulp, and is integrated with the molding part 2. The papermaking mold 1 is formed by heating and vacuum forming an acrylic plate.

Therefore, the molded portion 2 corresponds to a conventional wire mesh form, and the through holes 4 replace the mesh of the conventional wire mesh. Before the three-dimensional molding, the diameter of the through hole 4 is about 1
mm, the core interval is about 1.5 mm, and a zigzag arrangement is perforated with an acrylic plate having a thickness of 3 mm by a laser processing machine.

Therefore, a method for manufacturing the papermaking mold 1 will be described. This method is divided into a preparatory stage and a vacuum forming stage.

As a first step in the preparatory stage, a lamp shade design is determined and its three-dimensional shape is created.
As shown in FIG. 2, this three-dimensional shape is a solid model known as a so-called wooden shape or the like. The solid model 5 has a mold part 6 for molding the molding part 2 and a mold part 7 for molding the base part 3.

As a second step, the computer is operated on the computer through the through holes 4.
The Cad data of the shape (circle), the center interval, and the arrangement (staggered) are created over an arbitrary area. In the embodiment, as shown in FIG. 4, the diameter of the through hole 4 is about 1 mm, and the core interval P is about 1.5 m.
m, the staggered arrangement in which the angle between the cores is 60 degrees. FIGS. 5 and 6 show examples of other shapes of the through holes 4. In FIG. 5, square 1 through 1 mm sides are arranged in a lattice with a spacing W between the through holes 0.5 of 0.5 mm. FIG. 6 shows a hexagonal through-hole 4 inscribed in a diameter of 1 mm, which is arranged in a zigzag pattern with an interval W between the through-holes of 0.5 mm. According to these arrangements and shapes, water marks (hole marks) remaining on the product after paper making due to the water flow (raw pulp liquid) during paper making.
Can be visually perceived as plain. The size of the through-hole is suitably smaller than the size to be obtained on the Cad data in consideration of a margin (drilling) at the time of drilling work by a laser processing machine described later. For example, a diameter of 1 mm shown in the embodiment
In order to drill a hole of Cad data, the diameter of 0.7
For example, it may be about 5 mm. The specific allowance (killing) at the time of the drilling operation may be determined according to the shape and arrangement of the through-hole to be obtained. Room (Kirishiro)
It is necessary to consider.

On the contrary, it is also possible to incorporate a watermark into a product as a design pattern. In this case, the intended watermark can be made to appear by increasing the size of the through hole 4, changing the shape, or changing the arrangement shape.

In a third step, an acrylic plate (thickness: 3 mm) formed by an appropriate means such as extrusion molding or casting molding is cut into a desired shape in a predetermined area such as a square in order to form a desired mold. Create a work.

As a fourth step, a PVC sheet as a sheet covering the whole work is cut into a size larger than the size of the work in order to close the through holes 4.

In the fifth step, the work is set on the processing surface of the laser beam machine, and the data created in the first step is output. As shown in FIG. 3, the work 8 is formed of a predetermined rectangular acrylic plate. Through holes 4 are uniformly formed in a required area of the entire surface of the work 8 in a circle having a predetermined radius r serving as the forming portion 2 and other portions serving as the base portion 3. Many through holes 4 are formed in a staggered arrangement. This ends the preparatory stage. In addition, the through hole 4 may be formed only in a circle having a predetermined radius r serving as the molded portion 2. In addition, in order to form the through hole 4, not only a laser machine but also any machine capable of forming the through hole may be used, such as a drill machine or an NC machine. Processing machine can be used.

Next, the process proceeds to the vacuum forming stage.
The vacuum forming machine used at this stage is as shown in FIG.
The solid model 5 is set on a plate 13 supported by a piston rod 14 which can be moved up and down, and a work 8 is fixed together with a PVC sheet 9 on a guide 12 on which the plate 13 is moved up and down with a fastener 11, and the work is supplied by hot air or the like. A known device having heating means 8 and capable of moving the solid model 5 toward the heated work 8 and, at that time, maintaining the space between the solid model 5 and the work 8 in a vacuum. is there.

Therefore, as a first step in the vacuum forming step, the solid model 5 is set in a vacuum forming machine, and a release agent is applied to the surface thereof.

In the second step, a release agent is applied to the contact surfaces of the workpiece 8 and the PVC sheet 9 so as to overlap each other.

As a third step, as shown in FIG. 8, the work and the PVC sheet are overlapped with a mold release agent therebetween, and heated (about 250 ° C.) until it is easy to mold. Make sure the bisheet stretches enough.

As a fourth step, a solid model is pressed in a vacuum on a work and a PVC sheet, which have been confirmed to have elongation performance by heating. Note that “in vacuum” does not necessarily mean that a closed space that can be evacuated is required, and it is sufficient to generate a negative pressure between the solid model and the work, if necessary. Therefore, a blower for sucking and discharging air between the solid model and the work may be provided.

As a fifth step, as shown in FIG. 9, the formed work and the PVC sheet are cooled by first spraying cooling air with an air cooling nozzle 15 and then cooling water with a water cooling nozzle 16. Fix the shape. This is to perform permanent shaping on the heated work 8 and the PVC sheet 9.

In the sixth step, the shaped work and the PVC sheet are removed from the vacuum forming machine, and the PVC sheet 9 is peeled off from the work 8 as shown in FIG. This PVC sheet 9
Is intended to facilitate the vacuum forming of the work 8 by closing the through hole 4 formed in the work 8.

In the seventh step, the work is subjected to processing such as attaching parts necessary for papermaking, thereby completing a mold. This is because, as shown in FIG. 1, a hole is formed in the base portion 3 by passing a screw, and the base portion 3 is set in a container containing the raw material pulp.

Thus, if one solid model is formed, the shape can be reproduced indefinitely by repeating the above-described steps as a papermaking mold, so that a papermaking mold can be obtained at low cost and a large number of paperwork can be obtained at once. If a papermaking machine is made using a papermaking mold, standardized papermaking machines can be mass-produced outside the artistic area, and the cost of the papermaking machine can be reduced.

FIG. 11 shows that the above-described papermaking mold 1 according to the present invention is fixedly arranged in a predetermined container, the raw pulp liquid is put in the container and dispersed in water, and then the raw pulp liquid is appropriately stirred. A perspective view showing a state in which the papermaking mold 1 is removed after drainage is performed from the inner surface side of the papermaking mold 1 while generating a water flow to apply the stock 10 to the outer surface of the papermaking mold 1. FIG. 12 is a central sectional view of FIG. Then, FIG.
As shown in FIG. 3, the three-dimensional paper container 11 detached from the papermaking mold frame 1 is subjected to finishing using, for example, a lamp shade or the like. FIG. 14 is a front view showing a state in which a frame body is mounted around the lamp body as the lamp shade 12, and the lamp body is equipped with the lamp body.
FIG. 15 is a partial cross-sectional view of the lamp shade 12.

[0037]

As described above, according to the present invention,
A mass-production system for three-dimensional paperboard forming molds has been established, and molded molds can be manufactured at low cost and maintain the same uniformity, enabling mass production and standardization of paper products. . Above all, it can be formed into any form as a papermaking mold frame, and it is possible to form a mold into a form that is imagined as a three-dimensional paper container. Furthermore, it is made of acrylic resin, is easy to mold, and is lightweight and easy to handle even after completion as a mold. Also, the design on the computer can be directly reflected on the model. And, the obtained papermaking mold is less deteriorated as a mold, and even if mass-produced, the water flow and the water pressure disperse the raw materials, and the through-hole portion through which water passes is not deteriorated. It can be mass-produced accurately. In addition, the adhesion of the water-dispersed raw material fibers and the flow of water during papermaking are easy.

[Brief description of the drawings]

FIG. 1 is a perspective view of a papermaking mold according to the present invention.

FIG. 2 is a perspective view of a solid model.

FIG. 3 is a plan view of a work.

FIG. 4 is an explanatory view showing an arrangement state and a shape of a through hole.

FIG. 5 is an explanatory view showing an arrangement state and a shape of a through hole.

FIG. 6 is an explanatory view showing an arrangement state and a shape of a through hole.

FIG. 7 is a schematic configuration example of a vacuum forming machine.

FIG. 8 is an initial process diagram for covering a work with a sheet.

FIG. 9 is a view showing a cooling process after vacuum forming.

FIG. 10 is a final process diagram of peeling a sheet from a work.

FIG. 11 is a perspective view showing a papermaking mold with a paper material adhered thereto.

FIG. 12 is a central sectional view of FIG. 11;

FIG. 13 is a perspective view showing the three-dimensional paper container removed from the papermaking mold.

FIG. 14 is a front view showing a state where a lamp body is provided as a lamp shade.

FIG. 15 is a partial sectional view of FIG. 14;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Forming frame 2 ... Molding part 3 ... Base part 4 ... Through-hole 5 ... Solid model 8 ... Work 9 ... Sheet

Claims (9)

(57) [Claims] 1. A solid model of a three-dimensional paper container to be made is prepared, and a work made of a resin plate having a predetermined area capable of covering the solid model is provided with a large number of through-holes within a required area. After superimposing the extensible sheet to cover, heating the work and the sheet and pressing the both and the solid model in a vacuum at the stage where the extensibility of both is improved, then cooling the work and the sheet And
A method for manufacturing a three-dimensional papermaking papermaking formwork, comprising separating a sheet from a work after cooling. 2. The method according to claim 1, wherein the through holes are formed by a laser beam machine based on Cad data . 3. The method according to claim 1, wherein the resin plate is an acrylic plate . 4. The method for producing a three-dimensional paperboard forming form according to claim 1, wherein the diameter of the through-holes is about 1 mm, the center distance between the through-holes is about 1.5 mm, and the staggered arrangement . 5. The form for forming a three-dimensional paper container according to claim 1, wherein the resin plate is an acrylic plate having a thickness of about 3 mm.
Manufacturing method. 6. The solid model according to claim 1, 2, 3, 4 or 5, further comprising a shaped portion to be papermaking stereoscopic paper container, and a base portion for setting the vacuum forming machine integrally with the molded part A method for producing a three-dimensional papermaking formwork. 7. A sheet manufacturing method of the sheet-forming mold of the three-dimensional folding carton according to claim 2, 3, 4, 5 or 6, wherein Ru PVC sheet der having an area greater than the workpiece. In 8. heated in a vacuum at the stage having improved extensibility of the workpiece and the sheet, according to claim 1, 2, 3, 4 which solid model is moved towards the workpiece and the sheet
Or a method for producing a three-dimensional papermaking formwork according to 7 above. 9. The cooling of the workpiece and the sheet after the shaping is performed by air cooling first and then water cooling sequentially .
9. The method for producing a three-dimensional papermaking formwork according to 2, 3, 4, 5, 6, 7, or 8 .