JPH0892899A - Mold material for producing pulp mold - Google Patents

Abstract

PURPOSE: To obtain a mold material used for mold for production of pulp mold, capable of readily producing compared with a conventional mold, difficult to cause hinderance due to clogging of mold in forming a pulp mold and capable of forming pulp mold without requiring wire net. CONSTITUTION: A mold for pulp mold is formed using a mold material of a metal porous body having three-dimensional communicating pores. The distribution density of the three-dimensional communicated pores is preferably >=10 pores per inch. The mold material having three-dimensional communicating holes can be produced by applying slurry of metal or metal oxide to a skeleton of a porous expandable resin and baking it. The mold material can be produced also by applying metal plating to the skeleton of the porous expandable resin and baking it. The metal material can be made of any one of copper, copper alloy, nickel, nickel alloy, iron and iron alloy.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mold material for producing a pulp mold which is used as a packing material for home electric appliances, a package for gift products, a packing material for fruits and vegetables, and more particularly to a mold material for forming a pulp mold. This is a proposal for a material for a die that can obtain a pulp mold having a predetermined thickness without clogging, good releasability, and the like.

[0002]

2. Description of the Related Art In recent years, a pulp mold formed by melting waste paper or pulp into a liquid state and molding it in a mold has attracted attention in place of the Styrofoam packaging material from an environmental point of view.
Pulp molds include soft molds and hard molds, and soft molds are finished by making raw materials into a mold of a predetermined shape and drying, as in the case of making paper.
The hard mold is obtained by pressing a high-concentration raw material with an uneven die.

Among the pulp molds, the method for producing soft molds is as follows. First, a raw material for newspapers, magazines, cardboards, etc. is dissociated and dispersed by adding water with a pulper to form a slurry, and then a raw material insufficiently dissociated with the pulper. After adjusting the raw material concentration, after removing the undissociated raw material, for example, the mold is submerged in the bat charged with the slurry-like raw material,
It is a method in which a raw material is sucked into the mold by a rotary molding machine in which a vacuum pump sucks and molds the material, and the material is molded into a predetermined shape and dried.

The mold used in this method is a block material such as aluminum or brass machined into a desired surface shape by a cutting machine such as an NC lathe. A plurality of fine holes penetrating the back surface.

When this mold is set in a molding machine, a wire mesh is further arranged on the front surface of the mold, and a raw material in which waste paper or pulp is melted is sucked to cause clogging of fine holes in the mold at the time of molding. The mold releasability after molding is improved.

In the hard mold, a male mold and a female mold each having a plurality of fine holes penetrating from the front surface to the rear surface are used, and a wire net is arranged like the soft mold, for example, a gap between both molds. The above raw material in the form of slurry is introduced into the above, the water content of the slurry is sucked through the pores, the raw material is attached to the surface of the wire mesh, and then pressed with a male die and a female die.

[0007]

However, in such a conventional mold for producing a pulp mold, a plurality of fine holes penetrating from the front surface to the back surface are provided by, for example, electric discharge machining or machining as described above. However, it is extremely difficult to form fine holes in the mold, and when the pulp slurry is sucked from the fine holes, the fine holes are easily clogged, and the pulp mold has an uneven thickness. If it becomes clogged, it may not be solved even if high-pressure air is blown. In addition, a wire mesh has to be used in addition to the mold, and there is a problem that the mounting work is complicated.

The object of the present invention is to provide a pulp mold which does not need to be provided with any fine holes in a mold used for forming a pulp mold, has no clogging, has good mold release properties, and has a constant thickness. It is in the process of obtaining a mold for pulp mold manufacturing.

[0009]

[Means and Actions for Solving the Problems] For the above-mentioned purpose, the present invention provides a raw material obtained by adding water to waste paper and dissociating and dispersing the waste paper into a slurry by using a molding machine equipped with a mold. A mold material used for a mold for pulp pulp molding, which is manufactured by molding into a predetermined shape by suction or suction press into a mold, releasing, and drying, and which has a three-dimensionally communicating hole. A mold material formed of a porous body is provided as a means for solving the problem.

The metal porous body having three-dimensionally communicating pores is (1) coated with a slurry of metal or metal oxide on the surface of the skeleton of porous foamed resin, and then dried, A metal porous body having three-dimensionally connected pores obtained by a so-called "slurry method", which is produced by baking at a temperature at which the foamed resin is thermally decomposed to eliminate the foamed resin, and then baked at a reducing atmosphere. Is preferred.

(2) The metal porous body having three-dimensionally communicating pores is obtained by applying metal plating to the surface of the skeleton of the porous foamed resin and then firing it at a temperature at which the foamed resin decomposes thermally. A metal porous body having three-dimensionally connected pores obtained by a so-called "plating method" in which the foamed resin is eliminated and then baked in a reducing atmosphere is preferable.

The metal porous body having three-dimensionally communicating holes is a metal porous body having three or more three-dimensionally communicating holes having 10 or more holes per inch, preferably 30 to 80 holes. Mold materials are preferred. Further, the porous metal body having the three-dimensionally communicating holes is preferably a mold material formed of any metal selected from copper, copper alloy, nickel, nickel alloy, iron and iron alloy.

[0013]

Since the die material according to the present invention is formed by the metal porous body having the three-dimensionally communicating holes, there is no need to provide any fine holes, there is no clogging, and the mold releasability is good and always constant. It has the effect that a thick pulp mold can be obtained. Further, this mold material has a large suction force, and even in the case of a soft mold, it is possible to obtain a pulp mold having a thickness thicker than the conventional one.

The mold material according to the present invention is a block or plate-shaped mold material, the surface of which is further cut by a cutting machine such as an NC lathe to form a predetermined shape,
Pulp mold mold.

Next, a detailed description will be given of the porous metal body (hereinafter referred to as a foam metal) having pores which are three-dimensionally communicated with each other in the present invention.

To obtain a foam metal by the slurry method,
Preferably, the average particle size is 1 to 15 μm and the minimum particle size is 0.1 μm.
m, a powder of the above metal or metal oxide having a maximum particle size of 30 μm, a liquid phenol resin preferably having a viscosity of 10 to 10,000 cp, a diluent and, if necessary, a thickener, and a viscosity of 500 to 2, A slurry liquid of 000 cp is formed, and a foamed resin such as a plate-shaped or block-shaped urethane foam is immersed in the slurry liquid, and the slurry liquid is applied to the skeleton of the foamed resin.

Next, the foamed resin is dried and fired to thermally decompose the foamed resin to disappear, and then further fired in a reducing atmosphere to sinter the coated metal powder or metal oxide powder. Are bonded to each other to produce a plate-shaped metal foam having a three-dimensional network structure.

To obtain a foam metal by a plating method, a foam resin such as urethane foam is impregnated with a solution containing graphite, and graphite is applied to the skeleton of the foam resin to impart conductivity to the urethane foam. To do. When electrolysis is performed by using this conductive urethane foam as a cathode and, for example, a Ni plate or block as an anode, the skeleton of the foamed resin can be plated with Ni.

As the electrolytic solution, a known nickel plating bath,
For example, a Watt bath, a sulfamic acid bath, or the like can be used. When the foamed resin plated with nickel is dried and fired, the foamed resin is thermally decomposed and disappears, and when this is further fired in a reducing atmosphere, a nickel porous body having a three-dimensional network structure is obtained. The conductivity can be imparted by subjecting urethane foam to electroless plating.

The firing is preferably performed in a reducing atmosphere such as a hydrogen atmosphere while blowing an appropriate amount of steam or carbon dioxide gas. On this occasion,
When using wet hydrogen having a dew point of 50 to 80 ° C, or 1
When a mixed gas consisting of 0 to 50 Vol% carbon dioxide gas and hydrogen is used, the thermally decomposed foamed resin is vaporized and does not remain as residual carbon, so that the carbon content of the foamed resin is low, and the foam has excellent strength and toughness. A metal is obtained.

In such a foam metal, a large number of holes inside the foam metal are three-dimensionally communicated with each other to form a flow path of extremely high density. Therefore, when molded as a mold for producing pulp mold, when sucking the slurry-like raw material,
The water and air sucked together with the slurry uniformly flow through the three-dimensionally communicating channels, and the raw material is sucked and adheres to the mold with a small passage resistance and a uniform thickness.

Further, even if the clogging occurs, the flow path avoiding the clogging portion is immediately formed, so that the operation obstacle due to the clogging does not occur and the high pressure air is blown. You can easily remove the clogging.

The density of the communication holes in the foam metal is
The number of holes per inch is 10 or more, preferably 30 to 8
It is preferable that the number is zero. The foam metal having the communicating holes having the density within this range can be easily manufactured by selecting the foam resin having the holes having the corresponding density.

According to the knowledge of the inventors of the present invention, when a foamed metal having three-dimensionally communicating holes with a density of 30 to 80 per inch is used, a normal used paper or pulp is melted without using a wire mesh. It is possible to directly attach the pulp slurry from the raw material to the surface of the mold.

The mold obtained by processing the mold material of the present invention is
After forming the pulp mold on the surface of the mold, for example, dry air is blown in the reverse direction from the back surface of the mold to the surface through the three-dimensional communication holes, so that the formed pulp mold can be easily formed. It can be peeled off and taken out.

[0026]

EXAMPLE FIG. 1 is a schematic explanatory view of a mold material of the present invention, and FIG. 2 is a partially enlarged schematic explanatory view of the mold material shown in FIG. The mold material 1 is made of nickel foam metal formed by a slurry method, and the inside thereof is, as shown in FIG.
It is composed of a nickel skeleton 1a having a three-dimensional network structure, and around the skeleton 1a of the mold material 1, about 50 three-dimensional innumerable holes 1b are formed per inch.

FIG. 3 is a perspective view showing an embodiment in which the mold material 1 is cut and manufactured as a mold of a pulp mold used as a cushioning material for packaging. The mold 2 is
The concave portion 2a and the convex portion 2b are provided, and the concave portion 2a and the convex portion 2 are provided.
The above-mentioned raw material (pulp slurry) is suction-adhered and deposited by a vacuum pump (not shown) on the surface of the mold 2 having b to form a pulp mold. Then, the formed pulp mold is easily peeled off by blowing air from the back surface of the mold 2.

[0028]

EFFECTS OF THE INVENTION Since the die material according to the present invention is formed of the metal porous body having the three-dimensionally communicating holes, there is no need to provide any fine holes, no clogging, and good releasability. Have an effect. Further, this mold material has a large suction force, and even in the case of a soft mold, it is possible to obtain a pulp mold having a thickness thicker than the conventional one.

[Brief description of drawings]

FIG. 1 is a schematic explanatory view of a mold material of the present invention.

FIG. 2 is a partially enlarged schematic explanatory view of a mold material of the present invention.

FIG. 3 is a schematic explanatory view of an example of a mold of the present invention.

Claims (5)

[Claims] 1. A method in which water is added to waste paper and the waste paper is dissociated and dispersed in a slurry form is sucked into the mold by a molding machine equipped with a mold to be molded into a predetermined shape, released, and dried. A mold material for manufacturing a pulp mold product, which is used for a mold for manufacturing a pulp mold, wherein the mold material is formed by a metal porous body having three-dimensionally communicating holes. Mold material for. 2. A porous metal body having pores communicating with each other in three dimensions, wherein a metal or metal oxide slurry is applied to the surface of a skeleton of a porous foamed resin and then dried, and the foamed resin is heated. 2. A pulp metal mold for producing a pulp mold according to claim 1, which is a metal porous body having three-dimensionally communicating pores, which is produced by firing at a temperature at which it decomposes to eliminate the foamed resin and then firing in a reducing atmosphere. Mold material. 3. The metal porous body having pores communicating with each other in three dimensions, metal plating is applied to the surface of a skeleton of a porous foamed resin, and the foamed resin is fired at a temperature at which the foamed resin is pyrolyzed. After disappearing, it is a porous metal body having three-dimensionally communicating pores produced by firing in a reducing atmosphere.
A mold material for producing a pulp mold according to claim 1. 4. The porous metal body having three-dimensionally communicating pores, wherein the number of pores per inch is 10 or more, and the porous metal body has three-dimensionally communicating pores.
Or the die material for pulp pulp manufacturing as described in 3. 5. A metal having a three-dimensionally communicating hole of any metal selected from copper, copper alloy, nickel, nickel alloy, iron and iron alloy, wherein the three-dimensionally communicating porous metal body has a three-dimensionally communicating hole. A porous body, claim 1, 2 or 3.
Alternatively, the mold material for producing the pulp mold according to item 4.