JPH09155869A - Apparatus for producing foamed resin molded object - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enhance heating efficiency by covering the periphery of a mold with a heat insulating material and to efficiently heat and fuse a resin material by a reduced quantity of steam. SOLUTION: Steam flows in the gap between the inner plates 4a and outer plates 4b of upper and lower inner molds to rapidly heat metal nets 6 and flows in a molding chamber 8 through a large number of the injection holes 16 bored in the inner plates 4a. By this constitution, the material 17 in the molding chamber 8 is heated by high temp. steam and the particles of the material are mutually fused while, expanded. Since the peripheries of the inner molds 4 are covered with heat insulating materials 7, even if a mold body 1 is large, there is no fear of lowering the heating efficiency of the inner molds and the material 17 can be effectively heated and fused by a reduced quantity of steam and a molding time is shortened and the consumption quantity of steam can be conserved.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for producing a foamed resin molding used for packing heat insulating materials and articles.

[0002]

2. Description of the Related Art FIG. 4 schematically shows an example of a conventional foamed resin molding, for example, a polystyrene foam manufacturing apparatus.
Is a lower mold, and b is an upper mold fixedly placed on the upper part of the lower mold a.

The lower mold a and the upper mold b are formed with a steam chamber c to which a steam source such as a boiler (not shown) and a higher temperature steam are supplied. A cooling water pipe e having a plurality of nozzles d is housed in each steam chamber c.

A granular resin material h containing a foaming agent is filled in a closed molding chamber g formed between a recess f in the upper part of the lower mold a and a lower surface of the upper mold b. .

High temperature (around 120 ° C) in the upper and lower steam chambers c
When the above vapor is sent and the entire upper and lower sides a and b are heated, the resin material h is rapidly expanded and fused to each other. After elapse of a certain time, steam is discharged, cooling water is sent to the cooling water pipe e to cool the upper and lower molds a and b to a predetermined temperature, and then the mold is removed, whereby a desired foamed resin molded body is obtained.

[0006]

In the above-mentioned conventional apparatus, since the entire upper and lower molds a and b are heated, the heating efficiency is poor, the molding time becomes long, and the productivity is lowered. In particular, when a large mold is used to manufacture a large and thick foamed resin molded body, it is necessary to supply a large amount of steam,
The running cost is increased by increasing the capacity of the boiler and the manufacturing cost is increased.

Further, since the molded body is cooled through the mold, the cooling efficiency is poor, the time until demolding becomes long, and a large amount of cooling water is required, which is uneconomical.

Further, in order to enhance the heating effect, the steam chamber c
If the capacity is large or the cooling water pipe e is housed in the steam chamber c, there is a problem that the entire device becomes large.

The present invention has been made in view of the above-mentioned problems, and by improving the heating and cooling efficiency of the mold, the productivity can be improved and the steam and cooling water can be saved. It is intended to provide a manufacturing apparatus of.

[0010]

In order to achieve the above object, an apparatus for producing a foamed resin molded body of the present invention has a molding chamber in which a foamable resin material is filled, and
An inner plate having a large number of ejection ports communicating with the forming chamber, and an outer plate disposed outside of the inner plate with a required distance therebetween are provided, and a steam supply source and a supply plate are provided between the inner plate and the outer plate. It is characterized in that the periphery of a mold that can be divided into two, in which a space that can be sequentially switched between the steam chamber and the cooling chamber is formed by being connected to a water source, is covered with a heat insulating material.

In the above apparatus, it is preferable that the inner plate has a thin wall and a wire mesh having good heat conductivity is housed between the inner plate and the outer plate.

In the above apparatus, it is preferable that the ejection port comprises a large number of concentric or radial small holes.

According to the present invention, since the periphery of the outer plate of the molding die is covered with the heat insulating agent, the heating efficiency is improved, and the resin material can be effectively heated and fused with a small amount of steam. Molding time is shortened. Further, since the mold is directly cooled by the cooling water introduced into the space between the inner plate and the outer plate,
Cooling efficiency is also high, and the time until demolding is shortened.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings. In FIG. 1, reference numerals 1 and 1 denote a pair of upper and lower or left and right molds having substantially the same shape, and abutting mutually facing surfaces thereof, a predetermined flange portion 1a is provided between the left and right open ends of each mold 1. They can be integrated by pressing each other with the pressing tools.

The upper and lower mold bodies 1 are composed of an inner mold 4 having an inner-outer double structure in which a concave portion 3 for molding is formed on the opposite surface, and an outer mold 5 covering the outer side thereof. The inner mold 4 includes an inner plate 4a made of a thin stainless plate and an outer plate 4 separated from the inner plate 4a by a required dimension.
b, and the space between the inner plate 4a and the outer plate 4b serves as a steam chamber and a cooling chamber, and the wire mesh 6 made of a copper material or the like having good heat conductivity is accommodated in the space. With this wire net 6, even if the inner plate 4a and the outer plate b are thin plates, their shapes can be maintained.

A heat insulating material 7 made of glass wool or urethane foam is filled between the outer mold 5 and the outer plate 4b.

A horizontally long rectangular space composed of the recesses 3 of the upper and lower inner molds 4 forms a closed molding chamber 8.

From the left side plates of the outer plates 4b of the upper and lower inner molds 4, the steam supply pipe 9 has openings at the inner plate 4a and the outer plate 4.
It communicates with the space in the longitudinal direction between b. Each steam supply pipe 9 is connected to a steam supply source (not shown) such as a boiler via a solenoid valve 10 that is turned on and off by a control device (not shown).

On the other hand, on the right side plate of each outer plate 4b, the cooling water supply pipe 11 is provided with the opening portions as in the above, the inner plate 4a and the outer plate 4b.
They are communicated so as to face the longitudinal gap between them. Each cooling water supply pipe 11 is a water supply source (not shown) via the solenoid valve 10.
Is connected to

The steam supply pipe 9 and the cooling water supply pipe 11 are alternately supplied with steam and cooling water by the control device alternately turning on and off the respective electromagnetic valves 10. ing.

Communication holes 12 are formed in the inner plates 4a of the mating surfaces of the upper and lower inner molds 4, and the steam and cooling water supplied to the upper inner molds 4 flow to the lower inner molds 4 when they are drained. It is like this.

A drain pipe 13 is connected to a substantially central portion of the outer plate 4b of the lower inner mold 4, and when the solenoid valve 10 is operated, steam or cooling water between the inner plate 4a and the outer plate 4b is discharged. To be done.

2 and 3 on the entire surface of the upper and lower inner plates 4a.
As shown in the enlarged view of FIG.
A plurality of concentric circles or radially arranged nozzles 16 are regularly formed at regular intervals.

Next, a description will be given of a procedure for manufacturing a foamed resin molded product using the apparatus of the above embodiment.

First, the molding chamber 8 is filled with a predetermined amount of a granular resin material 17 containing a foaming agent, and then the upper and lower mold bodies 1 are filled.
Is pressed and fixed, and the molding chamber 8 is closed.

Next, the solenoid valve 10 of the cooling water supply pipe 11 is turned off and the solenoid valve 10 of the steam supply pipe 9 is turned off.
N, and saturated steam having a temperature of about 120 ° C. is fed from the boiler to the steam supply pipe 9.

Then, the steam flows between the inner plate 4a and the outer plate 4b of the upper and lower inner molds 4 to rapidly heat the wire net 6 and, at the same time, through a large number of ejection ports 16 formed in the inner plate 4a. It flows into 8. As a result, the material 17 in the molding chamber 8 is heated by the high-temperature steam, and the particles of the material 17 expand and fuse together.

After the lapse of a predetermined time, the electromagnetic valve 10 is turned off to stop the supply of steam to the steam supply pipe 9, and the electromagnetic valve of the drain pipe 13 is turned on to discharge the steam in the inner mold 4.

Then, with the solenoid valve of the drain pipe 13 turned on, the solenoid valve of the cooling water supply pipe 11 is turned on to supply the cooling water from the water supply source to the space of the inner mold 4 so that the entire inner mold 4 is closed. Cooling.

As a result, the molded body after fusion is hardened and cooled to a predetermined temperature (for example, around 60 ° C.),
By stopping the supply of cooling water and removing the mold, a desired foamed resin molded body can be obtained.

At the time of molding, since the periphery of the inner mold 4 is covered with the heat insulating material 7, the heating efficiency of the inner mold 4 does not decrease even if the mold body 1 is large, and the amount of steam is small. 17 can be heated and fused effectively, the molding time can be shortened, and the steam consumption can be reduced.

The metal net 6 of the inner mold 4 is also heated at the same time, but since it has high thermal conductivity, it does not adversely affect heating and cooling.

Further, since the inner mold 4 is directly cooled by the cooling water, the cooling efficiency is high, the time until the demolding is shortened, and the consumption of the cooling water is reduced.

Since the space of the inner mold 4 is shared by the steam chamber and the cooling chamber, the overall size and weight of the apparatus can be reduced.

Since the steam outlets 16 are concentric or radial, the steam is diffused in a wide range and uniformly permeates the material 17, and uneven fusion can be prevented.

In the above embodiment, the outer die 5 is provided,
Although the heat insulating material 7 is filled between this and the inner mold 4, the outer mold 5 may be omitted and only the heat insulating material 4 may cover the periphery of the inner mold 4.

Although the embodiments of the present invention have been described above with reference to the drawings, the specific configuration is not limited to these embodiments, and even if there are changes and additions within the scope not departing from the gist of the present invention, the present invention is not limited. Included in the invention.

[0038]

According to the present invention, the following effects can be obtained.

(A) Since the heating efficiency of the molding die is improved,
The resin material can be efficiently heated and fused with a small amount of steam, the molding time can be shortened and the productivity can be improved, and the consumption of steam can be reduced to reduce the cost.

(B) Further, since the cooling efficiency is also improved, the time until demolding is shortened and the production efficiency is improved, and
It requires less cooling water.

(C) Since the space of the molding die is shared by the steam chamber and the cooling chamber, there is no fear that the entire apparatus becomes large as in the conventional case.

(D) According to the second aspect of the invention, since at least the shape of the inner plate 4a in the molding die can be maintained, the inner plate 4a can be made thinner and the heat transfer efficiency can be further improved.

(E) According to the third aspect of the invention, since the vapor diffuses over a wide range, uneven fusion of the resin material is prevented.

[0044]

[Brief description of the drawings]

FIG. 1 is a vertical sectional front view showing an embodiment of the present invention.

FIG. 2 is a front view showing the shape of the ejection port of the inner plate.

FIG. 3 is a front view showing another example of the shape of the ejection port.

FIG. 4 is a vertical sectional front view showing a conventional device.

[Explanation of symbols]

 1 Mold 1a Flange 3 Recess 4 Inner Mold (Molding Mold) 4a Inner Plate 4b Outer Plate 5 Outer Mold 6 Wire Mesh 7 Insulation Material 8 Molding Chamber 9 Steam Supply Pipe 10 Solenoid Valve 11 Cooling Water Supply Pipe 12 Communication Hole 13 Drain Pipe 14 circular hole 15 long hole 16 jet 17 resin material

Claims (3)

[Claims] 1. An inner plate having a molding chamber in which a foamable resin material is filled and having a large number of ejection ports communicating with the molding chamber, and an inner plate provided outside the inner plate with a required distance. An outer plate is provided, and a space that can be sequentially switched between the steam chamber and the cooling chamber is formed between the inner plate and the outer plate by being connected to the steam supply source and the water supply source.
An apparatus for producing a foamed resin molded body, characterized in that the circumference of a mold that can be divided is covered with a heat insulating material. 2. The inner plate is made thin and a wire mesh having good thermal conductivity is housed between the inner plate and the outer plate.
An apparatus for manufacturing a foamed resin molded article according to. 3. The apparatus for producing a foamed resin molded article according to claim 1, wherein the ejection port is composed of a large number of small holes arranged in a concentric circle or in a radial pattern.