KR101396903B1 - Particle foam plastic molding apparatus - Google Patents

Abstract

A foamed resin molding apparatus capable of expressing surface texture is disclosed. The foamed resin molding apparatus according to the present invention comprises a pair of movable molds and a stationary mold for forming a cavity for product molding at the central portion when assembled, a bead charger (not shown) for filling a small bead- To supply heat to the foamed resin filled in the cavity and to cool the foamed resin, the steam supplied through the steam pipe, the cooling water pipe, and the steam pipe installed in the respective molds is directly supplied to the foamed resin filled in the cavity. A plurality of steam discharging members provided so as to be exposed on the molding surface of the mold, and a texturing member composed of a steam permeable material and covering the molding surface of each of the molds.

Description

(Particle foam plastic molding apparatus)

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a foamed resin molding apparatus for manufacturing various industrial products including a packaging material, a heat insulating material, a vehicle part, and the like. More specifically, the present invention relates to a foamed resin molding apparatus, To a molding apparatus.

 In general, foaming moldings produced by foam molding are lightweight but excellent in buffering and insulation effects. They are widely used for various purposes and purposes for various industrial purposes, including packaging materials for returning products, insulation materials and vehicle parts. . BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic view schematically showing the overall configuration of a foamed resin molding apparatus adopted for foam molding.

1, a conventional foamed resin molding apparatus includes a pair of movable mold 1 and a stationary mold 2 for forming a cavity 3 for molding a product at the center when assembled, A bead charger 4 for filling beads filled with the beads, a cooling water pipe 6 and a steam pipe 7 installed in the respective molds for heating or cooling the beads filled in the cavities, A steam discharge port 5 for discharging steam by a steam pipe is formed.

In the conventional structure, the movable mold 1 and the stationary mold 2 have a hollow hollow structure, and a steam chamber (not shown) capable of flowing steam discharged from the steam pipe 7 installed therein is formed The two molds are heated to a high temperature of about 120 ° C. by the steam introduced into the steam room, and a part of the steam flows out of the mold through the steam discharging opening 5, and the molding in the cavity 3 The raw material, that is, the foamed bead, is directly heated.

The molded product molded through the foamed resin molding apparatus having the above-described structure is subjected to a separate surface treatment in accordance with the request of the market in consideration of the purpose of use, design, etc., so that a different texture can be expressed on the surface thereof. However, in order to express the texture on the surface of the molded article, a surface processing step separate from the foaming molding process for producing a molded article must be accompanied. In this case, the productivity of the product is lowered and the manufacturing cost is increased.

Korea Patent Publication No. 2010-0044679

It is an object of the present invention to provide a foamed resin molding apparatus capable of expressing a different texture on the surface of a molded article at the same time as a molded article is formed and thus capable of expressing a surface texture in which a surface processing step for surface processing is not separately required will be.

As a means for solving the problem, the present invention provides a mold for molding a product, comprising: a pair of movable molds and a stationary mold for forming a cavity for product molding at a central portion when assembling; A bead charger for filling the cavity with a foaming resin of a small bead shape (bead); A steam pipe and a cooling water pipe installed in respective molds for heating and cooling the foamed resin filled in the cavity; A plurality of steam discharging members provided so as to be exposed to the molding surfaces of the respective molds so that steam supplied through the steam pipes can be directly transferred to the foamed resin filled in the cavities; And a texture-indicating member made of a steam-permeable material and covering the molding surface of each of the molds.

In the present embodiment, each of the molds may have a structure capable of replacing the textured display member.

Preferably, the pair of stationary molds and movable molds are composed of one bottom member having one flat forming surface and a plurality of side wall members forming a frame on the bottom member, and can be disassembled and assembled, The edges of the textured display member are fixed in a shape in which the edges of the textured display member are fixed between the assembled surfaces to which the textured display members are connected.

In this case, the texturing member may be a fabric woven such that warp yarns and weft yarns cross each other. Alternatively, the texturing member may be a metal mesh having fine holes.

Further, in the present invention, the steam discharging member is constituted by a plurality of transverse members and a longitudinal member which integrally connects the transverse members on the back side of the transverse members, and each of the transverse members is spaced apart in parallel along the width direction So that a steam discharge path having the slit-shaped discharge port at the front end is formed between the respective transverse members.

At this time, each of the horizontal members constituting the steam discharging member has a trapezoidal or inverted triangular cross-section having a narrower width from the upper surface exposed side to the lower surface. Thus, the steam discharging path formed between the horizontal members has a cross- It may be a structure constituting a nozzle-like structure that narrows.

According to the foamed resin molding apparatus of the present invention, the molding surface of each metal mold for product molding is covered with a texturing member of steam-permeable material, so that, when the molded product is manufactured, A unique texture can be expressed by a texturing member. That is, there is no need for a separate surface processing step for surface processing, so productivity and productivity can be expected to be reduced in the production of surface treated products.

Further, each of the molds has an assembling structure that can be disassembled and assembled, and the edge of the texturing member is fixed between the assembling surfaces to which the members are connected, so that the texturing member can be easily replaced by disassembling the mold Accordingly, even if a product having different texture expression is required according to the demand of the user, it is possible to satisfy various market needs by replacing only the textured member without replacing the entire mold.

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a schematic sectional view schematically showing the overall configuration of a conventional foamed resin molding apparatus. Fig.
BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a foamed resin molding apparatus.
Fig. 3 is an enlarged cross-sectional view showing a main portion of the foamed resin molding apparatus shown in Fig. 2 in an enlarged scale.
Fig. 4 is an exploded side view of the mold of the foamed resin molding apparatus shown in Fig. 2 of the present invention. Fig.
Fig. 5 is a perspective view of a steam discharging member mounted on a molding surface of each metal mold in the apparatus for molding resin foam shown in Fig. 3; Fig.
FIG. 6 is a bottom perspective view of the steam discharging member according to FIG. 5;
7 is a side sectional view of the steam discharging member according to Fig.
FIG. 8 to FIG. 11 are views sequentially illustrating a process of manufacturing a foamed molded product through a foamed resin molding apparatus according to an embodiment of the present invention.
12 is a photograph of the surface of a molded article molded through a conventional foamed resin molding apparatus and a molded article molded by the foamed resin molding apparatus according to the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the description of the present invention, a detailed description of known configurations will be omitted, and a detailed description of configurations that may unnecessarily obscure the gist of the present invention will be omitted. Also, the terms and words used below should not be construed as being limited to ordinary or dictionary terms, and should be construed as meaning and concept consistent with the technical idea of the present invention.

Fig. 2 is a schematic cross-sectional view schematically showing the overall configuration of a foamed resin molding apparatus according to an embodiment of the present invention, and Fig. 3 is an enlarged cross-sectional view of a main portion showing an essential part of the foamed resin molding apparatus shown in Fig. The overall configuration of the foamed resin molding apparatus according to the present invention will be schematically described first.

2 to 3, a foamed resin molding apparatus according to the present invention basically comprises a pair of movable molds 30 for forming a cavity 30 for molding a product at the center when assembling, And a bead filler 40 for filling the molding material foamed in the cavity 30. The mold 30 is provided with a steam pipe (not shown) for heating or cooling the molding material filled in the cavity, 70 and a cooling water pipe 60 are installed.

The movable mold 10 and the stationary mold 20 have a hollow structure in which a steam chamber (not shown) capable of flowing steam discharged from the steam pipe 70 is formed, and introduced into the steam chamber The two molds are heated to a high temperature of about 120 ° C by the steam. A part of the steam flows out of the steam chamber through the steam discharging member to be described later, and directly heats the molding material in the cavity 30 by the merging of the two molds.

As the molding material for molding the foamed product, a foaming resin in the form of a small bead is used. Preferably, expanded polypropylene (EPP) may be used. EPP is a foam of white polypropylene, which has a closed cell structure and is lightweight, has a high impact resistance against external impact, is excellent in chemical resistance and heat resistance, and has a specific molding condition The product can be implemented with various densities and compressive strengths.

A plurality of steam supply members 80 are provided on the molding surfaces of the movable mold 10 and the stationary mold 20 for partitioning the cavity 30. The steam discharging member 80 forms a path through which the steam heat supplied through the steam pipe 70 can be transmitted to the foamed resin filled in the cavity 30. [ In the present invention, the plurality of steam discharging members 80 are arranged so as to be exposed on the molding surface in an N x M matrix arrangement.

On the molding surface of each of the molds 10 and 20 provided with the steam discharging member 80, a texturing member 100 for a steam-permeable material is positioned and covers the molding surface. Preferably, the texturizing member 100 may be a fabric in which warp yarns and weft yarns are interwoven with each other so as to cross over one another. Alternatively, the texture display member 100 may be a metal mesh having fine holes of a predetermined size in the horizontal and vertical directions.

The pair of stationary molds 10 and movable molds 20 includes one bottom member 12 and one flat molding surface 22 and a plurality of side wall members 14 24, and is detachably assembled, and the edge of the texturing member 100 is fixed between the assembling surfaces to which the members are connected. Therefore, the texture expression member 100 can be easily replaced through decomposition of the mold.

5 to 7 are views showing the above-described steam discharge member provided on the molding surface of each metal mold.

As shown in the drawing, the steam discharging member 80 applied to the present invention has a slender and long discharge port 82a. The plurality of slit-shaped discharge ports 82a formed in one steam discharge member 80 are arranged to be spaced apart in parallel at regular intervals. To this end, the steam discharging member includes a transverse member 84 which is parallel and spaced apart with a predetermined gap therebetween to form a steam discharging path 82 therebetween, and a vertical member 86 integrally connecting the transverse members at the rear surface of the transverse member .

At this time, as shown in FIG. 5, the transverse member 84 may be an elongated bar-shaped structure having a trapezoidal or inverted triangular cross-section having a narrower width from the upper portion to the lower portion. When the horizontal member 84 is formed in a trapezoidal or inverted triangular cross-sectional shape, the steam discharge path 82 formed between the horizontal members 84 has a nozzle-like structure having a narrower sectional area toward the outlet, So that steam can be ejected at a high speed.

The steam discharging member 80, which is composed of a plurality of the horizontal members 84 and the vertical members 86, may be made of a metal material which is lightweight but has excellent durability and high temperature heat resistance. A preferable example is stainless steel or aluminum alloy. However, it is not limited to examples of stainless steel or aluminum alloy. That is, the present invention can be applied to a material having light durability and high temperature resistance as described above without being limited to a specific material.

Hereinafter, a foam molding process for fabricating a shock-absorbing packaging material through the foam resin molding apparatus having the above configuration will be described in connection with the operation of the foam resin molding apparatus.

FIGS. 8 to 11 are views sequentially illustrating a process of manufacturing a packaging material through a foamed resin molding apparatus according to an embodiment of the present invention.

8, the movable mold 20 is moved to the stationary mold 10 side so that the movable mold 20 and the stationary mold 10 are combined to form a cavity 30 The EPP bead, which is a molding material, is strongly inflated with compressed air to be filled. At this time, the steam can be quickly discharged through the steam pipe 70 with a strong pressure so that the charging can be smoothly performed through the pressure difference.

When the bead filling is completed, steam is introduced into the movable mold 20 and the stationary mold 10 as shown in FIG. 9, and steam is applied to the EPP bead filled through the steam discharging member 80, thereby expanding the bead , And a steaming process for fusion is performed. When steam heat is applied to the bead particles filled in the cavity 30, the surface of the bead particles melts and the foaming agent in the beads expands to remove the air between the particles, and at the same time, the particles are firmly bonded to each other.

When the foam molding is completed through the above process, as shown in FIG. 100, the foamed pressure inside the cavity 30 is lowered so as to prevent further deformation by the foaming agent remaining in each bead particle, 10 are cooled. For this cooling, cold cooling water can be injected into each of the molds 20 (10) through the cooling water pipe 60, or the pressure can be lowered through vacuum suction and the mold can be cooled.

Finally, after cooling is completed through the above process, the molding 90 is separated from the mold through a demoulding process as shown in FIG. When the molded product 90, for example, the packaging material is pushed out of the stationary mold 10 by operating the ejector 19 while the upper mold 20 is lifted and separated from the lower mold 10, , And the molded product 90 is separated from the stationary mold 10 to complete the production.

Fig. 12 is a photograph of the surface of a molded article molded through a conventional foamed resin molding apparatus and a molded article molded by the foamed resin molding apparatus according to the present invention. Fig. 12 (b) And shows the surface of the molded article by the molding apparatus according to the invention.

Referring to FIG. 12, in the case of a molded article formed by the conventional foamed resin molding apparatus shown in FIG. 12 (a), the foamed resin as a molding material after molding is exposed on the surface in a rugged form, (B), it can be clearly seen that the texture is expressed in a very flat and fine lattice pattern, such as a cloth with a hue on the surface of a molded article.

As described above, according to the present invention, the molding surface of each metal mold for product molding is covered with a texturing member of steam-permeable material, so that when the molded product is manufactured, To express a unique texture. That is, there is no need for a separate surface processing step for surface processing, so productivity and productivity can be expected to be reduced in the production of surface treated products.

Further, each of the metal molds has an assembling structure that can be disassembled and assembled, and the edges of the texturing member are fixed between the assembling surfaces to which the members are interconnected, so that the texturing member can be easily replaced by disassembling the metal mold . Therefore, even if a product having different texture expression is required according to the demand of the user, it is possible to satisfy various market needs by replacing only the texturing member without replacing the entire mold.

In the foregoing detailed description of the present invention, only specific embodiments thereof have been described. It is to be understood, however, that the invention is not to be limited to the specific forms thereof, which are to be considered as being limited to the specific embodiments, but on the contrary, the intention is to cover all modifications, equivalents, and alternatives falling within the spirit and scope of the invention as defined by the appended claims. .

10: Fixed mold 19: Ejector
20: movable mold 30: cavity
40: bead charger
60: cooling water pipe 70: steam pipe
80: a steam discharging member 82: a steam discharging path
82a: Slit-shaped outlet 84:
86: longitudinal member 90: molded article

Claims (7)

A pair of movable molds and a stationary mold for forming a cavity for product molding at a central portion when assembled;
A bead charger for filling the cavity with beads in a bead shape;
A steam pipe and a cooling water pipe installed in respective molds for heating and cooling the foamed resin filled in the cavity;
A plurality of steam discharging members provided so as to be exposed to the molding surfaces of the respective molds so that steam supplied through the steam pipes can be directly transferred to the foamed resin filled in the cavities; And
And a texture display member made of a material permeable to steam and covering the molding surface of each mold,
The steam discharging member is constituted by a plurality of transverse members and a longitudinal member which integrally connects the transverse members on the back surface of the transverse member, and each of the transverse members is spaced apart in parallel with a predetermined gap, A steam discharge path is formed at the tip of the steam discharging passage,
Wherein the horizontal member has a trapezoidal or inverted triangular cross section having a narrower width from the upper surface side to the lower side, and the steam discharge path formed between the horizontal members has a nozzle-like structure having a smaller cross sectional area toward the outlet side A foaming resin molding device capable of expressing surface texture.
The method according to claim 1,
Wherein each of the molds has a structure capable of replacing the texturing member.
3. The method of claim 2,
Wherein the pair of stationary molds and movable molds are composed of one bottom member having one flat forming surface and a plurality of side wall members forming a frame on the bottom member,
Wherein the edges of the textured display member are fixed in a shape in which edges of the textured display member are fixed between the assembling surfaces to which the respective members are connected to each other so that the textured display member can be replaced through disassembly of the respective molds.
4. The method according to any one of claims 1 to 3,
Wherein the texture expression member is a fabric that is woven in such a manner that warp (weft yarn) and weft (weft yarn) cross each other over the top.
4. The method according to any one of claims 1 to 3,
Wherein the texture expression member is a metal mesh.
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