KR101413151B1 - Particle foam plastic molding apparatus - Google Patents

Abstract

Disclosed is a device for molding a foamed resin plate. The device for molding a foamed resin plate according to one embodiment of the present invention includes a pair of movable mold and fixed mold which use a foamed resin of a small bead shape as a molding material and form a cavity for molding a product in the center, and a core unit which is detachably mounted on both insides of the fixed mold to mold an uneven connection unit on both ends of a plate.

Description

[0001] The present invention relates to a foam plastic molding apparatus,

The present invention relates to a foamed resin plate molding apparatus, and more particularly, to a foamed resin plate molding apparatus for molding a foamed resin plate having concave-convex connection portions formed at both ends thereof with fastening holes.

Foam packaging materials are widely used for product packaging and safe transport. The foamed packaging material is advantageous in that it is lighter in weight than other packaging materials, for example, a general paper material, and can store and transport the product more safely. However, it is disadvantageous in terms of storage and transportation due to its large volume as compared with general packing materials of paper materials.

Korean Patent Publication No. 2009-0006516 discloses a method of folding a packaging box using a panel-shaped packaging material that is foam-molded as a folding-type transfer box, and folding the packaging box before use for packaging. And thus, a technique for securing advantages in storage and movement is disclosed.

In order to realize the folding type, in the above-mentioned prior art, a concave-convex connection portion is formed along the edge of the foamed resin plate member, and the concave-convex connection portion is engaged with the center portion of the concave-convex connection portion which is engaged with one long- So that the foamed resin plate members can be folded mutually about the hinge axis.

In the molding of the foamed resin plate material having the concave-convex connection portion, the cavity between the movable mold and the stationary mold is filled with a small bead-shaped foamed resin to be a molding material, and heating and cooling are repeated at a constant temperature and pressure condition An injection method in which a small bead-shaped foam resin forms a firm bond with each other to form a product is used.

Fig. 1 schematically shows a conventional foamed resin molding apparatus used in molding the packaging material disclosed in the prior patent.

1, the conventional molding apparatus includes a movable / stationary mold 1 (2) for forming a cavity 3 for molding a product at the center when assembled, a bead-shaped foamed resin (bead, a bead charger 8 for filling the bead with a bead, a steam pipe 7 for cooling or cooling the charged bead, and a cooling water pipe 6. Heat is directly transmitted to the bead on the molding surface of each metal mold So that the steam discharge port 5 is formed.

When forming the foamed resin plate member having concave-convex connection portions at both ends through such a foamed resin molding apparatus, a hole through which a long hinge shaft for connection between the plate members is inserted is described as a fastening hole 211a Should be formed at the center of the concave-convex connection portion. For this, the long core pin 40 as shown in FIG. 2 is used in the molding process.

The core pins 40 are assembled in a sliding manner on the side of the stationary mold 1 prior to product molding and are fixed so as to be positioned on the spaces at the inner ends of both sides of the stationary mold 1. When the core pins are completely mounted, ) Are filled and the foamed beads are filled with the cavities of the composite. The product is molded by heating and cooling the filled bead.

However, in the conventional structure in which the core pin is assembled in a sliding manner on the side of the stationary mold, a clearance sufficient to assemble the core pin 40 on the mold side must be secured to the side of the mold. There is a problem that the space utilization is lowered and the manufacturing cost and the production cost are increased due to the technical restriction to assemble the core pin on the side of the mold.

Korean Published Patent Application No. 2009-006516 (published on January 15, 2009)

It is an object of the present invention to provide a method of assembling or separating a core pin from a mold without requiring a separate side space for assembling or separating the core pin, And to provide a foamed resin plate material forming apparatus having a structure that can be made.

As a means for solving the problems, the present invention provides an apparatus for forming a foamed resin plate material having both sides of a concave-convex connection portion on which a fastening hole is formed, comprising: a stationary mold having a flat formed surface; A movable mold having a molding surface having a uniform surface facing the molding surface of the stationary mold; And a core part detachably installed on both inner ends of the stationary mold for forming the concave-convex connection part, wherein the core part is constituted by a plurality of molders fitted at a predetermined interval to the core pin and the core pin, And a core pin mounting portion on which both end portions of the core pin are seated and fixed is provided on the inner end side inner wall surfaces.

Wherein the core pin mounting portion includes an entrance path formed in a straight line along a direction coinciding with a direction in which the movable mold is separated from the stationary mold so that both end portions of the core pin can be inserted and removed and a curved concave seating surface .

The movable mold having a position corresponding to the core pin mounting portion is provided with a fixed protruding portion engaged with the movable mold and the fixed mold when engaged with the straight entry / exit path, so that the core pin is confined between the fixed seating portion and the seating surface .

At this time, a curved holding surface having a curvature close to the outer edge of the upper portion of the core pin placed on the seating surface may be formed at the tip of the fixed projection.

In the embodiment of the present invention, the molding part of the core part may be provided with a groove on one side and a convex part on the other side of the opposite part.

In this case, it is preferable that the recessed portion and the convex portion are recessed and protruded in such a manner that they can be engaged with each other.

In addition, positioning pins may be formed on the core pins constituting the core portion at regular intervals, and positioning grooves may be formed in the center of the inner periphery of the core pin through-holes at the center of the formers.

Alternatively, the core fin constituting the core portion may be provided with positioning recesses at regular intervals, and the positioning protrusions may be formed in the center of the inner periphery of the core pin through-hole at the center of the formulator.

According to the foamed resin plate forming apparatus according to the embodiment of the present invention, since the core pin is detachably mounted in the direction in which the movable mold is separated from the stationary mold, The core pin assembly separating operation can be performed more easily without securing the clearance.

That is, in the related art, the core pin has to be inserted or separated from the mold at the stationary mold side portion which is highly limited by the spatial constraint during the core pin disassembly / assembly. However, in the present invention, the core pin is assembled and separated The core pin can be easily assembled into the mold or separated from the mold without any additional side space.

In addition, since the molding core for forming the concave-convex connection portion at the both ends of the foamed resin material is provided on the core fin, it is possible to simplify the mold and lower the production cost since it is not necessary to process the molding surface of complicated uneven shape on the mold, It is possible to form protrusions and recesses which can increase the coupling force in the concave-convex connection portion due to the convex portion and the concave portion formed on the both side surfaces.

Furthermore, it is possible to freely change the size and spacing of the molding member fitted to the core pin, and thereby, the width of the convex portion of the concave-convex connection portion and the layout (ray-out) The advantage is that you can change it freely. That is, there is an advantage that it is very advantageous in design change and mass production of products.

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a schematic structural view schematically showing the overall configuration of a conventional foamed resin molding apparatus. Fig.
2 is a view showing a state in which a core pin is fitted in a sliding manner through a stationary mold side portion in a conventional foamed resin molding machine.
3 is a perspective view illustrating a state where a movable mold and a stationary mold of a foam resin sheet molding apparatus according to an embodiment of the present invention are separated.
FIG. 4 is an enlarged perspective view of the 'A' portion of FIG. 3; FIG.
5 is a cross-sectional view of a core pin mounting portion in a state where two molds shown in Fig.
6 is a perspective view of the core portion shown in Fig. 3;
FIG. 7 is a front view of the core shown in FIG. 3; FIG.
8 is a cross-sectional view of the core portion of the molder in a state in which two molds shown in Fig.
9 is a perspective view of a foamed resin plate material molded through a molding apparatus according to an embodiment of the present invention.
FIGS. 10 to 13 are views sequentially illustrating a process of manufacturing a plate material through a foamed resin plate molding apparatus according to an embodiment of the present invention. FIG.

Hereinafter, preferred embodiments of the present invention will be described in detail. 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. In the drawings, the same reference numerals are given to the same components as those previously described.

The foamed resin plate molding apparatus according to the embodiment of the present invention basically includes a pair of movable molds and a fixed mold bead charger that form a cavity for product molding, similar to the above-described foamed resin molding apparatus of Fig. 1, And a steam pipe and a cooling water pipe for cooling the molten molding material are installed in the respective molds.

However, unlike the related art, a molding member for forming the concave-convex connection portion is provided on the core fin, so that it is not necessary to process the molding surface having a complicated concavo-convex shape on the mold. In addition, the core pin for the fastener- The mold can be assembled or separated from the mold along the direction in which the molds are assembled or separated so that the space can be efficiently utilized.

A molding apparatus for manufacturing a foamed resin plate according to an embodiment of the present invention will be described in more detail with reference to the accompanying drawings.

3 is a perspective view illustrating a state where the movable mold and the stationary mold of the foamed resin plate molding apparatus according to the embodiment of the present invention are separated, and FIG. 4 is an enlarged perspective view of the 'A' portion of FIG.

3 to 4, inside the two molds 1 and 2 having a hollow hollow structure, a steam pipe 7 for heating or cooling the molding material filled in the cavity 3 at the time of molding, And a cooling water pipe 6 are installed. A steam outlet 5 is formed on the molding surface of each mold so that the heat provided through the steam pipe 7 can be directly applied to the molding material filled in the cavity 3.

9, the core portion 4 is detachably provided on the inner side of the molding portion of the stationary mold 1, and the core portion 4 A core pin mounting portion (not shown) is provided on both inner side wall surfaces (total of four locations) of the inner end of the stationary metal mold 1 so as to fix both ends of the core pin 40 constituting the core portion 4 12 are formed.

4, the core pin mounting portion 12 is composed of a straight entry / exit path 120 and a core pin receiving surface 122 formed at the bottom of the straight entry / exit path 120. [ The entry path 120 is formed in a straight line so that both end portions of the core pin 40 can enter and exit along the direction coinciding with the direction in which the movable mold 2 is separated from the stationary mold 1, Is formed concavely for stable seating of the core pin (40).

The movable mold 2 at the position corresponding to the position where the core pin mounting portion 12 of the stationary mold 1 is formed is provided with the fixing protrusion 20. When the movable mold 2 and the stationary mold 1 are combined for foam molding, the stationary protrusions 20 are engaged with the linear-shaped openings to close the opening and closing sections, and at the same time, restrain the core pin 40 placed on the seating surface 122 Thereby preventing the core portion 4 from flowing during the foaming process (see Fig. 5).

The first and second molds 1 and 2 can be confined by wrapping around the outer edge of the core pin 40 when assembled to the front end of the fixed protrusion 20, The holding surface 222 is formed. At this time, the holding surface 222 and the seating surface 122 may be formed in a circular arc shape having a curvature enough to closely contact the outer edge of the core pin 40.

The core portion 4 shown in Figs. 6 to 7 includes the core pin 40 having an elongated bar shape and a plurality of core pins 40 which are sandwiched by the core pin 40 and are arranged at regular intervals on the core pin 40 And a molding machine 42. In this case, the diameter of the core pin 40 and the length and width of the formers 42 are not particularly limited, and in particular, the formers 42 are not limited to the illustrated shapes and can be variously changed depending on the shape of the molded product .

In consideration of the dimensional accuracy of the concave-convex connection portion 90 (refer to FIG. 9) formed by the core pin 40 and the molding tool 42, the metal pin or the heat resistant plastic such as polyamide which can maintain its shape without deformation even in a high- And the diameter of the core pin 40 and the diameter of the through hole of the molding member 42 are appropriately set so as to prevent the molding member 42 from flowing on the core pin 40 so as to achieve the interference fit.

7, the positioning recess 44 is formed at a small depth in the core pin 40 at a predetermined interval and the positioning projection 46 engaged with the positioning recess 44 is formed The former 42 is accurately positioned at a specified position on the core pin 40 when the molding pin 42 is inserted into the core pin 40. In this case, It is also desirable to be able to be positioned and fixed.

Although not shown, positioning projections are formed at regular intervals in the core pin 40, and positioning recesses for engaging the positioning projections are formed at the center of the inner periphery of the core pin through-hole at the center of the formers, So that the formers 42 can be precisely positioned and fixed at designated positions on the core pin 40 when the formers 42 are fitted to the core pins 40.

The positioning protrusion can be realized by using a material having self-elasticity that is elastically compressed when the core pin 40 enters, and is resiliently restored when the positioning groove is reached, and is engaged with the positioning groove, A ring-shaped elastic body having a cut-out portion or a ball plunger composed of a ball and a spring member for elastically supporting the ball.

A recessed portion 420 is formed on one side surface of the molding member 42 constituting the core portion 4. And a convex portion 424 is formed on one side surface of the opposite portion. The convex portion 424 and the convex portion 424 are formed to have a shape and a size that can be engaged with each other. After the foam molding due to the formation of the convex portion 424 and the concave groove portion 420, Are formed with projections and recesses that mesh with each other when the two plates are foldably connected.

Fig. 8 is a sectional view of the core part in a state in which two molds shown in Fig. 3 are assembled. As shown in Fig. 3, when the movable mold 2 moves in a state where the core part 4 is assembled to the stationary mold 1, The core pin 40 constituting the core portion 4 is restrained by the seating surface and the fixing protrusion 20 shown in Fig. 42 are spaced apart from the bottom of the stationary mold 1 and positioned between the inner walls of the two molds 1, 2, as shown in Fig.

The molding process for producing the foamed resin plate material through the above-described molding apparatus will be described in connection with the operation of the foamed resin plate material forming apparatus.

FIGS. 10 to 13 are views sequentially illustrating a process of manufacturing a foamed resin plate material through a foamed resin plate molding apparatus according to an embodiment of the present invention.

10 (a), when the stationary mold 1 and the movable mold 2 are separated from each other, the core 4 is mounted on both ends of the stationary mold 1, do. In this state, when the operator inputs the molding start command, the movable mold 2 moves to the stationary mold 1 side so that the two molds 1 and 2 are joined together and the cavity between the two molds 1 and 2, (3) is formed.

The EPP bead which becomes the molding material through the bead charger 8 is filled with the compressed air with the strong pressure in the cavity 3 formed by the combination of the movable mold 2 and the stationary mold 1 (Fig. 10 (b) ).

At this time, the steam pipe 7 is in the open state, and air injected with a strong pressure together with the EPP bead is rapidly discharged out of the mold through the steam pipe 7, so that the EPP bead is filled in the cavity 3 .

When all of the beads are filled, steam flows into the movable mold 2 and the stationary mold 1 as shown in Fig. 11, and high temperature heat is applied to the EPP beads filled in the cavity 3. As a result, the surface of the bead heated at a high temperature is melted and the foaming agent in the bead expands, so that the air layer between the bead particles is removed and the particles are firmly bonded to each other.

The mold 1 or the mold 2 is cooled by lowering the pressure of the foamed foam in the cavity 3, as shown in Fig. 12, so that the foaming agent remaining in the bead particles does not further deform. At this time, cooling can be achieved by injecting cold cooling water into each mold through a cooling water pipe 6 or lowering the pressure through vacuum suction.

When cooling is completed, the movable mold 2 is moved and separated from the stationary mold 1, and the product, that is, the plate material is separated from the mold through a demoulding process as shown in FIG. An ejector 19 is used in which the stationary die 1 is moved forward and backward through the molding surface for releasing the product and the core portion 4 is coupled to the concave- The product is separated from the stationary mold 1.

Finally, after the product separated from the mold, that is, the foamed resin plate material, is moved to the workbench, the core pin 40 is pulled out from the product separated from the stationary mold 1, and the molder 42) is separated from the product (see an enlarged perspective view of the product part of Fig. 13).

According to the foamed resin plate forming apparatus according to the embodiment of the present invention, since the core pin is detachably mounted in the direction in which the movable mold is separated from the stationary mold, The core pin assembling and separating operation can be performed more easily without securing the mold side clearance space.

That is, in the related art, the core pin has to be inserted or separated from the mold at the stationary mold side portion which is highly limited by the spatial constraint during the core pin disassembly / assembly. However, in the present invention, the core pin is assembled and separated The core pin can be easily assembled into the mold or separated from the mold without any additional side space.

In addition, since the molding core for forming the concave-convex connection portion at the both ends of the foamed resin material is provided on the core fin, it is possible to simplify the mold and lower the production cost since it is not necessary to process the molding surface of complicated uneven shape on the mold, It is possible to form protrusions and recesses which can increase the coupling force in the concave-convex connection portion due to the convex portion and the concave portion formed on the both side surfaces.

Furthermore, it is possible to freely change the size and spacing of the molding member fitted to the core pin, and thereby, the width of the convex portion of the concave-convex connection portion and the layout (ray-out) The advantage is that you can change it freely. That is, there is an advantage that it is very advantageous for design change and mass production of the product.

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. .

1: stationary mold 2: movable mold
3: Cavity 4: Core portion
5: steam outlet 6: cooling water pipe
7: Steam pipe 8: Bead charger
9: plate (product) 12: core pin mounting portion
20: fixed protrusion 40: core pin
42: Injector 44: Positioning groove
46: Positioning projection
120: straight entry / exit path 122:
222: Holding face

Claims (8)

And a concave-convex connection portion formed with a fastening hole at both ends thereof,
A stationary mold having a molding surface with a uniform surface;
A movable mold having a molding surface having a uniform surface facing the molding surface of the stationary mold;
And a core portion detachably installed at both inner ends of the stationary mold for forming a concave-convex connection portion,
Wherein the core portion is composed of a core pin and a plurality of formers sandwiched between the core pin and the core pin at regular intervals,
And a core pin mounting portion on which both end portions of the core pin are seated and fixed are provided on inner wall surfaces of both ends of the inner end of the stationary mold.
The method according to claim 1,
Wherein the core-
An entry / exit path formed in a straight line along a direction coinciding with a direction in which the movable mold is separated from the stationary mold so that the both ends of the core pin can enter and exit,
And a curved concave seating surface formed at the lower end of the entry / exit path.
3. The method of claim 2,
Wherein the movable mold having a position corresponding to the core pin mounting portion is provided with a fixed protruding portion engaging with the straight entry / exit path when the movable mold and the stationary mold are assembled.
The method of claim 3,
And a curved holding surface having a curvature that can be brought into close contact with the outer edge of the upper portion of the core pin placed on the seating surface is formed at the tip end of the fixed projection.
The method according to claim 1,
Wherein the molding part of the core part is provided with a groove on one side and a convex part on one side of the opposite part.
6. The method of claim 5,
Wherein the recessed portion and the convex portion are recessed and protruded in such a manner that they can be engaged with each other.
The method according to claim 1,
Wherein a positioning protrusion is formed at a predetermined interval in the core fin constituting the core portion, and a positioning groove is formed in the center of the inner periphery of the core pin through-hole at the center of the molder.
The method according to claim 1,
Wherein a positioning groove is formed in the core fin constituting the core portion at a predetermined interval and a positioning projection is formed in the center of the inner periphery of the core pin through-hole at the center of the former.

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