JP3945593B2 - Foamed resin molding machine and method for producing foamed resin molded product - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention fills a cavity in a mold with a foamed resin molding material, and heat-expands the filled foamed resin molding material to fuse the foamed resin molding material to mold a foamed resin molded product having a predetermined shape. The present invention relates to a foam resin molding machine.
[0002]
[Prior art]
Conventionally, as the foamed resin molding machine, for example, the one described in Japanese Patent Publication No. 58-9741 is known.
The above is for molding a partially reinforced foamed resin molded product, and a predetermined area to be molded with different raw materials in the cavity is partitioned, and the partitioned predetermined Fill the cavity other than the area with the raw material, remove the partition in the predetermined area until the raw material is heated and expanded and the fusion is completed, and then fill the cavity with the raw material different from the above raw material and heat it It is the structure which expands and fuse-molds the whole integrally.
Then, the different kinds of raw materials are zigzag-formed in the boundary area and fused together, thereby increasing the bonding area in the boundary area between the different kinds of raw materials, thereby increasing the strength.
[0003]
[Problems to be solved by the invention]
By the way, high intensity | strength is requested | required of what is used as a cushioning material at the time of packing a heavy article among the foaming molded articles shape | molded with a foaming resin molding machine. Also, among those cushioning materials, those used as cushioning materials with large dimensions, for example, cushioning materials attached to the left and right side edges of the bottom surface and the top and left side edges of the television when packing the television Needless to say, strength is required, and in order to facilitate processing after use, it is required to have a structure in which a predetermined portion can be folded by hand to a certain length.
However, in the above conventional one, by removing the partition between the different kinds of raw materials until the fusion of the raw materials is completed, the fusion area between the different kinds of raw materials is increased, and the strength of the fused portion is increased. Since it aims at raising, there exists a problem that it is not easy to process by folding by hand.
[0004]
Therefore, in order to solve the above-described problems, the present invention aims to realize a foamed resin molding machine and a method for manufacturing a foamed resin molded product that can improve the ease of processing after use of the foamed molded product to be molded. [0005]
[Means for Solving the Problems]
In order to achieve the above object, the present invention provides a foamed resin molding machine that fills a foamed resin molding material into a cavity inside a mold, and heat-expands the filled foamed resin molding material to mold a foamed resin molded product. A plurality of spaces are formed in the cavity, and the plurality of spaces are adjacent to the first space filled with the first foamed resin molding material, the second space, and the second space. the foamed resin molding material is provided with between the plurality of air and a second space to be filled, it is attached to the boundary of the into the cavity first and second spaces, said first A partition member in which a gap is formed in which the first foamed resin molding material filled in the space and the second foamed resin molding material filled in the second space are in contact with each other, and The first and second When the heated expanded resin foam molding material, the technical means that were so as to fuse the first and second foamed resin molding material in contact with each other mutually in the partition member and the gap formed Is adopted.
[0006]
In the invention according to claim 2, in the foamed resin molding machine according to claim 1, the foamed resin molded product is used as a cushioning material when packing a predetermined article,
The partition member employs a technical means that when the foamed resin molded product is used as a cushioning material for the predetermined article, the partition member is attached to a location deviating from the center of gravity of the predetermined article.
[0007]
According to a third aspect of the present invention, in the foamed resin molding machine according to the first or second aspect, the partition member has a stepped portion, and the gap is formed on a predetermined surface of the stepped portion. Adopt the technical means of being.
[0008]
In invention of Claim 4, in the foamed resin molding machine as described in any one of Claim 1 thru | or 3, the said 1st and 2nd foamed resin molding material is granular,
The technical means that the clearance gap formed in the said partition member is below the one particle size of the said 1st and 2nd foaming resin molding material, and is larger than the other particle size is employ | adopted.
[0009]
In the invention according to claim 5, in the foamed resin molding machine according to any one of claims 1 to 4, the first and second foamed resin molding materials are of the same type, and The technical means of being made of materials with different expansion ratios is adopted.
[0010]
According to a sixth aspect of the present invention, in the foamed resin molding machine according to any one of the first to fifth aspects, the first and second foamed resin molding materials are made of different types of materials. Adopt technical means.
[0011]
In the invention according to claim 7, in the foamed resin molding machine according to any one of claims 1 to 6, the first and second foamed resin molding materials are of different types, and The technical means of being made of materials with different expansion ratios is adopted.
[0012]
According to an eighth aspect of the present invention, in the foamed resin molding machine according to any one of the first to seventh aspects, the partition member is a boundary portion between the first and second spaces in the cavity. The technical means of being detachably attached to the head is adopted.
[0013]
In a ninth aspect of the present invention, there is provided a method for producing a foamed resin molded product, wherein the foamed resin molded material is filled into a cavity inside the mold, and the filled foamed resin molded material is heated and expanded to mold the foamed resin molded product. 1, a first space in which the cavity is filled with the first foamed resin molding material, and a second space that is adjacent to the first space and is filled with the second foamed resin molding material are formed. The first foamed resin molding material filled in the first space and the second space filled in the second space are formed at the boundary between the first and second spaces in the cavity. A partition member formed with a gap for contacting the foamed resin molding material with each other is attached, the first space is filled with the first foamed resin molding material, and the second space is filled with the second foamed resin. Material for filling molding material The filling step and the first and second foamed resin molding materials are fused by heating and expanding in a state where the partition member is mounted in the cavity, and in contact with each other in the gap formed in the partition member wherein the first and the heating expansion step of fusing the second foamed resin molding material, it is provided a releasing step of the foamed resin molded body in the cavity which is fused to the release by the heating expansion stroke to In addition, a technical means is used in which the first and second foamed resin molding materials obtain a foamed resin molded product that is fused only in the gap formed in the partition member at the boundary surface .
[0014]
[Action]
In the invention according to any one of claims 1 to 8, the first foamed resin molding material filled in the first space formed in the cavity and the second foamed resin molding material filled in the second space. Are in contact with each other in a gap formed in a partition member attached to a boundary portion of the first and second spaces in the cavity.
Thereby, when the first and second foamed resin molding materials are heated and expanded, the first and second foamed resin molding materials that are in contact with each other in the gap formed in the partition member are fused to each other. Can do.
Therefore, since the first and second foamed resin molding materials are fused only in the gap formed in the partition member at the boundary surface, the first and second foamed resin molding materials at the boundary surface rather than the one where the entire boundary surface is fused. In addition, the bonding strength of the second foamed resin molding material can be reduced.
That is, since the foamed resin molded product molded by the foamed resin molding machine can be folded at the boundary surface with a smaller force than the one where the entire boundary surface is fused, one is processed with a small volume. can do.
The strength at the boundary surface can be adjusted by changing the size and number of the gaps.
[0015]
In particular, when the foamed resin molded product is used as a cushioning material when packing a predetermined article as in the invention described in claim 2, the partition member is removed from the center of gravity of the predetermined article. By attaching to a location, the first and second foamed resin molding materials can be fused at that location.
Therefore, by fusing the first and second foamed resin molding materials at a location deviating from the center of gravity of the predetermined article, the fusion strength at the location can be reduced.
That is, by not providing the fused portion of the first and second foamed resin molding materials at the portion of the foamed resin molded product where the center of gravity of the predetermined article is applied, the foamed resin is caused by the load of the predetermined article. It is possible to prevent the molded product from being damaged.
[0016]
According to a third aspect of the present invention, a step is formed on the partition member, and the gap is formed on a predetermined surface of the step, so that the step is not formed. The strength of the fused portion of the first and second foamed resin molding materials can be increased.
That is, for example, as described in the embodiment of the invention described later, when the foamed resin molded product is used as a cushioning material, the number of steps is changed according to the weight of the product to be packed. Thus, the strength of the fused part can be adjusted.
[0017]
Further, as in the invention described in claim 4, when the first and second foamed resin molding materials are granular, the gap formed in the partition member is formed with the first and second foamed resins. Preventing the other foamed resin molding material from moving into the space filled with the one foamed resin molding material by forming the molding material to be smaller than one particle size and larger than the other particle size. it can.
That is, since the first and second foamed resin molding materials can be prevented from being mixed, the strength of the portion molded by each of the first and second foamed resin molding materials can be accurately set.
[0018]
Further, as in the fifth aspect of the invention, the first and second foamed resin molding materials are of the same type and made of materials having different foaming magnifications, that is, the same type of material. However, by using materials having different foaming ratios, the portions molded by the first and second foamed resin molding materials can have different strengths.
That is, for example, as described in the embodiments of the invention described later, when packing a product having a biased center of gravity, such as a television in which a large portion of the load is applied to the bottom surface of the outer frame of the CRT, When using as a cushioning material, the part where the center of gravity is applied is molded with a foamed resin molding material with a low foaming ratio, and the part where the center of gravity is not applied is molded with a foamed resin molding material with a high foaming ratio. It is possible to mold a foamed resin molded product that can increase the resistance. In this case, it is possible to easily fold the cushioning material at the fused portion in the post-use process by fusing the foamed resin molding materials having different foaming ratios at the portion off the portion where the center of gravity of the product is applied. it can.
[0019]
Further, the foamed resin molded product having a balanced strength can be obtained by using different types of materials as the first and second foamed resin molding materials as in the invention described in claim 6. realizable.
In other words, for example, the part where the center of gravity of the product is applied is molded with a foamed resin molding material having a high strength when heated and expanded, and the part where the center of gravity is not applied is foamed with a material whose strength is low when heated and expanded. Molded with resin molding material.
[0020]
Further, the foamed resin molded product having a balanced strength is a different kind as the first and second foamed resin molding materials and has different foaming ratios as in the invention described in claim 7. It can also be realized by using a material.
That is, for example, a portion where the center of gravity of the product is applied and a portion where the center of gravity is not applied can be molded to a desired strength by changing the material of the foamed resin molding material and the expansion ratio.
[0021]
Furthermore, as in the invention according to claim 8, the size of the gap or the number of the gaps is provided by detachably attaching the partition member so as to partition the first and second spaces in the cavity. Can be changed to different partition members.
That is, by changing the specifications of the partition member, the strength of the joint portion of the first and second foamed resin molding materials can be changed according to, for example, the weight of the product to be packed.
[0022]
According to a ninth aspect of the present invention, the first and second foamed resin molding materials are fused by being heated and expanded while the partition member is mounted in the cavity, and the partition member is formed on the partition member. A heating and expanding step of fusing the first and second foamed resin molding materials in contact with each other in the formed gap.
Therefore, the first and second foamed resin molding materials that are in contact with each other in the gap formed in the partition member can be fused to each other.
That is, since the first and second foamed resin molding materials are fused only in the gap formed in the partitioning member at the boundary surface, the first and second foamed resin molding materials at the boundary surface rather than the one where the entire boundary surface is fused. In addition, the bonding strength of the second foamed resin molding material can be reduced.
As a result, the foamed resin molded product molded by the foamed resin molding machine can be folded with a smaller force at the boundary surface than the one where the entire boundary surface is fused. Can be processed.
[0023]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of a foamed resin molding machine and a method for producing a foamed resin molded product of the present invention will be described with reference to FIGS. 1 to 3.
FIG. 1 is a cross-sectional explanatory view illustrating a mold provided in the foamed resin molding machine according to the present embodiment, in a closed state, and FIG. 2 is a partition member when FIG. 1 is a front view. It is a top view which takes out and shows 50. FIG. FIG. 3 (A) is an explanatory view showing the appearance of the foam molded product molded by the mold shown in FIG. 1, and FIG. 3 (B) is a cross-sectional view taken along the line AA in FIG. is there.
[0024]
In this embodiment, the foamed resin molded product to be molded is used as a cushioning material interposed between the left and right edges of the bottom of the TV and the inner surface of the cardboard box when the TV is packed in a cardboard box. Will be explained as a representative. FIG. 3A is an explanatory view of the cushioning member for supporting the left side edge of the bottom as seen from the front of the television as seen from the right side.
[0025]
As shown in FIG. 1, the mold 10 includes a fixed-side master frame 20, and the fixed-side master frame 20 includes a fixed-side mold 22 and a back plate 24. Further, the mold 10 is provided with a moving master frame 30 that is joined to the fixed master frame 20 so as to face each other. The moving master frame 30 includes a moving mold 32 and a back plate 34. Is provided.
The moving-side master frame 30 performs mold closing and mold opening by moving in a direction indicated by arrows F1 and F2 in the drawing by a piston cylinder mechanism (not shown) attached to the back plate 34.
[0026]
A cavity 60 in the shape of a foam molded product 80 is formed between the fixed side mold 22 and the moving side mold 32, and the cavity 60 is separated from the first space 61 and the second space by the partition member 50. The space 62 is divided. The partition member 50 is detachably attached to the moving side mold 32. The fixed mold 22, a raw material supply pipe 42, 44 through the back plate 24 are through, the raw material supply pipe 42, the first space 61, the raw material supply pipe 44, the second space 62 To communicate with each other.
[0027]
That is, the raw material supply pipe 42 is filled with the first foamed resin beads 71 as the first foamed resin molding material in the first space 61 by a filling machine (not shown), and the raw material supply pipe 44 is filled with the above filling machine. The second foamed resin beads 72, which are the second foamed resin molding material, are filled in the second space 62.
In this embodiment, expanded polystyrene beads are used as the first and second expanded resin beads, the expansion ratio of the first expanded resin beads is 50 times, and the expansion ratio of the second expanded resin beads is 40. Is double.
[0028]
Next, the structure of the partition member 50 will be described with reference to FIG.
In FIG. 2, the right side of the partition member 50 is the side that is attached to the moving side mold 32, and the left side is the side that faces the fixed side mold 22.
As shown in FIG. 2, the partition member 50 is formed with an attachment member 54 attached to the moving-side mold 32, and a slit is formed at the upper end of the attachment member 54 on the inner side surface of the molded product. The slit forming member 53a is formed. Further, a slit forming member 53b for forming a slit on the inner side of the bottom surface of the molded product is formed at the lower end of the mounting member 54. A plurality of comb teeth 51 are formed on the attachment member 54, and a gap 52 formed between the comb teeth 51 is formed to have a length L1. The length L1 is smaller than the diameter of the first foamed resin bead 71 and larger than the diameter of the second foamed resin bead 72. Further, the gap 52 is open in the mold closing direction.
That is, the partition member 50 prevents the first foamed resin beads 71 filled in the first space 61 of the cavity 60 from flowing out into the second space 62. Further, the partition member 50 makes the second foamed resin beads 72 filled in the second space 62 come into contact with the first foamed resin beads 71 by projecting from the gap 52 to the first space 61.
[0029]
Next, a method of molding a foam molded product using the first foamed resin beads 71 and the second foamed resin beads 72 will be described with reference to FIGS.
FIG. 4 is a process diagram showing a molding process.
First, as shown in FIG. 1, the moving-side master frame 30 is moved in the direction indicated by the arrow F2 to perform mold closing (step 100). Subsequently, the first foamed resin beads 71 are filled into the first space 61 of the cavity 60, and the second foamed resin beads 72 are filled into the second space 62 of the cavity 60 (step 200). At this time, as described above, the partition member 50 prevents the first foamed resin beads 71 from passing through the partition member 50 and flowing into the second space 62. Further, as described above, the filled second foamed resin beads 72 protrude from the gap 52 of the partition member 50 into the first space 61 and come into contact with the first foamed resin beads 71.
[0030]
Subsequently, heated steam flows from a steam inflow hole (not shown) formed in the stationary mold 22 and the moving mold 32, and the first foamed resin beads 71 and the second foamed resin beads 72 are heated and expanded. And fusing (step 300). At this time, the second foamed resin bead 72 protruding from the gap 52 of the partition member 50 and in contact with the first foamed resin bead 71 is fused with the first foamed resin bead 71 at the contacted portion. [0031]
Subsequently, cooling water is sprayed from injection holes (not shown) formed in the stationary mold 22 and the movable mold 32 to cool the inside of the cavity 60, and the foamed molded product in the cavity 60 is solidified (step 400). . Subsequently, the moving-side master frame 30 is moved in the direction of the arrow F1 to open the mold (step 500), and the foam molded product in the cavity 60 is taken out (step 600).
[0032]
Here, the structure of the foam-molded product molded by the above process will be described with reference to FIG.
As shown in FIG. 3 (A), the foam molded product 80 includes a first molded part 81 molded by the first foamed resin beads 71 and a second molded model molded by the second foamed resin beads 72. A side slit 83 formed by the slit forming member 53a of the partition member 50, and a slit forming member at the joint 85 between the first molding portion 81 and the second molding portion 82. A bottom slit 84 formed by 53b is formed. The cross-sectional shape of the joint portion 85, that is, the shape of the fused portion between the first molding portion 81 and the second molding portion 82 is a vertically long rectangular shape on the side surface, as shown by hatching in FIG. It has a shape having a fused part 82a and a comb-like fused part 82b on the bottom surface.
That is, since the first foamed resin beads 71 and the second foamed resin beads 72 are fused to each other only in the gap 52 of the partition member 50, the cross-sectional shape of the fused portion 82b indicates the fused portion. It has a comb-like shape in which convex portions 82c and concave portions 82d indicating non-fused portions are alternately formed.
[0033]
Accordingly, since the first molding portion 81 and the second molding portion 82 have a smaller area to be fused than the conventional one that is fused to the entire surface of the boundary portion as in the prior art, the bonding at the boundary portion is performed. The strength can be reduced.
That is, when the foam molded product 80 is processed after use, it can be folded at the joint portion 85 by applying a small force, so that one volume can be reduced.
Moreover, most of the load of the television, because it takes the support surface 82a of the second molded section 82 shown in FIG. 3 (A), the first molded portion 81 hardly Kakekara, bonding strength of the joint 85 Even if it is small, the effect as a buffer member is not reduced.
[0034]
Moreover, as a partition member, as shown to FIG. 5 (A), the step part 56 is formed, The thing of the shape by which the comb teeth 57a and 57b were formed in the two surfaces can also be used. By using the partition member 55, the foam molded product 90 shown in FIG. 5B can be molded. Comb-shaped joint portions 91a and 91b formed by comb teeth 57a and 57b are formed on the step portion 91 of the foam molded product 90.
Thereby, the foam molded product 90 has a high strength against an external force acting in the direction indicated by the arrow F3 and a low strength against an external force acting in the direction indicated by the arrow F4.
[0035]
That is, the foamed molded product 90 has high strength against the load of the product when used as a cushioning material, and after use, it can be easily folded from the corner 92 by applying a small force in the directions of the arrows F5 and F6. Will be able to.
In addition, the intensity | strength with respect to the external force of the arrow F3 direction can be raised by making the height of a step part low, or increasing the number of step parts.
[0036]
Moreover, in the said embodiment, although the expanded styrene bead was used as a 1st and 2nd expanded resin bead, the bead which combined polyethylene and the foaming agent can also be used. Further, different materials can be used as the first and second foamed resin beads, and materials having different materials and expansion ratios can be used.
In other words, by changing the material and the expansion ratio, it is possible to mold a foam molded product optimal for the application. In this case, as a matter of course, it is possible to mold one according to the application by changing the number and size of the gaps of the partition member.
[0037]
【The invention's effect】
As described above, according to the present invention, it is possible to realize a foamed resin molding machine and a method for producing a foamed resin molded product that can improve the ease of processing after use of the molded foam molded product.
[Brief description of the drawings]
FIG. 1 is a cross-sectional explanatory view of a mold provided in a foamed resin molding machine according to an embodiment of the present invention.
FIG. 2 is a plan view showing a partition member provided in the mold shown in FIG.
3A is an explanatory view showing an appearance of a foam molded product molded by the mold shown in FIG. 1, and FIG. 3B is a cross-sectional view taken along the line AA in FIG.
FIG. 4 is a process diagram showing a molding process according to an embodiment of the present invention.
5A is a plan view showing a modification of the partition member, and FIG. 5B is a cross-sectional view of a foam molded product molded using the partition member shown in FIG. 5A.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 Mold 20 Fixed side master frame 30 Moving side master frames 42 and 44 Raw material supply pipes 50 and 55 Partition member 51 Comb tooth 52 Gap 56 Step part 60 Cavity 61 1st space 62 2nd space 71 1st foamed resin Bead 72 Second foamed resin bead 80 Foam molded product 82a, 82b Fusing part 83, 84 Slit 85 Joint part

Claims (9)

In a foam resin molding machine that fills a foam resin molding material in a cavity inside a mold and heats and expands the filled foam resin molding material to mold a foam resin molding product,
A plurality of spaces are formed in the cavity,
A first space in which the plurality of spaces are filled with a first foamed resin molding material;
Together adjacent to the first space, and between the plurality of air is provided and a second space in which the second foamed resin molding material is filled,
The first foamed resin molding material filled in the first space and the second space filled in the second space are attached to the boundary portion of the first and second spaces in the cavity. 2 is provided with a partition member formed with a gap where the foamed resin molding materials are in contact with each other ;
When the first and second foamed resin molding materials are heated and expanded, the first and second foamed resin molding materials that are in contact with each other only in the gap formed in the partition member are fused to each other. A foamed resin molding machine characterized in that it is made to perform. The foamed resin molded product is used as a cushioning material when packing a predetermined article,
2. The partition member according to claim 1, wherein when the foamed resin molded product is used as a cushioning material for the predetermined article, the partition member is attached to a location that is out of the center of gravity of the predetermined article. Foam resin molding machine.   The foamed resin molding machine according to claim 1 or 2, wherein a step portion is formed on the partition member, and the gap is formed on a predetermined surface of the step portion. The first and second foamed resin molding materials are granular,
The clearance gap formed in the said partition member is below the one particle size of the said 1st and 2nd foaming resin molding material, and is larger than the other particle size, The Claim 1 thru | or 3 characterized by the above-mentioned. The foamed resin molding machine as described in any one of these.   The foamed resin molding according to any one of claims 1 to 4, wherein the first and second foamed resin molding materials are of the same type and are made of materials having different foaming ratios. Machine.   The foamed resin molding machine according to any one of claims 1 to 5, wherein the first and second foamed resin molding materials are made of different kinds of materials.   The foamed resin molding according to any one of claims 1 to 6, wherein the first and second foamed resin molding materials are of different types and are made of materials having different foaming ratios. Machine.   The foamed resin according to any one of claims 1 to 7, wherein the partition member is detachably attached to a boundary portion between the first and second spaces in the cavity. Molding machine. In the method for producing a foamed resin molded product, the foamed resin molded material is filled in a cavity inside the mold, and the filled foamed resin molded material is heated and expanded to mold a foamed resin molded product .
Forming a first space in which the cavity is filled with the first foamed resin molding material, and a second space adjacent to the first space and filled with the second foamed resin molding material;
The first foamed resin molding material filled in the first space and the second foamed resin filled in the second space at the boundary between the first and second spaces in the cavity Attach a partition member with a gap to allow the molding materials to contact each other,
A material filling step of filling the first space with the first foamed resin molding material and filling the second space with the second foamed resin molding material;
While the partition member is mounted in the cavity, the first and second foamed resin molding materials are fused by being heated and expanded, and the first and the mutual contact are made in a gap formed in the partition member. And a thermal expansion step of fusing the second foamed resin molding material,
A mold release step of releasing the foamed resin molded body in the cavity fused by the heating expansion process ,
A method for producing a foamed resin molded product, comprising: obtaining a foamed resin molded product in which the first and second foamed resin molded materials are fused only in a gap formed in the partition member at a boundary surface thereof .

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