JPH02255306A - Synthetic resin foaming mold - Google Patents

Abstract

PURPOSE:To reduce the labor, time and cost for making mold to a large extent and, in addition, reduce the storage space of molds by a structure, wherein a mold, which comes into contact with the exterior bottom face of a molded body, and a mold, which at least comes into contact with the exterior side faces, interior bottom face, interior side faces and interior top face, are provided. CONSTITUTION:A cavity 7, which has a shape corresponding to that of a molded item 2 or a box type packaging container having partition walls 1, is formed by a flat mold 3 and a projected mold 6. The flat mold 3 produces the exterior bottom face of the molded item 2 and is flat. On the other hand, the protruded mold 6 has a shape corresponding to the inside projections and recesses of the molded item 2 including the surfaces of the partition walls 1 and also has wall surfaces, which produce the exterior side faces of the molded item 4. When the molded item 2 is required to be charged to the one having no partition wall 1, the protruded mold 6 is modified to the one without portions corresponding to the partition walls 1 and the flat mold 3 can be used as it is.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a mold for synthetic resin foam molding, which is used to manufacture and utilize packaging containers, cushioning materials, etc., for example.

[Prior Art J] Conventionally, a mold for synthetic resin foam molding is comprised of a concave mold having a wall surface for molding the external side surface of a molded object, and a convex mold having a wall surface for molding the inside of the molded object.

For example, when manufacturing a molded body 2 of a box-shaped packaging container having a partition wall l as shown in FIG. It has a wall surface 5 that literally has a concave shape. Further, the convex mold 6 has a shape corresponding to the irregularities inside the molded body 2 including the surface of the partition wall l.

[Problem to be Solved by the Invention 1] However, in the conventional mold described above, both the concave mold 12 and the convex mold 6 have to be manufactured for each desired molded object 2 according to its shape, and there are many types. In addition, remanufacturing both the concave mold 12 and the convex mold 6 for each molded body whose shape is frequently changed is a great burden in terms of labor, time, and cost.

[Means (and effects) for solving the problem 1 The means taken to solve the above problem will be explained with reference to FIG. 1, which corresponds to an embodiment of the present invention. A synthetic resin foam molding mold comprising a flat mold 3 in contact with an external bottom surface and a convex mold 6 which also has a wall surface 5 forming an external side surface 4 of a molded body 2.

The present invention was made by focusing on the fact that most molded bodies 2 manufactured by synthetic resin foam molding have flat external bottom surfaces, and the convex mold 6 molds the external side surface 4 of the molded body 2. The fact that the molded body 2 also has a wall surface 5 serves to limit the surface that was conventionally molded by the concave mold 12 to the outer bottom surface of the molded body 2. As a result, the conventional concave mold 12 can be changed to a flat mold 3 having no unevenness, and the flat mold 3 can be used commonly for various types of molded bodies 2.

[Example] FIG. 1 is a sectional view of a mold according to an example of the present invention, which is a mold for molding a molded body 2 shown in FIG. 2.

As is clear from FIGS. 1 and 2, the flat mold 3 and the convex mold 6 form a cavity 7 having a shape corresponding to the shape of the molded body 2, which is a box-shaped packaging container having a partition wall 1. .

The flat mold 3 is used to mold the outer bottom surface of the molded body 2 and is flat. Further, the convex mold 6 has a shape corresponding to the unevenness on the inside of the molded body 2 including the surface of the partition wall 1, and also has a wall surface 5 that forms the outer side surface of the molded body 4.

According to the present mold, for example, when making a change to eliminate the partition wall 1 of the molded body 2, if the concave mold 6 is remanufactured without a part corresponding to the partition wall 1, the flat mold 3 can be used as is. can do.

FIG. 3 shows an example of applied use of the mold according to the present invention. The flat mold 3 and the convex mold 6 themselves are the same as those in FIG. 1, but a plate-shaped spacer is placed in the center of the flat mold 3. 8 is installed. When this mold is used, as shown in Figure 4,
Molded body 2 in which the bottom part 9 is slightly raised and leg parts 10 are provided
It can be done.

FIG. 5 shows another example of the application of the mold according to the present invention. As in the case of FIG. 3, the flat mold 3 and convex mold 6 themselves are the same as those in FIG. A rectangular annular spacer 8 is attached to surround the flat mold 3. When this mold is used, as shown in FIG. 6, the bottom part 9 has a notch 11 around it, and the bottom part 9 is fitted into the upper opening through the notch 11, thereby stabilizing the mold. The molded body 2 can be stacked together.

[Effects of the Invention] The present invention is as explained above, and since the flat mold 3 can be used in common for various molded objects 2, the effort, time, and cost for manufacturing molds are significantly reduced. This also has the effect of saving storage space for molds.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing one embodiment of the present invention, and FIG.
FIG. 3 is a sectional view showing an example of applied use of the mold according to the present invention, and FIG. 4 is a perspective view of a molded product molded by the mold shown in FIG. FIG. 5 is a cross-sectional view showing another example of application, and FIG. 6 is a cross-sectional view showing a part of the molded body formed by the mold shown in FIG. 5. FIG. 7 is a sectional view showing a conventional mold. 2: Molded body, 3: Flat mold, 4: External side surface of the molded body 5: Wall surface forming the external side surface of the molded body.

Claims (1)

[Claims] (1) A mold for molding a synthetic resin foam molded product having at least an external bottom surface, an external side surface, an external top surface, an internal bottom surface, an internal side surface, and an internal top surface, the mold being in contact with the external bottom surface of the molded product. A synthetic resin foam molding mold having at least an external side surface, an external top surface, an internal bottom surface, an internal side surface, and a mold in contact with the internal top surface.