JPS5952632A - Production of synthetic resin stamp member - Google Patents

Abstract

PURPOSE:To make a container not bulky, by a method wherein connectedly molded main bodies of bases are fitted in cavities defined by a fixed metallic mold and a movable metallic mold, and then a soft synthetic resin stamp member is molded on each of the main bodies while a portion of the resin is charged into slip-off preventing parts. CONSTITUTION:The first fixed metallic mold 8 and the first movable metallic mold 11 are set to form the cavities for the main bodies 3 of the bases. A hard synthetic resin is injected into a resin-introducing part 14 as indicated by an arrow (a), whereby it is charged under pressure into each cavity through each runner 14a. Then, each of the main bodies 3 is placed in each recessed part 17 of the second fixed metallic mold 16, and the second movable metallic mold 18 is set onto the mold 16, whereby the cavities 20 for stamp members 4 are formed. Then, a soft synthetic resin is injected into a resin-introducing part 21 as indicated by an arrow (b) by an injection molding machine, whereby it is charged under pressure into each of the cavities 20 through each runner 21a.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing an upper resin stamp piece, and more particularly, to a method for manufacturing an upper resin stamp piece, in particular, a base body and a stamp member on which characters, symbols, figures, etc. are formed are integrally bonded together. This invention relates to a method for mass-manufacturing using injection molding.

Traditionally, commemorative stamps and New Year's stamps used at tourist spots around the country have a base body with a sunburst part layered with a design or other □ on the bottom, and a base body that is integrated with this base body. It consists of a protruding handle part,
When molding such a stamp, for example, the base body having the handle portion and the stamp portion are molded separately, and then the two parts are glued or otherwise overlapped.

However, while this method requires a lot of man-hours and effort,
Since the handle portion is provided on the base body, the stamp as a whole has a large volume, resulting in high cost. In particular, stamps for toys are a set of multiple stamps with various designs, for example, 2 to 40 stamps, forming a motif for some kind of play or education. It was difficult to say that it was desirable to apply a stamp having a handle portion as it was to the field of toys. This is because the unit price per stamp is extremely high, and it is not possible to store and transport a large number of stamps with various designs in a shallow container.

In applying stamps to the field of toys, the present invention takes into account the drawbacks of stamps with handles as described above, and is very inexpensive, does not take up much bulk when transported, and can be used in combination with a plurality of stamps. To obtain a method for producing a large amount of flat stamp pieces made of synthetic resin that can constitute a motif for play or educational purposes.

That is, the gist of the present invention is that, as shown in FIG. 1, various patterns a, b,
To mass-produce a plurality of flat stamp pieces A, B, (, D, F) made of synthetic resin, each of which is formed with c, d, e, f and connected by a thin gate l or film connecting part 2. As shown in Figs. 1 and 2, these stamp pieces have a base body 3 made of hard plastic and a stamp piece whose area is somewhat smaller than this pace body 3. The base main body 3 has a semicircular engagement groove 5 formed at the center of both ends thereof to engage with a pair of engagement claws of a toy handle member (not shown). .5, and a release stop portion 6.6 for preventing the plurality of stamp members 4 formed near the center from separating from the base body 3, as shown in FIG. 2 in this embodiment. An annular through hole having a step part in the middle is formed in the hole.

By the way, synthetic resin species %1 and 17 generally include thermoplastic synthetic resins such as polyethylene, polypropylene, polyvinyl chloride, and mixtures thereof, phenolic resins,
There are thermosetting resins such as urea resins, melamine resins, mixtures and copolymers of these resins, and the synthetic resins used in the present invention include those made of hard plastics, such as hard plastics. The materials used for dolls, seesaw dolls, merry-go-rounds, etc., and the materials used for soft plastics, for example, inflatable vinyl toys made from sheets such as floats, are selected as appropriate. In addition, the injection molding machine to be used is appropriately selected depending on the resin used, such as a screw in-line type injection molding machine (type 4 machine, transfer molding machine, torpedo type injection molding machine, ram type injection molding machine).

Hereinafter, the present invention will be explained in detail with reference to embodiments shown in the drawings.

In the embodiment shown in FIGS. 3 to 6, 7 is a step of molding a plurality of base bodies 3 shown in FIG. 1 connected through a gate 1 made of hard plastic. That is, 8
is a first fixed mold, and this first fixed mold has a base body 3.
A plurality of recesses 9 are formed for molding the upper side of. Reference numeral 10 denotes an annular protrusion for a release stop that protrudes from a position close to the center of these recesses, and this annular protrusion 10 has a large diameter portion connected to the surface of the recess 9 as shown in FIG. and a small diameter part which is further connected to the large diameter part. 1
1 is a first movable mold in which a plurality of recesses 12 corresponding to the recesses 9 of the first fixed mold 8 are formed;
1 is pressed against the first fixed mold 8 and set, a gate connecting the cavity for each pace body 3 and each stamp piece A, B, C, D, E, F shown in FIG. Part 1
3 and a film connection (not shown in FIG. 3) are formed, respectively.

14 indicates a resin introduction part from an injection molding machine, not shown;
This resin introducing portion 14 is provided with runners 14a that communicate with the cavities for the respective pace bodies 3, as shown by arrows. Although not shown in FIG. 3, each base body 3 shown in FIGS. 1 and 2 is attached to the first movable mold 11.
A protrusion is provided for forming an engagement groove 5.5.

Next, 15 is a step of fixedly attaching a plurality of stamp members 4 made of soft plastic shown in FIGS. 1 and 2 to each base body 3 formed in step 7 so as not to be removed. be. That is, reference numeral 16 denotes a second fixed mold in which a recess 17 is formed for accommodating a plurality of molded base bodies 3, and this second fixed mold 16 is substantially the same as the first fixed mold. However, the only difference from the first fixed mold 8 is that each recess 17 is not provided with a circumferential protrusion for a release stop. Reference numeral 18 denotes a second movable mold in which recesses 19 are formed at positions corresponding to the recesses 17 of the second fixed mold, and the second movable mold 18 is pressed against the second fixed mold 16 and set. Then, cavities for each stamp member 4 shown in FIGS. 1 and 2 are formed. Reference numeral 21 denotes a resin introduction part from an injection molding machine (not shown), and this resin introduction part 21 is provided with a runner 21a communicating with a cavity addition for each of the K stamp members 4, as shown by arrows.

In the above configuration, the first fixed mold 8 and the first movable mold 1
1 as shown in FIG. 3 to form a cavity for each pace body 3. Thereafter, an appropriately selected hard synthetic resin is injected from arrow A into the resin introducing section 14.

The injected synthetic resin is injected under pressure into each cavity from each runner 14a. A portion of the synthetic resin injected under pressure at this time also fills the gate portion and the film connection portion (not shown). The hard synthetic resin filled in the first movable mold 11 and the first fixed mold 8 in this way is then cooled and taken out from the molds, but the molded product member taken out from the molds is 1 and 2, a mutually gated or thin film connecting portion 2 of a thickness of, for example, 0.1 mm is shown in FIGS.
The pace main bodies 3 are connected to each other via 7.

Next, each base body 3, which is a molding member, is mounted in each recess 17 of the second fixed mold 16, as shown in FIG. Thereafter, when the second movable mold 18 is set in the second fixed mold 16, cavities for each stamp member 4 are formed. Then, the selected soft synthetic resin is suitably injected into the resin introducing portion 21 from the arrow port using an injection molding machine (not shown).

The injected synthetic resin is injected under pressure into each cavity from each runner 21a. At this time, a part of the synthetic resin injected under pressure is also filled in the plurality of release stop parts 6 of each base body 3, and in this way, the second movable mold 18 and the second fixed mold When the soft synthetic resin filled in the mold 16 is cooled and taken out from the mold, each base body 3 and the stamp member 4 are fixedly removed through the removal stop part 6, as shown in FIG. At the same time, they are connected to each other via the gate 1 and the film connecting portion 2 to reach a temperature of 0.degree. C. (see FIG. 1). 'With the method of the present invention, as shown in FIGS. 1 and 5]! a plurality of stamp pieces A connected together;
B1. By forcibly bending C11), E, and F as shown in FIG. 6, the gate 1 and the film connecting portion 2 are cut.

In this embodiment, the stamp piece is square and has a hollow shape, but the shape of the stamp piece is not limited to the square shape. Furthermore, when removing the base body 3, the release stop portion is formed in an annular through hole having a stepped portion. A through hole or the like may be formed.

As is clear from the above description, in the present invention, a plurality of flat stamp pieces A, B, C, D, B connected to each other can be produced without requiring man-hours or effort unlike the conventional method. , F can be obtained at once, so the unit price per stamp piece becomes extremely low. In addition, the multiple stamp pieces are thin (and connected by a gate and film connection part, so they can be easily cut. Also, unlike conventional stamp pieces, the stamp pieces are flat and do not have a handle, so they can be easily transported). A large amount can be stored in a container with a shallow bottom. Therefore, the container does not take up much bulk.Furthermore, since the stamp pieces can be made very small, each stamp piece can be decorated with various designs and multiple pieces can be made. It is possible to obtain a toy or educational stamp piece that constitutes a kind of play or educational activity, and in addition, a stamp piece that can be exchangeably supported by a pair of engaging claws of the handle member (not shown) is obtained. be able to.

[Brief explanation of drawings]

FIG. 1 is a plan view of an embodiment of a stamp piece obtained by the present invention. 2 is a sectional view taken along line 11-1M in FIG. 1, FIG. 3 is an explanatory diagram of the molding of the base body of the present invention, FIG. 4 is an explanatory diagram of the molding of attaching the stamp member to the pace body of the present invention, and FIG. The figure is a side view of a stamp piece obtained by the present invention, and FIG. 6 is an explanatory view of the state in which the gate of the present invention is cut. l...Gate, 2...Film connection part, A to F...Stamp piece, 3
...Base body, 4...Stamp member, 5...Engagement groove, 6...Removal stop part, 8...・First fixed mold, 9.12.1
7.19... Concavity, 10... Annular protrusion, 11... First movable mold, 13...
...Gate part, 14.21...Resin introduction part,
16...Second fixed mold, 18...
Second movable mold, addition...cavidy. Patent Applicant: Showa Kasei Ltd. Agent: Patent Attorney: Mitsutaka Miura Iall Figure 5 Figure 6

Claims (1)

[Claims] 1) Set the first fixed mold and the first movable mold to mold a plurality of base bodies made of hard synthetic resin having a removal prevention part and connected through gates. two[
Then, after installing these connected and molded base bodies into the 2nd fixed mold and the 2nd movable mold, a part of the above-mentioned extraction is filled into the escape prevention part 1 and placed in each base body. Synthetic tree Jl)r'' =・Yu... Method for manufacturing buchi.