JPS62211115A - Molding process of handle molded out of plastic - Google Patents

Abstract

PURPOSE:To mold an easily usable plastic handle with rich body by a method in which the front portion and the rear portion of a handle are twice molded, and the front portion is molded, while inserting the inserting pin for a metallic handle rod, and then after the inserting pin has been pulled out, the rear portion is molded, while inserting the metallic handle rod. CONSTITUTION:The front portion 10 of a plastic handle (a) is first injection molded, while setting an inserting pin 11 into a mold (c). After this inserting pin 11 has been pulled out from this molded front portion 10, the metallic handle rod 13 of a product (b) is inserted into the handle rod inserting hole 12 made by this inserting pin 11 at the state where it protrudes to opposite side. Another molded (d) is used for the front portion 10 attached to this metallic handle rod 13, and residual rear portion 14 is injection molded integrally therewith, while using this metallic handle rod 13 as a plastic core.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention is applicable to Western tableware such as spoons and forks, ladles,
This invention relates to a method for molding plastic handles used for cooking utensils such as frying turnsters.

[Conventional technology]

Plastic handles molded from thermoplastic plastic, which can be mass-produced, are often used for various handles such as Western tableware and cooking utensils.

Conventionally, this injection molding method is called insert molding, in which a metal handle rod 3 of a product 2 is directly inserted into a mold 1 as shown in FIG. 1, and plastic is injected in this state to mold a plastic handle 4. This is the way to do it.

This molding method requires the use of a highly accurate mold 1, and also requires high precision for the metal handle 3. Otherwise, a gap 5 will be created between the mold 1 and the metal handle 3, and from this gap 5. There were also drawbacks such as leakage of plastic, which prevented superior injection molding, and leakage of plastic, which turned into particles, required post-processing, which hindered mass production.

Further, although it is possible to make a highly accurate mold, the cost of the mold becomes high.Although it is possible to similarly obtain high precision on the product 2 side, there is a drawback that the cost is high.

In addition, not only insert molded products but also plastic molded products have the disadvantage that the products look cheap because they are lightweight.

[Problem that the invention seeks to solve]

The present invention solves this problem, and instead of molding the plastic handle in one step, the front part of the handle and the remaining rear part are divided into at least two parts, and when the front part is molded, the metal handle is molded. A rod insertion pin is inserted and molded, and after molding, the insertion pin is removed from the front part, a metal handle rod is inserted into the handle insertion hole, and this metal handle rod is used as the core of the plastic handle on the back side. This is a method in which the plastic handle is molded into a predetermined shape by integrally molding the front part with the front part, making it possible to mold the plastic handle without using a high-precision mold. It is a technical problem to provide a method for molding a plastic handle that is easy to use and has a feeling of weight similar to a metal handle by being embedded in the plastic handle.

[Means for solving problems]

When injection molding the thermoplastic handle a,
The insertion pin 11 is set in the mold C, and the front part 10 of the plastic handle a is first injection molded with the insertion pin 11 inserted, and after the insertion pin 11 is pulled out from the molded front part 10. Insert the metal rod 13 of the product into the rod insertion hole formed by the insertion pin 11 with the metal rod 13 protruding to the opposite side, and insert the front part 10 with the metal rod 13 into the metal rod 13 that was used above. Using a mold d different from the mold C, the metal handle rod 13 is used as a plastic core and the remaining rear part 14 is integrally injection molded with the front part 10 to form a plastic handle a of a predetermined shape.

〔Example〕

In Figures 2 to 7, insert the plastic handle a into the front part 1.
0 and the rear part 14 into two, and the front part 10
This figure shows a so-called two-color plastic handle in which the plastic parts of the rear part 14 and the rear part 14 have different colors.

As shown in FIG. 8, by extending the metal handle rod 13 and molding it in three steps, it is possible to mold the plastic handle a in three or four colors.

As shown in FIG. 9, the front part 10 and the rear part 14 are integrally molded on the left and right sides.

It is preferable to form a communication hole, a notch, etc. in this metal handle rod 13 so that the plastic can be firmly attached.

〔Effect of the invention〕

Since the present invention is constructed as described above, it has the following features.

l Do not mold the plastic handle a in one step, but divide at least the front part 10 and the remaining rear part 14 of the handle into two parts, and when molding this front part 10, use the metal fixed in advance to the mold C. The insertion pin 11 for the handle rod is inserted and molded, and after the insertion pin 11 is removed from the front part 10, the metal handle rod 13 is inserted into the handle insertion hole n.
The metal handle rod 13 is used as the core of the plastic handle, and the remaining rear part 14 is integrally molded with the front part 10 to form the plastic handle a, so a highly accurate mold c-d must be used. The plastic handle a can be molded without any problems.

In this case, the insertion pin 11 is set in the mold C in advance, and if the insertion pin 11 is finished and placed with high precision, there will be no gap between it and the mold C, allowing for highly accurate molding. There is no need for post-processing as there is no formation of cracks on the top.

2 The metal handle rod 13 inserted into the front part 10 is used as a plastic core, and the remaining rear part 14 is integrally molded with the front part 10, so this metal handle rod 13 connects the front part 1.
0 and the rear part 14 can be integrated to form a durable plastic handle a, and since the rear part 14 is molded later, a two-color plastic handle a with the front part 10 and the rear part 14 in different colors is completed. .

3. Furthermore, by making the metal handle rod 13 longer so that it is located at the back of the rear part 14, it is possible to make a high-quality plastic handle a that has a heavy feel.

[Brief explanation of drawings]

Figure 1 is a front cross-sectional view of a conventional mold, Figure 2 is a front cross-sectional view of a mold for molding the front part of the present invention, Figure 3 is a slope view of the front part, and Figure 4 is a metal handle rod in the front part. Fig. 5 is a front cross-sectional view of molding the plastic handle, Fig. 6 is a perspective view with the plastic handle inserted.
The figure is a perspective view of the finished product, FIG. 7 is a front sectional view thereof, and FIGS. 8 and 9 are front views of the abraded plastic handle. a..Plastic handle, b..Product, C.d..
Mold, 10...front part, 11...insertion pin, minor...handle insertion hole, 13...metal handle lever, 14...rear part. y

Claims (1)

[Scope of Claims] 1. When injection molding a thermoplastic plastic handle, an insertion pin is set in the mold, the front part of the plastic handle is first injection molded with the insertion pin inserted, and this molding is performed. After removing the insertion pin from the front side part, insert the metal handle rod of the product into the handle insertion hole formed by the insertion pin with the metal handle stick protruding to the opposite side, and then remove the front side with the metal handle rod. Using a different mold from the one used above, the metal handle rod is used as a plastic core and the remaining rear part is integrally injection molded onto this front part to form a plastic handle of a predetermined shape. A molding method for plastic molded handles featuring: 2. The method for molding a plastic handle according to claim 1, wherein the rear part is made of plastic of a different color from the front part to mold a two-color plastic handle.