JPS60224515A - Injection molding apparatus - Google Patents

Abstract

PURPOSE:To obtain a molded product formed of molding materials different in color or quality at the same cycle by a single mold, by forming a plurality of inflow ports to the single mold and respectively connecting a plurality of hoppers to said inflow ports while providing an opening and closing means for opening and closing a flow route. CONSTITUTION:A flow route 14 is closed by a bushing 20 to be divided into upper and lower sections and, when molding materials different in color tone or quality are respectively injected into a mold 10 in this state from sprue nozzles 18a, 18b of both hoppers 17a, 17b, the molding material from one hopper 17a is injected into the upper part of the flow route 14 from an inflow port 15a through an inflow path 16a to be injected in the mold hole 13 communicated with said route 14 while the molding material from the other hopper 17a is injected into the lower part of the flow route 14 from an inflow port 15b through an inflow path 16b to be injected in the mold hole 13 communicated with said route 14 and molded products 24a, 24b different in color tone or quality are completed simultaneously. By this method, the molded products different in color tone or quality can be obtained at the same cycle using the single mold.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an injection molding apparatus for injection molding a plurality of resin molded products having the same or similar shapes, and particularly relates to the case of obtaining molded products of different colors or different materials. .

[Prior art]

Conventionally, an injection molding apparatus for injection molding multiple molded products with a single mold has a structure as shown in Fig. 1, and a fixed side mold (
1) and a movable side mold (2) that collides with the molding die (3), a plurality of holes for molded products having the same or similar shape are carved and formed, and each mold A molding material flow path (4) called a spool runner is connected to the hole, and a molding material inlet (5) is provided on the front surface of the stationary mold (1), which is connected to the inflow path (6).
), and the spool nozzle (8) at the tip of the injection molding raw material hopper (7) is connected to the inlet (5) via the gate reinforcing plate (9). .

The raw material segment of the molding material once stored in the hopper (7) is heated by a heating device (not shown) and becomes a viscous fluid, which is then transferred to the piston cylinder or screw cylinder machine @y (from the spool nozzle) in the hopper (7). (8) into the mold (3), and is transferred into each mold cavity through the inflow path (6) and the distribution path (4), whereby a molded product with a desired shape is obtained in each mold cavity. .

By the way, in the molded product obtained as described above,
In some cases, it is necessary to mold a molded product of a different color tone or material for an arbitrary number of multiple molds, but in all cases like this, conventionally, molding materials of one color tone or material are required in advance. After securing the desired quantity of molded products, Matoko pulls out only the pigment and the colored material from the molding machine, and then extracts the colored material from the molding machine. This is injection molded with other dyed material segments.

However, in the above-mentioned case, the stop time of the molding apparatus required for material exchange is extremely long, increasing the ineffective time of the molding operation, and resulting in a significant decrease in molding efficiency.

[Purpose of the invention]

This invention was made with the above points in mind,
The purpose is to obtain molded products made of different colored or different molding materials using a single mold and in the same cycle.

[Structure of the Invention] The present invention provides a single mold provided with a plurality of mold holes for molded products, and a plurality of inlets for flowing molding material into a molding material distribution path communicating with each of the mold holes. A plurality of hoppers each spouting a different color or different type of molding material are connected to each of the inlets, and an opening/closing means for opening and closing the distribution path is provided in the distribution path. This is an injection molding machine.

〔Effect of the invention〕

Therefore, according to the injection molding apparatus of the present invention, molding materials of different colors or different types are injected from the nozzles of each of the plurality of hoppers while the flow path in the single mold is closed by the opening/closing means. Molded products with different colors or materials in each mold cavity can be obtained using a single mold and in the same cycle, which eliminates the need for material replacement and significantly reduces the time required for wasted molding. The molding efficiency can be improved. Furthermore, if the flow path is opened by the opening/closing means and the molding material is injected only by a single hoverer,
As with the conventional method, molded products of the same color tone and material can be obtained.

〔Example〕

Next, this invention will be explained in detail with reference to the drawings from FIG. 2 onwards showing embodiments thereof.

First, FIGS. 2 to 4 showing the first embodiment will be explained.

In these drawings, θO is the stationary mold θU and the movable mold 0 that is integrally attached to the mold (11).
2, 03 is a plurality of holes for molded products of the same shape and similar shape that become a pool formed by engraving in the mold 0*, 0→ is inside the mold OI (15a) is a linear molding material distribution path in the vertical direction formed in the mold cavity 03 and communicated with each mold cavity 03, respectively.

(15b) are molding material inlets formed at the upper and lower front surfaces of the stationary mold 01) and communicated with the upper and lower parts of the distribution path 04) through the inflow passages (16a) and (16b), respectively;
17a) and (17b) are two hoppers that eject different colored or different molding materials from respective spool nozzles (18a) and (18b), each hopper (17a),
The spool nozzles (18a) and (18b) of (17b) are connected to the respective inlets (15a) and (15b) of the mold 00 via gate reinforcing plates (19a) and (19I), respectively.

The fence is rotatably provided at the center of the circulation path 04) in the mold 00, that is, at a position corresponding to approximately the middle of both inflow ports (15a) and (5b), and opens and closes to divide the circulation path 04) into upper and lower parts. It is a bushing that serves as a means, and is composed of a cylindrical body. A communicating path 01) that communicates between the upper and lower parts of the circulation path θ4) is transparently provided at a position offset from the center of the bushing (A), and the bushing (1) The circulation path 04 is opened and closed according to the rotation. (A) is a bolt for fixing the bushing holder, and includes a semicircular groove (A) formed in the mold () and a semicircular groove (2 (IX)) formed on the outer periphery of the bushing (1).

(20y) and fit the bolt (c) into this to prevent the bushing rod from rotating.

The semicircular grooves (20x) and (20y) of this bushing holder each block the flow path 04) with the bushing (a).

It is formed at a position that matches the semicircular groove (C) of the mold 01 when it is opened, and the bushing rod is fixed when the flow path (+41) is opened and closed.

Then, as shown in FIGS. 2 and 3, the distribution path 04) is blocked by a bushing and divided into L below, and both hoppers (17a), (171)) are connected to
/ When molding materials of different colors or materials are injected into the mold 00 from the hoppers (18a) and (18b), the molding materials from one hopper (17a) flow into the inlet (15a).
), the molding material from the other hopper (17a) is injected into the upper part of the distribution path 04) through the inflow path (16a), and is further injected into the mold hole 03 communicating with this, and the molding material from the other hopper (17a) is injected into the upper part of the distribution path 04). 15b) through the inflow path (16b) to the lower part of the distribution path 04), and is injected into the mold cavity 03 communicating with this, forming molded products (2) with different colors or materials.
4a) and (24b) are completed at the same time.

Further, as shown in FIG. 4, while the bushing (1) is rotated to open the communication path 01) [and the distribution path 04), one hopper (17a) is stopped, and
Spool nozzle (181) of the other hopper (17b)
) When the molding material is ejected from the inflow path (16b)
The molding material is injected through the flow path 04) into all mold cavities 03 to obtain a molded product (24b) having the same color tone and material.

In addition, when one hopper (1
Even when only 7a) is used, a molded product (24a) having the same color tone and material can be obtained.

Therefore, according to the above embodiment, it is possible to obtain two types of molded products (24a) and (24b) with different colors or materials using the same mold 00 and in the same cycle, and it is possible to obtain two types of molded products (24a) and (24b) with different colors or materials, which eliminates the need for replacing molding materials as in the conventional method. This eliminates the hassle of
It is possible to improve molding efficiency. In addition, distribution route 0
Since the mold 00 can be opened as necessary, the mold 00 can be conveniently used even when molded products having the same color tone and material are obtained.

Next, other embodiments will be described in detail with reference to the drawings from FIG. 5 onwards.

In these drawings, the same symbols as above indicate the same or corresponding parts, and the difference is that the mold 00 is provided with a rotatable moving bushing (c) to which one hopper (17a) is connected. This is the point. That is, in the upper part of the mold OI, there are two parallel communication paths (26x) that can freely communicate with the circulation path 04, respectively.

A cylindrical bushing (A) in which (26y) is formed is rotatably provided, and a molding material inflow port that communicates with one communication path (26X) via a flow path (16a) on the front surface of the bushing (C). (15a) and connect the spool nozzle (18a) of one hopper (17a) to the inlet (
15a) K-connected, and the hopper (17a) is movable with the rotation of the bushing (c).

Note that (A) is a bolt for fixing the bushing, and as shown in Figure 5, the semicircular groove (28X) of the bushing (C)
By fitting the bolt (B) into the semi-circular part of the mold 0*, the bushing (C) is fixed with one communication path (26X) communicating with the flow path 011), as shown in Fig. 6. As shown in the figure, by fitting the bolt ■ into the semicircular groove (28y) of the bushing (c) and the semicircular groove of eel 01,
The bushing (c) connects the other communication path (26y) to the circulation path (14)! It is fixed in the state where L is connected.

Therefore, as shown in FIG.
6x) is connected to the distribution path 04), molded products (24a
L (24+)) is obtained at the same time, and as shown in Fig. 6, the communication path (+4) of the bushing (A) is opened from the communication path @+) VC, and the moving bushing (C) is connected to the pumper. By rotating 180 degrees with (17a) and communicating the other communication path (26y) with the distribution path 04), a molded product (24+)) with the same color tone or material produced only by the hopper (171)) is produced. It is possible to obtain the same effect as in Section 011.

Although the above description deals with the case where two types of molded products (24a) and (24b) with different colors or materials are obtained, the present invention is not limited to this. At the same time, by providing two or more opening/closing means in the flow path in the mold, it is possible to obtain molded products of three or more different colors and materials in a single mold and in the same cycle.

[Brief explanation of the drawing]

FIG. 1 is a partially cutaway side view of a conventional injection molding device, and FIG. 2 and subsequent drawings show embodiments of the injection molding device of the present invention.
2 to 4 show one embodiment, FIG. 2 is a partially cutaway side view, FIGS. 3 and 4 are partially removed front views, and FIGS. 5 and 6 are views of other embodiments. It is a front view with a part removed of an example. 01・Molding mold, 0 [Yes]・Mold hole, 0Xun・・Distribution route,
(17a), (17b) -t '7' par, (18
a), (18b) - Spool nozzle, 0I bushing. Agent Ryuta Fujita on patent attorney basis

Claims (1)

[Claims] ■ A single mold with multiple mold holes for molded products is provided with multiple inlets that allow the molding material to flow into the molding material distribution path that communicates with each of the mold holes. An injection molding apparatus characterized in that a plurality of hoppers for ejecting materials are respectively connected to each of the inlets, and an opening/closing means for opening and closing the distribution path is provided in the distribution path.