JPS59182716A - Molding of synthetic resin hollow product with insert part - Google Patents

Abstract

PURPOSE:To mold a complicated shape profitably and to obtain the titled product capable of advancing to a new field by a method wherein a support device for an insert is provided under a parison drawing port and an insert is molded on the upper part of split molds. CONSTITUTION:To take an example, a fitting part 6 is provided and a jig for fixing and supporting an insert 3 is hinged 7 inside a drawing port 5. Then, the parison a is drawn out of the drawing port 5 of a head 1 and hung down until the lower end of the parison reaches the lower ends of the split molds 4, 4', the split molds 4, 4' are closed to each other, air is injected from a spray nozzle 12 for blow-molding to obtain the desired product holding an insert 3 on the top.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a molding method for synthetic resin blow-molded products with insert parts.The purpose of this invention is to provide a support mechanism for the insert parts under the parison outlet, and to provide a support mechanism for the insert parts under the parison outlet. In addition to making insert molding possible for products with complex shapes, it is now possible to perform insert molding on products with complex shapes, and by adding the conventional insert molding on the lower part, it is possible to simultaneously mold insert parts on the upper and lower parts of M products. make it possible,
Our aim is to make it possible for synthetic resin hollow products to enter new fields.

It is known that in conventional hollow molding, all parts such as caps, screws, pipes, etc. are insert molded, but the technology to support all of these insert parts at the top of the split mold has not been developed. , the insert part supported by a vertically movable support member such as a mandrill 13 is guided to the lower part of the opening/closing split mold, and the insert part is opened and closed at the point where the upper half of the insert part is covered with a hanging parison. Insert molding is performed by completely closing the split mold.0 This type of insert molding is used, for example, to create a gas vent that branches from one end of the bent main rib of an automobile gasoline tank. However, the gas venting hole of the main pipe part (when insert molding all the mouthpiece parts of the inlet on the eve branch side, the mouthpiece parts to be inserted are supported and placed under the openable split mold, so the gas vent of the openable split mold) Naturally, the branching part of the tube should be provided at the bottom, so the lower end of the parison to be fed out tends to be thicker, so the branching part should be made thicker and the inner diameter narrowed to act as a gas vent. There is a risk that it will disappear.

The present invention is designed to avoid such problems.
A detailed description of the embodiment drawings will be given below.The drawings will be described in detail.
For installation, a hole 6 is provided inside the insert part 6, and a jig 2 for fixing and supporting the insert part 6 is fully screwed 7. The jig 2 has a fixing groove 8 for the insert part 3 on the lower surface, and a magnet 9 is attached to the upper surface of the fixing groove 8, or a thread 10 is provided on the circumferential surface of the fixing groove 8, and the insert part 6? It is fitted and magnetically attached, and the screw-shaped insert part 6 is screwed and attached.

Also, a moving mechanism 11 that moves back and forth between the bottom of the head 1 and the rear of the molding machine? Install the jig 2 to the mechanism 11 and place it inside the feeding port 5. Note that 4 and 4' are open/close type, and the upper part pr (birching line) is at a constant interval. Then, the parison a is completely fed out from the feeding opening 5 of the head 1, and stopped at point 7j where the lower end reaches below the split molds 4 and 4', and the split mold is 4, 4'*Close, air from air blow nozzle 12? After injection and hollow molding, insert part 3
A hollow product is obtained in which the material is held in the upper part. When the insert part 5 is magnetically attached to the jig 2, the product can be taken out immediately by opening the split molds 4, 4', but when the insert part 5 is attached with screws, it can be taken out by turning the product and scraping the screw alloy. Take it out.

′! In addition, when the insert part 3 is supported by the moving mechanism 11, in order to provide a forward and backward passage for the moving mechanism 11, a part of the first feeding port 5 is closed and the insert part 3 is placed in the shape shown in FIG.
Alternatively, a plate-shaped molten material is separately placed and molded.

17) In this way, insert molding is possible at the top of the open/close split mold, so the insert mold for the gasoline tank mentioned above can also be molded with all the branch parts placed at the top, unlike conventional molds. As a result, the risk of the branching part becoming thick and losing its gas venting function is eliminated.

In addition, by using the entire lower insert molding,
Now that it is possible to mold a product having insert parts 6 in two places, upper and lower, it is possible to obtain a hollow molded product that can be jointed, for example, on both the upper and lower sides, and this has the effect of making it possible to enter new fields.

[Brief explanation of the drawing]

Fig. 1 is a partial longitudinal sectional front view showing the insert part in a magnetically attached state before molding, Fig. WJ2 is a partial longitudinal sectional front view showing an example of screw insertion, and Fig. 3 is the same, an example supported by a moving mechanism. Fig. 4 is a side view, Fig. 5 is a plan view of the same example, Fig. 6 is an example of upper and lower inserts. 7 is a perspective view showing an example of molding an injection robot vibrator, 1 is a head 12, a jig, 6 is an insert part, and 4, 4' are open/close split molds. Patent applicant Hiroharu Araki

Claims (1)

[Claims] To install a jig 2 under the head 1 for parison feeding, or to install a jig 2 that moves under the head 1, the insert parts 3 are fully supported by these jigs 2, and the opening/closing split molds 4, 4' are A method for molding a synthetic resin hollow product with an insert part, characterized by insert molding the upper part.