JPS58194521A - Injection orientation blow molder - Google Patents

Abstract

PURPOSE:To make the heat treatment easy, by a method wherein a heat-treating metal mold and a heating air blow core are arranged between the orientation blow molder station and the unloading station in the injection orientation blow molder intermittently rotating, and the heat treatment of blow moldings is carried out in succession to the orientation injection blow molding. CONSTITUTION:A bottomed parison is molded in an injection molding station A and the bottomed parison is transferred to a temperature regulation station B by holding in a neck-mold. Thereafter, it is transferred to the orientation blow station C and orientatively blow-molded to the blow moldings 15. Then, the blow molding 15 is held in the neck-mold and transferred to the inside of heat-treating mold of the secondary processing station D. High temperature air is blown into the blow molding 15 with the heating air blow core 19 and pressurized, and the heat-treatment is carried out by keeping the condition of adhesion to the cavity for a fixed time. Thus, the heat treatment can be easily carried out.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an injection stretch blow molding machine that is capable of heat-treating a hollow molded product in succession to stretch blow molding. Molded products have better transparency and strength than hollow molded products made by blow molding, and are becoming widely used as containers for various contents, including beverage bottles.

Furthermore, with the expansion of applications, there is a demand for improvements in not only the strength of blow molded products but also their thermal stability.

Although there is a problem with heat resistance in particular, polyethylene terephthalate bottles, which are used as containers for carbonated beverages, have excellent gas barrier properties. Because it can also be used as a container, heat treatment is sometimes used to impart heat resistance.

This heat treatment is performed using other equipment after the hollow molded product is taken out, which tends to result in poor production efficiency and high costs due to the need for manpower. Therefore, it is desired to develop a molding machine that does not particularly increase the product cost even when heat treatment is performed.

This invention was made in view of the above-mentioned circumstances.
We aim to provide a new injection stretch blow molding machine that can automatically and continuously carry out the process from injection molding of IJson to taking out the heat-treated hollow molded product, and that can also perform the heat treatment under constant pressure. It is something to do.

The present invention for the above-mentioned purpose is to provide a molding machine that continuously performs processes from injection molding of a bottomed e-lison to taking out a stretch-blow-molded hollow molded product by one revolution of an intermittent rotating rotary disk. A secondary processing station is provided for heat-treating, and using a heat treatment mold disposed in this secondary processing station and air pressure from a heated air blowing core,
It is characterized by a structure that allows the hollow molded product to be heat treated before being taken out of the machine.

The present invention will be explained in detail below using illustrated examples.

In the figure, (1) is a board provided above a machine stand (2) at a required interval, and a drive device (3) is fixed to the center of the top surface. This drive device (3) is for intermittently rotating a horizontal rotary disk (4) provided close to the lower side of the board +1).
It is a commercially available type that operates electrically or hydraulically, and the drive shaft (5) is connected to the rotary disk (4) via a transmission means.

There are also 5 neck shapes (6) around the bottom of the rotary disk (4).
The springs (7) (attached by applying force, each neck type f6) 16) are spaced at a certain interval and can be freely opened and closed in the radial direction. A (A), temperature adjustment station (B),
There are five operating stations: stretch blow molding station (0), secondary forming station (to), and take-out station (g). Although omitted, a number of holes f8)' (8a) are drilled on the board in this part to guide the various cores and mold opening members operated by the existing lifting device downward.

Further, the injection molding station is provided with an injection device (9), an injection mold and a mold clamping device, and the temperature adjustment station (B) is provided with a temperature adjustment pot that can be raised and lowered. -! , stretch blowing station (C)
A blow mold (10) and its hydraulic opening/closing device (J l) (l l) are provided in the radial direction.

As shown in Fig. 2, the blow molding mold 00) consists of a pair of split molds that sandwich and close a neck mold (6), and a bottom mold (10a) that can be raised and lowered. The neck mold (6) that holds the mold at the center of the mold is inserted with the blowing core 03) which has passed through the holes (8) (8a) of the substrate (1) and the rotary disk (4) and has descended from above the substrate. Its blown core Q
The bottomed ♀lison o2 is stretched in the axial direction by the stretching rod θa inserted in 3), and expanded by the compressed air from the blowing core o3) to form a hollow molded product (+5).

Next, the secondary processing station (2) has a heat treatment mold (
16) and its hydraulic opening/closing device o7) are provided in the radial direction. The cavity of the heat treatment mold (16) is the third
As shown in the figure, it consists of a pair of split molds having the same cavity as the blow molding mold 00) and equipped with a heating medium passage (181), a bottom mold (16a), and a neck mold (6). It has a structure that holds the hollow molded product (15) held and transferred together with the neck mold (6).
6) has holes (8J (8a
), a heated air blowing core 0→ is inserted, and high temperature air is blown into the hollow molded product (151) from the blowing core QLjj, thereby molding the hollow molded product (151 together with the heat treatment mold (16)). It is designed to be heat treated.

In the above molding machine, the rotary disk (4) rotates counterclockwise by 72 degrees. This intermittent rotation can be easily achieved by using various commonly used devices, so the details thereof will be omitted. First, at the injection molding station (5), the bottomed Z9 IJ The bottomed parison a2 is held in the neck mold (6) and transferred to the temperature adjustment station (B), and after temperature adjustment, it is transferred to the stretch blow molding station (Q) where it is molded as shown above. After closing, the hollow molded product 05) is stretch blow molded.

Next, the hollow molded product 0 [with] is held in the neck mold (6), transferred to the center of the heat treatment mold (161) in the open state of the secondary processing station (6), and further closed. It is held in a heat treatment mold (16) that is heated to a required temperature.A heated air-blown core α is then inserted into the neck mold (6), and a high-temperature core is inserted into the hollow molded product (15). Air is blown in and pressurized, and the heat treatment is performed while maintaining close contact with the cavity for a certain period of time.

Hollow molded product (151) heat-treated as described above
After opening the mold, it is transferred to the ejection station (G),
By opening the neck mold (6), a heat-resistant hollow molded product is taken out of the machine and used as a container for fruit juice, etc.

As mentioned above, this invention provides a stretch blow molding station (
A secondary processing station (C) is provided between 0 and the take-out station (C), and the hollow molded product (15) stretch-blown at this operation station can be immediately heat-treated at the next operation station. As such, there is no need to perform heat treatment on other equipment. In addition, since the hollow molded product can be placed in the same cavity as the mold used for molding and heat treated while applying internal pressure, there is less deformation, less loss due to heat treatment, and it can be carried out automatically in one molding machine. The molding machine itself has the advantage that by simply adding one operation station, the other operation stations can be used as they are, and the structure is not particularly complicated. It has characteristics.

[Brief explanation of drawings]

The drawings show one embodiment of the injection stretch blow molding machine according to the present invention, and FIG. 1 is a plan view, FIG. 2 is a longitudinal sectional view of the stretch blow molding station, and FIG. 3 is a view of the secondary processing station. FIG. 1... Board, 2... Machine base, 3...
Drive device, 4...Rotary disk, 6...Neck mold, 9...Injection device, 10...Blow molding mold, 12...Bottomed/E IJ son, 13
... Blowing core, 14...-Stretching rod 1.
15...Blow molded product, 16...Heat treatment mold, 18...Heated air blowing core, 19...Heat medium passage, A...Injection molding station, B...Temperature Adjustment station, C... Stretch blow molding station, D... Secondary processing station 1. (E... Retrieval station.

Claims (1)

[Claims] In an injection stretch blow molding machine, each operation station required for taking out a stretch blow molded hollow molded product from a bottomed injection molding machine is arranged in sequence at a stop position of a neck type attached to a rotating member that rotates intermittently. , a secondary processing station for the hollow molded product is provided at the neck mold stop position between the stretch blow molding station and the take-out station, and this secondary processing station has the same structure as the blow molding mold of the stretch blow molding station. An injection stretch blow molding machine is equipped with a heat treatment mold and a heated air blowing core, and is capable of heat treating a hollow molded product continuously after stretch blow molding.