JPH06362B2 - Injection blow molding machine - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to an injection blow molding machine that can also be used as an injection molding machine.

(Prior Art) Conventionally, when a plastic container is injection blow-molded, a dedicated injection blow-molding machine is used regardless of whether it is mass-produced or medium / small-volume.

(Problems to be solved by the invention) However, since the injection blow molding machine is a special molding machine and the mold used is complicated, molding for small volume production in terms of price, delivery time, maintenance, etc. Not suitable for goods. Also,
Since it is a dedicated machine, it cannot be used as a general-purpose injection molding machine, and if an injection molding machine is required, an injection molding machine must be installed separately from the injection blow molding machine. I could not avoid the inconvenience of being unsuitable for goods.

(Means for Solving the Problems) In the injection blow molding machine of the present invention, an injection cavity mold mounted on the fixed side mounting plate and a core mold mounted on the movable side mounting plate are provided such that they can be opened and closed on the same axis. At the same time, the core mold attached to the movable side mounting plate is provided with a blow split mold that can be opened and closed facing in a direction perpendicular to the axis connecting the injection cavity mold and the core mold. Therefore, injection molding or injection blow molding can be appropriately selected and performed by the same molding machine.

(Embodiment) An embodiment in which the present invention is applied to a single vertical injection molding machine will be described with reference to the drawings.

In the figure, reference numeral 1 denotes a fixed side mounting plate, on which an injection cavity die 2 is mounted via a cavity block 3 and a location ring 4 is provided.

Reference numeral 5 denotes a movable side mounting plate, on which a core mold 8 having a core mold base end side portion penetrating the core seat 6 and prevented from being pulled out by a nut 7 is mounted via a core block 9. At the same time, a neck mold 10 (screw mold in the embodiment) that faces the core mold 8 side of the core seat 6 is provided via an ejector plate 11 as described later.

The movable side mounting plate 5 is arranged to face the fixed side mounting plate 1 such that the injection cavity mold 2 and the core mold 8 can be opened and closed on the same axis by a mold clamping device (not shown).
In order to position the molds 2 and 8 when the molds are opened and closed, the cavity block 3 and the edge plate 11 are provided with guide pins 12 and guide holes 13 which can be fitted to each other.

On the edge plate 11, a molding machine side edge rod 14 is connected via a die side edge rod 15, and a guide pin 17 that fits into a guide hole 16 provided in the core block 9 is mounted. For this reason, the edge plate 11 is formed on the molding machine side.
Thus, the core block 9 is opened and closed in parallel.

The net mold 10 is mounted on the edge plate 11 so as to be openable and closable by slide pressers 18 on both sides. This network mold 10 has a core block 9
Angular pin 2 that fits into the angular hole 19 provided in the
0 is provided. For this reason
When 1 is pushed up to the injection side, the net mold 10 is opened and slid by the angle pin 20. Ejection of the molded product is performed by utilizing these movements.

Reference numeral 21 denotes a net-type opening prevention block, which is mounted on the core block 9 so as to be engaged with the net type 10 and held in the closed position unless the edge plate 11 is pushed up.
As a result, it is possible to prevent the neck mold 10 from opening at the time of mold opening after the completion of injection, so that it is possible to avoid a problem that the parison after molding is separated from the core seat 6 due to molding shrinkage. Also,
Since it is possible to prevent the neck mold 10 from opening in the blow molding process, it is possible to avoid the problem that the neck portion (screw portion) of the molded product is deformed.

Reference numeral 22 is a blow split mold, which is slidably mounted on the edge plate 11 by slide bases 23 on both sides, and is arranged so as to face the axis connecting the injection cavity mold 2 and the core mold 8 at a right angle. There is. The slide base 23 is fixed to the core block 9.

Reference numeral 24 is a cylinder, which is mounted on a cylinder mounting plate 23 ′ provided at the end of the slide base 23, and which is attached to the suction split mold 2
It is connected to 2.

25 is an air blowing gap between the core seat 6 and the core mold 8,
It communicates with the air passage 26 provided in the core seat 6 and the core block 9.

The injection cavity mold 2 and the core mold 8 can control the temperature suitable for molding by passing the temperature control medium through the temperature control medium passages 27 and 28. The temperature of other necessary parts can be controlled according to the molded product.

Although an example of single-piece production has been described, a plurality of injection cavity dies, core dies and blow split dies and a hot runner may be provided as necessary to obtain a multi-piece production. Further, although an example of vertical injection molding has been described, the same effect can be obtained as horizontal injection molding.

(Operation) The molding process will be described with reference to FIGS.

(1) Injection process (refer to FIG. 6) After the blow split mold 22 is opened, the core mold 8, the neck mold 10, etc. are moved to the fixed side mounting plate 1 side and clamped by the mold clamping position. When the molten resin is injected with a plasticizer, the molten resin is injected into the cavity mold 2 and the core mold 8.
And between the neck mold 10 and the core seat 6, and the parison P is molded.

(2) Blowing process (see Fig. 7) When the mold is opened by the mold clamping device, the parison P becomes the net mold 1.
It is gripped between 0 and the core seat 6 and is released from the injection cavity mold 2 while being in close contact with the core mold 8.

The blow split mold 22 is driven by the cylinder 24 at the illustrated mold open position.
After closing, the air is blown into the parison P from the gap 25 between the core seat 6 and the core mold 8 through the air passage 26 by an air source (not shown), and the parison P is divided into the neck mold 10 and the core seat 6. While being held in between, it is released from the core mold 8 and swells up to the blow split mold 22, and a molded product W having an accurate neck portion is molded.

(3) Discharging process (see FIG. 8) After the blow split mold 22 is opened by the cylinder 24 and the edge ejector plate 11 is pushed up by the edge ejector rod 14 on the molding machine side, the neck die 10 moves to the fixed side mounting plate 1 side. Then, it comes off from the core block 9 and angiyurapin 20
Opened by. Therefore, the molded product W is discharged from the core mold 8 by the edge ejector plate 11.

(4) When the edge plate 11 is returned to the original core block 9, the net mold 10 is closed by the anguilura pin 20. In this state, the injection process is performed and the molding cycle continues.

(Effects of the Invention) As described above, the present invention has a simple configuration in which a general injection molding machine is equipped with an injection blow molding die. Therefore, injection blow molding can be performed by extremely simple modification of the injection molding machine, The same molding machine can be used as an injection molding machine by exchanging a general injection molding mold with the above mold. Therefore, it is possible to significantly reduce the facility cost, improve the maintainability, and improve the molding operation rate, and it is possible to sufficiently deal with the molded products of injection blow molding in the medium and small volume.

[Brief description of drawings]

1, 2, and 3 are a plan view showing an embodiment of the present invention, a front view of a partial cross section taken along the line AA, a right side view, and a fourth view.
The figure is a front view of a cross section taken along line BB, FIG. 5 is a side cross sectional view taken along line C, and FIGS. 6, 7, and 8 are front views showing an injection process, a blowing process, and a discharging process. Is. P ... Parison, W ... Molded product, 1 ... Fixed side mounting plate, 2 ... Injection cavity mold, 5 ... Movable side mounting plate, 6 ... Core seat, 8
… Core mold, 10… Neck type, 11… Egykta plate, 14,15… Egyketal rod, 20… Angiyura pin, 21… Neck type opening prevention block, 22… Blow split type, 24… Cylinder, 25… For air blowing gap.

Claims (1)

[Claims] 1. An injection cavity mold mounted on a fixed side mounting plate and a core mold mounted on a movable side mounting plate are provided so as to be openable and closable on the same axis, and the core mold mounted on the movable side mounting plate is provided. An injection blow molding machine characterized in that a blow split mold facing the axis connecting the injection cavity mold and the core mold in a direction perpendicular to the axis is openably and closably provided.