JPS62128708A - Mold apparatus for molding preform - Google Patents

Abstract

PURPOSE:To make it possible to open and close molds without moving a cavity mold and a transfer plate up and down by setting elastically a holding plate on the transfer plate with supporting axes and spring part materials to move the holding plate up and down against the cavity mold by means of a core mold. CONSTITUTION:When a core mold 13 is moved to the direction for closing the mold, the core mold 13 reaches from hole parts 4, 5 to a holding mold 12 and the surface of the mold 15 of the extreme top is located in the holding mold 12 and the step part 16 is contacted to the upper surface of the holding mold 12. At this moment, pressing axes 17 moved down with the core mold 13 contacts with a mold setting plate 9 and pushes the holding mold 12 down together with the core mold 13 through the mold setting plate 9 to a cavity mold 6. Closing the cavity mold 6, the holding mold 12 and the core mold 13 together are thereby carried out. When the core mold 13 is elevated, the holding mold 12 also returns to the lower surface of a transfer plate 3 by means of the spring pressure while being contacted with the step part 16 of the extreme top of the core mold. In this case, as the open circumference edge of the preform 20 is being pinched between the surface of the core mold 14 and the mold surface of the holding mold 12, the preform is separated from the cavity mold 6 and moved to the transfer plate side accompanied by the holding mold 12.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a mold device for molding a preform used for blow molding synthetic resin containers.

(Prior art) A molding machine that continuously performs injection molding of preforms and blow molding of containers such as bottles is the Tokko Shosa 3-2, ? 0?6
It is already publicly known from the publication No.

(Problems to be Solved by the Invention) In the preform molding mold device of this known molding machine, the cavity mold is moved up and down relative to the neck mold on the lower side of the upper base above the machine stand to open and close the mold. Because we are doing
The nozzle of the injection device must be separated when the mold is opened, which tends to lengthen the injection molding cycle. Also, depending on the resin, stringiness or leakage may occur in the nozzle.

Therefore, attempts have been made to fix the cavity mold on the machine base and move the neck mold side up and down6, but in this case, the neck mold must be moved up and down together with the transfer plate, so other Not only does the device become complicated due to the connection with the operating section, but new problems arise, such as the need to rotate the transfer plate immediately after opening the mold and transfer the preform together with the neck mold to the next operating section. ing.

(Means for Solving the Problems) This invention was devised to solve the problems of the prior art described above, and its purpose is to eliminate the need to move the cavity mold and the transfer plate up and down. An object of the present invention is to provide a new preform mold device that can open and close the mold by vertically moving a holding mold that also serves as a mold around the opening of the preform.

The invention according to the above object fixes a cavity mold together with a hot runner mold on a machine stand, and includes a holding mold for molding the outer periphery of the opening of the f IJ form above the cavity mold.
A core mold that is attached to the lower surface of the transfer board below the upper base plate, penetrates through holes drilled in the upper base board and the transfer board, and is fitted with the above-mentioned holding mold is arranged above the upper base board. The holding mold is elastically mounted on the transfer plate using a support shaft and a spring member so that the holding mold can be moved up and down with respect to the cavity mold by the core mold.

(Function) In the above structure, after the transfer plate is stopped and the holding mold is positioned above the cavity mold, when the core mold is lowered through the hole, the mold surface at the tip of the core mold is first moved inside the holding mold. The periphery of the tip is in contact with the holding mold, and the holding mold is lowered together with the core mold against the spring member until it comes into contact with the cavity mold, thereby closing the mold.

Further, when the core mold is raised, the holding mold also returns to its original position by the spring member while remaining in contact with the core mold, and the mold opens there. At this time, the injection-molded preform is released from the cavity mold while being held between the holding mold and the core mold, and is conveyed as it is to the transfer plate side together with the holding mold.

Further, the present invention will be specifically explained with reference to illustrated embodiments.

(Example) In the figure, 1 is the machine base, 2 is the upper base installed above the machine base,
A transfer plate 3 is rotatably attached to the lower side.

Although the overall structure of the molding machine is omitted in the drawing, the upper base is fixed to multiple supports around the machine base, and the transfer plate 3 is rotated intermittently at 90° angles by a rotating device installed in the center of the upper base 2. It is designed to rotate and move.

The upper base plate 2 and the transfer plate 3 have holes 4 and 5 of a required diameter drilled on all sides, which overlap each other at the stop position. Each device is arranged as an operation section for molding, temperature control, stretch blow molding, and mold release.

FIG. 1 shows a longitudinal section of the preform molding apparatus, in which a cavity mold 6 for molding the bottom outer surface of the preform is fixed together with a hot runner mold 7 to the machine base l. Further, on the lower surface of the transfer plate 3, a required number of support shafts 8 are provided perpendicularly protruding from the member 10 in pairs, with holes 5 in between. It is a freely movable penetrating type.

A spring member 11 is provided between the mold placement plate 9 and the flange 8a at the lower end of the support shaft, and the mold placement plate 9 is constantly urged toward the transfer plate by the spring pressure.

Reference numeral 12 denotes a holding mold that forms the outer periphery of the opening of the f reform, and is mounted on the mold placement plate 9 and set in a position where it closes with the cavity mold 6 directly below the hole 5. Although not shown in the drawings, the holding mold 12 is a split mold that opens and closes laterally together with the mold placement plate 9.

A core mold that molds the inner surface of the 13 Huff'lJ form.
It is connected to the member 14 at the tip of the piston of a mold clamping cylinder (not shown) provided on the upper part of the column of the upper base 2, and its end surface forms a mold surface 15 that forms a cavity together with the cavity mold 6 and the holding mold 12. , and its type face 15
The upper periphery of the holding mold 12 is formed with a stepped portion 16 and comes into contact with the upper surface of the holding mold 12 .

Further, on both sides of the core mold of the member 14, a suppressing shaft 17 is attached which passes through holes bored on both sides of the hole portions 4 and 50 and comes into contact with the mold placement plate 9. Note that 18 is a guide pin.

Therefore, in the above structure, when the transfer plate 3 is in a stopped state and the holes 4 and 5 overlap, when the core mold 13 is moved in the cell-closing direction together with the member 14 by the mold clamping cylinder, the core mold 13 reaches the holding mold 12 through the holes 4 and 5, and the mold surface 15 at the tip is located inside the holding mold 12,
The stepped portion 16 is in contact with the upper surface of the holding mold 12 via the holding mold I2.
is lowered to cavity mold 6.

As a result, the cavity mold 6, the holding mold 12, and the core mold 13 are formed.
The mold is closed to form a cavity for the flat noriform.

After closing the mold, apply mold clamping force to the hot runner mold 7.
Molten resin is injected into the cavity from the injection device 19 whose nozzle is constantly in contact with the dart, and a flat preform 2 is formed.
0, when the core mold 13 is raised, the holding mold 12 also returns to the lower surface of the transfer plate 3 due to the spring pressure while remaining in contact with the stepped portion 16 at the tip of the core mold. At this time, Noriform 2
From the point where the opening periphery of No. 0 is held between the core mold surface 14 and the mold surface of the holding mold 12, the cavity mold 6 is also released and transferred to the transfer plate side together with the holding mold 12. Furthermore, after the mold placement plate 9 comes into contact with the lower surface of the transfer plate, the core mold 13 is removed from the holding mold 12 and returned to its original position above the upper base plate 2. As a result, the preform addition remains in the holding mold 12, as shown by the chain line in FIG.

The preform is transferred as it is to the next operation section by rotation of the transfer plate 3 together with the holding mold 12.

FIG. 4 shows a longitudinal section of the temperature control operation section. This operation section includes a temperature control pot 22 which is connected to a cylinder device 21 provided on the machine base 1 and arranged so as to be able to rise and fall freely, and a temperature control pot 22 which is arranged on the upper base 2. There is a temperature control core field disposed at the center which can be raised and lowered, and the temperature can be controlled by sandwiching the Noriform 20 together with the holding mold 12.

After the temperature is adjusted, the glyph-ohm is further transferred to the next operating section by rotation of the transfer plate 3.

FIG. 5 shows a longitudinal section of the stretch blow molding operation section, which includes a blow mold 24 arranged so as to be able to rise freely on the machine base 1, and a blow mold 24 installed on the upper base 2. There is a core 5. Note that 26 is a lifting cylinder, and 27 is a piston.

The blowing mold 26 is opened and closed in the inside and outside directions by a cylinder device (not shown), and the blowing core 25 is provided with a stretching rod 29 inside and is brought into contact with the holding mold 12 through the holes 4 and 5. The Noriform 20 is stretched to the bottom of the mold and expanded to the mold surface of the cavity to form a container 30 having a predetermined shape as shown by the chain line.

After opening the mold, the molded container 30 is sent to the next operation section by rotation of the transfer plate 3, and the holding mold 12 from which the container 30 has been released in the operation section is sent to the injection molding operation section again.

Although the illustrated preform mark is flat, the preform may have other shapes, and the movement dimension of the holding mold 12 is as follows:
Any range is sufficient as long as a space is secured in which the preform 20 can be transferred together with the holding mold 12 when each operation section is in the open state. Further, although the description has been made with reference to the molding of one preform, it is also possible to mold a plurality of f-reforms at the same time, so the present invention is not limited to the illustrated embodiment.

(Effects of the Invention) As described above, the present invention allows the holding mold on the lower surface of the transfer board to be freely opened and closed relative to the cavity mold together with the core mold inserted from the upper part of the upper base through the hole. , is elastically mounted on the transfer plate using a support shaft and a spring member, so that the cavity p, 1.1 can be fixed,
This allows the injection device to be placed in contact with the nozzle, thereby improving the molding cycle. Furthermore, since there is no stringing or resin loss, and a mold clamping device only needs to be provided on the core mold side, the structure of the injection molding operation section is also simplified.

[Brief explanation of drawings]

Fig. 1 is a longitudinal sectional front view of a preform molding mold device according to the present invention, Fig. 2 is a longitudinal sectional side view, Fig. 3 is a longitudinal sectional view during injection molding, and Fig. 4 is a longitudinal sectional view of the temperature control operation section. A side view, FIG. 5 is a longitudinal cross-sectional side view of the stretch blowing operation section. 1...Machine base 2...Upper base 3
...Transfer board 4,5...Hole part 6
... Cavity mold 7 ... Hot runner mold 8 ... Support shaft 9 ... Temporary mold placement 11.
... Spring member 12 ... Holding mold 1
3... Core type patent applicant Nissin Nissbee Machinery Co., Ltd. Figure 1 Figure 5

Claims (1)

[Claims] A cavity mold is fixed to a machine base together with a hot runner mold,
A holding mold for forming the outer periphery of the opening of the preform is attached to the lower surface of the transfer plate below the upper base plate above the cavity mold, and is inserted through the hole drilled in the upper base plate and the transfer plate. , in a preform forming mold device comprising a core mold that fits with the holding mold, the holding mold is movable with respect to the cavity mold together with the core mold using a support shaft and a spring member, and the transfer board A mold device for preform molding, characterized in that the mold device is configured to be elastically installed in the mold.