JPS6051406B2 - Tube container manufacturing equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an apparatus for manufacturing a tube container by using compression molding to mold the neck and shoulder portions of a tube container and at the same time joining them to a previously molded tube body. The spray nozzle descends and extrudes into the mold, and the matrix with the thermoplastic resin previously supplied into the mold is torn off by the upward movement of the spray nozzle, and with the closed forming jaws descends against the mandrel to release the metal. This invention relates to an improvement in an apparatus for molding a thermoplastic resin in a matrix mold into the neck and shoulders of a tube container by closing the mold, and at the same time joining it to a tube body fitted and held on a mandrel to mold a tube container. .

Conventionally, this type of device: Patent application publication 1986-29
This is as shown in Publication No. 01. In such a device, a slider is provided with a protruding drilling pin, which passes through the center of the forming jaw and comes into contact with the top of the mandrel when the mold is closed. Therefore, the contact area between the punching pin and the mandrel becomes a boundary, and a step is likely to be formed on the inner surface of the extrusion hole of the tube container that is actually molded, and the slider, forming jaw, and matrix as a whole descend to close the mold. The impact during closing may cause the mandrel to oscillate, resulting in misalignment between the drilling pin and the top of the mantle, which is disadvantageous in that an eccentric extrusion hole is likely to be formed.

The present invention is an improvement over the above drawbacks, and includes a protruding pin for drilling and forming that is elastically supported on the top of the mandrel, and the tip of this protruding pin is removably connected to the split-shaped through hole of the forming jaw. It is provided at the upper end of the molding surface. According to the present invention, when the mold is closed, the protruding pin engages with the through hole of the forming jaw to prevent misalignment of the mandrel, making it possible to form the extrusion hole without eccentricity. Since the hole is formed using a single protruding pin, there are no steps or burrs in the extrusion hole, and the structure is simpler because the slider can be omitted. be.

The embodiments shown in the drawings will be described below.

Fig. 1 shows the state when the mold is closed, and numeral 1 is a mandrel, a plurality of which are erected on a turret plate that rotates intermittently as is well known, to which tubes are fed from a tube body supply device (not shown). The body is fitted from above and sent to a predetermined mold placement position. The tube body a is made from a sheet material laminated with thermoplastic resin such as polyethylene resin inside and outside of an aluminum box, which is bent into a cylindrical shape and heat-sealed at the ends to form a long piece into an appropriate size. It is pre-shaped by cutting.

Reference numeral 2 denotes a form holder which can be raised and lowered by a mechanism not shown, and includes a female mold matrix 3 for molding the shoulder of the tube container, and a split female mold located above the matrix 3 that can be opened and closed for molding the neck of the tube container. There is a forming jaw 4.

The forming jaw 4 is threaded to form a thread in the neck of the tube container.

4a shows the split screw hole of the forming jaw.

A split mold through hole 4b is formed at the upper end of the mold matching surface, and is connected to the screw hole 4a, and into which a protruding pin for drilling and molding, which will be described later, can be freely engaged and removed.

The forming jaw 4 is opened and closed by a shifter 7 that moves left and right by a piston rod 6 of a hydraulic cylinder 5, as shown in FIG.
It is done in

That is, there is a roller 9 at the tip of the forked lever of the shifter 7, which engages with the cam groove 9 of the forming jaw 4, and the forming jaw 4 can slide in the guide groove 10 of the form holder 2. , the forming jaw 4 is opened and closed as the forked lever reciprocates.

Further, there is a pin 11 on the form holder 2 for centering when the forming jaw 4 is closed, and the stepped portion 12 of the forming jaw 4 engages with this pin 11. Furthermore, a pin 13 for locking the forming jaw 4 in the closed state is provided on the shifter 7, and this pin 13 slides in the guide hole 14 of the form holder 2, projects into the guide groove 10, and locks into the lock hole 15 of the forming jaw 4. It's starting to engage. Note that 16 is a shock-reducing spring that is wound around the piston rod 6.

Next, a protruding pin 17 that engages with the split hole 4b of the forming jaw 4 is elastically supported on the top of the mandrel 1.

The protruding pin 17 consists of a hollow cylinder 17a having an outer diameter for drilling, and a protruding part 17b is provided at the top of the hollow cylinder 17a, and the outer diameter of the protruding part 17b is formed to be the same size as the split-shaped through hole 4b. It is formed to have the same size as the S-divided through hole 4b, and has the same height and length as the S-divided through hole 4b.

Thus, a flange 17c is formed at the lower end of the hollow cylinder 17a,
This can be freely engaged with and detached from the lower edge 1c of the upper opening 1b of the hollow portion 1a in the mandrel 1, so that the hollow tube 17a can slide within the upper opening 1b.

A support body 18 is inserted into the hollow portion 1a of the mandrel 1, and a spring 19 is interposed between the top of this support body 18 and the hollow cylinder 17a.
has come to be supported elastically.

The support body 18 is rod-shaped and has a double cooling water supply path 20 and a cooling water return path 21 formed therein, which communicate with an opening 18a at the top of the support body 18 and an opening 18b at the side, respectively. A spline groove 18c is formed on the upper circumference of the support body 18 so that the cooling water supplied from the passage 20 to the hollow portion 1a through the opening 18a is returned to the return passage 21 from the opening 18b.

The support body 18 and the mandrel 1 are integrated with a stopper 22, and O-rings 23 and 24 are connected to the upper opening 1b and the support body, respectively, to prevent the cooling water supplied to the hollow part 1a of the mandrel 1 from leaking. It is set at 18.

Now, the operation of the above-mentioned device will be explained based on FIGS. 3 to 9. First, as shown in FIG. It's open.

From this state, as shown in FIG. 4, the spray nozzle 23 of the polyethylene resin extruder descends to extrude the polyethylene resin into the matrix 3 mold.

Next, as shown in FIG. 5, the spray nozzle 23 is raised and the extruded polyethylene resin is torn off and remains in the matrix 3 mold.

When the polyethylene resin is previously supplied into the mold of the matrix 3 in this way, the molding machine 4 is closed as shown in FIG.

Next, as shown in FIG. 7, the form holder 2 is lowered relative to the mandrel 1 to close the mold together with the mandrel.
The polyethylene resin remaining in the mold of the matrix 3 is molded onto the neck and shoulder parts of the tube container, and at the same time, it is bonded to the tube body a, which has been fitted onto the mandrel 1 in advance.

At this time, since the inner surface of the tube body a is made of polyethylene resin, the polyethylene resin molded as described above is well adhered to the inner surface of the tube body a.

Thus, the forming jaw 4 is opened as shown in FIG. 8, and then the form holder 2 is raised as shown in FIG. 9, returning to the position shown in FIG. 3, and the formed product remains on the mandrel 1.

The mandrel with the formed tube container shall be rotated to the cap supply position on the next revolution of the turret plate).
Become. As shown in detail in FIG. 1, in the position shown in FIG. 7, the protruding pin 17 has its protruding portion 17b engaged with the split die through hole 4b, and the center of the protruding pin 17 does not shift when the form holder 2 is lowered. Even if the pin 17 hits the through hole 4b, the spring 19 can cushion the impact.

Further, since cooling water is constantly supplied to the hollow portion 1a of the mandrel 1 through the supply path 20 and return path 21 of the support 18, the mandrel 1 and the protruding pins 17 are cooled and do not interfere with molding.

Note that the cooling structure of the mandrel is not limited to that shown in the drawings. As explained above, the present invention is provided with a protruding pin for drilling and forming that is elastically supported on the top of the mandrel, and a split-shaped through hole whose tip can be freely engaged and detached is provided at the upper end of the molding surface of the forming jaw. When the mold is closed, the protruding pin engages with the through hole of the forming jaw to maintain the mandrel in a locked state, producing the effect described at the beginning, and the protruding pin elastically moves against the mandrel. Since the projecting pin is supported by the forming jaw when the form holder is lowered, the impact is alleviated and no misalignment occurs even if the projecting pin hits the forming jaw.

[Brief explanation of drawings]

FIG. 1 is a sectional view of the apparatus of the present invention at the time of opening a mold. FIG. 2 is a partially cutaway plan view of the forming jaw portion. FIGS. 3 to 9 are explanatory diagrams showing the operating sequence of the apparatus of the present invention. 1...Mandrel, 2...Form holder, J3...Matrix, 4...
... Forming jaw, 4a... Split screw hole of forming jaw, 4b... Split through hole of forming jaw, 17... Protruding pin.

Claims (1)

[Claims] 1. By lowering the forming jaw and the matrix relative to the mandrel and closing the mold, the thermoplastic resin previously supplied from the spray nozzle into the matrix mold is molded to form the neck and shoulder of the tube container. In a device that is joined to a tube body that is fitted and held on a mandrel at the same time as forming, a protruding pin for drilling and forming that is elastically supported on the top of the mandrel is provided, and the tip of this pin forms a through hole that can be freely engaged and detached. A tube container manufacturing device installed at the upper end of the molding surface of the forming jaw.