JPH0351323Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention relates to a sealing device for a die header used in the production of synthetic resin polymers.

[Conventional technology and problems]

For example, the production of polyester, nylon, and other synthetic resin polymers is carried out using a polymerization reactor 1 and a valve 2 with a die head attached to the lower part of the reactor 1, as shown in FIG.

The valve 2 with a die head includes a valve 3 with a heat medium jacket and a die header 4 with a heat medium jacket.
The valve 3 maintains the vacuum inside the can during the polymerization reaction process, and also turns on/off polymer discharge and adjusts the flow rate when the polymerization reaction is completed.

In addition, the die header 4 distributes the polymer equally using a die plate 5 housed inside, forms it into a predetermined shape such as a strand shape or a slit shape, and discharges it into the atmosphere. The next step is the chip cutter.

By the way, the polymerization reactor 1 is used in batch operation, and the polymerization reaction is performed intermittently, so if the polymerization reaction vessel 1 is left as it is between the completion of polymer removal and the next process, the polymer adhering to the inner wall of the die header will oxidize. Otherwise, it will drip from the die plate, and it is necessary to take measures to prevent this.

Conventionally, in order to prevent the oxidation of the polymer adhering to the inner wall of the die header, a gasket 6 was attached to the lower part of the die header 4, a cover 7 was placed over it from the outside, and this was fixed with bolts. This seals the molding holes to prevent air from entering and prevents oxidation of the remaining polymer from the previous process.

However, in the conventional method of manually attaching the gasket 6 and cover 7 to the die header 4, the work must be carried out in the presence of high-temperature polymer of 280°C to 300°C, which creates a poor working environment. There are problems in that it is extremely bad and dangerous, and the workability is also poor, and improvements are desired.

[Purpose of invention]

This invention was made to solve the above problems, and the purpose is to provide a sealing device for a synthetic resin die header that can safely and efficiently close the lower end of the die header.

[Means for solving problems]

In order to solve the above-mentioned problems, this invention arranges a die plate at the bottom of the die header so as to move forward and backward with respect to the discharge port of the die header, and the die plate is placed in the retracted position. In some cases, a shutter section for closing the discharge port of the die header is arranged in series.

[Effect]

During the polymer discharge process, the die plate is in the forward position, and the polymer is extruded from the forming hole communicating with the discharge port of the die header.

When the discharge of the polymer is completed, the die plate moves to the retracted position, and a shutter portion integrally provided with the die plate advances directly below the die header to close the discharge port of the die header.

〔Example〕

Embodiments of this invention will be described below with reference to FIGS. 1 to 4 of the accompanying drawings. Note that the same parts as in FIG. 5 are designated by the same reference numerals, and the description thereof will be omitted.

As shown in the figure, a support frame 11 is fixed to the lower part of the die header 4, and the support frame 11 supports the die plate 12 and the shutter section 13 provided integrally with the plate 12 so as to be horizontally movable. There is.

The die plate 12 is provided with a large number of forming holes 14, and the polymer flowing out from the discharge port 4a of the die header 4 is formed into a predetermined shape by the forming holes 14.
3 is a discharge port 4a in the die header 4.
The die header 4 is formed in a planar size that can close the lower opening of the die header 4, and is arranged so that its upper surface slides against the lower surface of the die header 4 by means of a support frame 11.

In addition, the die plate 12 and the shutter section 13
It is preferable that the die plate 12 and the shutter portion 13 be pushed up at all times using a spring or the like so that the die plate 12 and the shutter portion 13 are attached to the lower surface of the die header 4 so that the upper surface is always in pressure contact and the sealing effect of the sliding surface is improved.

The rear end of the shutter section 13 of the die plate 12 is connected to a piston rod 16 of a cylinder 15 attached to the support frame 11, and as the cylinder 15 expands and contracts, either the die plate 12 or the shutter section 13 is connected to the die header 4. A forward and backward movement is applied so that the discharge port 4a is located directly below the discharge port 4a.

The sealing device of this invention has the above-mentioned configuration, and during the polymer discharge process, the cylinder 15 contracts as shown in FIG. It is in a molded state.

When the polymer discharge process is completed, the cylinder 15
is extended and the die plate 12 retreats from directly below the discharge port 4a, and at the same time, the shutter section 13 advances directly below the discharge port 4a as shown in FIG. 3, closing the discharge port 4a, thereby opening the die header 4. This prevents the occurrence of oxidation of the polymer adhering to the inner wall, and prevents the polymer from flowing out from the discharge port 4a.

In addition, at the time of the next polymer discharge process, the cylinder 15 is contracted and the die plate 1 is
2 should be returned to just below the discharge port 4a.

〔effect〕

As described above, according to this invention, a die plate is placed directly below the discharge port of the die header so as to be able to move forward and backward, and a shutter section is provided in series with this die plate, so that when the die plate retreats from the discharge port, the shutter section Since the discharge port was closed,
The die header can be sealed by remote control, improving the safety and efficiency of sealing work.

[Brief explanation of the drawing]

Fig. 1 is a front view showing how the sealing device according to the invention is attached to the die header, Fig. 2 is an enlarged sectional view showing the polymer discharge state of the main part of the same, and Fig. 3 is an enlarged sectional view showing the sealing state of the above. 4 are exploded perspective views of the same essential parts, and FIG. 5 is a front view showing a conventional sealing means. 1... Polymerization reactor, 2... Valve with die head, 3... Valve, 4... Die header, 11...
... Support frame, 12 ... Die plate, 13 ... Shutter part, 14 ... Molding hole, 15 ... Cylinder.

Claims (1)

[Scope of utility model registration request] A die plate is arranged at the bottom of the die header so as to move forward and backward relative to the discharge port of the die header,
A sealing device for a synthetic resin die header, wherein the die plate is provided with a shutter portion that closes a discharge port of the die header when the die plate is in a retracted position.