JPH0357621A - Vented stuffing device - Google Patents

Abstract

PURPOSE:To reduce the deflection of shafts and consequently the leakage of sealing liquid and prevent the sealing properties of the device concerned due to the intrusion of polymer and the like from deteriorating by a method wherein collar-like gas barrier discs, labyrinth packagings, two mechanical seals, which are provided so as to be axially shifted to each other, and bearings, which support each mechanical seal in front and in rear, are provided.. CONSTITUTION:On respective shaftings 31b and 32b, gas barrier discs 33 and 34, labyrinth packings 35 and 36 and mechanical seals 37 and 38 are mounted. Screws 31 and 32 are supported by bearings 39 and 40 at two positions before and after the mechanical seals 37 and 38. The gas barrier discs 33 and 34 are collars in shape and make it hard for gas and polymer to enter the mechanical seals 37 and 38 and the labyrinth packings 35 and 36. In the labyrinth packings 35 and 36, water jackets for introducing cooling water are respectively provided on their outside surface and labyrinth grooves 43 and 44, the directions of rota tion of which are opposite to those of the screws, are provided on their inner surfaces so as to liquefy gasified solvent by cooling and, at the same time, to push back polymer by means of the labyrinth grooves 43 and 44.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a co-rotating two-axis vent stuffer device.

Conventional Apparatus> To explain this type of apparatus as shown in FIG.
In the process of melting and discharging from the opening 14 at the tip, the solvent contained in the material is degassed from the pipe tie, and the material that has risen from the extruder 12 together with the solvent is forcibly extruded. This is to push it back into the machine 12.

Therefore, in order for the pen stuffer 11 to always reliably push the material back into the extruder 12, a device using two screw scriers 15 and 16 that rotate in the same direction is widely used.

In order to efficiently degas the solvent from the pipe 17, Wilson seals or oil seals 18 and 19 are provided at the support portions of the screws 15 and 16, respectively. Good internal airtightness.

In addition, as shown in FIG. 3, in order to improve the airtightness of the vent stuffer 21, there are devices that use the aforementioned Wilson seal and the like, as well as devices that use mechanical seals 22 and 23 that provide sufficient sealing.

In this device, the distance C between the shafts of the screws 24 and 25 is narrow, and if the mechanical seals 22 and 23 are installed at the same position on both screws 24 and 25, the outer diameter size is large and they interfere with each other, so they are installed in front and behind each other. .

Problems to be Solved by the Invention> However, in the former case, the conventional device has insufficient sealing performance, and in the latter case, two mechanical seals are installed one behind the other, so the shaft part Since 24a and 25a are long, the bearings 26 and 27, which are the supporting parts of the screws, are also separated from the threaded parts 24b and 25b, so the swing of the screws 24 and 25 becomes large, and the mechanical seals 22 and 23 are broken. Seal fluid leaks easily. -1 The volima that came out of the molding machine along with the solvent also entered the mechanical seal, worsening the sealing performance.

SUMMARY OF THE INVENTION An object of the present invention is to provide a two-shaft vent stanofer device that uses a mechanical seal with good sealing performance, and that rotates in the same direction so that the shaft does not run out easily and the sealing liquid of the mechanical seal does not leak.

<Means for Solving the Problems> In order to achieve the above-mentioned object, the present invention provides a co-rotating motor for extruding a polymer containing a solvent using a certain screw from a threaded part and a rear shaft part thereof. In a two-shaft pen stuffer device, a collar-shaped gas cutoff is installed in each of the shaft parts of the two-shaft screw in order from the threaded part side to change the direction of gas etc. coming out from the threaded part side along the shaft. Labyrinth Hanokin has a cooling disk on the outer periphery, a jacket for introducing cooling water to liquefy gas, etc., and a labyrinth for discharging polymer on the inner diameter. This is a two-shaft pentostanofer device characterized by the provision of bearings for support at the front and rear.

Function: Solvents and polymers coming out of the molding machine enter the mechanical seal through the gas-blocking disc and labyrinth packing! do not have. Furthermore, since the screw is supported by bearings at two locations, before and after the mechanical seal, vibration of the shaft is prevented.

Embodiment> Next, an embodiment of the present invention will be described with reference to FIG.
1 and 32 are rotated by a drive device (not shown). The screws 31 and 32 each have threaded portions 31a, 32a and shaft portions 3lb, 32b.
The shaft parts 3lb and 32b are, in order from the threaded part, gas-blocking disks 33, 34, lug rinse packings 35, 36 & mechanical packings 37.
．． 38 is attached, and button b1 bearings 39 and 40 support the screws 31 and 32 at two locations before and after the mechanical seals 37 and 38, respectively.

The gas cutoff disks 33 and 34 are collar-shaped and have a pilin packing 35. Gas and polymer get into 36 and make it unpleasant. The lapirin bags/35 and 36 have a jacket for introducing cooling water on the outer surface of the shaft portion 3.
The inner diameter surface in contact with lb and 32b is installed back and forth so as not to interfere with the screw rotation, so the shaft parts 3lb and 32
b is relatively long, but the gas cutoff disk 33.34
The labyrinth spanokins 35 and 36 prevent the intrusion of gas and polymer.

As mentioned above, the invading polymer may be pushed back to the screw side by the groove opposite to the screw rotation, but the lapirin groove in the same direction as the screw rotation allows it to pass through the labyrinth packing, and the polymer is pushed back to the outside at the rear side of the packing. It is also possible to discharge it to

41 and 42 are pipes for discharging solvent gas.

Effects of the Invention> As mentioned above, the mechanical seal
The screw and labyrinth spanokin prevent gas and polymer from entering, and since the bearings support the screw at the front and back positions of the mechanical seal, there is little runout of the screw. It is possible to prevent deterioration of sealing performance due to the intrusion of foreign substances.

[Brief explanation of drawings]

FIG. 1 is a diagram of a two-shaft vent stuffer device showing one embodiment of the present invention. FIG. 2 is a diagram of a conventional device, showing an example in which a Wilson seal is used as a seal. FIG. 3 is a diagram of another conventional device, showing an example in which a mechanical seal is used for the seal. 31.32-...screw, 31a. 32a--screw part, 31b, 32b...shaft part, 33. 34... Gas cutoff disk, 35.36... Labyrinth Hanokin,
37.38...Mechanical seal, 39.40...
bearing.

Claims (1)

[Claims] In a co-rotating twin-screw vent stuffer device used for extrusion molding of a polymer containing a solvent using a screw consisting of a threaded portion and a shaft portion at the rear thereof, a screw is inserted into each of the shaft portions of the twin screw from the threaded portion side. In order, it has a collar-shaped gas cutoff disk that changes the direction of gas etc. coming out from the threaded part side along the axis, a jacket for introducing cooling water to liquefy gas etc. on the outer periphery, and a A labyrinth packing provided with a labyrinth groove for discharging polymer, two mechanical seals arranged one behind the other in the axial direction, and a bearing supporting the two mechanical seals front and rear. Axial vent stuffer device.