JP3774382B2 - Oligomer removal equipment for vented twin screw extruder - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an oligomer removal apparatus for a vented twin screw extruder, and more specifically, an oligomer for removing an oligomer contained in a gas content of a molten resin generated in a vented twin screw extruder used for resin production such as polyester. It relates to a removal device.
[0002]
[Prior art]
Conventionally, as the oligomer removing device of this type of vented twin screw extruder, the one shown in FIG. 3 has been adopted. That is, the two vent boxes 22 provided in the twin-screw extruder 21 are respectively connected to the header 23, and the header 23 is a gas inlet nozzle 25 provided on the upper side portion of the two cylindrical oligomer tanks 24. Are connected to each other via a valve 26. A gas outlet nozzle 27 provided in the lower part of the oligomer tank 24 is connected to a vacuum device (not shown) via a valve 28. A lid 23 is fastened to the upper part of the tank body 29 of the oligomer tank 24 by a clamp 24.
[0003]
A cylindrical filter case 22 as shown in FIG. 4 is mounted in the tank body 29 of the oligomer tank 24. A filter 25 is fastened to the outer periphery of the filter case 22 with a filter-pushing 26 as shown in FIG. 5, and a filter-holding 27 as shown in FIG. 6 is attached to the bottom of the filter case 22. .
[0004]
When extruding undried pellets such as polyester resin and polyamide resin with the above twin screw extruder 21, moisture and oligomer (low molecular weight) exhausted from each vent box 22 are vacuum sucked into an oligomer tank 24 and filtered. The discharged gas is exhausted by a vacuum device.
[0005]
When replacing the filter 25, the clamp 24 is removed, the lid 23 is opened, the filter case 22 is taken upward, the filter retainers 26 and 27 are removed, and the filter 25 is removed and replaced.
[0006]
[Problems to be solved by the invention]
In the above conventional apparatus, since the lid and the filter case are taken out from the upper part of the tank body of the oligomer tank, it is necessary to work at a high place and transport heavy objects, such as a crane.
[0007]
The present invention has been made to solve the above-described problems, and aims to eliminate work at a high place, facilitate attachment and removal of a door and a filter case, and reduce the cost of the apparatus.
[0008]
[Means for Solving the Problems]
The oligomer tank of the oligomer removing apparatus according to the present invention has a rectangular parallelepiped shape, and a gas inlet nozzle is provided at the upper part of the tank body of the oligomer tank, and a gas outlet nozzle is provided at the lower side part. Is provided with a plurality of filter cases arranged in parallel vertically to the front surface of the tank body, and a filter clamped by a filter presser to the filter case. A door is clamped on the front surface of the tank body. The filter case is inserted into rails provided on the upper and lower parts of the tank body so as to be movable back and forth, and the upper part in the tank body is sealed except between the upper rails, and the lower part is The oligomers are opened except between the lower rails, and the oligomers are sent downward through the upper rails.
[0010]
Thereby, the moisture and oligomer supplied between the filters from the upper part of the tank body pass through the filter and are filtered, and the filtered gas body is discharged from the gas outlet nozzle provided below.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described based on examples with reference to the drawings.
[0012]
FIG. 1 is a configuration diagram of a devolatilizing apparatus of a vented twin-screw extruder according to the present invention. As shown in the figure, the two vent boxes 2 provided in the twin-screw extruder 1 are connected to headers 3 respectively, and the headers 3 are provided at the upper part of two rectangular parallelepiped oligomer tanks 4. Each gas inlet nozzle 5 is connected via a valve 6. A gas outlet nozzle 7 provided on the lower side of the oligomer tank 4 is connected to a vacuum device (not shown) via a valve 8.
[0013]
When extruding undried pellets such as polyester resin and polyamide resin with the twin screw extruder 1, moisture and oligomers (low molecular weight substances) exhausted from each vent box 2 are vacuum sucked into the oligomer tank 4 and filtered. The discharged gas is exhausted by a vacuum device.
[0014]
FIG. 2 is an exploded perspective view of an oligomer tank according to the present invention.
[0015]
As shown in FIG. 2 (a), two reverse concave rails 10a are horizontally provided at an upper portion in the tank body 9 of the oligomer tank 4 toward the front surface of the tank body 9, In the lower part, a concave rail 10b is horizontally provided at a position facing the reverse recess.
[0016]
Since the upper surface of each upper rail 10a is connected to the left and right side plates by a plate or the like, the upper part in the tank body 9 is sealed except between the upper rails 10a. Therefore, the moisture and oligomer sucked from the gas inlet nozzle 5 pass between the upper rails 10a and are sent downward.
[0017]
The lower surfaces of the lower rails 10b are connected to each other, and both rails 10b are connected to the bottom of the tank body 9 by a support plate 11 provided at the lower part. Since the support plate 11 is not provided on the entire surface, the filtered gas component can be discharged from the gas outlet nozzle 7.
[0018]
Flat plate filter cases 12 are mounted on the rails 10a and 10b provided to face each other. A door 13 is airtightly attached to the front portion of the tank body 9 by a clamp 14.
[0019]
As shown in FIG. 2 (b), a filter 15 is fastened to the filter case 12 with a filter presser 16.
[0020]
As a result, moisture and oligomer sucked from the gas inlet nozzle 5 of the oligomer tank 4 are sent to the two filters 15 through the gap between the upper rails 10a, and the gas component filtered by the two filters 15 becomes the rail 10b. And is discharged from the gas outlet nozzle 7.
[0021]
When replacing the filter, the clamp 14 is removed, the lid 13 is opened, the filter case 12 is taken forward, the filter retainer 16 is removed, and the filter 15 is removed for replacement.
[0022]
In the above embodiment, two oligomer tanks of the oligomer apparatus are used, but two or more may be used as necessary. In addition, although two filter cases are inserted into the oligomer tank, two or more filter cases may be used as necessary.
[0023]
【The invention's effect】
According to the oligomer removing apparatus according to the present invention, since the oligomer tank is short, there is no work at a high place, and the filter is divided and lightweight, so that the door can be opened and closed without using a crane or the like. In addition, the filter can be easily put in and out and the filter can be exchanged.
[Brief description of the drawings]
FIG. 1 is a configuration diagram of an oligomer removing apparatus of a twin screw extruder according to the present invention, (a) is a plan view and (b) is a front view.
FIG. 2 is an exploded perspective view of an oligomer tank according to the present invention.
FIG. 3 is a configuration diagram of an oligomer removal apparatus of a conventional twin-screw extruder, (a) is a plan view, and (b) is a front view.
FIGS. 4A and 4B are configuration diagrams of a filter case with a conventional filter attached, where FIG. 4A is a plan view and FIG. 4B is a front view.
FIG. 5 is a configuration diagram of a conventional filter holder for an outer peripheral portion.
FIG. 6 is a configuration diagram of a conventional filter presser for a low part.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Twin screw extruder 2 Vent box 3 Header 4 Oligomer tank 5 Gas inlet nozzle 6, 8 Valve 7 Gas outlet nozzle 9 Tank main body 10a, 10b Rail 11 Support plate 12 Filter case 13 Door 14 Clamp 15 Filter 16 Filter presser

Claims (1)

An oligomer removal device connected to a vent box (2) provided in a vented twin-screw extruder (1) and removing an oligomer contained in a gas content of a molten resin generated in the extruder (1),
The oligomer tank (4) constituting the oligomer removing device is formed in a rectangular parallelepiped shape , a gas inlet nozzle (5) is provided on the upper part of the tank body (9) of the oligomer tank (4), and a gas outlet is provided on the lower side. A nozzle (7) is provided , and in the tank body (9), a plurality of plate-like filter cases (12) arranged in parallel vertically toward the front surface of the tank body (9), filter (15) is provided which is clamped with a filter presser (16) to the filter case (12), the front surface of the tank body (9), and a door (13) hermetically attached to said filter Ke The tank (12) is inserted into the rails (10a, 10b) provided at the upper and lower parts of the tank body (9) so as to be movable back and forth, and the upper part in the tank body (9) is between the upper rails (10a). Except An oligomer of a twin-screw extruder with a vent which is closed and opened below except between the lower rails (10b), and the oligomer passes between the upper rails (10a) and is sent downward. Removal equipment.

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