JPH11170337A - T-die heating apparatus in extruder - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide the T-die heating apparatus in an extruder improved in flatness without exerting effect on the flow of an elastomer exerting effect on the thickness uniformity of a sheet like material in an extruder equipped with a T-die. SOLUTION: Correction heating means 17 comprising plate-shaped heaters (lip heaters) 17a with a predetermined length adjusting the extrusion temps. of both end parts of a sheet material W immediately after extruded to the back part of a lower extrusion port 15 are attached in the vicinity of both end parts in the longitudinal direction of a T-die 4. These correction heating means 17 heating both end parts of the sheet material W immediately after extruded at a heating temp. of about 200 deg.C to adjust the extrusion temps. of them in consideration of that both ends of the sheet material immediately after extruded from the T-die 4 lower in temp. by 20-40 deg.C through the temp. of the elastomer of a supply port 11 is 200-210 deg.C and the plate-shaped heaters 17a (lip heaters) are embedded in the T-die 4 over predetermined length from both end parts of the die.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heating device for a T-die (T-type extrusion die) in an extruder, and more particularly to an influence on an elastomer flow which affects thickness uniformity. The present invention relates to a heating device for a T-die in an extruder having improved flatness without any problem.

[0002]

2. Description of the Related Art Heretofore, an extruder equipped with a T-die has been used to obtain a thickness of about 0.5 to 3.0 mm and a width of 3,000 to 3,500
When extruding a sheet material such as a waterproof sheet or a film having a thickness of mm, the flatness is an important required characteristic of the sheet material.

[0003]

In particular, when the line speed is low, the central portion of the extruded sheet material is wound up by a roll because the cooling speed at both ends of the extruded sheet material is higher than that at the central portion. As a result, there is a problem that the length of the central portion of the sheet becomes shorter than that of both ends, and the entire sheet-like material is distorted and the flatness is deteriorated.

[0004] Furthermore, both ends of the sheet material are easily cooled on the roll after being wound up, and the center portion is also stretched here, which causes poor flatness. Also, in order to alleviate that the cooling rate at both ends of the sheet material is faster than that at the center, the temperature of the T-die itself is changed between the center and both ends, and the resin temperature at both ends of the sheet material is increased. However, the flow path design of the T-die presupposes isothermal and steady flow, which has an adverse effect on the flow of the elastomer, resulting in poor uniformity of thickness and the like.

SUMMARY OF THE INVENTION An object of the present invention is to provide an extruder having a T-shaped die in which the flatness is improved without affecting the flow of the elastomer which affects the uniformity of the thickness of the sheet material. An object of the present invention is to provide a die heating device.

[0006]

SUMMARY OF THE INVENTION In order to achieve the above-mentioned object, the present invention provides an extruder in which the extruding temperature of both ends of a sheet material immediately after being extruded is set at or near both ends of a T-shaped die attached to the tip of an extruder body. The gist is that a correction heating means for adjusting the temperature is provided. In addition, the present invention
At or near both ends of a T-type die attached to the tip of the extruder body, a correction heating means for adjusting the extrusion temperature of both ends of the sheet material immediately after being extruded is provided,
The gist is that second correction heating means for adjusting the temperature of both ends of the extruded sheet material is installed at both ends of the conveying means connected to the T-die.

As described above, in the present invention, when the sheet material is extruded by the T-die in the extruder, the cooling speed at both ends of the sheet material is reduced, so that the temperature adjustment of the T-die itself is performed at the center. Part and both ends, while increasing the temperature of the elastomer at both ends of the sheet-like material,
By providing correction heating means at or near both ends of the T-die for adjusting the extrusion temperature of both ends of the sheet material immediately after being extruded, the flow of the elastomer is smoothed and the thickness of the sheet material is made uniform. And the flatness of the entire sheet material can be improved at the same time.

[0008]

Embodiments of the present invention will be described below with reference to the accompanying drawings. FIG. 1 is a schematic front view of an entire extruder provided with a T-type die embodying the present invention, FIG. 2 is a plan view of FIG. 1, and 1 is a support mounted movably along a guide rail 2. An extruder main body installed on the table 3,
Reference numeral 4 denotes a T-type die attached to the tip of the extruder main body 1, and at the lower part of the T-type die 4 (T-type base), a sheet material W such as an extruded waterproof sheet or a film is cooled. A cooling take-off device 5 including a plurality of cooling rolls is provided.

An intermediate guide roll device 6 composed of a plurality of rolls is installed on the downstream side of the cooling take-off device 5, and a thickness gauge of the sheet material W is provided on the downstream side of the intermediate guide roll device 6. 7, a take-up machine 8, an accumulator 9 for adjusting the feed length of the sheet-like material W, and a winding device 10 are installed substantially linearly. As shown in FIGS. 3 to 5, the T-die 4 attached to the tip of the extruder main body 1 has a supply port 11 for a molten elastomer formed at the upper center in the longitudinal direction of the T-die 4. Further, the inside of the T-die 4 is divided into a plurality of regions (11 zones in this embodiment), and at the center thereof, a flow hole 12 connected to the supply port 11 along the longitudinal direction is provided. Is formed.

Around the flow passage 12, a plurality of heating means 13 (plate heaters) for auxiliary heating of the extruded elastomer separated into the plurality of regions and a thermocouple 14 are provided. A slit-shaped supply path 16 communicating with a lower extrusion port 15 of the T-die 4 for extruding the sheet-like material W is formed in a lower part of the sheet-like material W. In the vicinity of both ends in the longitudinal direction of the T-die 4, a plate-like heater (lip) having a predetermined length for adjusting the extrusion temperature of both ends of the sheet material W immediately after being extruded to the back of the lower extrusion port 15. Heater) 17
The correction heating means 17 consisting of a is attached.

The correction heating means 17 has a temperature of 200 to 210 ° C. of the elastomer in the supply port 11,
The extruding temperature of both ends of the sheet material W immediately after being extruded at a heating temperature of about 200 ° C. is adjusted in consideration of the fact that both ends are lowered by 20 to 40 ° C. immediately after being extruded from the die 4. , A plate-like heater 17 from both ends of the T-die 4
a (lip heater) is buried for a predetermined length.

As the correction heating means 17, a plate-like heater 1 buried near both ends of the T-die 4 as described above.
In addition to 7a, as shown in FIG. 4, an edge heater 17b for heating the end portion of the sheet material W along the extrusion direction.
May be provided. Further, when adjusting the temperature of both ends of the extruded sheet material W, second correction heating means such as an infrared heater for heating both ends of the sheet material W on both sides of the guide roll of the intermediate guide roll device 6. It is also possible to install 18.

As described above, when the T-die 4 extrudes a sheet material W having a predetermined thickness and a predetermined width, a temperature difference caused by a high cooling rate at both ends of the sheet material W is reduced. Therefore, the temperature adjustment of the T-die 4 itself is changed between the center and both ends by a plurality of heating means 13 to set the temperature of the elastomer at both ends of the sheet-shaped material W high, A plate-like heater (lip heater) 17a or edge heater 1 for adjusting the extrusion temperature of both ends of the sheet material immediately after being extruded, at or near both ends.
By providing the correction heating means 17 composed of 7b, the flow of the elastomer can be made smooth and the uniformity of the thickness of the sheet material can be maintained, and the flatness of the entire sheet material can be improved.

Further, in order to further improve the flatness of the extruded sheet material W, a second heater such as an infrared heater for heating both ends of the sheet material W is provided on both sides of the guide roll of the intermediate guide roll device 6. It is also possible to install the correction heating means 18 for heating. In addition, a plurality of heating means 13 of the T-die 4, a plate-shaped heater 17a (lip heater) provided near the lower extrusion opening 15, a correction heating means 17 such as an edge heater 17b, and an infrared ray provided in the intermediate guide roll device 6 Temperature adjustment of the second correction heating means 18 such as a heater is controlled as a whole by a temperature control device (not shown).

In the above embodiment, when the olefin-based elastomer is extruded with a thickness of 0.5 to 3.0 mm using the T-die 4 having a width of 3,250 mm, the lower extrusion port 15 of the T-die 4 is required. 10mm-100 on both sides from the center
The flatness of the sheet material W could be improved by adjusting the temperature by increasing the length of about 15 mm to about 25 ° C. from the center by about 15 mm.

[0016]

According to the present invention, there is provided a correction heating means for adjusting the extrusion temperature at both ends of a sheet material immediately after being extruded, at or near both ends of a T-shaped die attached to the tip of an extruder body as described above. Is provided, there is an effect that the flatness of the sheet material can be improved without affecting the flow of the elastomer which affects the uniformity of the thickness of the sheet material.

[Brief description of the drawings]

FIG. 1 is a schematic front view of an entire extruder provided with a T-type die embodying the present invention.

FIG. 2 is a plan view of FIG.

FIG. 3 is an enlarged plan view of a T-type die embodying the present invention.

FIG. 4 is a front view of the T-die of FIG. 3;

FIG. 5 is an enlarged sectional view taken along the line AA of FIG. 4;

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Extruder main body 2 Guide rail 3 Support stand 4 T-die 5 Cooling take-up device 6 Intermediate guide roll device 7 Thickness gauge 8 Take-up device 9 Accumulator 10 Winding device 11 Elastomer supply port 12 Flow hole 13 Heating means (rod shape) Heater) 14 Thermocouple 15 Lower extrusion port 16 Supply path 17 Correction heating means 17a Plate-shaped heater (lip heater) 17b Edge heater 18 Second correction heating means W Sheet material

Claims (4)

[Claims] 1. An extruder comprising an extruder provided with correction heating means for adjusting the extruding temperature at both ends of a sheet material immediately after being extruded, at or near both ends of a T-die attached to a tip of an extruder body. Die heating device. 2. The extruder according to claim 1, wherein the correction heating means is a lip heater provided at both ends of the T-die or an edge heater attached near the ends thereof.
Die heating device. 3. A correction heating means for adjusting the extrusion temperature of both ends of a sheet material immediately after being extruded is provided at or near both ends of a T-die attached to the tip of an extruder main body. A heating device for a T-type die in an extruder, comprising second correction heating means for adjusting the temperature of both ends of the extruded sheet material at both ends of a conveying means to be connected. 4. The T-die heating device according to claim 3, wherein said second correction heating means is an infrared heater.