Process for producing polyester composition
First Claim
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1. A process for producing a polyester sheet comprising melt-extruding a polyester resin by using a vent-type twin-screw extruder in sheet-wise onto the surface of a rotating chilling drum under the condition satisfying the following formula (1):
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space="preserve" listing-type="equation">5.2×
10.sup.-6 ×
D.sup.2.8 ≦
Q/N≦
15.8×
10.sup.-6 ×
D.sup.2.8 (
1)wherein D mm represents the inner diameter of the extruder cylinder, Q kg/hr represents the extrusion rate per unit time and N rpm represents the screw number of revolution.
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Abstract
The present invention relates to a process for producing a polyester sheet comprising melt-extruding a polyester resin by using a vent-type twin-screw extruder in sheet-wise onto the surface of a rotating chilling drum under the condition satisfying the following formula (1):
5.2×10.sup.-6 ×D.sup.2.8
≦Q/N≦15.8×10-6 ×D2.8 (1)
wherein D mm represents the inner diameter of the extruder cylinder, Q kg/hr represents the extrusion rate per unit time and N rpm represents the screw number of revolution.
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Citations
15 Claims
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1. A process for producing a polyester sheet comprising melt-extruding a polyester resin by using a vent-type twin-screw extruder in sheet-wise onto the surface of a rotating chilling drum under the condition satisfying the following formula (1):
-
space="preserve" listing-type="equation">5.2×
10.sup.-6 ×
D.sup.2.8 ≦
Q/N≦
15.8×
10.sup.-6 ×
D.sup.2.8 (
1)wherein D mm represents the inner diameter of the extruder cylinder, Q kg/hr represents the extrusion rate per unit time and N rpm represents the screw number of revolution. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A process for producing a polyester sheet comprising
using a vent-type twin-screw extruder, using a polyester resin having not lower than 1× - 10-7 Ω
cm of a specific resistance when melted as starting material,supplying said polyester and a metal salt of an aliphatic monocarboxylic acid or dicarboxylic acid in amount of 0.5 to 1,000 ppm, calculated as metallic atom, based on the polyester resin, and closely adhering the molten polyester sheet extruded onto a rotating chilling drum from the extruder to the surface of said chilling drum by use of an electrostatic pinning technique. - View Dependent Claims (13, 14)
- 10-7 Ω
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15. A process for producing a polyester sheet by using a vent-type twin-screw extruder, comprising conducting a melt-extrusion by supplying a polyester and a slurry of inorganic and/or organic particles to a same material feed opening of said extruder.
Specification