Process for preparation of thermoplastic resin sheets

Details Process for preparation of thermoplastic resin sheets Process for preparation of thermoplastic resin sheets

1989-05-23

1991-03-05

Thurlow, Jeffery

Plastic and nonmetallic article shaping or treating: processes

Carbonizing to form article

Agglomeration or accretion

264 24, 264216, 4251748E, 425224, B29C 5910, B29C 7104

Patent

active

049976001

ABSTRACT:
A thermoplastic sheet is prepared by (i) extruding a molten thermoplastic resin in the form of a sheet from a molding die; (ii) applying static charges to the extruded resin sheet from a first electrode whereby the charged resin sheet is pinned to the surface of an electrical insulating layer of a quenching roller to quench the resin sheet; (iii) peeling the quenched sheet from the surface of the quenching roller; and (v) applying electrostatic charges having a reverse polarity to that of the electrostatic charges from the first electrode to the exposed surface portion of the quenching roller from a second electrode. The quenching roller is made of an electrically earthed substrate and the electrical insulating layer formed on the surface of the substrate. The second electrode is made of a plurality of electrodes arranged at intervals along the rotating direction of the quenching roller between the sheet-peeling position where the quenched sheet is peeled from the quenching roller and the sheet pinning-initiating position where the sheet to be quenched is pinned to the quenching roller, and the electrical insulating layer has a volume resistance and surface resistance of at least 10.sup.7 .OMEGA. and a surface roughness not larger than 0.3 .mu.m expressed as the center line average roughness (Ra).

REFERENCES:
patent: 3898026 (1975-08-01), Sauer et al.
patent: 4478772 (1984-10-01), Takagi et al.
patent: 4594203 (1986-06-01), Hagiwara et al.

Affiliated with

Also associated with

Rating

Process for preparation of thermoplastic resin sheets does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Process for preparation of thermoplastic resin sheets, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Process for preparation of thermoplastic resin sheets will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-495070