Browse Prior Art Database

ALLOY EXTRUDER SCREW

IP.com Disclosure Number: IPCOM000026104D
Original Publication Date: 1990-Apr-30
Included in the Prior Art Database: 2004-Apr-05
Document File: 6 page(s) / 238K

Publishing Venue

Xerox Disclosure Journal

Abstract

Electrophotographic photoreceptors frequently are prepared by vacuum evaporating selenium or alloys of selenium with materials such as tellurium and/or arsenic from crucibles onto a substrate. Photoreceptors prepared from selenium or selenium alloys can achieve improved performance by processing the alloy in an extruder having a screw design as disclosed herein. The alloy is introduced into the extruder, melt mixed, and subsequently cooled to form shots which are then placed into the crucibles for vacuum evaporation. Photoreceptors prepared from selenium processed with an extruder screw of the design disclosed herein exhibit improved electrical characteristics, increased hardness, increased photoreceptor life, and lowered residual potentials.

This text was extracted from a PDF file.
At least one non-text object (such as an image or picture) has been suppressed.
This is the abbreviated version, containing approximately 55% of the total text.

Page 1 of 6

XEROX DISCLOSURE JOURNAL

ALLOY EXTRUDER SCREW Proposed Classification Loren E. Hendrix US. C1.430/056
Alan B. Mistrater
C1. Int. Hui Chang G03g 15/00

FIG. IA

FIG. IB

12.5

FlG. IC

FIG. ID

XEROX DISCLOSURE JOURNAL - Vol. 15, No. 2 MarcWApril 1990 111

[This page contains 1 picture or other non-text object]

Page 2 of 6

ALLOY EXTRUDER SCREW(Cont'd)

1D

1D

FIG. IE

FIG. 1F

-

1F

1F

'4 FIG. IG

112 XEROX DISCLOSURE JOURNAL - Vol. 15, No. 2 MarcMApril 1990

[This page contains 1 picture or other non-text object]

Page 3 of 6

ALLOY EXTRUDER SCREW(Cont'd)

FIG. 6

XEROX DISCLOSURE JOURNAL - Vol. 15, No. 2 MarchfApril 1990 113

[This page contains 1 picture or other non-text object]

Page 4 of 6

ALLOY EXTRUDER SCREW(Cont'd)

FIG. 4

r 0.4 1.25 7

I-

--

0.4 FIG. 5

114 XEROX DISCLOSURE JOURNAL - Vol. 15, No. 2 MarcWApril 1990

[This page contains 1 picture or other non-text object]

Page 5 of 6

ALLOY EXTRUDER SCREW(Cont'd)

Electrophotographic photoreceptors frequently are prepared by vacuum evaporating selenium or alloys of selenium with materials such as tellurium and/or arsenic from crucibles onto a substrate. Photoreceptors prepared from selenium or selenium alloys can achieve improved performance by processing the alloy in an extruder having a screw design as disclosed herein. The alloy is introduced into the extruder, melt mixed, and subsequently cooled to form shots which are then placed into the crucibles for vacuum evaporation. Photoreceptors prepared from selenium processed with an extruder screw of the design disclosed herein exhibit improved electrical characteristics, increased hardness, increased photoreceptor life, and lowered residual potentials.

The approximate relative lengths of each section of the extruder screw are provided in Figures 1A through 1G in arbitrary length units. As shown, Figure 1A illustrates the first section of the extruder screw, which is situated in the feed section of the extruder. This section has an outer diameter of about 2.5 length units as shown in Figure 1A. The extruder screw has a graduated taper design as shown in Figures 1B and lC, followed by a modified taper design as shown in Figure 1D. The modified taper section is situated in the compression section of the extruder. The root depth of the screw treads graduates from about 0.4 or 0.5 length units in the section depicted in Figure 1B to about 0.1 length units in the section depicted in Figure 1D. The modified taper section maintains a constant outer diameter of about 2.5 length units through the sections depicted in Figures lB, lC, and 1D. Mixing occurs in the next section of the extruder, where the screw has first a block configuration as shown in Figure 1E and subsequently a taper design as shown in Figure 1F with a root depth in the screw treads of about
0.1 length units. Thereafter, the mixed liquid alloy passes through t...