Continuous methods of making microporous battery separators

Details Continuous methods of making microporous battery separators Continuous methods of making microporous battery separators

2005-04-12

2005-04-12

Purvis, Sue A. (Department: 1734)

Adhesive bonding and miscellaneous chemical manufacture

Methods

Surface bonding and/or assembly therefor

C156S160000, C156S244110, C264S046100

Reexamination Certificate

active

06878226

ABSTRACT:
A continuous method of making dry-stretch microporous membrane battery separators from polypropylene (PP) or polyethylene (PE) or both benefits to the manufacturers in the production efficiency. The precursor-film extrusion in this invention is accomplished by multiple small film-extrusion lines at a compatible line speed with the followed oven processes (annealing and stretching). The overall production process starts continuously from film extrusion to annealing and to stretching. The benefits of the inventive continuous process includes a higher product yield, more effective oven-time usage, no need to handle and manage the intermediate products, less need in labor and machine maintenance, and potentially more stable product quality.The dry-stretch membrane separators made with this inventive continuous method include (1) single-ply PP or PE separators having a thickness ranging from 0.2 mil to 2.0 mil; (2) PP/PE/PP trilayer microporous membrane separators having a thickness ranging from 0.6 mil to 4.0 mil. The PP/PE/PP trilayer can be accomplished in the early extrusion via either co-extrusion or extruding separately and then interposing PE layer between two PP layers, continuously, right before annealing/bonding and stretching process.

REFERENCES:
patent: 3426754 (1969-02-01), Bierenbdum et al.
patent: 3558764 (1971-01-01), Isaacson et al.
patent: 3679538 (1972-07-01), Druin et al.
patent: 3679540 (1972-07-01), Zimmerman et al.
patent: 3801404 (1974-04-01), Druin et al.
patent: 3801692 (1974-04-01), Zimmerman et al.
patent: 3843761 (1974-10-01), Bierenbaum et al.
patent: 3932682 (1976-01-01), Loft et al.
patent: 4138459 (1979-02-01), Brazinsky et al.
patent: 4384023 (1983-05-01), Okamura et al.
patent: 4539256 (1985-09-01), Shipman et al.
patent: 4726989 (1988-02-01), Mrozinski
patent: 4994335 (1991-02-01), Kamaei et al.
patent: 5173235 (1992-12-01), Kamei et al.
patent: 5565281 (1996-10-01), Yu et al.
patent: 5667911 (1997-09-01), Yu et al.
patent: 5691077 (1997-11-01), Yu
patent: 5952120 (1999-09-01), Yu et al.
patent: 6080507 (2000-06-01), Yu
patent: 6132654 (2000-10-01), Yu

Affiliated with

Also associated with

Rating

Continuous methods of making microporous battery separators does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Continuous methods of making microporous battery separators, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Continuous methods of making microporous battery separators will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-3440948