Controlled-porosity, calendered spunbonded/melt blown laminates

Details Controlled-porosity, calendered spunbonded/melt blown laminates Controlled-porosity, calendered spunbonded/melt blown laminates

1993-10-04

1994-05-03

Bell, James J.

Stock material or miscellaneous articles

Structurally defined web or sheet

Discontinuous or differential coating, impregnation or bond

156167, 1563082, 428284, 428297, 428298, 428296, 428903, B32B 2700

Patent

active

053086910

ABSTRACT:
Controlled porosity composite sheets comprising a melt-blown polypropylene fiber web having a spunbonded polypropylene fiber sheet laminated to at least one side thereof are made by calendering an assembly of the component webs in such a manner that, when a two-layer composite sheet is made, the web of melt-blown fibers is in contact with a metal roll heated to 140.degree.-170.degree. C. operating against an unheated resilient roll; and, when a three-layer composite sheet is made, the spunbonded web in contact with the heated metal roll has a dtex per fiber value of less than 6.
These composite sheets have a Gurley-Hill porosity of about 5-75 seconds, excellent mechanical and tear strengths, high water vapor penetration rate, and low liquid water permeability. They are particularly suitable for making housewrap sheets and sheets for sterile packaging. In the sterile packaging field, they are significantly better than medical paper used for the same purpose.

REFERENCES:
patent: 3978185 (1976-08-01), Buntin et al.
patent: 4684568 (1987-08-01), Lou
patent: 4766029 (1988-08-01), Brock et al.
patent: 4898761 (1990-02-01), Dunaway et al.
patent: 4900619 (1990-02-01), Ostrowski et al.

Affiliated with

Also associated with

Rating

Controlled-porosity, calendered spunbonded/melt blown laminates does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Controlled-porosity, calendered spunbonded/melt blown laminates, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Controlled-porosity, calendered spunbonded/melt blown laminates will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-2113849