Akzo Nobel N.v.

Akzo N.v.

Hans-Gunther Breidohr

Michael Pelger

Manfred Martin

Heinz Stemig

Panajotis Argyriadis

August Stoldt

Properties of cellulosic membranes such as the length and the ultrafiltration rate are stabilized by warmth/humidity conditioning, whereby temperatures in a range of about 30.degree. to 60.degree. C. and relative humidities in a range of about 10 to 60% are suitable. The membranes may be enveloped at a relative humidity of about 40 to 60% and at about 20.degree. to 25.degree. C. in a packaging which is at least substantially impermeable to the passage of moisture before being subjected to the conditioning.

Process for the stabilization of the properties of cellulosic membranes

A hollow thread bundle for material and/or heat exchange has a plurality of substantially parallel hollow threads of substantially equal length, and a sewing seam wrapping around the plurality of hollow threads and including at least one sewing thread. The hollow thread bundle can be produced by wrapping the plurality of hollow threads by a sewing seam including at least one sewing thread.

Hollow thread bundle and method of its manufacture

Growing community of inventors

Wuppertal, Germany

Hans-Gunther Breidohr