Melt-blowing die for producing nonwoven mats
CA 1077211 A · Owner: Esso Research And Engineering Company · Inventors: Buntin, Robert R.; Keller, James P.; Harding, John W.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A die having a special nose configuration approximating a triangle in cross section is especially suitable for use in a melt-blowing process for making very fine fibers from thermoplastic materials. A plurality of orifices are located in an edge-apex. The included angle encompassing said edge is within the range of 30° to 90°. The essential feature of said edge is that there are essentially no dead spaces where polymer can collect during the melt-blowing process with the absence of any point on the edge which is more than about 0.002" (2 mils) from where the sides make initial contact with said edge. Another feature of the invention involves air slot adjustment means in combination with …
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Listed from its CIPO record in Patent Yard's archive of Canadian patents past their term. Its claims, description and drawings are in the CIPO record and on Google Patents, and the Claude kit works from them.
Why it's free to use
- Granted May 13, 1980. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended May 13, 1997.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
Timeline
Timeline From CIPO dates
Sources & verification
Official CIPO records
Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.