CPC F16L 59/075 (2013.01) [B32B 1/02 (2013.01); B32B 7/05 (2019.01); B32B 7/12 (2013.01); B32B 29/005 (2013.01); B32B 29/08 (2013.01); B32B 37/0046 (2013.01); B32B 37/1207 (2013.01); B32B 37/20 (2013.01); B32B 38/0004 (2013.01); F16L 59/029 (2013.01); B32B 2037/1215 (2013.01); B32B 2250/26 (2013.01); B32B 2255/12 (2013.01); B32B 2255/26 (2013.01); B32B 2307/304 (2013.01); B32B 2307/558 (2013.01); B32B 2307/56 (2013.01); B32B 2307/718 (2013.01); B32B 2307/732 (2013.01); B32B 2309/14 (2013.01); B32B 2317/127 (2013.01); B32B 2439/06 (2013.01); B32B 2439/62 (2013.01); B32B 2553/02 (2013.01)] | 20 Claims |
1. A method of forming an insulation product, comprising:
forming a continuous sheet of paper into a plurality of flexible loops defining a plurality of air channels extending in a direction that is substantially perpendicular with a machine direction of the continuous sheet of paper; and
immediately attaching a first layer of paper and a second layer of paper to the plurality of flexible loops as they are formed so that the continuous sheet of paper retains the plurality of flexible loops between the first layer and the second layer and that the plurality of flexible loops remain unattached with respect to one another.
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