B - Operations – Transporting – 29 – C
Patent
B - Operations, Transporting
29
C
B29C 65/00 (2006.01) B29C 65/02 (2006.01) B32B 27/12 (2006.01) D04H 13/00 (2006.01) D04H 3/14 (2006.01)
Patent
CA 2397547
There is disclosed a heat-sealing method including: feeding a fusible fiber sheet (12) into the clearance between a pair of rolls (1, 5), at least one of which has sealing ridges (2, 6) of a predetermined pattern on its outer circumference; and heating and pressing the fiber sheet (12) with the sealing ridges (2, 6), to form fused portions corresponding to the pattern of the sealing ridges (2, 6), in the fiber sheet (12). An insulator (4) is disposed to cover the outer circumference of the rolls (1, 5), as lacking the sealing ridges. The insulator (4) is made of a material which has a lower thermal conductivity than that of the sealing ridges and which can be elastically contracted by the pressure of the rolls (1, 5). The fiber sheet (12) to be fed into the clearance between the rolls (1, 5) rotating is compressed by the insulator (4) to discharge its internal air and is then heated and pressed by the sealing ridges (2, 6) so that it is heat-sealed.
Procédé de thermoscellage qui consiste à introduire une feuille (12) de fibres fusibles dans le point de contact entre deux cylindres (1, 5) dont l'un au moins comporte des nervures (2, 6) de scellage présentant un motif prédéterminé sur sa circonférence externe, puis à chauffer et à comprimer la feuille (12) de fibres à l'aide des nervures (2, 6) de scellage pour former dans ladite feuille (12) des parties soudées correspondant au motif desdites nervures (2, 6). Un élément isolant (4) est placé de manière à couvrir la circonférence externe des cylindres (1, 5), mais non les nervures de scellage. Ledit élément isolant (4) est constitué d'une matière qui possède une conductivité thermique inférieure à celle des nervures de scellage et qui peut être élastiquement comprimée par la pression des cylindres (1, 5). La feuille (12) de fibres à introduire dans le point de contact entre les cylindres (1, 5) en rotation est comprimée par l'élément isolant (4), ce qui la débarrasse de l'air qu'elle contient, puis elle est chauffée et pressée contre les nervures (2, 6) de manière à être thermosoudée.
Kenmochi Yasuhiko
Tanaka Yoshinori
Mcfadden Fincham
Uni-Charm Corporation
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