B - Operations – Transporting – 65 – H
Patent
B - Operations, Transporting
65
H
B65H 75/10 (2006.01) B31C 3/00 (2006.01) B32B 1/08 (2006.01)
Patent
CA 2124700
The invention provides multi-grade spirally wound paperboard tubes of enhanced flat crush strength construction. The multi-grade spirally wound paperboard tubes of the invention include a plurality of structural paperboard plies having at least two predetermined densities including a lower density and a higher density wherein the higher density is at least about 3% greater than the lower density. The cylindrical bodywall is defined in radial cross section by at least one centrally located paperboard layer disposed between at least one radially inwardly located structural paperboard layer and at least one radially outwardly located structural paperboard layer. The centrally located paperboard layer is formed from the higher density paperboard and the inwardly and outwardly located structural paperboard layers are formed from lower density paperboard.
L'invention porte sur des tubes hélicoïdaux en carton de catégories multiples à résistance à la compression à plat améliorée. Ces tubes comprennent une série de couches structurales de carton présentant au moins deux densités prédéterminées incluant une densité inférieure et une densité supérieure qui est au moins 3 % plus élevée environ que la densité inférieure. La paroi corps cylindrique est définie, dans sa coupe transversale, par au moins une couche de carton centrale disposée entre au moins une couche structurale de carton interne et radiale et une couche structurale de carton externe et radiale. La couche centrale susmentionnée est construite à partir de carton de densité supérieure, et les couches interne et externe décrites plus haut sont construites à partir de carton de densité inférieure.
Gerhardt Terry D.
Johnson Charles G.
Mccarthy Monica
Wang Yiming
Sim & Mcburney
Sonoco Products Company
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