Stock material or miscellaneous articles – Hollow or container type article – Paper containing
Patent
1993-11-15
1996-05-07
Robinson, Ellis P.
Stock material or miscellaneous articles
Hollow or container type article
Paper containing
428 3691, 4283148, 428326, 428327, 428342, 428906, 138132, 138137, 242610, 162121, 162122, 162127, 1621641, B65H 7508
Patent
active
055144292
ABSTRACT:
A cylindrical composite paperboard cushion core for winding a sheet material therearound without forming undesirable stepwise marks thereon, comprises a cylindrical paperboard substrate and a cushion layer formed on the cylindrical paperboard substrate from an expanded paper sheet having a density of 0.1 to 0.4 g/cm.sup.3, the expanded paper sheet being formed by forming an unexpended paper sheet containing therein a plurality of expansible microcapsules each having a volatile liquid core contained in a thermoplastic resin shell and capable of starting an expansion at a temperature of 80.degree. C. to 200.degree. C., and heating the unexpanded paper sheet at the expansion-starting temperature of the microcapsules or higher, to cause the paper sheet to be expanded.
REFERENCES:
patent: 3556934 (1971-01-01), Meyer
patent: 4133688 (1979-01-01), Sack
patent: 4379729 (1983-04-01), Cross
patent: 4745097 (1988-05-01), Maekawa et al.
European Search Report for application 93118445.1 dated Mar. 24, 1994.
Kamihgaraguchi Hiromi
Shigetani Tsunehisa
Dye Rena L.
New Oji Paper Co. Ltd.
Robinson Ellis P.
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