B - Operations – Transporting – 29 – C
Patent
B - Operations, Transporting
29
C
B29C 70/02 (2006.01) B05B 11/00 (2006.01) B29C 43/00 (2006.01) B29C 43/34 (2006.01) B29C 47/00 (2006.01) B29C 47/50 (2006.01) B29C 47/52 (2006.01) B29C 55/18 (2006.01) B29D 7/01 (2006.01) B32B 27/20 (2006.01) B32B 37/14 (2006.01) C04B 26/00 (2006.01) C08J 5/04 (2006.01) C08L 3/02 (2006.01) B05C 5/02 (2006.01)
Patent
CA 2248982
Compositions and methods for manufacturing sheets having a starch-bound matrix reinforced with fibers and optionally including an inorganic mineral filler. Suitable mixtures for forming the sheets are prepared by mixing together water, unmodified and ungelatinized starch granules, a cellulosic ether, fibers, and optionally an inorganic mineral filler in the correct proportions to form a sheet having desired properties. The mixtures are formed into sheets by passing them between one or more sets of heated rollers to form green sheets. The heated rollers cause the cellulosic ether to form a skin on the outer surfaces of the sheet that prevents the starch granules from causing the sheet to adhere to the rollers upon gelation of the starch. The green sheets are passed between heated rollers to gelatinize the starch granules, and then to dry the sheet by removing a substantial portion of the water by evaporation. The starch and cellulosic ether form the binding matrix of the sheets with the fibers and optional inorganic filler dispersed throughout the binding matrix. The starch- bound sheets can be cut, rolled, pressed, scored, perforated, folded, and glued to fashion articles from the sheets much like paper or paperboard. The sheets are particularly useful in the mass production of containers, such as food and beverage containers.
L'invention a trait à des procédés permettant la fabrication de feuilles pourvues d'une matrice, utilisant l'amidon comme liant, renforcée par des fibres et comportant, éventuellement, une matière de charge inorganique minérale. On élabore des mélanges convenant à la constitution de ces feuilles en mélangeant (10) de l'eau, des granules d'amidon non mofifié et non gélifié, un éther cellulosique, des fibres et, éventuellement, une matière de charge inorganique minérale et ce, dans des proportions qui permettent la constitution de feuilles dotées des propriétés voulues. On forme les feuilles à partir de ces mélanges en les passant entre un ou plusieurs ensembles de cylindres chauffés (40) d'où sortent des feuilles crues. Du fait de son passage entre des cylindres chauffés (40), l'éther cellulosique forme une peau sur les faces de la feuille, ce qui empêche les granules d'amidon de provoquer, après gélification, une adhérence de la feuille sur les cylindres (40), le passage des feuilles crues entre les cylindres (50) ayant justement pour but de gélifier les granules d'amidon. On sèche ensuite ces feuilles par évaporation d'une partie importante de l'eau qu'elles renferment.
Anderson Per J.
Christensen Bruce J.
Hodson Simon K.
Ong Shaode
Cassan Maclean
E. Khashoggi Industries Llc
E. Khashoggi Industries Llc.
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