WHITE CARDBOARD FOR FOOD CONTAINER

• Main Author: OUGIMOTO MASATO
• Format: Patent
• Language: English
• Published: 06.08.1996
• Edition: 6
• Subjects: ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS,e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES,DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; CONVEYING; HANDLING THIN OR FILAMENTARY MATERIAL; IMPREGNATING OR COATING OF PAPER; LAYERED PRODUCTS; LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT ORNON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM; PACKAGES; PACKAGING ELEMENTS; PACKING; PAPER NOT OTHERWISE PROVIDED FOR; PAPER-MAKING; PERFORMING OPERATIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; PRODUCTION OF CELLULOSE; PULP COMPOSITIONS; STORING; TEXTILES; TRANSPORTING; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G

PURPOSE: To obtain white cardboard for a food container enabled in recycling, prevented from the lowering of strength and preventing the bleeding of oil and moisture by laminating a rear under layer, a core layer and a surface layer successively from the side of the rear layer becoming the inner surface of the food container. CONSTITUTION: A rear under layer 2, a core layer 3 and a surface layer 4 becoming an outer surface are successively laminated from the side of the rear layer 1 becoming the inner surface of a food container. The rear layer 1 is pref. formed from chemical pulp because it comes into contact with food directly and keeps water absorbability and oil absorbability. The rear under layer 2 has water and oil resistance in order to prevent the moisture or oil absorbed by the rear layer 1 from penetrating into the core layer 3. The core layer 3 is formed by using deinked pulp or old paper and strong sizing is applied to the core layer 3 to impart water resistance thereto so as to prevent such a phenomenon that steam generated from food is liquefied in the core layer 3 to be bonded to fibers to lower strength. Further, the surface layer 4 is formed by mainly using chemical pulp in order to ensure aesthetic properties, printability or the like and strong sizing is applied to the surface layer 4 to impart water resistance thereto.