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US 6,274,077 B1Granted
Manufacturing method for a buffer and heat-insulating material made of a foamed cellulose substance
AssigneeDaewon Paptin Foam Co., Ltd.
InventorsBang-Uk Hur, Yoo-Byung Bark
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Abstract
The present invention relates to an improved manufacturing method of a buffer and heat-insulating material made of foamed cellulose substance, wherein cellulose material is heated homogeneously in a microwave oven to be foamed homogeneously and thus when dried the foamed product is not deformed, whereby an excellent buffer and heat-insulating material is obtained.
Claims4
A method of producing a foamed heat-insulating material which is comprised of a cellulose substance that functions as a buffer material comprising the following steps:
- a) heating a cellulose or waste paper material;
- b) dehydrating said material to obtain a material having a water content of about 25 weight percent;
- c) mixing the dehydrated material with adhesives and foaming agents;
- d) preheating the resulting premix to a temperature of 50-100° C.;
- e) injecting the preheated mixture into a mold;
- f) treating the injected material with microwave irradiation to produce a homogenous foam material;
- and
- g) drying the resultant foam material by use of P.T.C. (positive temperature co-efficiency resistor) at a temperature of 50-100° C.
5 more elements
Dependencies are inferred from the claim text.