Coating processes – With post-treatment of coating or coating material – Heating or drying
Patent
1995-05-31
1996-11-19
Bell, Janyce
Coating processes
With post-treatment of coating or coating material
Heating or drying
427394, 427230, B05D 302
Patent
active
055760490
DESCRIPTION:
BRIEF SUMMARY
It is an object of the present invention to provide shaped elements, such as cups, plates, boxes, generally containers of various types, as well as sheets, mats and films, which are rottable, on the one hand, and on the other hand are water-repellent to watertight at least in the regions in which they are contacted by the products to be received.
A large number of such products are presently made from no n-renewable raw materials by technologies which are likely to cause malfunctions and t heir use results in an increase of the volume of long-lasting solid waste materials. This gives rise to problems which relate to raw materials, environmental conditions and the disposal of waste materials so that it is necessary to pro vide alternative products which are more compatible ecologically. For instance, bulky and durable plastic packages are used with foodstuffs, particularly for immediate consumption. Whereas such plastic packages are relatively light in weight, they occupy a considerable volume in the garbage container and in the dump and may sometimes be carried away by the wind. If they are simply thrown away in case of their outdoor consumption, they will mar the environment often for years. In addition to said problems regarding disposal, the consumption of increasingly scarer fossil raw materials and the transportation and production risks are significant.
Various renewable raw materials may be used in principle to substitute fossil raw materials in the production of materials and the manufacture of-rottable products and most of them belong to the groups consisting of the carbohydrates, fats, and proteins. Whereas carbohydrates having a low molecular weight ("sugars"), fats and proteins are mainly used in foodstuffs, considerable production capacities for and resources of polysaccharides, such as cellulose and quickly renewable starch, are available for replacing of fossil raw materials.
As regards starch as a base material, a number of packaging products have been developed only in the last decades. Such shaped elements are made, e.g., in that they are baked between two mold halves or in that starch-containing compositions are extruded.
Shaped elements made by a baking of starch-containing compositions have been described in U.S. Pat. No. 5,376,320.
In the process described there, a tough, strong product having a high stability is obtained in that prepared from the following ingredients: weight, particularly 44 to 49% by weight, of a starch or a mixture of different starches and/or a flour or flour mixture; weight, of one or more fatty acids having medium or long chain lengths and being optionally substituted and/or of their salts and/or of their acid derivatives, such as acid amides; said components may optionally be supplemented or replaced in part or, in individual cases, entirely replaced by 0.5 to 6.5% by weight, preferably 0.1 to 4.2% by weight, polymethylhydrogensiloxanes, and where both groups of compounds are us ed in conjunction with high concentrations of fatty acids the concentration of polymethylhydrogensiloxanes should not exceed 3% by weight, as a rule; agent, particularly 1.0 to 5.5% by weight dried gelatinized starch, pregelatinized starch or waste baked products, and/or 0 to 2% by weight, preferably 0 to 1.0% by weight, guar meal, pectin, carubine, carboxymethyl cellulose and/or 0 to 5.5% by weight, preferably 0 to 3% by weight, gum arabic; material, in case of pulp up to 26,9% by weight and/or other plant fibers and/or fibers of plastic, glass, metal, carbon and others; such as calcium carbonate, coal, talc, titanium dioxide, silica gel, alumina; 0 to 3% by weight, preferably 0 to 2.5% by weight, shellac; 0 to 2.0% by weight, preferably 0 to 1.0% by weight, soybean protein, wheat gluten powder, chicken protein powder, casein powder, caseinate powder; common salt and/or 0 to 2.5% by weight, preferably 0 to 1.5% by weight, glycerine, glycols and/or 0 to 4.5% by weight, preferably 0 to 3.5% by weight, sorbitol; weight, inorganic pigments and/or 0 to 0.1% by weight natural and synthetic
REFERENCES:
patent: 5376320 (1994-12-01), Tiefenbacher et al.
Haas Franz
Haas Johann
Tiefenbacher Karl
Bell Janyce
Franz Haas Waffelmaschinen Industriegesellschaft m.b.H.
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