Paper making and fiber liberation – Processes and products – Non-uniform – irregular or configured web or sheet
Patent
1996-07-11
1998-12-15
Theisen, Mary Lynn
Paper making and fiber liberation
Processes and products
Non-uniform, irregular or configured web or sheet
162147, 162149, 162175, 264 86, 264115, 264DIG69, D21H 1100
Patent
active
058491520
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a process for the production of shaped bodies, in particular packaging shaped bodies, from biodegradable (biologically decomposable) material and a shaped body produced according to this process. This invention relates in particular to a process for the production of shaped bodies to be used as recyclable, biodegradable packages which contain biologically decomposable fiber material.
A large quantity of waste paper and cellulose fiber containing and starch containing scrap material accumulates in household and industry. For reasons of environmental production and the protection of natural resources recycled waste paper is also increasing by used as a starting material for paper production.
On the other hand, there is the urgent need, in particular in the field of packages, but also in other fields, to also use shaped bodies which only make demands on the waste industry to a small degree, which are disintegratabie (recyclable) for reuse and are e.g. substantially biodegradable (biologically decomposable) in non-residue fashion e.g. within the scope of composting. Consequently, waste paper and cellulose-fiber- and starch-containing scrap material such as wood dust or paper dust and also de-inked waste paper (de-inking material) also come into consideration as basic materials for the production of shaped bodies as packaging means. For the packaging of foodstuff, products produced from recycled waste paper are subjected to a special surface treatment in order to comply with hygiene requirements. If unsoiled waste paper from industrial processing is exclusively used, such a treatment can be omitted if legally stipulated basic production conditions are observed.
Consequently, flat trays or covers made of cardboard produced with the exclusive or partial use of waste paper are known. This cardboard is punched and shaped by means of corresponding dies. However, there are narrow limits to the obtainable abundance of shapes due to the nature of the material, since cardboard can only be shaped to a very limited extent.
To avoid this disadvantage, shaped packages are being increasingly produced according to the fiber casting process, which is based on the fundamentals of conventional paper production. Fiber suspensions of comminuted waste paper and water are prepared and placed on shaped sieves. Subsequently, water is extracted and the shaped article is dried; it can possibly also be subjected to a compressing pressing treatment. It is disadvantageous that the carrying out of this process as it is e.g. known from DE 40 35 887 is very expensive and has an impact on the environment due to the great water requirements. Quite recently, it was also attempted to replace shaped packages made from plastic material and particularly suited for the packaging of foodstuffs with products on the basis of waste paper.
The production of a multi-layer packaging tray for foodstuffs is e.g. known from DE-OS 39 23 497, whose carrier layer consists predominantly of recycling material on the basis of waste paper. A share of foamed plastic material is necessary here as a binding agent. The production of such packaging trays requires a relatively expensive, multi-stage process, in which comminuted waste paper material is guided via an extruder to a web-shaped carrier layer and subsequently is shaped to packaging trays together with a cover layer by means of deep drawing or pressing, respectively. During production, a controlled, metered addition of plastic granulates into the carrier layer as a binding agent must be effected. Due to the use of plastic material such as a packaging tray is detrimentally not comprised of completely decomposable, organic material. Moreover, the production is cost-intensive due to the expensive operation sequence.
Packages on the basis of waffle dough, both as edible packages and, as a function of the used additives, as non-edible packages are also known (EP 513 106). There are difficulties as regards longevity, elasticity, breaking strength and durability of such packages.
Finally, it is
REFERENCES:
patent: 4377440 (1983-03-01), Gasland
patent: 4508595 (1985-04-01), Gasland
patent: 5582682 (1996-12-01), Ferretti
Arnold Gerd
Buettner Erhard
Dubbert Frank
Gass Christian
Koeblitz Thomas
Rapido Waagen- und Maschinenfabrik GmbH
Theisen Mary Lynn
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