Stock material or miscellaneous articles – Hollow or container type article – Paper containing
Patent
1993-12-10
1996-02-13
Loney, Donald J.
Stock material or miscellaneous articles
Hollow or container type article
Paper containing
428182, 428332, 4285375, 206423, 162158, 162161, 1621682, 1621646, B29D 2200, B65D 8550, D21H 1100
Patent
active
054910080
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
This invention relates to cellulose-based package materials having an increased adsorption capacity and to a process for their manufacture. The package materials can particularly be used as containers for rapidly perishable fruits and vegetables (greens).
BACKGROUND OF THE INVENTION
A high number of methods--from cooling the items (products) to the use of plastic foils, wrappings, combined package materials with various adsorption capacity for specific gas permeability became--known in order to retard the ripening and for preserving the freshness, taste and texture of rapidly perishable fresh fruits and other vegetables. In many cases, the fruits or vegetables to be stored are treated by germicidal agents, microwave irradiation or chemicals.
Due to the hygienic prescriptions continuously becoming more and more severe it is aimed to retard the ripening of products by combining adsorptive substances of natural origin (e.g. activated carbon) with traditional package materials such as cardboard boxes and simultaneously to omit the treatment of the product to be stored in the packing of rapidly perishable foods, particularly fruits and vegetables.
It is also known that during the ripening and storage of fruits various amounts of gases and vapours having various compositions are liberated, by the enrichment of which in a closed container the ripening is accelerated and therefore, a rapid deterioration of the products to be stored is induced. Adsorbents applied to the space closed by the storage unit or container e.g. zeolites, activated carbon, silica gel, resp., are capable of retarding the ripening, or deterioration of items to a certain extent by the partial binding of the gases and vapours. However, the adsorbents used cannot be applied durably onto the surface of the known fruit package materials therefore, their use is cumbersome and laboursome.
It has also become known that the mixed potassium, sodium, magnesium or ammonium salts of humic acid as well as of nitrohumic acid prepared by the reaction of humic acid with nitric acid, which are utilized in the therapy and in the cosmetic industry, possess some activity in inhibiting rot and zymosis, and thus, they can be utilized as adsorbents applied with the package materials in the storage of fruits. The salts of humic and particularly nitrohumic acid have been used in a form filled onto or applied to felt, polyethylene foam net or paper bag and a certain grade of freshness-preserving effectivity was observed in the case of storage of fruits [C. A. 111, 76736 (1989); Japanese Pat. 64. 02,528].
SUMMARY OF THE INVENTION
The present invention has as its objective the provision of a cellulose-based package material having an increased adsorption capacity for packing fresh fruits, vegetables and green products (flowers and the like), which package materials retards the ripening and permits prolonging of the storage-life of such items while preserving their original quality.
DETAILED DESCRIPTION OF THE INVENTION
There is provided according to the present invention a cellulose-based package material having an increased adsorption capacity which has been treated in its substance or on its surface in a permanent manner with an aqueous suspension containing a mixture of fulvic acid and humic acid or their salts. The cellulose-based package material is paper, cardboard, corrugated paper board or an other cellulose-based laminated product. During the preparation of these, the suspension containing the mixture of fulvic acid and humic acid is bound to the cellulose fibres in a technological step of the paper industry, or to the cellulose fibres during sizing when fibres are still in an active wet state. The mixture of fulvic acid and humic acid is bound to the cellulose fibres by itself or mixed with other additives (auxiliaries) used in the paper industry and the final product is dried in a subsequent step.
The suspension according to the invention, which contains a mixture of fulvic acid and humic acid and is suitable to be fixed to the
REFERENCES:
patent: 4533435 (1985-08-01), Intili
patent: 5005760 (1991-04-01), Van den Hoogen
patent: 5121877 (1992-06-01), Bodary et al.
Chemical Abstracts, vol. III, No. 9, Aug. 28, 1989, M. Uemura et al "Nitrohumic acids as preservatives for fruits and vegetables and Method of Application".
Chemical Abstracts, vol. 82, No. 19, May 12, 1975 M. Saeki et al "Preservatives of Cut Flowers by Nitrohumates".
Joo Gabor
Toth Laszlo
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