IL103533A - Cellulose-based package material having an increased adsorption capacity and its manufacture - Google Patents
Cellulose-based package material having an increased adsorption capacity and its manufactureInfo
- Publication number
- IL103533A IL103533A IL10353392A IL10353392A IL103533A IL 103533 A IL103533 A IL 103533A IL 10353392 A IL10353392 A IL 10353392A IL 10353392 A IL10353392 A IL 10353392A IL 103533 A IL103533 A IL 103533A
- Authority
- IL
- Israel
- Prior art keywords
- cellulose
- package material
- based package
- colloidal solution
- mixture
- Prior art date
Links
- 239000000463 material Substances 0.000 title claims description 48
- 229920002678 cellulose Polymers 0.000 title claims description 28
- 239000001913 cellulose Substances 0.000 title claims description 28
- 238000004519 manufacturing process Methods 0.000 title claims description 12
- 238000001179 sorption measurement Methods 0.000 title claims description 12
- 239000000123 paper Substances 0.000 claims description 29
- 239000004021 humic acid Substances 0.000 claims description 23
- 239000002509 fulvic acid Substances 0.000 claims description 22
- 239000000203 mixture Substances 0.000 claims description 22
- QJZYHAIUNVAGQP-UHFFFAOYSA-N 3-nitrobicyclo[2.2.1]hept-5-ene-2,3-dicarboxylic acid Chemical compound C1C2C=CC1C(C(=O)O)C2(C(O)=O)[N+]([O-])=O QJZYHAIUNVAGQP-UHFFFAOYSA-N 0.000 claims description 21
- PUKLDDOGISCFCP-JSQCKWNTSA-N 21-Deoxycortisone Chemical compound C1CC2=CC(=O)CC[C@]2(C)[C@@H]2[C@@H]1[C@@H]1CC[C@@](C(=O)C)(O)[C@@]1(C)CC2=O PUKLDDOGISCFCP-JSQCKWNTSA-N 0.000 claims description 19
- FCYKAQOGGFGCMD-UHFFFAOYSA-N Fulvic acid Natural products O1C2=CC(O)=C(O)C(C(O)=O)=C2C(=O)C2=C1CC(C)(O)OC2 FCYKAQOGGFGCMD-UHFFFAOYSA-N 0.000 claims description 19
- 229940095100 fulvic acid Drugs 0.000 claims description 19
- 239000000725 suspension Substances 0.000 claims description 18
- 238000000034 method Methods 0.000 claims description 13
- 239000000835 fiber Substances 0.000 claims description 12
- 230000008569 process Effects 0.000 claims description 11
- 150000003839 salts Chemical class 0.000 claims description 9
- 229920003043 Cellulose fiber Polymers 0.000 claims description 8
- 239000000126 substance Substances 0.000 claims description 8
- 238000001035 drying Methods 0.000 claims description 6
- 239000002245 particle Substances 0.000 claims description 6
- 239000011111 cardboard Substances 0.000 claims description 4
- 238000000921 elemental analysis Methods 0.000 claims description 4
- 239000003077 lignite Substances 0.000 claims description 4
- 239000002994 raw material Substances 0.000 claims description 3
- 238000012545 processing Methods 0.000 claims description 2
- 238000010521 absorption reaction Methods 0.000 claims 1
- 235000013399 edible fruits Nutrition 0.000 description 18
- 239000000243 solution Substances 0.000 description 13
- 238000003860 storage Methods 0.000 description 12
- 230000005070 ripening Effects 0.000 description 9
- 235000001674 Agaricus brunnescens Nutrition 0.000 description 8
- 239000000654 additive Substances 0.000 description 7
- 239000007789 gas Substances 0.000 description 7
- 239000000047 product Substances 0.000 description 7
- 238000004513 sizing Methods 0.000 description 7
- 230000000996 additive effect Effects 0.000 description 5
- 230000000694 effects Effects 0.000 description 5
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 4
- CXKWCBBOMKCUKX-UHFFFAOYSA-M methylene blue Chemical compound [Cl-].C1=CC(N(C)C)=CC2=[S+]C3=CC(N(C)C)=CC=C3N=C21 CXKWCBBOMKCUKX-UHFFFAOYSA-M 0.000 description 4
- 229960000907 methylthioninium chloride Drugs 0.000 description 4
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 3
- XEKOWRVHYACXOJ-UHFFFAOYSA-N Ethyl acetate Chemical compound CCOC(C)=O XEKOWRVHYACXOJ-UHFFFAOYSA-N 0.000 description 3
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 description 3
- 239000002253 acid Substances 0.000 description 3
- 239000003463 adsorbent Substances 0.000 description 3
- 239000007900 aqueous suspension Substances 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 3
- 238000009826 distribution Methods 0.000 description 3
- 238000002474 experimental method Methods 0.000 description 3
- 239000011087 paperboard Substances 0.000 description 3
- AKHNMLFCWUSKQB-UHFFFAOYSA-L sodium thiosulfate Chemical compound [Na+].[Na+].[O-]S([O-])(=O)=S AKHNMLFCWUSKQB-UHFFFAOYSA-L 0.000 description 3
- 235000019345 sodium thiosulphate Nutrition 0.000 description 3
- 235000013311 vegetables Nutrition 0.000 description 3
- ZCYVEMRRCGMTRW-UHFFFAOYSA-N 7553-56-2 Chemical compound [I] ZCYVEMRRCGMTRW-UHFFFAOYSA-N 0.000 description 2
- 244000144730 Amygdalus persica Species 0.000 description 2
- 102000004190 Enzymes Human genes 0.000 description 2
- 108090000790 Enzymes Proteins 0.000 description 2
- 235000016623 Fragaria vesca Nutrition 0.000 description 2
- 235000011363 Fragaria x ananassa Nutrition 0.000 description 2
- 235000018290 Musa x paradisiaca Nutrition 0.000 description 2
- 235000006040 Prunus persica var persica Nutrition 0.000 description 2
- 229920002472 Starch Polymers 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 230000006866 deterioration Effects 0.000 description 2
- 238000000605 extraction Methods 0.000 description 2
- 235000021022 fresh fruits Nutrition 0.000 description 2
- 235000012055 fruits and vegetables Nutrition 0.000 description 2
- 230000002401 inhibitory effect Effects 0.000 description 2
- 229910052740 iodine Inorganic materials 0.000 description 2
- 239000011630 iodine Substances 0.000 description 2
- 230000003647 oxidation Effects 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- 238000012856 packing Methods 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 102000004169 proteins and genes Human genes 0.000 description 2
- 108090000623 proteins and genes Proteins 0.000 description 2
- 230000002829 reductive effect Effects 0.000 description 2
- 239000008107 starch Substances 0.000 description 2
- 235000019698 starch Nutrition 0.000 description 2
- 238000003786 synthesis reaction Methods 0.000 description 2
- 244000251953 Agaricus brunnescens Species 0.000 description 1
- DKPFZGUDAPQIHT-UHFFFAOYSA-N Butyl acetate Natural products CCCCOC(C)=O DKPFZGUDAPQIHT-UHFFFAOYSA-N 0.000 description 1
- 244000307700 Fragaria vesca Species 0.000 description 1
- 240000009088 Fragaria x ananassa Species 0.000 description 1
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 description 1
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 1
- 241000234295 Musa Species 0.000 description 1
- 240000008790 Musa x paradisiaca Species 0.000 description 1
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 description 1
- 239000004698 Polyethylene Substances 0.000 description 1
- ZLMJMSJWJFRBEC-UHFFFAOYSA-N Potassium Chemical compound [K] ZLMJMSJWJFRBEC-UHFFFAOYSA-N 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 description 1
- 230000000274 adsorptive effect Effects 0.000 description 1
- 159000000013 aluminium salts Chemical class 0.000 description 1
- 229910000329 aluminium sulfate Inorganic materials 0.000 description 1
- DIZPMCHEQGEION-UHFFFAOYSA-H aluminium sulfate (anhydrous) Chemical compound [Al+3].[Al+3].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O DIZPMCHEQGEION-UHFFFAOYSA-H 0.000 description 1
- 235000011128 aluminium sulphate Nutrition 0.000 description 1
- 150000003863 ammonium salts Chemical class 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 239000011247 coating layer Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 239000012467 final product Substances 0.000 description 1
- 239000006260 foam Substances 0.000 description 1
- 239000011888 foil Substances 0.000 description 1
- 235000013305 food Nutrition 0.000 description 1
- 238000001502 gel electrophoresis Methods 0.000 description 1
- 230000002070 germicidal effect Effects 0.000 description 1
- 235000021384 green leafy vegetables Nutrition 0.000 description 1
- FUZZWVXGSFPDMH-UHFFFAOYSA-N hexanoic acid Chemical compound CCCCCC(O)=O FUZZWVXGSFPDMH-UHFFFAOYSA-N 0.000 description 1
- 239000003864 humus Substances 0.000 description 1
- 230000002045 lasting effect Effects 0.000 description 1
- 239000011777 magnesium Substances 0.000 description 1
- 229910052749 magnesium Inorganic materials 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910017604 nitric acid Inorganic materials 0.000 description 1
- 230000036284 oxygen consumption Effects 0.000 description 1
- 239000010893 paper waste Substances 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- -1 polyethylene Polymers 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
- 229910052700 potassium Inorganic materials 0.000 description 1
- 239000011591 potassium Substances 0.000 description 1
- 230000007065 protein hydrolysis Effects 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 230000000241 respiratory effect Effects 0.000 description 1
- 239000000741 silica gel Substances 0.000 description 1
- 229910002027 silica gel Inorganic materials 0.000 description 1
- 229910052708 sodium Inorganic materials 0.000 description 1
- 239000011734 sodium Substances 0.000 description 1
- 239000011343 solid material Substances 0.000 description 1
- 239000007858 starting material Substances 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 238000002560 therapeutic procedure Methods 0.000 description 1
- 239000010457 zeolite Substances 0.000 description 1
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W90/00—Enabling technologies or technologies with a potential or indirect contribution to greenhouse gas [GHG] emissions mitigation
- Y02W90/10—Bio-packaging, e.g. packing containers made from renewable resources or bio-plastics
Landscapes
- Storage Of Fruits Or Vegetables (AREA)
Description
¾-mn nrrao lena yz ,r Nn by ooiann πτηκ mm Cellulose-based package material having an increased adsorption capacity and its manufacture DUNAPACK RT. Csepeli Papirgyara C. 87768 103533/2 - 1 - CELLULOSE-BASED PACKAGE MATERIAL HAVING AN INCREASED ADSORPTION CAPACITY AND PROCESS FOR THE MANUFACTURE THEREOF This invention relates to cellulose-based package material 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).
A high number of methods - from cooling the items (products) to the use of plastic foils, wrappings, combined package materials with various adsorption capacity of 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 proscriptions 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 the 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 to retard 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 cosmetical industry, possess also some activity inhibiting the rot and zymosis and thus, they can be utilized as adsorbents applied beside 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 fC . A. 111, 76736 (1989); Japanese Pat. 64. 02,5287.
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 permi to prolong the storage-life of the items while preserving their original quality.
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 by 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 in 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 cellulose fibres, is a purified colloidal solution preferably recovered from brown coal, lignite or turf by dispersing these raw materials in an alkaline medium at ambient temperature, the colloidal solution resulted containing , substantially particles with a size lower,- than 1 and a dry substance content of 4-5 % by weight and a strongly alkaline pH. The dry substance results in the following analysis: C: 40-42 ¾; H: 3.61-4.0 ¾; N: 0.73-1.0 ¾; 0: 42.0-44 ¾.
Due to the structural analogy between humic acids and fulvic acids, the higher proportion of fulvic acids in the mixture can be concluded by the statistical distribution of the elemental analysis fF . J. Stevenson: "Humus Chemistry, Genesis, Composition, Reactions", Wiley, New York (1982)7.
The process according to the invention for the preparation of cellulose-based package materials having an increased adsorption capacity is characterized by adding portionwise in the wet phase of the paper manufacture, in a quantity of at least 0.5 ¾ by weight, preferably 3-5 ¾ by weight of. a mixture of fulvic acid and humic acid as calculated for the dry material content of the paper to be manufactured in form of a colloidal aqueous solution to the fibre suspension or to the fibre web being present on the sizing press, then processing and drying the paper web to obtain sheet or (paper) boards in a known manner.
The aqueous suspension having an alkaline pH value and containing the mixture of fulvic acid and humic acid can portionwise be added together with the fillers in the wet phase of the paper manufacture during the sizing simultaneousl with the addition of additives (au iliaries) used in the paper industry.
The addition of the additive in the form of an aqueous colloidal solution containing the humic acid and fulvic acid in each case is carried out prior to the paper-drying step. The addition may be performed in the cellulose-manufacturing phase in the pulp mill where starting materials of paper industry are obtained, however, the treatment may be achieved also by immersing the paper web into an aqueous treating suspension, e.g. on the sizing press followed by drying. Metal salts, particularly aluminium salts used in the paper making favourably contribute to the fixation of humic acids and fulvic acids or their salts resp. to cellulose fibres .
The effectivity of the cellulose-based package materials having an increased adsorption capacity manufactured according to the invention, inter alia their capability to bind the gases and vapours liberated from fruits has been tested by fruit storage experiments. It is noted that the adhesiveness of the cellulose-based package materials is not influenced by the treatment according to the invention whereas * the strength of the paper product is enhanced by 20 %.
The process according to the invention is illustrated by the following Examples.
Example 1 The suspension suitable , for treating the cellulose-based paper materials was prepared with a dry material content of 4-5 ¾ by dispersing the raw material containing fulvic acid and humic acid in an alkaline medium at ambient temperature. According to the particle size distribution, the dark brown-coloured colloidal solution of 11-12 pH value contained particles of lower than 1 m in size in an amount of 65 % and between 1 ^um and 1.2 ,um in an amount of 23-25 ¾. The zeta potential of the dispersed particles was found to be -20 m . The suspension did not settle during storage, the colloidal particles could be sedimented only by applying about 15000 x g.
Values of elemental analysis calculated for the free acid and related to the solid material are as follows: C: 40.50 ¾ H: 3.61 % 0: 42.1 % N : 0.75 % Elemental analysis values cited in the literature are as follows: Fulvic acid Humic acid C: 40-50 % 50-60 % H: 4- 6 ¾ 4- 6 ¾ 0: 44-50 % 30-35 ¾ N: 1- 3 8 2- 6 % - 7 - 103533/2 The oxygen consumption of the suspension used was measured by an indirect method. Iodine solution was added to the suspension which was reduced according to the reaction: I2 2 Γ and the iodine not consumed in the oxidation was titrated to the end point by using 0.1 N sodium thiosulfate solution.
The consumption (given in ml) of 0.1 N sodium thiosulfate solution indicated the oxidation of the solution and is characteristic of the composition: Suspension used Consumption of 0.1 N , ., sodium thiosulfate so- lution (ml) 1 8:4 2 7.8 3 7.1 5 6.2 Example 2 100 g of cellulose-based fibre material (dry substance content) containing 30 % by weight of unbleached fir sulfate cellulose and 70% by weight of paper waste in a suspension of 5% by weight was ground to 24 SR°, then 2 g of Oynakoll HV strengthened resin were added as a solution of 4% by weight. Subsequently, 100 g of gelated starch with a dry material content of 1% by weight were portionwise added, the pH value of the mixture was adjusted to 4.5 by adding an aluminium sulfate solution of 12 Baum degrees and then 100 g of a mixture of fulvic acid and humic acid of 11.0 pH value with a dry material content of 5% by weight were added in a disintegrator under continuousl stirring. There- 'V. after, sheets were prepared in a laboratory sheet-forming device.
This example was repeated by using 50, 25 and 12.5 g, respectively of a suspension containing the mixture of fulvic acid and humic acid.
Example 3 The aqueous suspension according to Example 1 containing the mixture of fulvic acid and humic acid was portionwise added in an amount (dose) of 0.8 litre of suspension per 1 kg of fibre to a paper fibre suspension used as a coating layer for corrugated paper-box manufacture. In an other experiment the suspension containing the mixture of humic acid and fulvic acid was portionwise added on the sizing press instead of starch in an amount of 3-5% by weight calculated for the dry material content.
It was concluded that, when applied on the sizing press, a substantial part of the additive was fixed on the paper surface, whereas, when added to the fibre suspension, it was observed that the additive was nearly evenly distributed over the cross-section of the paper.
Example 4 The effect of the cellulose-based package material treated according to the invention was tested on fruits packed in corrugated cardboard boxes prepared with a coating paper obtained according to Example 3. Since the liberation of- gas was expected during the storage, the effect asserts itself in a closed container. The paper surface should be in contact with the atmosphere of the fruit during storage. It should be noted that no decrease of the adsorption capacity of an air-stored package material sample has been observed even after 6 months. Therefore, it can be expected that the specific inhibitory action of the treated paper is durable.
The functional properties, sizing, strength features (characteristics) and adhesiveness of the package material were not disadvantageously influenced by the additive introduced.
The reductive effect (capacity) of the paper treated with the additive according to the invention in comparison to an untreated paper was examined by determining its decolouring effect on methylene blue (according to the Hungarian standard MSZ No. 6230-57). The methylene blue solution was used in a concentration of 8 ug/ml with an adsorption c/maximum at 645 ^um.
Control and treated paper, respectively of 1 g each were placed in a flask of 100 ml volume, shaken together with 50 ml of aqueous methylene blue solution, allowed to stand for 15, 30 or 60 seconds, respectively and after extraction the solution was examined spectrophotometrically . The adsorbance of methylene blue, i.e. A,/lC was found to be 0.90 before the measurement.
After 15 30 60 seconds Untreated paper 0.66 0.52 0.49 Treated paper 0.47 0.33 0.31 According to the examination of the decolouring effect, a significant difference appeared between the treated and untreated sample after extraction lasting for a very short time.
Boxes of 225x165x110 mm in size were prepared from paper board treated according to the invention and from control paper board, respectively. The same weights of unripe peach, banana, ripe strawberry and mushroom, respectively were packed into the boxes and then stored at 20 °C for 0-14 days.
The concentrations of methanol, ethanol, ethyl acetate and butyl acetate in the closed storage atmosphere of the fruits were tested by using a Packard 5880 A type gas chromatograph . The outer appearance and change of fruits were visually observed.
Results : Strawberry (0.7 kg of fruit in each box) showed a shining red light in the treated box on the 5th day whereas the control was dull-red, shrivelled with many mouldy individual items .
Peach (0.75 kg of half-ripe fruit in each package material): the fruit stored for 10 days in the treated box was still greenish-coloured and the ripening process was perceptibly inhibited in comparison to the control .
Banana (0.8 kg of unripe, green-coloured fruit in each box): the control was yellowish on the 3rd day of storage and quite ripe-yellow on the 7th and 9th days whereas the fruit remained greenish and became slightly yellowish on its one side in the treated box .
Mushroom (0.25 kg of smaller items cultivated agaric (Agaricus bisporus) placed in each package material): the mushroom in the control box became brownish, the caps (pileus) of the mushrooms were strongly opened and the larger ones became mouldy up to the 7th day of storage. The caps of the mushrooms were hardly or not opened and no brown colour was observed in the treated box.
In the mushroom storage experiment, the hydrolysis of proteins occurred in the substance was followed by measuring the decrease in the weight and intensity of protein molecules. The distribution of mushroom proteins was determined by gel electrophoresis on SDS-(sodium decyl sul fate ) -poly aery 1-amide .
The respiratory intensity of fruits stored in several package materials were various. For this reason, the gas composition of the atmosphere in the container was not uniform but characteristic to the stored fruit' sorts .
In the control of ripening, the biochemical changes connected with the enzyme synthesis are essential. The package materials treated according to the invention obviously inhibits the enzyme synthesis and simultaneously the process of ripening.
Claims (7)
1. A cellulose-based package material having an increased absorption capacity, prepared by a process comprising the step of: treating cellulose fibers having in their substance, or on their surface, with an aqueous colloidal solution containing a mixture of fulvic acid and humic acid or a salt thereof, and wherein provided that the cellulose fibers have been treated with an aqueous colloidal solution containing the mixture of fulvic acid and humic acid, or the salt thereof, and wherein the solution has a dry material content of 4-5% by weight and a strongly alkaline pH value of 11-12.
2. The cellulose-based package material according to Claim 1, wherein the material is a paper, selected from a cardboard, a corrugated paper or a cellulose-based laminated product.
3. The cellulose-based package material according to Claim 1, wherein the cellulose fibers are treated with the aqueous colloidal solution during a wet phase techno-step of a paper manufacturing process the cellulose-based package material, and wherein the wet phase step occurs prior to a step of drying said cellulose-based package material.
4. The cellulose-based package material according to Claim 1, wherein the colloidal solution is a purified colloidal solution containing a mixture of fulvic acid and humic acid, which is obtained by digesting a raw material containing brown coal, lignite or turf in an alkaline medium at ambient temperature, to give particles being less than 1 micron in size, and, an elemental analysis of the dry digested material being as follows: C: 40-42%, H: 3.6-4.0%, N: 0.75-1.0%, O: 42.0-44.0%.
5. In a process for the manufacture of a cellulose-based package material having an increased adsorption capacity, which process comprises the improvement of carrying out the sequential steps of: - 14 - 103533/2 (a) adding to a fiber suspension or a fiber web during the manufacturing process of the cellulose-based package material, a colloidal solution containing a mixture of fulvic acid and humic acid, or a salt thereof, in a quantity of at least 0.5% by weight, as calculated on the dry material weight of the cellulose-based package material to be manufactured, and (b) drying the fiber suspension or the fiber web, and processing the same into said cellulose-based package material.
6. The process according to Claim 5, wherein the colloidal solution containing the mixture of fulvic acid and humic acid, or the salt thereof, is added to the fiber suspension or the fiber web in portion-wise manner during a wet phase step of the manufacturing process the cellulose-based package material, wherein the wet phase step occurs prior to a step of drying said cellulose-based package material.
7. The process according to Claim 5, wherein the colloidal solution contains a mixture of fulvic acid and humic acid or the salt thereof, in a quantity of 3-5% by weight, as calculated on the dry material weight of the cellulose-based package material to be manufactured. For the Applicants, DR. REINHOLD COHN AND PARTNERS 87768clm.GI/prg43: 17.9.1995
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| IL10353392A IL103533A (en) | 1992-10-23 | 1992-10-23 | Cellulose-based package material having an increased adsorption capacity and its manufacture |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| IL10353392A IL103533A (en) | 1992-10-23 | 1992-10-23 | Cellulose-based package material having an increased adsorption capacity and its manufacture |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| IL103533A0 IL103533A0 (en) | 1993-03-15 |
| IL103533A true IL103533A (en) | 1996-05-14 |
Family
ID=11064140
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| IL10353392A IL103533A (en) | 1992-10-23 | 1992-10-23 | Cellulose-based package material having an increased adsorption capacity and its manufacture |
Country Status (1)
| Country | Link |
|---|---|
| IL (1) | IL103533A (en) |
-
1992
- 1992-10-23 IL IL10353392A patent/IL103533A/en not_active IP Right Cessation
Also Published As
| Publication number | Publication date |
|---|---|
| IL103533A0 (en) | 1993-03-15 |
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