DE2240726A1 - PROCESS AND MIXTURE FOR THE PRODUCTION OF FIBER PULP FROM REGENERATED WASTE PAPER - Google Patents

Description

Description of the process and mixture for the manufacture of Pulp from regenerated waste paper The invention relates to a method and a Mixture for the production of pulp from regenerated waste paper and relates in particular on the recovery of pulp, which can be processed again after cleaning is and is made from waste paper, which can consist of clay-coated paper, printed paper or cardboard, made from envelopes, magazine and business papers as well as from document paper and business journal paper types, such as those used for accounting purposes used and printed with different types of colored inks, can be embossed or lined, from magazine covers, letterpress paper, Stapling and the like.

It is difficult to use certain resinous or hot melt processes Applied adhesives or adhesives, paper colors such as gold bars (golden rods), red-and-yellow colors (canaries) for documents and books of paper for accounting purposes «as well as various types of printing inks, as used in printing companies, Used in book and magazine printing and the like. To be removed.

Some types of paper contain large amounts of valuable fiber with the same proportion of rag or cotton.

Additional difficulties arise when removing rotogravure, Offset and high-gloss inks together with printing inks with countless different resin contents and shades. Much of this waste paper is generated by the thousands Tons burned every day, regardless of the inevitable paper shortage that ensued facing the industry.

It is highly desirable to increase the fiber content of such Recover waste paper and in the production or in the improvement of quality; paper and to be able to reuse cardboard for cardboard boxes and packaging materials.

The invention is based on the object, with simple means economically feasible and effective process and a treatment mixture to create with which glue or binders or various resins and others Dyes, such as those used in printing, filler resins and coating resins and the like. Can be removed to a pure white or colorless Obtain pulp, which is considered a high quality pulp in the production and improvement of newsprint, printing paper, cardboard, envelopes, bags, bags or the like. as other paper or cellulosic products can be processed.

The invention is hereinafter described in more detail With regard to the recovery or regeneration of waste paper and described explains that from clay-coated covers and magazines as well as from types of business paper etc. consists of a large number of different colored differently Printing inks were printed, as well as from the envelopes or the page blocks of Pages taken from magazines with different black and colored imprints. Such printing inks are characterized by a high resin content and by printing ink or soot, dyes, etc. manufactured pigments from.

It should be noted that the procedure described below to regenerate such printed magazine papers even easier on the Regeneration of others, printed or colored with different types of inks, or unprinted or uncolored types of paper or cardboard can be used.

EXAMPLE 1 A predeterminable amount by weight of printed magazines, etc., as a whole without removing any pages or any of their inserts or inserts to be regenerated, the waste paper is preferably in the dry state crushed.

If large plants are available for regeneration, then the magazines are handled intact.

The shredded paper is used to determine the volume to be treated weighed and then introduced into tanks in which it is mixed with water, preferably in proportion of about 7.57 l of water for each about 454 g of paper, and with the addition of the following Chemicals to be described in more detail for the water being boiled during bath motion. The cooking time is at least 10 minutes per batch.

The chemicals used for the aqueous cooking solution each set about 454 g together as follows: 100 g sodium hydroxide (caustic soda), dry weight, 250 g sodium carbonate (soda ash), 48 g sodium or ammonium bicarbonate and 56 g sodium borate (borax).

About 454 g of this chemical mixture make about 4540 each up to about 9080 g paper. This corresponds to about 45.4 kp to about 90.8 kp of chemicals on each about 907 kp paper, the chemicals in the described ratio of about 7.57 liters of water per 454 g of paper are dissolved in water. It is believed, that the chemicals react by synergistic reaction in solution as a reaction compound Form sodium borocarbonate.

It is convenient to boil for at least 10 minutes to cook and the bath during this period of time until shortly before the transition of the food to move vigorously into a pasty pulp. Lower temperatures all the way down to about 82.5 ° C can be used, but this leads to a significant Extending the reaction time in the chemical solution, making it out of practical Considerations out expedient, the treatment temperature in the range between about 93.5 0C and the boiling temperature of about 100 0C of the solution to choose.

This results in a pulp to which water must be added, so that the mixture can be pumped or withdrawn from the kettle. Of the Pulp is drawn off and washed out with cold water.

In the method according to the invention, tanks made of steel can or attachments are used. In the case of batch operation, it is advisable to use the batches with about 910 kp to about 1816 kp to choose.

The boiled paper is made with cold water in a conventional Hydropulper, Dutch or a Jordan or

Conical pulp mill or a chopper dissolved until the pulp state is reached, then washed again with cold water and sieved.

The washed-out pulp is drawn off and then placed in hot water of between about 43.5 ° C. and about 60 ° C., which is a chlorinating bleach conventional type, e.g.

Sodium hypochlorite, with 5.25 parts active and 94.75 parts inert Components, in a ratio of up to about 360 1 per tonne of weight of starting paper is added. After a bleaching time of between 5 and 20 minutes, preferably from 10 to 15 minutes, the pulp is used to remove the chlorinating bleach solution washed out again with cold water. Then the pulp can be placed in moist fleece or briquettes are formed which are to be processed in plants or

Machines for the production of paper or cardboard are suitable.

The dispatch of the moist fleece gu makes nearby paper mills no drying process, nor excessive water replenishment required, so that not only time is saved, but also overheating or destruction or shortening of the fibers in the pulp is avoided. The briquettes or compacts can be shredded again in a short time to form pulp.

In the recovery of the fiber fractions as the waste paper raw material there are different results depending on the type and sorting of the waste paper used Degrees of exploitation.

The recovered or regenerated pulp does not have any of the im Printing inks, clay fillers, adhesives, fillers contained in waste paper raw materials and glues and is completely antiseptic and free of slimicides (slimicides) and sponge poisons. The chemical cooking treatment also removes germs and bacteria killed, so that the end product is relatively pure and can be used safely will can. The pulp pulps can be used alone or in combination with other pulps or with pulps containing rag or cotton Production of white fine paper or of document or accounting papers be used.

Kraft paper can be made from bags, pouches, envelopes, printing papers, Cardboard, cardboard boxes or the like can be recovered at high levels of exploitation. Depending on The type of regenerated paper is pulp in predeterminable mixing ratios and proportions that can be used to comply with uniform regulations or guidelines can be standardized. Reclaimed document papers and accounting papers are extremely sought-after, result in high levels of exploitation of 80, some even 90%, and are easier to sell if the profit is higher0 The same applies to bleached kraft paper.

EXAMPLE 2 Instead of other high quality papers you can use any Share of invalidated and used bank checks and stock certificates that are common are printed on yellow, green or blue security paper, used and accordingly Example 1 will be treated. The regenerated pulp is pure white in one More than 80% yield.

EXAMPLE 3 Waste paper with a rag or cotton content between 25 and 50% business paper with embossed letterheads was made according to the example 1 treated. Cakes of regenerated pulp formed during the filtering of the pulp confirmed a maximum degree of exploitation for rag and cellulose fiber, without detectable Damage in ar fiber. Old paper from white business paper brings bonuses and is therefore payable to a limited extent. However, if you use all of them colored or dyed or all mixed papers, the result is a strong one Increase in the tonnages available for regeneration according to Example 1.

When treated according to Example 1, these result Papers no trouble.

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ii r 'EXAMPLE 4 Large, strong envelopes made of Kraft paper with an Different colored stickers stuck on the surface and with stickers left on canceled postage stamps were treated in different-cooking amounts. Of that some remained unbleached as natural kraft paper, others became different heavily bleached to completely white. The paper was, as indicated in Example 1, treated, however the initial vigorous boil was reduced to between 10 and Limited to 15 minutes.

The bleaching time was also a little longer.

A Kraft pulp with a slight yellow tinge was obtained in one case Yield of more than 80% of the initial pulp content in the envelopes. The same yield was obtained with a slightly longer bleaching time, but the pulp was very white.

The method described in Examples 1 to 4 is more diverse Way modifiable.

The amount of sodium hydroxide in the chemical bath in which the crushed Paper is cooked, in example 1, can be completely or partially by others Alkali metal hydroxides, e.g.

Potassium hydroxide. The sodium carbonate can be completely or partly by equal amounts of other alkali metal or ammonium carbonates, and the sodium or ammonium bicarbonate in whole or in part by others Alkali metal bicarbonates are replaced.

Although the relationship described in Example 1 between the chemical If components of the solution are preferred, these chemicals may vary up to + 200> can be used. This can reduce the amount of chemicals in the solid state each about 454 g of paper are varied so that one part by weight of chemicals in the solid state comes on between 10 and 30 parts by weight of paper with the best results can be achieved using the ratio described in Example 1, at one part by weight of chemicals in the solid state to between 10 and 20 parts by weight Paper is coming.

The composition of the solution can be chosen so that the described and dissolved amounts of chemicals in the ratio of about 75.7 1 Solution to about 227 g to about 908 g of chemicals, preferably from about 75.7 liters of solution to about 363 g to about 544 g of chemicals.

The paper can be in chemical solution at above atmospheric pressure lying pressures and be cooked at correspondingly higher temperatures. Such However, high temperatures are not appropriate because there is a risk that the fibers are destroyed. It is preferred to keep the paper at atmospheric pressure at a temperature lying around the boiling point of the solution for about 10 to Cook for 15 minutes. This time is longer at a lower temperature. It is not wake-up, the cooking temperature below about 82.5 ° C, preferably not below about 93.5 ° C.

Correspondingly, the chlorinating bleaching can take place at temperatures up to to about 60 ° C. down to about 43.5 ° C., as in example 1, can be carried out. However, it is not practical that Bleaching temperature far below to choose about 38 0C, otherwise to achieve the desired degree of bleaching a Excessively long time or additional work steps are taken up must, whereby there is not only the risk that the fibers in the pulp will be destroyed but also higher costs.

From the foregoing it will be seen that the invention is an improved one and effective method for recovering or regenerating waste paper creates, with which a high quality fiber is produced in the pulp, which in conventional Way can be used for the production of paper and paper products.

Claims (25)

EXPECTATIONS 1. Process for producing pulp from regenerated waste paper; by the fact that the waste paper is shredded and in a chemical solution is boiled, which is essentially composed of a Alkali metal hydroxide, an alkali metal or ammonium carbonate, an alkali metal or ammonium bicarbonate and an alkali metal borate in the ratio of 100 to 200 Parts by weight of alkali metal hydroxide, 150 to 250 parts by weight of alkali metal carbonate, 48 + 20 parts by weight of the bicarbonate and 56 + 20%; Parts by weight of the borate with which Provided that the chemicals in the solid state in the solution with about one part by weight dissolved solid chemicals are contained in 10 to 30 parts by weight of paper that Furthermore, the chemically treated paper is separated from the solution, the paper is washed out with water, the washed-out paper is dissolved and the washed-out Pulp with a chemical bleach at a temperature between about 38 OC and 60 ° C. and then the bleached fiber pulp is washed out with water will. 2. The method according to claim 1, characterized in that g e k e n n z e i c h -n e t, that the treatment of the waste paper in the chemical solution with vigorous agitation is carried out. 3. The method according to claim 1 or 2, characterized in that g e k e n n z e i c h n e t that the dissolved solid chemicals in the solution with one part by weight of solid chemicals on 10 to 20 wt. paper are included. 4. The method according to any one of claims 1 to 3, characterized g e k e n n Note that the separated chemically treated paper with cold water is washed out. 5. The method according to any one of claims 1 to 4, characterized g e k e n n notifies that the bleached pulp is washed out with cold water. 6. The method according to any one of claims 1 to 5, characterized g e k e n n note that the paper index boiling solution for at least 10 minutes is cooked at a temperature between about 82.5 ° C and 100 ° C. 7. The method according to any one of claims 1 to 6, characterized g e k e n-n Note that the paper is in the boiling solution for at least 10 minutes at a temperature of more than about 93.5 ° C. to the boiling point of the solution is cooked. 8. The method according to any one of claims 1 to 7, characterized g e k e n n notes that atrium hydroxide as the alkali metal hydroxide and atrium hydroxide as the bicarbonate Sodium bicarbonate is used. 9. The method according to any one of claims 1 to 8, characterized g e k e n n notes that as the alkali metal carbonate, sodium carbonate and as the alkali metal borate Sodium borate is used. 10. The method according to any one of claims 1 to 9, characterized g e k e n It should be noted that in the boiling solution about 9080 g of paper 100 + 20 g Sodium hydroxide, 150 + 20 g sodium carbonate, 48 + 20 g sodium bicarbonate and 56 + 10 </ o g sodium borate are contained. 11. The method according to any one of claims 1 to 10, characterized g e k e n It should be noted that when the paper is boiled in the boiling solution, each about 3.79 1 boiling solution contains about 113.5 g to about 908 g paper. 12. The method according to any one of claims 1 to 11, characterized g e k e n It should be noted that when the paper is boiled in the boiling solution, j is about 3.79 1 boiling solution contains about 227 g to about 454 g paper. 13. The method according to any one of claims 1 to 12, characterized g e k e n Note that the boiled and washed paper with cold water in a hydropulper or chopper. 14. The method according to any one of claims 1 to 13, characterized g e k e n Note that if the pulp is vigorously agitated with a chemical bleach is bleached at a temperature between about 38 ° C and 60 ° C. 15. The method according to any one of claims 1 to 14, characterized g e k e n It should be noted that the bleaching time chosen is between 5 and 15 minutes. 16. The method according to any one of claims 1 to 15, characterized g e k e n I do not state that chlorinating bleaching is carried out. 17. The method according to any one of claims 1 to 16, characterized in that g e k e n It is noted that the chemicals act as a synergistic reaction to sodium borocarbonate form. 18. The method according to any one of claims 1 to 17, characterized g e k e n It is noted that the ratio of materials used is about 227 g to about 908 g of chemicals for each about 75.7 1 solution and about 454 g of chemicals each about 4.54 kg to about 13.6 kg of paper. 19. The method according to any one of claims 1 to 18, characterized g e k e n It is noted that the ratio of the materials used is about 363 g to about 544 g of chemicals for each about 75.7 1 aqueous solution and about 4.54 kp to about 9.08 kg of paper. 20. Mixture for producing pulp from regenerated waste paper in connection with the method according to any one of claims 1 to 19, characterized in that g e k It is noted that the solid ingredients used to prepare the mixture are essentially composed of a) an alkali metal hydroxide, b) an alkali metal carbonate, c) an alkali metal or ammonium bicarbonate and d) an alkali metal borate in a ratio of 100 to 200 + 20 °, 4 parts by weight of alkali metal hydroxide, 150 to 250 + 20% parts by weight of alkali metal carbonate, 48 + 20% parts by weight of the bicarbonate and 56 + 20% parts by weight of the borate. 21. Mixture according to claim 20, characterized in that g e k e n n -z e i c h n e t, that the proportion by weight of the chemicals is: 100 parts by weight of hydroxide, 250 parts by weight of carbonate, 48 parts by weight of bicarbonate and 56 parts by weight of borate. 22. Mixture according to claim 20 and 21, characterized in that g e k e n n -z e i c Note that as the alkali metal hydroxide, sodium hydroxide and as the bicarbonate Sodium bicarbonate is used. 23. Mixture according to claim 20, characterized in that g e k e n n -z e i c h n e t, that as the alkali metal carbonate, sodium carbonate and as the alkali metal borate, sodium borate is used. 24. Mixture according to claim 20, characterized in that g e k e n n -z e i c h n e t, that the chemicals are in an aqueous medium at a concentration of about 227 g to about 908 g of chemicals per about 75.7 l of solution are converted into solution. 25. Mixture according to claim 20, characterized in that g e k e n n -z e i c h n e t, that the chemicals are in an aqueous medium at a concentration of about 363 g to about 544 g of chemicals per 75.7 l of solution are converted into solution.