DE1761233B1 - Process for the recovery of fibers from plastic-coated waste paper and device for carrying out the process - Google Patents

Description

3 4

The fiber loss caused by the pieces of film is in this case 10 and from this to a mixing container 12

negligibly small. out, there with water to about 0.5% consistency

In the case of a device for carrying out the diluted and then with a flat sieve, preferably

inventive method with a pulper as a vibration sorter 15 sorted, its

and a vibrating sieve connected downstream of this has 5 sieve round holes with a diameter of 2 mm,

According to the invention, the accept outlet of the The sorted waste contains about 30 kg in size and

Sieves with flotation cells in connection. medium-sized pieces of plastic film and about 3 kg

In an advantageous development of these pre-fibers, while the accepts except about 165 kg of fibers

According to the invention, the direction is still about 2 kg of impurities in the form of small

cifically heavier contaminants, such as B. Me- io ner contains pieces of plastic film, the largest of which

tallfolien, a cone centrifuge between sieve length is about 1 to 2 mm. The latter will be

and flotation cells switched on. through the subsequent cleaning in the FIo-

The invention is completely removed in the following on the basis of a station system 20, for which purpose it is

Drawing and two examples explained. The noticeable is to reduce the fabric to a consistency of about

tion shows schematically a device for diluting 0.4%, if necessary with addition

practice the method according to the invention. of chemicals for water softening and others

The flotation aids in the drawing with solid lines. Through the flotation will be

The device shown has a pulper 1 apart from the plastic about 15 kg of fibers

with a trough 2 and an opening propeller 3, so that at the end about 150 kg of pure fibers are added.

ner with a water supply line 4, a conveyor belt 5 ao are recovered. It is of course possible

for the entry of the waste paper to be broken down as well as borrowed the fiber-

with an emptying line 6 for the dissolved substance. material for making inferior paper and

It is advantageous to use the pulper 1 with a sorting cardboard box.

For wet-strength waste paper, it is advisable to retain the water used with coarse impurities and possibly large areas for dissolving to about 40 ° C pieces of film. It has to warm up. In addition, it is preferable in this case to use such a sorting sieve with 20 to 40 mm, to use a pulper with a rotor hole diameter. (If the pulper 1 wing with fixed tear ribs is to be operated continuously together, work will be carried out next to it. Such pulper is expediently also used in the trough 2 in a known manner in the drawing 30 when waste paper is arranged with very thick overflow boxes (not shown).) strong plastic foils are processed. The emptying line 6 opens into an emptying chute 10 which is provided with a circulation system, but in this case also the disengaged propeller 9; this is via substance - without completely dividing the line 11 connected to a mixing box 12, plastic foils and possibly without a sorting sieve 7 in which the dilution water supply line 13 is built into the pulper trough 2 - and from which the line opens 14 leads to one from the pulper directly via a so-called Dick vibratory sorter 15. The material vibration sorter (for example according to the German Paschloses Gutstoff line 16 leads to an intermediate specification 1 187 464), the sieve of which has a round extinguisher container 17, which through a further line 18 is approximately 5 mm and with which is connected to the large one with the flotation plant 20. These pieces of plastic film removed from the suspension stand in a known manner from mixing cell 21 with processing.

dilution water supply line 22, several primary cell B e i s ρ i e 1II

len 23 and two secondary cells 24. Of the primary ^v

cells 23 leads the finished material line 25 to the paper 300 kg waste paper with shares of 228 kg fibers,

machine (not shown); the secondary cells 24 45 45 kg aluminum foils and 27 kg plastic foils

are via a pollutant line 26 with a plane, which are printed in color, are in one

if not shown dirt thickener pulper 1 without sorting sieve 7 together with 9 kg

connected. Soft soap as a flotation ^{aid in 3.7 m 3 water}

The one shown with dash-dotted lines, previously resolved at 40 ° C. Dissolve after 40 minutes two-stage cone centrifugal system 30 is 50 times the suspension is then over a thick matter between the intermediate container 17 and the animal (as described above) in a discharge chute 10 Flotation system 20 switched when specifically emptied. In the process, foreign bodies weighing around 40 kg, e.g. pieces of metal, and pieces of plastic film as well as 4 kg of fibers are removed from the aluminum Fabric to be removed. divorced. After about 1 hour of swelling, the

55 fabric by diluting it to 0.5% consistency

For example a vibrating sorter 15 with 1.6mm perforation

sorted, with 25 kg of medium-sized aluminum and

In a pulper 1 with a volume of 4 m ^3, pieces of plastic film and 2 kg of fibers are removed.

200 kg of plastic-coated waste paper weighing 168 kg can be separated.

Fiber content (absolutely dry) and 32 kg of plastic 60 The fabric now contains around 222 kg of fibers

partly together with 6 kg soft soap as flotation still about 7 kg impurities; partly these are

auxiliary dissolved in 3.8 m ^{s of} water at 15 ° C. small pieces of aluminum, partly small plastic

After 30 minutes of dissolving time, the fiber content of the piece of film is. In addition, the fabric is discolored,

Waste paper broken down into individual fibers; the plastic because some of the printing ink is inevitable from

Foils are cut into pieces, the greatest length of which detaches the foil and takes the form of the finest colored

is about 20 to 40 mm. The pump particles are now in the suspension. To remove

capable fabric with a consistency of about 5%, the aluminum pieces are now guided through the fabric

for stacking and possibly for swelling an emptying through vortex classifier, preferably through a two-

stepped cone centrifugal system 30. Then, as in Example I, the flourishing takes place, but in this one Fall not only the small pieces of plastic film, but also in a known manner Color particles are deposited.

The fabric is now practically free from impurities and has a degree of whiteness that corresponds to that of the originally used pulp corresponds. Only difficult-to-sort types of waste paper are obtained after the treatment described still has a very small proportion of the smallest pieces of aluminum, which - in the case of correspondingly high demands on the paper to be produced - by an additional cone spinner or a sieve device can be removed.

If the waste paper to be processed contains printing ink, which adheres directly to the fiber material, is additionally used in a manner known per se for the purpose of separating the printing ink from the fibers while dissolving sodium peroxide and water glass added. The separation of the printing inks from the Fibers can also be removed by an additional mechanical

o nical processing, for example in a deflaking machine get supported. Fibers that may still be adhering to the foils will also be produced replaced.

1 sheet of drawings

Claims (3)

1 2, however, has the disadvantage that due to the high temperature claims: temperature, the fiber material can lose strength. 1. Method of recovering fibers It is an object of the present invention made of plastic-coated waste paper, based on old cardboard 5, plastic-coated waste paper on sol- or the like, in which z. B. recycle the waste paper before way that the recovered by mechanical processing in water, the fiber material is free of plastic foils and smaller, the fiber material from the plastics thus also for the production of high-quality paper thereby largely resolved and a certificate can be used from it. The solution to this Suspension is made from which the great io task has been significantly increasing in recent times and medium-sized pieces of film in addition to the importance gained from this, that in particular the still life Adhering fibers are sorted out, since the medium industry is increasingly made of paper or characterized in that the milk cartons, ice cream cups, Marga suspension produced in the cardboard box remaining small foil liner cans or the like are used. pieces with the fibers adhering to them through 15 The paper or cardboard must be suitable for such Flotation are separated. Purposes made from high quality pulp and 2. Device for carrying out the method with plastic and / or metal foils coated rens according to claim 1, with a pulper and be. Now, however, the said packaging has a vibrating sieve connected downstream of it, so only a very short service life, which is characterized in that the accept outlet 20 is half such coated paper in the form of a sieve (15) with flotation cells (20) in used articles and of Trim waste is roughly defined. in small quantities as waste paper. A recovery M 3. Device according to claim 2, characterized in that the high-quality pulp fibers are made from this ™ indicates that specific waste material can be removed using the known processes - heavier contaminants, such as B. Metal - 25 as already explained - only incomplete and foil, a cone centrifugal system (30) between causes relatively high costs. Therefore will Sieve (15) and flotation cells (20) currently switched on in specialist circles the processing of this Altist, materials considered uneconomical; the majority of the resulting material is used as waste 30 case eliminated. Despite its amount, however, the cost would be for that The reprocessing of this waste material can be justified if the pulp is again in its pure form. The invention relates to a method for recovery that could be recovered. To achieve this goal of fibers from plastic-coated old 35, attempts have been made to use the known method of paper, old cardboard or the like. B. to improve the old by the fact that the fibrous material containing the small paper by mechanical processing in the water plastic particles is crushed into wheat, the fiber material is separated from the plastics, largely dissolved as sieve devices or vortex separators, and cleaning devices formed therefrom are post-treated , from which the large and medium-sized 40. However, it was found that even with Anwen pieces of film, in addition to the fibers still adhering to them, the finest sieves of plastic particles are sorted out and a device for size remains in the fabric, which in fine writing-implementation of the procedure. and printing papers are perceived as annoying. λ Such processes are known from the book by Also with vortex separators, the plastic \ Heinz Mack "waste paper preparation", 2nd edition, 45 particles could not be removed properly because their 1967. In one of the processes described there, the specific gravity differs too little from that This is what distinguishes the plastic film from the paper fibers in the case of cellulose fibers.
Room temperature due to the pulsating fabric movement. However, with the present invention it is a pulper separately. About one lunge in the ground to solve the task at hand, and that there Pulper located sorting sieve with hole 50 through that with the process diameter described at the beginning from about 3 mm the fiber suspensions become the small ones still remaining in the suspension sion, along with small pieces of film, peeled off pieces of film with the fibers adhering to them gen and passed through another screening device, flotation are separated. It is true that the application is ongoing the return of the flotation from the pulper's sorting sieve to remove printing inks pieces of film held through a separate opening 55 made of waste paper are already known; but it was far away for her will. The decisive factor in this process was the knowledge that the for the nene fibrous material is indeed plastics used for the production of cardboard for the purposes described above, Insert, cardboard, wrapping paper and the like diminish- which are very small in shape according to the known ones quality products. Since, however, in this process, pieces of film that cannot be sorted out in Process a certain proportion of the plastic films 60 are located in the fiber suspension by flotation in the form of small pieces of film unavoidably simple and also completely from the bar remains in the pulp, the use of the suspension can be removed. You get Obtained fiber material for high-quality paper - thus from plastic-coated in this way and cardboard types such as B. Fine papers, not possible. The others in the 65th purity have the same disadvantage. This substance corresponds in its qualified The procedure described in the book. One did that originally for the making of the art of this recommends heating the fresh hydrogen-coated paper used in the pulper up to 90 ° C. This measure pulp. The one caused by the adherence of fibers