DE19907983C2 - Method and device for sorting a paper mixture - Google Patents

Description

The invention relates to a method according to the preamble of claim 1. Die The invention further relates to a device according to the preamble of Claim 2.

Around 12 million t / a of waste paper are currently being reused in Germany. Of this amount will in turn be around 5.3 million t / a in numerous facilities sorted into different types before recycling.

In the known devices and methods for sorting the Collected paper mixtures is used by sorting staff to sort the content of depot containers, bulk bulk goods and / or bundle bulk goods in separate different qualities and each for reuse required paper / cardboard qualities, u. a. deinking quality too to reach. Existing facilities for sorting a paper mixture include conveyor belts and reading belts with sorting staff, which for Production of deinking quality from the sturgeon paper mixture supplied materials such as cardboard, cardboard and possibly books and. a. sorted out by hand.

This way a fraction of mixed paper and a fraction of deinking won, the deinking faction largely from newspapers and There is at least 60% newspapers and magazines as required a proportion of contaminants, e.g. B. cardboard, cardboard, of a maximum of 3%, while the fraction mixed paper, cardboard, other papers, cardboard and in contains smaller proportions of plastics and other contaminants.

In departure from the well-known hand sorting are attempts to Automation has been undertaken with which screening machines or also modern optical detection devices in connection with gripping robots  from the newspapers in terms of optical characteristics and grain size was distinguishable, so that optical recognition devices and screenings insufficient qualities or low throughputs.

DE 25 42 571 A1 describes a method and a device for Paper sorting with which a paper mixture is as similar as possible crushed large pieces with a maximum edge length of 10 cm and that shredded paper mixture using a first air classifier at a high Wind speed into a heavy goods fraction and a first light goods fraction is split up. The first light material fraction is then in a second Air classifier in a second heavy goods fraction and in a second Light material fraction split.

With this known method or this known device one with cardboard, cardboard and heavy kraft paper Separate the enriched heavy goods fraction, however a liability of the Quality requirements for a deinking quality of the light goods fraction are not ensure, especially since the proposed wind classification at a high Wind speed to carry away smaller cardboard ones Ingredients as well as magazines and newspapers in the first light goods fraction leads, so that the separated heavy goods fraction almost exclusively Cardboard, cardboard and heavy kraft papers exist. It is one Shredding of the paper mixture to an edge length of less than or proposed 100 mm, which means a maximum grain size of 141 mm (Diagonal) corresponds if you use a square piece. at crushing with an upper grain size limit of 141 mm to approximately 100 mm there is a risk that smaller ones contained in the paper mixture cardboard-containing components can not be crushed and in the light material fraction get and increase the proportion of contaminants above the 3% to be observed, such as B. Cigarette. Such a coarse upper grain size limit can exceed this cause wrinkled or folded magazines and newspapers due to of their low buoyancy in the air sifting land in the heavy goods fraction.

It is an object of the invention to provide a method according to the preamble of Claim 1 or a device according to the preamble of claim 2 specify with which the quality requirement for deinking quality can be reliably fulfilled and a high yield of deinking can be achieved.

This object is achieved according to the invention in the method mentioned at the outset solved with the characterizing features of claim 1. This task is according to the invention in the device mentioned at the beginning with the characterizing features of claim 2 solved.

By using such a method and device, a manual sorting is eliminated and both the maximum amount of contaminants of 3% as well as the minimum newspaper share of 60% are reliably observed.

In their combination, shredding and wind sifting are possible high throughputs.

When shredding the paper mixture to a grain size in the range From about 40 to 90 mm, a particularly high quality of separation can be achieved between mixed paper and deinking at a relatively low Achieve shredding effort.

If the wind sifting is carried out in a cone sifter, one can ensure largely trouble-free operation and good separation performance. If the wind sifting takes place in a zigzag sifter, a particularly high one Selectivity between mixed paper and deinking can be achieved.

The light material fraction that initially arises during wind sifting, the Deinking quality is beneficial in a cyclone in the (promoting) Airflow and split into deinking.  

The light material fraction that initially arises during wind sifting, the Deinking quality is beneficial in a cyclone in the (promoting) Airflow and split into deinking.

Further embodiments of the invention are the following description refer to.

The invention is illustrated below with reference to one in the figure illustrated embodiment of a device for sorting a Waste paper mixture from a barrel collection explained in more detail.

The device shown in the figure for sorting a waste paper mixture comprises a shredder designed as a hammer mill 1 , a wind sifter designed as a cone sifter 2 , which is connected downstream of the hammer mill 1 , and a cyclone 3 downstream of the cone sifter 2 .

For processing or sorting, the waste paper mixture delivered to the hammer mill 1 via a barrel collection is fed in and crushed there to a grain size of approximately 60 mm.

The shredded waste paper mixture is then split into a heavy material fraction and a light material fraction in the cone sifter 2 by means of an air stream. The heavy goods fraction contains the mixed paper fraction, which largely consists of chunky cardboard / cardboard and other shreds of paper and to a small extent of other contaminants. The light material fraction consists of deinking quality and the conveying air flow.

While the mixed paper fraction reaches a bunker (not shown), the light material fraction is fed to the cyclone 3, where it is separated into deinking and airflow.

After the shredder 1 , cone sifter 2 and cyclone 3 had passed through, approximately 40.5% of mixed paper and approximately 59.5% of deinking were obtained in an experiment, based on the waste paper mixture fed in. The deinking fraction consists of well over 95% thin paper and only a small proportion of thin cardboard.

Another attempt, in which the cone sifter against a zigzag When sifter was replaced, approximately 36% of mixed paper and approximately fell 64% of deinking based on the waste paper mixture.

If the wind sifting is modified by means of the aforementioned tests performed a cross flow classifier, can be a compact design Realize wind separation level with little investment.

Claims (2)

1. A method for sorting a paper mixture, in which the paper mixture is crushed and split into a heavy material fraction and a light good fraction by air sifting, characterized in that the paper mixture is crushed to a grain size in the range from approximately 40 to 90 mm and the pulverized paper mixture by means of Air separation in a cone sifter is separated into a heavy material fraction containing mixed paper and a light material fraction containing deinking. 2. Device for sorting a paper mixture with a shredder ( 1 ) for shredding the paper mixture and a wind sifter ( 2 ) connected to the shredder ( 1 ) for separating the shredded Papiergemi cal into a heavy goods fraction and a light goods fraction, characterized in that Shredder ( 1 ) is equipped with shredding means for shredding to a grain size in the range of approximately 40 to 90 mm and the wind sifter ( 2 ) is designed as a cone sifter.