DE102007016421A1 - Sedimentation filter for contaminated liquids useful for cleaning up moistening agents for offset printing has number of downwards sloping take off channels with exit holes and gives increased efficiency in liquid cleaning - Google Patents

Abstract

Sedimentation filter for contaminated liquids, especially for filtering a moistening agent for offset printing has a filter housing (10) with inlet (12) and outlet (14) and a number of downwards sloping take off channels with exit holes at the lower end. The lower end of the take off channel has ascending tubes for the separated liquid.

Description

The Invention relates to a sedimentation filter for contaminated liquids, especially for Dampening solution for the offset printing.

At the Offset printing is a so-called fountain solution used with the the pressure roller at those points which should remain free of printing ink, is moistened. This dampening solution is usually after the Use attributed and in a collection container for the Reuse collected. In the fountain solution accumulates a significant Dirt load caused by paint residues, dust and other impurities comes about.

In spite of This pollution makes sense, the dampening solution in the circulation process to reuse, as it contains alcohol and other additives in addition to water, so that the manufacturing causes some costs. Otherwise, the disposal is due to the mentioned additions not without problems and therefore associated with further costs.

In order to The moisturizer can be reused, therefore, it is usually cleaned before reuse. For this purpose are different Filter systems known, however, in turn cleaned at regular intervals Need to become and thus require some maintenance.

Besides are there cleaning devices that work on sedimentation basis, where you have to wait until the dirt load settles in a collecting container on the ground. This procedure require a relatively large Dampening agent quantity, as it determines the circulation speed of the dampening solution naturally decrease. Also, the use of centrifuges for the separation of dampening and dirt is common but requires some equipment.

Examples of the cleaning of dampening solution are in the DE 10 2004 021 507 A1 or the DE 20 2006 014 582 U1 been described.

Of the Invention is based on the object, a cleaning device for polluted liquids and in particular for Dampening solution of offset printing machines to provide at least an effective pre-cleaning of the liquid allows the this already removes a considerable part of its pollution load.

to solution this task is the sedimentation filter according to the invention thereby characterized in that it comprises a filter housing having an inlet and a Outlet as well a number of oblique down extending settling channels comprises the lower end outlet openings for mud have as well as from the lower end ascending drainage channels for de-hydrated liquid, which lead to the outlet.

There themselves through the inlet in the filter housing entering liquid to a larger number from downwards extending settling channels distributed, the liquid moves in these settling channels at low speed. The dirt load therefore has opportunity for settling at the bottom of the channels, which runs obliquely downwards, so that the mud slowly down to the outlet openings located at the lower end of the settling channels moved and finally over one Mud collector removed can be. That way, at least part of it Dirt load freed liquid is deflected and fed to a riser, which is the liquid transported into an upper collecting space, from which the outlet of the sedimentation filter emanates.

Naturally, that can Dampening solution after passing through the mentioned sedimentation filter using a "fine filter" further away from dirt particles be freed.

in the The following are preferred embodiments the invention with reference to the accompanying drawings explained in more detail.

The single figure is a schematic sectional view of a sedimentation filter according to the invention.

In the single figure is a filter housing with 10 designated. This filter housing has an inlet 12 and an outlet 14 for the liquid to be cleaned or purified. From the inlet 12 from the incoming liquid is distributed over a larger number of obliquely downward Absetzkanälen 16 . 18 . 20 . 22 , Since a larger number of settling channels is available, the incoming liquid is distributed, so that sets in the individual settling channels, a relatively very slow downward flow. This slow flow allows the particles of dirt contained in the liquid to settle on the sloping bottom of the settling channels 16 . 18 . 20 . 22 discontinued. Thus, gradually a sludge layer is formed on this floor, which slips down due to gravity and at the lower end of the settling channels through outlet openings 24 . 26 . 28 . 30 falls down.

At the bottom of the channels 16 . 18 . 20 . 22 there are valve flaps 32 . 34 . 36 . 38 that allow the settling channels 16 . 18 . 20 . 22 to close.

When the valve flaps 32 . 34 . 36 . 38 open, the mud slips on the bottom of the settling channels 16 . 18 . 20 . 22 has collected, down into a mud tank 40 , From the mud collection container 40 the mud can pass through an outlet 42 be disposed of. The outlet 42 can be closed with a valve flap, which is not shown in the drawing.

The liberated from the sludge liquid is deflected at the lower end of the settling channels. The liquid enters riser pipes 44 . 46 . 48 . 50 one. Through the riser pipes 44 . 46 . 48 . 50 the water is pushed upwards by the water flowing into the settling channels, so that it is at the upper end of the riser pipes into a liquid collecting chamber 52 entry. The fluid collection chamber 52 is directly with the outlet 14 connected, so that the partially purified or sludge-free liquid can be reused as fountain solution. Naturally, another purification stage, for example for fine filtration, can be connected to its purification by the described sedimentation filter, which is not shown in the drawing.

In the drawing, located below the fluid collection chamber 52 a dashed line 54 , This dashed line 54 can embody a closed partition. On the other hand, it is also possible, the emerging from the riser dampening again in the settling channels 16 . 18 . 20 . 22 initiate and repeat in this way the sedimentation process.

Instead of the separate valve flaps for each Absetzkanäle can naturally also a central closure, such as in the position 42 be provided in the drawing, which ends the dampening solution flow in all settling channels. Such a central valve is not shown in the drawing. Of course, other valve forms may be provided as flap valves.

Claims (4)

Sedimentation filter for contaminated liquids, in particular for dampening solution for offset printing, characterized by a filter housing ( 10 ) with an inlet ( 12 ) and an outlet ( 14 ) and a number of obliquely downward settling channels ( 16 . 18 . 20 . 22 ), which at the lower end outlet openings ( 24 . 26 . 28 . 30 ) having rising from the lower end of the settling risers ( 44 . 46 . 48 . 50 ) for de-entrained liquid discharged to the outlet ( 14 ) to lead. Sedimentation filter according to claim 1, characterized in that at the lower end of the settling valve valves ( 32 . 34 . 36 . 38 ) are provided. Sedimentation filter according to claim 2, characterized in that below the settling channels ( 16 . 18 . 20 . 22 ) a sludge tank ( 40 ), through which the sludge can be collected and discharged. Sedimentation filter according to claim 1, characterized in that the settling channels ( 16 . 18 . 20 . 22 ) into a sludge storage tank ( 40 ), which has a closable by a valve outlet.