US3815615A - Degreasing apparatus and method - Google Patents

Degreasing apparatus and method Download PDF

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Publication number
US3815615A
US3815615A US00263206A US26320672A US3815615A US 3815615 A US3815615 A US 3815615A US 00263206 A US00263206 A US 00263206A US 26320672 A US26320672 A US 26320672A US 3815615 A US3815615 A US 3815615A
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United States
Prior art keywords
solvent
container
articles
vapour
wheel
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Expired - Lifetime
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US00263206A
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English (en)
Inventor
K Holm
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Uddeholms AB
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Uddeholms AB
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    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23G—CLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
    • C23G5/00—Cleaning or de-greasing metallic material by other methods; Apparatus for cleaning or de-greasing metallic material with organic solvents
    • C23G5/02—Cleaning or de-greasing metallic material by other methods; Apparatus for cleaning or de-greasing metallic material with organic solvents using organic solvents
    • C23G5/04—Apparatus

Definitions

  • the invention relates to an apparatus for degreasing articles with the help of a solvent, preferably a chlorinated hydrocarbon, such as trichloroethylene or perchloroethylene.
  • a solvent preferably a chlorinated hydrocarbon, such as trichloroethylene or perchloroethylene.
  • Degreasing apparatuses are known in which the objects are treated with a liquid solvent, or with the vapour from a boiling solvent, or with both.
  • the invention relates to an apparatus of the known type which comprises a degreasing tank, a first container for liquid solvent, located in the degreasing tank and intended for relatively cool solvent, a second container for liquid solvent, heating means to heat the solvent in the second container to boiling in order to provide a vapour zone of gaseous solvent above the first container, a condensor located in the vapour zone for condensation of solvent vapour, preferably located so that it defines the upper level of the vapour zone, and a transport means to transport the articles down through the vapour zone, through the solvent in the first container and up through the vapour zone.
  • the object of the invention is to achieve an apparatus which permits more efficient degreasing than previously known apparatus of this type.
  • this is achieved by arranging the first container to receive the relatively clean liquid solvent which is formed when the solvent vapour condenses on the condensor and on the articles as they pass up through the vapour zone, and by arranging the second container to receive the relatively unclean solvent which is formed when the solvent vapour condenses on the articles as they pass down through the vapour zone.
  • the explanation of the satisfactory cleaning effect would appear to be that the articles are subjected to a pre-degreasing on their way down towards the first container with liquid solvent and that the unclean condensate which then runs off the articles is not permitted to mix'with the liquid solvent in this first container.
  • the solvent in the first container can, therefore, be kept relatively clean.
  • FIGS. 1 and 2 show one embodiment of the apparatus according to the invention.
  • FIG. 3 shows a second embodiment
  • the apparatus according to FIGS. 1 and 2 comprises a degreasing container 1 having rectangular cross section and provided with a lid 2.
  • a container 3 is located in the bottom of the tank, for liquid solvent. This solvent can be brought to boil with the help of immersion heaters 4.
  • the vapour from the solvent fills a vapour zone 5.
  • this vapour zone 5 is a container 6, open at the top, with a heat insulated bottom 7a and side walls 7b. This container 6 fills the entire cross-section of the degreasing tank 1, except for an opening 8 at one short side of the tank.
  • a wheel is also arranged in the degreasing tank 1, this wheel comprising a circular disc 9, an annular plate 10 and a perforated, cylindrical wall 11.
  • the wheel is mounted on a horizontal shaft 12 and can be rotated in the direction of the arrow by means of a motor 13.
  • the wheel is divided into compartments 26 by means of a plurality of partition walls or shelves 14 extending substantially radially from the cylindrical wall 1 approximately to the inner edge of the annular plate 10.
  • the inner edge part 15 of the shelf 14 is bent at a right angle in the opposite direction to the direction of rotation of the wheel.
  • the outer edge part 16 of the shelf 14 extends through a slot in the perforated wall 11 and forms a drip-edge, the importance of which will be explained later on.
  • the degreasing tank 1 also contains a condensor in the form of cooling tubes 19 placed in a pocket 20 which collects the condensate formed, the condensate then running down to the container 6 through a conduit 21.
  • the upper edge of the pocket 20 will define the upper level 22 of the vapour zone, which should be located at the shaft 12 of the wheel, or slightly lower.
  • Articles 27 to be degreased are supplied to the wheel 9 11 by a conveyor 17 which extends into the wheel through the opening in the annular disc 10.
  • the conveyor is in the form of an inclined sliding track which is so positioned that the articles 27 land on a shelf 14 when the shelf has arrived at approximately position 14a, that is in an approximately horizontal position.
  • Degreased articles are removed from the wheel 9-11 by a conveyor 18 which also extends through the opening in the annular plate 10.
  • This conveyor 18 also comprises an inclined sliding track and is positioned so that the articles 27 slide off a shelf 14 down on to the conveyor 18 when the shelf is approximately in position 14b. In this position the bent edge section 15b of the shelf faces downwardly and does not therefore impede the movement of the articles.
  • the apparatus according to FIGS. 1 and 2 functions in the following manner.
  • the unclean articles are carried by the wheel 9-11 down through the vapour zone 5.
  • the vapour from the solvent condenseson the cold articles and the condensate runs off, carrying with it most of the fat, oil and other impurities.
  • the unclean condensate runs along the shelf 14, through the openings in the perforated wall 11, and drips from the dripedge 16 through the opening 8 down into the boiling solvent in the container 3.
  • the impurities thus increase in this solvent, which must be changed from time to time.
  • the drip-edges 16 thus prevent the unclean condensate from running along the cylindrical wall 11 down into thecontainer 6.
  • the temperature of the solvent in the container 6 should suitably be 20 below the boiling point of the solvent, or lower. This low temperature is maintained partly since the container 6 receives relatively cool condensate from the condensor l9 and partly because the bottom 7a and wall 7b are heat-insulated. The solvent in the container 6 is gradually cleaned since the excess runs over the upper edge of the wall 7b, down into the container 3.
  • the apparatus according to FIG. 3 is similar to the apparatus according to FIGS. 1 and 2 and corresponding parts have the same designations. The difference is that theapparatus according to FIG. 3 is provided with an endless chain conveyor 24 which is carried by wheels 25. At regular distances along the conveyor 24 containers 23 are provided for the articles to be degreased. The predegreasing takes place in position 23a, the unclean condensate then running down into the container 3. In position 23b the articles are in the solvent in the container 6, and in position 230 the final degreasing takes place in the solvent vapour.
  • a first container (6) for liquid solvent located in the degreasing tank (1) and intended for relatively cool solvent;
  • heating means (4) to heat solvent in the second container (3) to boiling in order to provide a vapour zone (5) of gaseous solvent above the first container (6);
  • a transport means consisting essentially of a wheel (9) having a perforated wall (11) and compartments (26) for goods to be cleaned, the wheel being arranged for rotation in one direction and to be partly in such vapour zone (5) and partly in solvent in the first container (6), the wheel (9-11) being so positioned that in part it extends directly over the second container (3) without intervention of the first container and is provided with dripedges (16) from which solvent condensing on the unclean articles drips down into the second container (3), said wheel (91 1 transporting articles down through vapour zone (5), through solvent in the first container 6) and up through such vapour zone (5),
  • said first container (6) being arranged to receive relatively clean liquid solvent formed when solvent vapour condenses on said condenser (19) and on the articles as they pass up through such vapour zone (5) and v said second container (3) being arranged to receive from said drip edges relatively unclean solvent formed when solvent vapour condenses on the articles as they pass down through such vapour zone (5).
  • degreasing apparatus defined in claim 1 according to which a plurality of spaced shelves (14) form partition walls separating said compartments (26) from each other, said apparatus further including a f irst means for conveying articles to be degreased into said wheel and onto said shelves, and a second means for receiving degreased articles from said shelves and transporting same from the wheel.
  • a plurality of spaced shelves (14) form partition walls separating said compartments (26)v from each other, said shelves (14) extending substantially radially and having edge walls (15 extending substantially at right angles to said shelves in a direction oppov site to the direction of rotation of said wheel.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Cleaning By Liquid Or Steam (AREA)
US00263206A 1971-07-22 1972-06-15 Degreasing apparatus and method Expired - Lifetime US3815615A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE09447/71A SE350285B (enrdf_load_stackoverflow) 1971-07-22 1971-07-22

Publications (1)

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US3815615A true US3815615A (en) 1974-06-11

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US00263206A Expired - Lifetime US3815615A (en) 1971-07-22 1972-06-15 Degreasing apparatus and method

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US (1) US3815615A (enrdf_load_stackoverflow)
DE (1) DE2234999A1 (enrdf_load_stackoverflow)
SE (1) SE350285B (enrdf_load_stackoverflow)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4601080A (en) * 1985-04-29 1986-07-22 Cook Terrence E Washing apparatus
US4682613A (en) * 1986-07-23 1987-07-28 Water Equipment Services, Inc. Loose fill media cleaning apparatus
US4804420A (en) * 1985-02-11 1989-02-14 Entek Manufacturing, Inc. Method for degreasing a continuous sheet of thin material
GB2209768A (en) * 1987-09-16 1989-05-24 Croftshaw Equipment Limited Vapour/liquid solvent degreasing plant

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2571581A (en) * 1948-09-09 1951-10-16 Detrex Corp Degreasing machine
US3606896A (en) * 1968-07-17 1971-09-21 Uddeholms Ab Apparatus for degreasing objects with vapor from a boiling solvent
US3656492A (en) * 1970-03-20 1972-04-18 Uddeholms Ab Apparatus for steam degreasing

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2571581A (en) * 1948-09-09 1951-10-16 Detrex Corp Degreasing machine
US3606896A (en) * 1968-07-17 1971-09-21 Uddeholms Ab Apparatus for degreasing objects with vapor from a boiling solvent
US3656492A (en) * 1970-03-20 1972-04-18 Uddeholms Ab Apparatus for steam degreasing

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4804420A (en) * 1985-02-11 1989-02-14 Entek Manufacturing, Inc. Method for degreasing a continuous sheet of thin material
US4601080A (en) * 1985-04-29 1986-07-22 Cook Terrence E Washing apparatus
US4682613A (en) * 1986-07-23 1987-07-28 Water Equipment Services, Inc. Loose fill media cleaning apparatus
GB2209768A (en) * 1987-09-16 1989-05-24 Croftshaw Equipment Limited Vapour/liquid solvent degreasing plant

Also Published As

Publication number Publication date
DE2234999A1 (de) 1973-02-01
SE350285B (enrdf_load_stackoverflow) 1972-10-23

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