US3886897A - Powder applicator - Google Patents

Powder applicator Download PDF

Info

Publication number
US3886897A
US3886897A US444872A US44487274A US3886897A US 3886897 A US3886897 A US 3886897A US 444872 A US444872 A US 444872A US 44487274 A US44487274 A US 44487274A US 3886897 A US3886897 A US 3886897A
Authority
US
United States
Prior art keywords
dusting
air
chamber
filter
hopper
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US444872A
Other languages
English (en)
Inventor
Derek Keith Unwin
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Chandor Ltd
Original Assignee
Chandor Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Chandor Ltd filed Critical Chandor Ltd
Application granted granted Critical
Publication of US3886897A publication Critical patent/US3886897A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C37/00—Component parts, details, accessories or auxiliary operations, not covered by group B29C33/00 or B29C35/00
    • B29C37/0067—Using separating agents during or after moulding; Applying separating agents on preforms or articles, e.g. to prevent sticking to each other
    • B29C37/0071—Dusting machines

Definitions

  • the invention provides powder processing apparatus including an enclosed processing chamber, powder processing means within said chamber, an air filter associated with said processing chamber for extracting powder from air flowing through the filter, and means operative to extract air from said processing chamber through the air filter so as to tend to establish anegative pressure differential between the interior and the exterior of said chamber, the arrangement being such that, in operation, air entering said chamber from the exterior thereof aids the containment within said chamber of the process powder.
  • the apparatus of the invention is particularly useful for the application of dusting powder. A preferred embodiment of dusting apperatus according to the invention is illustrated and described.
  • This invention relates to powder processing apparatus and more particularly to apparatus for applying dusting powder (particularly, though not exclusively, talc) to articles which acquire a tacky or sticky surface during their manufacture. Rubber articles emerging from an extruder or calender for example, are tacky and must be dusted before they are cured in order to prevent them from bonding together.
  • the public health authorities are not insisting upon cleaner working atmospheres in factory premises, particularly having regard to the dangers of operatives contacting the disease pneumoconiosis, and the present invention is directed to a dusting apparatus which seeks to reduce the amount of dusting powder liberated to the operatives working environment.
  • the present invention resides in the realization that by providing powder processing apparatus adapted, in operation, to provide a negative pressure differential between the air pressure within the processing chamber of the apparatus and the external air pressure, i.e. the pressure of the atmosphere in the operatives working environment, the tendency is for powder to be contained within the apparatus by virtue of air flow from the operatives working environment into the processing chamber.
  • powder processing apparatus including an enclosed processing chamber, powder processing means within said chamber, an air filter associated with said processing'chamber for extracting powder from air flowing through the filter, and means operative to extract air from said processing chamber through the air filter so as to tend to establish a negative pressure differential between the interior and the exterior of said chamber, the arrangement being such that, in operation, air entering said chamber from the exterior thereof aids the containment within said chamber of the process powder.
  • Apparatus according to the present invention is particularly useful for the application of dusting powder and thus according to a preferred embodiment of the present invention there is provided a dusting apparatus including an enclosed dusting chamber, means to envelop an article introduced into the dusting chamber with dusting material, an air filter associated with said dusting chamber for extracting dusting material from air-flowing through the filter, and means operative to. extract air from said dusting chamber through the air filter so as to tend to establish a negative pressure differential between the interior and the exterior of said chamber, the arrangement being such that, in operation, air entering said chamber from the exterior thereof aids the containment within said chamber of the dusting material.
  • the air filter is preferably self-cleansing and preferably also is of the maximum effective area allowable within the restrictions imposed by the dimensions of the apparatus.
  • the filter be contained within the chamber or on a wall thereof and that the stock of dusting material be contained either in the bottom of the dusting chamber, whereto it will fall having been cleansed from the filter, or in a chamber fed with dusting material therefrom.
  • a particularly convenient arrangement employs a cylindrical drum filter, the curved surface area whereof constitutes the filtering area of the filter, arranged for axial rotation past a scraper spaced a predetermined small distance from the curved filtering surface and adapted to maintain upon the filtering surface a layer of dusting material of no more than a predetermined thickness.
  • the filter preferably has a replaceable filter element which may, for example, be formed of an appropriate air-permeable paper.
  • the filter For extracting air from the interior of the dusting chamber, the filter is connected in an air passageway venting to the chamber exterior and a suitable impeller is provided to cause air flow in said passageway.
  • a suitable impeller is provided to cause air flow in said passageway.
  • the article could merely be caused to pass through a hopper of dusting material.
  • the gaseous atmosphere within the dusting chamber could be pervaded with dusting material for example by employing an agitator within a dusting material hopper (which may comprise the bottom of the dusting chamber) to provide a laden atmosphere in the hopper, and an air passageway could be provided having an inlet to accept dust laden air from the hopper and an outlet (or a plurality of outlets) arranged to deliver the dust laden air to the article to be powdered, an impeller being provided in the passageway.
  • the abovementioned agitator may have an adjustable speed control to enable adjustment of the dust content of the air drawn from the hopper.
  • an advantageous arrangement is achieved by providing a valve in the air passageway conveying dust laden air from the hopper and to arrange the valve to be adjustable to adjust the relative proportions, in the dust laden air delivered by the'passageway to its outlet, of dust laden air taken from the hopper environment and relatively clean air taken from another location within the dusting chamber (or from the exterior thereof, though this is not preferred since it increases the task of the means to develop a negative pressure differential between the interior and exterior of the dusting chamber).
  • FIG. 1 shows a schematic side view of a first embodiment of a dusting apparatus according to this invention
  • FIG. 2 shows another schematic side view of the apparatus of FIG. 1, from an orthogonal direction
  • FIG. 3 shows a view similar to that of FIG. 1 of another, but similar, embodiment of this invention
  • FIG. 4 shows a view of the embodiment of FIG. 3 similar to that in FIG. 2 of the embodiment of FIG. 1;
  • FIG. 5 shows a schematic side view of another embodiment of this invention adapted for dusting electrical cables subsequent to the provision on the individual conductors thereof of an electrically insulating covering but prior to the encapsulation with plastics material of the several conductors constituting the cable;
  • FIG. 6 shows a schematic side view of the embodiment of FIG. 5 from an orthogonal direction.
  • FIGS. 1 and 2 there is therein shows a dusting apparatus comprising a resin bonded glass fibre container 1 shaped as shown to define therewithin a dusting chamber 2 and an integral hopper 3.
  • the apparatus shown is adapted for the dusting of continuous extrusions which, in use of the apparatus, will pass through the upper part of the dusting chamber 2.
  • an air filter 4 comprising an axially journalled hollow cylindrical drumhaving a perforated curved surface supporting a replaceable paper element.
  • a scraper blade 5 mounted adjacent the curved surface of filter drum 4 is a scraper blade 5 adapted to provide a cleansing function for the filter by ensuring that the build-up of dusting material on the filter surface does not exceed a predetermined thickness.
  • Rotatably mounted in the hopper part 3 of the container 1 is an agitator in the form of a rotary paddle 6.
  • the filter drum 4 and the rotary paddle 6 are both driven by an electric motor 7 through appropriate chain-and-sprocket drives.
  • Adjacent to the hopper part 3 of the container 1 is the inlet end of an air passageway 8 leading to a centrifugla impeller 9 and thence to dusting nozzles (not shown) arranged in dusting chamber 2.
  • a second air passageway 10 is also provided having an inlet at an adjustable height snorkel 1 1.
  • a simple flap valve 12 operated by remote control lever 14 determined the relative resistances to air flow therethrough and into air passageway 8 and impeller 9 of the air flow path proviided through snorkel 11 and passageway 10 and the alternative flow path provided directly from the hopper region through the valve 12.
  • valve 12 provides a simple and convenient means of adjusting the dusting density by adjustment of the relative proportions of dust laden air intake and relatively clean air intake.
  • a second electric motor 14 is provided for driving impeller 9 and serves also to drive an impeller 15 connected by means ofa duct 16 (only partly shown) to extract air from the interior of hollow filter drum 4 for venting at 17.
  • the extraction of this air tends to reduce the pressure within the container 1 (a closure member being provided though not shown in the Figures) so as to establish a negative pressure differential between the interior and the exterior of the container 1; dust entrained in the atmosphere of the container thus is restrained against escape into the surrounding atmosphere.
  • dusting powder e.g. tale
  • electric motor 7 which speed setting preferably is adjustable
  • dusting powder pervades the atmosphere in the region of the inlet through valve 12 to air passageway 8 and impeller 9 and thence to the dusting nozzles.
  • An inlet 18 is provided for topping up the level of dusting powder in the hopper 3; as can be seen, the inlet 18 is screened by means of a screen 19 from the filter 4.
  • the drive motor 7 also rotates the air filter 4 which ensures that dusting powder accumulating on the filter is removed by scraper 5.
  • valve 12 determines the dusting density and this can be adjusted by adjusting the setting of control lever 13.
  • FIGS. 3 and 4 show another embodiment of the invention which in many respects is similar to the embodiment of FIGS. 1 and 2 and functions in an identical manner.
  • the same reference numerals have been used in FIGS. 3 and 4 as were used in FIGS. 1 and 2 to designate identical, like, or similarly functioning parts and it is considered that, beyond this, no further description of the embodiment of FIGS. 3 and 4 is required in order that it might be clearly understood.
  • FIGS. 5 and 6 show an embodiment of the invention adapted for the dusting of electrical cables subsequently to the provision on the individual conductors of the cable of electrically insulating rubber or synthetic plastics material and prior to the subsequent encapsulation of the multi-conducted cable in its outer electrically insulating sheath.
  • the apparatus of FIGS. 5 and 6 is similar to the previously described embodiments and, to emphasise this similarity and assist in understanding this embodiment, the same reference numerals are used in FIGS. 5 and 6 to identify like, similar or similarly functioning parts as were used in the preceding Figures.
  • FIGS. 5 and 6 therefore includes a container 1 having a dusting region 2 and a hopper region 3.
  • a cylindrical drum filter similar to that of the preceding embodiment is mounted in an upper extension of the container 1 but otherwise is identical to the drum filter of the preceding embodiments and serves the same function.
  • a rotary agitator 6 is provided in the hopper 3, however in this embodiment the agitator 6 serves to agitate the power in the hopper only to such an extent as to ensure that it does not become compacted, and is not intended to provide a dust laden atmosphere, since in this embodiment the article to be powered actually passes through the powder in the hopper. Furthermore.
  • An electric motor 7 drives the agitator 6 and the drum filter 4.
  • the agitator 6 in this embodiment comprises an axially rotatable cylindrical drum having throughout its curved surface a plurality of equally spaced parallel circular grooves 21 each provided to accommodate one conductor of an electrical cable in its passage through the apparatus, the conductors being passed underneath of the drum 20 as shown in FIG. 6.
  • the drum 20 itself will not provide any appreciable agitation of the powder in hopper 3, this function being provided by means of shaped side pieces 22 bolted to the ends of drum 20. These side pieces 22 have been found to provide sufficient agitation of the powder, but for different applications or where a less freely flowing powder is to be used otherwise shaped side pieces 22 could be provided or an additional separate agitator provided.
  • the electrical conductors to be powdered are guided into and out of the apparatus by means of guide rollers 23 and 24 mounted as shown and provided with circumferential grooves corresponding to those on the agitator drum 20.
  • the conductors enter and leave the apparatus through ports 25 (only one of which is shown) provided with a pair of opposed brushes 26 which serve as a crude air and powder seal such as to aid the establishment of a negative pressure differential within the interior of container 1.
  • a hinged lid 27 provides access to the container 1.
  • powdering apparatus incorporating means operative positively to inhibit the escape of dusting powder into the surrounding environment thereby enhancing operatives working conditions and reducing the risk of contraction of pneumoconiosis.
  • the present invention has hereto been described with particular reference to apparatus for applying dusting materials to articles which acquire a tacky or sticky surface during their manufacture, it will nonetheless be appreciated that, in its broadest aspects, the present invention has application to other processes involving the use of powders not necessarily for dusting purposes.
  • powders are widely used (e.g. in the production of pills and tablets) and it should be of paramount importance to ensure that such powders do not escape into the operative environment, not only to minimize the risk of contraction of pneumoconiosis, but also to minimize any risk resulting directly from exposure of the operatives to the pharmacological properties of the constituents of the powders.
  • the broadest aspect of the present invention i.e. the realization that the escape of powdered materials from enclosures can be minimized by maintaining a negative pressure differential between the interior and exterior of the enclosure, is applicable to a solution of this problem.
  • Dusting apparatus including an enclosed dusting chamber, a dusting material hopper, means to pervade the gaseous atmosphere within said hopper with dusting material contained therein, means to transfer dust laden air from said hopper to said dusting chamber for delivery to an article to be dusted therein, proportioning means to vary the relative proportions of dust and air in said dust laden air to vary the amount of dusting material delivered to the article, an air filter associated with said dusting chamber for extracting dusting material from air flowing through the filter, and means operative to extract air from said dusting chamber through said filter so as to tend to establish a negative pressure differential between the interior and the exterior of said chamber such that air entering said chamber from the exterior thereof aids the containment within said chamber of the dusting material.
  • said proportioning means comprises an impeller having a first inlet arranged to accept dust laden air, a second inlet arranged to accept relatively clean air, and at least one outlet arranged to deliver a mixture of said dust laden and said respectively clean air from said inputs to the article to be dusted.
  • said proportioning means further including valve means associated with said first and second inlets of said impeller to vary the relative proportions of dust laden air and relatively clean air in the said mixture delivered by said at least one outlet.
  • Dusting apparatus as claimed in claim 2 wherein said second inlet is arranged to accept relatively clean air from within said dusting chamber, and the location of said second inlet within said dusting chamber is variable to enable the dust content of air entering said second inlet to be adjusted.
  • Dusting apparatus as claimed in claim 3 wherein said second inlet is arranged to accept relatively clean air from within said dusting chamber, and the location of said second inlet within said dusting chamber is variable to enable the dust content of air entering said second inlet to be adjusted.
  • Dusting apparatus as claimed in claim 1 wherein said dusting material hopper is formed in the bottom of said dusting chamber, said air filter is contained within said dusting chamber, and means are provided for cleaning said air filter, dusting material cleaned off said air filter returning to said hopper.
  • Dusting apparatus as claimed in claim 6 wherein the air filter comprises a hollow cylindrical drum the curved surface area whereof constitutes the filtering area of the filter, and said drum is arranged for axial rotation past a scraper spaced a predetermined distance from the curved surface thereof.
  • Dusting apparatus including: an enclosed dusting chamber having a dusting material hopper formed in the bottom thereof, an agitator in said hopper to pervade the gaseous atmosphere therein with dusting material; an impeller having a first inlet arranged to receive dust laden air from one location in said hopper, a second inlet arranged to receive relatively clean air from another location in said dusting chamber.
  • valve means associated with said first and second inlets to vary the relative proportions of dust laden air and relatively clean air in said mixture; an air filter within said dusting chamber; and means to extract air from said dusting chamber through said air filter so as to tend to establish a negative pressure differential

Landscapes

  • Crushing And Pulverization Processes (AREA)
  • Breeding Of Plants And Reproduction By Means Of Culturing (AREA)
  • Nozzles (AREA)
  • Filtering Of Dispersed Particles In Gases (AREA)
US444872A 1973-02-23 1974-02-22 Powder applicator Expired - Lifetime US3886897A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB886473 1973-02-23

Publications (1)

Publication Number Publication Date
US3886897A true US3886897A (en) 1975-06-03

Family

ID=9860734

Family Applications (1)

Application Number Title Priority Date Filing Date
US444872A Expired - Lifetime US3886897A (en) 1973-02-23 1974-02-22 Powder applicator

Country Status (5)

Country Link
US (1) US3886897A (de)
JP (1) JPS5335665B2 (de)
DE (1) DE2408607A1 (de)
FR (1) FR2218950B1 (de)
IT (1) IT1004331B (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3027163A1 (de) * 1979-07-21 1981-02-12 Lucas Industries Ltd Bestaeubungsvorrichtung

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1926198A (en) * 1929-07-10 1933-09-12 Guenst William Sanitary powdering device
US2602417A (en) * 1948-10-21 1952-07-08 Hunter Penrose Ltd Dusting cabinet
US2688593A (en) * 1951-11-30 1954-09-07 Western Electric Co Apparatus for guiding filaments
US2875094A (en) * 1952-11-14 1959-02-24 Philips Corp Method of impregnating fibre masses with a viscous, hardenable resin insoluble in water
US3139044A (en) * 1962-01-18 1964-06-30 Herbert Cole Trust Dusting equipment
US3623453A (en) * 1968-12-18 1971-11-30 Konishiroku Photo Ind Developing apparatus for electrophotography

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1126620A (en) * 1965-11-12 1968-09-11 Aerocaat S A Improvements in or relating to methods and apparatus for applying powder coatings to articles
DE1962698A1 (de) * 1969-12-13 1971-06-24 Buettner Schilde Haas Ag Spruehkabine

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1926198A (en) * 1929-07-10 1933-09-12 Guenst William Sanitary powdering device
US2602417A (en) * 1948-10-21 1952-07-08 Hunter Penrose Ltd Dusting cabinet
US2688593A (en) * 1951-11-30 1954-09-07 Western Electric Co Apparatus for guiding filaments
US2875094A (en) * 1952-11-14 1959-02-24 Philips Corp Method of impregnating fibre masses with a viscous, hardenable resin insoluble in water
US3139044A (en) * 1962-01-18 1964-06-30 Herbert Cole Trust Dusting equipment
US3623453A (en) * 1968-12-18 1971-11-30 Konishiroku Photo Ind Developing apparatus for electrophotography

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3027163A1 (de) * 1979-07-21 1981-02-12 Lucas Industries Ltd Bestaeubungsvorrichtung

Also Published As

Publication number Publication date
FR2218950B1 (de) 1977-09-23
JPS49116654A (de) 1974-11-07
IT1004331B (it) 1976-07-10
JPS5335665B2 (de) 1978-09-28
DE2408607A1 (de) 1974-09-05
FR2218950A1 (de) 1974-09-20

Similar Documents

Publication Publication Date Title
US4094654A (en) Cabin for an electrostatic powder coating installation
IE903819A1 (en) A fluidized bed apparatus for making and/or processing¹pourable material
US5639033A (en) Insulation blower having hands-free metered feeding
US4634060A (en) Processing and sorting of refuse
US2601355A (en) Apparatus for impregnating pourable material such as chips, shavings, and fibrous material
US4199333A (en) Filter box for textile machines
CA1136514A (en) Tobacco metering and feeding system
EP0369974B1 (de) Methode und Apparatur zum Formen eines Absorptionskörpers
US5033166A (en) Method and device for the disposal of waste in a fiber cleaning machine
CA2185122A1 (en) Process and apparatus for recycling disposable diapers
JPH0322281B2 (de)
US3886897A (en) Powder applicator
PL103481B1 (pl) Urzadzenie elektrostatyczne do napylania powlok proszkowych
JP2608610B2 (ja) 乾燥ウエブ成形方法及びその成形装置
JP2766519B2 (ja) 繊維材料，特に綿花を開繊して除塵する装置
JP2016078891A (ja) 錠剤包装装置
IE48577B1 (en) Apparatus for distributing fibres uniformly over a conveyor surface
US3845863A (en) Pulp sifter with cleaning means
US5140935A (en) Fluidization arrangement for an electrostatic powder coating device
US4334494A (en) Dusting apparatus
US3085548A (en) Apparatus for continuous deposition of particulate material
CN216857294U (zh) 一种基于催化剂加工的造粒机
JPH04214417A (ja) 繊維材料、特に木綿の開繊及び除塵装置
US3374505A (en) Airline separator for seed cotton
US20080050518A1 (en) Device and Method for Coating Tablets by Means of One Rotatable Drum