EP1297957A1 - Vorrichtung zum Auftragen von Puder - Google Patents

Vorrichtung zum Auftragen von Puder Download PDF

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Publication number
EP1297957A1
EP1297957A1 EP01123432A EP01123432A EP1297957A1 EP 1297957 A1 EP1297957 A1 EP 1297957A1 EP 01123432 A EP01123432 A EP 01123432A EP 01123432 A EP01123432 A EP 01123432A EP 1297957 A1 EP1297957 A1 EP 1297957A1
Authority
EP
European Patent Office
Prior art keywords
filter
conveyor
guiding element
powder
air
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.)
Withdrawn
Application number
EP01123432A
Other languages
English (en)
French (fr)
Inventor
Egil Norheim
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.)
Perma Press AB
Original Assignee
Perma Press AB
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 Perma Press AB filed Critical Perma Press AB
Priority to EP01123432A priority Critical patent/EP1297957A1/de
Publication of EP1297957A1 publication Critical patent/EP1297957A1/de
Withdrawn legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C19/00—Apparatus specially adapted for applying particulate materials to surfaces
    • B05C19/06—Storage, supply or control of the application of particulate material; Recovery of excess particulate material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41G—APPARATUS FOR BRONZE PRINTING, LINE PRINTING, OR FOR BORDERING OR EDGING SHEETS OR LIKE ARTICLES; AUXILIARY FOR PERFORATING IN CONJUNCTION WITH PRINTING
    • B41G1/00—Apparatus for bronze printing or for like operations

Definitions

  • a device has been developed by Perma Press AB that allows application of a coating powder (e.g. an adhesive powder) onto a base sheet at least partially covered with paint, and removal of any excess powder.
  • the mentioned device comprises a suction device arranged to force excess powder through the conveyor so that it can be collected in a compartment below the conveyor.
  • the air flow can pass around the cylinder along two different paths, one on the upstream side, and one on the downstream side. For this reason, it can be advantageous to arrange the cylinder with the opening facing downwards.
  • the base sheet is coated with powder at the upstream side, and then conveyed on the conveyor while excess powder is sucked through the conveyor by the suction device.
  • an air knife i.e. a device that directs a stream of air onto the conveyor and the base sheet, at the downstream side, for pushing the excess powder off the base sheet.
  • the filter and therefore the flow guiding element
  • the filter and flow guiding element are preferably arranged in a funnel shaped compartment, formed beneath the conveyor for collecting excess coating powder forced through the conveyor. As a result, any powder that leaves the air flow from the conveyor towards the filter will be collected in the compartment.
  • the inside of the compartment can be essentially equidistant with the outside of the flow guiding element on the downstream side of the filter. This further enhances the cyclone effect mentioned above, and improves the process of removing powder from the air stream.
  • Fig 1 is a perspective view of a machine incorporating a device according to the present invention.
  • Fig 2 is a partly cut away side view of the machine from direction II in fig 1.
  • Fig 3 is a partly exploded perspective view of the machine in fig 1.
  • Fig 4 is a partly cut away side view of the machine from direction III in fig 1.
  • the machine shown in fig 1 can be placed downstream the screen printing process itself. Preferably, the machine is located immediately after the printing process.
  • Base sheets are transported along the screen transfer line, passing different process steps, including the screen printing step, the adhesive powder application step and a drying/curing step.
  • the sheets are transported on a moving conveyor between the steps.
  • the base sheet is coated with a screen print ink, consisting of a screen print base to which colored pigmentation has been added.
  • each sheet can support one or several transfers.
  • the base sheet is in fact a continuous run, carried by the conveyor from one roll to another.
  • the transfers are printed on the run, and then rolled up on the second roll together with the run.
  • the screen transfer is a multi-color print, demanding a multiple printing process.
  • One way of accomplishing this is to let the base sheet pass along the mentioned printing line several times, each time applying a different colored layer of ink. If different areas of the screen transfer are printed one after the other in this way, each area is dried before the next color is applied.
  • the final ink layer normally being a pale shade such as white, or transparent, is however applied all over each transfer, so that the entire surface of each transfer is covered with wet paint.
  • the surface of each transfer is still tacky.
  • the machine 1 comprises a rigid structure 2 preferably made of welded steel profiles, supporting the different elements of the machine.
  • the structure is supported by wheels 3, making it easily movable.
  • a conveyor 4 is arranged substantially in the horizontal plane, and has a surface which permits the passage of powder particles.
  • a conventional belt conveyor can be used, comprising a belt of a flexible and permeable material, such as a net 5 or the like, supported by two bars 7, extending across the width of the machine.
  • the powder-applying device in the illustrated example includes a hopper 9, being filled with adhesive powder which is distributed through an opening down onto the base sheet and any transfers thereon.
  • the hopper can be arranged to vibrate, preferably in a direction transverse to the direction of travel A of the conveyor, thereby ensuring a satisfactory distribution of powder onto a base sheet 10.
  • fig 2 the machine 1 is shown from the downstream side, with the side of the machine partly removed. Inside the housing 11, is revealed the fan 22, sucking air through a filter 24 arranged in the compartment 16. In the illustrated example, the air flows from compartment 16, through the filter 24 to an adjacent chamber 25 connected to the fan with a protective boot 26. In order to accomplish an even distribution of the under-pressure across the conveyor, the filter preferably extends across the entire width of the compartment 16. According to the invention, a flow guiding element (shown in fig 3 and 4) is fitted around the filter.
  • the filter 24 can be connected to a high-pressure compression tank 28 through an air pipe 29.
  • the compression tank is arranged to regularly clean the filter 24 with a thrust of air, and is controlled by an electronic controller in box 14.
  • a removable powder collecting tray 18 connected to a cyclone 19 above the powder applying device with a powder supply line 20.
  • the compartment 16 is tapered towards the bottom forming a large funnel shape, leading down into the narrow tray 18.
  • the elongate tray 18 is arranged to be extractable out of the side of the machine 1, thereby enabling an operator to empty it.
  • Fig 3 shows the filter 24 and flow guiding element 27 in more detail.
  • the illustrated filter 24 is essentially cylinder shaped, and comprises an outer net cage surrounding a filter body of fiber material.
  • the fan is connected to the inner end, while the outer end is sealed, to ensure that all air is sucked through the periphery of the filter body.
  • the flow guiding element 27 is formed from a sheet of metal, plastic or other suitable material, which can be attached, e.g. welded or riveted, to the side walls 15 of the machine.
  • the flow guiding element has a cylindrical shape coinciding with the shape of the filter 24, but slightly bigger. It does not enclose the entire filter, but an axial opening 31 extends along the lower side of the cylinder.
  • the walls 32, 33 of the compartment 16 can be seen in fig 3. These walls are preferably comprised of metal, plastic or other suitable material, and can also be attached in the side walls 15.
  • the downstream inner wall 32 of the compartment 16 can be shaped to follow the curvature of the guiding element 27, thereby forming a passage 37 along the outside of the element.
  • Two rigid bars 34, 35, extending across the compartment 16, are attached, preferably welded or screwed, to the down stream compartment wall 32, and to the flow guiding element 27, respectively.
  • the filter 24 can be slided into place along the bars 34, 35, through the opening 13 in the side wall 15 of the machine, making it easy to change if needed.
  • the opening 31 defines an angular sector of approximately 45 degrees, and is located facing downwards, essentially in the sector between the bars 32.
  • the angular sector of the opening can be chosen and positioned differently.
  • a regulating plate 36 is fitted in the opening 31, extending along the length of the guiding element 27, and reaching closer to the inserted filter 24 than the flow guiding element 27.
  • the purpose of this plate 36 is to disrupt the flow of air passing around the flow guiding element, and to direct it downwards, towards the tray 18.
  • the regulating plate 36 can turnably mounted, so that it can be operated from the outside of the compartment 16.
  • a second path 42 leads along the downstream side of the guiding element 27, in the narrow passage 37 between the guiding element and the wall of the compartment 16.
  • the under pressure on this side is generally higher than on the other side, and particles following this path would be likely to be sucked into the filter had the guiding element 27 not been present.
  • the particles follow the flow of air around the surface of the guiding element 27, thereby being exposed to a centrifugal force, hurdling them against the wall 32.
  • the guiding element 27 and the wall 32 act like a cyclone. By forcing the particles against the wall 32, they are brought out of the strong air flow, and instead allowed to fall down towards the tray 18.
  • the powder collected by the tray 18 sucked into the tubes 20 and transported to the cyclone 9.
  • the cyclone brings the powder to circulate in a spiral shaped path towards the hopper 9 thereby improving the powder application process, and achieving a regular distribution of powder into the hopper 9.
EP01123432A 2001-09-28 2001-09-28 Vorrichtung zum Auftragen von Puder Withdrawn EP1297957A1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP01123432A EP1297957A1 (de) 2001-09-28 2001-09-28 Vorrichtung zum Auftragen von Puder

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP01123432A EP1297957A1 (de) 2001-09-28 2001-09-28 Vorrichtung zum Auftragen von Puder

Publications (1)

Publication Number Publication Date
EP1297957A1 true EP1297957A1 (de) 2003-04-02

Family

ID=8178786

Family Applications (1)

Application Number Title Priority Date Filing Date
EP01123432A Withdrawn EP1297957A1 (de) 2001-09-28 2001-09-28 Vorrichtung zum Auftragen von Puder

Country Status (1)

Country Link
EP (1) EP1297957A1 (de)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103171275A (zh) * 2013-04-02 2013-06-26 绍兴市宏大电器有限公司 撒粉机回收循环系统
CN103171274A (zh) * 2013-04-02 2013-06-26 绍兴市宏大电器有限公司 撒粉机
DE202015009351U1 (de) 2015-10-09 2017-03-16 Robert Wunderlich & Marco Wunderlich GbR (vertreten durch Robert Wunderlich, 07554 Gera) Vorrichtung zum Applizieren eines Pulvers

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1696171A (en) * 1926-08-06 1928-12-18 Lipsius Samuel Automatic powdering machine
FR723944A (fr) * 1931-10-05 1932-04-16 American Mach & Foundry Perfectionnements aux collecteurs de bronze pour les mécanismes d'impression des machines à fabriquer les cigarettes

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1696171A (en) * 1926-08-06 1928-12-18 Lipsius Samuel Automatic powdering machine
FR723944A (fr) * 1931-10-05 1932-04-16 American Mach & Foundry Perfectionnements aux collecteurs de bronze pour les mécanismes d'impression des machines à fabriquer les cigarettes

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103171275A (zh) * 2013-04-02 2013-06-26 绍兴市宏大电器有限公司 撒粉机回收循环系统
CN103171274A (zh) * 2013-04-02 2013-06-26 绍兴市宏大电器有限公司 撒粉机
CN103171275B (zh) * 2013-04-02 2015-10-14 绍兴市宏大电器有限公司 撒粉机回收循环系统
CN103171274B (zh) * 2013-04-02 2015-11-18 绍兴市宏大电器有限公司 撒粉机
DE202015009351U1 (de) 2015-10-09 2017-03-16 Robert Wunderlich & Marco Wunderlich GbR (vertreten durch Robert Wunderlich, 07554 Gera) Vorrichtung zum Applizieren eines Pulvers
DE102015219584A1 (de) 2015-10-09 2017-04-13 Robert Wunderlich & Marco Wunderlich GbR Vorrichtung zum Applizieren eines Pulvers
DE102015219584B4 (de) 2015-10-09 2023-03-02 Robert Wunderlich & Marco Wunderlich GbR Vorrichtung zum Applizieren eines Pulvers

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