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
  • B05C11/00—Component parts, details or accessories not specifically provided for in groups B05C1/00 - B05C9/00
  • B05C11/10—Storage, supply or control of liquid or other fluent material; Recovery of excess liquid or other fluent material
  • B05C11/1042—Storage, supply or control of liquid or other fluent material; Recovery of excess liquid or other fluent material provided with means for heating or cooling the liquid or other fluent material in the supplying means upstream of the applying apparatus
• • 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
  • B05C17/00—Hand tools or apparatus using hand held tools, for applying liquids or other fluent materials to, for spreading applied liquids or other fluent materials on, or for partially removing applied liquids or other fluent materials from, surfaces
  • B05C17/005—Hand tools or apparatus using hand held tools, for applying liquids or other fluent materials to, for spreading applied liquids or other fluent materials on, or for partially removing applied liquids or other fluent materials from, surfaces for discharging material from a reservoir or container located in or on the hand tool through an outlet orifice by pressure without using surface contacting members like pads or brushes
  • B05C17/00576—Hand tools or apparatus using hand held tools, for applying liquids or other fluent materials to, for spreading applied liquids or other fluent materials on, or for partially removing applied liquids or other fluent materials from, surfaces for discharging material from a reservoir or container located in or on the hand tool through an outlet orifice by pressure without using surface contacting members like pads or brushes characterised by the construction of a piston as pressure exerting means, or of the co-operating container

Definitions

• Piston wiper plate for squeeze-out devices for bag smelters and bag smelters provided therewith
• the invention relates to a Kolbenabstreifplatte for a squeezing device for bag melter with a one axial top and one axial bottom having integral Abstreifplatte of elastically yielding material with a closed state in the relaxed state, the Abstreifplatte radially outer wiper edge.
• bag smelters In so-called bag smelters, a solid working substance packed in a packaging bag, such as a hot melt adhesive, is transferred in a cylindrical receiving space of a squeezing device at a discharge end for molten working substance by heating from a first solid to a flowable state, while from the rear end of the bag a squeezing piston in the receiving space in front- is driven so that melted working fluid is squeezed and the packaging bag is axially collapsed axially on the cylindrical wall of the receiving space.
• the extrusion piston is provided with a stripper plate.
• a low coefficient of friction between the stripper plate and the inner cylinder wall is desired.
• the stripper plate is usually made of an elastically yielding material such as a plastic and in particular of PTFE (such as Teflon®) preferred and also the cylindrical inner wall is coated with a similarly good sliding material.
• the problem underlying the invention is to change a piston stripper plate in such a way that its sealing and sliding properties remain within a predetermined framework even with more strongly changing temperatures.
• a Kolbenabstreifplatte is proposed with the features of claim 1. Thereafter, it is provided that in the stripper plate in its axial top and / or in its axial bottom and / or between its axial top and bottom at least one recess is inserted, which at least radial compression of Abstreifplat- te allows, and that at least one expandable return element is inserted or used in the at least one recess.
• thermally induced expansions of the stripper plate are no longer exclusively directed radially outwards.
• the recesses according to the invention which are usually perforations of the stripper plate between the axial top and bottom, allow in such a way that the reaction forces of thermal expansion lead to a reduction in volume of the recesses. Nevertheless, a sufficient radial expansion capability of the stripper plate is maintained, so that any temperature-induced radial expansion of the cylinder inner wall is still compensated.
• a "memory effect" is in the usual materials for stripper plates usually not available.To prevent a scraper plate clamped in the cylinder after thermal deformation of the at least one recess of the stripper misses their target size on re-cooling, ie not re-attained, is in the
• the combination of elastically yielding recesses of the worktop with expandable restoring elements means that a stripper plate according to the invention can reliably perform its intended function even after a large number of cycles of thermal change
• stripper according to the invention in various ways, and in particular to form the recesses in very different ways and to use a variety of expandable return elements:
• the one or more recesses are incorporated radially into the stripper plate, a particularly high degree of radial expansion or radial compression can be achieved.
• the segments of the worktop which are separated from each other by the radially extended recesses preferably remain connected at the radial outer edge. A radial interruption of the wiping edge, as is customary in piston rings of internal combustion engines, is therefore unnecessary. - A -
• Rubber-elastic materials are particularly suitable for the restoring elements; according to a preferred embodiment of the invention, they are designed roughly identically with the associated recesses and preferably have a certain excess in relation to the recess in the stripper plate. As a result, not only a secure hold of the expandable restoring element in the recess is ensured in a simple manner, but the stripper plate is radially radially outwardly clamped radially to a certain extent.
• the insertion opening of the cylindrical receiving space for the piston carrying the stripper plate has a substantially conical insertion region.
• FIG. 1 shows a bag melter in half-sided axial section with freshly inserted and filled packaging bag.
• Figure 2 shows the same device after complete squeezing melted working material from the receiving bag.
• Fig. 4A / B an alternative embodiment with feather-supported scraper or stripper plate in the pressureless or compressed state.
• the bag melter 10 shown in Figures 1 and 2 in two working positions comprises a receiving space 12 surrounded by a cylindrical inner wall 12A.
• the wall 12B enclosing the receiving space 12 forms opposite mouth ends 12C and 12D at their upper and lower working positions, respectively.
• the lower mouth end 12D is closed with an end plate 14 having a plurality of outlet openings 14A.
• a tightly filled with a hot melt adhesive 16 packaging bag 18 Within the receiving space 12 is (Fig. 1) a tightly filled with a hot melt adhesive 16 packaging bag 18.
• the packaging bag is tightly closed at its top in the drawing rear end 18A and at its lying in the drawing down front end 18B to form a Dispensing opening 18C fully open.
• This opening is usually done immediately before the onset of solid working substance tightly filled packaging bag 18 into the receiving space 12 from top to bottom, ie from the upper mouth end 12C ago.
• the squeezing device 20 for the packaging bag 18 can be removed in a suitable manner.
• the ejection device 20 comprises an extrusion piston 22, which is axially advanceable within the receiving space 12.
• the extrusion piston 22 has a scraping or stripping plate 24 (e.g., PTFE, e.g., Teflon®) and has a sharp-edged circumferential scraping edge 24A.
• PTFE e.g., Teflon®
• the receiving space 12 has in the region of its lower mouth end 12D via an annular constriction 40.
• This is embodied in the illustrated preferred embodiment as at the lower mouth end of the receiving space 12 on the wall 12B releasably attachable and / or placed on the end plate 14 or attached ring , This has on its the receiving space 12 side facing a conical, serving as a sealing surface 4OA wall.
• This acts self-centering on the packaging bag 18 when it is inserted into the receiving space 12.
• annular heating element 30 leads to a melting in the region 16A of the working substance 16
• the mouth edge zone 18D of the packaging bag 18 automatically applies to the conical sealing surface 4OA.
• the lateral pressure which the expanding working substance exerts on the edge zone 18D under the pressure of pressure is usually sufficient for this purpose.
• the extrusion piston 22 is further equipped with a head plate 26 which are connected via pressure springs 28 which are passed through the cocking plate 24, with the extrusion piston 22.
• This cross-sectional area of the top plate is less than that of the scraping plate 24, in such a way that an edge gap 26A between the outside edge of the top plate and the cylinder wall 12A of the receiving space 12 remains.
• This edge gap 26A is dimensioned so that the top plate 26 can penetrate into the zone constricted with respect to its cross section at the lower mouth end of the receiving space 12 by a predeterminable distance.
• the compression springs 24 are compressed under the pressure of the ejection piston.
• the pressure of the springs 28 is sufficient to advance the head plate into the constriction area and thereby squeeze out the last remains of working substance from the packaging bag, although the cocking plate 24 does not lower further, but stops before the beginning of the constriction 40.
• FIG. 3A shows a top view of a scraping or stripping plate 24, which reveals four apertures 24B arranged on a peripheral circle for the compression springs 28.
• a central opening 24C can be seen, from which radiate eight recesses 24D.
• the scraper or scraper plate 24 becomes slightly deformable radially, that is to say it is compressible and / or radially expandable by radial pressure directed towards the center.
• the scraping edge 24A subsequently abuts tightly against the cylindrical inner wall 12A of the receiving space 12. If the cross-section of the receiving space 12 in the region of the heating element 30 increases due to heating, the cross-section of the scraping or stripping plate 24 can follow this cross-sectional enlargement.
• a stripper plate according to the invention can be used successfully with a large number of pressing devices and for a multiplicity of different working materials.
• the working materials need not necessarily be in solid form and must be meltable and / or packaged in a packaging bag. Rather, a pasty working substance at room temperature can also be processed with a device according to the invention.
• the recesses for compression absorption and the return elements in the context of the invention can be varied in many ways.
• compression springs 42 are provided between the extrusion piston 22 and the scraping plate 24 in such a way that, in the unpressurized state (FIG. 4A), the scraping and stripping plate 24 is in the extended state with an axial stroke Keep distance from the extrusion piston.
• FIG. 4B the piston pressure of the extrusion piston 22 is transmitted to the scraping or stripper plate 24 by abutment with it.

Landscapes

• Containers And Packaging Bodies Having A Special Means To Remove Contents (AREA)
• Package Closures (AREA)
• Control And Other Processes For Unpacking Of Materials (AREA)
• Coating Apparatus (AREA)
• Sealing Devices (AREA)
• Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)

Priority Applications (6)

Applications Claiming Priority (2)

Publications (1)

Family

ID=40377558

Family Applications (1)

Country Status (8)

Families Citing this family (6)

Citations (9)

Family Cites Families (18)

• 2007
  • 2007-11-28 DE DE202007016706U patent/DE202007016706U1/de not_active Expired - Lifetime
• 2008
  • 2008-11-28 EP EP08855327A patent/EP2227338B1/de active Active
  • 2008-11-28 AT AT08855327T patent/ATE550107T1/de active
  • 2008-11-28 JP JP2010535298A patent/JP5435300B2/ja active Active
  • 2008-11-28 BR BRPI0819720-2A patent/BRPI0819720B1/pt active IP Right Grant
  • 2008-11-28 US US12/745,392 patent/US8496140B2/en active Active
  • 2008-11-28 CN CN2008801257330A patent/CN101925412B/zh active Active
  • 2008-11-28 WO PCT/EP2008/010135 patent/WO2009068311A1/de not_active Ceased

Patent Citations (9)

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