WO1996037367A1 - Rouleau-raclette constitue de plastique renforce par des fibres - Google Patents

Rouleau-raclette constitue de plastique renforce par des fibres Download PDF

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Publication number
WO1996037367A1
WO1996037367A1 PCT/NL1996/000203 NL9600203W WO9637367A1 WO 1996037367 A1 WO1996037367 A1 WO 1996037367A1 NL 9600203 W NL9600203 W NL 9600203W WO 9637367 A1 WO9637367 A1 WO 9637367A1
Authority
WO
WIPO (PCT)
Prior art keywords
squeegee
fibre
reinforced plastic
screen printing
weight
Prior art date
Application number
PCT/NL1996/000203
Other languages
English (en)
Inventor
Thomas Maria Jonkers
Huibert Johan Van Den Heuvel
Original Assignee
Stork Brabant B.V.
Stork X-Cel B.V.
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 Stork Brabant B.V., Stork X-Cel B.V. filed Critical Stork Brabant B.V.
Priority to DE69607957T priority Critical patent/DE69607957T2/de
Priority to AT96915223T priority patent/ATE192079T1/de
Priority to EP96915223A priority patent/EP0828610B1/fr
Publication of WO1996037367A1 publication Critical patent/WO1996037367A1/fr

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F15/00—Screen printers
    • B41F15/14—Details
    • B41F15/44—Squeegees or doctors

Definitions

  • the invention relates to a squeegee for screen printing devices, in particular rotary screen printing devices.
  • Squeegee systems provide for the supply and distribution of printing paste within stencils of rotary screen printing devices.
  • the printing paste is applied to the substrate to be printed through the apertures of the stencil using a squeegee blade.
  • the squeegee systems used hitherto are assembled from plates and tubes of stainless-steel or aluminium.
  • the separate components, and also the assembly thereof, have to satisfy a number of physical and chemical requirements.
  • One of these relates to the (flexural) stiffness.
  • the squeegee has to retain its shape under the loading occurring during use as a consequence of the squeegee force, frictional force and the inherent weight of the squeegee. Considerable bending of the fitted squeegee has to be avoided with a view to printing quality, in particular to paste yield. An important factor in this connection is the weight of the squeegee.
  • the weight of the squeegee is of importance to the operating staff of the printing device.
  • the squeegee also has to be replaced.
  • the handling of a squeegee is, however, difficult as a consequence of the weight, relative to the length thereof, which may be more than 3 metres, and the small diameter of the stencil in which the squeegee has to be received.
  • the risk of damage to the squeegee and/or the stencil is therefore not inconsiderable.
  • EP-A-0 612 615 discloses a device for suspending a squeegee in a cylindrical screen of a rotary screen printing apparatus, wherein one of the squeegee supports is provided with a guide element for guiding one end of the squeegee into an accommodation opening during mounting of the squeege ⁇ in the cylindrical screen, thereby enabling the mounting by one person.
  • EP-A-0 533 053 discloses a stencil mounting for rotary screen printing devices, wherein the mounting of a stencil is simplified by a specially configured receiving ring of the stencil mounting, as a result of which the operator has one hand free and/or allowing automation of the mounting.
  • EP-A-0 463 699 a device for changing a squeegee
  • a device for changing a squeegee comprising a horizontal guide placed on a stand and a carriage, which is displaceable along the guide and upon which means for gripping the end part of a squeegee are fixed, thereby reducing the loading imposed on the back and arms of the operator during the replacement of the squeegee.
  • Another system known in the art comprises a small roller, which supports the squeegee during replacement, as a result of which the operator has to carry a less heavy weight.
  • Still another rotary screen printing system is known in the art, wherein the configuration thereof allows for the vertical displacement of the assembly of screen and squeegee in order to change colours, screens etc..
  • a brochure "Kompromifilos in Qualitat un machining” of Maschinenbau Kiefersgelden GmbH, relating to MBK textile machines See e.g. a brochure "Kompromifilos in Qualitat un machining" of Maschinenbau Kiefersgelden GmbH, relating to MBK textile machines.
  • the object of the present invention is to provide a squeegee for application in a screen printing device, which does not have the above mentioned disadvantages.
  • an object of the present invention is to provide such a squeegee, whose manipulability has been increased.
  • an object of the invention is to provide a squeegee whose flexural stiffness has been increased.
  • a further object of the invention is to provide a squeegee whose stiffness and weight ratio has been improved.
  • the squeegee for screenprinting devices is characterized in that the squeegee is composed at least partially of a fibre-reinforced plastic.
  • a squeegee satisfies the abovementioned objectives.
  • a squeegee composed at least partially of fibre- reinforced plastic can be manufactured with a lower weight than a conventional squeegee manufactured entirely from aluminium or stainless steel, as a result of which the manipulability is increased to a great extent.
  • the weight saving can amount to approximately 70% for a constant flexural stiffness, depending on the configuration of the squeegee, the number of components manufactured from fibre- reinforced plastic in the squeegee and the nature of the fibre-reinforced plastic.
  • the flexural stiffness of a conventional squeegee can furthermore be increased by, for example, reinforcing its most heavily loaded components with the fibre- reinforced plastic.
  • squeegees often the blades thereof, made from fibre-reinforced plastic, for application in paper aking machines are known per se, e.g. from US-A-4 549 933, DE- Ul-91 13 542.7 and EP-A-0 454 404.
  • these squeegees having a fibre-reinforced plastic blade are used to remove paper and the like, for example from rolls.
  • a squeegee having a plastic squeegee blade for printing applications, in particular flexography ' is known from FR-A-2 707 918. None of these publications is directed to screenprinting squeegees.
  • a combination effect i.e. a weight saving and an increase in the flexural stiffness
  • the physical properties of plastic alone are in general insufficient to satisfy the strength requirements, in particular in relation to the flexural stiffness, to be imposed on a squeegee.
  • the plastic therefore has to be reinforced with fibres.
  • the (volume) percentage of fibres and the orientation of the fibres are factors which influence the physical properties of the fibre-reinforced plastic.
  • the ratio of the density and the modulus of elasticity of the fibre-reinforced plastic determines the weight saving to be achieved and the flexural stiffness to be achieved compared with a conventional squeegee having the same structure.
  • the squeegee may be composed in its entirety of a fibre-reinforced plastic, or one or more components of the squeegee, for example the supporting centre part and/or the paste distribution tube, may be manufactured from fibre- reinforced plastic, while the other components are composed of conventional materials.
  • a laminated structure for example a metal core with plastic wrapped thereon, is also included in the possibilities. The weight saving in the case of a squeegee manufactured in its entirety from fibre- reinforced plastic will be greater than in the case of a composite squeegee made of stainless steel and/or aluminium and fibre-reinforced plastic.
  • the plastic can be selected from known materials, for example polyester, vinyl ester and epoxy resins. The last two have a greater chemical resistance and are consequently preferable.
  • the fibre can also be selected from known materials, such as glass fibres, carbon fibres and ara id fibres. Carbon fibres are preferred from the point of view of the favourable ratio of the density and the modulus of elasticity with respect to that of the conventional materials. Glass fibres and aramid fibres are, however, more advantageous from the point of view of cost price than carbon fibres. Combinations of a plurality of fibres in the plastic or components made of plastic reinforced with different fibres can also be used. The orientation of the fibres is not particularly limited.
  • the fibres are mainly orientated in the longitudinal direction of the squeegee in order to enhance the flexural stiffness thereof perpendicular to the longitudinal axis, thereby further reducing the bending of the squeegee.
  • a light-weight squeegee is of importance for broader types of screenprinting machines, that is to say for widths of 3 to 4 metres or more.
  • a low squeegee weight is also of importance for the sheet-fed printing press (European Patent Application 93200783.4) because, in that case, the squeegee has to be lifted during every revolution of the stencil in order to allow the intermediate bar to pass. This operation has to be carried out quickly and a low squeegee weight is therefore desirable.
  • the fibre-reinforced plastic also has to satisfy other standard requirements imposed on squeegees, such as wear resistance to the printing pastes, (impact/drop) loading during squeegee — D —
  • the components of the squeegee can be manufactured with the aid of conventional techniques, such as pultrusion, from fibre-reinforced plastic and then assembled.
  • the invention furthermore relates to a screen printing device which is provided with a squeegee according to the invention.
  • Figures 1 - 6 are diagrammatic sections of different embodiments of a squeegee according to the invention which have been manufactured at least partially from fibre-reinforced plastic.
  • FIG 1 shows diagrammatically a conventional configuration of a squeegee for use in a rotary screen printing system.
  • the squeegee comprises a centre part 1 as support, which is provided at both ends with end parts (not shown), a distribution tube 2 for printing paste 3, an overflow groove 4 and a squeegee blade 5 which is mounted in a conventional manner in a squeegee blade holder 6.
  • the squeegee is disposed in a stencil 7.
  • the printing paste 3 is applied to a web 8 of material to be printed through the apertures in the stencil 7 with the aid of the squeegee blade 5.
  • Figure 2 shows another known squeegee configuration 21 made of a conventionally used material, which configuration is, however, stiffened with the aid of bars 22 made of fibre-reinforced plastic. Such an embodiment yields an appreciably smaller improvement in the weight and stiffness ratio.
  • Figures 3 - 5 show other embodiments in which various components of the squeegee are composed of fibre- reinforced plastic.
  • the correct material and the appropriate manufacturing method can be selected for each component, which results in a simpler and cheaper structure of the components.
  • a squeegee assembled therefrom can also satisfy higher requirements as a result of optimization of the components. Further advantages of such embodiments, such as greater diversity in shape with a limited number of components, possible alterations for each component and lower costs for moulds, patterns and the like, are related to the modular structure.
  • Figure 3 shows such an embodiment 31 of a squeegee according to the invention whose centre profiled section 32 comprises a core of metal 33 with an encasement 34 wound thereon of fibre-reinforced plastic.
  • the metal core 33 is reinforced, in this example, with reinforcing ribs 36, 37 respectively.
  • the metal of the core 33 can optionally be replaced by other materials such as plastic (foam) .
  • the centre part 42 of the squeegee 41 is composed of a commercially obtainable carbon-fibre- reinforced plastic hollow profiled section, while the separate distribution tube 43 is manufactured from another material.
  • Figure 5 shows a similar hollow profiled section 52 having a rectangular section of the squeegee 51, in which, however, provisions are provided for the attachment of the remaining squeegee components.
  • Such profiled sections will have to be specially fabricated.
  • a cylindrical hollow profiled section (not shown) having such attachment means can be shaped in a simple manner.
  • the end parts will conventionally be manufactured from metal because the attachment of the squeegee to the frame of the system and also the coupling to the paste supply lines can take place more advantageously as a result.
  • the paste distribution systems can also be manufactured from the fibre-reinforced plastic, depending on the complexity of the duct system present therein. Replaceability of said systems in connection with various viscosities of other pastes and varying width of the material to be printed is also advantageous. Unduly large tolerances in the straightness of the supporting centre part can be obviated by a straight assembly of the squeegee-blade holder, a clamping mechanism, on the hollow profiled section, as shown in Figures 3 - 5.
  • FIG. 6 shows a configuration 61 which is comparable to Figure 1 and is composed of an integral centre part 62 which also comprises the paste distribution tube 63.
  • the entire squeegee, including the end parts, except the squeegee blade 5 is manufactured in one piece from a carbon-fibre-reinforced epoxy resin.
  • the squeegee constructed in this way yields a weight saving of approximately 70% with respect to a squeegee manufactured from stainless steel.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Screen Printers (AREA)
  • Printing Plates And Materials Therefor (AREA)
  • Fishing Rods (AREA)
  • Golf Clubs (AREA)
  • Laminated Bodies (AREA)

Abstract

L'invention porte sur un rouleau-raclette utilisable dans des dispositifs de sérigraphie et constitué, au moins en partie, de plastique renforcé par des fibres. L'emploi, dans un rouleau-raclette, d'un tel plastique au lieu de l'acier inoxydable ou de l'aluminium utilisés dans les rouleaux classiques, l'allège et lui confère davantage de maniabilité. Il est possible, de surcroît, en employant ce plastique, de renforcer la résistance à la flexion, ce qui a pour effet d'améliorer la qualité de l'impression. Il est possible de réaliser cette économie de poids et d'obtenir une résistance accrue à la flexion par un choix judicieux du matériau plastique renforcé par des fibres qui aura un rapport amélioré densité/résistance à la flexion.
PCT/NL1996/000203 1995-05-24 1996-05-17 Rouleau-raclette constitue de plastique renforce par des fibres WO1996037367A1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
DE69607957T DE69607957T2 (de) 1995-05-24 1996-05-17 Rakel, hergestellt aus faser-verstärktem kunststoff
AT96915223T ATE192079T1 (de) 1995-05-24 1996-05-17 Rakel, hergestellt aus faser-verstärktem kunststoff
EP96915223A EP0828610B1 (fr) 1995-05-24 1996-05-17 Racle constitue de plastique renforce par des fibres

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NL1000437 1995-05-24
NL1000437A NL1000437C2 (nl) 1995-05-24 1995-05-24 Rakel uit vezelversterkte kunststof.

Publications (1)

Publication Number Publication Date
WO1996037367A1 true WO1996037367A1 (fr) 1996-11-28

Family

ID=19761075

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/NL1996/000203 WO1996037367A1 (fr) 1995-05-24 1996-05-17 Rouleau-raclette constitue de plastique renforce par des fibres

Country Status (6)

Country Link
EP (1) EP0828610B1 (fr)
AT (1) ATE192079T1 (fr)
DE (1) DE69607957T2 (fr)
ES (1) ES2146881T3 (fr)
NL (1) NL1000437C2 (fr)
WO (1) WO1996037367A1 (fr)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4549933A (en) * 1983-07-05 1985-10-29 Thermo Electron Corporation Doctor blade with non-homogeneous stiffness properties
EP0454404A1 (fr) * 1990-04-23 1991-10-30 Albany International Corp. Lame racleuse et son procédé de montage dans des portes-racles de machines à papier ou carton
DE9113542U1 (de) * 1991-10-31 1992-06-17 J.M. Voith Gmbh, 7920 Heidenheim Schaber
FR2707918A1 (fr) * 1993-07-19 1995-01-27 Chevreux Pierre Racle plastique pour l'essuyage de cylindres de machines d'impression.

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT405040B (de) * 1995-05-18 1999-04-26 Zimmer Maschinenbau Gmbh Einrichtung zum verteilen fliessfähiger medien

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4549933A (en) * 1983-07-05 1985-10-29 Thermo Electron Corporation Doctor blade with non-homogeneous stiffness properties
EP0454404A1 (fr) * 1990-04-23 1991-10-30 Albany International Corp. Lame racleuse et son procédé de montage dans des portes-racles de machines à papier ou carton
DE9113542U1 (de) * 1991-10-31 1992-06-17 J.M. Voith Gmbh, 7920 Heidenheim Schaber
FR2707918A1 (fr) * 1993-07-19 1995-01-27 Chevreux Pierre Racle plastique pour l'essuyage de cylindres de machines d'impression.

Also Published As

Publication number Publication date
NL1000437C2 (nl) 1996-06-19
DE69607957D1 (de) 2000-05-31
ES2146881T3 (es) 2000-08-16
ATE192079T1 (de) 2000-05-15
EP0828610B1 (fr) 2000-04-26
EP0828610A1 (fr) 1998-03-18
DE69607957T2 (de) 2000-08-17

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