EP1719619A2 - Méthode pour tendre une gaze pour utiliser en impression sérigraphique - Google Patents

Méthode pour tendre une gaze pour utiliser en impression sérigraphique Download PDF

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Publication number
EP1719619A2
EP1719619A2 EP06113218A EP06113218A EP1719619A2 EP 1719619 A2 EP1719619 A2 EP 1719619A2 EP 06113218 A EP06113218 A EP 06113218A EP 06113218 A EP06113218 A EP 06113218A EP 1719619 A2 EP1719619 A2 EP 1719619A2
Authority
EP
European Patent Office
Prior art keywords
gauze
pair
stretching
sides
corner
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Withdrawn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
EP06113218A
Other languages
German (de)
English (en)
Other versions
EP1719619A3 (fr
Inventor
Johannes Antonius Mackaay
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.)
Screensupport BV
Original Assignee
Screensupport BV
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 Screensupport BV filed Critical Screensupport BV
Publication of EP1719619A2 publication Critical patent/EP1719619A2/fr
Publication of EP1719619A3 publication Critical patent/EP1719619A3/fr
Withdrawn legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F15/00—Screen printers
    • B41F15/14—Details
    • B41F15/34—Screens, Frames; Holders therefor
    • B41F15/36—Screens, Frames; Holders therefor flat

Definitions

  • the invention relates to a method for stretching, i.e. tensioning, a gauze.
  • the invention in particular relates to a method for stretching a gauze for use in screen printing, wherein the gauze comprises a first pair and a second pair of opposed sides, which define an inner area of the gauze.
  • the invention also relates to a stretching device for stretching a gauze for screen printing.
  • a gauze of e.g. plastic material or steel is stretched in a steel or aluminium frame.
  • Said gauze is the carrier of a stencil, which may have been provided in various ways.
  • the stencil covers those parts of the gauze through which no printing ink must pass.
  • the open parts in the template do allow the ink to pass therethrough, so that a print can be formed on the substrate.
  • There are various kinds of printing ink for screen printing such as glass ink, paper/cardboard ink, ink for plastics and metal ink.
  • the ink is spread over the gauze with a first squeegee, as a result of which the meshes of the gauze are filled. Then the ink is pressed onto the substrate by means of a pressure squeegee.
  • FIG. 1 schematically shows a stretching table 100 comprising a frame 101 in which a gauze 110 is stretched.
  • the gauze 110 comprises a first pair of opposed sides 112, which define an inner area 113.
  • the central printing area is indicated at 114.
  • the gauze 110 is fixed in lateral clamps 102, which are disposed near the sides 111, 112 of the gauze 110. Then the gauze 110 is tensioned from the lateral clamps 102 by applying a tension force T in directions away from the gauze 110 as indicated by the arrows.
  • the gauze comprises a first pair and a second pair of opposed sides, which sides define an inner area of the gauze, wherein said first pair and said second pair of sides of the gauze are stretched before the inner area is tensioned.
  • the method comprises the steps of:
  • the above object is also accomplished by providing a stretching device adapted for stretching a gauze for use in screen printing, wherein the gauze comprises a first pair and a second pair of opposed sides, which sides define an inner area of the gauze, which stretching device comprises stretching means for stretching the first pair and the second pair of sides of the gauze before the inner area is tensioned.
  • the stretching device preferably comprises:
  • the non-straight orientation of the threads near the corners of the gauze (which orientation also affects the inner area of the gauze) obtained with the conventional stretching device is caused by the fact that the distance between the clamps 102 is greatest near the corners of the gauze, so that the highest tension is reached at these locations. It has become apparent that when the sides of the gauze are first tensioned before the inner area of the gauze is tensioned, the wall and weft threads will be oriented at right angles relative to each other over substantially the entire inner area in the tensioned condition of the gauze. This effect can be ascribed to the fact that space for stretching the inner area of the gauze is created near the corners of the gauze by first stretching the first and second sides at the corners of the gauze. The present method makes it possible to stretch or tension the gauze from the centre.
  • the method comprises the steps of stretching the first pair of sides and the second pair of sides with different tension forces, and the stretching device is adapted for stretching the sides of the first pair and the second pair with different tension forces.
  • Figs. 2A and 2B show a stretching device 1 comprising a frame 2 for stretching a gauze 10.
  • the gauze 10 comprises a first pair of opposed sides 11 and a second pair of opposed sides 12, which define an inner area 13 of the gauze 10.
  • the gauze 10 is rectangular in shape.
  • the dimension of the gauze 10 is 100 cm by 100 cm, for example.
  • the stretching device 1 comprises corner clamps 3, 4 disposed at or near the corners of the gauze 10, which corners are defined by the point of intersection of a side 11 of the first pair and a side 12 of the second pair.
  • the corner clamps 3 can be moved in a first direction I for stretching the sides 11.
  • the corner clamps 4 can be moved in a second direction II for stretching the sides 12 of the gauze 10.
  • the corner clamps 3, 4 are preferably moved by pneumatic, mechanical or hydraulic means.
  • the stretching device 1 furthermore comprises lateral clamps 5 provided near the sides 11, 12 of the gauze 10.
  • movable corner clamps 3, 4 other ways of stretching the sides 11, 12 of the gauze 10 are possible, such as moving only a part or means of the corner clamps 3, 4.
  • a clamp provided with a clamping element (not shown) that can be moved towards the corners of the gauze 10 for stretching the sides 11, 12.
  • the entire clamp or the clamping element can be moved for stretching the inner area 13 of the gauze 10.
  • the dimensions of the clamping element, at least the part thereof that clamps down the gauze 10, are preferably smaller than or equal to the width of the elements that form the frame 2. Another possibility is shown in Fig. 3, which will be discussed in more detail below.
  • the gauze 10 is placed in the corner clamps 3, 4 during a first phase.
  • the gauze 10 is not clamped down at the lateral clamps 5 yet so as to make it possible to realise an optimum stretching of the sides 11, 12 by means of the corner clamps 3, 4.
  • the corner clamps 3, 4 clamp down as small a portion of the sides 11, 12 as possible for stretching as large a portion of the sides 11, 12 as possible.
  • the corner clamps 3, 4 clamp down a portion of the sides 11, 12 smaller than or equal to the width of the elements of the frame 10.
  • the stretching of the sides 11, 12 takes place during a second phase, schematically indicated by the inner ring of clamps 3, 4, 5 in Fig. 2B, by moving the corner clamps 3, 4 over a distance of e.g. 4 cm in the directions I and II, respectively. This causes the sides 11, 12 of the gauze 10 to be stretched.
  • a third phase schematically indicated by the outer ring of clamps 3, 4, 5
  • the sides 11, 12 of the gauze 10 are subsequently placed or clamped in the lateral clamps 5 at the sides 11, 12, and the inner area 13 of the gauze is tensioned by stretching the gauze by means of the corner clamps 3, 4 and the lateral clamps 5 (see the arrows). Consequently, the warp and weft threads of the gauze 10 are oriented substantially at right angles relative to each other over a larger area of the gauze end than is the case with the conventional stretching method as shown in Fig. 1.
  • the stretching of the gauze is preferably carried out in such a manner that a stretch percentage in the range of 2-10% of the original thread length, e.g. 8%, is obtained.
  • the stretch percentage depends on factors such as the number of threads per unit length, the thickness of the threads and the kind of gauze.
  • the corner clamps 3, 4 are to that end moved in the direction I and II, respectively, during the second phase of the stretching process, in such a manner that the sides 11, 12 give 4% stretch at each respective corner clamp 3, 4.
  • the corner clamps 3, 4 and the lateral clamps 5 are then used in such a manner during the third phase that the threads in the inner area, too, exhibit 8% stretch.
  • the tension of the threads ranges between 10 and 40 Newton, e.g. 15, 20 or 25 Newton. This tension is substantially uniform over the entire inner area. This is advantageous, e.g. as regards the life of the gauze 10.
  • the tension determines the number of threads per unit length. For a gauze 10 comprising threads of plastic material with a diameter of 31 ⁇ m, which counts 165 threads per cm in untensioned condition, a tension of 22 Newton will result in about 152 threads per cm in the tensioned condition of the gauze 10.
  • tensioning can be carried out according to the stretch percentage to be obtained within a tolerance of three threads per cm.
  • the method according to the invention has a large number of advantages.
  • the substantially right-angled orientation of the warp and weft threads of the gauze 10 renders the gauze suitable for screen printing without the Moiré effect described in the non-prepublished European patent application EP 05101383 , which is considered to be incorporated in the present application by reference.
  • the right-angled orientation of the warp and weft threads of the results in uniform mesh dimensions of the gauze 10 over substantially the entire inner area 13. Consequently, the ink volume per mesh is substantially uniform over the inner area 13, making it possible to realise a reduced ink consumption. Furthermore it is possible to set up a greater tension in the gauze, which has a positive effect as regards the resolution of the screen printed image.
  • a very advantageous embodiment concerns the possibility to compensate for deviations in the gauze 10.
  • a gauze which has e.g. 167 warp threads per cm and 163 weft threads per cm in unstretched condition can have substantially the same number of warp and weft threads in stretched condition.
  • a stretch percentage of 9.2% is selected for the warp threads, for example, whilst a stretch percentage of 7% is selected for the weft threads, so that the number of threads will be 152 in both directions in the stretched condition.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Screen Printers (AREA)
  • Printing Plates And Materials Therefor (AREA)
EP06113218A 2005-05-04 2006-04-27 Méthode pour tendre une gaze pour utiliser en impression sérigraphique Withdrawn EP1719619A3 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL1028974A NL1028974C2 (nl) 2005-05-04 2005-05-04 Werkwijze voor het spannen van een gaas voor zeefdruk.

Publications (2)

Publication Number Publication Date
EP1719619A2 true EP1719619A2 (fr) 2006-11-08
EP1719619A3 EP1719619A3 (fr) 2008-06-04

Family

ID=35509314

Family Applications (1)

Application Number Title Priority Date Filing Date
EP06113218A Withdrawn EP1719619A3 (fr) 2005-05-04 2006-04-27 Méthode pour tendre une gaze pour utiliser en impression sérigraphique

Country Status (2)

Country Link
EP (1) EP1719619A3 (fr)
NL (1) NL1028974C2 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2570262A1 (fr) * 2011-09-16 2013-03-20 Askey Technology (Jiangsu) Ltd. Pochoir pour imprimer une pâte à souder sur carte de circuit imprimé
EP2570261A1 (fr) * 2011-09-16 2013-03-20 Askey Technology (Jiangsu) Ltd. Cadre de fixation et dispositif de fixation assemblé pour imprimer une pâte à souder sur carte de circuit imprimé
CN103042819A (zh) * 2011-10-13 2013-04-17 亚旭电子科技(江苏)有限公司 布锡于印刷电路板用的网板

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH280446A (de) * 1950-02-20 1952-01-31 Luescher Geb Einrichtung zum Aufspannen von Gaze auf Druckschablonenrahmen, insbesondere für den Textildruck.
US3391635A (en) * 1966-12-12 1968-07-09 M & M Res Engineering Inc Screen stretcher for printing apparatus
US3414994A (en) * 1965-01-25 1968-12-10 Jean Paul Jaccard Apparatus for fitting a taut screen to a frame

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH280446A (de) * 1950-02-20 1952-01-31 Luescher Geb Einrichtung zum Aufspannen von Gaze auf Druckschablonenrahmen, insbesondere für den Textildruck.
US3414994A (en) * 1965-01-25 1968-12-10 Jean Paul Jaccard Apparatus for fitting a taut screen to a frame
US3391635A (en) * 1966-12-12 1968-07-09 M & M Res Engineering Inc Screen stretcher for printing apparatus

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2570262A1 (fr) * 2011-09-16 2013-03-20 Askey Technology (Jiangsu) Ltd. Pochoir pour imprimer une pâte à souder sur carte de circuit imprimé
EP2570261A1 (fr) * 2011-09-16 2013-03-20 Askey Technology (Jiangsu) Ltd. Cadre de fixation et dispositif de fixation assemblé pour imprimer une pâte à souder sur carte de circuit imprimé
CN103042819A (zh) * 2011-10-13 2013-04-17 亚旭电子科技(江苏)有限公司 布锡于印刷电路板用的网板

Also Published As

Publication number Publication date
EP1719619A3 (fr) 2008-06-04
NL1028974C2 (nl) 2006-11-07

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