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Screen printing equipment and method

A screen and equipment technology, applied to screen printing machines, printing, printing machines, etc., can solve problems such as reducing the production volume of screen printing machines

Active Publication Date: 2011-12-07
ASM ASSEMBLY SYST SINGAPORE PTE LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] These screen cleaning units are effective, but require the printing operation to be stopped in order to perform the cleaning operation, thus reducing the throughput of the screen printing press

Method used

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  • Screen printing equipment and method
  • Screen printing equipment and method
  • Screen printing equipment and method

Examples

Experimental program
Comparison scheme
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Embodiment Construction

[0046] figure 1 4 shows a screen printing apparatus according to a first embodiment of the present invention.

[0047] The screen printing apparatus comprises a frame support 7 supporting a printing screen unit 9 such that the printing screen unit 9 can move between a first and a second printing position, which will be described in detail below.

[0048] In this embodiment, the frame support 7 includes a frame support part 11 and a drive mechanism 13, the printing screen unit 9 is movably supported on the frame support part 11, here supported on a guide rail, and the drive mechanism 13 The printing screen unit 9 can be moved between a first and a second printing position.

[0049] The printing screen unit 9 comprises a frame 17, which in this embodiment is elongated in the shape of a rectangle, and a screen sheet 19, to which the printing sheet 19 is supported in tension.

[0050] In this embodiment, the stencil sheet 19 comprises a sheet of metal or plastic, but may compris...

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PUM

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Abstract

A screen printing apparatus and method for printing deposits of a print medium on workpieces, the apparatus comprising: a frame support unit for supporting a printing screen unit which comprises a screen sheet which includes at least first and second patterns of print apertures; a workpiece support unit; a print head unit; and at least one screen cleaning unit; wherein the at least one screen cleaning unit and the print head unit are operated in parallel, whereby, when the printing screen unit is in the first printing position, the at least one screen cleaning unit cleans the underside of the screen sheet at a location corresponding to one of the first and second sets of print apertures and the print head unit prints print medium onto workpieces through the other of the first and second sets of print apertures.

Description

technical field [0001] The present invention relates to screen printing apparatus and methods for printing a deposit of printing medium onto a workpiece (typically a substrate such as a circuit board or wafer) by means of a printing screen (or commonly referred to as a stencil or foil). Background technique [0002] In the screen printing process, especially in the SMT industry, the printing hole is usually blocked due to the printing medium flowing out between the printing screen and the workpiece drying on the surface of the printing screen and collecting in the printing hole. The accumulation of printing medium on the printing screen will thus lead to gradual contamination of the printing screen. [0003] Current screen printing machines incorporate a screen cleaning unit which is operated periodically to clean the underside of the printing screen. These screen cleaning units collect excess print media removed from the printing screen by applying a solvent, a screen clea...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H05K3/12B41F35/00
CPCH05K3/26B41F35/005B41P2235/27H05K3/1216B41F15/0881B41P2235/24B41F15/0813B41F35/003
Inventor J·R·威尔舍尔M·西蒙斯
Owner ASM ASSEMBLY SYST SINGAPORE PTE LTD
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