• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:

    公开号:NL2004844A
    申请号:NL2004844
    申请日:2010-06-08
    公开日:2010-12-13
    发明作者:Mike Becker；Dietmar Lutke-Notarp
    申请人:Nb Technologies Gmbh；
    IPC主号:
    专利说明:

    SCREEN PRINT
    The invention relates to a screen printing form having a first layer as a template carrier with first recesses and a second layer as a template with second recesses which is fixedly connected to the first layer.
    During the screen printing or the pressing method, a printing medium is applied to a screen printing form, wherein the printing medium is subsequently conveyed through recesses of the screen printing form by means of a squeegee guided at the top or very close to the top of the screen printing form. There are screen printing forms which have a screen printing stencil carrier with first recesses which are designed such that they extend from a top to the bottom of the screen printing stencil carrier. On the underside of the screen-printing template carrier, a screen-printing template can then be provided which is provided with two recesses, the second recesses being at least partly in overlap with the first recesses of the screen-printing template carrier. By a single or multiple squeegee movement over the screen-printing stencil carrier, it is possible to transport the printing medium through the first recesses and second recesses to a substrate placed underneath. No printing medium is introduced at the areas covered by the screen printing template, so that a printing image is formed on the substrate which essentially corresponds to the recesses of the screen printing template.
    Screen printing and the use of screen printing forms have long been known and of proven quality. With increasing miniaturization of strips to be printed, for example for a solar cell, the problem arises, however, of being able to transport the printing medium through a narrow printing form through the then narrow recesses. In the case of electrically conductive narrow strips, it may further be desirable that the electrical conductivity be as low as possible. This can be achieved by pressing a narrow strip relatively high. In screen printing, it is currently simply reasonable to print a strip whose height has a size that corresponds, for example, to 20% of the size of the width of the web. This corresponds to a ratio between height and width of the printed strip of 1: 5. However, if the lowest possible electrical conductivity with a small surface area of the printed strip on the substrate is desired, the ratio between height and width of the strip should be at least 1: 2, 1: 1 or more, for example 2: 1 . Such a requirement exists in the metallization of solar cells, in which the width of the printed metal strips must be as small as possible in order to shield a small solar cell surface and to provide as large a surface as possible for the conversion of solar energy into electrical energy. .
    If with a screen printing form a narrow strip with a width of less than 60 micrometres and with a low height is to be printed, there is generally the problem of producing such a narrow strip with a reproducibly low height with the screen printing technique. Narrow and thin metallizations, for example with silver, can be used in the metallization of solar cells as a starting layer for subsequent coatings by means of galvanic processes. The raetallization height for the starting layer hereby only needs to be a few hundred nanometers, although this is with currently available screen printing forms is not feasible. This goal cannot be achieved either by illuminating photosensitive layers as a screen printing template or by applying etching technology. Although there is another printing technique, such as, for example, the inkjet technique, with which low metailization heights can be manufactured, such a technique is relatively expensive and unreliable, because; the nozzles are often clogged and this makes printing impossible. Thus, it is an objective to provide a screen printing form whose minimum structure size is not limited by the structural technology of the screen printing journals, and with which the printing strips are printed with a width of less than 60 micrometers can be reproducibly and cheaply manufactured. Another object of the invention is to realize printing strips with a width of less than 60 micrometres at a given slenderness ratio between height and width of an aperture of the screen printing template depending on application with a large or small printing strip height.
    The objectives are achieved by the subject matter of the independent conclusion. Favorable embodiments of the invention are the subject of the claim claims.
    The screen printing form according to the invention is provided with: a first layer as a screen printing template carrier, the first layer being provided with first recesses which are designed such that they extend from an upper side to the lower side of the first layer, a second layer as a screen printing template which preferably a metal masking layer is provided which is fixedly connected to the underside of the first layer, the second layer being provided with second recesses which at least partly coincide with the first recesses of the first layer such that a printing medium passes through the first recesses of the the first layer can be transported from the top thereof through the second recesses of the second layer in the direction of the bottom side and on a substrate which can be placed underneath, the surfaces of the first and / or second recesses being provided with a coating having a thickness possessing at least 5% of the smallest cross-sectional binneri width of the respective recess,
    Preferably, the ratio between the total height of the screen-printing form and the largest cross-sectional inner width of the first and / or second uncoated recess is less than 1: 1 and the ratio between the total height of the screen-printing form and the largest cross-sectional interior width. of the first and / or second coated recess greater than 1: 1.
    The recesses in the screen printing form can thus be manufactured with hitherto customary dimensions, the coating in the recesses greatly reducing the remaining passage opening. With such a relatively thick coating it is possible to form a remaining passage opening of less than 60 micrometres for a printing medium, so that with such a screen printing template also narrow printing strips with a width of less than 60 micrometres can be manufactured.
    The surfaces of the first and / or second recesses are preferably provided with a coating which has a thickness that is at least 20% of the smallest cross-sectional inner width of the respective recess.
    According to an embodiment of the invention, the coating has a contact angle to water in a range of 0 * to 90 °. With a contact angle is meant the angle that a liquid droplet forms on the surface of a solid relative to this surface. At a contact angle in the range of 0 ° to 90 °, therefore, the liquid or pasty printing medium interacts relatively well with the surface of the coating, so that the major part of the printing medium adheres to the recesses thus coated when the screen printing form is removed from the substrate to be printed. Therefore, only a relatively low pressure layer remains on the substrate, so that a narrow and at the same time low pressure strip can be manufactured.
    A galvanic starting layer which is realized with screen printing of silver pastes * can be reliably applied, for example, at a thickness of 1 micron. From a technical and economic point of view, the thickness need not be greater than 2 micrometers to 5 micrometers, in particular when the printing medium is expensive and more material is not required for the function of the product to be manufactured.
    If the coating has a contact angle to water in a range of greater than 30 ° to 150 °, only a slight interaction of the printing medium results. with respect to the surface of the coating. In such a case, a printing medium disposed in the recesses only remains in a small part in the recesses when the screen printing form is removed from the substrate. The result is a narrow print strip with. a width of less than 60 micrometres and a height that can be equal to the height of the screen printing form. Thus, it is possible that the printing strip has a height to width ratio in the range of 1: 1 or greater.
    Other advantages and features of the invention are explained with reference to the following figures, and. Herein: Figure 1 shows a cross-section of a first embodiment of the screen-printing form according to the invention with a bed; figure 2 shows a cross-section of a second embodiment of the screen-printing form according to the invention with a printed substrate; figure 3 shows a cross-section of a third embodiment of the screen-printing form according to the invention with a printed substrate; Figure 4 shows a cross-section of a fourth embodiment of the screen-printing form according to the invention with a printed substrate.
    Figure 1 shows a screen-printing form 1 which has a first layer 2 as a screen-printing template carrier with a first recess 4 and a second layer 3 as a screen-printing template with a second recess 5. The first recess 4 and second recess 5 have the same cross-sectional inner width 8, wherein they are placed mutually overlapping. Provided in both recesses 4 and 5 is a covering 6 which reduces the remaining inner width of the recesses 4 and 5. In this embodiment, the covering 6 is arranged along the entire recess wall and has a thickness 9, so that the remaining cross-sectional inner width 31 of the recesses 4 and 5 is smaller than the width 0 with the double carriage of the covering thickness 9.
    When, for example, by means of a doctor blade pulled along the upper side of the screen-printing stencil carrier, a printing medium 30 is provided in the recesses 4 and 5 provided with the coating 6, the printing level medium 30 reaches a substrate 20 arranged under the screen-printing form 1. embodiment, a contact angle to water in a range of greater than 90 ° to 150 °. This results in only a slight interaction between the pressure level 30 and. the surface of the coating 6, so that after removing the screen printing form 1 from the substrate 20, see arrow 50, a printing layer 31 remains behind. has a height 10 and a width 11. The width 11 corresponds to the remaining cross-sectional area of the cross-section. of the coated recesses, the height 10 corresponding to. the height 7 of the screen printing template 1. As can be seen in figure 1, with such a screen printing form 1 for the printing layer 31 a ratio between height and width of more than 1: 1 can be achieved, although the ratio between, the total height 7 of the screen printing form 1 and the largest cross-sectional width 8 of the uncoated recesses 4 and 5 is less than 1: 1.
    The screen printing form 1 with the first layer 2 as a screen printing template carrier and the second layer 3 as a screen printing template can be made in one piece. The two layers 2 and 3 are then only defined by the depth of the recesses 4 and 5, however, it is equally possible that the first layer 2 and second layer 3 are formed by two parts consisting of the same or different materials. The screen printing form 1 preferably consists of a sheet of stainless steel, from which the first and second layers are formed by chemical etching. However, it is also possible that only the screen printing template carrier is formed from a foil of stainless steel. In this embodiment, the template carrier consists of a film which has only the first recesses 4 and which is combined with a template layer which is formed from a photosensitive emulsion based on polyvinyl alcohol, from a capillary film or from a solid resist, or by means of a Gaivanization process where nickel is preferably used has been manufactured.
    In the second embodiment, shown in Figure 2, of the screen printing form 1 according to the invention, a substantially identical structure is present as in the first embodiment. In the recesses 4 and 5, which both have a cross-sectional inner width 8, there is a covering 61 with a width 12, wherein the covering 61 is arranged circumferentially in the recesses 4 and 5. However, a difference to the first embodiment is that the coating 61 has a contact angle to water in a range of 0 ° to 90 °. As a result, there is a relatively good interaction between the printing medium 30 and the surface of the coating 61, so that during removal of the screen printing form 1 from the substrate 20, see arrow 50, an applied printing medium 30 is only slightly detached from the coating. The result is a printing layer 31 on the substrate 20 which has only a relatively small height 13. With such a screen printing form 1, a narrow printing strip with a width 14 and a height 13 can thus be manufactured. The ratio between height and width of the printing strip is less than 1: 1, however, the absolute value of the width 14 is less than 60 micrometres smaller than the cross-sectional inner width 8 of the recesses 4 and 5 if they would be without a coating has been done.
    In the third embodiment of the screen printing form according to the invention shown in Figure 3, a leg 40 is provided within the first recess. Both the leg 40 and the walls of the first recess 4 and second recess 5 are provided with a covering 63. The printing medium 30 arranged in the recess 4 can press under the leg, so that a relatively wide printing layer 31 is possible. The covering 63 has a contact angle to water in a range of 0 to 90 °. After removing the screen printing form 1 from the substrate 20, see arrow 50, a relatively large part of the printing medium 30 remains in the first recess 4, so that a low printing layer 31 with a relatively uniform height profile over its width can be realized on the substrate 20. is,
    Figure 4 shows a fourth embodiment of the screen printing form according to the invention. The recesses 4 and 5 are provided with a covering 64 which has a contact angle with respect to water in a range of 90 ° to 150 °. After removing the screen printing form 1 from the substrate 20, see arrow 50, a relatively small part of the printing medium 30 remains in the first recess 4, so that a high printing layer 31 with a relatively uniform height profile over its width can be realized on the substrate 20. The dotted line 32 shows the height profile of the printing layer 31 immediately after removal from the mold, the solid line 33 indicating the height profile of the printing layer 31 after the printing medium 3u has flowed sideways. In this embodiment, it is possible to manufacture a printing layer 31 with a height to width ratio of 1: 1.
    权利要求:
    Claims (3)
    [1]
    What is claimed is: 1. A screen printing form having a first layer as a screen printing template carrier, wherein the first layer is provided with first recesses which are designed such that they extend from an upper side to the lower side of the first layer, a second layer is a screen printing template which is preferably a metal masking layer which is fixedly connected to the underside of the first layer, the second layer being provided with second recesses which coincide at least partially with the first recesses of the first layer such that a printing medium passes through the first recesses of the first layer layer from its top side through the second recesses of the second layer is transportable in the direction of the bottom side and on one side. Substantially suitable underneath, wherein the surfaces of the first and / or second recesses are provided with a coating having a thickness that is at least 5% of the smallest cross-sectional inner width of the respective recess.
    [2]
    A screen printing form according to claim 1, wherein the ratio between total height of the screen printing form and largest cross-sectional inner width of the first and / or second non-coated recess is less than 1: 1 and the ratio between total height of the screen printing form and largest inside cross-sectional width of the first and / or second coated recess greater than 1: 1.
    [3]
    A screen printing form according to claim 1 or 2, wherein the surfaces of the first and / or second recesses are provided with a coating that has a thickness of at least 20%; of the smallest cross-sectional width with respect to the respective recess, 4, the printing form according to one of the claims 1 to 3, wherein the coating contains a contact book with respect to Father in a range of 0 * to 93 *. A beef printing form according to any of claims 1 to 4, wherein; the covering contains a contact book with respect to satyr in an area greater than: 30 ° to 15Ci *
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    同族专利:
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    WO2010142274A2|2010-12-16|
    NL2004844C2|2011-06-09|
    DE102009024873A1|2010-12-16|
    WO2010142274A3|2013-03-21|
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    引用文献:
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    法律状态:
    2015-01-21| V1| Lapsed because of non-payment of the annual fee|Effective date: 20150101 |
    优先权:
    申请号 | 申请日 | 专利标题
    DE102009024873|2009-06-09|
    DE102009024873A|DE102009024873A1|2009-06-09|2009-06-09|Screen printing form has layer as screen printing stencil carrier, where layer is provided with recesses that are formed such that they reach from upper side to lower side of layer|
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