JP2007090634A - Manufacturing method of mesh fabric for screen plate and manufacturing method of screen plate - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a manufacturing method of a mesh fabric for a screen plate which enables easy attainment of the mesh fabric having small meshes and being thin and also enables lessening of a difference in the degrees of strength and extension between warp and weft in the mesh fabric, and a manufacturing method of the screen plate. <P>SOLUTION: In the case of manufacturing the mesh fabric constituting screen meshes for printing, a weaving machine and a reed are prepared and also metallic thin wires constituting the warp and the weft are provided. A plurality of pieces of the warp are each passed through the reed, and in a state of a pitch of arrangement of the weft being set by the weaving machine, a plurality of pieces of the weft are woven in so that they are at right angles to (intersect perpendicularly) the warp, so as to form a fabric intermediate. On the occasion, the weft is woven in to be more than the warp so that the pitch of arrangement of the weft is narrower than that of the warp. Successively the fabric intermediate is rolled so as to flatten the intersecting portions of the warp and the weft in the fabric intermediate. Thereby the mesh fabric is obtained. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a method for producing a mesh fabric for a screen plate used in a screen plate for performing screen printing, and a method for producing a screen plate.

The screen plate is used for printing an electrode pattern or the like when manufacturing an electronic component such as a multilayer chip capacitor. As a method for producing such a screen plate, for example, as described in Patent Document 1, a mesh fabric composed of a plurality of warp yarns and a plurality of weft yarns is joined to a plate frame with an adhesive. It has been.
JP 2001-171080 A

  In recent years, with the miniaturization and high integration of electronic components, there has been an increasing demand for thin electrode patterns. In order to print the electrode pattern thinly, it is necessary to reduce the mesh of the mesh fabric or make the mesh fabric itself thin. However, this is not considered at all in the above prior art.

  Further, in a general screen-plate mesh fabric as in the above prior art, the warp and weft yarns have different weaving states, so that the warp and weft yarns have different strength characteristics. In this case, when screen printing is performed using a screen plate, the weaker one of warp and weft yarns tends to stretch. Therefore, if the screen plate is used for a long time, the printed pattern will be deformed. As a result, the printing durability of the screen plate is lowered.

  An object of the present invention is to provide a mesh fabric for a screen plate and a screen capable of easily obtaining a thin mesh fabric with a small mesh and reducing the difference in strength between warp and weft in the mesh fabric. It is to provide a plate manufacturing method.

  The method for producing a mesh fabric for a screen plate according to the present invention includes a step of forming a fabric intermediate formed by weaving so that a plurality of metal warps and wefts intersect each other, and rolling the fabric intermediate to form a mesh fabric. And the step of forming the woven fabric intermediate is characterized in that a large amount of weft is woven into the warp so that the pitch of the weft is narrower than the pitch of the warp.

  In such a method for producing a mesh fabric for a screen plate, when forming a woven intermediate, a loom and a sheath (accessory of a loom) are used, and the position of the warp is adjusted by the weave and the weft is woven. Like that. At this time, by weaving many wefts with respect to the warp so that the arrangement pitch of the wefts becomes narrower than the arrangement pitch of the warps, the warp and wefts in the woven fabric intermediate can be obtained without changing the wire diameter of the warp and weft. As a result, the mesh formed is inevitably small. Thereby, the mesh of the mesh fabric finally obtained becomes small. Further, after forming the woven fabric intermediate, the mesh woven fabric itself is thinned by rolling the woven fabric intermediate to form a mesh woven fabric. Therefore, a mesh fabric with a small mesh and a thin mesh can be easily obtained.

  By the way, in the mesh fabric for screen plates, as described above, there is a difference in the strength and elongation between the warp and the weft due to the difference in the weaving state between the warp and the weft. Specifically, due to the difference in the weaving method between the warp and the weft as described above, the strength of the weft is usually higher than the strength of the warp before the woven intermediate is rolled. However, when the fabric intermediate is strongly rolled to form a mesh fabric sufficiently thinly, it is said that the warp yarn's strong elongation tends to be higher than that of the weft yarn. On the other hand, it has been clarified by the present inventors that the strength and elongation of the weft increases as the arrangement pitch of the weft decreases. In view of this, the weft of the weft intermediate in the fabric intermediate is previously increased by weaving more wefts into the warp so that the weft arrangement pitch is narrower than the warp arrangement pitch. In this state, by strongly rolling the fabric intermediate, even if the weft strength decreases and the warp strength increases, the weft strength becomes close to the warp strength as a result. It becomes like this. Thereby, the difference in strong elongation between the warp and the weft in the mesh fabric can be reduced while forming the mesh fabric sufficiently thin.

  Preferably, in the step of forming the woven fabric intermediate body, the weft yarn is woven into the warp yarn so that the weft yarn extends substantially straight and the warp yarn is alternately wavy with respect to the weft yarn. As described above, wefts are often woven into warp yarns. However, to adjust the weft arrangement pitch, it is only necessary to change the pitch setting of the loom, and the weft yarns are woven so as to extend almost straight. Therefore, weaving work of warp and weft can be performed relatively easily. In addition, after rolling the woven fabric intermediate body, the weft yarns are undulated and the warp yarn undulation amount is reduced, so that the waving state of the warp yarns and the weft yarns in the mesh fabric can be made uniform.

  Preferably, in the step of rolling the woven fabric intermediate, the woven fabric intermediate is rolled so that the strong elongation characteristics of the warp and the strong elongation characteristics of the weft are aligned. Thereby, in the mesh fabric finally obtained, the difference in strong elongation between the warp and the weft can be further reduced.

  The method for producing a screen plate according to the present invention includes a step of forming a woven fabric intermediate formed by weaving so that a plurality of warp and weft yarns made of metal intersect each other, and a step of forming a mesh woven fabric by rolling the woven intermediate. And a step of fixing the mesh fabric to the plate frame, and in the step of forming the fabric intermediate, wefts are woven in a larger amount with respect to the warp so that the weft pitch is narrower than the warp pitch. It is characterized by.

  In such a screen plate manufacturing method, the mesh fabric can be easily made smaller by using the mesh fabric manufacturing method described above, and the mesh fabric itself can be easily formed. Can be thinned. Moreover, the strong elongation difference between the warp and the weft in the mesh fabric can be reduced.

  According to the present invention, a mesh fabric having a small mesh and a thin mesh can be easily obtained. Thereby, when screen printing is performed, it is possible to thinly print an electrode pattern or the like. Moreover, the strong elongation difference between the warp and the weft in the mesh fabric can be reduced. As a result, deformation of the printed electrode pattern or the like can be suppressed and printing durability can be improved.

  DESCRIPTION OF EMBODIMENTS Hereinafter, preferred embodiments of a method for producing a mesh fabric for a screen plate and a method for producing a screen plate according to the present invention will be described in detail with reference to the drawings.

  FIG. 1 is a schematic plan view showing a screen plate manufactured by an embodiment of the method for manufacturing a screen plate according to the present invention, and FIG. 2 is a schematic cross-sectional view taken along the line II-II in FIG. In each figure, a screen plate 1 is used for printing an electrode pattern on a green sheet, for example, in a manufacturing process of a multilayer chip capacitor.

  The screen plate 1 includes a plate frame 2, a supporting screen mesh 3, and a printing screen mesh 4. The plate frame 2 is formed of a lightweight metal material such as aluminum or a light alloy.

  The supporting screen mesh 3 has a rectangular sheet shape. A rectangular opening 3 a is formed at the center of the supporting screen mesh 3. The supporting screen mesh 3 is fixed to the plate frame 2 with an adhesive 5 such as a polyester resin in a state where a predetermined tension is applied.

  The supporting screen mesh 3 is made of a synthetic resin material. Specifically, the supporting screen mesh 3 is a mesh woven of synthetic resin fibers such as polyester as warp and weft yarns, for example, about 250 mesh (# 250). Note that # 250 means that there are 250 pieces per inch. The supporting screen mesh 3 may be either a woven fabric or a non-woven fabric.

  The printing screen mesh 4 has a rectangular sheet shape. The printing screen mesh 4 is fixed to the supporting screen mesh 3 with an adhesive 6 such as polyester resin so as to cover the opening 3 a of the supporting screen mesh 3. A predetermined tension is applied to the printing screen mesh 4 through the supporting screen mesh 3.

  The printing screen mesh 4 is made of a metal material. Specifically, the supporting screen mesh 4 is a mesh in which fine wires made of stainless steel or a metal obtained by performing Ni plating on stainless steel are woven as warps and wefts, for example, about 500 to 600 mesh (# 500 to # 600) belongs to. The screen mesh 4 for printing may be either woven fabric or non-woven fabric.

  The printing screen mesh 4 includes a pattern forming region 4 a inside a portion bonded to the supporting screen mesh 3. In the pattern formation region 4a, there are a portion in which a mesh formed by warp and weft is closed with a closing agent such as an emulsion, and a portion not closed, thereby forming a predetermined printing pattern. Has been.

  When an electrode pattern is printed on a green sheet using such a screen plate 1, the printing screen mesh 4 of the screen plate 1 is opposed to the printing surface of the green sheet with a predetermined interval. Then, the conductive paste is supplied to the printing screen mesh 4 and the printing screen mesh 4 is brought into contact with the printing surface of the green sheet by sliding the squeegee on the printing screen mesh 4 to print the electrode pattern. To do.

  Next, a method for manufacturing the screen plate 1 described above will be described. First, a mesh fabric constituting the supporting screen mesh 3 and the printing screen mesh 4 is prepared. A procedure for producing a mesh fabric constituting the screen mesh 4 for printing is shown in FIG.

  In FIG. 3, first, a loom and a sheath (not shown) are prepared, and metal thin wires constituting warp (warp) and weft (weft) are prepared (step 51). OSA is an accessory for the loom and is a tool for adjusting the position of the warp and weaving the weft.

  Then, a plurality of warp yarns are passed through one by one, and the weft yarns are woven so as to be orthogonal to (intersect) the warp yarns with the weft pitch set by a loom. Thereby, the textile intermediate body 7 as shown in FIG. 4 is formed (step 52).

  Subsequently, so-called calendering, in which the fabric intermediate 7 is rolled so as to flatten the portion of the fabric intermediate 7 where the warp yarn 8 and the weft yarn 9 intersect, is performed. Thereby, the mesh fabric 10 as shown in FIG. 5 is formed (step 53).

  By the way, since the weft 9 is woven into the warp 8 as described above, the fabric intermediate 7 is formed in a state in which the wefts of the warp 8 and the weft 9 are different. For this reason, in the woven fabric intermediate body 7, the high elongation characteristic of the warp yarn 8 and the strong elongation characteristic of the weft yarn 9 are different.

  One of the methods showing the strength and elongation characteristics of warp and weft is a load-elongation diagram obtained by a tensile test specified in JIS L 1096-1990 (general fabric test method). . This tensile test is performed under the conditions that the strip width is 5 cm, the grip length is 20 cm, and the tensile speed is 10 cm / min. In the load-elongation diagram, as shown in FIG. 6, the vertical axis represents the load value and the horizontal axis represents the amount of elongation (strain).

  In the woven fabric intermediate before rolling, as is generally understood from FIG. 6 (a), the weft yarn strength elongation characteristics (see P in the figure) are better than the warp yarn strength elongation characteristics (see Q in the figure). It is said that there is. That is, in the state of the woven fabric intermediate before rolling, the weft is stronger than the warp because the weft is higher than the warp.

  However, when the woven fabric intermediate is rolled, the strong elongation of the weft yarn tends to be low and the strong elongation of the warp yarn tends to be high. At this time, the strong elongation of the warp and the weft varies depending on the rolling force applied to the fabric intermediate. In order to thinly print the electrode pattern on the green sheet, it is effective to form a thin mesh fabric. However, in order to form a mesh fabric thinly, it is necessary to roll the fabric intermediate with a sufficiently strong force. Therefore, in the state of the mesh fabric obtained by rolling, the strength of warp is higher than the strength of weft. It becomes easy to become. Thus, when the strong elongation difference between the warp and the weft is generated, only the weaker one of the warp and the weft becomes easier to stretch. For this reason, while the screen plate is used for a long time, the mesh fabric may be stretched during printing and may not return to its original state, leading to deterioration of the printing durability of the screen plate.

  On the other hand, it has been found that the narrower the weft yarn arrangement pitch, the greater the weft elongation. Moreover, as the arrangement pitch of the weft yarns is narrowed, the mesh (opening) of the woven fabric intermediate is necessarily reduced. Thus, it is possible to thinly print the electrode pattern on the green sheet also by reducing the mesh of the fabric intermediate. At this time, the mesh size of the fabric intermediate can be easily adjusted by changing the arrangement pitch of the weft yarns without changing the diameter of the metal wires constituting the warp yarn and the weft yarn.

Therefore, in the step of forming the woven fabric intermediate 7 (step 52 in FIG. 3), as shown in FIG. 4, the warp yarns 8 are arranged so that the arrangement pitch of the weft yarns 9 is narrower than the arrangement pitch of the warp yarns 8. A large number of wefts 9 are woven per unit length. Thereby, the strong elongation of the weft 9 in the fabric intermediate body 7 is increased. That is, as described above, the strength / elongation characteristic when the arrangement pitch of the weft yarns 9 is narrower than the arrangement pitch of the warp yarns 8 (see the solid line P in FIG. 6A) is the same as the arrangement pitch of the weft yarns 9 and the warp yarns 8. than strength and elongation properties of the case of the equal pitch (see a chain line P ₀ 1 point in FIG. 6 (a)) becomes good.

  Further, when the warp yarn 8 and the weft yarn 9 are woven, as shown in FIG. 4, the warp yarn 8 is alternately waved with respect to the weft yarn 9 while the weft yarn 9 is stretched so as to extend almost straight. The weft yarn 9 is knitted into the warp yarn 8. Since the arrangement pitch of the weft yarns 9 can be adjusted only by changing the setting of the loom, it does not take much time for the operator. Further, by weaving the weft yarn 9 in a state of being stretched almost straight, the weaving operation of the warp yarn 8 and the weft yarn 9 can be performed relatively easily.

Thereafter, in the step of rolling the fabric intermediate body 7 (step 53 in FIG. 3), the fabric intermediate body 7 is rolled with a sufficiently strong force to obtain the thin mesh fabric 10. When the woven fabric intermediate 7 is rolled, as described above, the high elongation of the weft 9 tends to be low and the high elongation of the warp 8 tends to be high (see the arrow in FIG. 6A). However, in the woven fabric intermediate 7, the weft yarn 9 is forcibly increased in advance by a predetermined amount by making the weft yarn 9 arrangement pitch narrower than the warp yarn 8 arrangement pitch (FIG. 6A). Middle P ₀ → P). For this reason, even if the fabric intermediate body 7 is rolled sufficiently strongly, the strength and elongation of the warp 8 are not higher than the strength of the weft 9, and the strength and elongation of the warp 8 approach the strength of the weft 9. It becomes like this. At this time, as shown in FIG. 6 (b), in the mesh fabric 10, the fabric intermediate body 7 is rolled with an optimum strength so that the strength and elongation characteristics of the warp yarn 8 and the strength and elongation properties of the weft yarn 9 are substantially aligned. It is preferable to do this.

  By rolling the fabric intermediate body 7 in this manner, a mesh fabric 10 in which the pitch of the weft yarn 9 is narrower than the pitch of the warp yarn 8 is obtained as shown in FIG. Further, the rolling of the woven fabric intermediate body 7 causes the weft yarn 9 that extends substantially straight to wavy, and the degree of waviness of the warp yarn 8 decreases. Thereby, as shown in FIG. 5, the wavy state of the warp yarn 8 and the weft yarn 9 in the mesh fabric 10 becomes uniform.

  When the mesh fabric constituting the supporting screen mesh 3 is manufactured, the loom and the sheath (not shown) are used to form the synthetic resin fiber in the same manner as the method for manufacturing the mesh fabric 10 described above. A woven fabric intermediate body is formed by weaving so that a plurality of warp yarns and weft yarns are orthogonally crossed. And the mesh fabric is obtained by rolling the fabric intermediate. Since the mesh fabric constituting the supporting screen mesh 3 is not directly related to the printing of the electrode pattern, the arrangement pitch of the warp and weft may be equal or different.

  After producing the mesh fabric constituting the supporting screen mesh 3 and the printing screen mesh 4, the mesh fabric 10 constituting the printing screen mesh 4 is pulled by a clamp (not shown), and a predetermined tension is applied to the mesh fabric 10. Give. Then, the mesh fabric 10 is cut into a predetermined shape. Thereby, the printing screen mesh 4 is obtained.

  Further, the mesh fabric 11 (see FIG. 7) constituting the supporting screen mesh 3 is pulled by a clamp, and a predetermined tension is applied to the mesh fabric 11. In this state, as shown in FIG. 7, the mesh fabric 11 is attached to the frame plate 2 placed on a base plate (not shown) with an adhesive 5.

  Subsequently, as shown in FIG. 8, the screen mesh 4 for printing is attached to the mesh fabric 11 with the adhesive 6. At this time, the entire peripheral edge of the printing screen mesh 4 is bonded to the mesh fabric 11.

  Subsequently, as shown in FIG. 9, after removing the inner portion of the adhesive 6 in the mesh fabric 11, the outer portion of the frame plate 2 in the mesh fabric 11 is cut along the frame plate 2. Thereby, the supporting screen mesh 3 fixed to the frame plate 2 is formed, and the above-described screen plate 1 is completed.

  As described above, according to the present embodiment, after forming the woven fabric intermediate body 7 by weaving many wefts 9 into the warp yarns 8 so that the arrangement pitch of the weft yarns 9 is narrower than the arrangement pitch of the warp yarns 8, By rolling this fabric intermediate body 7, a mesh fabric 10 constituting the printing screen mesh 4 is formed. Thereby, the printing screen mesh 4 having a small mesh size and a small thickness can be easily formed. As a result, it is possible to print the electrode pattern on the green sheet sufficiently thinly. In addition, the printing screen mesh 4 having a permeation volume comparable to that of a high-density mesh product can be made at low cost and with high productivity.

  At this time, the permeation volume of the printing screen mesh 4 can be finely adjusted by changing the arrangement pitch of the wefts 9. Specifically, when the arrangement pitch of the weft yarns 9 is increased, the transmission volume of the printing screen mesh 4 is increased, and when the arrangement pitch of the weft yarns 9 is reduced, the transmission volume of the printing screen mesh 4 is decreased. In general, when the permeation volume of the mesh is reduced, the number of warps and wefts is increased. However, since it is difficult to pass the warp, it is very expensive in terms of the manufacturing method. According to the present embodiment, it is possible to cope with the problem by simply adjusting the arrangement pitch of the weft yarns 9, so that the transmission volume of the printing screen mesh 4 can be easily reduced, and the manufacturing method is inexpensive. Become.

  In addition, as described above, the difference in strength between the warp yarn 8 and the weft yarn 9 in the printing screen mesh 4 can be reduced. As a result, the warp yarns 8 and the weft yarns 9 have the same degree of elongation, so that while the screen plate 1 is used for a long time, the problem that the printing screen mesh 4 is stretched during printing and cannot be restored is prevented. . For this reason, since the deformation of the shape and dimensions of the electrode pattern printed on the green sheet can be suppressed, the printing durability of the screen plate 1 can be improved.

  The present invention is not limited to the above embodiment. For example, the screen plate 1 according to the above embodiment includes the supporting screen mesh 3 and the printing screen mesh 4, but the present invention is a screen plate without the supporting screen mesh, that is, for printing on a frame plate. The present invention can also be applied to a method for manufacturing a screen plate to which a screen mesh is attached.

  Moreover, although the said embodiment prints an electrode pattern in the manufacturing process of a multilayer chip capacitor, this invention is not limited to the screen plate used for the electrode printing of other electronic components, but various screen plates. Applicable to manufacturing method. However, the present invention is useful in the case of a chip capacitor manufacturing method, particularly when it has a mesh fabric of 500 mesh or more.

It is a schematic plan view which shows the screen plate manufactured by one Embodiment of the manufacturing method of the screen plate concerning this invention. FIG. 2 is a schematic cross-sectional view taken along the line II-II in FIG. 1. It is a flowchart which shows the procedure which manufactures the mesh fabric which comprises the screen mesh for printing shown in FIG.1 and FIG.2. It is a perspective view which shows the textile intermediate body formed by the procedure shown in FIG. It is a perspective view which shows the mesh fabric formed by the procedure shown in FIG. FIG. 6 is a load-elongation diagram showing an example of the strength and elongation characteristics of warp and weft in the intermediate fabric shown in FIG. 4 and an example of the strength and elongation characteristics of warp and weft in the mesh fabric shown in FIG. 5. It is a cross-sectional schematic diagram which shows the manufacturing process of the screen plate shown in FIG.1 and FIG.2. It is a cross-sectional schematic diagram which shows the manufacturing process of the screen plate shown in FIG.1 and FIG.2. It is a cross-sectional schematic diagram which shows the manufacturing process of the screen plate shown in FIG.1 and FIG.2.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Screen plate, 2 ... Frame plate, 4 ... Screen mesh for printing, 7 ... Textile intermediate body, 8 ... Warp, 9 ... Weft, 10 ... Mesh fabric.

Claims (4)

Forming a woven intermediate formed by weaving so that a plurality of warps and wefts made of metal intersect each other;
Rolling the fabric intermediate to form a mesh fabric,
In the step of forming the woven fabric intermediate, a large amount of the weft yarn is woven into the warp yarn so that the weft yarn arrangement pitch is narrower than the warp yarn arrangement pitch. Production method.   In the step of forming the woven fabric intermediate, the weft yarn is woven into the warp yarn so that the weft yarn extends substantially straight and the warp yarn is alternately wavy with respect to the weft yarn. The method for producing a mesh fabric for a screen plate according to claim 1.   The step of rolling the woven fabric intermediate is characterized in that the woven fabric intermediate is rolled so that the strong elongation properties of the warp yarns and the strong elongation properties of the weft yarns are aligned. Manufacturing method of mesh fabric for screen plate. Forming a woven intermediate formed by weaving so that a plurality of warps and wefts made of metal intersect each other;
Rolling the fabric intermediate to form a mesh fabric;
Fixing the mesh fabric to a plate frame,
In the step of forming the woven fabric intermediate, a method for producing a screen plate, wherein a large amount of the weft yarn is woven into the warp yarn so that the arrangement pitch of the weft yarn is narrower than the arrangement pitch of the warp yarn.

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