Stock material or miscellaneous articles – Structurally defined web or sheet – Discontinuous or differential coating – impregnation or bond
Patent
1988-12-19
1990-09-25
Bell, James J.
Stock material or miscellaneous articles
Structurally defined web or sheet
Discontinuous or differential coating, impregnation or bond
428225, 428230, 428257, 428373, B32B 700
Patent
active
049592602
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a mesh fabric useful for a printing screen which consists essentially of conjugate filaments.
BACKGROUND OF THE INVENTION
In the past, as fabrics for printing screens, silk or stainless-steel mesh fabrics have been broadly used. However, the silk mesh fabrics were deficient in the strength and the dimensional stability for a printing screen. As regards the stainless steel mesh fabrics, severe problems were found in the elastic recovery and the instantaneous repelling force when a squeegee was applied. Further, silk and stainless are expensive.
Recently, for the above reasons, polyester or nylon mesh fabrics have been more used for printing screens. Particularly, the polyester mesh fabrics have been more preferred from the viewpoint of the high dimensional stability. However, the polyester mesh fabrics have the following disadvantages: many troubles. and several overlap coatings are required. printing durability is low.
In attempt to solve the above problems, various ways utilizing chemical treatment with acids or alkalies or the like, flame treatment, corona-discharge treatment, and so forth have been examined. However, various troubles such as reduction in the strength of the material and so forth have arised. The test results of the screens prepared in such ways have been unsatisfactory for practical application.
On the other hand, with diversification in the printing fields, high printing precision and high printing durability have been more required. Particularly, it is needed to develop a screen which has a high dimensional stability comparable to that of a stainless-steel screen, a high adhesion to an emulsion resin comparable to that of a nylon screen, and a high elastic recover property comparable to that of a polyester screen.
Japanese Laid-Open Patent Publication No. 142,688 of 1984 discloses an anti-static mesh fabric made from conjugate filaments. The anti-static mesh fabric is characteristic in that it is made from a theremoplastic synthetic polymer added with electro-conductive carbon black. An object of that lies in an improvement in the antistatic property of a screen mesh fabric. However, there is not taught any way for improvement of printing precision and printing durability which have been much desired as described above.
Accordingly, an object of this invention is to provide a mesh fabric useful for a printing screen having high dimensional stability, adhesion to an emulsion resin and elastic recovery property, that is, having high printing precision and printing durability.
DISCLOSURE OF THE INVENTION
In accordance with the invention, the mesh fabric consists essentially of conjugate filaments each composed of a sheath and a core. The material of the sheath has a high adhesive property to an emulsion and a resin of the screen, and the material of the core has a high dimensional stability and an elastic recovery property. The mesh fabric has a breaking elongation X (%) of from 15 to 40% and a breaking strength Y (kg.multidot.f) of not less than 25 kgf by the labelled strip measurement method at the specimen width of 5 cm and the grip interval of 20 cm, said breaking elongation X (%) and said breaking strength Y (kg.multidot.f) satisfying following formula: Y.gtoreq.(X+1).times.5/3, in the range of the elongation of not less than 5%.
The desired end of this invention can be achieved by using different synthetic fibre materials as a conjugate filament to act usefully whereby the composite filament can be provided only the good properties of each materials.
As the material of the core, polyesters, polyolefins or the like having a high dimensional stability and an elastic recovery property are used to afford screens having high dimensional stability. As the material of the sheath, polyamides, low viscosity type polyesters or the like having a high adhesive property to resins are used to present generating white-powdery scum as often found during the weaving of conventional polyester screens and to afford screens having high strength a
REFERENCES:
patent: 4824717 (1989-04-01), Nakanishi et al.
Kato Yoshinori
Omote Takuo
Tango Chobe
Tomoyasu Haruo
Bell James J.
Kanebo Ltd.
Nihon Tokushu Orimono Co., Ltd.
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