Method for stencil plate making of stencil sheet for stencil printing

Patent 6550380 Issued on April 22, 2003. Estimated Expiration Date:

October 2, 2021. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.

Abstract Claims Description Full Text

Patent References

Thermal plate making apparatus
Patent #: 5216951
Issued on: 06/08/1993
Inventor: Yokoyama, et al.

Thermal stencil plate making method Patent #: 5417156
Issued on: 05/23/1995
Inventor: Tateishi, et al.

Inventors

Assignee

Riso Kagaku Corporation

Application

No. 968664 filed on 10/02/2001

US Classes:

101/128.4, Manufacture101/128.21, Laminated and/or plural sheets and/or coated base and manufacture347/171, THERMAL MARKING APPARATUS OR PROCESSES347/188, Density control400/120.01, Thermal400/120.09Density control

Examiners

Primary: Evanisko, Leslie J.

Attorney, Agent or Firm

Nath; Gary M., Novick; Harold L., Berkowitz; Marvin C.

International Classes

B41C 001/14
B41J 002/32

Foreign Application Priority Data

2000-10-03 JP

Abstract

A micro porous plastic sheet is stencil plate made by a method for stencil plate making of a stencil sheet for stencil printing under the following conditions: heat is provided to form a negative image with TPH at -30ࣘTp-Tmࣘ300° C. (Tp is heating peak temperature and Tm is melting temperature (melting point) of the sheet) and in 10ࣘTo×100/Tsࣘ80% (To is current-carrying time period and Ts is current-carrying cycle), micro pores are closed by the pressure for stencil plate making of 0.1ࣘPࣘ1.0 MPa, and the thermal shrinkage rate of the sheet measured by TMA is set to 1ࣘSTm-30ࣘ20% (STm-30 is a thermal shrinking rate of the sheet at a temperature 30° C. lower than the melting point TM).