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Method of dry preparation of relief printing plates

阅读：798发布：2024-02-09

专利汇可以提供Method of dry preparation of relief printing plates专利检索，专利查询，专利分析的服务。并且An improved method for preparing relief printing plates by transfer of selected portions of a dry, uncured, heat-sensitive polymer dispersion layer from a donor sheet to a printing plate through fusion under infrared radiation. Infrared-absorbing indicia are deposited on a printing plate base having an affinity for fusion with the polymer dispersion under infrared heat. The printing plate base having indicia thereon is placed in intimate physical contact with the polymer dispersion layer of the donor sheet. By application of infrared energy, portions of the polymer dispersion layer are polymerized and hardened in the desired image and fused to the printing plate base to and through the indicia. The donor sheet with the unfused portions of the polymer dispersion, peels away easily leaving a finished printing plate with the indicia incorporated therein.，下面是Method of dry preparation of relief printing plates专利的具体信息内容。

权利要求

2. The method of claim 1 wherein the step of depositing indicia is achieved by pressure through a medium containing said infrared-absorbent material directly to the printing plate base.

3. The method of claim 1 wherein the step of depositing indicia is achieved by pressure through a medium containing said infrared-absorbent material onto a transfer sheet, assembling said transfer sheet and said printing plate base with said indicia in intimate contact with said printing plate base, exposing said assembled sheet and printing plate base to infrared radiation and peeling off said transfer sheet to leave an effective portion of said infrared-absorbing indicia on said printing plate base.

4. In the process of preparing a relief printing plate by polymerizing selected portions of a sheet of heat-sensitive polymer dispersion material and fusing said portions to a printing plate base by application of near-infrared radiation, the steps of: depositing near-infrared-absorbent indicia on said printing plate base, assembling said polymer dispersion sheet in intimate contact with said indicia, and fusing portions of said polymer dispersion sheet in the image of said indicia and bonding said polymerized portions to said printing plate base, incorporating said infrared-absorbent indicia between said polymerized portions and said printing plate base.

5. A method for the preparation of relief printing plates comprising: a. providing a donor sheet having a dry, uncured, polymer dispersion layer on a Smooth subcoated substrate to which said dispersion layer adheres but does not fuse at its curing temperature, said polymer dispersion layer including a mixture of a finely divided polymeric material and a plasticizer for said polymeric material; b. depositing infrared-absorbing indicia on a printing plate base to which said indicia will adhere, said indicia being composed of material to which said polymer dispersion will fuse under normal curing temperatures; c. assembling said printing plate base and said donor sheet with said indicia in intimate contact with said polymer dispersion layer; d. fusing selected portions of said polymer dispersion layer in the image of said indicia and bonding said portions to said printing plate base to and through said indicia by infrared radiation; and e. peeling said donor sheet with the uncured polymer dispersion adhering thereto off said printing plate base to leave a finished relief printing plate incorporating said indicia.

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Method of dry preparation of relief printing plates

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