Pretreatment apparatus, pretreatment method, manufacturing method, and aqueous solution

The sequential application of alginate, chelating agent, and polyvalent metal salt solutions on a permeable medium addresses gelation issues, preventing bleeding and reducing traces, thereby enhancing image quality.

JP7711377B2Active Publication Date: 2025-07-23BROTHER KOGYO KK
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Patent Information

Application Number
JP2020219238
Authority / Receiving Office
JP · JP
Patent Type
Patents
Current Assignee / Owner
Filing Date
2020-12-28
Publication Date
2025-07-23
Estimated Expiration
2040-12-28

AI Technical Summary

Technical Problem

The use of an aqueous solution containing alginate as a pretreatment agent can lead to gelation with calcium ions from the ink, resulting in bleeding and traces outside the printing range.

Method used

A pretreatment apparatus and method involving sequential application of an alginate solution, a chelating agent solution, and a polyvalent metal salt solution on a permeable recording medium, with the chelating agent preventing gelation by binding to calcium ions.

Benefits of technology

Prevents bleeding and reduces gelation traces by using a chelating agent to control the reaction between alginate and calcium ions, ensuring uniform application and improved image quality.

✦ Generated by Eureka AI based on patent content.

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Patent Text Reader

Abstract

To provide a pretreatment apparatus that can prevent a pretreatment agent from oozing and reduce leftovers generated by a reaction between pretreatment agents in pretreatment.SOLUTION: A pretreatment apparatus of the present invention is an apparatus for pretreating an osmotic record medium to be coated with ink. The pretreatment apparatus includes a first coating part where the record medium is coated with an aqueous solution containing an alginate, a second coating part where the record medium is coated with an aqueous solution containing a chelate agent, and a third coating part where the record medium is coated with a pretreatment agent containing a polyvalent metal salt. In the third coating part, the record medium is coated with the pretreatment agent after coated in the first coating part and the second coating part.SELECTED DRAWING: Figure 1
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Citation Information

Patent Citations

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