Dewatering Fabric Perforated Plastic Watermark Insert
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Solution Overview
Problem
Existing drainage wires for producing paper with watermarks often result in unwanted image artifacts due to connecting webs between linear partial elements, which are visible in the finished paper, especially when producing two-stage watermarks with high pressure loads.
Innovation Solution
A drainage wire with a perforated plastic watermark insert comprising a base body and spaced linear or punctiform motif elements that extend from the base body and are unconnected above the screen surface, ensuring high stability and avoiding visible connecting elements in the finished watermark.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If connecting webs are used to stabilize linear partial elements under high pressure loads, then the stability of the watermark is improved, but visible image artifacts appear in the finished paper
Solution Approach 1:
The harmful connecting webs are completely removed from the watermark design. The patent achieves this by using a single-piece electertype where the linear partial elements are formed as integral parts of the base body, eliminating the need for separate connecting structures that would create visible artifacts in the finished paper.
Solution Approach 2:
The linear partial elements are merged with the base body to form a single-piece electertype structure. This integration allows the elements to be stabilized as part of the unified structure rather than requiring separate connecting webs, thus avoiding visible artifacts while maintaining stability under pressure loads.
2Manufacturing precision
If electrotypes are soldered onto the screen structure to close the dewatering screen, then the watermark effect is improved, but the complexity of manufacturing increases
Solution Approach 1:
The electertype is designed as a single-piece structure where the base body and linear partial elements are formed integrally. This merging of components eliminates the need for separate soldering operations to attach electrotypes to the screen structure, simplifying manufacturing while maintaining the watermark effect.
Solution Approach 2:
The linear partial elements are pre-formed as integral parts of the base body during electertype fabrication. This preliminary formation of the complete structure before installation on the screen eliminates subsequent assembly steps and reduces manufacturing complexity.
3Manufacturing precision
If the linear partial elements are made thin to improve watermark detail, then the visual appearance is improved, but the stability under high pressure loads deteriorates
Solution Approach 1:
The thin linear partial elements are merged with the base body to form a single-piece structure. This integration provides structural support from the base body that stabilizes the thin elements under high pressure loads, allowing fine detail to be maintained without sacrificing stability.
Solution Approach 2:
The linear partial elements are pre-formed with optimal thickness and geometry during electertype fabrication, allowing precise control of their dimensions for fine detail while the subsequent integration with the base body provides the necessary structural support for stability under pressure.
Data Source
Figure 1~2
Figure 3a~3b
Figure 4
AI summary
The invention relates to a dewatering screen (40) for the production of paper with a watermark (12, 14), wherein, according to the invention, the watermark (12, 14) is predefined in the form of a dot and line motif. The dewatering screen (40) has a carrier screen (42) with a screen surface (52) on which paper is deposited, and a perforated plastic watermark insert (54) arranged in a partial area of the carrier screen (42).The plastic watermark insert (54) comprises a base body (56) and at least two spaced-apart line- or dot-shaped motif elements (60-1, 60-2, 60-3), wherein the base body (56) is arranged in or below the screen surface (52) of the carrier screen (42), and the at least two spaced-apart line- or dot-shaped motif elements (60-1, 60-2, 60-3) extend from the base body (56) to above the screen surface (52) to form the specified dot and line motif and are unconnected above the screen surface (52).