Perforated Draw Down Paint Sample Card
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Solution Overview
Problem
Existing methods for preparing paint samples, such as finger smears and draw down sample cards, are messy and often result in uneven samples, which can lead to miscalculations during spectrophotometric analysis and interfere with visual color matching due to unpainted margins.
Innovation Solution
The use of draw down sample cards with perforated lines allows for the creation of uniform paint samples by preventing paint from running over the edges, enabling easy removal of unpainted margins and resulting in professional-looking, uniformly sized samples.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a draw down sample card is prepared by applying a puddle of paint and sliding a bar through the paint to spread it down the sheet, then the sample achieves uniform thickness adequate for analysis, but paint runs over the edges of the sheet creating mess
Solution Approach 1:
The patent introduces a draw down card as an intermediary substrate between the paint and the final sample. The card includes a painted area defined by borders that contain the paint during application, preventing it from running over edges. The card acts as a mediator that controls paint flow and defines the sample boundaries.
Solution Approach 2:
The draw down card is segmented into distinct functional areas: a painted area bordered by containment borders, and an unpainted margin area surrounding it. This segmentation allows the paint to be confined to specific regions while maintaining overall sample integrity and preventing edge runoff.
2Object-generated harmful factors
If less paint is used to prevent run over on edges, then mess is reduced, but a gap or unpainted margin appears at the edge of the sheet
Solution Approach 1:
The draw down card is segmented into a painted area and an unpainted margin area. The unpainted margin is intentionally designed as a functional element rather than a defect, serving as a border that defines the sample boundaries and provides space for handling without interfering with the painted sample area.
Solution Approach 2:
Different areas of the draw down card have different functional qualities: the painted area contains the uniform paint sample for analysis, while the unpainted margin area provides structural boundaries and handling space. Each area is optimized for its specific function.
3Ease of operation
If the unpainted margin around the edge of the sample is removed by cutting with scissors, then visual matching and comparison is improved, but the process becomes time consuming and samples have irregular edges
Solution Approach 1:
The draw down card is pre-designed with the unpainted margin area and border definitions before paint application. The borders and margins are预先 established as part of the card structure, eliminating the need for post-painting cutting operations. The sample is ready for visual matching immediately after painting.
Solution Approach 2:
The draw down card structure itself provides the boundary definition and margin management functions that would otherwise require manual cutting. The card's built-in borders and margin areas automatically create the necessary visual boundaries without additional processing steps.
4Productivity
If finger smear method is used to prepare fresh paint sample, then preparation is quick and simple, but the sample is uneven and messy leading to miscalculation by spectrophotometer
Solution Approach 1:
The draw down card serves as an intermediary tool that mediates between the simple finger smear action and the desired uniform sample result. The card's surface and borders guide the paint application to produce uniform thickness while maintaining quick preparation.
Solution Approach 2:
The draw down card controls the parameters of paint application by providing a defined surface area and borders that constrain paint flow. This transforms the uncontrolled finger smear into a controlled deposition process that maintains speed while improving uniformity.
Data Source
AI summary
Draw down paint sample cards, methods of making draw down paint sample cards from fresh paint using draw down paint sample cards, and systems including draw down paint sample cards and draw down bars sized for use with the draw down paint sample cards. The draw down paint sample cards may include a first side perforated line adjacent to a first side edge, a second side perforated line adjacent to a second side edge, a bottom perforated line adjacent to a bottom edge, and optionally a top perforated line adjacent to a top edge. After application of a fresh paint sample to the draw down card using a draw down bar, the perforated lines allow one or more of the unpainted edges of the draw down paint sample card to be removed to create a final paint sample card with paint extending to one or more of the edges.