Preventing Parting Line Compressive Yield and Flash in Multi Cavity Tooling
Prevent parting line flash by engineering shut-off lands to maintain compressive stress below 70 percent of steel yield strength under full clamp force.
Fuji Pressure Film
Meaning
Tactile pressure-indicating film changes color when subjected to compressive forces, allowing processors to map the force distribution between mating surfaces. This fuji pressure film contains micro-encapsulated color-forming material that ruptures at specific contact pressures. The density of the resulting red hue corresponds directly to the localized pressure level.
Colorimetric Indication
Micro-capsules of varying sizes break sequentially as the applied compressive force increases. A developer layer absorbs the released dye, generating a permanent red pattern that can be analyzed visually or with a digital scanner. This mechanical reaction provides a high-resolution map of static pressure.
Mold Alignment
Parallelism between mold halves can be verified by placing the material between the parting lines before clamping. Unsymmetrical patterns indicate a misalignment or deflection of the platen, which can lead to flash or part dimension variations. Corrective adjustments to the tie bars or mold seating can then be made based on these visual findings, reducing setup times and preventing uneven tool wear during long-term production runs.
Clamping Distribution
Even distribution of force across the mold faces prevents local venting issues and flash formation. When the film reveals uneven loading, it exposes high-pressure points that can wear out the mold prematurely. Uneven clamping patterns expose high-pressure points that can wear out the mold prematurely, making regular balanced clamping necessary to prolong tool life.