Injection Mould Bailment Agreement Core Mechanics and Asset Protection Fundamentals
A mould bailment agreement secures unencumbered tool title, blocks statutory processor liens via UCC-1 filings, and mandates physical asset plaque tracking.
Parting Line Coining
Meaning
Intentional compression of the steel surfaces where two halves of a mould meet creates a tighter seal to prevent resin leakage. This parting line coining involves machining a small land area around the cavity that is slightly higher than the rest of the mould face.
Flash Prevention
Eliminating the space between the mould halves stops molten plastic from escaping the cavity.
Tooling Wear
Excessive pressure on the narrow coining land can lead to the deformation or peening of the steel over thousands of cycles. Regular inspection of the parting line coining area is necessary to ensure the land has not collapsed or become rounded. If the steel deforms, the seal is lost and flash will begin to appear on the parts.
Pressure Distribution
Calculating the total surface area of the coining land is necessary to avoid exceeding the yield strength of the mould steel. Effective parting line coining requires a balance between the tonnage of the injection press and the hardness of the tool material. If the area is too small, the steel will crush, while an area too large will not provide enough sealing pressure.
Constant monitoring of part weights can reveal when the coining land has started to collapse.