Preventing Factory Retention Claims over Customer Owned Injection Moulds
Preventing factory retention over customer injection moulds demands PRC fapiao tax invoices, steel asset stamping, and pre-suit court preservation clauses.
Off-Tool T1 Sample Qualification
Meaning
First-stage part evaluation protocols inspect initial plastic components produced directly from new injection molds during initial trial runs. Engineers execute off-tool T1 sample qualification to identify tool steel errors before approving mold polishing and hardening. The evaluation protocol stops applying when samples exhibit structural or dimensional defects requiring major core and cavity steel modification.
Verification Procedure
Technical teams measure sample dimensions, evaluate surface sink marks, and test structural integrity using precision laboratory equipment. Samples molded without secondary finishing highlight inherent tool imperfections, uneven cooling channels, or incorrect gate locations. Engineers document geometric deviations against original CAD models to generate precise tool modification lists for the mold maker.
Rectifying steel errors at this early stage prevents expensive scrap production during subsequent high-volume manufacturing phases.
Technical Standard
Component dimensions must fit within specified tolerance envelopes set by engineering technical drawings. Quality technicians inspect sample wall thickness, warp tendencies, and surface textures to ensure mechanical drawing compliance.
Production Release
Formal approval of initial samples triggers authorized payment milestones and permits toolmakers to proceed with surface texturing. Under off-tool T1 sample qualification, failing part submissions halt tool progression until revised samples meet technical parameters. Signed qualification certificates form necessary contractual proof for subsequent tool shipment authorization.