Parting Line Steel Preload Calculation for Multi Cavity Injection Moulds
Calculate multi cavity parting line preload by balancing machine clamp force against internal hydraulic separation force to maintain positive shut-off land sealing stress.
Tactile Pressure Film
Meaning
Sensitive indicator materials consist of a thin polyester base coated with microcapsules that burst under mechanical load. Using tactile pressure film allows technicians to see the distribution of force across the parting line of a mould. The color intensity of the film changes according to the amount of pressure applied, creating a visual map of the contact areas.
It is an effective tool for identifying uneven clamping or plate flexure.
Load Mapping
Placing the film between the mould halves and closing the press shows exactly where the steel is making contact. Tactile pressure film reveals high spots that could lead to hobbing or low spots that will cause flash. This data is more precise than traditional methods like using a felt tip marker or dye.
Interface Uniformity
Achieving a balanced load across the tool ensures that the part quality remains consistent throughout the run. When tactile pressure film shows a pale color in one corner, it indicates that the mould is not closing evenly. This misalignment can be caused by worn leader pins or a warped machine platen.
Visual Calibration
Comparing the developed film against a color chart provides an estimate of the pressure in megapascals. While not as exact as a digital sensor, tactile pressure film offers a fast and portable way to troubleshoot tooling issues. This verification is often required as part of a formal tool validation process.