【New Project】Physical Course-Prevention and Solution of PC Molding Appearance and Structure Problems
2023-02-22
【New Project】Physical Course-Prevention and Solution of PC Molding Appearance and Structure Problems
Date and time: 2023/2/22 13:30 ~ 2023/2/22 16:30
Total Hours: 3 hours
Technical topics: PC, raw material characteristics, molding principle, molding attention links, molding problems and case analysis, systematization, molding appearance, structural problems.
Basic overview of PC
- The relationship between the molecular chain composition of PC and material properties
- Polyester polar materials
- Common PC types: general, flame retardant, halogen-free flame retardant, high transparency (RF), diffusion grade, high toughness, high rigidity, high flow, low temperature resistance, high impact resistance, chemical resistance, UV resistance and high weather resistance
- Release and influence of bisphenol A/BPA
- Comparison of PC, transparent ABS, PMMA, PETG, PES, PA12, transparent PP
- Alloy plastic
The basic principle of injection molding
- PC viscosity characteristics of non-Newtonian fluids
- Flow core layer, shear layer, cured skin layer
- Basic characteristics of plastic flow
Five points of attention for PC molding techniques
- Precautions for product design: flow length ratio, difference in meat thickness, transparent parts
- Molding characteristics of plastic raw materials: flame resistance, influence of additives, addition of secondary materials, material temperature
- Inspection focus of mold structure: template structure strength, exhaust, gate type
- Matching and selection of machinery and equipment: the difference between the PC special material pipe and the general material pipe, and the drying conditions
- Basic setting of molding parameters: influence of molding curve, injection pressure and injection speed, pressure holding, and mold temperature
Common problems and case analysis of PC molding
- The parameter adjustment of burrs and shrinkage and the influence of the mold
- The problem of molding internal stress
- Formation of vacuum bubbles
- Black spots, black lines, and different colors caused by the material pipe
- The rate of fire causes traces at the gate
- Defects in post-processing: painting, printing, electroplating, thermal transfer printing, UV printing
