INDUSTRY|iron, steel and other metal industries
- cúrphatrún Tagairt Doiciméad inmheánach de chuid an Choimisiuin: ENV-2024-00939 (conclúidí maidir le TIFAFanna le haghaidh ceártaí gaibhneachta agus teilgcheártaí)
- ga
- Sainmhíniú "patrún a dhéantar as polaistiréin bhorrtha (EPS) i bhfoirm cúir nó as meataicrioláit pholaimeitile (PMMA) i bhfoirm cúir" Tagairt Téarmeolaithe COM-GA; arna bhunú ar COM-Comhordú Téarmeolaíochta, agus ar: Doiciméad inmheánach de chuid an Choimisiuin: ENV-2024-00939 (conclúidí maidir le TIFAFanna le haghaidh ceártaí gaibhneachta agus teilgcheártaí)
- foam pattern
- en
- Sainmhíniú "pattern made from foamed expanded polystyrene (EPS) or foamed poly(methyl methacrylate) (PMMA)" Tagairt "COM-Terminology Coordination, based on: 'Final Draft of the Best Available Techniques (BAT) Reference Document for the Smitheries and Foundries Industry' (21.8.2024), European Commission, 2024, JRC."
- Nóta For small volume runs the pattern can be hand cut or machined from a solid block of foam, or a sheet of foam core board if the geometry is simple enough it can even be cut using a hot-wire foam cutter. If the volume is large, then the pattern can be mass-produced by a process similar to injection molding. Pre-expanded beads of polystyrene are injected into a preheated aluminum mold at low pressure. Steam is then applied to the polystyrene which causes it to expand more to fill the die. The final pattern is approximately 97.5% air and 2.5% polystyrene. Pre-made pouring basins, runners, and risers can be hot glued to the pattern to finish it.