Moulage et surmoulage
Progress Silicones is an expert company in all molding and demoulding processes as well as in the treatment of LSR.
The whole molding process comes from an imprint with its own shape and into which liquid silicone will be injected so that the desired part can, therefore, be made in X copies. Overmolding is an injection molding consisting of adding an additional layer of liquid silicone, which will refine the rendering of the part giving it a unique look.
Gum injection molding
The basis of this technique is silicone gum. The injection gun containing this material is put to the test of the press and will distribute all its container in the cavities of the mold.
It is then necessary to let the time of curing pass and then remove the silicone from the mold to obtain the final rendering of your part.
Gum compression molding
In this process, the liquid silicone will be arranged in a mold with two open pieces. These two pieces are then closed and pressed so that the liquid silicone adheres to each microfiber in the mold.
Liquid injection moulding
First of all, the silicone will be subjected to extreme heat. Therefore, it will gradually soften. Then, this extremely elastic and malleable material is injected into a mold and then left to rest. Finally, the silicone will gradually cool and solidify by having totally agglomerated the shape of its mold.
All parts manufactured by Progress Silicones in molding or overmolding are made of LSR (Liquid Silicone Rubber) which due to its chemical composition is inert. It is biocompatible, hypoallergenic and non-allergenic which makes it perfectly adapted to food contact. This material offers a much better quality alternative to rubber or TPE for migration problems or interaction with other active ingredients:
▼ This thermosetting polymer adopts a permanent state once molded. This is what makes its value compared to a thermoplastic that can melt after molding.
▼ Extremely resistant, LSR can withstand a constant temperature of 316 degrees and intermittent temperatures of 371 degrees.
▼ Of great flexibility, it can have an elongation at break of 480%.
▼ It can be applied to parts not exceeding 11355 mm2 and it has 6 surface finishing options.
▼ The draft degree of the LSR is 25.4 mm deep and parts with a single undercut are compatible.
▼ The walls of the part must be of a minimum thickness of 0.25 mm while the thickness of a rib must be 0.5 to 1 times that of the adjacent wall.