10/01/2013

www.gupta-verlag.de/rubber

Maplan: Zero-defect manufacturing of O-rings and rubber seals

The core of the concept is an injection moulding machine MHF700/300XL editionS from Maplan Austria and a 4 x 54-fold mould from the Italian mould maker ORP Stampi with four-drop cold runner technology. Thus the seals can be dispatched flawlessly, a quality assurance final inspection was involved in the concept. The mould engineering of the exhibit of ORP Stampi shows a 4?x?54-fold mould where sealings are injected into four pads. The four-nozzle cold runner mould (CRB=Cold Runner Block) of the latest generation is designed with open nozzles, quick opening device, temperature control, and regulators for volume flow control. The four nozzles fill each pad (containing 54 cavities) with an elastomer. This brings an output capacity of 216 sealings per cycle. NBR 65Sh A in orange is used as a sealing material which is originated from the compounder Mesgo. Each part has a weight of about 0.25 g. The total shot weight of the four pads amounts to 420 g.The horizontal Maplan machine MHF700/300XL editionS is equipped with special options from the manufacturers modular kit fitting to the injection process. Besides higher reproducibility and injection capacity, the FIFO dual injection unit is equipped with a nozzle retract and is now also available in "1200-ccm execution". The energy concept of the drive corresponds to the Cool Drive II Standard. A very short nozzle assures maximal injection pressure directly on the cold runner.Thus the machine covers all current mould concepts from simple two-plate moulds to cold-runner systems with automatic demoulding. The brushing system is made by Rubber System and consists of an electrically driven single-arm servo brush with horizontal adjustment for effective demoulding of parts.The task of GiBiTre instruments is to plan the entire production pro­cess and to create production related work equipment for measurements and tests. GiBiTre has at its disposal a consolidated horizon of experience in processing elastomers. This includes effective tests of not vulcanised compounds as well as the test of the finished rubber moulded parts.From Gamma Stampi comes the punching machine for separating parts. It guarantees a perfect job punching out the sealings and hence avoid "reworking”. This not only saves time and costs, but also makes the parts directly available for final inspection. The final inspection is carried out by devices from UTP Vision, which is a manufacturer of high precision equipments for "intelligent inspection”. Their tasks are twofold: testing quality of parts and sorting out faulty parts. The inspection consists of an optical test installation. It checks the dimensional accuracy of the sealings, surface finish, and injection deviation. The finished parts can then be shipped directly to the processors. The inspection module of UTP Vision is thus an important tool for zero-defect manufacturing in elastomer processing.Hall 16, stand B47-3, hall 11, stand E27

www.gupta-verlag.de/rubber