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Flow straightener

Combined processing of PBT and LSR

The combination of different materials to create multi-functional components in a single production step is one of the domains of plastics processing. Flow straighteners in shower heads are a good example: thanks to the elastic LSR nozzles integrated in the solid PBT main body, scale can be removed with ease.

Flow straighteners for shower heads are produced, inspected and packaged fully automatically in a production cell built around an electric two-component injection moulding machine from the ALLDRIVE series. This enables efficient high-volume production of this complex hard/soft combination.

Basic specifications

Technology

MachineFlow straighteners for shower heads are produced from PBT and LSR on an electric two-component ALLROUNDER 570 A, which is equipped with two size 170 injection units. Two pre-moulded parts and two finished components are produced in a cycle time of 40 s in a consistently high part quality.to electric machines

Robotic systemTransfer technology is the ideal answer for hard/soft combinations such as the flow straightener. The vertical MULTILIFT V robotic system turns the pre-moulded parts over in the mould. In addition, it removes the finished parts and transfers them first to a cooling station with integrated visual inspection, then on to a packaging system.to linear robotic systems

Process

Multi-component injection mouldingFor the combined processing of thermoplastics and liquid silicone in a single mould, the necessary thermal separation presents a challenge: while the PBT needs to be cooled, the LSR cross-links at high temperatures. For a fully automated process, transfer technology offers the ideal solution.to the process

Liquid silicone injection moulding (LSR)For sprueless part production, both the PBT main body and the LSR nozzles of the flow straightener are directly injected using hot and cold-runner technology. As a result, no non-recyclable waste is generated. Efficient use of materials is also ensured by an optimised emptying system for the LSR dosing unit.to the process

Industry

Technical injection mouldingIn technical injection moulding, high-precision components can be produced for a wide variety of applications. The production of flow straighteners is an example of how sophisticated mould technology and complex workflows can be comprehensively automated.to the industry