09/27/2013

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LWB Steinl: Productivity increase through new cold-runner technology

They result from a smaller amount of material for the sprue system and the cure time reduction by the EFE injection technique. These productivity gains will apply for mouldings with medium to thick walls resp. very different wall thicknesses. To demonstrate the new level of productivity, a vertical, downward closing VSEFE 2700/2000 B with fully hydraulic clamping unit will be shown in production in combination with a four-cavity cold runner from the development partner Stefan Pfaff Werkzeug- und Formenbau, Roethenbach, Germany.LWB Steinl has identified a significant demand in the rubber industry for integrated automation solutions. In accordance with this trend, the company has together with awetis engineering + manufacturing GmbH, Laudenbach, Germany, established a production cell for the fully automatic production of a radial shaft seal ring, which can be seen in production at the LWB stand. The core unit of the production system is a vertical C-frame machine type VCF 500/160. It is combined with a two-fold cold-runner mould, an insertion and removal handling for the metal parts integrated in the C-frame and a finishing station including a robot for the post-treatment of the moulded components by separating the central diaphragm sprues from the moulded rings.The third highlight on the LWB stand will focus on fully automatic and post-treatment-free production of micro parts made of thermoplastics, rubber and other elastomers. LWB Steinl introduces as an addition to the proven horizontal micro class machine HCQ 100/6 a vertical version of the machine system with the type designation VCRS 100/10 bc. Common for both versions is the C-frame clamp unit with 100 kN clamping force and a precision-plasticising/injection unit with 14 or 16 mm screw and a stroke volume from 4.5?-?10 cm3. The injection unit is designed for up to 4 x 8 mm or lines up to 8 mm in diameter for the processing of standard plastic granules, rubber strips, but can also be easily fitted with a matching stuffer-unit for solid silicones. The repeatability of the shot weight is within the range of ±0.005 g. The combination of a needle-shut-off cold- or hotrunner system allows for an economic production of flash-free mouldings without any need for post-processing. The tiebarless C-frame clamping unit can easily be fitted with a handling device. Overall, it was taken in machine design to maximise compactness. Thus, the footprint of roughly 1 m2 includes not only the machinery itself but also two temperature controllers.LWB Steinl also offers options for the processing of TPE. As a representative example, the vertical C-frame VCRS 500/115 tc with a vertical screw injection unit will be on display (see also p. 191 of this issue).Hall 14, stand A68

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