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Assembly of Highly Integrated Car Window Modules Through Injection Molding

LWB Steinl Machinery is uniquely positioned to solve the manufacturing challenges of molders looking to reduce manufacturing cost, improve part quality and reduce labor burden, says President of LWB Machinery North America Tim Crites. LWB’s Machinery and Automation Divisions work seamlessly to assure project success for glass encapsulation and overmolded parts.

LWB-Steinl injection molding technology at Henniges Automotive / Rehburg-Lower Saxony

The integration of individual parts to a multifunctional assembly is one of the important innovations of plastic injection molding. For example, the production of glass window modules for car rear doors, as practiced at multiple automotive suppliers.

The parts consist of the glass pane, a web strip and fastening clips, which are overmolded by a TPE frame to a ready-to-install assembly. For that specific injection molding task, many molders rely on vertical C-frame injection molding machines from LWB-Steinl.

Assembling on a horizontal or a vertical machine?

Both horizontal and vertical injection molding systems are used for the injection molding assembly of window glass modules.

LWB offers not only one but several vertical machine systems in scalable variants. This allows our customers a shortcut to the appropriate system specification without having to compromise.

For example, a vertical tie-barless C-frame machine can be used in combination with a rectangular designed rotary table system by LWB. That configuration provides the desired generous clamping dimensions and at the same time offers the best accessibility to the working area around the injection molding tool.

With a clamping area of 1300 by 650 millimeters for each mold and an equally large center area with all media and energy connection, everything fits exactly to the glass overmolding tools in use.

In particular, the tool set-up process benefits from the specific LWB rotary table layout. That is evident in comparison with an older vertical machine with a conventional rotary table, still in operation in many molding facilities.


Founded in 1962 by Alfred Steinl, the company started with punching tools and rubber processing machinery. Today, the company, still managed by the Steinl family, is one of the world’s leading manufacturers of rubber injection molding machines. The product portfolio covers the complete range of rubber and plastic injection molding machines, from the vertical C-frame machine to vertical four-tiebar or gantry-frame machines, to horizontal tiebar and tiebarless C-frame machines.

The company currently employs around 250 people and has about 500 machines per year, based in Altdorf near Landshut.

For more information, see lwb-steinl.de


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