09. October 2019

Steinl Group: New vertical machines, automation, adhesive and sealing technology, and biopolymer applications

LWB Steinl, the manufacturer of rubber processing machines headquartered in Altdorf-Lands­hut, Germany, has emerged to a broad-based group of eight companies within the last eight years. Five of the eight companies will give a comprehensive overview of their expertise at K 2019 on the joint stand of the Steinl Group. Beyond elastomer injection moulding and rubber processing technology, these include, in particular, the adhesive and sealing technology, but also the development and application of fibre-reinforced biopolymers.

Vertical elastomer injection moulding machines with leading ergonomic levels

LWB Steinl will introduce a machine system featuring a vertical rotary table clamping unit, characterised by top marks in operating and maintenance ergonomics. Its central component is a stand-alone, therefore universally accessible, three-pillar clamping unit with a horizontal plasticising and injection unit, which centrally injects via a diverter through the upper machine plate. The horizontal plasticising and injection unit keeps the overall height of the production cell low, which is an operational advantage in halls with low clear height.

Due to this concept and the low round table clamping area of just 1,000 mm above the floor, the new machine concept offers ergonomic advantages, in particular for injection moulding tasks with a high proportion of manipulation, e.g. for the addition of rubber profile frames to car glass panes. The machine drive module including hydraulics is a stand-alone unit as well and thus accessible from all four sides for maintenance and set-up jobs.

The second example from the vertical machine programme is a C-frame machine with a clamping force of 1,000 kN and 1,000 cc EFE-injection unit. In combination with a two-cavity cold runner tool integrating a new cold-runner-system from ITS-Huber, which is capable for an operation optionally with or without pressure sensors in the mould cavity the production of rubber doorstops will be demonstrated.

Production cell with three-column clamping unit and injection via a horizontal plasticising and injection unit from above, based on the VSRS 2500/1000 machine type. (Source: LWB Steinl)

Production cell with three-column clamping unit and injection via a horizontal plasticising and injection unit from above, based on the VSRS 2500/1000 machine type. (Source: LWB Steinl)

Automated elastomer parts handling and post-processing

The automation potential is demonstrated with a two-machine production cell consisting of a top-closing C-frame-machine in thermoplastic version, type VCRS 500/115 and a portal-frame-machine, type VRF 1100/160. Assisted by a six-axis robot, they are moulding a two-component shaft seal consisting of a polyamide ring part and a moulded-on EPDM rubber seal. As a new feature, a plasma treatment station is used between the two injection moulding stations for optimum cleaning and activation of the polyamide surface. The sealing lip is then mechanically post-processed and checked for dimensional accuracy within the production cell.

Liquid sealing technology complements rubber element sealing technology

The Dreibond GmbH in Ismaning near Munich, part of the Steinl Group since 2013, focuses on the development of adhesive and sealant applications for high-volume production. Based on 40 years of experience, system solutions ranging from the development of liquid adhesives and sealants to the design and manufacture of process-reliable application systems in industrial assembly lines can be offered from a single source. The applications go far beyond the bonding and sealing of flat surfaces, e.g., up to rotor spray applications in holes, as well as the oiling and greasing of bearings and threads or the press fitting of sealing rings.

The “floating overhead position” of the plasticising unit above the clamping unit creates the prerequisite for a tool area accessible from all sides. (Source: LWB Steinl)

The “floating overhead position” of the plasticising unit above the clamping unit creates the prerequisite for a tool area accessible from all sides. (Source: LWB Steinl)

Biomaterials expertise since 2011

Biofibre GmbH, founded by LWB Steinl in 2011 and based in Altdorf/Landshut, Germany, develops, produces and sells natural fibre-reinforced bioplastics for thermoplastic processing into moulded articles, with a focus on injection moulding. The bioplastics produced are characterised by high eco-efficiency. It results from the production without fossil fuels and the high proportion of recycled plastics. The material development is carried out in close cooperation with the Technical University of Munich. The alliance with Naftex GmbH in Lower Saxony, which was acquired in 2019, ensures compounding in industrial quantities.

Rubber compound batch-off cooling units

The Italian company Prodicon International Slr., Milano, is the fifth company of the Steinl Group on display. Prodicon is specialised in the development and production of batch-off cooling lines and special machinery for the rubber compounding in the tyre industry, as well as in the field of technical rubber products.


About LWB Steinl
Founded in 1962 by Alfred Steinl, the family-owned company is today a leading manufacturer of rubber injection moulding machines. At the headquarters in Altdorf near Landshut approximately 250 machines are built each year by round-about 250 employees. The product portfolio covers the comprehensive range of rubber and plastic injection moulding machines, from vertical C-frame machines to vertical four-column or plate-frame machines, to horizontal, tie-bar and C-frame machines. In addition, “batch-off systems” are also manufactured for production-compatible storage of rubber compounds. Altogether, the Steinl Group currently consists of eight companies, which are clustered in four divisions. The largest division is mechanical engineering, consisting of the LWB elastomer injection moulding machine construction, the conveyor belt vulcanising machine manufacturer Vulctech, the LWB automation, the batch-off cooling line manufacturer Prodicon Ind. Srl and the injection moulding machine manufacturer URP (United Rubber & Plastic Machinery Ltd) in Langfang, China. In the stamping division STG-Carrier GmbH manufactures metal scaffolding strips for automobile door profiles. The third division is sealing and bonding technology with Dreibond GmbH, a manufacturer of adhesive systems and the consequent application technology. The fourth division is biomaterial production with the company Biofibre.

URL: https://www.gupta-verlag.com/news/technology/23247/steinl-group-new-vertical-machines-automation-adhesive-and-sealing-technology-and-biopolymer-applications