Knowledge + Technique
Technical articles, patents and field tips from over 50 years of industrial heating and mould making.
Venting & valves
Dynamic Mold Venting
With alternative venting valves, WEMA — manufacturer of standard components for mold making — aims to overcome the limitations of conventional mold venting and to further increase…
Mould components
Components for quality optimization
Three small but effective WEMA components help injection moulders to improve product quality and extend tool life: a dynamic mini venting valve, a cost-effective automatic gate cutting…
Energy efficiency
Energy efficiency in extrusion lines
Extrusion still offers significant potential for energy savings. A research project at SKZ Würzburg with Extrudex and Maincor developed an energy-optimised corrugated pipe line which…
Mould components
Innovative latch locks for injection moulds
Difficult-to-demould parts with undercuts, recesses or large production volumes require precisely positioned latch locks without stroke limitation. WEMA's type DT and DS latch locks…
Venting & valves
Effective venting of injection moulds
Reliable cavity venting is essential for high quality plastic parts. WEMA presents modular venting elements as well as a dynamic venting valve, both of which can be retrofitted to…
Mould components
Angussweichen vermeiden unnötige Kosten bei Produktionsausfällen
Kunststoffteile werden in den meisten Fabrikationen unter erheblichem Zeit- und Kostendruck produziert. Stillstände durch defekte Heisskanäleinheiten oder verstopfte Plastifizierschnecken…
Venting & valves
Correct venting in injection moulds
Insufficient venting of injection moulds quickly leads to burn marks, poor surface quality and rejects. WEMA's solution is a new mechanical valve that ensures reliable and dynamic…
Mould components
Efficient helpers for mould making
Lime deposits in cooling-circuit channels of injection moulds are virtually unavoidable. With the WEMA devices presented here, optimum cleaning is possible at any time — and the integrity…
Venting & valves
Tool venting: more important than ever
WEMA in Lüdenscheid presents a major extension of its product range for the complex topic of mould venting. There is a matching, field-proven venting solution for every application…
Venting & valves
Mould venting system: Advantages of the dynamic valve system
Insufficient venting of the injection moulds has a great influence on the quality and on the service life of the moulds. As a result, each part will be at risk of having ugly aesthetic…
Cooling & temperature control
Optimization of cooling circuits in injection moulds
If the mould designer tries to realize contour-following cooling circuits, he often has to find solutions to problems with disturbing ejectors or intersecting cooling channels. WEMA's…
Mould components
Flexible ejectors, particularly wear-resistant and easy to maintain
Plastic parts with hooks, openings and undercuts often pose a challenge for injection moulding. Flexible ejectors with a special geometry allow these parts to be reliably demoulded…
Mould components
New centring elements of the Z series with lifetime guarantee
As a strategic sales partner of the international Progressive Components group, WEMA offers polymag and centring elements with an exceptional service life. Test results show that the…
Mould components
New latch locks without stroke limitation
Plastic parts with undercuts, recesses or similar features must today be produced in any quantity. This places ever-growing demands on injection and die-casting moulds. WEMA's new…
Venting & valves
Newly designed venting system for injection moulds
One of the most frequent causes of complaint during the production of plastic parts is burn marks. The reason is insufficient venting of the cavity. The newly developed venting system…
Mould components
New innovative standard components increase the productivity of injection moulds
Innovative standard mould components developed by WEMA make injection-mould design considerably more economical. They cover cable management for hot-runner moulds, runner adjusting…
Energy efficiency
Every bar and every kilowatt-hour counts – energy savings with insulating cuffs and convection flaps
Simona AG is significantly reducing the energy consumption of its extrusion lines using insulating cuffs and convection flaps from WEMA GmbH. Around 300 different process values –…
Cooling & temperature control
Plastic temperature-control elements with a new fastening system for blow and aluminium moulds
High-performance blow moulds require optimised cooling circuits to ensure consistent, reproducible part quality. WEMA's newly developed connection system features a self-sealing closure…
Mould components
Reduce downtime during injection moulding by runner adjuster units
In today's world, moulded parts are produced fully automatically in most cases, this includes an affiliated quality control. The setup procedure of moulds, which consists of fitting…
Mould components
The smallest guided, flexible ejector for undercuts
Plastic parts made of thermoplastics offer the advantage of flexibility for assembly. Using snap-fits, openings or interlocks, such parts can be joined cost-effectively. In the injection…
Mould components
Reducing downtime in injection moulding with runner adjusters
Today, moulded parts are mostly produced fully automatically, with quality control closely integrated into the process. Setting up the mould – installing it in the injection moulding…
Mould components
Innovative standard component increases the safety of plastics-processing moulds
The principle of locking via a movable lever is now also applied to provide automatic, absolutely reliable locking of mould halves as soon as they are released from the machine. One…
Mould components
Optimum safety for plastics processing moulds
The newly designed components presented here greatly increase the safety of injection and compression moulds during and after production. For the mould-making industry this is a key…
Venting & valves
New innovative components for injection moulds
Growing competitive pressure forces mould makers to produce multi-cavity moulds. These not only mean a higher risk: if they cannot be operated reliably, the injection mould may come…
Cooling & temperature control
Deflection Tubes for Cooling Channels
When drilling cooling channels in a mould, space is freqüntly restricted by ejector or core pins, fixing screws or other inserts. WEMA's new standard deflection tube lets the designer…
Cooling & temperature control
Flexible Aluminium Cooling Element for Extruder Barrels
To boost cooling on air-cooled extruder barrels, cast aluminium half shells with cooling fins are normally fitted on the bare cylinder areas between the heater bands. The new flexible…
Energy efficiency
Energy-efficient System Optimisation Saves Costs
Energy efficiency in injection moulding is more than just a question of a powerful drive. A holistic view of the process – from material conditioning, plasticising, mould, machine…
Energy efficiency
Reducing Energy Consumption in Extrusion
Rising energy prices can be cushioned. A power-balance analysis helps an extrusion plant to determine the efficiency of existing equipment and provides starting points to use energy…
Mould components
Marking Unit with Replaceable Insert
The marking unit described here uses a replaceable insert that can be exchanged directly through the parting line. Lettering or contours can be machined into the insert, making the…
Energy efficiency
Plasticizing Systems Heated by Natural Gas – Distinctly Lower Energy Costs
In the search for potential savings in plastics processing, energy consumption is increasingly attracting the focus of attention – after all, electricity costs that are already high…
Cooling & temperature control
Mould Temperature Control System with New Connection Mechanism
High-performance injection moulds need optimised cooling circuits to deliver consistent part quality. WEMA introduces a temperature-control system whose newly developed connection…