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Picture shows transparent plastic parts from ENGEL

Injection Moulding for Transparent Plastic Parts

Top Quality for a Perfect View

Transparent plastics offer great potential in various application areas. The design freedom offered by the injection moulding process and energy-efficient processing combine with the advantages of lightweight construction. This is especially important in the automotive sector. Optical and transparent plastic parts place high demands on processing.

Advantages of Injection Moulding for Transparent Plastic Parts
Gentle plasticising thanks to optimum machine design
Picture shows plasticising screws from ENGEL

Special screw geometries and different screw materials are designed for different materials, for example PMMA, PC or COC. The right geometry ensures gentle plasticising.

Patented multi-layer process for better component quality
Picture shows transparent plastic lens from ENGEL

ENGEL's innovative injection moulding processes guarantee precision and absolutely flawless products. A patented multi-layer process supports you in the production of optical and transparent plastic components such as lenses of high quality and perfect transparency.

Solutions for a wide range of applications
Picture shows optical plastic component from ENGEL

ENGEL is your reliable partner. Whether you are producing the smallest lenses for smartphone cameras, thick-walled automotive lenses or PMMA light guides. With structured solutions and pioneering injection moulding processes, we create high surface quality while adhering to the lowest tolerances.

Increase melt quality with software solutions
Image shows digital solution for improved melt quality from ENGEL

Our optimelt sequence software solution is an important addition to our portfolio. It allows an extension of the machine sequence and opens up new plasticising possibilities. The melt is pressurised, which improves the melt quality, thus avoiding micro-defects in the transparent plastic component.

Picture shows Vice President Global Application Engineering at ENGEL Austria
Are you a manufacturer of high-quality optical and transparent plastic components?

Take advantage of our extensive experience and expertise in this area to make your products even better. We will be happy to advise you.

Picture shows optical components from ENGEL
Defect-free Interior for Brilliant Images

The optimelt sequence software reduces micro-defects in optical and transparent plastic components.

Injection Moulding Processes for Optical and Transparent Parts: An Overview

Procedure Product name Industry Application Process
Processing of transparent materials optimelt Electronics, Automobile & Mobility Lenses and light guides, Glazing Production of transparent components for optical applications
Silicone injection moulding LSR/LIM Electronics, Automobile & Mobility Lenses and light guides Processing of materials that only cross-link in the mould
Injection compression moulding coinmelt Automobile & Mobility Thin-walled glazing (combination with multi-component injection moulding possible), Head-up displays, Headlight covers Production of particularly precise components by mould compression
Details of our Injection Moulding Processes for Optical and Transparent Plastic Parts
Picture shows injection-moulded transparent lens from ENGEL
Processing of Transparent Materials

In order to further optimise the optical component qualities of PMMA light guides, for example, we create a close symbiosis between the machine and special peripheral devices.

The range is wide:

  • Dedusting devices for starve-fed plasticising with nitrogen flushing

  • High-resolution camera systems for inline quality control

Your Advantages with the optimelt Process
Gentle Processing

This injection moulding process enables gentle plasticising and homogenising of transparent plastic melts.

Plasticising Unit Cleans Itself

By self-cleaning the plasticising unit, you can reduce material degradation. Trapped material would degrade in the plasticising unit.

Component-compatible Process and Plant Technology

The injection moulding process and the plant technology are fully adapted to the transparent plastic parts produced.

Integration of Suitable Peripheral Devices

To use suitable peripheral devices, we integrate them completely into your production cell.

  • Better melt quality

  • Fewer impurities in the component

Picture shows transparent plastic components produced by silicone injection moulding
Silicone Injection Moulding
LSR (Liquid Silicone Rubber) / LIM (Liquid Injection Moulding)

Micro-silicone parts, baby bottle teats or large-volume insulators are just a few examples of the use of LIM (liquid injection moulding). The technology for processing LSR is the first choice especially for optical components that are exposed to high thermal loads, as in LED headlights, for example. This allows you to produce parts from liquid silicone in a single step without reworking and waste.

Your Advantages with LIM
Efficient Manufacturing

Fully automatic silicone processing in injection moulding around the clock.

Variable Systems

LIM injection units with screw conveyor or injection plunger.

Perfect Support

Production support through various metering pumps integrated into the ENGEL control unit.

Individual Solutions

Depending on the application, hydraulic or all-electric, horizontal or vertical injection moulding machines.

  • Precise manufacturing

  • Low burr occurrence

  • Rework- and waste-free products

Lenses for LED Headlights with LIM

Video shows production of transparent plastic lenses >
Picture shows transparent plastic component from ENGEL
Injection Compression Moulding

Precise surfaces for particularly high demands: With the ENGEL coinmelt injection compression moulding process, you can achieve perfect quality for your transparent plastic parts. From automotive glazing and optical lenses to moulding the finest, micro-scaled structures.

Your Advantages with coinmelt
Lower injection pressure requirement compared to injection moulding

You need less injection pressure to produce transparent parts and so save energy.

Lower Shear with the Same Final Wall Thickness

The production of precise components with the same final wall thickness is possible.

Less Component Warpage

Lower stresses in the component and thus less warpage.

  • Uniform impression of structures

  • More even material distribution for greater shape accuracy

Discover More Injection Moulding Processes for your Plastics Production

Over 20 proven injection moulding processes for more cost efficiency and different areas of application

Picture shows surface finishing of a plastic component from ENGEL

Surface Finishing and Functionalisation

Injection moulding process for sophisticated component designs with additional functional integration

Picture shows lightweight elements made of plastic

Weight and Warpage Reduction

Injection moulding process for lightweight plastic components to reduce weight and warpage of your plastic parts

Picture shows plastic parts manufactured by precision injection moulding

Precision Injection Moulding

For more geometric accuracy, better surface quality and low component weight

Picture shows plastic component made of special material

Elastomers and Thermosets

A wide range of non-thermoplastics such as silicone, rubber, BMC or HTV can be processed in injection moulding

Picture shows recycled material

Injection moulding for recycled materials

More safety and consistently high product quality despite recycled material.

Picture shows plastic parts produced with injection moulding processes from ENGEL

Overview of all injection moulding processes

Over 20 Proven Processes for More Efficiency



Write to us

The ENGEL team will be happy to assist you with comprehensive know-how on the subject of injection moulding.

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