Innovative polystyrene, polypropylene & plastic packaging, bespoke packaging and technical parts - Knauf Industries.


Knauf Industries is always in phase with the changes in the food and industrial markets and knows how to respond with relevance and flexibility to the most varied needs.

R'kap® Kapseal® Kapclear® Kaplight®

Mono-materials in polypropylene PP

Our French extrusion and thermoforming plants produce packaging that is perfectly adapted to transparent or coloured, protective atmosphere or skin packaging, frozen, microwaveable, presentation and transport packaging.

Our mono-material packaging is perfectly adapted to workshop production lines and their sealing performance is excellent.

They guarantee a perfect sealing quality, even in the presence of dirt on the sealing area, and also guarantee an excellent seal, ensuring that the gas mixture remains in the packaging.

Finally, they offer real productivity gains compared to PET. For a seal at 160°C in less than 1 second, they can withstand a pressure of 420 mb.

Our materials for UVCI packaging in modified atmosphere & under skin

Mono-materials developed on a PP basis from Knauf Industries research.

Their food preservation performances have been validated by the ADIV (Agro-industrial Technical Institute of Meat Industries) and by PFI Nouvelles Vagues (platform at the service of the aquatic products industry). Kapseal® and Kapclear® obtain results comparable to those of PET/PE multilayer packaging on different criteria such as total flora, residual rate of O2 and CO2

The advantages of KAP’ materials:

  • Exclusive mono-materials
  • An excellent quality of welding, guaranteeing a good maintenance of the gas in the packaging
  • Total control of production in France
  • A 100% recyclable packaging validated by COTREP (the technical committee for the recycling of plastic packaging), for integration in the PP packaging recycling flow

Our process enables us to create packaging perfectly suited to all packing needs:  clear, coloured, modified atmosphere, frozen, microwavable for protection or for display or for shipping


Our products are designed using design and production simulation software.

As a manufacturer of packaging for the agri-food industry, we attach great importance to complying with hygiene and food safety requirements at our production facilities. For an active commitment to food safety matters, an HACCP (*) process is applied in the production areas assigned for food packaging.

By means of the latest-generation extrusion and thermoforming lines, Knauf Industries’ units guarantee routine high-quality products.

*HACCP: Hazard Analysis Critical Control Point

This guarantees our quality: optimal choice of material thickness and distribution!

Knauf Industries plastic food trays


The new mono-material suitable for food packaging made from up to 100% recycled post-consumer plastics.

Formulated on a PP base, it completes the KAP’ range of materials by combining technical, aesthetic and environmental advantages:

  • it offers a perfect sealing quality under protective atmosphere or under skin
  • it can be microwaved and pasteurized and is available in Kapseal®, Kapclear® and Kaplight®.

In addition to its excellent sealing qualities, R’KAP® is 100% recyclable in existing PP channels. R’KAP® is REDcert² certified.

REDcert² certification is a sustainability certification system, applicable on a European scale, which covers all sustainable raw materials (biomass, renewable energies, etc.)

This material innovation is a circular solution of choice: it reduces the use of fossil raw materials as these are replaced by a substance from post-consumer waste.

To date, all our plastic injection, extrusion and thermoforming plants are certified: Dreux (28), Pithiviers (45), La-Bernerie-en-Retz (44) and Torcé “Extrusion” (35).

A single material made of recycled and certified materials!

tray from recycled Knauf Industries called r'kap buster'bak_2


The French mono-material that protects and preserves

Kapseal® meets the needs of preservation, resistance, respect for the environment and competitivenessKapseal® packaging materials are easy and reliable to use industrially: they can be adapted to production lines in production areas and their sealing performance is excellent.

Furthermore, Kapseal® has a formulation developed on a PP base, a stable raw material in terms of cost and offering better medium-term visibility, unlike PS and PET.

Picture of Knauf Industries trays in Kapseal


The first microwavable clear mono-material.

Kapclear® is 100% transparent in order to enhance the freshness of products while preserving their colour, flavour and integrity. Developed for microwave ovens and pasteurisation, its transparency and clarity are comparable to those of PET and markedly superior to those of PP (as per the standard ISO 14782).

Photo of a Kapclear Knauf Industries transparent tray with a goldfish inside (like an aquarium)


The first detectable dark mono-material

Kaplight® is a carbon black free material that can be detected in an optical sorting centre. With Kaplight®, your packaging is always black, its visual is enhancing and its touch is soft.

Picture of a Kaplight Knauf black tray without carbon black

Conditioning under SKIN

The Kary® Peal Pure Line Tray is specially designed to adapt to the Skin process.


Its Kapseal® mono-material offers many advantages and this range is compatible with different types of sealing machines and sealing films.

Kapseal® and Kapclear® have a lower environmental impact than other plastic materials.

Practical and aesthetic assets

  • Increase of the DLC by several days depending on the packaged product
  • Micro-wavable and pasteurizable cold pack
  • Aesthetic and enhancing presentation of packaged products
  • Product qualitative highlight of the product by a contribution of transparency and relief
  • Excellence holding the tray and products packaged in vertical presentation. The GMS will close 75% of the refrigerated cabinets by 2020 and Kary® Peal Pure Line responds perfectly to this new radius constraint

Technical performance

  • Kary® Peal Pure Line responds to the mechanical constraints of the skin process*
  • It offers a smooth and even heat sealing range and the tray is compatible with a double seal
  • Its mono-material Kapseal® offers excellent welding quality with minimal risk of gas leakage, in comparison to other materials and a perfect peelability of the tray
  • Its eco-design allows a reduced environmental impact, with an optimization of the performances and the use material
* Resistance to welding (180 ° C), pressure and suction due to vacuum


Kapseal® and Kapclear® have a lower environmental impact than other plastic materials. Firstly, the production aims to be sustainable: less energy is required for the Kapseal® and Kapclear® extrusion process compared to other materials. The comparative LCA between Kapseal® and multi-layer complexes based on PS and PET demonstrates that Kapseal® is the material with the lowest environmental impact. Secondly, Kapseal® and Kapclear® are 100% recyclable. Their complete recyclability in selective sorting circuits (validated by COTREP) helps lower the environmental impact.

Finally, our packaging materials have an economical design. They are designed to account for material savings.

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