Biocomposite processing

Technology
Technology details
Name:	Biocomposite processing
Category:	Material processes and technologies
Feedstock:	biomass-based material (like wood, dust, agricultural wastes or sidestreams)
Product:	Biocomposite

Compounding process

Interior carpeting of a car's door made by a biocomposite of hemp fibres and polyethylene

In Biocomposite processing bio-based materials are processed to composite materials. Normally, these materials consist of a polymeric matrix that can be fossil- or bio-based. Bio-based materials fixed in this are for example wood dust, natural fibres, straws, rice husks, nutshells and others. Best-known biocomposites are Wood-Plastic-Composites (WPC) or Natural-fibre reinforced materials.

Feedstock

Origin and composition

Biocomposite processing is a secondary process where a composite material is formed by a matrix (resin) and a reinforcement of natural fibers or filling with other biomass-based materials like wood dust, agricultural wastes or sidestreams from food processing like nutshells or rice husks. In principal, the matrix can be a bio-based or a petro-based resin, but normally polymers like polypropylene, polyethylene or epoxys are used as matrix material.

Pre-treatment

The retting process, carried out with warm inoculated water, has been evaluated as a potential method to modify the structure of fibers in order to prepare polymeric biocomposites.

Process and technologies

Types of biocomposites

There are several types of biocomposites on the market that normally have a fossil-based matrix with natural fibre reinforcement or wood filling. In principal also the matrix can be bio-based consisting of bio-based polymers like PLA, bio-PE, biogenic epoxis or PHAs.

Processing technologies

In the compounding process the matrix materials are melted and then mixed with fillers, plasticisers, additives and fibres to a homogeneous formulate that can be given into a screw extruder. This produces an extrudate that will be cooled down in a water bath and then cutted into composite granules. The granules can be used to produce several types of products e.g. by injection moulding or other material processing technologies.

Product

Products of Biocomposite processing are different kinds of biocomposites.

Post-treatment

• Cutting
• Blown film extrusion

Biocomposite pellets are processed in an extrusion line machine, forcing the melt through a narrow slit die. The resulting thin film has the form of a tube also called a “bubble” (blown film).

Film blowing is a process of producing film by extrusion of molten biocomposite polymer into a continuous tube. The elements of the process include the resin pellets which are fed through a hopper into the extrusion line. Heat and friction convert the pellets to a melt which is forced through an annular or ring-shaped die to form a tube. The tube is inflated to increase its diameter and decrease the film gauge. At the same time, the tube is drawn away from the die, also to decrease its gauge. The tube, also called a “bubble,” is then flattened by collapsing frames and drawn through nip rolls and over idler rolls to a winder which produces the finished rolls of film.

As the tube inflates, its thickness becomes uniformly thinner as orientation in the transverse direction occurs, allowing a variety of thicknesses to be produced by combined control of the extruder throughput, inflation, and roller speed. As the inflation diameter increases relative to the annular die size, material orientation is increased and this ratio is known as the blow-up ratio. The extrusion die is shaped as a circle and air pressure is used to further expand the film. After it is expanded to the desired dimensions it is cooled to solidify thus creating flexible films for different applications.

Technology providers

Technology comparison

Company name	Country	Technology category	Technology name	TRL	Capacity [kg/h]	Feedstock: Food waste	Feedstock: Garden & park waste	Matrix material: Epoxys	Matrix material: PE	Matrix material: PP
Mi-plast d.o.o.	Croatia	-	Biocomposite blown extrusion processing	6	-
Zelfo Technology GmbH	Germany	-	Natural Fibre Engineering	9	500-2000		●

Mi-plast d.o.o.

Biocomposite processing provider

General information
Company:	Mi-plast d.o.o.
Country:	Croatia
Contact:	mi-plast@mi-plast.eu
Webpage:	https://mi-plast.eu/en/
Technology and process details
Technology name:	Biocomposite blown extrusion processing	Technology category:	Conversion (Material processes and technologies)
TRL:	6	Capacity:	kg·h-1
Application fields:	Packaging industry	Matrix:
		Other:
Feedstock and product details
Feedstock:	Bio-based polymers	Product:	Flexible films and bags

Mi-plast is a private company based in Rijeka, Croatia, and has been active as an industrial producer of polyethilene flexible packaging since 1993. Its portoflio includes products used in construction, agriculture, packaging industry and retail. In 2010s, the company formed a Research and development department with the purpose of following the global ambition in reducing the environmental footprint. Participation in EU funded programmes enabled Mi-plast to gain knowledge on production of biocomposite polymers.

Zelfo Technology GmbH

Biocomposite processing provider

General information
Company:	Zelfo Technology GmbH
Country:	Germany
Contact:	Grégoire de Vilmorin
Webpage:	www.zelfo-technology.com
Technology and process details
Technology name:	Natural Fibre Engineering	Technology category:	Conversion (Material processes and technologies)
TRL:	9	Capacity:	500 to 2000 kg·h-1
Application fields:	Moulded Fibre: Fibre Boards	Matrix:
		Other:
Feedstock and product details
Feedstock:	Cellulosic (virgin or recycled) and ligno-cellulosic (agro-residues) sources	Product:	Self-Binding fibres

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