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Home > News > Recycling

New approach allows continuous recycling of fiber-reinforced plastics for lightweight products

Source：Adsale Plastics Network Date ：2023-07-10 Editor ：JK
Copyright： Original work. Please do not reprint.

The environmental impact of non-degradable plastics is increasing and requires new recycling strategies. At the Fraunhofer Institute for Production Technology IPT in Aachen, researchers have developed a novel recycling process to recover the fiber composite material of used pressure tanks in a peeling process and reuse it for new lightweight products.

 

The aim is to recycle fiber-reinforced plastics (FRP) without any significant loss of product quality. The Fraunhofer team has now succeeded in doing so in the "Tankcycling" research project: Over 90% of the mechanical strength properties are retained in the recycled material.

 

Fiber-reinforced pressure tanks for hydrogen storage

 

Since hydrogen is regarded as the energy storage medium of the future and since this odorless gas has to be stored under high pressure, its use in trucks or automobiles inevitably entails the question how to store it safely. This is achieved when hydrogen is stored in high-quality pressure tanks made of carbon fiber-reinforced plastics.


recycled plastics

Recycled thermoplastic carbon fiber-reinforced UD-Tape.


These pressure tanks must be highly resilient and at the same time lightweight and corrosion-resistant so that they are suitable for electromobility. In the wake of the energy transition, the demand for high-quality hydrogen tanks has increased. In principle, however, other liquids or gases can also be stored in fiber-reinforced pressure tanks.

 

Recycling carbon fiber reinforced tapes by unwinding

 

Such pressure tanks are manufactured in a laser-assisted tape winding process. In this process, thermoplastic glass- or carbon-fiber-reinforced tape is wound over a base body made of plastic, the so-called liner. The unidirectional (UD) tape that covers the pressure tank cannot be reused in the conventional life cycle of the pressure tank and ends up in hazardous waste dumps.

 

The recycling process patented by Fraunhofer IPT, which it continued to develop in the "Tankcycling" project, makes it possible to remove the UD tape from the liner in a peeling process. In this way, this tape can be reused for other products that are also manufactured with the tape winding process.

 

The Fraunhofer IPT researchers have developed a plant prototype with various modules: the tape passes through one in the recycling process before it is stored onto a spool at the end in another.

 

Tank recycling module connected to a robot head

 

In downstream tests, the scientists checked the mechanical load-bearing capacity of the recycled material and the original material. Here it was shown that the recycling process did not reduce the quality of the material significantly. Destructive standard tests demonstrated that the recycled material had lost only 5-10% of its mechanical quality compared with the virgin material.

 

Based on these findings, the researchers were able to define the requirements for the recycling process and develop a tank recycling module. This module represents a further development of the recycling process, which was developed on a stationary test rig.

 

In its miniaturized format, the tank recycling module can be attached to a robot arm. This innovation allows pressure tanks with their complex three-dimensional geometry to be fully recycled. In addition, the recycling process and subsequent rewinding of the tape can be automated in this setup.

 

Reducing material consumption and environmental impact

 

The recycling process with its implementation in the tank recycling module efficiently explores the limits of what is technically feasible while saving energy, material and costs.

 

By recycling the fiber-reinforced plastic tapes, the process contributes to advancing the sustainable production of future thermoplastic fiber composite products that can be manufactured using the tape winding process.

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Source：Adsale Plastics Network Date ：2023-07-10 Editor ：JK
Copyright： Original work. Please do not reprint.

The environmental impact of non-degradable plastics is increasing and requires new recycling strategies. At the Fraunhofer Institute for Production Technology IPT in Aachen, researchers have developed a novel recycling process to recover the fiber composite material of used pressure tanks in a peeling process and reuse it for new lightweight products.

 

The aim is to recycle fiber-reinforced plastics (FRP) without any significant loss of product quality. The Fraunhofer team has now succeeded in doing so in the "Tankcycling" research project: Over 90% of the mechanical strength properties are retained in the recycled material.

 

Fiber-reinforced pressure tanks for hydrogen storage

 

Since hydrogen is regarded as the energy storage medium of the future and since this odorless gas has to be stored under high pressure, its use in trucks or automobiles inevitably entails the question how to store it safely. This is achieved when hydrogen is stored in high-quality pressure tanks made of carbon fiber-reinforced plastics.


recycled plastics

Recycled thermoplastic carbon fiber-reinforced UD-Tape.


These pressure tanks must be highly resilient and at the same time lightweight and corrosion-resistant so that they are suitable for electromobility. In the wake of the energy transition, the demand for high-quality hydrogen tanks has increased. In principle, however, other liquids or gases can also be stored in fiber-reinforced pressure tanks.

 

Recycling carbon fiber reinforced tapes by unwinding

 

Such pressure tanks are manufactured in a laser-assisted tape winding process. In this process, thermoplastic glass- or carbon-fiber-reinforced tape is wound over a base body made of plastic, the so-called liner. The unidirectional (UD) tape that covers the pressure tank cannot be reused in the conventional life cycle of the pressure tank and ends up in hazardous waste dumps.

 

The recycling process patented by Fraunhofer IPT, which it continued to develop in the "Tankcycling" project, makes it possible to remove the UD tape from the liner in a peeling process. In this way, this tape can be reused for other products that are also manufactured with the tape winding process.

 

The Fraunhofer IPT researchers have developed a plant prototype with various modules: the tape passes through one in the recycling process before it is stored onto a spool at the end in another.

 

Tank recycling module connected to a robot head

 

In downstream tests, the scientists checked the mechanical load-bearing capacity of the recycled material and the original material. Here it was shown that the recycling process did not reduce the quality of the material significantly. Destructive standard tests demonstrated that the recycled material had lost only 5-10% of its mechanical quality compared with the virgin material.

 

Based on these findings, the researchers were able to define the requirements for the recycling process and develop a tank recycling module. This module represents a further development of the recycling process, which was developed on a stationary test rig.

 

In its miniaturized format, the tank recycling module can be attached to a robot arm. This innovation allows pressure tanks with their complex three-dimensional geometry to be fully recycled. In addition, the recycling process and subsequent rewinding of the tape can be automated in this setup.

 

Reducing material consumption and environmental impact

 

The recycling process with its implementation in the tank recycling module efficiently explores the limits of what is technically feasible while saving energy, material and costs.

 

By recycling the fiber-reinforced plastic tapes, the process contributes to advancing the sustainable production of future thermoplastic fiber composite products that can be manufactured using the tape winding process.

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New approach allows continuous recycling of fiber-reinforced plastics for lightweight products

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