MAHLO – Quality assurance of masks & medical protective clothing

Control basis weight and material thickness with the beta sensor Gravimat DFI from Mahlo

Weight and thickness have a great influence on the functionality of nonwoven goods. Especially in corona times, quality plays a major role. Doctors and nursing staff in particular, who face a high risk of infection every day, must be able to rely 100 percent on the quality of medical products such as masks or protective gowns.

Thanks to decades of experience and a wide range of measurement and control technology, the German company Mahlo GmbH + Co KG can support manufacturers in monitoring and controlling important parameters during the production process. Various sensors are available depending on the application.


Precisely determine weight and material thickness

The Gravimat DFI sensor is part of the modular Qualiscan QMS » quality measurement system and measures weight and material thickness using isotope radiation. The measurement is based on the attenuation of radioactive radiation by the substrate in the measuring gap. This weakening of the intensity is a measure of the basis weight of the goods.

Mahlo works with different isotope variants in order to do justice to different material properties. Krypton-85 is used for goods with a weight between 10 and 1400 g/m², strontium-90 is used for 100 to 6000 g/m².


Proven and reliable function

The transmitter in the traversing sensor beams onto the running web. Due to its mass, the radiation reaches the receiver in a damped manner. The values of the transmitted and received radiation are calculated to obtain the weight per unit area. Mahlo uses a multi-channel receiver in which the incoming measuring radiation is distributed to different areas of the fabric surface. In this way precise values are obtained, no matter what position the fabric is currently in.

This method also solves one of the biggest problems faced by manufacturers of web-shaped goods such as hygiene fleece: measurement inaccuracies due to fabric flutter. Its sensor technology makes the Gravimat DFI immune to changes in the center of gravity. It measures precisely and unaffected by any changes in degree of dryness, density or thickness.

The Gravimat DFI does not require strong absorbers or highly radioactive sources. Nevertheless, the highest precision, speed and resolution are guaranteed. The sensor can be used for practically all nonwoven applications.

For non-woven fabric used for face masks, air permeability is of particular importance. After all, the wearer must be able to breathe easily. In this case, Mahlo combines basis weight measurement with an air permeability sensor, which can also measure on the running web with a light touch.


Quality assurance from Mahlo – in the service of health

Manufacturers of medical goods are currently under pressure to deliver their goods as quickly as possible, but still with high quality. With process control systems from Mahlo, this balancing act is not only easier to master – production costs are also further reduced. The automatic basis weight control significantly limits the spread of the basis weight and thus guarantees a more uniform end product. Suitable setpoint settings with minimum tolerance ranges, in addition to ensuring product quality, save considerable material and energy costs. In addition, a safety margin is eliminated, which otherwise means loss of goods and time.


Contact us!

With Matthias Wulbeck, Area Sales Manager and Product Manager QCS, you have an experienced and committed contact person at your side.

Matthias Wulbeck

Matthias Wulbeck

Area Sales Manager Western Germany, Europe, Russia | Sales Manager / Product Manager QCS

 +49 9441 601 123
 +49 9441 601 102


More detailed information on the products, brochures and topic-related technical articles can be found in the download area of our website. There you can also download this article as PDF.

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Measuring spunlaced nonwovens – MAHLO

Mahlo infrared technology for the most accurate results

Production of protective masks from non-woven fabricThe protective mask production is running at full speed (InkheartX /

Non-nuclear measurement: Mouth and nose protection, disposable protective gowns and gloves are currently among the most important articles in the corona crisis. Above all, medical personnel and first-aiders such as the fire brigade and police are dependent on them – and must be able to rely 100 percent on their functionality. With its systems for process control and quality measurement, Mahlo GmbH + Co. KG has been supporting manufacturers in the reliable production of high-quality nonwoven articles for decades.

In a nonwovens line, the moisture content after spunlacing and the basis weight and residual moisture profile after drying are important parameters for ensuring quality and optimizing the production process. The production process has to run in such a way that the product is guaranteed to have the desired functions, but still be as cost-effective as possible for the manufacturer. The key to success is automated measurement and control of these essential parameters.

For example, if the weight does not correspond to the specifications, this can lead to errors in functionality, but also to unnecessarily high raw material consumption. A fleece that is too light for medical masks may no longer be able to meet all safety standards and thus become a health hazard. Nonwoven webs that are used as supports for operating tables are also typical spunlaced nonwovens. If this type of product is too heavy, it does not affect function and safety. However, more resources are wasted than actually needed. The result: rising costs and a higher burden on the environment. The same applies to the residual moisture in the product. If the product is too moist, there is a risk of mold growth, and if the fleece is too dry, the energy consumption in the line is too high.

The advantages of quality control are obvious: If critical parameters are systematically controlled and regulated, this is reflected in higher fabric quality. This means less rejects and less consumption of raw materials. This not only saves manufacturers time, but also money.

Basis weight and moisture analysis with non-nuclear measurement

A conventional method for determining both values is to measure the moisture with a simple infrared or microwave sensor in combination with a beta or X-ray sensor for the basis weight. Because of the radiation and the safety requirements associated with it, the user would like to avoid nuclear measurement if possible. This is easily possible with Mahlo’s sensor technology. For spunlace products, mainly fibres such as cotton, PE, PET or rayon are used. These have the pleasant characteristic that they absorb light in the near infrared range. Water and the other materials have different spectral ranges and can thus be distinguished. By measuring the attenuated radiation, the moisture content and the weight per unit area of different materials can be determined.

Therefore, only one Mahlo infrared sensor, calibrated for the respective fibre types, is required to determine and evaluate the values. The measuring process is contactless, non-destructive and without unwanted influence on the product properties. This method is particularly useful when a manageable quantity of different goods is produced. The calibration is adapted to the products and stored in the article memory.


The necessary measurement and control tasks are performed by the modular quality control system Qualiscan QMS »  from Mahlo. The cross direction profile of the measurement is displayed over the entire fabric width by means of traversing sensors. Depending on the application, the infrared sensors Infralot IMF or Infrascope NIR are used.

Mahlo has already successfully implemented many such applications and offers the user a perfect tool with high measuring accuracy and easy handling. Our technical service ensures that the desired measures are implemented 100%. Not only can products with “zero defects” be manufactured continuously, but quality, efficiency and profit can also be increased in the long term.

Contact us

With Matthias Wulbeck, Area Sales Manager and Product Manager QCS, you have an experienced and committed contact person at your side.

Matthias Wulbeck
Matthias Wulbeck

Area Sales Manager Western Germany, Europe, Russia | Sales Manager / Product Manager QCS

 +49 9441 601 123
 +49 9441 601 102

More detailed information on the products, brochures and topic-related technical articles can be found in the download area of our website. There you can also download this article as PDF.

To Downloads »



 Seguiamo costantemente gli ultimi sviluppi relativi a COVID-19 e applichiamo ogni tipo di misura adeguata per proteggere i nostri dipendenti garantendo il rispetto delle regole del distanziamento sociale.Oltre alla rigorosa osservanza delle misure igieniche, abbiamo anche una politica di suddivisione chiara di tutti i team in gruppi, che a turno lavorano o da casa o sul posto. 



desde la izquierda: Fabrício Rampani, Frank Bernhard 

A partir del 1 de julio de 2020, el fabricante alemán de maquinaria textil y líder tecnológico BRÜCKNER estará representado en Brasil por una nueva agencia. Con efecto inmediato, la renombrada empresa MBR Máquinas Têxteis Bernhard e Rampani también dará a los clientes de BRÜCKNER en Brasil asesoramiento y apoyo competentes. Frank Bernhard y Fabrício Rampani, los dos propietarios de MBR, ya se han familiarizado con la cartera de productos de BRÜCKNER y por lo tanto están bien preparados para su futuro trabajo.


There is a gas that has been used for over 100 years to disinfect, sterilize, render non-toxic water, air, and surfaces in the fields of food, medicine, pharmaceutical, etc.

This gas is lethal for various pathogens and for most viruses because it alters their RNA and DNA, and, at high concentrations, it also undermines the capsid, or external protein shell. Several authoritative scientific studies show, it is effective in 99% of cases.

We’re talking about Ozone.

Since 2010 we at Tonello have been producing technologies that use ozone reliably and safely. These technologies are also used to sanitize and disinfect garments, accessories, and equipment.

Today, in the midst of the global emergency caused by the COVID-19 virus, we are particularly happy to present the complete Tonello sanitizing range, from production to the shop: in fact, the disinfecting technology can be installed on all of our washing and dyeing machines, while a specific software upgrade will allow conversion of the ozone technologies already in use for the treatment of denim (Ofree, ECOfree or ECOfree 2) to also allow sanitizing and disinfecting.

And for those who are not yet using Tonello washing and dyeing machines?

Tonello Sanicare Industrial

The upcoming reopening of clothing stores brings with it two fundamental questions: how to make garment try-ons safe for the customers?

And how to give shopkeepers the certainty that they are following a protocol which, beyond the now normal “format” (social distancing – staggered entrance – gloves – masks – sanitizing gel), is actually virus-proof and allows them to go back to work with relative serenity?

In this case, the definitive solution is SaniCare, a new range of static cabinets for sanitizing, and disinfecting garments, accessories, and protective devices. The SaniCare cabinets allow garments to be re-readied for try-on or sale in just minutes.

SaniCare cabinets are safe, easy-to-use, and available in different sizes, in order to meet the needs of various types and sizes of commercial environments: from large spaces in shopping centers to city boutiques, today they can offer their clients an even more salient service. In addition, a more industrial size has been designed for disinfecting during the last phase of garment production, before shipping.

Tonello Ozono Disinfection

In fact, SaniCare neutralizes most known pathogens: the customer in a shop can thus try on garments with complete confidence that there are no dangerous viruses, fungi, dermatitis, or other annoying dermatological contamination, etc. lurking on the garments.

One day, hopefully very soon, the COVID-19 will be defeated, but something has already changed forever, even, and above all in the habits of consumers and the increasingly attentive and aware requests from the final customer.


That is something that for us at Tonello has been our “mantra” forever.