Nonwoven hygiene products
KARWEB NONWOVENS, based in Turkey, is one of the big global players in the sector of hygiene products with more than 270 product types made from nonwoven fabric. They export 80 percent of our production to 36 countries, like America, England and Italy. At their Spunlace plant, they can produce protective products against bacterial due to sophisticated technologies like Ozone Threatment and UV systems.
In the quality control process, which is of great importance in the hygiene sector, they rely upon the quality control system Qualiscan QMS-12 from Mahlo. With instant quality detection, they can continuously control the correct component mixture of their fibre products.
A traversing scanner (o-frame) of type Webpro M with two sensors for simultaneous measurement is used for the task. The infrared sensor Infralot IMF detects the moisture. The Gravimat DFI beta sensor measures the basis weight.
Pictures courtesy of Selçuk İplik, Turkey
Continuous control of the cross profiles of basis weight and residual moisture on spunlace nonwovens
Simultaneous measurement of residual moisture (Infralot IMF infrared sensor) and basis weight (Gravimat DFI beta sensor) on running web of spunlace nonwoven fabric
The Qualiscan QMS is displayed and operated via an ergonomic touchscreen. All important information is immediately visible. Operation is simple and intuitive.
Infralot IMF
Measurement of moisture / organic compound
Non-destructive, continuous analysis of various web or sheet parameters
Non-destructive, continuous analysis of various web or sheet parameters
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Absorption/reflexion of infrared light
Infralot IMF uses optical evaluation of the absorbed/reflected light energy in the near-infrared range to continuously measure and control material moisture on-line.
Product Highlights
- Non-radioactive
- Static simultaneous filter – simultaneous measurement of all wavelengths
- High spectral resolution
- Insensitive to product flutter and soiling
Customer benefits
- Non-destructive, continuous determination of various parameters of product webs
- Same-spot measurement dry/wet – optimized measuring accuracy
- No moving parts - wear-free and low-maintenance
- Broad range of applications through use of various measuring wavelengths
Light-specific wavelengths can excite the atomic bonds of certainmolecules to oscillate. These amount to a multiple of the basic resonance of the molecules. A large part of the incident light energy is absorbed by the material being measured.
If the light energy reflected or transmitted by the material to be measured is examined separately for each wavelength, a relationship is established between the degree of absorption of this resonance wavelength and the number of absorbing molecules. Dependent on the moisture content in the product, the light energy absorbed alters significantly at the resonance wavelength of the water molecule.
For stable measurements in practice, the measured light energy of the resonance wavelength is compared with other reference wavelengths at which no absorption occurs.
| IMF-R (Reflexion) | For one-sided measurement of coatings and light-weight products |
|---|---|
| IMF-T (Transmission) | For measurement of the product's overall thickness and composition |
| Specification | Value | Unit | ||
|---|---|---|---|---|
| Parameter | Basis weight & Moisture | |||
| Type | IMF-R (Reflexion) | IMF-T (Transmission) | ||
Measuring range | Paper | ~ 10 - 30 | ~ 10 - 200 | g/m² |
| Nonwoven | ~ 10 - 60 | ~ 10 - 500 | g/m² | |
| Measuring range Moisture 1 | ~ 0,2 - 15 | ~ 0,2 - 15 | % H2O | |
| ~ 0,2 - 10 | ~ 0,2 - 30 | g/m² | ||
| Measuring range Coating 1 | 0,2 - 200 | - | g/m² | |
1) Measuring range and measuring accuracy depending on the material (analysis of material sample necessary)
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