Infrared sensors
Infrared transmission / reflection – Measurement of moisture, basis weight, thickness
By means of optical evaluation of the reflected light energy in the near-infrared range (NIR), important product-specific parameters such as moisture (water), coating weight, thickness, and organic components in the web can be measured during the manufacturing process.
Its non-nuclear measurement technique is very selective and offers an accurate and cost-effective measurement solution that can be supplied in either single-sided reflection, or dual-sided transmission modes.
Flat bed printing & Rotary printing
Stamperia Pezzoli offers printing and finishing services for textiles for more than 35 years, maintaining the highest quality standards in every step of the manufacturing process and ensuring a highly competitive service in terms of technology and styling. Stamperia Pezzoli's finished textiles are used worldwide mainly for furniture and linen in households, hotels and hospitals. They are also used in the shipping industry and in the outdoor sector.
Pezzoli relies on Mahlo technology for straight-thread fabrics as well as process control and quality control during the finishing processes on the stenter frame. In the installation shown, a combination of Orthopac weft straighteners at the inlet and outlet of the stenter frame ensures perfect straightening results. For the best printing results, the Patcontrol system also monitors the pattern repeat and pattern distortion. The parameters in the stenter frame - dwell time, exhaust air moisture, residual moisture, fabric width - are monitored by the Optipac process control system.
Images courtesy of Stamperia Pezzoli, Italy
Stenter frame with Orthopac weft straightener at the inlet and outlet. A Patcontrol PCS also scans pattern distortions. The Optipac process control controls the dwell time, exhaust air and residual moisture.
A Patcontrol PCS scans for pattern distortions at the inlet and sends control commands to the weft straightener.
At the inlet, the Orthopac RVMC automatic weft straightener supplies the stenter frame with straight fabric.
The Ortopac RVMC uses skew rollers and bow rollers to correct skew and bow distortions in the fabric.
Exhaust air humidity sensors in the Optipac VMC measure and control the exhaust air humidity in the stenter frame. Excess moisture escapes, leaving the energy required for drying or fixing.
Hidden in the stenter frame, Optipac VMC sensors measure the surface temperature of the fabric and control the dwell time / fixing time.
Sensors at the stenter frame outlet measure the residual moisture of the fabric and adjust the system if the value is too high or too low.
The Wilot WMR width measuring system from Mahlo records the fabric width as it passes through the stenter frame.
An Orthopac FMC logs the residual distortion values at the outlet of the stenter frame and sends control pulses to the straightening machine in the infeed if necessary.
The pattern distortion at the stenter frame outlet is also logged with the Patcontrol PCS and, if necessary, control pulses are sent to the straightening machine in the infeed.
Permaset VMT
Control of dwell time and fixing time
The pyrometer measures temperatures from 0 - 250°C
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Infrared pyrometer
To determine the dwell time or fixing time for a desired product temperature, the surface temperature of the product is measured without contact at several locations in the dryer using high-temperature resistant infrared pyrometers. Up 64 sensors are possible. The dryer speed is automatically adapted.
Product Highlights
- Non-contacting product temperature measurement
- High-temperature rated sensors
- Little assembly and maintenance effort
- Self-cleaning sensors
Customer benefits
- Highest repeatability
- Optimal utilisation of the stenter capacity
- Less energy required / yard goods
- Highest process reliability
- Short amortisation time
- Elimination of safety margins
Stenter control made easy
Without knowledge of what’s happening during a fixing, thermo-isolating, condensing or gelling process in the drying chambers, the stenter has to be looked at like a block box. The user had only his own experience to fall back on. Settings for circulation temperature and stenter speed have to be determined empirically. To ensure adequate process reliability most stenters are operated with large safety margins regarding possible speeds. They are therefore far away from optimal utilisation of machine capacity and energy invested.
In many processes knowledge of what happens in the stenter is not only an economic question. The achievable product quality also depends largely on the suitable temperature and dwell time.
With thermo-fixing of textiles with Lycra portions excessive product temperatures may, for example, cause the Lycra portion to loose elasticity. This would mean significant quality reduction.
To ensure repeatable processes, the use of appropriate measuring equipment in the drier chambers is essential.
| HP-270-0 | Standard version |
| HP-270-1 | With sensor extension and mounted control box |
| HP-270-2 | With mounting plate for the sensor |
| HP-270-3 | With sensor extension and remote control box |
