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.
Orthopac FMC-15
Distortion control system
The Orthopac FMC EP is a compact bridge only with optical scanning system. It fits in easily even under tight space conditions and can control external weft straighteners.
Orthopac FMC T: Standard bridge with optical scanning system and two guide rollers. The rollers provide straightforward web guiding.
Scanning principle by light-dark modulation using Fast Fourier Transformation
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Bow and skew detection and control
The Orthopac FMC automatic straightener is the heart and core of the Orthopac. The device consists of an optical scanning system and electronic control for distortion correction.
It is used primarily to detect and log residual distortions in the exit end of a system, e.g. with the stenter. Thread density can be determined at the same time. It can also be connected to external straightening machines then serving them as control unit.
Product Highlights
- Optimized optics ensure maximum possible resolution of the angle of distortion
- Direct, instantaneous signal processing determines the angle in a trice
- Optimized back and incident lighting
Customer benefits
- Broadest scanning spectrum on the market
- Simple, intuitive operation
- Automatic scanning even of the most complex product structures
Skewing of the product during manufacture alters the structure of textile webs. A distorted product depreciates in useful value, affects subsequent processing and invites complaints.
The integrated optical distortion detection Orthopac FMC is capable of handling the variety of usual colours, print and Jacquard patterns as well as surface structures such as pile and loop.
The scanning system detects and analyses the regular basic structure of the weft threads, courses or rows of tufting. If necessary, their density is determined at the same time.
For the control of various straightening devices, for pull-off rollers, chain differentials and multiple motor drives: The FMC distortion detection Orthopac constitutes the universal automatic straightening system. It can be installed upstream and downstream of a wide variety of production plants.
Equipped with digital scanning and state-ofthe-art processor technology, it adapts the control automatically to different textiles and displays distortion changes ergonomically and conveniently on the screen.
Sensors
