On this website you will find information and products for extrusion lines.
Melt pumps (gear pumps, extruder pumps):
Swiss company eprotec manufactures high quality melt pumps for film and sheet extrusion as well as for compounding. These melt pumps are designed especially according the application. This is reason why these pumps are used also for demanding application like extrusion with fillers (even glass fibres, barium-sulfate, e.g.). Also in extrusion of plastics with very low viscosity an exact melt pump design is necessary. The melt pump (gear pump, extruder pump) is an important tool for constant extruder output. Meltpumps are installed after extruder and screenchanger and before a static mixer (if necessary), coextrusionsadapter (feedblock) and the extrusion-die.
Spare parts for melt-pumps:
eprotec offers also spare parts for melt-pumps from original different suppliers.
Thickness gauges, inline thickness measurement:
Austrian company SBI manufactures thickness gauges for film and sheet extrusion as well as retrofit-able automatic systems for extrusion-dies.
According application these thickness gauges are equipped with different sensor systems.
Thickness gauges SHADOW and KAPA are designed for sheet extrusion lines with rollstand. Thickness from about 50 micron up to some mm is the range where you can install these measurement systems. Typically for films of plastics such as PET, PP, PS, ABS, PA, PC ... and of course also for multilayer film)
Thickness gauge STG is installed in extrusion lines for thick sheets (ABS, HIPS, PS, PC, PMMA, HDPE, PP e.g.).
With SBI's thickness gauge KAPA IR it is possible to display the thickness profile of the barriere layer in a multilayer sheet. For example the thickness profile of an EVOH layer in a PP//EVOH//PP sheet. This is a tool to guarantee an even distribution of the barriere layer (here EVOH) in the barriere sheet.
All thickness gauges can be used extrusion of film and sheet with controlled thickness.
Thickness gauge are installed after the extruder (with screenchanger, melt pump, coextrusionadapter, flat die (extrusion die) and the rollstand or chill roll, in front of haul-off and winder.
Automatic systems for extrusion-dies:
SBI manufactures different automatic systems for extrusion dies. These systems can be installed at most of existing extrusion dies. To retrofit existing extrusion-dies is the most economic option to change for extrusion with controlled thickness. Many manufacturers of extrusion dies install SBI's thickness gauges for their "automatic extrusion dies". For example famous Taiwanese extrusion-die manufacturer GMA.
SBI offers from thickness measurement systems to automatic systems for extrusion-dies a complete package for sheet extrusion with controlled thickness from one hand.
GMA is an experienced extrusion-die manufacturer with own chrome-plating facility.
Founded 1989 and meanwhile one of the largest die manufacturer in the world with the whole design and manufacturing process in own hand. More than 120 employees manufacture about 300 extrusion-dies a year for international customers.
Key points for success are most modern flow simulation methods, state of the art tooling machines and own chrome-plating facility as well as a lot of experience in design for features around extrusion-dies like internal deckling, encapsulation and lip-adjustment.
Extrusion-dies with uniform melt-flow and die-exit are designed according rheologic data of involved polymers together with CAE simulation to design perfect pressure distribution in the flow-channels.
The confluence of different melts in coextrusion-adapters and multi-channel-dies are analysed with VFA (visual flow analyses) systems until it is perfectly matched. These is the prerequisite for multi-layer dies up to 9 layers with encapsulation.
In own chrome-plating facility all the bathes and electrodes are designed especially for best chrome-plating of extrusion-dies. Years of experience together with most modern equipment provides uniform chrome-thickness with smallest possible lip radii.
High precision grinding machines (some are installed in separate clean room) manufacture parts within tightest possible tolerances. Some of these tooling machines are such high accurate, that they must be equipped with GPS system to monitor their position of installation.
Production attendant quality controls for straightness and flatness, roughness, thickness of chrome plating, lip radius is comprehensive done and reported. These reports are part of delivery.
These is part of the prerequisites for manufacturing of extrusion dies for optical sheet, one of the core competences of GMA.
Extrusion dies for film and extrusion coating are equipped with internal and external deckling with edge bead reduction.
Automatic extrusion-dies are equipped with “thermal bolt” systems from Austrian manufacturer SBI.
Mainly used from extrusion-line manufacturers, GMA’s products are used world-wide. GMA starts to build its own sales force for Europe.
Electrostatic discharging, charging, web cleaning
Hildebrand Technology AG
Hildebrand (Division of Gema Switzerland, St. Gallen) manufactures systems for electrostatic discharging (neutralising), charging and web cleaning. These products are used in extrusion of plastics, manufacturing of fleece, e.g.