Extrusion dies (flat dies) for film and sheet extrusion

GMA (Taichung, Taiwan) manufactures extrusion dies (flat dies) and coextrusion adapters for fim and sheet extrusion.

GMA manufactures with most modern tooling machines and own chrome-plating facility

Comprehensive knowledge of the properties and the process parameters in polymer-extrusion together with the rheologic data of the melt are necessary to analyse and correct the design of the flow-channel with simulations using a CAE software. These simulations are the key factor of design for high-quality extrusion-dies. In addition, relies GMA on the many years of experience of the engineers in design of co-extrusion adapters and multichannel extrusion-dies.

Besides excellent design steel quality and chrome plating is very important for the quality of extrusion dies. GMA manufactures the extrusion dies and feedblocks with European steel.

Video:

Why GMA?

GMA is one of the largest manufacturers of extrusion dies (flat-dies, slot dies) and co-extrusion adapters in the Western world, with more than 35 years of experience. In addition to state-of-the-art software for flow channel design and flow simulation, we draw on our staff’s wealth of experience and an extensive library of proven designs.

In-house chrome plating
High-quality chrome plating of extrusion dies can only be achieved using equipment specifically optimised for this task. As chrome plating is one of the final production steps, errors in this process often lead to long delivery delays – these are avoided by having our own chrome plating facility.

High-quality steel from Germany
High-quality tools can only be manufactured using high-quality tool steel; GMA sources its plastic mould steel from Germany.
In addition, dies made of Hastelloy are also manufactured, for processing special plastics.

Fully digitalised company
Not only is the design department, with its capabilities in duct design and flow simulation software, fully digitally networked, but so is the production department with all its machine tools. Production processes are optimised, potential machine failures are detected and manufacturing processes are automatically adjusted – an essential prerequisite for for on-time delivery.

2 automatic die systems from SBI (Austria)
Automatic dies, in conjunction with thickness gauges, are used for the precise control of the thickness profile of films and sheets.

Automatic system with ‘thermal bolts’
Heated/cooled bolts operate on the principle of thermal expansion.
Automatic system with electric motors
MCAD system: electric motors (each bolt driven individually and independently by a motor), very fast, very precise, large movement ranges – full gap adjustment possible (across the entire flexible range of the flex lip).
The position of each individual bolts is always known and can be stored; it is reproducible, and even (mostly unnecessary) manual intervention are noticed.
The thickness gauge only needs to transmit the actual values (it does not require its own control software).

High quality slot dies for liquid coating are manufactured in an air-conditioned clean room.

Excellent references

GMA’s entire expertise is also available for the overhaul, repair or upgrade of dies.

Tooling machines and chrome-plating

Most modern tooling machines in clean room are employed for producing high-end quality extrusion dies for glass clear sheet from PC, PMMA e.g. as well as dies for liquid coating.

The company's own hard chrome plating facility guarantees optimized operating procedures, ensuring professional chrome plating and the highest quality chrome coating.
Havin an chrome plating facility is essential for ensuring reasonable delivery times and adherence to them.

A chrome plating line optimized for extrusion dies with specially designed electrodes is necessary to ensure that the chrome quality meets the required high standards.

Inspection and reports

Comprehensive inspection during manufacturing process of extrusion dies
Straight-/Flatness	Roughness	chrome-plating	Lip radius

Quality reports are part of delivery of each extrusion dies.

Extrusion-dies for cast-film extrusion

Film-dies are offered also with internal deckling and automatic adjustment system (manufactured at SBI, Austria)

Automatic systems are offered either as "push only" or as "push/pull" execution.

Extrusion-dies for sheet-extrusion

GMA offers extrusion dies with a broad range of options and has specific know-how for optical sheet application.

Extrusion-die with fast lip-gap adjustment (single point adjustment)

Fast lip-gap adjustment enables operator to change lip opening quickly without standstill of extrusion line. Fast lip-gap adjustment is possible for a certain lip range, for larger ranges move-and exchangeable lower lips is the preferred method.

Please see leaflet:

Video:

Automatic flat dies

Automatic flat dies are offered either with thermal bolts or motor controlled (each bolt is controlled by a separate motor), produced by SBI Mechatronik (Austria). please see also automatic systems.

Extrusion-dies for extrusion coating and lamination

Breitschlitzdüse für Extrusionsbeschichtung

Lamination-dies from GMA with unique dual deckle system reduces neck-in and is adjustable by electric drive. Lip-gap of this extrusion-lamination-dies are from 0,6 – 1,2 mm for processing EAA / EVA / PE / PLA / PP / PS / Surlin up to 5000 mm in width.