Sheet Extrusion Lines

Your Partner in Extrusion Engineering. diamat Maschinenbau GmbH manufacture equipment and machines for processing, reprocessing and recycling of plastic materials. Additionally they also have a range of equipment supplying to the paper, textiles and furniture industries.

A main area of concentration has been in the manufacture of plastic extrusion equipment which produce both, foil and sheet to the highest quality. The diamat company are well known with machines of this type, manufacturing materials for furniture covering, thermoformed packaging, stationary articles and motor vehicle components etc.

In recent years they have been producing solutions for the increasing problem of plastic waste disposal. Machines are in use that will rework previously non recyclable polymer scrap.

All departments of diamat have over the years collected a wealth of experience. Nothing highlights this more than the range of roller presses which started over 40 years ago.

The construction of all units can be fast, exact and easily adjusted to meet the precise requirement of the comstomer. The special project engineers assess accurately the requirement and create the specification of the equipment after in-depth consultation with the client.

Ever since the company founder Mr.Friedrich Brümmer developed the PVC flat foil extrusion line and invented the principle of the roller press in 1950, the company has accumulated vast know-how to aid new developments.

Now with ist young dedicated team using the most up to date equipment, the diamat company is prepared for the challenges of mechanical engineering of the future.

Extrusion

Extruder - Plastification Units

The Screw

only one design possible from physical side to fit exactly the requirements of one certain polymer
the screw can be made tolerant to process a wide range of different polymers raising the diamater, reducing the speed and flaten the compression zone
a grooved sleeve system, slightly changeable, increases the output rate
degassing can be provided or provissionally be installed to add degassing system in the future

The Main Drive

drive dedicates quasi the melt energy
is designed according to required melting energy
belt drive from motor to gear box gives quick, flexible and optimal adjustment to the different polymers while changing the transmission ratio
the technical better AC-motor is beyond 60 kW not longer economically usable - therefore is the DC-technic used from that point

The Control System

conventional construction with single controllers, conductors and relais is fair in price, quick and easy to learn and satisfies plenty of requirements
control system with central computer is feasible and offers advantage peculiarly for data gathering and processing
due to the pressure, extruder and gear pump are regulated to each other and ensure an optimal quiescent point

The Barrel Tempering

deviding the barrel into different heating zones along the barrel with ceramic heater bands and air cooling blowers
feeding zone is water cooled to set-up polymer entry to various conditions
practically, barrel heating only serves to pre-heat the machine and have constant control conditions - influence to melt properties is pretty narrow
barrel cooling widens the range of processable polymers and warrants a constant temperature control

The Melt Filter

we only offer in discontinuous version with 2 screen nests
hydraulic or manual operated
sufficient for plenty of requirements, fair in price and operation

The Melt Pump

main advantage: independent from back-prssure
equal output performance also on altering input pressure
product quality improved true and even
quickly amortized by definitely reduced scrap and adjustment times

The Tool

the melt cord is spread out with a "coat-hanger" distributor
the restriction bar is provided to coarse compensate the flow differences of the polymers
the sheet is fine tuned with help of the die lip and is adjusted according to the smoothing mode
width of th die is designed to the required gross width of the sheet
exit-width reduction is possible using the lateral covering application

Co-Extrusion

particular applications are the homogeneous inclusion of a regrind main layer within thin layers from new material, bringing up gloss layers and layers of antistatic, antiblock materials and/or additives for good printing as also for EVOH barrier layers
layers are lamiated over the main layer in laminar distributor
thickness distribution of the co-layers via slightly changeable profile plates
up to 7 layers

Downstream Equipments

The Smoothing Unit

3-rolls-unit, standard in vertical arrangement
two options existing, running with "rolling bank" or with air knife possible
completely adjustable in horizontal and vertical direction by means of inching keys to hit the best meeting point of the melt cord
deviation of the upper smoothing roll possible up to 45° backwards, therefore opportunity to extrude slantingly into the smoothing unit with help of an inclined die (for low viscous media e.g. PET)
smoothing slot of upper and lower roll exactly adjustable by means of fine reacting spindle gear
pneumatic docking and removing of the upper and lower roll
crossing of the upper roll possible, to compensate bending excited from strong closing forces
each roll tempered via separate temperature devices in a surface tolerance of ±1°C over the entire width
individual driven and speed adjustable by servo-motors

Winding and Storage

3 systems available, electro-mechanic, hydraulic and fully automatic turn winder
elektro-mechanic winder usable up to 1200 mm roll diameter, torque is controlled in the lane tension due to the diameter of the roll, winding change manually
hydraulic winder up to 2000 mm, torque control as mentioned above, maual winding change
turn winder is provided for quick automatic winding change after reaching set-up lane length or roll diameter
a storage system is necessary at fast take-off verlocities when running thinner sheet to have a commodate winding change
indication of the full roll can be realized acoustically, optically or over central control station

Running Two or Multiple Lanes

running two and more lanes is needed when the customer intends to process a considerable amount of thinner sheets and films to achieve the total output performance of the machine (there is a physical limit in speed of the take-off system at about 22 m/min)
lanes are center slitted and winded separatly
die and take-off system widened accordingly

General Information

all components (motors, gears, additional devices) exclusiv manufactured in Germany
screw and barrel outside manufactured due to diamat design
long term experience building sheet extrusion lines
only skilled personnel
only a few aimed addressable partners and technicians for the customer to give short ways of communication, quick and flexible reaction, well after sale care
huge treasure of engineering experience from building also special machines on other fields