Rubber is used in various industrial branches for the production of many technical products, commodity- and consumer goods. The following • Rubber hoses • Cable coatings • Cable insulation • Vapour barriers • Construction sealants • Rubber profiles • Cellular / sponge rubber • Shoe soles • Technical rubber articles • Conveyor belts • Asphalt- and bitumen mixtures Rubber is offered in various forms and sizes, i.e. bales, sheets, fibers, chips or crumbs, whereby the most usual form is bales. For almost any type of processing it is necessary that the bales are size reduced into granules or powder....

For the size reduction of rubber bales, whether natural- or synthetic rubber, PALLMANN delivers the Ultra-Granulators™. type C. PALLMANN has designed special guillotine rotors, in open design, without a traversing shaft and with a high-momentum flywheel. This design allows a low friction and therewith temperature-gentle size reduction. In addition, a patented infeed chute with shuttle flaps guarantees a guided material feeding and a dosed material intake. The machine is easily accessible for quick and thorough cleaning as well as for knife exchange as the upper part of the housing can be hydraulically...

In cases were relatively simple types of rubber granulated from a standard bale size to granule particle sizes smaller than 10 mm. the granulating process can often be performed in one step. For different types of rubber however, a dusting agent must be added. The rubber bales are fed by hand or via conveyor belt into the PALLMANN Ultra-Granulator", series C and are directly granulated to the desired end size. The particle size is determined by the screen mesh size installed in the knife mill. A pneumatic aspiration system is installed downstream from the rubber granulator in order to discharge...

If the addition of a dusting agent such as talcum or zinc stearate is required, the dusting agent is injected directly into the cutting chamber via a dosing rotary airlock as well as a high pressure blower. Therefore, directly after the cut, the surfaces of the cut granules are dusted there- with preventing caking. Overdosed dusting agent is separated from the granules by means of dusting agent recovery and can be reused.

If standard rubber bales from relatively insen- sitive types of rubber are to be size reduced to particle sizes smaller than 4 mm. granulating systems operating on a two-step principle are A PALLMANN Ultra-Granulator™,series C with guillotine rotor is used for the precutting of the Downstream fine granulating is also performed on a PALLMANN knife mill, equipped with a guillotine rotor. The rubber bales are fed by hand or by means of a conveyor belt into the are cut to pieces smaller than 40 mm. An additional conveyor belt transports the rubber pieces to the downstream fine granulating system....

Dusting agent installation In cases were big bales of natural rubber are lo be size reduced with low throughput rates, a bale cutter, type PBS is used for the first step. The bale cutter cuts the big bales into slices before they can be granulated to final size in a second step. Dusting agent is necessary, however, only in step two.

Tailor Made Systems Besides the standard systems for the size re- duction of rubber bales, PALLMANN supplies individually designed preparation systems for any other type of application in the rubber PALLMANN Ultra-Granulators™, series C are used whether rolled sheets are to be size reduced or granules for rubber floor manufac- By using different feed systems such as con- veyor belts, live roller conveyors, vibratory feeders or draw-in roller systems, the feed material in a wide variety of forms and sizes PALLMANN Ultra-Granulators™, series C. Material storage bins, before and after size reduction,...

For the production of compounds for cable manufacturing, seals and other elastic parts as well as for bitumen and asphalt production rubber powders in a wide variety of particle PALLMANN offers various grinding machines and systems in order to achieve the necessary material qualities and end finenesses. Disc mills, type PKM and turbo mills, type PP are used. Turbpflners® type PLM and pin mills, type PPSTare used for special appli- Granule-shaped feed material is fed into the mill by means of suitable metering systems. A vacuum system, optimally suited for this application, draws the material...

PKM 300 with screening unit Screened coarse material is reentered into the mill in a closed loop, finished product is weighed into bags, in accordance with the customers' requirements, filled into containers or directly transported into the production process. Standard systems for installation on the pro- duction floor are available. Individual set-up, even in multi-level buildings is possible, de- pending on the local conditions. Technical Data Drive, main Motor kW

The PALLMANN Group of Companies The Pallmann Group of companies is the leading manufacturer for size reduction machines and systems for the plastic and recycling industry. Pallmann Maschinenfabrik develops and manufactures machines and complete systems according to customer requirements or as standard solutions for the preparation of almost any plastic as well as recycling products. In its headquarters in Zweibrucken, Pallmann operates one of the world's largest research and technology centers as well as a training- and service center. More than 130 different test machines are available for the...