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Buss Kneader excels for PVC and cable compounding
Equipment
News
Leistritz increases extruder performance German company Leistritz Extrusion Technology has introduced new high performance twin screw extruders in its ZSE series. A new drive unit has been fitted to ZSE - HP machines, with screw diameters between 27-87 mm, which allows revolution speeds of up to 1,200 rpm, explains the company. A fully adjustable gear box means that the extruder can be adapted to a wide variety of tasks and throughput rates.
The company has also developed its largest machine to date, the ZSE 87 GL-HP. Leistritz says that this machine is aimed at the producers of technical compounds, where flexibility, good handling and high throughput rates can increase productivity and efficiency. Leistritz's twin-screw extruders are fitted with heating cartridges for heating and cooling, with the company daiming that they are efficient, cost-effective and safe for this purpose.
The ZSE 50 GL-HP twin screw extruder,
Advex systems meet polyolefin process requirements The sophisticated needs of post reactor polyolefin processing are met by its Advex Systems, says equipment maker Farrel. The fully integrated Advex Systems are designed to provide powerful shearing and homogenizing of heat and shear sensitive resins and compounds with viscous and abra-
sive properties~ in the preparation of quality, uniform pellets. Four basic configurations, each consisting of a side discharge mixer, melt pump and underwater pelletizer, are said to be designed to meet the capacity and processing conditions for current reactor technologies. Farrel adds that the Advex
Systems facilitate accurate process control of mix and melt temperature and pressurization for superior filtering and pelletizing, while accurately maintaining the theological properties of the polymer materials. The four configurations are the S System single stage mixer for the production of polyethylene
and other commodity polymers; the P System two-stage mixer for polypropylene; the L System two-stage mixer for bimodal and metallocene polymers; and the D System two-stage mixer for the production of polymer alloys and blends, and other types of resins that require longer residence times.
Buss Kneader excels for PVC and cable compounding The Modular Kneader System (MKS) is ideal for compounding PVC and cable compounds, claims Swiss company Buss Compounding. Large discharge extruders, along with wet-cut and underwater pelletizing systems, can be employed that "allowincreased throughput rates that can be used for both temperature- and shear-sensitive compounds, including highly filled products such as flame retardant compounds and semi-conductive mixtures. For compounding PVC or polypropylene for calender feeding, the mixing effectiveness of the Buss Kneader means that it is possible to feed individual components without premixing the formula ingredients.
The Buss Kneader employs reciprocating screw mixing technology to achieve its high mixing capacity. The screw in a Buss Kneader continuously rotates and reciprocates. There is one full stroke for every revolution. The wall of the barrel has three rows of teeth or pins that are located at 120 ° intervals around the circumference of the barrel and protrude into the barrel cavity. The flights of the screw are interrupted at concurrent points around the screw's circumference. The teeth and the interrupted flights, when combined with the rotation and stroke of the screw shaft, interact to provide the Buss Kneader with an unique operating principle, says the company.
The modular concept allows machines to be configured for specific requirements. Barrel, screw, temperature control system, drive, feed and discharge systems can all be varied, allowing higher screw speeds, if required. Buss says that com-
pared with previous versions higher throughput rates are now possible and the machine offers greater flexibility. Machines are available with diameters ranging from 30200ram, with the latest addition being a 55mm version.
PlasticsAdditives & Compounding April~May 1999
15
News
Leistritz increases extruder performance German company Leistritz Extrusion Technology has introduced new high performance twin screw extruders in its ZSE series. A new drive unit has been fitted to ZSE - HP machines, with screw diameters between 27-87 mm, which allows revolution speeds of up to 1,200 rpm, explains the company. A fully adjustable gear box means that the extruder can be adapted to a wide variety of tasks and throughput rates.
The company has also developed its largest machine to date, the ZSE 87 GL-HP. Leistritz says that this machine is aimed at the producers of technical compounds, where flexibility, good handling and high throughput rates can increase productivity and efficiency. Leistritz's twin-screw extruders are fitted with heating cartridges for heating and cooling, with the company daiming that they are efficient, cost-effective and safe for this purpose.
The ZSE 50 GL-HP twin screw extruder,
Advex systems meet polyolefin process requirements The sophisticated needs of post reactor polyolefin processing are met by its Advex Systems, says equipment maker Farrel. The fully integrated Advex Systems are designed to provide powerful shearing and homogenizing of heat and shear sensitive resins and compounds with viscous and abra-
sive properties~ in the preparation of quality, uniform pellets. Four basic configurations, each consisting of a side discharge mixer, melt pump and underwater pelletizer, are said to be designed to meet the capacity and processing conditions for current reactor technologies. Farrel adds that the Advex
Systems facilitate accurate process control of mix and melt temperature and pressurization for superior filtering and pelletizing, while accurately maintaining the theological properties of the polymer materials. The four configurations are the S System single stage mixer for the production of polyethylene
and other commodity polymers; the P System two-stage mixer for polypropylene; the L System two-stage mixer for bimodal and metallocene polymers; and the D System two-stage mixer for the production of polymer alloys and blends, and other types of resins that require longer residence times.
Buss Kneader excels for PVC and cable compounding The Modular Kneader System (MKS) is ideal for compounding PVC and cable compounds, claims Swiss company Buss Compounding. Large discharge extruders, along with wet-cut and underwater pelletizing systems, can be employed that "allowincreased throughput rates that can be used for both temperature- and shear-sensitive compounds, including highly filled products such as flame retardant compounds and semi-conductive mixtures. For compounding PVC or polypropylene for calender feeding, the mixing effectiveness of the Buss Kneader means that it is possible to feed individual components without premixing the formula ingredients.
The Buss Kneader employs reciprocating screw mixing technology to achieve its high mixing capacity. The screw in a Buss Kneader continuously rotates and reciprocates. There is one full stroke for every revolution. The wall of the barrel has three rows of teeth or pins that are located at 120 ° intervals around the circumference of the barrel and protrude into the barrel cavity. The flights of the screw are interrupted at concurrent points around the screw's circumference. The teeth and the interrupted flights, when combined with the rotation and stroke of the screw shaft, interact to provide the Buss Kneader with an unique operating principle, says the company.
The modular concept allows machines to be configured for specific requirements. Barrel, screw, temperature control system, drive, feed and discharge systems can all be varied, allowing higher screw speeds, if required. Buss says that com-
pared with previous versions higher throughput rates are now possible and the machine offers greater flexibility. Machines are available with diameters ranging from 30200ram, with the latest addition being a 55mm version.
PlasticsAdditives & Compounding April~May 1999
15