technology | Machinery SHEET EXTRUSION
High speed sheet extruder for PP and HIPS packaging
Processing Technologies International (PTI) has developed a high-speed sheet extruder for polypropylene and high-impact polystyrene packaging.
The Super-G SGHS3000, which is available in two models, delivers high perfor- mance and overcomes the limitations of competitive products, says PTI.
The SGHS3000-36D has a 500hp motor and runs at a maximum speed of 1,000rpm, while the SGHS3000-42D has a 600hp motor and runs up to 1,200rpm. However, PTI says that each is capable of faster speeds, however – as it establishes the maximum rated speed based on an upper motor load threshold of 85%. For
COATING Co-extrusion on show at ICE
SML is to showcase its FlexPack co-extrusion coating and laminating line at the forthcoming ICE Europe exhibition.
The line is modular in
construction, and can be designed according to specific customer needs and to extrude a variety of raw materials. Starting from a basic configuration for simple extrusion coating products, it can be equipped with additional features – in- cluding a primer coating station, tandem configuration and ozone treatment to supplementary unwinds.
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processing PP, the SGHS3000- 36D has a production output of around 3,000lb/hr (1,361kg/h), says the company. “This sets a new industry
standard because of its innova- tive and unique design and performance,” said Dana Hanson, president of PTI. He said that the technology
offered high-speed production with improved melt quality – thanks to its Lobe screw technology that is integrated into all of its G-Series configurable roll stand configurations. As well as delivering high melt quality, the extruders feature carbide-lined barrels and Colmonoy hard-faced feed screws – rather than the case-hardened screws featured
on competitive models. The extruders boast an
oversized feed section which promotes higher regrind feed rates (up to 70%) along with a streamlined feed hopper with support, delivery chute, and tramp metal protection. Other key features
include: feed screw removal out-the-back of the unit; an easy-cleanout vent chamber; and linear bearing barrel glide support (patent pending). Special air-cooled heater and blower assem- blies limit the exterior heater temperature for safety and efficiency purposes (< 110°F) compared to competitive models – which can be as high as 500° F. ❙
www.ptiextruders.com
PROCESS CONTROL
Gas meter boosts foam products
Linde says that its gas metering equipment can help manufactur- ers of extruded foam products replace hydro- carbon foaming agents with carbon dioxide (CO2
) or nitrogen. Linde’s DSD
400 metering system and process is part of its Plastinum suite of products for the plastics industry. The equipment can be used for extruded polystyrene (XPS), polystyrene foam insulation board and other polyolefin foaming processes. Using inert gases provides
more consistent, eco-con- scious foaming, while also reducing the risk of fire hazards, according to the company.
The DSD 400 can provide
precise amounts of liquid CO2 or gaseous N2
during
extrusion, to help optimise foaming and reduce density. In addition, its ability to react quickly to pressure fluctua- tions at the extruder allows for a stable extrusion process and delivers consistent foam structures.
The DSD 400 inert gas In addition, the ‘Double-
Coat’ process – for which a patent is pending – can be integrated into a standard FlexPack coating line to create new opportunities in breath- able products. DoubleCoat
FILM & SHEET EXTRUSION | March 2017
combines extrusion coating with hot melt lamination, so enables coating thickness minimisation, as well as enhanced product breatha- bility. ❙
www.sml.at
metering device handles pressures up to 5,081psi (400
bar) and can pump liquid CO2 through the control valve at a constant rate at speeds up to 66lb/hr (30kg/hr). ❙
www.lindeplastics.com
www.filmandsheet.com
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