materials feature | Window profiles
PolymaxTPE has developed a low hardness elastomer, which it says has better
performance than TPVs that
are widely used in weather seals
other Thermavic grades, it can be processed on conventional PVC extrusion lines. A gravimetric feeder is recommended for optimal dimensional tolerance of profiles, while high shear rates are needed – so twin-screw machines are preferred. The maximum recommended processing temperature is 185°C. At the same event, IQAP of Spain introduced its
range of cold masterbatches for PVC profiles and sidings. It says that the materials are based on ‘smart’ technology that reflects sunlight – especially infrared radiation –in order to minimise surface temperatures. It was tested for heat build-up (HBU), by exposure to a 250W heat lamp until thermal equilibrium is achieved. For medium coloured samples, the ‘cold’ masterbatch achieved a surface temperature reduction of 11-12°C; for dark coloured samples, the reduction was 37°C. “It allows manufacturers to extend the life of the
polymer matrix, and decrease heat stress on the material,” said Marta Ortiz, a PVC specialist at the company.
High impact Add-Chem has introduced its Add-Cam (CPE Acrylic Modifier) range of impact modifiers for rigid, opaque PVC in weatherable applications. It compliments Add-Chem’s existing acrylic impact modifiers (AIM) and chlorinated polyethylenes (CPE), blending both types to give what the supplier describes as an alternative cost effective system for extrusion and injection moulding processes suitable for applications as diverse as window profiles, pipes, sheet and cladding. “Being a blend of these two modifiers, the processing of CAM grades lie between the two conventional modifiers with some grades processing similarly to either AIM or CPE,” the company says. “The end user can choose the most appropriate modifier system for their needs.” AIM and CPE are blended at different levels to give grades with a range of properties and performance. The
Production boost
US-based Quaker Windows & Doors has opened a new production facility, two miles from its main manufacturing plant in Freeburg, Missouri. The 185,000 sq ft facility – which employs nearly 200 people – houses
the company’s entire vinyl window and door manufacturing division. Construction began in early 2015 and was completed earlier this year. The plant was built in order to meet growing demand for Quaker’s vinyl window and door products from across the country. Between them, the two plants produce 1500-2000 PVC, aluminium
and wood windows and doors every day, and employs more than 650 people.
26 PIPE & PROFILE EXTRUSION | September 2016
supplier highlights the ability the new range offers to optimise cost and to adjust the performance ratio, as well as providing high impact efficiency even at low temperatures, excellent corner weld strength in window applications, good surface appearance and high gloss, and weather resistance. The main physical and process- ing properties of the CAM range have been compared to standard AIM and CPE modifiers in a representative Ca-Zn stabilised white window formulation. This comparison was carried out with constant mixing and extrusion conditions apart from small adjustments required to extrusion haul-off speed to maintain constant wall thickness.
TPE for weather seals PolymaxTPE has developed a low hardness TPE elastomer which, it claims, has better performance than that of thermoplastic vulcanizate (TPV) widely used in weather seals. The new grade, D6940, is aimed at weather seal
applications that require low deformation stress, rubberlike seal recovery, UV resistance and paint stain resistance. With hardness reduced to 40 shore A, it still exhibits 12% higher tear strength than a weather seal grade TPV with 60 shore A while providing low compres- sion set of 14% at 23°C and 36% at 70°C. PolymaxTPE’s weather seal product line includes
materials with a hardness range of Shore A 40 to 90 and covers a broad spectrum of physical properties. According to Tom Castile, vice president of sales at
PolymaxTPE: “This new TPE achieves our goal of a higher tear strength elastomer with low compression set at hardness levels down to 40 Shore A.” The TPE grades are made at its new manufacturing locations in Chicago, USA and in Nantong, China.
Tooling boost UK-based window and door maker Synseal Extrusions
www.pipeandprofile.com
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