Archive for September, 2010

Window Frames

September 20, 2010

Most residential window frames were constructed of wood pre WWII and for a decade or so thereafter.    When double glazed windows became popular in the 1960’s, so did the use of the extruded aluminum frame.  Aluminum extrudes nicely into various sizes and shapes for frames for a variety of window configurations.  Also, aluminum frames provide a low cost, durable product which has excellent sound-proofing qualities.  Albarrie is proud to supply the aluminum extruders with high temperature handling felts which assist with keeping the surface finish of the window frames looking good.

On the downside aluminum frames are thermal conductors, and that is why you sometimes see frost on the inside of a window.    The better quality newer aluminum framed windows now have a thermal break to separate the interior and exterior surfaces of the window so this thermal conduction issue is resolved.

In the 1980’s the PVC (polyvinyl chloride), vinyl window frame became more popular and the sales of residential aluminum framed windows gradually decreased.  Vinyl also offers low cost and easy maintenance similar to aluminum.   However, on the downside it is constructed of  PVC which is not environmentally friendly or recyclable which both aluminum and wood are.   Also, PVC  is not as favorable for sound-proofing as aluminum.

There are other choices for window frames such as steel, fiberglass or composites, but these are more expensive and used primarily for commercial, industrial and architectural applications. As far as residential window frames, with our great push for green products; I would not be surprised to see aluminum window frames regain their former popularity.

With 30% of North American aluminum extrusion relating to the window industry, the Aluminum Extruders Council (AEC) found it important enough to launch a campaign in 2002 to “Keep Aluminum Windows (KAW)” .  This campaign relates to residential as well as commercial use. Details regarding this campaign can be viewed at www.aec.org under “Extrusion Applications”.

– Sue Johnson
Albarrie Head Office

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Merits of a Driven Extrusion Roller

September 13, 2010

The extrusion roller has been in use for some time now, replacing older systems such as flight conveyor or graphite tables. The advantage of a roller is its ability to turn when the aluminum is being push or pulled across the surface. The only problem with a roller is that the surface may flatten out over time, thus prevent the roller to turn, or the bearings have seized due to various conditions that can exist with the operation.
The driven roller then can be a huge plus because of the following points.

1) Positive rotation of the roller at all times
2) Rollers can be stop so that the extrusion can be moved onto the batching belts easily.
3) Helps prevent the surface from decomposing when the hot extrusions are in contact with surface.
4) Indexing for transfer arms can be easily done when the rollers have been stopped.
5) Speed of rollers can be matched to the press exit linear footage speed.

Choosing this option for the run out table of your extrusion press along with Kevlar or PBO rollers over graphite can help produce a better quality aluminum product and help reduce scrap and along with downtime and runtime. Therefore your yield out of each ingot will increase. Contact us at extrusion@albarrie.com for any questions.

Prepared by Neil Chappell
Albarrie head office – Barrie, Ontario

Albarrie Welded Spacer Bar Covers

September 7, 2010

For most aluminum extruders, the use of covers for the protection of extruded shapes in ageing ovens is a necessity. Especially for extruders that powder coat or anodize, a temperature resistant sleeve that is soft enough to protect a delicate finish but tough enough to resist wear and tear is a must.

Albarrie offers spacer bar cover in two styles of construction; sewn seam and welded seam. The sewn sleeve is traditionally constructed using a matching, high temperature thread. The welded construction is the method that generates the most questions and skepticism because it is not a process that is well known outside of the nonwovens industry. The welding of nonwoven fabrics is a tried and true method of high strength bonding. It is a process that has been used for critical applications such as the filtration, geotextile and medical industries. It is from our expertise in industries such as these that we are able to draw from our experiences and offer advanced products and processes for the extrusion industry. Albarrie has thousands of welded spacer bar sleeves in service all over North America and we have found that the bond is at the very least equal to our stitched counterpart. They also have the added benefit lying flatter than the stitched sleeves.

Possibly the greatest benefit of welding is the savings that we are able to pass along to our customers. Without the additional cost of thread we are able to offer our welded sleeves at a lower cost than our sewn sleeves and therefore improve extruders’ bottom line. The combination of our own needle felt using staple fibers and our welding technology, we make it possible to put a premium product in our customers’ hands (and ageing ovens). As important as the seam technology is, the actual material used in our covers is where the rubber meets the road. We use only our own material needled in our Barrie, Ontario facility, manufactured from the best staple fibers the world has to offer. In this case we use 100% Nomex manufactured by the US based DuPont corporation. Every spacer bar’s material and seam is manufactured under our very noses by people who very much care about our product and reputation. If you would like to see this technology for yourself please contact us for a sample.