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Old 03 January 2007, 16:31   #1
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Making Windscreens

Evenin` all. We have just aquired some polycarb sheet and would like to make a windscreen. I`ve been told that it needs "drying" first before its formed to get rid of bubbles? How critical is this, and does it need to be done? Thankyou for any expertise!
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Old 03 January 2007, 16:41   #2
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Windscreen

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Evenin` all. We have just aquired some polycarb sheet and would like to make a windscreen. I`ve been told that it needs "drying" first before its formed to get rid of bubbles? How critical is this, and does it need to be done? Thankyou for any expertise!

Yes, correct it does,check out Arla website Sweden for correct temps and timing for Drying,(something like 1 hour per mm@100 degC) as it is hygroscopic, meaning it absorbs moisture. You would be better using PETG which is equally as good, approx 80% of PC strength, easier to work with as well, and does not require drying.
Try Barkston Plastics in Leeds 0113-2492222, Steve Rock
Hope this helps

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Old 03 January 2007, 16:55   #3
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oooooooo.... Inde your so good
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Old 03 January 2007, 17:02   #4
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Thanks Inde boy, this stuff i got is called Plazcarb, 6mm thick, so i take it the cooking time is 6hours @100c. If we didnt do this, will it affect the see-thru properties that much?
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Old 03 January 2007, 17:35   #5
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Unless the curves in the screen are gentle enough they can be done cold.
http://www.sheffieldplastics.com/web...EF_MAK_FAB.pdf
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Old 04 January 2007, 01:38   #6
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Phew what a read! Thanks Madmat, we`ll just have to have a go with the scrap first. Will take pics to let you know how we get on.
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Old 05 January 2007, 15:57   #7
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windscreen

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Phew what a read! Thanks Madmat, we`ll just have to have a go with the scrap first. Will take pics to let you know how we get on.
I was involved in making some screens for lambretta scooters recently using acrylic, nice shapes, what is called press forming, we heat sheet under a sheet heater, and press with tooling, if you ever see a helicopter pilots screen cover ( black) on helmet we make them as well, as you probably guessed I work with plastics, vacforming,press forming any probs or help required contact me.

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Old 05 January 2007, 15:59   #8
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Yeh Yeh I know

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oooooooo.... Inde your so good
Plasman at your service, hey what happened to the 20 mm HDPE sheet for transom modification??????



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Old 05 January 2007, 16:03   #9
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drying

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Thanks Inde boy, this stuff i got is called Plazcarb, 6mm thick, so i take it the cooking time is 6hours @100c. If we didnt do this, will it affect the see-thru properties that much?

drying is at @120deg, checked out info today, go for PETG
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Old 11 January 2007, 11:33   #10
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All done! Managed to cold form in the end. Used button head allen key bolts and then finished off with motorbike trim. Am chuffed with the result! Thanks all for the pearls of wisdom, very helpful.
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