Posts: 8
From:
Registered: Oct 2003

posted November 15, 2004 02:25 PM               

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Has anyone had success running rigid with flex pvc thru water and get a proper bond while increasing line speed substantially ?

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Posts: 8
From:ON Canada
Registered: Oct 2004

posted November 16, 2004 08:15 AM               

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Do you mean coextrusion? I do run my coextrusion profile (rigid PVC & flexible PVC) through the water tank. It works very well.

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Posts: 8
From:
Registered: Oct 2003

posted November 16, 2004 08:25 AM               

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Yes Coextrusion. We want to try running the rigid pvc with a flex hinge on it thru the water at an increased linespeed. What I was worried about is if the bond will be affected due to the sudden shock hitting the water. The flex hinge has to bond pretty good to prevent separation from the rigis. Hope this helps.

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Posts: 8
From:ON Canada
Registered: Oct 2004

posted November 16, 2004 10:24 AM               

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If it was from the coextrusion die, I can not see any problem with the adhensive. If it was extruded from two dies, then laminated, it shouldnot have a big problem. How fast do you want to run? Which kind of profile you are running on which type of extruder?

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Posts: 8
From:
Registered: Oct 2003

posted November 16, 2004 10:37 AM               

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The coextrusion is running from a single die. It's running on a single screw
2 1/2"dia. 24:1 ratio air cooled barrel around 6fpm now to air table. RIgid profile is nothing funky but the flex hinge has to bond 2 profiles of rigid together and hold to a specified strength test. There are also numerous flex projections on the part which must remain at proper angles to rigid and good adhesion as well. They are hoping to push it out faster like (15-20 fpm) into the water. My main concern was if the faster speed will affect the adhesion strength of the flex to the rigin when it is shocked hitting the water.
Thanks for the input Lily.

Ps. check your mail.

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Posts: 5
From:CANADA
Registered: Oct 2004

posted November 20, 2004 10:34 AM               

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I am not quite sure about yours. We use water cooling system at 1800 ft/hr without any problem (We do not have lab shear test, just operators tear the flexible part by hand to see it would come off.) I don't know if it will help.

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