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'[EE}:: Home made thermal welder for flexible plast'
2007\02\11@055541 by Russell McMahon

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Welder similar to commercial ones for sealing plastic bags etc.

Original ?Spanish? page

       http://www.newaysfactory.it/Termosaldatrice.htm

About as hard (for me) to read "translated page"

       http://translate.google.com/translate?u=http%3A%2F%2Fhttp://www.newaysfactory.it%2FTermosaldatrice.htm&langpair=it%7Cen&hl=it&ie=UTF-8&oe=UTF-8&prev=%2Flanguage_tools

Makes one painfully aware how far translators have yet to go to be
really useful.


__________


I want to build something which will seal plastic of any arbitrary
length, which requires sliding the plastic and welding head relative
to each other, unlike this design. I know somebody who has already
done this so will probably investigate his design in due course, but
if anyone here has ideas for a continuous line plastic welder I'd be
pleased to hear them.

My requirement is to take plastic sheet, probably polyethylene,
possibly layered with other plastics, say 1.2 or 2.4 meter wide, and
weld two sheets into a long tube. The tube would then be welded across
the end to make a large bag - probably in the order of 4m x 2m  or 4m
x 1m. Strength is not critical but gas tightness is highly desirable
or crucial depending on the application.


       Russell


2007\02\11@070424 by Wouter van Ooijen

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> Welder similar to commercial ones for sealing plastic bags etc.

I once used a broad-tipped soldering iron for this purpose. Temperature
was brought down by either a series diode or a dimmer, I don't recall.
It was used to create a small hot-air balloon from plastic garbage bags.
Another guy in our group brought a tool that did the job much better: a
kind of small-wattage soldering iron with a tip like a small clothing
iron. That tool was used in the greenhouse where he lived, for sealing
the bags in which flowers were packed before transport.

Wouter van Ooijen

-- -------------------------------------------
Van Ooijen Technische Informatica: http://www.voti.nl
consultancy, development, PICmicro products
docent Hogeschool van Utrecht: http://www.voti.nl/hvu


2007\02\11@112507 by Recon

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Russell McMahon wrote:

>I want to build something which will seal plastic of any arbitrary
>length, which requires sliding the plastic and welding head relative
>to each other, unlike this design. I know somebody who has already
>done this so will probably investigate his design in due course, but
>if anyone here has ideas for a continuous line plastic welder I'd be
>pleased to hear them.
>
>My requirement is to take plastic sheet, probably polyethylene,
>possibly layered with other plastics, say 1.2 or 2.4 meter wide, and
>weld two sheets into a long tube. The tube would then be welded across
>the end to make a large bag - probably in the order of 4m x 2m  or 4m
>x 1m. Strength is not critical but gas tightness is highly desirable
>or crucial depending on the application.
>
>
>        Russell
>  
>

If you are only going to do a few, as we did, here is a "quick and
simple" way.
we used  a 1/4" thick by 3" diameter wheel. Tapered the circumference
down to 1/8". We mad a handle for it so it looked like  one of the  
wheel type pizza cutters.
Then it is just a matter of heating it to the right temperature and
rolling it at the right speed.

It is crude but it worked.

I f one was going to use it a lot, I can invision a big C frame with a
wheel above and below.
a heater element to  heat the wheels.
PIC design time.  A temp control and a speed control for the wheels.
They make a fiberglass type tape to put on the contact surface so the
plastic does not stick to heat element.

RECON

2007\02\12@140940 by Jeff Findley

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"Wouter van Ooijen" <spam_OUTwouterTakeThisOuTspamvoti.nl> wrote in message
news:01b001c74dd4$c2a9c560$0b00a8c0@PAARD...
> Another guy in our group brought a tool that did the job much better: a
> kind of small-wattage soldering iron with a tip like a small clothing
> iron. That tool was used in the greenhouse where he lived, for sealing
> the bags in which flowers were packed before transport.

I've seen this sort of tool in craft stores.

Jeff
--
   "They that can give up essential liberty to obtain a
    little temporary safety deserve neither liberty nor
    safety"
- B. Franklin, Bartlett's Familiar Quotations (1919)



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