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Find a solution for PET waste (V4)

This topic contains 3 replies, has 4 voices, and was last updated by  George 2 years ago.

kai kaiyi

Find a solution for PET waste (V4)

08/10/2018 at 17:45

Hello everyone, this is Kai from Taiwan  will be working on solution for PET.

Sheet Extruding:
Fibre extrusion one of the common method in the market now; possibly for textile
Blow molding: one of the common method in the market now. somehow seems pointless to make them into bottles.

3 options we have now, sheet press seems like a good shot now
Sheet Pressing

fibre extruding

PP style
currently not too sure if PP machines would be suitable for since PET is more tricky and toxic. dioxin-like compounds seem very dangerous. any thoughts on how PET would behave on each machine?

rope making:
a 6 meter yarn machine made from wheels of toy  and bicycle tires. works fine just much could be improved. sometimes PET strings snap easily when it’s not cut evenly or the weight of machine creates too much tension on the end. any way to make this more efficient and better detail ? any thought would be helpful.

Possible Product:
could be fun to turn PET into something functional that’s more common in daily life. something huge and random as a reminder.

cloth Hanger:
100 years we own 10 pieces of clothing in lifetime, and yet nowadays we throw away ten pieces aways every year. a good place to think about how many we need.

PET seems to air proved well. should be water proved as well. a PET boat in Netherland sounds like a plan. but not the cheap one they glue all the bottles together; maybe one that’s properly melted.

Tooth brush
Radom object (could be used for street art)

interesting usage of PET bottle
liter of light (http://www.literoflightusa.org/)

bottle coin idea:
a project started with some friends in Taiwan; is a good reason to go around different beachs on the island and collecting PET bottles during summer.

here’s how it works. whoever joins this joint venture would get discount from the store by bringing clean washed PET bottles to the stores(surfer or diving spot for example). Shop could gain more traffic to them and better public image by doing so. it’s really helpful when the bottle are separated properly. (PP for the caps, PET for the bottle and random stuff on the label )

If else, everything is done by hand at the moment. one by one by hand, cut the string of cap on the top  bottle ad remove label and rinse them. could really use some automation here. the ones from beach could get very interesting inside such as cigarette butts or fermentation inside.

before anything happens we need some clean sorted PET bottles. so lets get hands dirty now.

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23/10/2018 at 11:11

Hi guys ! Yann here, working with Kai on finding solution for PET bottle, and last week we worked more specifically on rope making.

First there is some parameters that are mandatory during the process :
– Keep equal tension in all fibers / yarns
– Equal rotation speed for all yarns
– Perfectly free rotation at the end of the rope
– Keep rotating all yarns while the strand start to appear but at lower speed
– Maintain reasonable pressure on the separator

Here are some parameters that have influences on the rope quality and that we had tested / will test :
– Bottle strip width and regularity
– Untouched strip or “pre-rotated” strip stabilised in this form with an air heater
– Flat bottle or grooved bottle (influence on regularity)
– Same bottle type or mixed bottle supply (influence on regularity)
– Fiber joining (knots, torsion…)
– Tension (at the end of the rope, by the rotation tour number…)
– Rope type : quantity of fibers per yarn, quantity of yarns per strand, quantity of strand per rope (currently making a 2 fibers per yard / 3 yarns per strand / single strand rope, a fiber is corresponding to one bottle strip).

Some conclusion have already been found :
– Pre-rotating and heating the strip makes it look smoother and gives it a better reaction to torsion : the strip resistance being more homogeneous.
– The smaller the strip are, the better the rope appearance and smoothness is.
– There is no need to pre-rotate small strip (up to 3mm), but it is mandatory for bigger one to maintain a good appearance and a proper torsion reaction during the making.
– It is also mandatory to pre-rotate irregular strips for the same torsion reaction (risk of breaking in weaker spot before obtaining the right torsion).
=> Therefore the best material for rope making would be strips as small as possible, supplied from the same ungrooved bottle type.

And eventually we will continue working on the following point :
– finding the best cutting method to obtain small and regulare strip + automatised process
– if possible this cutting method works also on disparate and grooved bottles
– finding a better connection method than knots
– when the process is mastered, experimenting on various fibers/yarns/strands quantity

25/11/2018 at 01:37

I’ve seen a russian guy on youtube working with lots of PET bottle cutters (Sergey Tron DIY, unfortunately removed channel).
He once used a heat gun on the cut PET wire to give it a round shape, similar to what a filament looks like.


Maybe if the strands are round, they become easier to fit in a rope …


I have another concern about PET wire making : how can I prepare a PET bottle to be easily cut by getting rid of all the ridges in it. As you know registered bottle models are full of details and therefore rarely found in a perfectly rounded shape.


Keep up the good work 🙂

25/11/2018 at 04:38

I have found that making a box covered with plastic or a box out of recycled plastic and making a lasagna of animal waste, dirt, and biodegradable garbage, plus common worms, makes for the greatest compost for any garden and this compost does not burn the plants. I use to help in the community gardens in Portland, Oregon and use to do those lasagnas out of garbage and worms in order to make the compost for the plants. I think is a good idead

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