Sorry for the late reply.
hawsan the short reply would be no. PET cant be used as as effective dessoicant.
The long answer would be as following. For an effective dessicant it needs to hold (Absorb /Adsorb) a lot of moisture (Plus other factors too but lets keep it simple). The most commonly industrialy used dessicants for drying…[Read more]
Hi edwardmartinhill ,
Before I answer your question i want to say you have put in a lot of work. I know its really frustrating to put in so much effort and not get the results you hoped for. PET bottles are every where and people are really tempted to recycle them.
I will lay down some facts about PET any may be that helps. I dont want to d…[Read more]
I will try my best to answer your question. It may get too technical. I dont want to discourage anyone from recycling PET rather provide information that would help people focus their energy better.
In the picture your have shared has two preforms, one with a crystallized neck and one non crystallized neck. These are two d…[Read more]
I have been mostly following the precious plastic since a few years. The work that is being done is great. What i would now bring to everyones attention is that the largest plastic exhibition is going to be this year, called the K Show (aka K Trade, K Messe or just K 2019). This is so big that it can only be organised every 3rd…[Read more]
Hi, There are many European equipment manufactures but they would be really expensive if not used for a commercial purpose.
The following is a “SHORT” list of very good equipment manufacturers
Injection Molding machines (Starting from 200K €)
Nissi (…[Read more]
Molding such a big piece would be a challange on hand molding. I would suggest using the compression machine. See the link https://preciousplastic.com/en/videos/build/compression.html .
But to answer the question, here are a few calculations (Assuming all in SI units).
Part Size = 300mm x 20mm x 20mm
Thickness = 3mm
Part Volume = < …[Read more]
@polymeergermany , What I can imagine is that the part is sticking on the Male /Core side of the mold. There could be a few things you can check.
1. Do you have a draft angle on the core to help part ejection. Minimum 2° ~ 3° would help.
2. Your part may be shrinking too much on the core , making it hold on tight to the core. May be you are c…[Read more]
Hey @polymeergermany , If you can share some pictures then it might be more helpfull to identify.
If by sticking you mean sticking like glue then then may be your mold temperature is too high or the plastic has not fully cooled yet. Try putting the tool in water for a while and then remove the part. If nothign works then try this Mold release…[Read more]
Wellcome to the group. I am also from Pakistan but living in Germany for the past few years. I am following the Precious Plastic for some time.
You can find all the Videos, Drawings and Details on the link below ;
Hey @shaikat shrinkage of PP depends upon your process. PP has a shrinkage of 2 to 3% normally. I am guessing you are using an injection molding. In conventionally injection molding machine the holding phase compensate the shrinkage.
Hey fellas, i have recently join the precious plastic group and am really exited about it. I have been going along several threads and this one really caught my attention. I am hoping to build one my self one day. UNFORTUNATELY I dont have a workshop where I can build one BUT what I have and can offer is a lot of knowledge about Plastics…[Read more]
Hey @samgueterbock PET is not a forgiving material. Even in the industry that makes PET bottles , with all the high tech costly equipment, they have the problem of degradation.
Compression molding is a low process. Meaningin heats the material slowly and cools it down slowly.
It would be great if you could share more about your experiment to have…[Read more]
The simple answer would be yes BUT difficult.
WHY : PETE in orignal state (in this case relax state) is milky white. You can not see across a 2mm thick sheet. Once you melt the PETE and cool it you will have the milky white appearence.
However to make it clear again you would need to cool it very very rapidly. Eventually freezing the plastic. To…[Read more]
Hey @adrienluitot , The glue on those PET bottles is a Hot glue. Similar to the one used in the hot glue guns. And @tathata is right, hot caustic soda (NaOH) will get it off. But be very carefull with caustic.
To your question if its ok to leave it with the plastic, well it will just act as a contaminent. Plastic and glues dont mix well.
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