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Topic Tag: cut

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Hello dear recycle heroes,   Here is Magdalena from POLYMEER, we are a small recycling project with a compression machine in Kiel, Germany (https://www.facebook.com/polymeer.official/). We now want to produce the first products, in our case flower pots. Unfortunately, all this is a little more difficult than expected, because we don't get the product out of the mold easily. After we greased the mold with a mold release wax several times, heat and press the granules in the form and finally quench the hot shape with cold water, we always get big problems when we want to release the product out of the iron mold. We work with LDPE, which unfortunately is much more difficult here than PS, for example. With knives we always try to release the mold from the product, but this always leaves traces on the product and also our iron mold carries scratches from it. Even if we use only a little bit of granules, the product "sticks" so tightly to the iron that it takes forever for us to get it resolved and remove the product from the mold. Does any of you know the problem with the compression process and how do you deal with it? Which mold release do you use? Another thing that causes us problems and where we may be able to draw on your help and experience is smoothing the edges. When we have finally managed to release the flower pot from the mold, we usually see that the granules have spread slightly unequally, so that one wall is a few centimeters lower, for example, than another. That can also look quite nice, but we would rather find a suitable solution to shorten all sides to the same height. We have already tried a hot wire, but this warps the shape of the product, with a cutter knife one does not get far, because the wall thickness is 0.8 cm and the circular saw does a good job, but there is only one which we can use in a wood workshop. And we would rather avoid all the microplastics coming into the wooden container when vacuuming. Therefore, we are still urgently looking for a solution on how to cut the edges. What do you do in such a situation when the plastic is pressed too high up and you have to cut off parts? Do you have any experience or any tip that we should try? We would like to benefit from the community knowledge and are very happy about any response from you! Lots of greetings Magdalena von POLYMEER
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