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  1. StevenMorrow

    Best method for welding of large Polypropylene part

    Hi Pat and Chris, I have managed to find some quotes that were prepared last year for producing this mould (two EU and two Chinese). We are seeing if we can create something with a decent finish for less using welding techniques. I am also leaning towards a new mould but I like I said, I have...
  2. StevenMorrow

    Best method for welding of large Polypropylene part

    Hi Pat - I do agree that it will a challenge to achieve an accurate and strong weld. At this stage, I am trying to determine the most suitable method. Mike - we have already received quotations for a mould. Personally, I would prefer to use a purpose-built mould, but I have been given the task...
  3. StevenMorrow

    Best method for welding of large Polypropylene part

    Good day, I have been tasked with determining how best to make a shallow version of one of our existing products (injection moulded in UV-stabilised, impact modified PP, L x B = 1m by 1.2m). I think that the best way to do this would be to cut out the middle section and to then weld the top and...
  4. StevenMorrow

    Determining the COP (Coefficient of Performance) of a heat pump system

    tombmech - thanks for the reply. Sorry for taking a while to respond, but I did not have internet access for the weekend. I think I should clarify a few points about the installation: > I am based in Port Elizabeth, South Africa which is a subtropical coastal region. This means that the...
  5. StevenMorrow

    Determining the COP (Coefficient of Performance) of a heat pump system

    Hello engineers! [peace] I am investigating the factors affecting the COP value of a proposed heat pump system used to prepare air for use in an automotive spray booth. This is a very low lift application (typically taking the air from around 15 degrees up to the required 23.9) and thus, using...

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