Using the Injection machine

Shredded plastic enters the hopper and is heated and pressed through a long barrel into your mold. The output color is often unpredictable when mixing colors in the barrel, allowing for beautiful (and surprising) patterns that can add to your one-of-a-kind products.

Input & Output

Type: HDPE, LDPE, PP, PS

Output: 10-30 injections per hour depending on mould

Run & maintain

Startup

  1. Turn the machine on and set the temperature to 20° more than the desired temperature. Make sure the lever is at its lowest position.
  2. Wait for at least 20 minutes.
  3. Turn the temperature down and fill the barrel with the desired plastic.
  4. Wait another 15 minutes for the plastic to melt - the first batch of plastic is used to rinse the machine and to get rid of plastic from previous sessions.
  5. Press the first batch of plastic out of the machine.
  6. The machine is now ready for production!

Production

  1. The machine is now warm and ready to use with your moulds
  2. Fill the barrel with your chosen plastic.
  3. Press the lever in the barrel.
  4. Pull the lever up every 5 to 10 minutes and add more plastic.
  5. Wait at least 10 minutes.
  6. Now for the mould - unscrew the brass screw at the bottom.
  7. Screw in the mould (be quick or plastic will start to flow out!)
  8. Once the mould is secured to the machine pull the lever down as far as possible, don’t be scared to give it a lot of pressure, it can easily hold 100kg.
  9. Unscrew the mold from the machine, unless you have car-jack.
  10. Pull the lever up.
  11. Screw the brass screw in place.
  12. Fill the machine for a new product.
  13. Let the mould cool.
  14. Open the mould once it is cooled down.

Tip : Depending on the plastic type, you’ll need one or sometimes two people to pull down the lever. Before injecting into the mould, make sure the plastic in the barrel is completely melted in order to fill all areas of the mould. To achieve this, run the machine a few degrees higher than usual to ensure the plastic is fully molten.

Cooldown

  1. When you turn on the machine, empty the barrel completely - this makes it easier for the next person using the machine.
  2. Leave the machine with the lever all the way down.
  3. Turn the machine off.

Tips & Tricks while using

  1. The hotter the plastic the greater the sink marks on the final product.
  2. Clean the mould from plastic when still warm, it will be harder to clean later.
  3. Use mould release on the mould, it helps with release.
  4. Keep the barrel full of plastic at all times, adding a bit of plastic with each injection.
  5. When you are finished working with the injection machine, empty the plastic from the barrel.
  6. To create an efficient process it is advisable to run the machine for a few hours once it is on - don’t start and stop the machine too often as the process will be very inefficient.

Troubleshooting

  • If the plastic is clogging at the end of the barrel and doesn’t come out even when applying higher pressure, raise the temperature of the nozzle heater to fully melt the plastic and release the block.

The final product might get stuck to the mould making it hard to release, if this happens gently re-heat the mould to soften the plastic and help release.

Resources