Mistakes To Avoid When Buying Used Plastic Injection Molding Machines

If you are planning to start a plastic manufacturing company, one of the primary things you will need to purchase is an injection molding machine. Also referred to as an injection molder, this machine will help you manufacture plastic products easily using a process known as the injection molding process. If you are low on budget, buying a new injection molder can be quite expensive. The good news is that there are used plastic injection molding machines that can do a good job just as new ones provided that you choose them properly.

For you to be able to choose the right used plastic injection molding machines, there are various mistakes you will need to avoid. The first mistake is buying injection molders that do not work. The key to purchasing a reliable used injection molder is to find one that is fully inspected and tested before being delivered to you. If you make the mistake of buying a used machine that is not functional, you will suffer loss of production as a result of multiple breakdowns. So make sure that the used injection molder you want to purchase is thoroughly tested before being delivered to your company even if the seller promises that it is in good working condition.

Another mistake you should avoid when buying used plastic injection molding machines is selecting large screw diameters. Such screws can lead to quality problems due to material degradation. When they are used with small shot sizes, the plastic material is forced to spend more time being heated by the barrel heaters. Material degradation will most likely occur if you use shot sizes that are smaller compared to the maximum shot capacity of the injection unit especially for heat sensitive materials. Large screw diameters are also notorious for creating large shearing forces during screw rotation, something that can in turn degrade the material and lead to reject parts.

You should also avoid the mistake of purchasing an injection molder that uses general purpose screws. Even though these screws can be very advantageous when used with most plastic materials such as PE, PP, PET, PC and nylon because of their flexibility, they are not good for materials. They can lead to lower part quality and productivity rates compared to more advanced screw designs like the barrier screw.

It will also be a huge mistake to buy used plastic injection molding machines that have limited injection pressure. If you want to be able to make quality parts consistently, you need to make sure that the molding process is not limited by the injection pressure. You need to have at least ten percent injection pressure in reserve so as to allow the injection molder to automatically adjust to normal variation in the plastic material viscosity. When the injection pressure is insufficient, the moldings that will be produced can be shorter or defective.

For more tips on how to purchase used plastic injection molding machines, visit our website at http://www.premierplasticsnj.com/