With using injection moulding presses and high-performance materials, plastic injection moulder has the ability to produce a wide variety of quality custom parts. Just as all materials are special, these advanced machines offer different abilities and functionality options according to pressure size and type.
plastic injection moulding presses to make sure best quality and value, it’s important to partner with a manufacturer who can provide the correct size press for your particular needs.
How Are Plastic Injection Molding Presses Rated?
A professional plastic injection moulder can help you select the right sized machine for your project, and will have the capacity to offer you with a precise size estimate correct from the start according to a few key items of information.
Plastic injection moulding presses are rated, or typed, based on tonnage, which means how much clamping pressure a specific machine can provide. Press tonnage, or force, can range from lower than 5 tons to over 4,000 tons. The bigger a machines tonnage is rated, the larger it is.
Many plastic injection moulders provide a listing of moulding equipment used in their companies on their websites, together with each machines’ tonnage abilities.
How Much Clamping Force Do I Need?
Pressure maintains a mould closed during the injection process; too high or too little can compromise quality and bring about flashing– the appearance of extra material on the part edge. To determine the suitable size press for your application, consider the following key variables:
Press rating– A machine with a 50 tons rating, for example, will be able to deliver 50 tons of clamping pressure, or force.
Material choice and MFI– The melt flow index (MFI) of plastic, or melt flow rate (MFR), means the ease of flow of a molten plastic material. A high MFI will need more pressure than a low MFI.
Size– The size of the part will normally influence the size of the machine needed. Many computations include platen size along with mould and part size.
Safety factor– A mathematical percentage included into size calculations to help avoid defects in the end part, the safety element acts as a buffer; some specialists recommend adding 10% to the total press size estimate.
For most projects, we suggest calculating needed machine size using 2.5 times the surface square inches of the part and adding the 10% safety factor. For example, a part with 40 square inches would need a press size with 105 tons of pressure. If you add 10% for a safety element, you will need to use a press with a minimum of 115 tons of clamping pressure. A press size of 120 tons would be capable to accommodate this plastic injection moulded product.
Partnering With a Plastic Injection Moulder
Once you have an accurate press size estimate, you can start searching for a manufacturer; normally, moulders with a range of pressure sizes at their disposition will be capable to fit a width range of project demands. And if your project doesn’t have a finished mould from the beginning, it’s best to deal with a company that excels at injection moulding design and building a mould based upon correct specifications; this will help ensure effective, seamless procedures and safe contact among all additional and internal employee.