Category Archives

I received this question yesterday… AS We are using Isoplast in a hot runner system. The press was shut down. When the sprue, manifold, and barrel heaters were turned on, the material started oozing as a white material covered in black specs. What would cause this behavior? My Response The material you are processing is a ETPU (engineering thermoplastic […]

As a response to an earlier blog, I received this follow-up question… KD Are there any additives on the market that help to lower melt flow index MFI of polypropylene? My Response There are many additives that can be used with Polypropylene… but it requires research, and significant testing, into the application. I wish I could just […]

I was just asked the question… Kevin We are making some products using a PC+PET blend. We are having issues with material feeding / screw slip and screw stall. Do you have any idea what the exact issue may be? My Response Since you are processing a blend of two materials, the melting characteristics of […]

I was just asked this question… Jason How can I determine the proper size chiller to cool my parts efficiently?  My Response To determine the correct size chiller you must first calculate the cooling time, total amount of heat to be removed, the cooling power, the cooling power per line, and the required volumetric flow […]

Recently I have had many questions by phone, email, and Linked-In pertaining to mold filling for open-loop molding machines. As a result, I wish to clarify the basic difference between the optimal filling strategy for closed-loop molding machines vs. open-loop molding machines with respect to compensating for viscosity variations to maintain process consistency… 1st Stage Fill Closed-Loop […]