THERMOPLASTICS
Polyarylethe-retherketone
Polybutene-1 (PB-1)
Nylons (Polymides - PA)
Polycarbonate (PC)
Polyesters (Thermoplastic - PETP, PBT, PET)
Polyphenylene Sulphide (PPS)
Polypropylene (PP)
Polyvinyl Chloride (PVC)
Thermoplastic Elastomers (TPE, TPR)
Acrylonitrile Butadiene Styrene (ABS) and Other Specialist Styrenics
Aramids PI Aromatic Polyamide

See detail >>

Machine States for injection mold
In the course of troubleshooting it is very useful to break the machines cycle down into basic states so that we can quickly analyze the problem at hand and get our machines back on line. There are certainly dozens of individual steps that take place in any cycle but the purpose of this article is to compile those steps and break them down into 10 easily recognizable steps and a couple of auxiliary steps (that we will include for those running cores and insert jobs) that are basic to all molding equipment. This article is not meant to replace the owner’s manual of your machine. You will typically find a very thorough step by step description of both the hydraulic and electrical sequences that apply to that particular machine. Lets get started.

See detail >>

Injection Molding Cycle & Proces

The injection molding process occurs cyclically. Typical cycle times range from 10 to 100 seconds and are controlled by the cooling time of the thermoplastic or the currying time of the thermosetting plastic.The plastic resin in the form of pellets or powder is fed from the hopper and melted. In a reciprocating screw type injection molding machine, the screw rotates forward and fills the mold with melt, holds the melt under high pressure, and adds more melt to compensate for the contraction due to cooling and solidification of the polymer. This is called the hold time. Eventually the gate freezes, isolating the mold from the injection unit, the melt cools and solidifies. Next the screw begins to rotate and more melt is generated for the next shot. In the soak time the screw is stationary and the polymer melts by heat conduction from the barrel to the polymer. The solidified part is then ejected and the mold closes for the next shot.

See detail >>