Plasti-Co® is an industry-leading plastic feed screw provider from general-purpose applications to unique specialty screws. Our wide selection and solutions includes injection molding and extrusion feed screws for your specific need. From low-shear designs, venting, mixing, up-sizing or down-sizing injection units , or whatever your specific processing requirements, Plasti-Co® can provide the feed screw solution you need.
Your specific applications and needs utilize different types of plastics, from general purpose resins to filled engineered resins, abrasive and/or corrosive, whatever the combination will determine which screw material is best for production. From general purpose to high wear or corrosion, by matching your feed screw material to the characteristics of the plastic, you can further your feed screw’s durability and function, increase longevity and minimize problems all while improving the quality and consistency of the final part product.
Some common materials used for molding machine feed screws include:
Alloy steels have very high yield strengths and low costs. However, they don’t offer much abrasion or corrosion resistance, so they often receive welded hard-surfacing and root treatments such as nitriding and chrome. Our alloy steel feed screw options include American Iron and Steel Institute (AISI) 4140, 4150 and 4340.
Stainless steel feed screws have good corrosion resistance and high yield strengths, with our 17-4PH and 51-5PH options sporting higher yield strengths than most alloy steels. However, wear resistance is poor, so many stainless steels are heat-treated or hard-faced welded to provide protection from corroded internal threads. We offer feed screws for molding machines in the 300 and 400 series, as well as the 17-4PH and 15-5PH options. Specialty steels such as Hastelloy C-276 and Duranickel are also available for extremely corrosive materials.
Once heat-treated, tool steel feed screws provide high abrasion resistance and better corrosion resistance than alloy steels but have a very low yield strength. Small screws are more affordable and a very good choice when abrasion and corrosion resistance is needed. On large screws, the cost of materials, heat-treating, and machining can make them quite costly, but should still be considered for specific applications. We carry injection molding feed screws with AISI S-7, D-2, M-2, H-13, CPM-9V and CPM-440V materials.
Every application is different, and we won’t recommend the same mixing screw for every job. Instead, we work with you to evaluate your unique needs and create a tailored solution.
Our P-3000 is a very versatile mixing screw with 18 different parameters that can be changed to effectively fit your needs, such as section lengths, channels and flight depths, to configure the screw for your application requirements. This mixing screw offers a wide range of versatility and can be used for tasks that require minimal to aggressive mixing or have shear-sensitive materials. The most common usage is color mixing injection molders, where it can offer low shear, high outputs, easy purging, high efficiency and several other benefits. The P-3000 is available in four different offerings based on your mixing application requirements, first-stage minimal, second-stage moderate, third-stage aggressive and fourth stage very aggressive.
From general-purpose screws, to feed screws with a variety of flight designs for specialty applications to boost output and quality and minimize scrap rates to extremely aggressive feed screw requirements, whatever your need, we can build feeds crews for you.
Plasti-Co®‘s years of engineering expertise allows us to provide superior components and services to you, our partners. We’ll work with you to find the right feed screw design for your injection molding or extrusion applications. Reach out to us at 800-521-0704 or through our contact form to reach our technical solutions team and provide you a quote today.
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