Working with PVC: 4 key Requirements for Screws and Plasticizing Barrels
When working with PVC, whether in injection molding or extrusion, screws and plasticizing barrels must have specific features to prevent material degradation and ensure efficient processing. Compared to other polymers, PVC requires special considerations due to its thermal sensitivity and tendency to release hydrochloric acid (HCl) during processing. Special requirements for screws and barrels used […]
The effects of additives on the productivity and efficiency of the plasticizing unit
Various types of additives are used in extrusion processes. The most important additive groups used include: Internal and external lubricants, nucleating agents, viscosity modifiers, heat stabilizers and antioxidants, impact modifiers, dyes and pigments, fillers, etc. The selection depends on the type of plastic used, the desired properties of the final product, and the specifications of […]
Preview 2025
The start of a new year is the right time to analyze what 2024 has been and what we intend to achieve in the new year. The past year has been an important one, during 2024 the prices of polymers used in the molding and extrusion of plastic materials have shown downward variations, influenced by […]
Viplas at GREENPLAST 2025, the fair of the circular future of plastic and rubber
GREENPLAST is the international exhibition-conference dedicated to materials, technologies and transformation processes of plastic and rubber, with a focus on sustainability, recovery, recycling and energy efficiency – which will take place from 27 to 30 May 2025 at Fiera Milano (Rho). The fair will present the most advanced solutions aimed at the circular economy and […]
Operational Effectiveness of Machines (OEE) and Spare Parts Management for Screws and Cylinders
Key Performance Indicators (KPIs) are key metrics used to measure the efficiency, productivity, and success of specific processes or activities.Important KPIs in industrial production include: Let’s take a closer look at the first indicator. Operational Effectiveness of Machines (OEE) The efficiency index of a machine, often referred to as operational effectiveness or efficiency, measures how […]
Cleaning of Screws and Cylinders
Cleaning the plasticizing screws and cylinders in extruders and injection molding machines is a fundamental operation to maintain production process efficiency, prevent material contamination, and ensure the quality of the final product. It is also essential for good preventive maintenance. The cases in which cleaning is needed are mainly two: At Viplas, we carry out […]
Extending the life of screws and cylinders: PVD coatings
Among the most common requests Viplas receives from customers is, unsurprisingly, how to extend the “lifespan of screws.” Like any mechanical part, the plasticizing screw (and barrel) is subject to wear. Additionally, depending on the type of polymers processed, the presence or absence of chemical or mineral additives, the pressures, and temperatures that develop inside […]
