Creep – A Hidden Killer – How to Protect Your Designs…

New High Rate Pulverisor Technology…

What Data Sheets Tell You – the complete series written by Dr Nick Henwood and published by ARMO.  Publications include Introduction to Data Sheets, Material Density, Melt Flow Index, Tensile Strength, Flex, Impact Strength, Heat Deflection Temperature and ESCR

Rates of Cooling for PE Rotomoulded Grades – go to PAGE 3 of the ARMO NEWSLETTER

Critical Factors Affecting the use of Finite Element Analysis for Rotomolded PartsComputer aided engineering (CAE) technologies, such as finite element analysis (FEA) of stresses offers the capability to optimize and validate engineering designs within a virtual environment, enabling potential problems to be highlighted and development time to be decreased. see more

Accuracy of Tests:  The rotomolding industry commonly uses two connected tests to assess the quality of plastic powders: Dry Flow and Bulk Density.  Industry-specific recommended test methods are now available for both parameters see more

Behaviour of Powders:  The rotomoulding industry uses a simple but crude measure to assess the flowability of powders, which involves timing the discharge of powder through a funnel with a circular bottom orifice. see more

Studies of degradation effects during rotational molding:  This paper describes a program to assess degradation effects on polyethylene, the most common polymer used in rotomoulding.  see more

Removing the mystery from Rotomoulding:  New insights  into the pysiochemical processes involved leading to improved quality control.  see more

Developments in Polypropylene for Rotomolding:  The position of polypropylene (PP) as a material for rotational molding is reviewed and a general specification is proposed for a suitable rotomolding grade.  see more 

What happens during cooling:  A review of cooling in rotomoulding, with particular emphasis on the effects of variable cooling on the properties of polyethylene parts. see more

Adding value to rotational molding with color and special effects:  This paper reviews the different ways of adding color in rotational molding and provides technical and economic arguments for each method. The effects of pigment incorporation on base material properties are discussed and the importance of factors such as pigment type, pigment loading and method of mixing are examined in relation to material processing, physical properties and the aesthetics of the final rotomolded part. The use of special effects such as stone and antique look colors to give further value enhancement is discussed.

Topical Technical Tip:  Rates of cooling for polyethylene rotomoulding grades – go to PAGE 3 of the ARMO NEWSLETTER

Rotomoulding Materials – Challenges & Opportunities: a presentation given at the PDM Exhibition & Conference in May 2012 in London, UK.  Highlights issues around the relative lack of stiffness of polyethylene and possible enhancement of part stiffness using a foam layer.