An Experimental Study of Rotational Molding of Polypropylene/Polyethylene Copolymers
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M. Kontopoulou
Abstract
The objectives of this work are to assess the rotomoldability of rubber toughened polypropylene resins and to investigate how resin properties can influence the process of rotational molding and the final part quality. Four commercially available polypropylene/polyethylene copolymers were tested. The chemical composition and the powder, rheological and thermal properties of the resins were determined. Rotational molding experiments were carried out in a laboratory scale uniaxial machine which is capable of measuring internal mold temperature and which facilitates the visual observation of various transitions in the cycle. Impact and environmental stress cracking resistance tests, as well as thickness distribution and density measurements were performed on the roto-molded parts. It was found that increasing rubber content results in an improvement of the impact properties which is counteracted by difficulties in processing, presence of bubbles and uneven surfaces.
© 1997, Carl Hanser Verlag, Munich
Artikel in diesem Heft
- Contents
- Contents
- Editorial
- Third in a Series: Pioneers of Polymer Processing: Charles Goodyear
- Screw Extrusion/Mixing
- Chaotic Features of Flow in Polymer Processing Equipment-Relevance to Distributive Mixing
- Influence of Design on Mixing Efficiency in a Variable Intermeshing Clearance Mixer
- Simulation of Non-Isothermal Flow in a Modular Buss Kneader and Comparison with Experiment
- Rheological Behaviour of LLDPE/LDPE Blends under Elongational Deformation
- Effect of Compounding Conditions on Mechanical Properties of Glass Fiber-Reinforced Polyamide-6
- Die Extrusion
- A New Approach to Simulation of Die Flow which Incorporates the Extruder and Rotating Screw Tips in the Analysis
- New Aspects Concerning the Design of Coathanger Dies
- Film
- On-Line Birefringence Measurement in Film Blowing of a Linear Low Density Polyethylene
- Brittle Melt Rupture Phenomena in Polymer Processing
- Moulding
- Injection Molding of LDPE/BaSO4 Blends
- An Experimental Study of Rotational Molding of Polypropylene/Polyethylene Copolymers
- Determination of the Inter-Relationships Between Processing Conditions and Properties of an Injection Molded Silicone Ring Using an Experimental Design
- Numerical Simulation of the Flow and Fiber Orientation in Reinforced Thermoplastic Injection Molded Products
- Wide-Angle X-Ray, Densitometric and Microscopical Studies on Injection Molded Polypropylene Disks
Artikel in diesem Heft
- Contents
- Contents
- Editorial
- Third in a Series: Pioneers of Polymer Processing: Charles Goodyear
- Screw Extrusion/Mixing
- Chaotic Features of Flow in Polymer Processing Equipment-Relevance to Distributive Mixing
- Influence of Design on Mixing Efficiency in a Variable Intermeshing Clearance Mixer
- Simulation of Non-Isothermal Flow in a Modular Buss Kneader and Comparison with Experiment
- Rheological Behaviour of LLDPE/LDPE Blends under Elongational Deformation
- Effect of Compounding Conditions on Mechanical Properties of Glass Fiber-Reinforced Polyamide-6
- Die Extrusion
- A New Approach to Simulation of Die Flow which Incorporates the Extruder and Rotating Screw Tips in the Analysis
- New Aspects Concerning the Design of Coathanger Dies
- Film
- On-Line Birefringence Measurement in Film Blowing of a Linear Low Density Polyethylene
- Brittle Melt Rupture Phenomena in Polymer Processing
- Moulding
- Injection Molding of LDPE/BaSO4 Blends
- An Experimental Study of Rotational Molding of Polypropylene/Polyethylene Copolymers
- Determination of the Inter-Relationships Between Processing Conditions and Properties of an Injection Molded Silicone Ring Using an Experimental Design
- Numerical Simulation of the Flow and Fiber Orientation in Reinforced Thermoplastic Injection Molded Products
- Wide-Angle X-Ray, Densitometric and Microscopical Studies on Injection Molded Polypropylene Disks
