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A Fundamental Experimental Study of the Mechanisms of Warpage and Shrinkage of Polyethylene in Rotational Molding
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C. H. Chen
Veröffentlicht/Copyright:
27. Mai 2013
Abstract
An off-line experimental simulation of cooling and warpage of rotationally molded parts is described. Slabs of polyethylene rotationally molded parts containing thermocouples and monitored by displacement transducers are placed on a metal surface representing a mold wall. This is cooled by varying methods such as simulated water showers, fan blown air, and natural convection cooling. Temperature profiles in the mold wall and through the polymer are determined as a function of time. The position of crystallization and the development of warpage are observed. Warpage is attributed to thermal quench stresses and release of the polymer from the mold surface.
Accepted: 1990-1-22
Published Online: 2013-05-27
Published in Print: 1991-09-01
© 1991, Carl Hanser Verlag, Munich
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Artikel in diesem Heft
- Contents
- Contents
- Die Extrusion
- Finite Element Analysis of Polymer Melt Flow in Profile Extrusion Coating Die
- Simultaneous Diameter and Thickness Control in Tube Extrusion
- A Stick-Slip Problem Related to Melt Fracture in Polymer Processing Operations
- Effects of Plasticizers on Extrusion of Dry Blended PVC
- Flow-Induced Crystallization and Self-Reinforcement During Extrusion
- Molding
- A Fundamental Experimental Study of the Mechanisms of Warpage and Shrinkage of Polyethylene in Rotational Molding
- Closed Loop Control of Parison Dimension Profiles in Extrusion Blow Molding
- Liquid Crystal Polyesters
- Effect of Thermal History on Viscoelastic Properties of Thermotropic Liquid Crystalline Copolyesters
- Molecular Orientation and Modulus of a Thermotropic Liquid Crystalline Copolyester
- Production and Characterization of Fine-dispersed Mixtures of Liquid Crystalline with Conventional Polymers
- Processing and Properties of Polycarbonate/Liquid Crystal Polymer Blends
- Rapid Communication of Recent Advances
- Generation of Corners in Profile Extrusion**
- Coextruded Infrared Reflecting Films
Artikel in diesem Heft
- Contents
- Contents
- Die Extrusion
- Finite Element Analysis of Polymer Melt Flow in Profile Extrusion Coating Die
- Simultaneous Diameter and Thickness Control in Tube Extrusion
- A Stick-Slip Problem Related to Melt Fracture in Polymer Processing Operations
- Effects of Plasticizers on Extrusion of Dry Blended PVC
- Flow-Induced Crystallization and Self-Reinforcement During Extrusion
- Molding
- A Fundamental Experimental Study of the Mechanisms of Warpage and Shrinkage of Polyethylene in Rotational Molding
- Closed Loop Control of Parison Dimension Profiles in Extrusion Blow Molding
- Liquid Crystal Polyesters
- Effect of Thermal History on Viscoelastic Properties of Thermotropic Liquid Crystalline Copolyesters
- Molecular Orientation and Modulus of a Thermotropic Liquid Crystalline Copolyester
- Production and Characterization of Fine-dispersed Mixtures of Liquid Crystalline with Conventional Polymers
- Processing and Properties of Polycarbonate/Liquid Crystal Polymer Blends
- Rapid Communication of Recent Advances
- Generation of Corners in Profile Extrusion**
- Coextruded Infrared Reflecting Films
