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Session 1664

Composite of Recycled High Density Polyethylene and Recycled Tire Particles by Compression Molding

Ping Liu, Tommy L. Waskom Eastern Illinois University

Key Words: Recycled plastics, high density polyethylene (HDPE), recycled rubber, composites, compression molding, design of experiment (DOE).

Prerequisite Knowledge: Behavior and processing of thermoplastics and rubber, compression molding of plastics, thermoplastic elastomers, design of experiments.

Objective: To introduce students to compression molding of composite from recycled high density polyethylene (HDPE) and recycled automobile tire particles. To optimize the process parameters using design of experiments (DOE) techniques.

Equipment: 1. Compression molding machine (A metallurgical specimen press can be good enough.) 2. Compression molds 3. Cutoff wheel or other cutting tools

Introduction: Plastic and rubber recycling is an effective means of reducing solid waste to the environment and preserving natural resources. A project aimed at developing a new composite material from recycled high density polyethylene (HDPE) and recycled rubber is currently being conducted at Eastern Illinois University. The recycled plastic pellets with recycled rubber particles are extruded into some HDPE/rubber composite strands. The strand can be further cut into pellets that can be used to fabricate other material forms or products.

This experiment was inspired by the above-mentioned research activity. In order to measure Durometer hardness of the extruded composite, a specimen with relatively large dimensions was needed. Thus, compression molding was used to form a cylindrical specimen of 1” diameter and 1” thickness. The initial poor quality of the molded specimen prompted a need to optimize the processing parameters such as temperature, holding time and pressure. Design of experiment (DOE) was used to obtain optimum combination of the parameters.

Experiment: The composite of 95%HDPE - 5%rubber was pelletized into small particles before being used for

...~z~>, .:4 ) 1996 ASEE Annual Conference Proceedings ‘o.+,1313#

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Waskom, T. L., & Liu, P. (1996, June), Composite Of Recycled High Density Polyethylene And Recycled Tire Particles By Compression Molding Paper presented at 1996 Annual Conference, Washington, District of Columbia. 10.18260/1-2--5924