THERMOPLASTIC RAILWAY CROSSTIE AND METHOD OF MAKING SAME

A cellular thermoplastic product such as a railway crosstie is produced by an apparatus comprising extrusion means for producing a web of a foamable thermoplastic polymer such as polyethylene, a mold corresponding to the size and shape of the cellular product positioned adjacent the extrusion means...

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Bibliographische Detailangaben
1. Verfasser:	HEINEMEYER, BEN W
Format:	Patent
Sprache:	eng
Schlagworte:	AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES FIXED CONSTRUCTIONS MACHINES FOR MAKING RAILWAYS OF ALL KINDS MAKING GRANULES OR PREFORMS PERFORMING OPERATIONS PERMANENT WAY PERMANENT-WAY TOOLS PREPARATION OR PRETREATMENT OF THE MATERIAL TO BESHAPED PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCESIN A PLASTIC STATE RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIALCONTAINING PLASTICS SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDEDFOR SHAPING OR JOINING OF PLASTICS TRANSPORTING WORKING OF PLASTICS WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
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Beschreibung
Zusammenfassung:	A cellular thermoplastic product such as a railway crosstie is produced by an apparatus comprising extrusion means for producing a web of a foamable thermoplastic polymer such as polyethylene, a mold corresponding to the size and shape of the cellular product positioned adjacent the extrusion means to receive the web of foamable thermoplastic polymer, and means for imparting relative reciprocal motion between the mold and the extrusion means in a direction generally normal to one of the surfaces of the web such that the web is deposited in layers within the mold. In producing a cellular thermoplastic product by the method of the invention, the steps include plastifying a thermoplastic polymer such as polyethylene in the presence of an expanding agent to produce a foamable thermoplastic polymer, forming the foamable thermoplastic polymer into a web, depositing the web into a mold, and imparting relative reciprocal motion between the web and the mold in a direction normal to at least one surface of the web such that the web is deposited in layers within the mold. The foamable thermoplastic layers in the mold fuse together at their mating surfaces thereby resulting in the cellular thermoplastic product.