Injection molding and extrusion of composites of low density polyethylene (ldpe) and plywood grindings

✍ Scribed by Pertti Törmälä; Esko Pääkkonen; Kristian Luoto

• Book ID: 102735011
• Publisher: John Wiley and Sons
• Year: 1985
• Tongue: English
• Weight: 525 KB
• Volume: 30
• Category: Article
• ISSN: 0021-8995
• DOI: 10.1002/app.1985.070300137

✦ Synopsis

Injection Molding and Extrusion of Composites of Low Density Polyethylene (LDPE) and Plywood Grindings

Modification of the properties of thermoplastics like polyolefins by means of low density cellulosic fillers such as wood flour and cellulose pulp has aroused considerable interest during the last few years.I4 The properties of these composites strongly depend upon the structure and properties of filler. Wood pulps with considerable large aspect (length to diameter) ratios ( L / D > 15) can act as reinforcing agents but their cost is usually prohibitive. On the other hand, cheaper wood flours with smaller aspect ratios ( L I D usually < 2.5) typically act as fillers which strongly increase the brittleness or decrease tensile strength of p01yolefins.l.~ It can be concluded that the aspect ratio of wood flour and its tendency to increase the brittleness of composite are inversely proportional to each other.

Plywood grindings are wood flour materials with fibrous-like nature. Therefore, they may be potential fillers of thermoplastics. This communication presents our results of processing (injection molding and extrusion) and properties of composites consisting of low density polyethylene and birch plywood grindings.