High strength composite floor

It is to be noted that the bulk density of cellulosic ?bers are much lower than PP matrix. Stark and Rowlands reported that ?ber content, rather than particle size, has the greatest effect on density.what is cast composite furniture They sug- gested that particle size does not affect speci?c gravity.The withdrawal strength of the WPCs varies signi?cantly with blending method . Figure 1a and b illustrate nail and screw withdrawal strength of the WPCs, respec- tively. Unlike nail withdrawal strength, the strength of panels made with extrusion method is signi?cantly higher than hot-pressed composites. The values of extrusion method range from 161 to 255 N/mm for poplar ?our, while the withdrawal strength varies from 146 to 200 N/ mm for hot-pressing method.

In other words, screw with- drawal strengths of the composites are enhanced between 10 and 27 %. The withdrawal strengths of nail and screw from panels are likely to be function of the mechanical properties of the base material, the process variables involved in the manufacture of the panel, and the geometry of the particles ].Better screw withdrawal results were obtained with extrusion method because of the higher density and more homogeneous structure of composites. This gives a smooth hole in the drilling process and smooth surfaces increase the bonding strength . Usually it is dif?cult to mix straw particles uniformly with PP due to their different bulk densities. The straw particles are much lighter than the same volume of PP pellets. where to buy chairs made of composite material In the hot-pressing method, the behavior of PP is to accumulate in the lower part of the mat, which results in no bonding medium existing between some straw particles. Blending process has highly signi?cant effect on the densities of composites . For instance in hot- pressing method, when average particle size increases from 40–60 to 20–40 mesh, density increases.

However, com- pletely different results were obtained for extrusion method. In this study, the effects of ?ber variability, size, content, and blending method on selected mechanical and physical properties of WPCs were investigated. The following conclusions can be drawn from the results and discussions presented above: 1. Single variable parameters studied in this work showed that they have signi?cant effects on withdrawal strength and density, while their interactions are not very signi?cant. 2. The poplar ?our showed superior properties compared with rice straw due to its chemical components and density. 3. The overall withdrawal strength of the composites ?lled with poplar was found to be higher than those made with rice straw. Maximum screw and nail strengths were 306 and 58.5 N/mm for composite typePF4, respectively. 4. Fiber content and size are in?uential factors in WPC processing and properties. plastic flooring Pest control The improvement in with- drawal strength of fasteners achieved can be signi?- cantly attributed to lower ?ber content and larger ?ber size. 5. It was observed that extrusion method provided much higher screw withdrawal strengths than the hot-press- ing method. However, hot-pressing method had the higher withdrawal strength of nail. It is due to the manufacture process of the panel, density, and the geometry of the particles in the panels. 6. The results provide better understanding of the behavior and performance of pull-out resistance for building systems.