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Wood plastic composite is lumber product made from recycled plastic and small wood particles or fibers.
Wood plastic composite (WPC) that consists of polyethylene (PE) and wood sawdust tends to be used primarily in building and structural components. Such as decking board, Wall panel, Railing & Fence.
WPC Composite decking boards has a natural wood appearance, It's durable, environmentally friendly, without on-going, time-consuming maintenance and expense. WPC Composite decking boards delivers convenience, reliability, and a realistic texture that, makes your life better.
With the continuous improvement of manufacturing technology and technology, the quality of the product has improved greatly.
However, there are many plastic wood companies and even many large brands. Due to the lack of targeted research, the material design has congenital defects.
These defects often gradually expose the problems after two or three years. At this time, it is too late to solve the problem.
When tracking problems, material design defects are often difficult to find out. After the outdoor plastic wood building and scenery, some long -scale plastic trees will gradually bend and sag. This is currently a common defect in outdoor plastic wood buildings and landscapes.
The plastic wood material is beautifully bent and deformed after several winter and summer.
Temperature stress and creep
In summer, the temperature rises, and the plastic wood material produces heat. The long plastic wood heat expansion is large. Because the two ends are fixed, the temperature stress is also large (the stress and expansion are proportional).
When the expansion reaches a certain value, the plastic wood will be unstable and bend and deform and increase with the heat expansion. Deformation (bending) increases.
If the installation is installed in the high temperature season, due to the small temperature difference between the highest temperature, it will basically do not bend and deform due to thermal expansion.
However, in the low temperature season, the toughness and strength of the plastic wood decreases with the temperature; because the two ends are fixed, the temperature stress generated by plastic wood due to cooling and shrinking reaches the maximum value, which often leads to destruction in the fixed place.
Water -absorbent expansion creep
During the rainfall, the plastic wood absorbs water and expands, and the plastic wood material produces a small amount of creep and extension, which cannot be recovered; and with the dampness alternation cycle, the periodic creep is extended and stacked.With the effect of a possible water absorption and expansion limit and the binding force of polymer materials inside the plastic wood, the increment of water absorption and expansion and extension gradually decreases to zero to achieve the limits of creep.
The comprehensive result of the comprehensive result of temperature stress creep and water absorption and expansion and creep of plastic wood material creep is fixed when the two ends of the plastic wood are fixed, Gradually bending; and alternating in several winter and summer.
Deformation of plastic wood material deformation design solutions
Plastic wood material is very small in hygroscopic molecularity, and plant fiber is large; it is very important to effectively treat plant fibers to greatly reduce moisture absorption.
When the formula design and process design of plastic wood materials, the water absorption of plastic wood materials must be reduced as much as possible, and eventually uses strict water absorption rate as the quality index assessment; temperature stress and creep are determined by the characteristics of the material itself.
It must be obeyed from the characteristics of the material. It must be obeyed from the characteristics of the material. Polymer materials themselves find the improvement plan. Control and reduce the line expansion coefficient of plastic wood materials can effectively control and reduce temperature stress.
In addition, improving outdoor plastic wood buildings and landscapes usually use inorganic color materials with excellent natural aging performance to ensure the durability of coloring.
The reason why powder fading often occurs is that the surface layer of the plastic wood surface is aging, and the other is that there are often rainwater (commonly known as acid rain) with less ph (commonly known as acid rain) to erosion of inorganic color materials.
In the design of plastic wood, anti -aging auxiliary agents are often distributed. Actually, aging is actually gradually developing from the outside to the inside. Therefore, improving the aging resistance of the surface layer of the plastic wood is an important path to solve the surface powder fading.
In terms of design ideas of plastic wood high -end products for outdoor buildings and landscapes, plastic wood -type materials have been upgraded from the average composite material to dual -layer functional composite materials.
Through the improvement of technology, technology, equipment improvement and appropriate costs, the dual -layer distinction solutions are proposed. It is beneficial to the overcome of technical difficulties, so as to obtain high -quality, high -quality, high -performance, long -life high -end plastic wood profiles.
The PVC/PVC double -layer plastic wood -plastic wood -shaped material was promoted from the average composite material to the PVC base surface layer/PVC base core layer double -layer composite material, which was squeezed out of production.
Among them, the PVC base layer focuses on solving the surface aesthetics and enhanced life; PVC base layer focuses on solving size stability, physical mechanical properties, and optimization costs.
In short, according to the study of PVC, it has better creep resistance, and it is more suitable for the resin base of outdoor plastic wood materials; the internal control enterprise standard of outdoor plastic wood production enterprises should be compared with index such as water absorption rate, water absorption and expansion rate, and size change rate.
The national standards and bids are increased by more than 25% in order to better meet the requirements of outdoor buildings and landscapes; in order to effectively control the creep variables of outdoor buildings and landscape plastic wood products, outdoor plastic wood products should be detected and controlled.
Try to reduce the large -scale plastic wood structures at both ends in outdoor buildings and landscapes.
