Plastic autofrettage method

Plastic autofrettage is not through the compelling force or plus additive effect, but by plastic gathered itself in the process of processing control and transformation so as to achieve a kind of modification methods of improving strength. The advantage of this approach is that modified simple process, low cost, does not affect the original plastic performance. Plastic autofrettage is reinforced plastic in the mainstream of development direction in the future.

plastic can enhance itself, mainly based on the following gathered form changes.
orientation degree increase, with the improvement of plastic products orientation degree, the tensile strength increases gradually, when the orientation degree at or near 100%, which meet the ideal molecular chain all around along the direction unbend arrangement at the hands of the state, the degree of stretch before close to its theoretical value. When the external force to make injection molding products processing break all the energy needed for primary bond macromolecular chain bond energy, because the Lord has valence can generally comparable time valence bond between molecular chain can big more than ten times. 's energy is huge, so need sales tensile strength increased rapidly. Crystallinity increase, with the constant improvement of the plastic products crystallization degree, the tensile strength increased.

plastic products LCD, as a result of plastic liquid crystal macromolecule for linear arrangement, and at the same time has the characteristics of high orientation, so the LCD plastic products has the very high tensile strength. Of course, not all plastic products can be LCD, rigid, and only those who have very strong polarity or hydrogen bond of a particular several minority polymer didn't have this ability. Therefore, reinforced plastic addition is not universal.

the crystallization quality improvement, because of the characteristic of the macromolecular structure itself within the plastic, plastic compared with small molecular crystals, crystal has the incomplete incomplete features, namely plastic crystals in various deficiencies. Typical plastic crystal lattice defects are: by the end of the chain kink, torsion caused by the local conformation error, local bond length, bond Angle changes and chain and chain of displacement caused by more skew lattice, etc. This is the crystal defects, leading to the whole strength of the plastic processing products is not high. Therefore, by improving the crystallization quality, can improve the strength of the plastic products.

eliminate internal stress and dispersion, due to the characteristics of plastic, in the process of the injection molding processing, unavoidably appear all sorts of internal stress. Especially the internal stress is larger or internal stress concentration, had a great influence on the strength of the plastic processing products. So, we can through the appropriate method, on the one hand, as far as possible eliminate internal stress, then one can make the residual internal stress evenly dispersed as much as possible, for some of the stresses in the increase of plastic products, and can be used to eliminate internal stress and dispersed enhancement modification method is effective.

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