Including packing tape, tear tape, adhesive tape and ropes. Plastic packing tape is made of polypropylene, high density polyethylene or polyvinyl chloride do with the embryo, oriented by uniaxial stretching, embossing from 13 ~ 16mm wide-band, single tensile strength 1300N more than metal or paper packaging strapping convenient and strong.
Structure and properties of the polymer chain basics of polymer materials
Polymer is a long chain molecules made up of atoms covalently bonded phase, it is not necessarily stretched straight, but have a variety of different shapes.
1. Composition and morphology of the polymer chain
According to the geometry of the polymer chain can be divided into linear and integrated two structures. 2. The forces between the polymer (1) bond strength
(2) secondary valence forces
Room (3) intermolecular forces on polymer properties
① less polar hydrocarbons, small intermolecular force and have good flexibility.
② If there are no major side groups in the molecular chain, relatively free movement, showing good flexibility. ③ with polar groups are large intermolecular force, if there are a large side groups, affecting the movement of the chain, and therefore has a certain hardness and strength.
④ If the polar group with a strong intermolecular force larger (such as hydrogen group), together with the molecular structure more structured,
It makes such a polymer having a high strength and other mechanical properties. .
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