PTT-(polytrimethylene terephthalate) was first used in the fiber industry, but PTT has similar physical properties to PET, and its formability is better than PBT. Therefore, it is a promising engineering plastic, and PTT enhancement. The material is superior to other crystalline resins such as PET, PBT, and nylon. Currently, PTT plastic products have 2 developing and competitive markets, films and bottles. After the stretching of the crystalline resin, the barrier properties, transparency and strength have been improved. The biaxially oriented PET (BOPET) film has been used to form a market of 200,000 tons per year. The PBT has a low glass transition temperature and poor drafting properties. It is difficult to make a stretch film. The glass transition temperature of PTT is higher than that of PBT, the moldability is good, the crystallization rate is pleasant, and it is suitable for biaxially stretched film. The longer the carbon chain of the glycol in the saturated polyester, the softer the molecular chain, so adjusting the ratio of the glycol in the copolyester can develop new uses not found in PET films. Stretch blow molded bottles can be prepared by utilizing the draftability of PTT. Shell, the pioneer of PTT market development, expects that the world's PTT demand will reach 1000kt in 2010, becoming a new large polymer, 80% of which is used as fiber, and the rest is mainly used as film.
Bench Drill is a compact size of the pillar drill that is designed for drilling holes through materials including a range of woods, plastics and metals. They are suitable for smaller holes or work pieces and have moderate to high speeds. The dills always come with a belt driver that makes it possible to select different speed: High speed for wood and lower speed for metal. In order to suit different size of projects, the height and angle of bench is adjustable.
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