Shree Tirupati Polypack
Manufacturer of PP/HDPE Woven Products
"Success Has A Simple Formula; Do Your Best And People May Like It." Sam Ewing
 
 
  Technical Resources  
 
  History That Delivered Results  
     
  At STP we think from the perspective of being our customer, ourselves. A successful product manufactured also needs right packaging towards its entry to key success in market. We believe that all it starts with your products, to figure-up fame for your brand; it broadens appeal, digs out connections with end users and unties the abilities that turn your supply-chain towards avalue- chain. At STP, we not only cater supply demands but our development personnel also stake their experiences towards design requirements to manufacture sustainable materials. At STP our objective all over is to provide results.

Within this short span, no wonder we’re the preferred packaging provider for the world’s leading brands. They rely on our innovative designs and packaging experience to open up the possibilities for them and so we offer to you.
 
     
 
 TECHNICAL RESOURCES
  POLYPROPYLENE
Polypropylene (PP), also known as polypropene, is a thermoplasticpolymer, made by the chemical industry and used in a wide variety of applications, including packaging, textiles.

Polypropylene is normally tough and flexible, especially when copolymerized with ethylene. This allows polypropylene to be used as an engineering plastic, competing with materials such as ABS. Polypropylene is reasonably economical, and can be made translucent when uncolored but is not as readily made transparent as polystyrene, acrylic, or certain other plastics. It is often opaque or colored using pigments. Polypropylene has good resistance to fatigue.

The melting of polypropylene occurs as a range, so a melting point is determined by finding the highest temperature of a differential scanning calorimetry chart. Perfectly isotactic PP has a melting point of 171 °C (340 °F).
  Degradation
Polypropylene is liable to chain degradation from exposure to heat and UV radiation such as that present in sunlight. Oxidation usually occurs at the tertiary carbon atom present in every repeat unit. A free radical is formed here, and then reacts further with oxygen, followed by chain scission to yield aldehydes and carboxylic acids.

In external applications, it shows up as a network of fine cracks and crazes that become deeper and more severe with time of exposure.

For external applications, UV-absorbing additives must be used. Carbon black also provides some protection from UV attack. The polymer can also be oxidized at high temperatures, a common problem during molding operations.

Anti-oxidants are normally added to prevent polymer degradation.
 
  Manufacturing
Melt processing of polypropylene can be achieved via extrusion and molding. The large number of end-use applications for polypropylene are often possible because of the ability to tailor grades with specific molecular properties and additives during its manufacture. For example, antistatic additives can be added to help polypropylene surfaces resist dust and dirt.
Many physical finishing techniques can also be used on polypropylene, such as machining. Surface treatments can be applied to polypropylene parts in order to promote adhesion of printing ink and paints.
  APPLICATIONS
A common application for polypropylene is as biaxially oriented polypropylene (BOPP). These BOPP sheets are used to make a wide variety of materials including clear bags. When polypropylene is biaxially oriented, it becomes crystal clear and serves as an excellent packaging material for artistic and retail products.
Polypropylene is widely used in ropes, distinctive because they are light enough to float in water. For equal mass and construction, polypropylene rope is similar in strength to polyester rope. Polypropylene costs less than most other synthetic fibers.
 
  RECYCLING
A common application for polypropylene is as biaxially oriented polypropylene (BOPP). These BOPP sheets are used to make a wide variety of materials including clear bags. When polypropylene is biaxially oriented, it becomes crystal clear and serves as an excellent packaging material for artistic and retail products.
Polypropylene is widely used in ropes, distinctive because they are light enough to float in water. For equal mass and construction, polypropylene rope is similar in strength to polyester rope. Polypropylene costs less than most other synthetic fibers.
 
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