Search results
Results From The WOW.Com Content Network
Linear low-density polyethylene (LLDPE) is a substantially linear polymer (polyethylene), with significant numbers of short branches, commonly made by copolymerization of ethylene with longer-chain olefins.
LDPE has SPI resin ID code 4 Schematic of LDPE branching structure. Low-density polyethylene (LDPE) is a thermoplastic made from the monomer ethylene.It was the first grade of polyethylene, produced in 1933 by John C. Swallow and M.W Perrin who were working for Imperial Chemical Industries (ICI) using a high pressure process via free radical polymerization. [1]
The production started in 2010 and is located in Triunfo, South of Brazil. Today the Braskem industrial unit has an annual production capacity of 200 000 tonne of Green Polyethylene. Green PE has the same properties, performance, and application versatility as fossil-based polyethylene, which makes it a drop-in replacement in the plastic ...
Manual (or hand) wrappers: Extended core : An extension of the film's core serves as a handle for wrapping; this type of wrapper offers little stretch control and is hard on hands. Mechanical brake : A simple structure supports a film roll and a mechanical brake system provides resistance creating stretch of the film.
Polyethylene was first synthesized by the German chemist Hans von Pechmann, who prepared it by accident in 1898 while investigating diazomethane. [12] [a] [13] [b] When his colleagues Eugen Bamberger and Friedrich Tschirner characterized the white, waxy substance that he had created, they recognized that it contained long −CH 2 − chains and termed it polymethylene.
MFI Measuring device. The Melt Flow Index (MFI) is a measure of the ease of flow of the melt of a thermoplastic polymer.It is defined as the mass of polymer, in grams, flowing in ten minutes through a capillary of a specific diameter and length by a pressure applied via prescribed alternative gravimetric weights for alternative prescribed temperatures.
Recycling codes on products. Recycling codes are used to identify the materials out of which the item is made, to facilitate easier recycling process.The presence on an item of a recycling code, a chasing arrows logo, or a resin code, is not an automatic indicator that a material is recyclable; it is an explanation of what the item is made of.
Cross-section of a plastic extruder to show the screw Short video on injection molding (9 min 37 s). Plastics extrusion is a high-volume manufacturing process in which raw plastic is melted and formed into a continuous profile.