Packaging grades

Since butyl acrylate is higher in molecular weight than vinyl acetate, higher weight fractions are needed to aehieve the same final level of erystallinity in the ethylene eopolymer. Typically packaging grades eontain 33% butyl aerylate. Thermal stability is far better than EVA, with butene rather than aeetic aeid produeed upon decomposition. Acetic acid can catalyze further polymer deeomposition and eorrosion of the applieation equipment. Low temperature properties are also... 

The soft-film solvent-deposited type can be used broadly for the same purposes as the hard-film type. A grease-resistant wrapping is required as an inner wrapping (as for all soft-film types) in packaging. Grades of this... 

Major types of volatile constituents in polymers include unreacted monomers, nonpolymerisable components of the original charge stock, residual polymerisation solvents, and water. Frequently, complex nonpolymerisable mixtures are present. The concentration of these substances may need to be determined for various reasons, such as the effects on materials properties and the risk of tainting in foodstuff- and beverage-packaging grades. For this purpose various GC methods are in regular use ... 

Best packaging grade offer of the market and universal flame-retardant product range Clean process... 

These products are used on a number of grades hygiene papers, some liquid packaging grades, wall paper base, sack grades, etc. 

Selar PT amorphous poly(ethylene terephthalate) (PET) blends combined the inherent barrier properties of PET with the ability to be processed on conventional equipment without orientation or crystallization steps. Besides food packaging grades, other industrial grades of Selar PT are available that rival PP or HDPE for paint pails and other containers that require a hydrocarbon or solvent barrier. 

Two basic excercises covering refining of short-fibre hardwood and long-fibre softwood pulps which are used in the paper machines producing fine paper and packaging-grade papers are included in this chapter. 

These packaging grades can be used as an additive for polystyrene to improve material stiffness at elevated temperatures as well as increase impact at low temperatures. 

Food packaging grades have the Noryl PKN designation and they include... 

Fig. 4.59 Fiber preparation system for packaging grades without fractionation (source Voith).

Board and packaging grades 3-5 odor problems (water and product)... 

Shoe presses have been standard in press sections for board and packaging grades since the 1980s. Later, they have also become state-of-the-art presses for graphic paper machines. Today modern press sections of high-speed paper machines consist of only two nips. They have for instance two double-felted nips or one double-felted nip followed by a second nip with a felt and a transfer belt... 

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