Wrapping material

There are two different kinds of wrapping material, stretch film and packaging paper. Shrink film is hardly ever used for wrapping paper rolls, since the creases formed on the faces of the wrapped rolls do not allow one to store the rolls in a vertical position. Shrink wrap is only found in special apphcations, e. g. for holding finished paper rolls on pallets. 

Packaging paper is the classical and most commonly used wrapping material for paper rolls. It offers optimum protection for long transport distances and storage times. Packaging paper mainly comprises kraft or test hner sandwich papers with a PE Hning. 

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Sodium benzoate is also finding increasing appHcation as a corrosion inhibitor. It is incorporated into paper wrapping materials for the prevention of mst or corrosion in the production of such diverse items as razor blades, engine parts, bearings, etc. It is also used in the automotive industry as a corrosion inhibitor in engine cooling systems (at 1.5%), mainly in Europe and Japan. Unlike in its appHcation as a preservative where free benzoic acid is required to provide antimicrobial action, it appears to be the benzoate ion that provides the corrosion protection. 

Many materials used for food packaging contain chemicals which can migrate into the food in small quantities. These include plasticizers such as phthalate esters, used in wrapping materials, and bisphenol A, used in the resin linings of... 

Regenerated cellulose foil has been extensively and successfully used as a wrapping material, particularly in the food and tobacco industries. Like other cellulose materials it is now having to face the challenge of the completely synthetic polymers. Although the foil has been able to compete in the past, the... 

The wrapping materials usually consist of staple glass tissue, pulled halfway into the hot enamel, and an outer wrap of glass impregnated with coal-tar or asphalt enamel to produce a coating of approximately 2-5 mm as shown in Fig. 14.5. 

Newspapers are suitable as wrapping material to protect the samples from decomposition during shipping. 

Plastic foils used for wrapping TLC plates were once reported to contain amides of oleic, stearic, or palmitic acid as antiblocking agents which may migrate from the wrapping material [28]. Similarly, Amos [447] has encountered interferences from contaminants in solvents in the TLC analysis of phenolic AOs in turbine oils. 

As insulator, wrapping material, manufacture of toys, radio and television cabinets. 

Be sure that the stopper of the bottle is not mishandled or does not touch any source of contamination. Cover the neck of the bottle with new sterile wrapped material. 

Overwrapping, stretch-wrapping, or shrink-wrapping materials may be used on single items or bundles of 5, 6, 10, 12, 20, 24, or 25, depending upon the marketing preference. 

Refrigerator parts, packaging, structural housing panels, pipe, defroster and heater ducts, sterilisable household items and hospital equipment, hoops, battery parts, blow moulded containers, including automotive petrol tanks, film wrapping materials, wire cable and insulation and chemical-resistant pipe. 

Synonyms bivinyl, vinylethylene, biethylene Formula C4H6 Structure CH2=CH-CH=CH2 MW 54.10 CAS [106-99-0] petroleum product used to produce synthetic rubber, elastomers, and food-wrapping materials colorless gas, mild aromatic odor heavier than air gas density 1.865 (air = 1) 2.212 g/L at NTP liquefies at -4.5°C solidifies at -109°C slightly soluble in water, 500 mg/L, soluble in organic solvents carcinogenic flammable. 

Aerosols can often develop a powerful sulphurous rubber smell due to the quality or age of the rubber gasket. Soaps can pick up the smell of their wrapping material such as cardboard or even the smell of a plastic container. So often these problems are blamed on the perfume, and it becomes the job of the perfumer or application chemist to identify the fault correctly. 

Wrapping materials Gauze and rubberized cloth Impervious material Semiocclusive... 

Tin from cans, concrete, glass, aluminum, and plastic wrapping materials Yttrium -90... 

Use and exposure Tin is a soft, pliable, silvery-white metal. Tin is not easily oxidized and resists corrosion because it is protected by an oxide film. Tin resists corrosion from distilled sea and soft tap water and can be attacked by strong acids, alkalis, and acid salts. Tin foil was once a common wrapping material for foods and drugs, now replaced by the use of aluminum foil. Tin is used to coat cans of fruits and vegetables, processed foods, and industrial waste. - ... 

Determine the molecular formula of styrene, used to prepare the plastic wrapping material polystyrene. It is a compound of carbon and hydrogen only that contains 92.26% carbon, and has a molar mass of 104 g/mol. 

Do the wrapping materials for the different samples fit together or are they physically or chemically related ... 

Plate 4.5 Wrapping materials, illustrating how a physical fit might be identified. Copyright Michael D. Cole, Anglia Polytechnic University, Cambridge, UK, and reproduced with permission. 

In addition to physical relationships, it might also be possible to establish chemical links between the wrapping materials. This is conveniently achieved by using Fourier-transform infrared (FTIR) spectroscopy. If the materials are chemically different, then an exclusion can be achieved. If they cannot be distinguished, further examination of the drugs is required. 

Further to comparison between drug samples, it may also be possible to relate wrapping materials to someone or a place (a house, for example), or, indeed, to exclude such a relationship. However, whenever wrapping materials are compared, the drug materials should also be compared physically and chemically to determine whether there is a relationship or not. 

The most frequent comparisons of this type are between resinous samples. After examining the wrapping materials, the forensic scientist should make a physical... 

Wrapping materials should be carefully preserved, since it may be possible to compare the striae on such packaging in attempts to relate various samples to each other. 

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