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Shrink and strech packaging

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Shrink and strech packaging

  1. 1. BY MONISHA SELVAN
  2. 2. shrink wrapping, shrink film is used as the basic material(polyethylene , polypropylene and poly vinyl chloride) and heat forms an important part of the operation. Shrink Wrapping is done in 4 stages • wrapping (sleeve wrapping or over-wrapping) • sealing (necessary only for over-wrapping) • shrinking (with application of hot air), and • cooling .
  3. 3. • shrink packaging is most suitable these days for bulk packaging. bulk packaging will also adopt a technology called strength film technology . • Shrink Wrapped Transport Pack for Carbonated Soft Drinks
  4. 4. • Contour fit • Neat appearance • Product could easily be seen • Immobilization • Improved the product identification with reduced labelling costs • Elimination of damage in opening • Reduction of labour at the store level due to more rapid product identification and faster container opening
  5. 5. • Stretch wrap or stretch film is a highly stretchable plastic film that is wrapped around items. The elastic recovery keeps the items tightly bound.. • It is frequently used to unitize pallet loads but also may be used for bundling smaller items. • Types of stretch film include bundling stretch film, hand stretch film, extended core stretch film, machine stretch film and static dissipative film
  6. 6. • The most common stretch wrap material is linear low- density polyethylene or LLDPE, which is produced by copolymerization of ethylene with alpha-olefins, the most common of which are butene, hexene and octene. • The use of higher alpha-olefins (hexene or octene) gives rise to enhanced stretch film characteristics, particularly in respect of elongation at break and puncture resistance. • Other types of polyethylene and PVC can also be used. • Many films have about 500% stretch at break but are only stretched to about 100 – 300% in use. • Once stretched, the elastic recovery is used to keep the load tight.
  7. 7. • There are two methods of producing stretch wrap. 1) Blown: The resin is melted and blown out, it is air-cooled. This is a slower process but provides for higher quality in all the areas listed below. The cost of production is also higher due to the quantity that can be produced per hour. 2) Cast: The film is passed over cooling rollers. This makes the cooling process quick. The quality is not as good as blown but more can be produced in an hour with lower costs.
  8. 8. In pallet unitizing, stretch wrap can have several functions : • improved stability of products or packages, forming a unit load • more efficient handling and storage of unit loads • some degree of dust and moisture protection • some degree of tamper resistance and resistance to package pilferage
  9. 9. • stretch wrapping affords large energy saving and does not require the availability of fuel. • Stretch wrapping offers better protection from hostile environments and clear, tinted, or opaque films are available for product identification or pilfer protection. • stretch films are better suited to withstand shock and vibration owing to their elasticity and memory
  10. 10. • The cling property that makes stretch wrapping possible, can also promote load-to-load sticking and abrasion • Stretch films cannot be used to compress a pallet load in the vertical direction since it has its primary holding force in the direction of wrap, i.e. horizontal
  11. 11. • By employing LDPE film in a equal to the width of collation plus 50% of the height, the stretch wrapped collation will have excess film on both sides. • An end closer operation can follow the stretch operation and here the excess film width is treated with current of hot air which results in the film shrinking over the side face of the package, leaving a small opening on the side face • Depending upon whether the excess film is equal to the height of the package or less , the side opening can be controlled in size
  12. 12. • The wider the film the smaller the hole.In this manner the package can be made pilfer-proof. In many instances and depending upon the collation design, it is possible to have a very short over-width on the collation , and still obtain pilfer-proof characteristics. • Such would be case for example where the collation is at a single level or it is multi level but only two then the film width should be equal to the collation width plus the height in order to minimize the side opening.
  13. 13. • pallet wrap is a simple process of wrapping boxes or items that have been accumulated on a pallet and then pulled tightly together by the force of the film wrapped around the boxes or items. • It is minimising material handling at different stages of manufacture and wholesale or retail marketing.
  14. 14. The advantage of stretch wrapping of pallets is not only the reduction in packaging specifications and hence reduction in packaging cost
  15. 15. Shrink Wrapping Stretch Wrapping Equipment (heat shrink tunnel) are more expensive Equipment (relatively simpler and smaller)are generally less expensive Sealing required, particularly for overwrapping Normally, no sealing is required More energy required: Orientation plus heat energy to shrink. Less total energy - only stretching, but no heat. May not be suitable for heat sensitive items. Can even be used under cold conditions (refrigeration). Wrapped items (two or more) may stick together. Virtually, no film-to-film sticking. Can provide better weather protection, particularly with a total over-wrap. Less protective, may not be totally waterproof. Lower climatic protection.
  16. 16. Thank q

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