PVC Shrink Bags & Rolls

Shrink Wrapping Manufacturers

Shrink bags, also known as shrink wrap, refer to plastic packaging films that shrink and wrap tightly around a product when heat is applied. The most common materials used for shrink bags are polyvinyl chloride (PVC) and polyethylene.

Shrink bags are a popular choice for both consumer goods as well as industrial product packaging as they offer several benefits:

• Protect products during storage, display, and transportation
• Tamper-evident and theft-deterrent as the package is tight around the product
• Waterproof and moisture resistant providing protection
• Transparent allowing product visibility – customers can see the product inside
• Custom branding and graphics can be printed on the shrink bags
• Reusable and recyclable material

Shrink bags are available in different sizes, thicknesses, and shrink ratios. They can be used for packaging:

• Food items like cheese, snacks
• Electronic items like cell phones, gadgets, cables
• Toys, games, craft supplies
• Cosmetics and beauty products
• Industrial parts, components and products

The most commonly used methods for shrinking are shrink tunnels and heat guns. When exposed to heat, the shrink bags shrink up to 40% into a tight wrap around the products.

At Dhanshri Polypack, we manufacture a wide range of PVC and polyethylene shrink bags and rolls to suit various packaging requirements. Our 20+ years of experience ensures excellent quality and competitive pricing.

What is PVC?

PVC stands for polyvinyl chloride, which is one of the most commonly used thermoplastic polymers in the world. Some key facts about PVC are:

• PVC is the third-most widely produced plastic globally after polyethylene and polypropylene.
• It is used extensively in construction applications such as pipes, fittings, windows, flooring etc. due to its durability and low cost.
• In packaging, it is used for making bottles, blister packs, clamshells, shrink films and more.
• PVC exhibits following properties:
• Versatile – can be made rigid or flexible
• Low density – light weight material
• Good mechanical strength – impact and scratch resistance
• Chemical and corrosion resistance
• Clear, glossy and smooth finish – ideal for packaging

• PVC can be produced in two forms:
  • Rigid PVC used in construction, appliances etc.
  • Flexible PVC used in packaging films, medical products, wires etc.
• Some common applications of PVC:
  • Pipes, fittings
  • Flooring, roofing, windows
  • Bottles, packaging films
  • Credit cards, ID cards
  • Wires, cables
• PVC can be colored or printed with custom colors, branding and graphics.
• It is economical and recyclable. Proper disposal does not release toxic chemicals.

At Dhanshri Polypack, we use food-grade PVC approved for direct food contact to manufacture shrink bags and films for packaging applications.

PVC Shrink Wrap

PVC shrink wrap refers to a thin film made of polyvinyl chloride that shrinks and wraps tightly around a product when heat is applied.

It is a transparent plastic film that is one of the most common materials used for shrink wrapping applications. Some key features:

• Available in different grades and shrink ratios. Higher the ratio, the more it will shrink.
• Can shrink up to 40% of original size to form a tight fit when exposed to heat.
• Provides a glossy, tamper-evident packaging.
• Can be printed with custom colors, branding, product information.
• Offers protection against dust, moisture, tampering during storage and transit.
• Allows visibility of packaged product through the transparent wrapping.
• Relatively low density material makes it lightweight.
• Heat resistant up to 60°C making it suitable for hot filling.
• PVC shrink wraps are recyclable and do not release toxins when properly disposed.

Facts About PVC Shrink Wrap

Some interesting facts about PVC shrink wrap:

• Available in different grades like low density, medium density, high density. High density films shrink the most.
• It can shrink up to 40% of original size depending on density and exposure temperature.
• Shrink wrap comes in different shrink ratios like 2:1, 4:1, 6:1. A 4:1 ratio means it will reduce to 1/4th of initial size.
• Needs exposure temperature of 90°C to 120°C to shrink. Heat can be applied using shrink tunnels or heat guns.
• Can be used to wrap odd-shaped products to create a tight custom fit.
• Printable using flexography and rotogravure printing up to 10 colors.
• Adds an attractive glossy finish for consumer packaging.
• Available as shrink bags, pouches, films and shrink wrap rolls.
• Offers transparency above 85% allowing visibility of contents.
• Can extend shelf life by providing a protective barrier against environment.
• Puncture and tear resistant compared to polyethylene shrink films.
• Heat and chemical resistant; can withstand up to 60°C after shrinking.

Difference Between Shrink and Stretch Wrap

Shrink wrapping and stretch wrapping are two common packaging techniques used for palletizing and bundling products. Here is a comparison between shrink wrap vs stretch wrap:

• Shrink wrap is a plastic film that shrinks and forms a tight fit when heat is applied. Stretch wrap is stretched and wrapped around products.
• Heat is needed to shrink the film in shrink wrapping. Stretch wrap adheres to itself and products without heat.
• Shrink wrapping results in a tight fit around irregular shapes. Stretch wrap leaves some slack and is mainly for rectangle products.
• PVC, polyethylene, polyolefin films are commonly used for shrink wraps. LDPE, LLDPE, PVC films are used for stretch wraps.
• Shrink wraps offer tamper evidence. Stretch wrapping can be loose allowing tampering.
• Transparency above 80% can be achieved with shrink films. Stretch films tend to be more hazy.
• Shrink wraps make a clean presentation with a glossy finish. Stretch wrapped products look more industrial.
• Stretch wrapping is better for stabilizing pallet loads compared to shrink wrapping.
• Shrink equipment like tunnels are more expensive than stretch wrapping machines.
• Stretch wrapping is faster than shrink wrapping.

In summary, shrink wrapping forms a tight fit using heat while stretch wrapping uses tension to wrap products. Shrink wraps make a cleaner retail presentation while stretch wraps are more for transport.

Shrink Wrapping Process

Shrink wrapping involves wrapping the product in a heat-shrinkable plastic film and applying heat to shrink it into a tight fit. Here is an overview of the common shrink wrapping process:

• The product is wrapped or covered in a shrink film by placing it in a shrink bag or through automated wrapping machines for tubes.
• The temperature of the shrink tunnel is set between 90°C to 120°C based on film specifications.
• As the wrapped product passes through the shrink tunnel, the film is exposed to heat and starts to shrink.
• The film shrinks up to 40% of its original size creating a tight wrap around the product.
• The final wrapped product exits the shrink tunnel.
• For manual wrapping, a hand-held heat gun can also be used to locally shrink areas of the bag.
• The shrink process parameters must be controlled to prevent over-shrinking and ensure product safety.
• Proper temperature and dwell time inside the tunnel ensures optimal shrinkage.
• The wrapped product is now sealed in a transparent, tamper-evident shrink wrap ready for retail display or transportation.

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