Shrink Film or Bags
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What is a Shrink Film?Shrink Film is plastic that is heat sealed around an object or item that is being packaged. This loosly wrapped plastic is then hit with heat either from a heat gun or a heat tunnel. The plastic has additives that allow it to shrink when heat is applied. The plastic then forms around the product and the process is completed.
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Are you looking for Shrink Film, Shrik Bags or Shrik Wrap suppliers? If so, take a look below for some valuable information that may help you in your search. Here you will find information on what is a shrink film, how it is made, types of shrink film, applications of shrink film, options in shrink film or bags and many more.
Do not forget to take a look at our Buying Tips which would help you to save money on your shrik film or bags purchase.
available options in shrink packing
more information on shrink wrap films - reference: www.ezinearticles.com
Shrink wrap films are the most popular and inexpensive materials used for packing. Nowadays, shrink wrap films are available in a variety of models and sizes. Commonly used types include polyethylene shrink film, PVC shrink film and polyolefin shrink wrap. They pack products such as boxes, tapes, CDs, food, DVDs, videocassettes, jewelry boxes, photographs and frames.
PVC shrink films are used for packing non-perishable items, and are available in eye-catching colors. This type of film will shrink at low heat. Though PVC shrink film is approved by Food and Drug Administration (FDA) for food packing, it has a pungent odor.
Polyolefin shrink wrap film is a combination of polyethylene and polyethylene. It is more transparent and smoother than PVC shrink film. It usually requires high temperatures to shrink, but also works well with one step shrink wrap machines. Polyolefin shrink wrap films are more commonly used for packing food products. Polyolefin shrink wrap films are available in different forms such as low-temp polyolefin, anti-fog polyolefin and pre-perforated polyolefin.
A general purpose shrink film, the polyethylene shrink film is well known for its versatile nature. It can also withstand bad climatic conditions. So it is used to wrap large items such as boats and cars during the winter. Polyethylene shrink films mostly come with UVI protection to avoid damages caused by ultraviolet rays. EVA (Ethyl Vinyl Acetate) is added with polyethylene shrink films to keep them soft and flexible in winter. This heavy duty shrink film is available in eye-catching colors and attractive prints.
All types of shrink wrap films come primarily in two varieties, single-wound and centerfold. In centerfold shrink wrap films, the products are tucked in between the fold of the films, and then the edges are sealed. But in single-wound shrink wrap film, one layer of film is wound around a core. This kind of shrink wrap film is widely used for packing automatic equipment. The centerfold shrink wrap film is meant for semiautomatic and manual shrink packaging.
Shrink films are available in different widths and gauges, mostly in 60, 75, and 100 gauges, with a width above 10 inches. Generally, prices depend on the length, width, and qualities such as the shine and clarity. PVC shrink films are the cheapest of the lot. Shrink films can be availed from any of the local outlets or online stores specializing in the same. The main advantage of online stores is that they provide a wide array of options
types and material on shrink film
Generally there are three major types of shrink over wrap films:
- PVC low temperature shrink film which can be shrunk using either a hand-held heat gun or a conveyorized heat tunnel.
- Polyolefin shrink film which requires a higher heat to shrink it must use a conveyorized heat shrink tunnel.
- PolyEthylene (PE) in the form of Low Density Polythene (LDPE) is the best suited for general shrink wrap packaging. This is because it is relatively strong, inexpensive and has a good shrink ration.
Manual and semi-automatic shrink wrap machines use center-folded shrink film. Automatic machines can use either center-folded shrink film or flat single wound sheeting on rolls.
varieties of shrink film
- Light gauge shrink film
- Light force shrink film
- High speed shrink film
- Anti-fog shrink film
- High slip shrink film
- Perforated and ventilated shrink film
do you know how shrink wrapping works? Find out here.
The shrink wrapping process begins by enclosing a product in shrink film or a shrink bag. The film or bag is formed around the product using a sealer. Then, the product is heated so that the shrink film or shrink bag shrinks around it to create a tight, sealed package.
It mainly consist two steps as below:
Step 1:Shrink film is wrapped around the items to form a pack
Step 2:The film wrap is shrunk using a shrink tunnel and the wrapped items allowed to cool. The film strengthens, shrinks further and tightens around the items.
There are 2 wrapping methods - Sleeve wrapping and Over wrapping
Sleeve wrapping is ideal for regular shaped products that can be collated to form packs for palletising, warehousing or distribution.
Sleeve wrapping is easily automated. It uses two rolls of flat sheet shrink film. A welding bar is used to weld the ends of the PE sheets.
Note that the resultant pack is not totally enclosed because of the sleeve open ends.
Over wrapping achieves a total enclosure of the product by a perimeter sealing process performed on L-bar type machines that utilise Centrefolded film. Total enclosure can also be achieved using flat sheet film on a Flow wrapping machine.
Over wrapping suits flat rectangular products such as magazines, video tapes and CD's
When performed on an L-bar sealing machine the operation is as follows. The end of the film is sealed across the width and forms one of teh sealed sides of teh pack. Product is inserted between the layers of film, and then transferred together to the sealing station. Here the remaining two sides are sealed and the product is now completely enclosed by the film.
From there the package is moved onto the shrink tunnel conveyor to complete the operation.
advantages of shrink packaging
- Enhances the look of the package
- Maintains product quality
- Blocks dust and dirt
- Tamper evident/resistant
shrink wrap packaging applicationsShrink Wrapping Printed Materials -This is still the largest of all market segments. Once dominated by PVC films, the introduction of the low shrink force polyolefins has dramatically eroded the PVC domination of this market.
Businesses involved in this segment range from small job shop printers up to large business form producers. Gone are the days of contracting these jobs out, as most now perform the packaging within their own facilities.
Shrink Wrap Film For Toys, Games and Sporting Goods - Shrink is used here to assure product integrity and offer the consumer visual appeal. Plastic models, puzzles and games all benefit from the security of shrink film.
Shrink Packaging For Hardware and Houseware - A broad category with a tremendous variety of product being overwrapped. From tools to plastic bowls, shrink fulfills the need once served by corrugated and blister packaging.
Shrink Wrap For Packaged Foods - Major applications include frozen pizza, ice cream and frozen foods. The fastest growing trend is the process of multi-packing products for sale at wholesale type stores. The use of shrink offers the benefits of enhanced visual appeal, tamper evidence and prolonged shelf life, through the prevention of freezer burn.
Shrink Wrapped Stationary, Cards and Gift Wrap - PVC films are still widely used to protect these easily damaged products and improve appearance. Todays soft shrink films afford the opportunity to introduce polyolefin films into this market.
Shrink Wrap Packaging For Pharmaceuticals - Spurred by the need for tamper-evidence, this market has grown in recent years. Lower cost alternatives, i.e. PVC shrink bands, control most of the individual product need, however, shrink offers the ability reduce costs through multipacking with film vs. other packaging alternatives.
Shrink Wrap For Video Tapes and CD's - These products all benefit from some sort of film overwrap. Video is predominately shrink wrapped where CD is usually done with a non-shrink process such as tuck and fold. More and more CD producers have turned to shrink as they are updating equipment.
Shrink wrapping is widely used across the spectrum of industries and is finding its way into new segments daily. The retail appeal and security offered insures growth for the future.
Shrink Film Quantity Calculated by Package Size.
Shrink wrap sizing also known as package sizing is the act of determining the appropriate size film for overwrapping of a specific package with shrink film. Many factors must be considered when sizing the film requirements. The actual product dimensions, the orientation of the package as it will introduce into the film and the type of equipment to be used are all required information. Failure to obtain this information or incorrect specifications may result in inappropriate film size being calculated.
Each package has three dimensions which must be known. These measurements should be made with the orientation (positioning) of the package as it enters the film identified.
- Product Width: The dimension of the product in the Transverse (parallel to the cut-off or cross seal) direction.
- Product Length: The dimension of the product in the Machine (parallel to the fold of the film, in cases of centerfold film) direction.
- Product Height: The actual height of the product. In cases of products with uneven surfaces, the height should be considered from the bottom to the highest point of the package.
- Product Orientation: When measuring a product for film sizing, remember to use the longer dimension as the product width (bearing in mind, it must not surpass the seal dimensions of the equipment being used).
- Less shrink waste: By orienting the package using the shortest possible dimension as the product length results in the smallest amount of waste, in cases of centerfold use or side seal applications.
- Increased packaging speed: A shorter product length results in faster cycling of product's into and out of the sealing area. Over the course of a production shift this incremental time savings can produce large dividends.
- Increased film roll bag yield: Although a product requires the same square inches of film regardless of orientation, the amount of scrap produced is decreased.
Another consideration when recommending film size is production speed. In many cases, the formula to calculate required film size turns out not to be a whole number. Although 1/2" increments are available, most users opt for a standard inch size, usually rounding down in an attempt to save money. Many times this practice actually costs more than the cost had they rounded up and increased the film size. By trying to use the narrowest film size possible, users may actually make an operator's job more difficult, reducing production speed and increasing the overall package cost.
Once package orientation and dimensions are established, the next consideration is the type of equipment upon which the package is to be wrapped. Specific types of equipment dictate the use of either centerfolded or singlewound film. Furthermore, some types of machinery demand the use of wider film sizes than others due to the mechanics of their operation.
When using the film sizing formulas to calculate film sizes, be sure to use the formula for the type of equipment it is to be used on.Reference:www.provincialpaper.com
do you know which shrink film to use for your application? find out below:
Type of shrink film should be considered when sourcing a shrink wrap machine for system compatiblity and for application suitablity.
There are three shrink wrap film supply categories:
- PVC shrink film - PVC offers good optical and shrink characteristics. PVC film is very heat sensitive and requires special handling and storage. The films plasiticizer's which are added during manufacturing migrate with age, this causes the film to become yellowish and brittle. PVC film is very temperature sensitive requiring special handling and storage. Exposure to freezing temperatures tends to cause films to split and shatter.
- Polyolefin shrink film - Polyolefins is a generic term used to describe a family of polymers which include Polyethylene and Polypropylene. Our lines of Coextruded Polyolefin shrink film, are FDA approved for direct contact with food.
- Polyethylene shrink film - Polyethylene films tend to lack the optical properties and tight shrink characteristics needed for most shrink film applications. Polyethylene is predominantly used in the process of packaging known as bundling. Unlike other shrink films, polyethylene does not shrink at the presence of heat. Rather, it shrinks after exposure.
Looking on the internet and finding a right supplier of your shrink wrap film or bags can be daunting. What we can't help is to provide you with bags but we can list a points you should consider buying a quality shrink film at cheap prices:
- Lowest Prices
Compare prices in the industry & Save. For an example Polybags Limited, UK offers the lowest price on custom shrink wrap film and bags. They're committed to offering you low prices, so they'd love to know if you found a better price for any bags at another retailer.
- No Minimum Order
Choose a supplier who can offer you a low quantity purchase.
- 100% Satisfaction Guarantee
Again consider buying from a supplier who offers 100% no quibbles guarantee such as Polybags Limited, UK.
- Manufacture Bags to Your Specifications
Not any supplier would have any size you need in stock so choose a supplier who can make the shrink bags or film as per your need...
- Fastest Turnaround Time
If you looking for a custom bags and quick turnaround choose a manufacturer not merchants.
- Free Delivery
Calculate total cost of shrink film or shrink wrap film including delivery coz some retailer may sell cheap bags but charge an extra on delivery.
- Free Sample
If you unsure request a Free sample of your product before you buy. Polybags Limited,UK offers this service at no obligation.
Polybags Limited is UK's top supplier of polythene bags and shrink wrap film which offers most of above service....
cheap prices, buy online
Search results - found 1 UK based company.......
- Shrink Wrap film and Shrink Bags
Polybags Limited are manufacturers and suppliers of polythene bags, shrink film and packaging products. They supply PVC shrink film, polythene shrinkfilm or polythene shrink bags and poly bags of all kinds. Low Prices on the internet and Free U.K delivery. Order Today and Save Cash Now! www.polybags.co.uk
reference: ebay guides
Besides holding the scent of your product, shrink bags also give your soap or candles that finished look. Shrink bags will shrink down approximately 40%. They are easy to use:
Place item inside the shrink bag.
Fold bag over and clear tape, seal or just hold the end shut.
Use hair dryer or heat gun to shrink bag around the item.
If too much air stays in the bag, use a pin and make a small hole for the air to escape.
Bags shrink approx. 40%. If the bag is too long before shrinking, just cut some off.
The slower you shrink, the smoother finished product you will have. Be patient, it is better to shrink on lower heat. An adjustable heat gun is a great investment to product wonderful results. Practice makes perfect.
Also, you have the option of cello bags, which are coated to hold in smell. Cello bags do not shrink but can be sealed shut.
Never put your soap or candles in poly or kitchen zip bags. It will not protect the scent.
Determine the Sizes
1. To calculate band or sleeve sizes, you need to calculate the Lay Flat Width and the Cut Length. To do this:
The Lay Flat Width = Diameter in millimeters + 2
Millimeters x 1.57
Example: 100mm diameter + 2mm = 102mm
X 1.57 = 160mm
2. To convert
inches to millimeters:
25.4 millimeters = 1 inch
Example: 5 inches x 25.4 = 127 millimeters
3. To Convert
millimeters to inches:
1 inch – 25.4 millimeters
Example: 127 millimeters divided by 25.4 = 5 inches
4. To calculate
the diameter when the circumference (distance around the product) is known:
Diameter = Circumference divided by 3.1416
Example: 300 millimeters circulference divided by 3.1416 =
95.49 millimeters in diameter
learn different types of shrink wrap systems
- Straight bar sealers - A straight bar cuts and seals the film manually. For low volume applications.
- L-bar sealers - An L-shaped bar used to cut and seal shrink film. Averages between 0-40 packages p/min - depending automation level (ex: manual, semi-automatic, automatic, automatic continuous).AKA: impulse sealer, sealing system, sealing equipment, L sealer, L bar sealer
- Sleeve wrappers - Designed to wrap trayed or loose collated items. Mainly used in shipping applications. These Shrink Wrap Systems often replaces corrugated boxes and other types of packaging that are costly and need more space to use, store & dispose of. AKA: shrink bundler, shrink wrapper, heat wrapper, sleeve shrink equipment, sleeving system, etc.
- Form Fill Seal Shrink Wrap Equipment - The ultimate shrink wrapper, designed for high speed shrink packaging applications, averages between 30 -100 packages p/min on a continual basis. Most applications use polyolefin shrink film / industrial shrink wrap film.
- Heat Shrink Wrap Systems:
- Shrink tunnels - The final step in shrink wrapping. Package is passed through the shrink tunnel. Once inside the zone of the tunnel, it is subjected to increased levels of heat and turbulent air flow. A quality tunnel is capable of producing the required amounts of heat and air flow to cause the film to shrink around the introduced package.AKA: heat tunnel, shrink film tunnel, shrink wrap tunnel and shrink heat tunnel.
- Heat guns - Hand held tools that blow hot air to manually shrink film. Low volume output.
film sealing systems
Until recently, most sealing systems used a hot wire in order to seal and cut-off the film at the same time; now, a knife system has gained in popularity on many models, due to its durability. The wire or knife seals the film against a pad, covered with Teflon tape to protect the pad. Time, temperature and pressure are the three most critical elements affecting the seal quality. If the sealing head is not held on the film long enough, the temperature is too low, or the pressure is insufficient or uneven, the seal quality will be poor, and/or won�t cut. However, if the sealing temperature is too low, or the pressure is insufficient or uneven, the seal quality will be poor, and/or won�t cut. However, if the sealing temperature is too high, the film may break just behind the seal. Following the impulse sealing cycle, a cooling cycle allows the film to �solidify� into a solid seal. This dwelltime is critical in order for a seal to hold.
PVC films require only heat in order to cut seal and cut. When run on a sealing system as previously described, build-up of carbon char (black specs and flakes) will occur, and will need to be cleaned from the sealing head on a regular basis; otherwise, the carbon will interfere with the sealing process, and will look unsightly on the sealed ends of the package.
Since only heat is needed to form a PVC seal, some machines use a hollowed out bottom platen instead of the foam pad; direct contact with the seal wire is eliminated. Other systems employ a much thinner nichrome wire (.020� diameter vs. a standard .036� to .040� for polyolefins) against a hard bottom sealing pad. This system is insufficient to create strong polyolefin seals.
One other sealing system designed for PVCs is called a Universal Sealing System. Despite the name, the hot knife is typically too sharp to form a quality polyolefin seal. A rounded knife is better suited.
film shrinking systems
In order for proper shrinking to take place, polyolefin films need an air evacuation hole or multiple perforations. A bag formed with PVC film does not need �artificially created� air escape holes. Because of the make-up of PVC, the seal typically is full of small pinholes; this is where the air escapes during the shrinking process. While this may seem advantageous (a step can be eliminated), the small holes actually weaken the seal area. These holes are often located near or in the package corners.
In order for proper shrinkage to occur, polyolefin film must be exposed to the correct temperature for the correct amount of time (which is controlled by conveyor speed), and also be surrounded by the correct air velocity, or wind turbulence. The air allows the film to stand away from the product, and a �bubble� is formed around it. A good, even shrink should result when this occurs.
PVC films shrink readily when exposed to heat, and therefore air velocity is not critical. In the marketplace there are low-end tunnels which have no settings to control air velocity (similar to an oven) and you may find it difficult to achieve a good shrink.
learn different terms used in shrink wrap and films
- Angel hair - Thin strands of film appearing at the cut end of film resulting from sealing.
- Ballooning - A pillow effect created when air is trapped within the shrinking bag.
- Bead Seal - A thin round weld created when pressure and heat are applied to two layers of film.
- Bi-Axial Orientation - Oriented along both X and Y-axis.
- Blocking - A condition in which two layers of film adhere to one another.
- Blown Film - A film extruded by air inflation. Ex: blown stretch film such as:blown hand stretch film
- Burn Through - A temperature or condition where a film becomes cloudy or burns in the shrink tunnel.
- Centerfold Film (CW) - A centerfolded film is film that has been folded in half, lengthwise.
- Centerfolder - A mechanical device used to create centerfolded film.
- Coextrusion - Two or more polymers extruded and combined in a die, each forming a distinct layer in the final film.
- Cold Slip - The amount of force required to slide two surfaces against one another at ambient temperature.
- Cold Flex (CF) - Ability of a film to perform at low temperatures without failure.
- Copolymer - Result of two monomers being combined through polymerization.
- Core - A paper tube on which film is wound.
- Cross-Linking - A process which binds the polymer chains into a network. Significantly increasing a films heat stability and strength.
- Crow's Feet - A series of wrinkles radiating out from a finished package's corners.
- Dog-Ears - Triangular projections of unshrunk film at the corners of finished packages.
- Drape - The softness of a film characterized by the ability to conform to irregular shapes.
- Electron Beam - A device used in the cross-linking process.
- Fish Eyes - A scalloped surface on a finished product surface.
- Form-Fill-Seal - A type of equipment which produces a tube of film into which packages are introduced.
- Gauge - A term used to describe the thickness of a material such as shrink film / shrink wrap or stretch film / stretch wrap or pallet wrap ex: 100 gauge shrink film, 60 gauge stretch film, 70 gauge pallet wrap.
- Hole Punch - A mechanical device used to produce an air evacuation hole.
- Hot Slip - The amount of force required to side two surfaces of heated film against on another.
- Impulse Seal - A heat sealing technique where the element is pulsed with voltage during the sealing cycle.
- L-Sealer - A term used to describe equipment where the seal area is in the shape of a "L".
- Laminate - A general term used to describe structures comprised of two or more materials.
- Lap Seal - A seal made with two layers of film overlapping one another.
- Machinability - The ability to form and seal on overwrapping equipment.
- Machine Direction (MD) - The direction the film is manufactured and moves through the sealing equipment.
- Memory - The ability of a film to maintain its characteristics after shrinking.
- Monoaxial - A film which is oriented to shrink in only one direction.
- Monolayer Film - A single layer film extruded from one or a blend of raw materials.
- Mutilayer Film - A film comprised of more than one layer of similar or different polymers.
- Opaque - Relatively impervious to light. Ex: opaque white stretch filmopaque black stretch film (stretch wrap)
- Optics - The visual properties of a film. Examples of shrink film products with good optics include:
- Orientation - The stretching technique used in the manufacturing of film.
- Oriented - The stretching and aligning of a film's molecules at a temperature below its melting point.
- Perforations - Air evacuation holes in a film made by pin perforators.
- Pin Perforators - A device used to produce small holes in film to allow air to escape during the shrinking process.
- Polyethylene - A simple thermoplastic polymer of ethylene.
- Polymer - A material made through the process of polymerization.
- Polymerization - A gas heated under pressure forms a solid.
- Polyolefin - A generic term used to describe ethylene and/or propylene based plastics. Also see polyolefin shrink film and shrink film packaging products
- Polypropylene - A thermoplastic polymer of propylene.
- Preferential Shrink - The characteristics of a film to shrink more or less in a specific direction.
- PVC - Polyvinyl Chloride. Also a type of shrink film.
- Seal Wire - An element made from nichrome wire used to seal film.
- Selvage - Another term for trim waste.
- Shrink - Defined as the ability to become smaller.
- Shrink Tunnel - A type of equipment featuring a chamber producing heat and airflow designed to shrink film.
- Shrink Tubing - Similar to centerfold film, except the non-folded side is sealed to create a tube.
- Shrink Bags � A film that is sealed on three sides to form a bag in which to place product.
- Singlewound film (SW) - A single layer of shrink film wrapped around a core. Also called flat film and is used in high speed production (ex: automatic form/fill/seal).
- Slip - The quality of a film to move over surfaces with little resistance.
- Static - An electrical charge built-up in plastic film.
- Static Seal - A type of longitudinal seal used in FFS equipment. Overlapping film edges are adhered to one another via a static charge.
- Tap Switch - An electrical device used to control the amount of voltage introduced to sealing elements.
- Tear Initiation - The amount of force required to initiate a tear.
- Tear Resistance - The ability of a film to resist the propagation of a tear.
- Transverse Direction (TD) - The direction parallel to the film width.
- Trim - The amount of excess film severed during the sealing process.
- Trim Seal - A seal made by using a sealing wire element.
- Unbalanced - Unequal orientation in the LD and TD.
- Wind - The direction in which the film orshrink film is wound on the core.
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