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What are Polypropylene bags
Polypropylene poly bags are made from virgin polypropylene plastic. Polypropylene bags are versatile, attractive bags most commonly used for packaging small items such as beads and lollies. These bags can be sealed with a heat sealer like many other plastic bags. While polypropylene is similar to cello, polypropylene bags are much clearer with neater seals, and have the advantage of being less expensive than cello bags.
Polypropylene poly bags have been the choice for product presentation and preserving freshness. Polypropylene poly bags are a high clarity crystal clear bag which enhances the product's image. They provide a highly protective barrier against moisture, dirt and vapors and meet FDA and EFSA specifications for food content. Polypropylene bags also referred as 'Polyprop bags' or 'PP bags'.
These bags are by far the most popular for give away because of both its price and features. They are mainly used for displays.
History of Polypropylene
Professor Giulio Natta produced the first polypropylene resin in Spain in 1954. Natta utilised catalysts developed for the polyethylene industry and applied the technology to propylene gas. Commercial production began in 1957 and polypropylene usage has displayed strong growth from this date. The versatility of the polymer (the ability to adapt to a wide range of fabrication methods and applications) has sustained growth rates enabling PP to challenge the market share of a host of alternative materials in plethora of applications.
Introduction of Polypropylene
Polypropylene (PP) is a linear hydrocarbon polymer, expressed as CnH2n. PP, like polyethylene (see HDPE, L/LLDPE) and polybutene (PB), is a polyolefin or saturated polymer.
Polypropylene is one of those most versatile polymers available with applications, both as a plastic and as a fibre, in virtually all of the plastics end-use markets.
Properties of Polypropylene
(Semi-rigid, translucent, good chemical resistance, tough, good fatigue resistance, integral hinge property, good heat resistance).
Production of polypropylene takes place by slurry, solution or gas phase process, in which the propylene monomer is subjected to heat and pressure in the presence of a catalyst system. Polymerisation is achieved at relatively low temperature and pressure and the product yielded is translucent, but readily coloured. Differences in catalyst and production conditions can be used to alter the properties of the plastic.
PP does not present stress-cracking problems and offers excellent electrical and chemical resistance at higher temperatures. While the properties of PP are similar to those of Polyethylene, there are specific differences. These include a lower density, higher softening point (PP doesn't melt below 160oC, Polyethylene, a more common plastic, will anneal at around 100oC) and higher rigidity and hardness. Additives are applied to all commercially produced polypropylene resins to protect the polymer during processing and to enhance end-use performance.
Material Grades of Polypropylene
Three types of polypropylene are currently available. Each suits particular specifications and costing (although there is often some overlap).
Homopolymers - A General Purpose Grade that can be used in a variety of different applications.
Block copolymers - incorporating 5-15% ethylene, have much improved impact resistance extending to temperatures below -20oC. Their toughness can be further enhanced by the addition of impact modifiers, traditionally elastomers in a blending process.
Random copolymers - incorporate co-monomer units arranged randomly (as distinct from discrete blocks) along the polypropylene long chain molecule. Such polymers typically containing 1-7% ethylene are selected where a lower melting point, more flexibility and enhanced clarity are advantageous.
Different PP grades are available dependent on the application and chosen processing method.
Physical Properties of Polypropylene
|Tensile Strength||0.95 - 1.30||N/mm3|
|Notched Impact Strength||3.0 - 30.0||Kj/m3|
|Thermal Coefficient of expansion||100 - 150||x 10-6|
|Max Cont Use Temp||80||oC|
Chemical resistance of Polypropylene
|Oils and Greases||**variable|
How Polypropylene bags are made?
Polypropylene bags are made using polypropylene (fossil fuel based plastic, bi products in the pertrolium industry) by extrusion process.
There are two types of Polypropylene bags available in market and both manufactured by different method of extrusion.
- Cast PolyPropylene (CPP) Films or Bags
CPP or cast polypropylene film is a multilayer polypropylene film with co-polymer and homo-polymer. It is used as a heat seal layer along with BOPP or polyester film in a laminate for packing of food articles. CPP films have been known in the packaging field to be the more elegant brother of polyethylene film, with higher gloss, greater transparency and better heat resistance.
CPP films have higher gloss and transparency, higher strength, superior barrier properties and excellent sealing strength. They are available with a polished or embossed surface, gloss or matte finish, stiff or flexible, clear or colored, or in a combination thereof. They are versatile and the most cost effective films.
- Oriented PolyPropylene (OPP) Films or Bags
Holographic OPP films can be used exactly the same way as plain varnishing film. But in addition to the protection benefit, holography brings its own refractive and kinetic effects to enhance the visual appeal. As a cost-effective material, holographic OPP can also be used to laminate to cardboard. It can also replace plain OPP film to make flexible packages to boost the shelf appearance of products.
OPP films are very versatile, can be adapted for diverse uses and are suitable for many types of packaging machines. These films are lightweight, bringing extra advantage in terms of packaging and are environmentally stable. They offer superior printability, machinability, and graphic appeal and provide cost savings over other flexible packaging materials. They are moisture resistant and durable.
Oriented polypropylene film can be laminated to other materials such as paper, aluminum or other polymeric films. Laminations can be made using solvent-based or water-based materials. Printing technologies like gravure, flexo, offset UV, letterset UV and digital processes can be utilized to print OPP films.
Polypropylene Film Types and Common Applications
|Film Type and Common Applications|
|Description||Gauges(in mil)||Comments||Known Applications|
|Acrylic Coated Family|
|Oriented Polypropylene film that consists of a Polypropylene core with an Acrylic coating on each side.||.70, .75, .80, .85, .98, 1.0, 1.2, 1.32, 1.4, 1.6, 1.9||Outstanding clarity and sparkle, good moisture barrier, excellent flavor and aroma barrier||Candy Canes, Bulk Candy Bins, Popcorn Balls, Wrapped Candies, Gift Cards, Floral Corsages, Retail Gift Packs|
|Saran (PvDC) Coated Family|
|Oriented Polypropylene film that consists of a Polypropylene core with an Acrylic coating on one side and a PvDC coating on the opposite side.||.87, 1.1, 1.5, 1.7, 2.0||Excellent clarity, excellent oxygen and moisture barrier||Rack Candy, Chocolates, Brittles, Nuts, Pasta, Bakery Items, Trail Mixes, Soup Mixes, Dried Fruits and Vegetables, Spices|
|Coextruded Polypropylene Family|
|Coex has a polypropylene core and sealant layers, no barrier coatings.||1.0, 1.2, 1.4, 1.6, 2.0||Medium clarity, good moisture, good stiffness in higher gauges.||Pasta, Potpourri, Soup Mixes, Spices, Brittles, Candy, Retail Gift Sets|
Looking on the internet and finding a right supplier of your polypropylene 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 polprop bags at cheap prices:
- Lowest Prices
Compare prices in the industry & Save. For an example Polybags Limited, UK offers the lowest price on stock and custom polypropylene 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 polypropylene bags 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 polypropylene bags 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 polypropylene bags and polythene bags which offers most of above service....
Top PolyPropylene Bags Suppliers
Search results - found 1 UK based company.......
- Polypropylene Bags & Greetings Card Bags
Polybags Limited are manufacturers and suppliers of polythene and polypropylene bags/film. They supply greeting card bags, display bags, flower sleeves, minigrip bags, zipper bags, carrier bags, refuse sacks, bin liners, pallet wrap, garment covers, laundry film, biodegradable bags and poly bags of all kinds.... www.polybags.co.uk
Difference between Cast Polypropylene (CPP) & Biaxially oriented polypropylene (BOPP) fims
You can tell the difference between CPP bag and a BOPP Cellophane bag. You can not push your finger through a true BOPP bag. It is strong and stiff. A Cast PolyPropylene CPP bag will elongate when you push your finger through it. This tensile property, elongation, will allow CPP to elongate from 550% to1,000% of the film thickness.
The resultant bag will have a elongation dimple as in this picture
You can heat seal a BOPP Bag with and iron and it will not melt as easily as a CPP bag. The film is annealed in the manufacturing process which gives the film high temperature stability. Try this with your Cello Bag only if it is a Cello Bag, remember CPP bags will melt on you iron very easily .
All of the BOPP bags can be heated sealed with a regular iron or a industrial Impulse Sealer shown in this picture
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