Plastic bags
What is a plastic bag?
There are two answers to this question. The first one is simple - it is a bag made out of plastic. But not only did you know that already, but it only goes a fraction of the way to actually answering the question.
Plastic bags are often referred to as polythene bags, or polybags. These terms, used to mean the same thing, are all perfectly fine, although the term ‘polyethylene’ bag is more accurate. Most plastic bags these days are made from polyethylene, more commonly known as polythene.
Plastic bags come in all shapes and sizes and cover a multitude of uses, from the trusty old carrier bag that helps millions of people take their shopping home to the specialist waste sacks required by hospitals or people dealing with hazardous waste.
Not to mention all of the bags in between!
Packing bags, waste sacks, bubble bags, anti-static bags, minigrip bags, mailing Bags, postal sacks, waste sacks, black sacks, dustbin bags, bin liners, zip seal bags, recycling bags, biodegradable bags, specialist bags, high tensile strength bags and PolyMax extra strong bags - there’s a lot of polythene bags out there!
How are plastic bags made?
Plastic bags are made from polyethylene, with three particular types of polythene - each of varying densities - widely used for manufacturing bags: low-density polyethylene (LDPE), linear low-density polyethylene (LLDPE) and high-density polyethylene (HDPE).
The exact process of making a plastic bag will vary according to the type of plastic bag in question, the density of the polyethylene and the characteristics that the particular bag will require.
However, there are a few common factors used across the manufacturing of each type of bag. Polythene bags are widely created using a method called ‘blown film extrusion’, also known as the ‘tubular film process’.
The ethylene polymer resin used to create the bags comes in the form of pellets. These pellets are placed into a hopper and melted before being extruded to form a thin tube by forcing cool air into the tube, usually vertically from the bottom of the tube.
Once the tube reaches the correct size and the plastic has reached far enough up the cooling tower and cooled properly, it is taken away and flattened.
At this stage the tube can either be split into two halves, with each side used as a flat sheet of film, or the two sides of the tube can be sealed across the width of the film, before being cut and/or perforated to make plastic bags.
Types of plastic bag
If you say ‘plastic bag’ most people think of a standard carrier bag. However, there are many different types of plastic bag. Here are just a few:
Clear plastic bag - standard plastic bag made of clear or opaque polythene
Coloured plastic bag - standard plastic bag made of coloured polythene
Plain plastic bag - standard plastic bag (clear or coloured) containing no markings
Printed plastic bag - plastic bag printed with a name, logo, design etc.
Carrier bags - the classic traditional shopping bag, available with vest, cut, loop, clip close or grip seal handle styles
Gusseted bags - plastic bags with expandable sides (gusset) and a fitted bottom
Self seal bags - simple plastic seal clicks shut and pulls open to use time and time again (also known as grip seal bags or mini grip bags)
Zip lock bags - plastic bags with a zip seal used to open or close the bag
Drawstring bags - plastic bag with a drawstring at the top that fastens to close the bag
Merchandise bags - premium plastic bags printed with a company logo, slogan or design. Ideal for presentation.
Layflat tubing - cut this poly tubing to size and heat seal for your own made-to-measure bags. Perfect for packaging awkwardly shaped or difficult-to-wrap items.
Bags on roll - a roll of bags, wrapped around a central core, each attached to the next by perforation. Easily detaches with a simple tug
Where can I buy plastic bags?
Manufacturers and suppliers of plastic bags include:
Polybags Bulk Sales
Polybags Bulk Sales provides a low cost bespoke manufacturing service for large volume UK polythene users and packaging businesses. Orders placed directly with the manufacturers.
www.polybagsbulksales.co.uk
Polythene-Bags
Polythene-Bags.co.uk specialises in polythene bags with a range that includes mailing bags, waste sacks, display bags and more. With over half a century experience providing polythene packaging we're sure you will find the very best in polythene and polypropylene products.
www.polythene-bags.co.uk
Buy Plastic Bags
A brilliant resource if you want to buy plastic bags, with the ability to order online direct from the supplier. Contains loads of information on the different types of plastic bags available to buy, how plastic bags are made, how to promote your brand with printed plastic bags and much more.
www.buyplasticbags.co.uk
Buy Polythene Bags
BuyPolytheneBags.co.uk offers an extensive guide to polythene bags. With loads of information about all types of plastic packaging, from self-seal bags to antistatic bags to eco-friendly ones. Order direct from the manufacturers at low prices and with free delivery across the UK.
www.buypolythenebags.co.uk
Polybags Ireland
Online retailer of poly bags and polythene packaging offering the Irish the chance to save an extra 21% of all packaging products range.
www.polybags.ie
Polythene Bags
Dedicated division of a major UK packaging supplier and manufacturer, devoted to polythene bags. Working with polythene bags for over 50 years and now offering an increasing range of environmentally friendly products across the packaging spectrum.
www.polythenebags.co
Discount Polybag
International distributor of polythene packaging. Discount Polybag work direct with the manufacturer and can therefore extrude polyethylene film and make polythene bags to suit any order at a price that is right for you.
www.discountpolybag.co.uk
Polythene Bags
Polythene bags and plastic carrier bags specialist providing information about polythene bags, packaging and manufactured bags. All polythene packaging available direct from the manufacturers at low prices that don't compromise the quality.
www.polythenebags.eu
Discount Plastic Bags
Lists discount suppliers of shopping bags, polythene carrier bags and clear plastic bags. Discover how plastic bags are made, the differences between low and high density polythene and what eco-friendly options are available.
www.discountplasticbags.co.uk
Cheap Plastic Bags
Cheap plastic Bags has loads of information on plastic bags with useful links for you to buy quality products at great prices. Find out more about clear plastic bags, heavy duty plastic bags, resealable plastic bags, biodegradable plastic bags and more on this helpful website.
www.cheapplasticbags.co.uk
Research & Resources
For loads more detailed information about plastic bags, from the start of the production process right through to recycling, including details of the different types of plastic bags available, please visit:
Plastic Bags
A free online directory specialising in polythene packaging. Find great websites with lots of information on plastic bags and post your own product listings for free.
www.plasticbags.uk.com
Packaging Knowledge
This online magazine contains in-depth news and information on the world of packaging. Read articles and features and fact sheets about a variety of plastic bags.
www.packagingknowledge.com
Goldstork
Very useful "pick of the web" directory containing lots of interesting, off-beat and unusual websites. Goldstork also offers a vault with only selected hand-picked websites specialising in plastic bags.
www.goldstork.com
Notes on Plastic Bags
Industrial plastic bags market: Global Industry Analysis 2012 2016 and Opportunity Assessment; 2017 2027
packaging companies bags sit at an awkward nevertheless revealing junction of materials engineering, warehouse economics and stop-of-life compliance; the market is not shaped simply by headline demand, nevertheless by the fine tolerances that govern seal integrity, puncture resistance and line-speed performance on automated occupy systems. In practice, buyers are weighing far above unit cost: a bag specified with tighter micron-specific gauging and stable melt-flow consistency can reduce burst rates amid secondary bagging, improve pallet stability once loads are stretch-enclosed, and trim the tare weight impact across a full consignment without sacrificing drop performance. That is where the commercial hierarchy tends to emergebetween converters capable of maintaining film uniformity across high-density and low-density polythene suppliers blends, and those still competing on nominal thickness alone. Static behaviour, slip properties and surface resistivity also have a bearing, particularly where powdered products, granulates or mixed select-face stock are involved; poor control here leads to handling friction on the warehouse floor, misfeeds on bagging lines and unnecessary waste in despatch. At the same time, circular-economy pressure is beginning to favour mono-material buildings that can enter cleaner recycling streams, though that introduces its possess discipline around downgauging limits, reclaimed feedstock variability and the amortised energy profile of repeated extrusion. The result is a sectour whose competitive balance rests less on big market share tables than on who can reconcile volumetric efficiency, process reliability and recyclability in a format that still survives the realities of industrial handling.
Hdpe polythene suppliers Bags supplier in Pune
HM-HDPE polythene suppliers bags remain a mainstay where warehouse practicality matters above brochure language; the appeal is not merely breadth of size or gauge, nevertheless the method a high-density polymer structure delivers stiffness, low tare weight and proper seal performance in one format. On the line, melt-flow consistency and micron-specific gauging dictate whether the film runs cleanly through conversion equipment or starts to wander, neck-in and generate avoidable scrap; on the warehouse floor, those same parameters influence pallet stability, secondary bagging rates and select-face efficiency when stock must be handled at pace. There is also a less apparant commercial logic in specifying HM-HDPE above heavier alternatives: volumetric efficiency improves when flat-packed bags occupy less cube, consignments transport more usable units per load, and mono-material recyclability simplifies segregation once the bags have completed their first use cycle. None of that happens by accidentit relies on disciplined process control, sensible surface treatment where print or stickiness is required, and a manufacturing set-up capable of maintaining gauge uniformity across varied widths and thicknesses without compromising puncture resistance or opening properties.
The transport to restrict plastic bags is less a simple act of prohibition than a forced recalibration of the all carrier-bag supply chain, from film extrusion to the select-face. Thin-gauge polythene suppliers owes its commercial grip to awkwardly efficient physics: high-density polymer chains can be blown into micron-light film with proper tear resistance, negligible tare weight and superb volumetric efficiency in transport, which is why secondary bagging became so embedded in markets, depots and informal shopping. The trouble is that the same low mass that makes the bag cost-effective to transport also makes it costly to recover; mail-consumer film is prone to pollution, inconsistent melt-flow behaviour and poor reprocessing economics unless assortment is disciplined and mono-material streams are protected. Levies and bans so work optimal when paired with engineering detail rather than gesture minimum thickness standards to encourage reuse, surface-print limits to improve recyclate quality, and specifications that distinguish compostable claims from in reality recoverable feedstock. Without that rigour, stock simply shifts into heavier substitutes with a worse amortised energy burden and poorer pallet stability; with it, the sectour can reduce leakage while preserving the operational discipline that packaging quietly provides.
~ packaging manufacturers suppliers Bags | polythene suppliers Bags
Custom polythene suppliers Bags , packaging manufacturers suppliers Bags , waste segregation sacks
Plastic bags, pet waste allowed in Ottawa green bins starting July 2
The city is encouraging residents who opt for plastic bags to “reuse bags that may otherwise be thrown out, like milk or bread bags.”
Ishaku Bans polythene suppliers Bags In Taraba
Taraba State governour, Darius Ishaku has banned the use of polythene suppliers bags in the state capital. Ishaku also chided those spreading rumours that he died amid his one-week trip to London insisting that they would die before him.
Recycling and reusing plastic bags
A 2005 study by the Waste & Resources Action Programme (WRAP), cited by the Environment Agency in their 2011 report ‘Life Cycle Assessment of Supermarket Carrier Bags’, reported on how traditional lightweight ‘single use’ carrier bags were used after their initial intended use.
Their survey found that 89% of respondents reused at least some carrier bags. 59% of people said they reused all carrier bags, while 16% reused most of them, 7% reused around half and 7% reused some. Overall, it was estimated that 76% of carrier bags were reused.
The report also included details of how people reuse their carrier bags. The results can be found in the table below.
The reuse of lightweight carrier bags (WRAP 2005 survey)
| Reuse applications | % of respondents |
| Bin liner in kitchen | 53% |
| Put rubbish into it then throw it away | 43% |
| Bin liner in other rooms | 26% |
| Store things at home | 14% |
| Dog / cat / pet mess | 11% |
| Reuse for other shopping | 10% |
| Reuse for supermarket shopping | 8% |
| Packed lunches | 8% |
| Carry other things in when going out | 4% |
| Garden refuse | 1% |
| Give to charity shops | 1% |
| Put football boots / wellies in | 1% |
| Keep bottles / cans in for recycling | 1% |
| Other uses | 2% |
| Do not have a use / discard | 11% |
Source: Environment Agency - Life Cycle Assessment of Supermarket Carrier Bags
