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Polybags is the UK's number one polythene manufacturer.

We produce all of our own polythene packaging on site in our 50,000 sq ft factory, operating 13 blown-film extruders to make the polythene and 12 converting machines to turn it into the huge range of bags and sheets that our customers need.

Polythene extrusion lines work best when they run continually, so we operate 24-hour production to ensure that the quality of your products is first rate. This round-the-clock operation also improves production capacity, allowing us to manufacture and dispatch over 80 tonnes of quality polythene packaging products every week.

What's more, 24-hour production helps us keep costs down and provides us with the flexibility to prioritise key jobs, so your order is not only at rock-bottom price but our lead times are the best in the business.

With Polybags, you can guarantee you'll be getting the best value products on the market. There is a lot of polythene packaging to choose from so, if you are new to the manufacturing process, or just interested in how things are made, our handy guide (below) will give you an good idea of what we produce, how we produce it and the various options available to you.

Of course, you don't need to learn any of this unless you want to. You can always leave the manufacturing side to us and you just choose the product you require. If you have any questions the Polybags customer service team are always on hand to help, so please get in touch.

At Polybags we make our polythene packaging through the process of blown film extrusion - one of the most common manufacturing methods, in which an extruder heats and inflates raw polymer like a tubular balloon before cooling and flattening it ready for conversion into a huge range of plastic film or bags.

The diagram below gives an overview of the polythene extrusion process, which we will outline for you here.

Silo-fed raw material

The production of plastic film and bags begins with the raw materials used - granules or pellets of polyethylene, so how these are handled is a fundamental part of the process.

Polybags has eight huge external silos which each store up to 60 tonnes of these raw materials until the extrusion process begins as they are fed from the storage silos into the extruder. The advantages of this method include:

• Maximum hygiene for products as silo-fed delivery of raw materials to the extruder keeps the packaging free from contaminants
• Delivery of raw materials by tanker to the silos reduces environmental impact, as bags, pallets etc. are not required
• Delivering materials by machine rather than by hand means a more streamlined process and allows our operators to concentrate fully on the extrusion process

The extruder

The raw polythene materials are fed via a hopper into the extruder - a machine with a long horizontally-mounted barrel 20-30 times as long as its diameter, which contains an Archimedes screw turned by a large electric motor and is heated as it moves.

As the raw material is forced through the barrel via the screw it is melted by both the heater elements and the action of the screw. Once it reaches the end of the barrel, the molten polythene is pushed through some gauze filters and then upwards into the extruder die - which contains 2 circular steel pipes placed one inside the other with a gap of 1mm at the exit.

The polythene exits the die in a circular tube and - aided by a set of nip-rollers drawn up a tower reaching several metres above - forms a tall tubular bubble with the die at the base. Air is forced into the bubble until it reaches the required diameter whilst, at the same time, a high-speed air ring blows cold air onto the polythene to cool it down.

The film continues to cool as it is drawn up the tower, before passing through the nip rollers at the top, which flatten the polythene tube to create a layflat tube. This is then drawn through a series of rollers back down the extrusion tower, during which process it may pass through a treatment point and a printer, which can customise your polythene - most frequently when making bags - with your very own company logo or design.

At this stage, the polythene can be kept in the form of a layflat tube or it can be slit on one or both edges to produce various types of plastic sheeting products (see below). These are all wound onto a roll around a cardboard core ready for dispatch.

The layflat tube of polythene that exits the blown film extruder provides versatility as, depending on how it is cut, it can be turned into a range of polythene film products.

The diagram below provides an overview of the main polythene film products available from Polybags, which we will provide further detail on here.

• Layflat tubing (LFT) - LFT is the starting point for all other types of polythene but is also useful as a product itself. It can be used to convert into polythene bags and garment/laundry covers - so Polybags use this a lot! - whilst it is also available on the roll. LFT on the roll is ideal for customers who wish to make their own made-to-measure bags or have difficult-to-wrap items that they wish to pack and then heat seal. LFT can be gussetted at the sides so that it opens out to a greater width.
• Centrefold sheeting (CFS) - If layflat tubing is slit down just one side before winding around the roll then you get centrefold sheeting. As a result, when dispensed off the roll, CFS opens out into a sheet twice the width of the folded polythene. CFS is a popular method for wide sheeting, otherwise known as builders’ rolls due to its popularity within the building and decorating trade, thanks to its ability to conveniently cover large surface areas.

• Single-wound sheeting (SWS) & double-wound sheeting (DWS) - If layflat tubing is slit down both edges then you create two single polythene sheets laid on top of each other. These can be used to create either SWS (when wound around separate rolls) or DWS (when wound together around the same roll).
• J-fold sheeting (JFS) - While centrefold sheeting slits the layflat tube down one side, J-fold sheeting goes a bit further by removing a small strip of polythene away from the edge of one half of the centrefold sheet before winding. JFS is used predominantly in the manufacture of polythene bags, with the extra film on one side of the sheet being converted into a flap or lip on the bags

As well as these various types of polythene film, the layflat tubing that is created during the extrusion process can also be converted into a range of polythene bags. See our page on polythene bag manufacturing for more information.

What people in the street might say about polythene

LARGE CLEAR polythene suppliers DUST SHEETS polythene suppliers ROLLS DUST COVER DECORATING PLASTIC

polythene suppliers dust sheets give decoratours a fast, low-cost barrier against paint splashes, dust and scrape labels. A superb sheet does above sit on top of a surface; it requirements enough gauge to stay in position, cover awkward edges and resist tearing when moved around ladders, toolboxes or furniture. Thinner film can save money, nevertheless it soon wrinkles, lifts or leaves gaps where drips land. Heavier material handles tougher jobs better, particularly where floors and carpets need temporary protection amid messy prep work. The proper selection reduces cleaning time and limits accidental damage, which is often where the proper cost sits.

Buy polythene suppliers Bags for Plants Nurseries Online

Buying polythene suppliers bags for plants and nurseries online works optimal when the specification suits the method stock is handled from potting bench to dispatch bay. A light gauge may see efficient, nevertheless wet compost, sharp pot edges and repeated lifting often expose weak film very fast, particularly when sacks are filled unevenly or stacked hard on a pallet. Width matters as much as thickness, because a bag that is also narrow can pinch the pot and one that is also loose wastes space and makes filling awkward. Good seal quality and a sensible stop reduce leaks, split corners and collapsed loads, which retains handling damage down and reduces rework.

Bio-Degradable polythene suppliers

Degradable polythene suppliers can suit direct mail work when the pack requirements to see tidy on the machine nevertheless still reply a sustainability brief. The trouble is that the word degradable is often used loosely, and not all film behaves in the same method once it reaches a warehouse, a mailing bag or a recycling stream. A bag that beginnings breaking down also early can create seal problems, weak corners and handling damage before the consignment even leaves despatch. A better specification balances shelf life, film tension and print stop with the proper conditions of storage and transit, so the pack does its job before any breakdown starts.

A blanket ban on polythene suppliers carrier bags can create more problems than it solves on the warehouse floor. Thin-gauge film often does quiet, useful work as secondary packing for loose parts, hygiene-sensitive products and awkward mixed consignments, particularly where stock requirements to stay clean and countable. Once that material disappears without a proper mono-material substitute, handling acquires clumsier, small items are more likely to be lost or damaged, and staff stop up spending additional time sorting, rebagging or making do with poor alternatives. The proper issue is not nostalgia for any one plastic, nevertheless whether the packaging spec fits the job. A sensible rule should separate casual transport-out use from controlled packing requirements, and retain the proper film in a system that enables recovery and clean segregation.

polythene suppliers garment covers have to do above see tidy on a rail, because they are handled, shuffled and rebagged long before they reach a shop floor. Film that is also light will stretch at the shoulder and split around the hanger hole, while film that is also heavy adds waste and makes packed stock bulkier than it requirements to be. Good covers rely on proper gauge control, decent clarity and the proper balance between stiffness and flexibility, so the sleeve retains its shape without becoming brittle. That makes sorting cleaner, reduces snagging, and assists packed garments transport through the line with less rejects.

Black polythene suppliers bags can assist smoked fish grasp its value for a short period, nevertheless they do not stop quality loss once moisture beginnings creeping back in. In this case, the fish began at a fairly low moisture level, yet storage at ambient temperature still allowed gradual pickup of water from the surrounding air, which softened texture and manufactured the flesh less stable. That sort of change matters in pack handling because a product that seemed dry at dispatch can become limp, split more easily, and lose visual appeal on the shelf or in the store room. Packaging selection has to match the proper storage time, not the hoped-for one.

Perforated polythene suppliers bags are a practical selection when fruit requirements protection without being shut off from air. The small holes let moisture sit in the bag for a while, which can speed ripening and encourage size earn, nevertheless the film still requirements to be light enough to avoid trapping also much heat. Dark colours, particularly black, can grasp warmth and push the temperature up also far, which is a problem in transit or below cover. The method is often used on younger fruit because that stage is more vulnerable to infection spreading fast. Used with care, the bag assists manage the crop rather than smother it.

packaging manufacturers suppliers bags in a heavier gauge behave very differently from flimsy carrier stock, and that contrast matters once bags transport beyond a one-off handout. A thicker film around 75 microns stands up better to punctures, stretching and repeated handling, so it suits warehouse picking, store replenishment and fat consignment packing where light bags would split or distort. Wider side gussets assist the bag take awkward shapes more cleanly, which improves cube use on a pallet and cuts down on additional wrapping. That stronger base also gives decent print retention, so branding or handling labels still see tidy after storage and transport. The practical result is less waste, less rebagging and less damaged products at the point of dispatch.

GoSecure Extra Strong polythene suppliers Envelopes (Pack of 25)

polythene suppliers envelopes in a smaller size need above only a tidy appearance, because the film has to cope with sliding, rubbing and repeated handling before it reaches the client. A stronger gauge makes a proper contrast when contents are slightly strange, since thin material can split at the corners or stretch at the seam where stress builds up amid packing and transport. Secure sealing also matters, because a weak closure can fail as trays are stacked, sorted and moved through dispatch. Choosing a tougher envelope reduces handling damage and retains the consignment looking presentable at the other stop, which saves rework and complaints.

Big polythene suppliers bags give the simplest protection when powders, dye and damp are likely to dirty a vehicle cabin. Fine residue works into material and stitching, then sets harder once it meets moisture, so a smooth film barrier does above retain things tidy. The stronger bags rely on a proper gauge and even film quality, because weak points tend to split where heads and shoulders rub through the cover amid repeated getting in and out. Compared with towels or other makeshift wraps, they fit faster, leave less loose material in the footwell and are easier to remove without dragging pollution back into the cab. That makes them a practical selection for short turns and messy loads.

As the UK's number one manufacturer, Polybags can not only offer the range of polythene film products listed above, but we also offer a huge range of sizes, thicknesses and types of polythene film to meet your exact needs.

We can manufacture film from as narrow as 25mm (1") to as wide as 1.4m (55") and varying in thickness from thin 20 micron (80 gauge) film in special high melt films, through to 250 micron (1,000 gauge) heavy-duty films.

Our main types of film are listed below but please note that all film is available in a wide range of grades and colours and with blends and additives to order.

We take bespoke requests and manufacture film to a huge range of specifications so, if you have particular requirements for your polythene film, then please get in touch.

Standard Melt 2 Low Density Polythene (LDPE) - Polybags' standard film blend produces products that are easy to open or handle and are food-grade approved. Contains both an anti-blocking agent and a slip agent to help during the extrusion process. Used for: General packaging applications

High Melt 4 Low Density Polythene (LDPE) - This soft and flexible film has limited strength properties, which makes it perfect for light-duty applications and means we can produce our very thinnest films - as slender as 20 micron (80 gauge) thick. This allows us to save on the amount of film used in production, thus keeping costs down for the customer. Used for: Garment film and dust covers

Low Slip Melt 1 Low Density Polythene (LDPE) - Less slippy than standard LDPE film, this blend is useful for making heavy-duty sacks and other products that will be stacked. Its higher molecular strength also makes it suitable for shrink applications. By expanding the film whilst still molten and then quickly solidifying it, the polythene structure means it contracts when heated by shrink gun or heat tunnel. Used for: Shrink films and sack applications

High Tensile Films - This blend of polymers, which include Medium Density Polythene (MDPE), provide the maximum strength to thickness ratio - i.e. films that are both strong but thin. High tensile films have a rough, crinkly feel with reduced clarity and flexibility, but the material is ideal for thin food-grade tint sheets and other tinted or coloured films. Used for: Food bags and food sheeting

Electroconductive Blends - This electrically-conductive film is designed to protect electronic components which may be sensitive to static electricity. A blend of highly-conductive carbon and Low Density Polythene (LDPE), these products can be used for everything from protecting electrical devices to storing explosive devices. Used for: Protective antistatic packaging

Metallocene Blends - Films produced with metallocene - polyethylene raw material manufactured using a metallocene catalyst - are strong and of very high clarity. The films are more expensive than regular polythene due to the cost of manufacturing metallocene but, when you see the clarity of the finished product, you'll understand why. Used for: Premium high-clarity films

Reprocessed Films - Polythene produced with recycled raw material will not produce a product as high in quality as when using virgin polymer, but the resulting film offers an eco-friendly and low-cost packaging solution. Polybags recycles whatever raw material we can and we will always offer to extrude processed film when we can, although lack of supply is often our biggest problem. Used for: Low-cost and reduced-quality products

Biodegradable Film - Polybags' wide range of eco-friendly packaging is made from biodegradable film with an additive blend which provides first oxidative and then biological degradation, typically within 6 - 24 months of being placed in compost or landfill. A fantastic green alternative to regular polythene, this cost-effective, strong and recyclable film offers a superior solution to many other eco-friendly products on the market. Used for: Food waste bags, dog poo bags and other compostable packaging solutions

Top ten common things said about polythene

polythene suppliers dust sheets work optimal when the gauge, roll width and length match the job, because a sheet that is also light tears on sharp edges while one that is also heavy wastes material and slows handling. In decorating and building, the aim is not only keeping paint off the floor nevertheless covering enough area with a sheet that stays flat, resists draughts and does not split when moved across rough boards or rubble. Rolled stock is easier to transport to a trade counter or lift into a van, while pre-cut covers suit fast room protection and furniture wrapping. The proper specification retains waste down and makes the job cleaner, which saves time at both stop and beginning of a contract.

How To Buy polythene suppliers Bags Online United Kingdom?

Buying polythene suppliers bags properly beginnings with the film itself, not the headline price or the spectrum of sizes on a screen. A bag that sees fine in a listing can still cause trouble if the gauge is also light, the melt flow is uneven, or the seal line cannot cope with repeated handling at the select face. That soon turns into split bags, additional bagging, and wasted time on the warehouse floor. The better selection is a grade that suits the load, retains enough slip for easy packing, and does not add needless resin weight. That retains the consignment moving and avoids weak links in daily handling.

Degradable polythene suppliers works well for mail order packaging because the co-extruded structure gives the film strength without making it awkward to handle. A white outer layer improves appearance and assists the pack see clean at dispatch, while the black inner layer blocks light and retains contents out of sight. That opacity also reduces the chance of items being identified through the pack amid sorting or transport. In practice, the proper balance of film strength, gauge and seal quality matters above a simple material label. If the specification is proper, the pack transports through packing and delivery with less failures and less handling damage.

packaging manufacturers suppliers carrier bags need to be specified for handling strength first and appearance second, because a sharp design means small if the handle welds fail or the film stretches oddly below load. The proper job is to match the grade, gauge and blend to the method the bags will be packed, stored and issued, so they sit neatly in cartons or totes without sticking together or taking up excess cube. Slip level, ink stickiness and surface treatment all affect whether a bundle behaves on the line or becomes a sticky nuisance at the select-face. A bag that runs well in testing normally saves time in dispatch as well as complaints later on.

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polythene suppliers garment covers have to keep safe clothing without creating their possess handling problems, and that means the film spec matters as much as the seal. A transparent cover lets staff spot stock fast on the rail, nevertheless clarity is no superb if the gauge is also light and the bag splits where the zip track or hanger cut-out takes the strain. Better film grasps its shape, slides cleanly on rails and avoids snagging in secondary packing, which saves time in busy back-of-house use. The proper stop also retains garments looking clever through transit and storage, rather than leaving creases, scuffs or dust labels that reach the client.

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packaging manufacturers suppliers bags need to be specified for how they behave in proper handling, not only how they see on a first sample. The film gauge, seal quality and resin selection all affect whether a bag survives being filled, stacked, moved and opened again at products-in without tearing or slipping out of shape. LDPE normally suits bags that need more give and impact resistance, while HMHDPE offers a firmer feel and can improve pallet stability when lighter weight matters. A well-judged building reduces damage in transit and retains the bag doing its job through the all supply chain.

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Lightweight polythene suppliers envelopes with a white panel work optimal when fast dispatch matters above presentation, because they are easy to handle, fast to close, and retain weight down on outgoing consignments. The white panel gives space for addresses, labels, or handwritten notes to stand out properly, which cuts sorting errours at the packing bench and in transit. In a busy warehouse, that clearer marking can speed up select-face work and reduce re-labelling. The thin material also takes up small storage room and folds flat before use, so it suits operations that need a lot of packs without fat secondary packing. Used well, they retain packing simple without making the finished pack see untidy.

Big polythene suppliers bags work because they solve a handling problem that smaller formats cannot cover without additional labour or waste. A well-chosen gauge gives enough puncture resistance for dry products, furnishings or temporary weather cover without making the film so heavy that it becomes wasteful or awkward to convert. The proper test is how the bag behaves once it is filled: low tear propagation, decent seal quality and enough stiffness to sit properly on a pallet all matter far above appearance. If the material is also soft, stack stability suffers; if it is also brittle, one sharp edge can ruin a consignment. The practical selection normally comes down to matching film behaviour to the method the load is picked, bagged and moved.

Film additives

Polybags can introduce a series of additives to the polythene manufacturing process, blending them during production to give your polythene film or bags the specific properties you need.

We have a huge range of additives that we can add - so contact us if you have any queries - but here are some of the most common requests:

• Colour masterbatch - Colour your polythene to the exact tint you need with our complete range of colour masterbatch. Just pick the colour you need
• Outside storage - Protect your storage from the effects of sunlight with our UV additive, which prevents degradation. Useful for polythene stored outside
• Freezer grade - Protect your polythene during the freezing process with our EVA additive that prevents film cracking at temperatures as low as -30°C
• Anti-static - Protect electronic products from the buildup of static electricity with our antistatic additive that causes static to discharge across the surface of the polythene