Sealing & resealing bags

Buy from an extensive range of sealable and resealable bags, including grip seal bags, zip seal bags and self-seal bags.

Sealing and resealing bags are...

• Reusable polythene bags that can be opened and closed
• Designed for multiple use - open and close as many time as you like!
• Bags that can be sealed by a variety of means, including self-seal bags

Self-seal bags are...

• Manufactured with an integral sealing strip, located along the bag opening, to allow for easy opening and closure
• Also known as minigrip bags, mini-grip bags, gripper bags, grippa bags and resealable bags
• Ideal for securing bag contents and avoiding leakage or contamination
• Available in a variety styles to suit a range of uses, from storage bags to carrier bags
• Available in clear polythene with or without labels - to make a note of bag contents and help retrieval
• Available in variety of coloured opaque polythene - e.g. red, green, blue or black - to help with item storage and colour-coded retrieval
• Also available in more specialist polythene, from heavy duty grip seal bags to anti-static grip seal bags
• Sometimes referred to as zip seal bags. However…

What some people say about mailing bags

Big mailing bags need the proper film specification if they are going to handle mixed mail without splitting or turning awkward at the packing line. A polythene suppliers bag with the proper gauge retains enough body to assist trays of cards, envelopes and small parcels, yet still feeds and opens properly amid filling and re-bagging. If the material is also light, the neck can stretch and fail when handled; if it is also stiff, operatours lose speed and the bench becomes harder to work at. That balance makes a proper contrast, because a bag that behaves well on the line reduces grasp-ups and damage from the beginning.

Security mail bags need to be specified for rough handling, not only for a tidy first impression at despatch. The film has to survive being lifted, stacked, dragged through cages and squeezed into totes without turning all scuff into a false alarm, which is why gauge consistency and seal quality matter so much. If the material is also soft, punctures and stretch labels appear also easily; if it is also brittle, the bag splits where the load folds against an edge. A well-manufactured bag retains its tamper state readable through the journey, so staff can tell the contrast between normal handling damage and a pure breach. That makes sorting faster and cuts down arguments at the point of receipt.

Grey plastic mailing bags work optimal when the film is specified for handling rather than only appearance. A decent bag requirements enough stiffness to travel through packing lines without folding into itself, nevertheless not so much gauge that it adds waste to all despatch. Grey pigment assists conceal carton corners, mixed contents and the strange uneven load, which retains the package looking tidy and reduces the chance of visible stock showing through thin film. The proper test comes in seal quality and puncture resistance, because weak seals split in sortation and thin spots fail when sacks are dragged, stacked or pushed across concrete. A bag that balances strength with light weight saves trouble at packing and later on in the returns stream.

Recycled mail bags suit fast-moving package work where light protection and a low-material outer are better than wrapping all item in fresh plastic. The recycled content gives a decent stop for mail order products, spare office stock, and small spare parts, while the padded layer assists soften knocks from sorting belts, cages, and rough van loading. A superb self-seal strip also speeds up packing at the bench and cuts the need for additional tape. That only works properly when the gauge and seal quality match the weight of the item inside, though. A bag chosen to suit the job retains dispatch tidy and avoids wasteful overpacking.

Bolsas de plástico para correo mailing polietileno, autoadhesivas, 23 x 30 cm, 50 bolsas Red Mail Bags

Red mail bags need enough body to survive rough sorting and repeated lifts, because weak film gives method fast on belts, trolleys and sharp corners. A 55 mu polythene suppliers gauge offers a useful middle ground: stiff enough to resist scuffing and seam strain, nevertheless still flexible enough to fold flat for storage in cartons and cages. That assists warehouse staff stack and transport them without wasting space, and it reduces the chance of handling damage before the bag even reaches use. A well-chosen gauge retains the sack serviceable without turning all consignment into additional plastic and additional weight.

polythene suppliers mailing bags need enough strength to survive the rough first journey, because a bag that splits in sorting or in the van has small value after that. Light products like clothing put less strain on the film, nevertheless repeated folding, rubbing against other parcels and sharp corners can still smash down a weak gauge. Seal quality matters only as much as film thickness, since a poor seal opens up below pressure and turns a reusable bag into waste. A well-manufactured bag retains its shape, protects contents from damp and stays useful for later storage jobs.

Large Postal Bags

Large mailing bags have to earn their retain by holding awkward, soft or oversised products without adding wasteful weight or making handling harder. A sound specification is normally about above simply selecting a thicker film; the better bags use controlled gauge polythene suppliers that gives enough puncture resistance and seal quality without becoming stiff and brittle at the corners. That balance matters when sacks are dragged across floors, stacked in cages or fed through secondary packing lines, because a bag that sees heavy-duty can still split if the film flow or closure strip is poor. A well-chosen format also assists maintain pallet stability and retains dispatch moving without avoidable damage claims.

Strong mail bags have to survive far above the packing bench, because the proper punishment beginnings when consignments are sorted, stacked and moved through the network. A grey polythene suppliers mailer that sees tidy at first glance can still split at the gusset if the gauge is also light or the film is poorly manufactured, particularly when edges rub against other parcels or the bag is squeezed in a cage. Clean sealing matters also, since a flap that does not close properly risks peeling open below movement. A superb bag gives enough toughness without wasting material, and that balance normally means less handling damage claims and less trouble at dispatch.

Blue mail bags perform optimal when they are filled to a sensible level, because overloaded sacks are harder to seal, harder to lift and more likely to split amid handling. In dispatch areas, the trouble is rarely the bag material alone; it is the method the contents press against the seams and closure. A bag packed also tightly can conceal missing items, make counting awkward and slow down sorting at the point of despatch. It also puts additional strain on stitching and creates a rougher load for the vehicle. Keeping the occupy level practical protects the consignment and cuts avoidable handling damage.

White mail bags work well as a secondary pack for light products that need a bit of protection without turning the package fat. Their soft padding assists take the edge off scuffing on documents, printed sheets, discs and other flat items, while the pale outer surface gives a clean presentable stop in the dispatch area. That white background also makes labels, barcodes and addresses easier to read at a glance, which can speed sorting and reduce mis-selects at busy packing benches. Where products are moving through several hands, that clarity and tidiness can save time and avoid avoidable handling damage.

Zip seal bags are…

• Manufactured with a metal zip fastener or zip seal, making them…
• A more premium bag than a grip seal bag
• Used for storing important documents, such as art portfolios or school project work
• Ideal for use as a wallet for conference delegates or for exhibition attendees
• Also known as zip bags, ziplite bags or zipper bags

Sealable, resealable and self-sealable - there's more than one way to seal a bag

Sealable bags

Any plastic bag that can be sealed shut can be described as a sealable bag.

The sealing process can be carried out by any means, including a bag tie or clip (e.g. a sandwich bag with a twist tie), an adhesive strip, either external (e.g. sealing any bag with cellotape) or internal (e.g. as with a mailing bag), an internal self-seal strip (e.g. as with a minigrip bag) or by heat sealing with an external sealer (e.g. as with vacuum bags).

So any plastic bag that is designed with a seal can be called a sealable bag. However, not all sealable bags can be called resealable bags.

Resealable bags

Only bags where the seal can be reused can be classified as resealable bags. Some bags, such as mailing bags, feature a single-use seal that can't be reused without tearing open the bag itself and thus rendering it useless. Mailing bags are a very convenient way of sending post - thanks to their integral adhesive seal - but, because their seal is strong enough to keep the mail contents secude until the bag is cut or ripped open by the recipient, then a mailing bag is not a resealable bag, although it is a sealable bag.

Self-seal bags

Not every sealable bag be called a self-seal bag. This monicker is reserved only for bags that can be sealed closed without using any external sealing accessory - including adhesive tape, clips or bag ties - and without the use of a heat sealer to melt the polythene and seal the bag.

The most popular types of resealable bags are grip seal bags. These bags, which are sometimes known as mini-grip bags, gripper bags or grippa bags, feature an integral seal that runs along the top of the bag.

The seal contains a male (single) and female (double) ridge of plastic on opposite sides of the bag opening. When the seal is squeezed gently between thumb and forefinger, the male ridge fits snuggly into the female ridges to close the bag. This seal protects the contents of the bag from moisture, dirt and other external contaminants.

It can be used over and over again, which means the grip seal bag is a sealable bag, a self-seal bag and a resealable bag.

This handy bag is available in a huge range of sizes, made from clear, coloured or black polythene, with or without labels to make handy notes on the bag and with specialist options including antistatic bags - to keep electrical components safe - and specimen bags with accompanying record cards - perfect for hospitals, doctors' surgeries and police stations.

Methods of sealing plastic bags

The most common ways of sealing a polythene bag are by:

Sealing the bag with ties or clips. Fasten any bag shut with a plastic clip or twist shut with a tie. A popular method of sealing food bags for domestic use (e.g. clip a packet of frozen peas shut before placing in freezer, twist a sandwich bag closed for a packed lunch etc.)

Sealing the bag with a built-in adhesive flap. Some bags such as mailing bags are manufactured with a flap opening, where the flap contains a built-in adhesive strip attached along its length. Simply remove the cover from the adhesive and press the flap down to seal.

Sealing the bag with a built-in grip or zip seal. A range of bags are available with an integral strip that seals shut either by squeezing the seal together (grip seal) or pulling closed (zip seal). Very handy for regular use as they can be used over and over, these bags also provide great protection from moisture, dirt etc.

Sealing the bag with a heat sealer. If you really want to seal your bag shut tight this is the method for you. A heat sealer will bond two pieces of plastic when placed together in the sealer and the sealer is closed shut. A one-time seal, this method of sealing bags is popular for vacuum packing food.

Where to buy sealing and resealing bags

Resealable bag manufacturers and suppliers include:

Ziplock Bags
The home of ziplock bags online, this website features everything you need on ziplock, zipper, ziplite, grip seal and all self-seal bags. With a huge range of products at great prices and free delivery within the UK, this is the number one ziplock website out there.
www.ziplockbags.co.uk

Self Seal Bags
Specialists in self-seal bags, this website stocks a huge range of resealable bags from grip seal to mini grip and ziplock to ziplite. Packed with loads of useful information to help you choose the right bag for you, with free delivery to UK addresses.
www.self-seal-bags.co.uk

Plastic Self Seal Bags
Discount Self Seal Bags is the place to go to get resealable plastic bags at discount prices. Also features loads of useful information on self-seal bags, including a handy buying guide to make sure you pick the right sort of resealable bag for you.
www.discountselfsealbags.co.uk

Minigrip Bags
A website loaded with information on minigrip bags - aka grippa bags - and all types of self-sealing bags, with list of the best places to buy them online. Features a useful guide to anti-static self-seal bags, what they are used for and how they work.
www.minigrip-bags.co.uk

Zip Seal Bags
Zip Seal Bags contains loads of great information on zip seal bags and other types of self-seal polythene bags and eco-friendly alternatives. It also features a handy list of online zip seal bag retailers.
www.zipsealbags.co.uk

Antistatic Bags
Antistatic bags is the number one website dedicated to antistatic bags. Containing a wealth of information on antistatic packaging and how it works, along with details of where to buy it at the best possible prices.
www.antistatic-bags.co.uk

Resealable Bags
Resealable-Bags is a division of Polybags Ltd, the UK's number one polythene manufacturer, that specialises in resealable bags. Offering an unrivalled range of resealable bags and other polythene packaging at the best prices online.
www.resealable-bags.co.uk

Top ten common things said about mailing bags

Big mailing bags are a poor match for loose fixings because the contents shift like rubble rather than sitting neatly as a normal package load. Nuts, bolts and ratchets load the sack in sharp points, so a film that seems sound on paper can split along a seam, rub thin at the folds and belly out badly once lifted. That causes handling damage, awkward stacking at the select face and untidy van loading, particularly when mixed consignment sizes leave dead space inside the bag. A sensible specification beginnings with gauge and puncture resistance, not only stated capacity, because the proper film grasps its shape and cuts down repacking.

Security mail bags have to cope with rough handling as well as the need to display tampering clearly, which is why the material and closure design matter above simple appearance. A superb bag requirements enough gauge to resist puncture and seam stress when coins, notes or papers settle into one area, yet still remain workable on the line and in dispatch. If film consistency is poor, seals can lift, stretch labels can appear, and the first sign of trouble may only display when a load is already in transit. That sort of failure is costly because it causes delays, disputes and additional checking.

Plastic mailing bags succeed or fail in the warehouse long before they reach the letterbox, because the proper test is whether the film grasps up below fast packing and rough handling. A bag that sees cost-effective on paper can still create trouble if the gauge is also light, the seal line is weak or the material clings to itself amid picking and bagging. Good polythene suppliers mailers need enough puncture resistance to survive corners, polythene suppliers and tray edges, nevertheless they must also dash cleanly through the packing point without slowing the line. That balance saves labour, cuts split seals and retains dispatch moving at a sensible pace.

Details about   packaging suppliers RECYCLED MAIL BAGS

Recycled mail bags need enough recovered-film strength to cope with sorting, stacking, and repeated handling without opening at the seams. When the gauge is also light, the bag may see fine at dispatch nevertheless soon wrinkles, loses body, or splits where the load pulls hardest. That creates trouble in the mail stream and on the receiving side, particularly where parcels are bulked together and moved fast. A sound specification balances material savings against proper handling risk, so the bag retains its shape, carries return products securely, and avoids unnecessary losses from torn stock.

Red mail bags work properly when they are tied into a set sorting routine, not treated as a spare container for loose paperwork. Their bright red stop makes them easy to select out in a busy despatch area where select notes, dispatch slips and stock movement forms can all arrive at once, so the proper documents reach the proper point without delay. Problems normally start when a bag is overloaded or dragged across rough floors, as the stitching and closure then take more strain than intended. A sound gauge and firm seams retain the bag proper in daily use, and the light tare weight makes handling easier when cages or pallets are shifted by hand or truck.

polythene suppliers mailing bags suit lightweight mail because they keep safe contents without adding much bulk or slowing the packing line. The film shrugs off damp, minour scuffs and the rough handling that often happens in sorting systems, cages and van loading, so products are less likely to arrive labeled or wet. A superb bag also lies flat, feeds neatly at the bench and seals fast, which retains operatours moving at a proper pace when volumes are high. That makes the format a practical selection where speed and repeat handling matter above a like stop.

Large mailing bags need the proper film strength from the beginning, because weak gauge or poor seam control fast turns into split bags, damaged products and additional work at dispatch. A decent bag is above a big envelope; it has to handle boxed textiles, soft items and mixed online orders without falling apart when stacked, lifted or slid across a bench. Material consistency matters because uneven extrusion can leave thin spots that fail below puncture or stretch. A well-chosen size also reduces wasted null in cages and vehicles, which assists loading and retains select faces tidy. When the spec is proper, packing runs cleaner and the bag disappears into the job instead of causing fresh problems.

Strong mail bags need the proper film weight and seal performance, not only a heavy-looking wall of plastic. A bag that feels tough in the hand can still fail if the edges split below pressure, the seal lets proceed amid sorting, or a sharp carton corner works through the gauge in transit. Grey poly stock suits bulk despatch because it conceals contents, retains the pack looking tidy, and copes better with repetitive handling than flimsy film. A clean self-seal also speeds the packing line and reduces tolerance between operatours, which matters when consignment volumes are high. A bag that stands up to rough treatment cuts claims before they beginning.

Blue mail bags need tight control at the filling stage because the gross load level fast causes trouble further down the chain. A bag left slack wastes vehicle space and slows sorting, while one rammed full can strain the neck, distort the contents and fail when handled hard. On a busy floor, that means a transparent routine for loading, weighing and setting each bag aside as soon as it is prepared. Light bags on racks also assist with faster picking and less missed parts, so the work stays tidy and the consignment transports cleanly into dispatch.

White mail bags are a sensible selection when the contents need to stay low-profile through assortment, sorting, and delivery. A plain white stop does not advertise what is inside, so mixed consignments can transport through busy handling systems with less risk of casual interest or confusion. That suits dispatch areas where speed and order matter above presentation, because the bags see uniform on the line and are easier to treat as normal stock. A neutral outer also avoids clashes with printed packaging from alternative suppliers, which assists retain a packing bench tidier. When discretion matters above display, plain white is the proper sort of cover.

Research & Resources

For plenty more information on sealing and resealing bags, including the manufacturing process, types of self-seal bags available and their many uses, please visit:

PlasticBags.uk.com: Browse through a huge range of self seal bags websites or, if you are a manufacturer, list your products for free on this online directory specialising in self seal bags and other plastic packaging.

PackagingKnowledge: The UK packaging industry's number one website contains huge amounts of information and in-depth articles on self seal bags.

Goldstork: This free online directory features specially selected information and hand-picked features on a range of self seal bags and resealable bags.

What is static electricity?

Every object in the world - ourselves included - is made of atoms, which are in turn made of protons, neutrons and electrons. While neutrons have no charge, protons are positively charged and electrons are negatively charged.

In normal circumstances, the number of protons and electrons in an atom balance each other out, meaning that atoms have no charge. However, when two items rub together or separate, the electrons contained within these items can move from atom to atom or even from item to item, thus giving the atoms a positive or negative charge.

If the items involved in this situation are made from a material that does not conduct electricity - an insulator - then this charge can not move. The result is static electricity.

How do antistatic self-seal bags work?

If any static electricity comes into contact with an antistatic self-seal bag, rather than pass through the bag and risk damaging the electrical components inside the bag, the electricity passes around the bag and dissipates before it can make contact with the components, thus removing the possibility of damage.