Poly Postal Packaging is a
leading manufacturer and
supplier of polythene and
If you want to be absolutely certain that your goods are not going to be seen in your mailer and budget is a requirement, then these Black mailing bags are just the thing. All of the mailing bags that we manufacture are designed to be opaque and non see through however. Our Black mailing bags are a very popular line. Our Black mailing bags have been part of our stock range of mailing bags for over 7 years now and are very popular with mail order companys. These mailing bags are manufactured in a glossy mono film. Mono film is a polythene which is made up of one layer unlike the two or three layers you get with Coex. We have manufactured these bags at 55mu/220gauge and they are also 100% recyclable
The film is completely opaque so that you cannot see contents. If you have used black mailing bags before, you will have experienced problems with labels, stamps even the glue tape on the lip not sticking very well. This is because black polythene bags have a tendancy to be very glossy and this effects the adhesion. We have combated this problem by making ours in a Matt-Mid Gloss finish and incorporated our strongest permanent bag tape.
We specially treat the film in the manufacturing process so that the glue on the lip sticks permanently as it should and to ensure that the polythene film accepts stamps address labels etc. If you need bags for items with sharp edges and heavy in weight then ideally you should be looking at our Heavy Duty Mailing Bags.
Advice & Usage Guide
Use; The bags will arrive folded or laid flat in an outer Carton. Once you unpack the mailing bags, simply slide or drop your product into the mailing bag. The best method for sealing the mailing bag is to then lay it on a flat surface, lip/glue facing up. Peel off the release tape from the lip which covers the glue and then fold the lip over onto the body of the bag. We strongly advise that you only fold the lip over to where it naturally wants to fold to and no further. If you fold the lip right over and seal it, lets say half way down the bag, then there is a chance that the glue will not form a perfect bond and the bags could come open. We specially treat the mailing bags in the direct area where the lip folds over to as this helps with the bond formed by the glue migrating into the film.
Storage; We recommend that mailing bags with Permanent Tape are stored at a temperature of 15 - 20 degrees and 50% relative Humidity. If the ambient temperature falls to less than zero - 5 degrees then you should ensure that you have a means of warming the mailing bags in use. This because the very cold temperature hardens the glue and so it takes longer to form a bond with the film.
Extra Padding?; If you feel that you could do with a bit more protection for your products in transit due to them being fragile or delicate, then why not try our bubble inserts with these mailing bags. You don’t even need to buy the same qty to match as you can pick and use when you feel you need to using bubble lining when shipping your goods! Alternatively we stock bubble wrap and boxes.
Size in mm: 120 x 170 + Lip +/- tolerance
Size in inches: 4 x 6 + Lip +/- tolerance
Opening: on the 120mm side
Glue: Permanent Hot Melt x 1 Strip on the lip
Thickness of the Poly: 55mu/55micron/220gauge
Qty Per Box/Pack: 1000 approx
Weight Per Bag: Approx 2.5 grams +/-
Environmental Impact: These bags are 100% recyclable.
Royal Mail Postal Category: Letter