In a stretch film
The ability to stretch has brought a great popularity and distribution to this packing film. This is a durable, easy to use, economical material that easily provides the bond and the safety of any cargo during transportation.
The stretch film is indispensable for packing of goods having the irregular shape or even shapeless, it can be used both for packing of large number of small goods and large-dimensioned goods. It can be used both in manual and in machine methods.
Pallets packed with a stretch film are safely and securely protected from exposure of adverse weather conditions, such as wind, snow and rain.
Due to its low degree of stickiness the stretch film allows to retain the goods in a group package. Transparency of the film allows monitoring the cargo status, to see what the goods is inside, it helps to create an attractive appearance of the packed goods. Stretch film is resistant to cuts, punctures, bends and breaks, what protects the cargo from various mechanical damages, contamination and theft.
The drawback of this film is the following. Since the film is stretched and works in conditions of constant values of relative elongation, the tensile stress acting in it decreases with time. With the course of time, the tightening force in film is reduced, and the higher the ambient temperature, the faster, because relaxation processes are accelerated with the temperature rise. Therefore, take into account that having packed the cargo tightly in the stretch film, for example, in Finland in winter and sending it to the southern countries, one can get the reduction of tightening force of the film in an endpoint.
In bags (envelopes)
Envelopes are used not only for letters, postcards and documents sending, but also for packing of goods, having a flat shape, such as CD, DVD, BD, brochures, booklets, electrical parts, jewelry, photo products, photo frames, paintings, souvenirs, games, etc.
Envelopes provide protection from dirt; they are suitable for printing, sticking of stamps and labels, pen or marker inscription.
They are made of paper, cardboard, polyethylene and other materials, depending on the purpose. The most popular are the envelopes with window, in order to see and identify the contents.
The bags can be packed both manually and by machine. Packing in envelopes is very convenient because it does not require packing equipment, if we talk about small quantities of goods. And for millions circulations you will need an automatic that insert the contents into the envelope.
The drawback is the relatively high packing cost of one unit in contrast to methods that use film, and the difference can be 3-5 times. The drawback also is the limitation of scope only with the flat objects.
There are 2 types of sacks - polypropylene and kraft paper. Polypropylene sacks are popular, economical and easy to use package. They are used for packing, transportation and storage of bulk cargo (cement, mortar, sand, coal, compound feed, etc), including food products (sugar, salt, flour, cereals).
Kraft paper bags are durable, eco-friendly packaging. Cement and dry mixes, charcoal, food, seeds, fertilizers and much more is packed in it.
Advantages of bagging are obvious: the bags are easily customized to fit any product by changing the size, number of layers, density and so on; they are inexpensive compared to other types of packaging; the used packaging is easily recyclable and does not pollute the environment.
The drawback of this type of packaging is that it can only be used for bulk products.
Packing in thermo shrink film
The thermo shrink film is a polymer film capable of shrinking under the influence of a temperature higher than the temperature of softening of the polymer.
Thermo shrink film is divided into several types. Depending on the source of raw material, it is a polyvinyl chloride (PVC), polyolefin (POF) and polypropylene (PP, BOPP) films are distinguished, the most common types of films.
Depending on the extrusion technique they are divided into the sleeve, semi sleeve and film. Polyvinyl chloride and polyolefin films are used for "seal" type of packing, polypropylene film is used for "envelope" type of packing.
"Seam" packing in POF and PVC film
POF and PVC films find a wide application in a food industry for packing of various food products, bakery and confectionery products, meat and poultry, semi-finished products, multiple package of cans, bottles, boxes, packages and other.
In the field of non-food goods, POF and PVC films help to carry out BD, DVD and CD discs packing, perfumes, magazines, newspapers, stationery, medical supplies, gifts, electronic products, household products and other.
The packaging of the POF and PVC film can be divided into three groups: individual, group and stacked packaging.
Seam type of packing is inferior to envelope packing in the accuracy and beauty of the junction, and this is its main drawback.
"Envelope" packing in BOPP film
This way is used to wrap the subjects of regular geometric shape, usually solid, such as BD, DVD, CD, cassette, soap, tea, cosmetics, perfumes, candies, cigarettes, cards, etc., also paper napkins can be packed.
The advantages of this method compared with the rest ones are the most presentable, neat appearance, especially when the point sealing is used, which is mainly used for the packing of luxury perfumes and cosmetics.
The drawback of this packing method is the fact that it is applicable only to the solid products in the form of a parallelepiped; when packing on manual machines the process takes more time, since it requires additional operations to form an envelope; for each definite box size, you should use definite width of film.
The copyright protection law requires to wrap BD, DVD, CD boxes in a film; and the method of packing, whether the "seam" or "envelope", the producers choose themselves taking into account all these described factors.