WO2017196194A1

WO2017196194A1 - A retroreflective fluorescent plastic film carrying bag

Info

Publication number: WO2017196194A1
Application number: PCT/PL2017/000046
Authority: WO
Inventors: Piotr CHUPTYŚ
Original assignee: Contissi Spolka Z Ograniczona Odpowiedzialnoscia Spolka Komandytowa
Current assignee: Contissi Spolka Z Ograniczona Odpowiedzialnoscia Spolka Komandytowa
Priority date: 2016-05-09
Filing date: 2017-05-04
Publication date: 2017-11-16
Anticipated expiration: 2018-11-09
Also published as: PL417134A1; PL233224B1

Abstract

The subject of the invention is a retroreflective plastic film carrying bag with handgrips manufactured from flattened plastic film tubing made of polyethylene, preferably of HDPE type with thickness G = 0.05-0.95 μm, and either one or two of the outside surfaces (6) of the front wall (1) and the back wall (2) are provided with at least one retroreflective strip (7) joined permanently with said wall or walls, or at least one retroreflective strip (8) fused into said wall or walls, or one of said walls is covered inseparably with a retroreflective coating (11), the strips or the coating being made of a composition containing 80-99.1 wt% of polyethylene, preferably of HDPE-type, and 0.9-20 wt% of transparent fluorescent dye or pigment, whereas thickness of the inseparably joined retroreflective strips (7) is H - 0.05-0.9 μm, thickness of fused-in retroreflective elements (8) is H2 = 0.06-0.6 μm, and depth of fusing the elements into the walls is H1 = 0.02-0.4 μm, whereas the width of the retroreflective strips (7 and 8) is S = 5-200 mm.

Description

A retroreflective fluorescent plastic film carrying bag

The subject of the invention is a retroreflective plastic film carrying bag with handgrips manufactured from flattened plastic film tubing made of polyethylene with the use of the blowing extrusion method and designed to hold, store, or carry various products as well as advertise goods and/or services.

Known are plastic film carrying bags comprising two side walls made of a plastic film joined with each other along at least two of their opposite edges by means of appropriate pressing surfaces and further joined by means of a lower plastic film insert provided between the side plastic film walls provided with handgrips.

Known are also plastic film advertising bags made of HDPE and LDPE films with thickness of 0.04-0.07 mm with advertising imprints made on them with the use of flexographic or silk screen printing, in particular the bags of "MARKET" type with an upper and a lower fold, side welds, and a handgrip drawn in the upper flange in the form of a "bean".

From description of invention filed in Polish patent application No. P- 397376 known is a plastic film carrying bag comprising two walls made of polypropylene film from the same band of plastic film, with a fold situated between the walls made from the same sheet, , whereas the welds are made on the sides. In the upper part, backings are glued to the two layers of film, in which cut-outs are provided forming a handgrip.

Further, from Polish patent description of the invention filed under No. P- 365415 known is an easily openable film carrying bag made of a plastic, having two overlapping walls, a front wall and a back wall, joined with each other by means of two welts, each of which is formed by two panels with different widths, so that the front wall and the back wall are shifted transversally forming thus two band-shaped side zones between side edges of the back wall and the corresponding side edges of the front wall, whereas the side zones are designed for gripping them and relieving them from each other in order to open the bag.

The objective of the present invention is to provide an all-purpose carrying bag based on exterior shape and handgrip designs known in the prior art, with the function of the bag not limited only to holding and carrying the products, but also allowing to increase safety of people going on foot with such carrying bag, especially during the night-time, and to increase effectiveness of advertising inscriptions placed on such carrying bag.

The retroreflective plastic film carrying bag fabricated from polyethylene film tubing according to the present invention is characterised that it is made of polyethylene film, preferably of HDPE type, with thickness G = 0.05- 0.95 μηι, and one or both of the outside surfaces of the front wall and the back wall of the bag is or are provided with at least one retroreflective strip, joined inseparably with or fused into said wall or walls, or one of said walls is provided with an inseparable retroreflective coating, the strips or the coating being made of a composition containing 80-99.1 wt% of polyethylene, preferably of HDPE type, and 0.9-20 wt% of a transparent fluorescent dye or pigment, whereas the width of the inseparably joined retroreflective strips is H = 0.05-0.9 μιη, and the thickness of the retroreflective elements fused into the wall or walls is H2 = 0.06-0.6 μηι, while the depth of fusing the elements into the wall or walls is HI = 0.02- 0.4 μιη, and the width of the retroreflective strips is S = 5-200 mm. It is favourable when the transparent fluorescent dye has the colouring power in the range 95-100% and when the fluorescent dye is a soluble dye, and the fluorescent pigment is a light-emitting pigment. It is also favourable when the fluorescent pigment is a metallic pigment with particle size from 4 μηι to 10 μπι. It is favourable as well when the strips placed on the front and/or the back wall of the bag are oriented obliquely and tilted to the left or to the right, or when the strips are oriented horizontally and parallel to each other, or when the strips are oriented vertically and parallel to each other, or when the strips are arranged to form the shape of letter "V", or when the strips are placed on inside surfaces of the front and/or the rear wall of the bag. Providing front walls of the bag with retroreflective strips containing a fluorescent dye or glitter in colours ranging from yellow to red producing an effect of phosphorescent light, enhances safety of people who hold such bags in their hands in the night-time, as the bag reflects the light coming from approaching cars. Fluorescent effect of glowing gives the bags an unique and individual look, creating the final decorative effect with additional graphic advertising inscriptions placed on the bags. Moreover, the fluorescent dye used in these retroreflective strips makes the glow both in darkness after illumination occurring either during the daytime or by light bulbs. Further, the use of HDPE-type high density polyethylene for manufacturing the bag, results in significant enhancement of its mechanical strength which allows to reduce thickness of the film.

The subject-matter of the invention is illustrated in its example embodiments on drawings, of which Figs. 1-24 present six variants of a first version of retroreflective plastic film carrying bags with handgrips fixed to the front and to the back wall of each of the bags, whereas Fig. 1 shows a first variant of this first version with single retroreflective strips on each of its two walls in a front view; Fig. 2— the same variant of the bag, in a rear view; Fig. 3 — the same variant of the bag in a top view; Fig. 4— the same variant of the bag in cross-sections along lines A-A of Figs. 1 and 2; Fig. 5— a second variant of the first version of the bag with double retroreflective strips provided only on its front wall, in a front view; Fig. 6— the same variant of the bag in a rear view; Fig. 7— the same variant of the bag in a top view; Fig. 8— the same variant of the bag in cross-section along line A- A of Fig. 5; Fig. 9— a third variant of the first version of the bag with a single retroreflective strip provided only on its front wall and oriented along its diagonal, in a front view; Fig. 10— the same variant of the bag, in a rear view; Fig. 1 1— the same variant of the bag in a top view; Fig. 12— the same variant of the bag in cross-section along line B-B of Fig. 9; Fig. 13— a fourth variant of the first version of the bag with two retroreflective strips situated on its front wall, in a front view; Fig. 14— the same variant of the bag with a single oblique retroreflective strip, in a rear view; Fig. 15— the same variant of the bag, in a top view; Fig. 16— the same variant of the bag, in transverse cross-sections along line A-A of Figs. 13 and 14; Fig. 17 — a fifth variant of the first version of the bag with three vertically oriented retroreflective strips, in a front view; Fig. 18— the same variant of the bag, in a rear view; Fig. 1 — the same variant of the bag, in a top view; Fig. 20 — the same variant of the bag, in cross-section along line B-B of Fig. 17; Fig. 21— a sixth variant of the first version of the bag with eight short retroreflective strips oriented obliquely and parallel to each other only on the front wall, in a front view; Fig. 22— the same variant of the bag in a rear view; Fig. 23— the same variant of the bag in a top view; Fig. 24— the same variant of the bag in cross-section along line A-A of Fig. 21. Figs. 25- 36 present three variants of a second version of retroreflective plastic film carrying bags with holes made in upper portions of their front walls and back walls, said holes functioning as handgrips, of which Fig. 25 shows a first variant of this version with two retroreflective strips oriented obliquely only on its front wall, in a front view; Fig. 26— the same variant of the bag in a rear view; Fig. 27— the same variant of the bag in a top view; Fig. 28— the same variant of the bag in cross-section along line A-A of Fig. 25; Fig. 29— a second variant of the second version of the bag with two horizontal retroreflective strips on its front wall, in a front view; Fig. 30— the same variant of the bag with a single oblique retroreflective strip in its back wall, in a rear view; Fig. 31— the same variant of the bag in a top view; Fig. 32 — the same variant of the bag in cross-section along line B-B of Figs. 29 and 30; Fig. 33— a third variant of the second version of the bag with eight short retroreflective strips oriented obliquely and parallel to each provided on its front wall, in a front view; Fig. 34— the same variant of the bag in a rear view; Fig. 35— the same variant of the bag in a top view; Fig. 36— the same variant of the bag in cross-section along line A-A of Fig. 33. Figs. 37-56 show five variants of a third version of retroreflective plastic film carrying bags with handgrips formed in both of the two folded side walls of the bags, of which Fig. 37 shows a first variant of this version of the bag with retroreflective strips in the form of letter "V" situated on both of its two walls, in a front view; Fig. 38— the same variant, in a rear view; Fig. 39— the same variant of the bag, in a top view; Fig. 40— the same variant of the bag, in cross-section along line A-A of Figs. 37 and 38; Fig. 41— a second variant of the third version of the bag with retroreflective front wall, in a front view; Fig. 42— the same variant of the bag, in a rear view; Fig. 43— the same variant of the bag, in a top view; Fig. 44— the same variant of the bag, in cross-section along line C-C of Fig. 41; Fig. 45— a third variant of the third versions of the bag with two horizontal retroreflective strips, in a front view; Fig. 46— the same variant of the bag in a rear view; Fig. 47— the same variant of the bag in a top view; Fig. 48— the same variant of the 135 bag, in vertical cross-section along line A~A of Fig. 45; Fig. 49— a fourth variant of the third version of the bag with retroreflective strips oriented vertically on its front wall, in a front view; Fig. 50— the same variant of the bag, in a rear view; Fig. 51— the same variant of the bag, in a top view; Fig. 52— the same variant of the bag, in cross-section along line B-B of

140 fig. 49; Fig. 53— a fifth variant of the third version of the bag with obliquely oriented retroreflective strips, in a front view; Fig. 54— the same variant of the bag in a top view; and Fig. 56— the same variant of the bag in cross-section along line A-A of Fig. 53.

Example 1

145 The retroreflective plastic film carrying bag shown in Figs. 1-4 made of a plastic film tubing has a rectangular front wall 1 and a rectangular back wall 2, longer sides of which are joined with each other by means of identical vertically oriented rectangular side walls 3 and 4, whereas upper ends of both of the two walls are provided with handgrips 5 with the profile of letter

150 "U" turned upside down. The front wall, the back wall, and side walls of the bag are made of HDPE-type polyethylene with thickness G = 0.05 μιη, and outside surfaces 6 of the front wall 1 and the back wall 2 are provided with obliquely oriented retroreflective strips 7 with width S = 7 mm and thickness H = 0.05 μηι stretching to the two longer sides of said walls, said strips

155 being permanently joined with these walls with the use of the welding method. The two retroreflective strips are made of a composition containing 99.1 wt% of HDPE-type polyethylene and 0.9 wt% of soluble powder transparent fluorescent dye with strong colouring power of 95%, molecular mass of 336.41, and density of 1.417 g/cm with excellent resistance to UV

160 radiation and high temperature up to 220 °C.

Example 2

The retroreflective plastic film carrying bag shown in Figs. 5-8 made of a flattened plastic film tubing has a rectangular front wall 1 and a rectangular back wall 2, longer sides of which are joined with each other by means of 165 identical vertically oriented rectangular side walls 3 and 4, whereas upper ends of both of the two walls are provide with handgrips 5 with the profile of letter "U" turned upside down. The front wall, the back wall, and side walls of the bag are made of HDPE-type polyethylene with thickness G = 0.10 μηα, and on the outside surface 6 of the front wall 1 are provided with two 170 obliquely oriented parallel retroreflective strips 7 with width S = 5 mm and thickness H = 0.06 μιη which stretch between two longer sides of the wall and are permanently joined with the front wall with the use of welding method. The two strips are made of a composition containing 97% wt% of polyethylene of HDPE type and 3 wt% of soluble powder fluorescent bye of

175 "DT" type producing intense and bright colours, with density of 1.20 g/cm³ and resistance to high temperature up to 260°C.

Example 3

The retroreflective plastic film carrying bag shown in Figs. 9-12 made of a flattened plastic film tubing has a rectangular front wall 1 and a rectangular

180 back wall 2, longer sides of which are joined with each other by means of two identical foldable side walls 3 and 4 which, in the folded state, have the shape of horizontally oriented letter "V", whereas upper ends of both of the two walls are provide with handgrips 5 with the profile of letter "U" turned upside down. The front wall, the back wall, and side walls of the bag are

185 made of LDPE-type polyethylene with thickness Gl = 0.05 μπι, and into the outside surface 6 of the front wall 1 fused is a retroreflective strip 8 with width S = 200 mm, thickness H2 = 0.06 μιη. and fusing depth HI = 0.02 μπι oriented obliquely and along the diagonal of the front wall. The strip is made of a composition containing 98 wt% of MDPE-type polyethylene and 2 wt%

190 of powder soluble fluorescent dye of "DT" producing intense and bright colours with density of 1.20 g/cm³ and resistance to high temperature up to 260°C.

Example 4

The retroreflective plastic film carrying bag shown in Figs. 13-16 made of a 195 flattened plastic film tubing has a rectangular front wall 1 and a rectangular back wall 2, longer sides of which are joined with each other by means of two identically foldable side walls 3 and 4 having, in the folded state, the shape similar to horizontally oriented letter "V", whereas upper ends of both of the two walls are provide with handgrips 5 with the profile of letter "U" 200 turned upside down. The front wall, the back wall, and side walls of the bag are made of HDPE-type polyethylene with thickness G = 0.20 μη , and the outside surface 6 of the front wall 1 is provided with two horizontally oriented strips 7 with width S = 80 mm, parallel to each other and stretching between the two longer sides of the wall, whereas the outside surface 6 of 205 the back wall 2 is provided with a single obliquely oriented retroreflective strip 7 with width S = 120 mm stretching between the two longer sides of the wall, all the retroreflective strips 7 having thickness H = 0.10 μηι and being made of a composition containing 92 wt% of HDPE-type polyethylene and 8 wt% soluble powder fluorescent dye of "DT White" type producing

210 intensive and bright colours.

Example 5

The retroreflective plastic film carrying bag shown in Figs. 17-20 made of a flattened plastic film tubing has a rectangular front wall 1 and a rectangular back wall 2, longer sides of which are joined with each other by means of

215 identical vertically oriented rectangular side walls 3 and 4, whereas upper ends of both of the two walls are provide with handgrips 5 with the profile of letter "U" turned upside down. The front wall, the back wall, and side walls of the bag are made of LDPE-type polyethylene with thickness Gl = 0.50 μηι, and on the outside surface of the front wall 1 there are three

220 retroreflective strips 8 with width S = 50 mm and thickness H2 = 0.60 μπι, fused into the wall at depth HI = 0.40 μηι vertically and parallel along the whole of its length. The strips are made of a composition containing 80 wt% HDPE-type polyethylene and 20 wt% of fluorescent pigment of "Decor pigment— Golden" type emitting visible or invisible light as a result of

225 operation of radiation with short wavelength of the order of 4-5 μιη (e.g. UV rays or X rays).

Example 6

The retroreflective plastic film carrying bag shown in Figs. 21-24 made of a flattened plastic film tubing has a rectangular front wall 1 and a rectangular

230 back wall 2, longer sides of which are joined with each other by means of identical vertically oriented rounded side walls 3 and 4, whereas upper ends of both of the two walls are provide with handgrips 5 with the profile of letter "U" turned upside down. The front wall, the back wall, and side walls of the bag are made of MDPE-type polyethylene with thickness G = 0.95

235 μιτι, and the outside surface of the front wall 1 has eight oriented obliquely and oriented parallel relative to each other strip-shaped rhomboid elements 7 with width S = 5 mm and thickness H = 0.10 μηι which are permanently joined with the front wall with the use of welding method. All these strip elements 7 are made of a composition containing 90 wt% of MDPE-type 240 polyethylene and 10 wt% of fluorescent pigment of„Decor pigment— Perl" type also emitting visible or invisible light.

Example 7

The retroreflective plastic film carrying bag shown in Figs. 25-28 made of a flattened plastic film tubing has a rectangular front wall 1 and a rectangular

245 back wall 2, longer sides of which are joined with each other by means of identical vertically oriented rounded walls 3 and 4, whereas upper ends of the walls are provided with round holes 9 functioning as bag handgrips. All walls of the bag are made of MDPE-type polyethylene with thickness G = 0.80 μπι, and on outside surface 6 of the front wall 1 is provided with two

250 obliquely oriented parallel retroreflective strips 7 with width S = 100 mm and thickness H = 0.7 μιη stretching between the two longer sides of the front wall and permanently joined with the wall with the use of welding method. The two strips are made of a composition containing 90 wt% of HDPE-type polyethylene 10 wt% of soluble powder fluorescent dye of "DT-

255 White" type producing intense and bright colours.

Example 8

The retroreflective plastic film carrying bag shown in Figs 29-32 made of a flattened plastic film tubing has a rectangular front wall 1 and a rectangular back wall 2, longer sides of which are joined with each other by means of

260 identical foldable side walls 3 and 4 which, when folded, have the shape of horizontally oriented letter "V". All walls of the bag are made of LDPE-type polyethylene with thickness Gl = 0.40 μιη, and on the outside surface 6 of the front wall 1 there are two retroreflective strips 7 with width S = 100 mm and thickness H2 = 0.20 μιη each oriented vertically and parallel to each

265 other stretching between the two longer sides of the wall, whereas on the outside surface 6 of the back wall 2 there is a retroreflective strip 7 with width S = 150 mm and thickness H2 = 0.20 μιη oriented obliquely and stretching between the two longer sides of the wall, all of said strips being fused into their respective walls at depth HI = 0.05 μπι. The retroreflective

270 strips 7 are made of a composition containing 97 wt% of LDPE-type polyethylene and 3 wt% of soluble powder fluorescent dye resistant to UV radiation and high temperature up to 220°C. Example 9

The retroreflective plastic film carrying bag shown in Figs. 33-36 made of a 275 flattened plastic film tubing has a rectangular front wall 1 and a rectangular back wall 2, longer sides of which are joined with each other by means of identical vertically oriented rectangular side walls 3 and 4, whereas upper ends of the walls are provided with round holes 9 functioning as bag handgrips. All walls of the bag are made of MDPE-type polyethylene with 280 thickness G = 0.80 μηι, and outside surface 6 of the front wall 1 has eight obliquely and mutually parallel strip-shaped rhomboid elements 7 with width S = 40 mm and thickness H = 0.9 μιη which are permanently joined with the front wall with the use of welding method. All these strip elements 7 are made of a composition containing 90 wt% of MDPE-type polyethylene 285 and 10 wt% of glowing insoluble powder fluorescent pigment of TX 3 type with particle size 10 μηι.

Example 10

The retroreflective plastic film carrying bag shown in Figs. 37-40 made of a flattened plastic film tubing has a rectangular front wall 1 and a rectangular

290 back wall 2, longer sides of which are joined with each other by means of identical vertically oriented rectangular side walls 3 and 4, whereas upper ends of the front wall and the back wall have U-shaped cut-outs, and the side rectangular walls 3 and 4 at height the same as this of said cut-outs, have also narrow cut-outs (not shown on drawings) in the form of a narrow letter

295 "U" turned upside down, said cut-outs functioning as handgrips. The front wall, the back wall, and the side walls as well as handgrips of the bag are made of LDPE-type polyethylene with thickness G = 0.50 μπι, and the two outside surfaces 6 of the front wall 1 and of the back wall 2 are provided with two retroreflective strips 7 with width S - 70 mm and thickness H =

300 0.20 μιη each situated in such a way that the form a shape of letter "V" upper ends of which are adjacent to longer sides of the walls, said strips being joined with the walls by means of the welding method. The two pairs of the strips are made of a composition containing 96 wt% of LDPE-type polyethylene and 4 wt% of colouring concentrate of "Policom" type.

305 Example 1 1

The retroreflective plastic film carrying bag shown in Figs. 41→44 made of a flattened plastic film tubing has a rectangular front wall 1 and a rectangular back wall 2, longer sides of which are joined with each other by means of identical vertically oriented rounded side walls 3 and 4„ whereas upper ends

310 of the front wall and of the back wall have U-shaped cut-outs, and the side rectangular walls 3 and 4, at the height of said cut-outs, have also narrow cut-outs (not shown in drawings) in the form of a narrow letter "U" turned upside down functioning as bag handgrips. The front wall, the back wall, the side wall, and handgrips of the bag are made of HDPE-type with thickness G

315 = 0.40 μηι, and the outside surface 6 of the front wall 1 is provided with retroreflective coating 11 with thickness H = 0.20 μιη joined with the wall with the use of the welding method, which is made of a composition containing 90 wt% of polyethylene and 10 wt% of glowing pigment of the "Decor pigment— TX3" type with particle size 5 μηι.

320 Example 12

The retroreflective plastic film carrying bag shown in Figs. 45^4-8 made of a flattened plastic film tubing has a rectangular front wall 1 and a rectangular back wall 2, longer sides of which are joined with each other by means of identical foldable side walls 3 and 4 which, in folded state, have the shape

325 similar to a horizontally oriented letter "V". The front wall, the back wall, the side wall, and handgrips of the bag are made of LDPE-type polyethylene with thickness Gl = 0.05 μη , and the outside surface 6 of the front wall 1 is provided with two retroreflective strips 7 oriented horizontally and parallel to each other with width S = 150 mm and thickness H - 0.10 μπι, ends of the

330 strips stretching between longer sides of the wall and being permanently joined with each other by means of the welding method. Both of the two strips are made of a composition containing 80 wt% of LDPE-type polyethylene and 20 wt% of glowing fluorescent preparation of TX3 type with particle size 4 μιη.

335 Example 13

The retroreflective plastic film carrying bag shown in Figs. 49-52 made of a flattened plastic film tubing has a rectangular front wall 1 and a rectangular back wall 2, longer sides of which are joined with each other by means of identical vertically oriented side walls 3 and 4, whereas upper ends of the 340 front wall and the back wall have U-shaped cut-outs, and the side rectangular walls 3 and 4, at height the same as this of said cut-outs, have also narrow cut-outs (not shown in drawings) in the form of narrow letter "U" turned upside down functioning as bag handgrips. The front wall, the back wall, the side wall, and handgrips of the bag are made of HDPE-type

345 polyethylene with thickness G = 0.60 μιη, and the outside surface 6 of the front wall 1 is provided with three vertically and mutually parallel retroreflective strips 7, including the two outermost ones extended so that they are present also on the handgrips, the strips having width S = 50 mm and thickness H2 = 0.10 μηι and being fused in the wall to depth HI = 0.02

350 μη . The retroreflective strips 7 are made of a composition containing 97 wt% of polyethylene and 3 wt% of soluble powder transparent fluorescent dye with strong colouring power of 100% and excellent resistance to UV radiation.

Example 14

355 The retroreflective plastic film carrying bag shown in Figs. 53-56 made of a flattened plastic film tubing has a rectangular front wall 1 and a rectangular back wall 2, longer sides of which are joined with each other by means of identical foldable side walls 3 and 4 which, when folded, have the shape similar to a horizontally oriented letter "V". The front wall, the back wall,

360 the side wall, and handgrips of the bag are made of HDPE-type polyethylene with thickness G = 0.90 μηι, and outside surfaces 6 of the front wall 1 and the back wall 2 are provided with obliquely oriented retroreflective strips 7 with width S = 180 mm and thickness H = 0.90 μηι joined with the walls by means of the welding method, said strips being made of a composition

365 containing 85 wt% of HDPE-type polyethylene and 15 wt% of metallic pigment of "Metalic-perl" type with particle size 5 μηι.

In further embodiments of the retroreflective plastic film carrying bag, the retroreflective strips 7 and 8 are placed on the inside surface of the front wall 1 and/or on the inside surface of the back wall 2 of the bag.

370 It is considered obvious that the present invention, especially as far as shapes of the bags and arrangement of retroreflective strips on their front and back walls should not be limited only to its example embodiments described herein and other variants of the invention are also possible without going beyond the subject-matter of the invention defined in its patent claims.

Claims

Patent claims

1. A retroreflective plastic film carrying bag made of polyethylene film tubing having a rectangular front wall and a rectangular back wall, longer sides of which are joined with each other by means of side walls with rectangular, rounded, or folded profile with the shape similar to horizontally oriented letter "V", whereas upper ends of the front wall and the rear wall are provided with handgrips in the form of letter "U" turned upside down, or in the form or circular or elliptical holes, or upper ends of the front and the rear wall are provided with U-shaped cut-outs, and both of the remaining two side parts have rectangular holes in their side walls and function as side handgrips characterised in that it is made of polyethylene, preferably of HDPE-type with thickness G = 0.05-0.95 μηι, and either one or two of the outside surfaces (6) of the front wall (1) and the back wall (2) are provided with at least one retroreflective strip (7) joined permanently with said wall or walls, or at least one retroreflective strip (8) fused into said wall or walls, or one of said walls is covered inseparably with a retroreflective coating (11), the strips or the coating being made of a composition containing 80-99.1 wt% of polyethylene, preferably of HDPE-type, and 0.9-20 wt% of transparent fluorescent dye or pigment, whereas thickness of the inseparably joined retroreflective strips (7) is H = 0.05-0.9 μηι, thickness of fused-in retroreflective elements (8) is H2 = 0.06-0.6 μηι, and depth of fusing the elements into the walls is HI = 0.02-0.4 μιη, whereas the width of the retroreflective strips (7 and 8) is S = 5-200 mm.

2. The carrying bag according to claim 1 characterised in that the transparent fluorescent dye has the colouring power within the range 95- 100%.

3. The carrying bag according to claim 1 or 2 characterised in that the fluorescent dye is preferably a soluble dye.

4. The carrying bag according to claim 1 characterised in that the fluorescent pigment is a light-emitting pigment.

5. The carrying bag according to claim 1 or 4 characterised in that the fluorescent pigment is a metallic pigment with particle size from 4 μπι to 10 μ ι.

6. The carrying bag according to claim 1 characterised in that the retroreflective strip or strips (7 and 8) provided on its front wall (1) and/or on its back wall (2) are oriented obliquely relative to the walls and inclined to the right or to the left.

7. The carrying bag according to claim 1 characterised in that the strips (7 and 8) provided on its front wall (1) and/or on its back wall (2) are oriented horizontally and parallel to each other.

8. The carrying bag according to claim 1 characterised in that the strips (8) provided on its front wall (1) and/or on its back wall (2) are oriented vertically and parallel to each other.

9. The carrying bag according to claim 1 characterised in that the strips (7) provided on its front wall (1) and/or on its back wall (2) are oriented so that they form a shape of letter "V".

10. The carrying bag according to claim 1 characterised in that the retroreflective strips (7 and 8) are provided on inside surfaces of the front wall (1) and/or the back wall (2).