PACKAGING
Wrapper-type packaging composed of a flexible plastics sheet material in the form of a sack or bag having a front wall and a rear wall, which are located opposite one another and are sealed by a side sealing seam to form a flexible sack-like or bag-like tube, of which the opening is covered by a closure flap which is formed by a projection of the rear wall and is folded onto the front wall at least as far as the opening and is closed by longitudinal sealing and, possibly, transverse sealing or adhesive bonding, the opening having an opening aid, wherein the flexible plastics sheet material is oriented at least uniaxially and optionally is embossed and has a tear-propagation resistance in the machine direction which differs by at least 30% from the tear propagation resistance in the direction transverse to the machine direction.
1 : A wrapper-type packaging composed of a flexible polymeric film in the form of a sack or bag, having a front wall and a rear wall, which are opposite to one another and are sealed in each case by a side sealing seam to form a sack like or bag like tube, of which the opening is covered by a closure flap which is formed by a projection of the rear wall and is folded onto the front wall, and also closed by respectively longitudinal side sealing and optionally transverse sealing or adhesive bonding, and optionally having an opening aid, wherein the flexible polymeric film is comprised of to an extent of at least 50 wt % of polyolefins, has through monoaxially orientation a tear propagation resistance in machine direction which differs by at least 30% in relation to the tear propagation resistance in the direction transverse to the machine direction, measured according to DIN 53356-trouser leg, and the opening aid marks the direction of relatively low tear propagation resistance for opening the packaging without tearing one of the sealed seams.
2 : A wrapper-type packaging as claimed in claim 1 , wherein the at least longitudinally side sealed closure flap projects over the opening of the sack or bag and does not fully cover the front wall of the packaging and the packaging optionally has a marking in the opening direction in the form of a notch or of a barcode.
3 : A wrapper-type packaging as claimed in claim 1 , wherein the closure flap does not fully cover the front wall of the packaging, and the lower edge region of the closure flap is transversely sealed with the longitudinal, unsealed edge region of the opening of the sack or bag in the form of a fin seam, and the fin seam has a notching, extending optionally perpendicular thereto, for marking the direction of opening.
4 : A wrapper-type packaging as claimed in claim 1 , wherein the polymeric film has a draw ratio of at least 1:2 in machine direction.
5 : A wrapper-type packaging as claimed in claim 1 , wherein the polymeric film is comprised to an extent of at least 70 wt % of polyolefins.
6 : A wrapper-type packaging as claimed in claim 1 , wherein the polymeric film contains as polyolefins polyethylenes (PE), optionally LDPE, MDPE, LLDPE, HDPE, polypropylenes (PP) or a mixture of at least two of said polyethylenes.
7 : A wrapper-type packaging as claimed in claim 1 , wherein the polymeric film has at least one layer, optionally at least two layers based on a mixture of polyolefins, at least one barrier layer, optionally at least a barrier layer against gasses, against fats and oils, against migration of low molecular mass organic compounds and/or against moisture.
8 : A wrapper-type packaging as claimed in claim 7 , wherein at least one layer of the polymeric film is based on heat-sealable polyolefins.
9 : A wrapper-type packaging as claimed in claim 7 , wherein the barrier layer of the polymeric film is based on ethylene/vinyl alcohol copolymers, polyvinyl alcohols, polyamides, copolyamides, polyesters and/or a polyether/polyamide block copolymer.
10 : A wrapper-type packaging as claimed in claim 9 , wherein the barrier layer is based on an aliphatic polyamide or (partially) aromatic copolyamide, and optionally based on a copolyamide of ε-caprolactam, isophoronediamine and isophthalic acid units.
11 : A wrapper-type packaging as claimed in claim 1 , wherein the polymeric film has at least a five-layer sequence of
(a) a layer (a) based on a mixture of polyethylenes, and optionally further fillers and auxiliaries,
(b) an adhesion promoter layer (b),
(c) a barrier layer (c) based on a polyamide, or copolyamide,
(d) a further adhesion promoter layer (d), and
(e) a layer (e) based on a mixture of polyethylenes.
12 : A wrapper-type packaging as claimed in claim 1 , wherein the polymeric film has a polymeric film with release effect.
13 : A wrapper-type packaging as claimed in claim 12 , wherein the release effect of the polymeric film is based on an at least partial embossment on at least the inside surface of the polymeric film facing the packaged product.
14 : A wrapper-type packaging as claimed in claim 13 , wherein the embossment of the polymeric film has an embossment elevation of 5 μm, measured according to DIN 53 370 2006.
15 : A wrapper-type packaging as claimed in claim 13 , wherein the embossed polymeric film has a shrinkage of at least 50% lower than the shrinkage of a corresponding unembossed, polymeric film.
16 : A wrapper-type packaging as claimed in claim 12 , wherein the release effect of the polymeric film is based on a release coating on the inside surface of the polymeric film facing a packaged product.
17 : A wrapper-type packaging as claimed in claim 13 , wherein the polymeric film has neither an embossment nor a release coating in the regions of the longitudinal side sealing and of the transverse sealing respectively.
18 : A wrapper-type packaging as claimed in claim 1 , wherein the polymeric film has a total thickness of ≦30 μm.
19 : A wrapper-type packaging as claimed in claim 1 as individual packaging for an article packaged therein.
20 : A wrapper-type packaging as claimed in claim 1 as individual packaging for a self-adhesive article of any kind packaged therein.
21 : A wrapper-type packaging as claimed in claim 1 as individual packaging for a self-adhesive hygiene article.