Easy-to-open Packaging Bag

The present invention discloses an easy-to-open packaging bag, comprising a bag body having a front sheet and a back sheet, wherein a height of the front sheet is smaller than the height of the back sheet, and an entrance of the packaging bag is arranged between an upper edge of the front sheet and an upper edge of the back sheet. A seal tab is arranged on the upper part of the back sheet and above the upper edge of the front sheet and comprises a release film layer and a pull tab from top to bottom in that sequence, wherein the release film layer is bonded with the seal tab via a first adhesive layer; the pull tab with an opening notch comprises a plastic layer bonded with the seal tab via a second adhesive layer, and a tensile strength of the plastic layer is greater than the tensile strength of the bag body. The object of easy opening is achieved by means of arranging a pull tab on the seal tab, with the pull tab being capable of being neatly pulled off.

This application claims priority benefit of CN206750527u, filed on Apr. 19, 2017, the entirety of which being incorporated by reference herein.

FIELD OF INVENTION

The present invention relates to a packaging bag, and relates in particular to an easy-to-open packaging bag.

BACKGROUND ART

With prevalence of E-commerce and blooming of express delivery, packaging bags are required for ever more commodities. The situations facing a prior art packaging bag are either use of waste plastic or laborious inconvenience in being opened and sometimes requiring a pair of scissors or such like tools. Both situations would result in: 1. inconvenience and difficulty in opening the bag; 2. damage to packaged documents; 3. waste of time in procuring a pair of scissors; 4. quick temper and ill mood resulted therefrom. Therefore, an easy-to-open packaging bag is in urgent need.

SUMMARY OF THE INVENTION

To solve the above technical problems, the present invention presents an easy-to-open packaging bag for achieving the object of fast opening.

In order to achieve the object of fast opening, the technical solution of the present invention is as follows:

An easy-to-open packaging bag, comprises a bag body having a front sheet and a back sheet, wherein a height of the front sheet is smaller than the height of the back sheet, and an entrance of the packaging bag is arranged between an upper edge of the front sheet and an upper edge of the back sheet. A seal tab is arranged on the upper part of the back sheet and above the upper edge of the front sheet and comprises a release film layer and a pull tab from top to bottom in that sequence, wherein the release film layer is bonded with the seal tab via a first adhesive layer; the pull tab comprises a plastic layer, the plastic layer is bonded with the seal tab via a second adhesive layer, an opening notch is arranged on the pull tab, and a tensile strength of the plastic layer is greater than a tensile strength of the bag body.

In actual usage, the content in subject is put into the packaging bag from the entrance, the release film layer is peeled off to reveal the first adhesive layer, via which the seal tab is bonded with the front sheet; while in opening the packaging bag, all is needed is just to get hold of the opening notch with one hand and to pull off the pull tab with another, requiring no pair of scissors while saving needless efforts.

Preferably, the material of the bag body, of the release film layer and of the plastic layer is plastic.

Preferably, the width of the plastic layer is 1-10 mm and the thickness thereof is 0.01-0.2 mm.

Preferably, the width of the release film layer is greater than the thickness of the first adhesive layer.

Preferably, the width of the plastic layer is equal to the thickness of the second adhesive layer.

Preferably, the shape of the opening notch is circular, elliptic, rectangular or fan-shaped.

Preferably, the width of the opening notch is greater than or equal to the width of the pull tab.

Preferably, a cross section of the opening notch is either detached or in dashed line.

Preferably, a guide slit is respectively arranged at either side of two slitting directions of the opening notch.

Preferably, the length of the opening notch is 10-30 mm.

Advantageous Effects

The present invention achieves the object of easy opening by means of arrangement of the pull tab, which is pulled off along the guide slits in actual opening. In addition, due to the plastic layer on the pull tab having a thickness and tensile strength bigger than the neighboring material thereof, the pull tab is pulled off neatly.

EMBODIMENTS

As shown inFIGS. 1 and 2, an easy-to-open packing bag, comprises a bag body having a front sheet10and a back sheet20, wherein a height of the front sheet10is smaller than the height of the back sheet20, and an entrance of the packaging bag is arranged between an upper edge of the front sheet10and an upper edge of the back sheet20. A seal tab1is arranged on the upper part of the back sheet20and above the upper edge5of the front sheet10and comprises a release film layer2and a pull tab3from top to bottom in that sequence. A sectional view of the easy-to-open packaging bag along the center A-A thereof is shown inFIG. 2, wherein the seal tab1comprises a release film layer2and a pull tab3from top to bottom in that sequence, wherein the release film layer2is bonded with the seal tab1via the first adhesive layer; the pull tab3comprises a plastic layer, the plastic layer is bonded with the seal tab1via a second adhesive layer, an opening notch4is arranged on the pull tab3, and a tensile strength of the plastic layer is greater than a tensile strength of the bag body

The material of the bag body, of the release film layer and of the plastic layer is plastic, wherein the width of the release film layer is greater than the thickness of the first adhesive layer, and the width of the plastic layer is equal to the thickness of the second adhesive layer. The opening notch4can be arranged at either end or both ends of the pull tab3, withFIG. 11depicting the case of the opening notch4being arranged at both ends of the pull tab3; arrangement of the opening notch4at the left or right end is to suit right-handedness or left-handedness respectively. The width of the opening notch4is greater than or equal to the width of the pull tab3. A cross section of the opening notch4is either detached or in dashed line. In the case of the detached cross section, it intersects with the seal tab1, the second adhesive layer, and the plastic layer, i.e., all the three layers are sliced. In the case of the dashed line cross section, not all the three layers are sliced. The guide slits6are respectively arranged on both sides of the opening notch4at the end of the peeling direction thereof (withFIG. 12depicting the case of the peeling direction in the right side), and the distance between the two guide slits6is greater than or equal to the width of the plastic layer, with a width 1 mm for the plastic layer and a thickness of 0.01 mm therefor being a good choice for easy opening. Also required is a suitable tensile strength of the plastic layer, with a weak tensile strength thereof resulting in possible broken pull tab in pulling off the pull tab. A length of 10 mm for the opening notch is a right choice for easy manipulation.

The shape of the opening notch4is circular, elliptic, rectangular or fan-shaped. An elliptic or rectangular opening notch has the advantages of reducing the height of the opening notch and the seal tab, and of saving in material, in addition to convenience in usage. A rectangular opening notch4is shown inFIG. 3, a fan-shaped opening notch4is shown inFIG. 4, an elliptical opening notch4is shown as inFIG. 5, and a circular opening notch4is shown as inFIG. 6.

The present invention achieves the object of easy opening by means of arrangement of the pull tab3, which in actual opening is pulled off along the guide slits in the slitting direction. In addition, due to the plastic layer on the pull tab3having a thickness and tensile strength bigger than the neighboring material thereof, the pull tab3is pulled off neatly and with ease.FIG. 7shows the easy-to-open packaging bag in working. The seal tab1was previously folded along the upper edge5of the front sheet10and bonded with the front sheet10via the first adhesive layer subsequent to peeling off of the release film layer2.FIG. 7shows pulling off of the pull tab3to a half course in actual opening of the easy-to-open packaging bag. As can be seen therein, the pull tab3and the opening notch4are in a perfect and neat condition, while the opened easy-to-open packaging bag would still be fit to serve for reuse, e.g., as a garbage bag.

FIG. 8shows a packaging bag of the prior art, comprising a front sheet10and a back sheet20, withFIG. 9depicting a sectional view thereof along the center B-B thereof. A seal tab of the packaging bag of the prior art comprises a release film layer and an adhesive layer. Subsequent to putting content in subject into the packaging bag, the release film layer is peeled off, and the seal tab1is folded to the front sheet10along the upper of the front sheet and bonded with the front sheet10via the adhesive layer after pulling off the release film layer. As can be seen fromFIG. 10, compared with the easy-to-open packaging bag of the present invention, the packaging bag of the prior art has following defects: the seal tab1tends to stick to the front sheet, the pull tab is prone to breakage in opening the packaging bag, the opening process is difficult and sometimes requiring a pair of scissors or such like tools, the packaging bag becomes formless in the opening process and would not serve for reuse.

In the current embodiment, the easy-to-open packing bag of the present invention is the same as that in Embodiment 1, except that the width of the plastic layer is 5 mm, the thickness thereof is 0.1 mm, and the length of the opening notch4is 20 mm.

In the current embodiment, the easy-to-open packing bag of the present invention is the same as that in Embodiment 1, except that the width of the plastic layer is 10 mm, the thickness thereof is 0.2 mm, and the length of the opening notch4is 30 mm.