CN216762781U - Plastic bag with double heat sealing lines - Google Patents
Plastic bag with double heat sealing lines Download PDFInfo
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- CN216762781U CN216762781U CN202122501546.3U CN202122501546U CN216762781U CN 216762781 U CN216762781 U CN 216762781U CN 202122501546 U CN202122501546 U CN 202122501546U CN 216762781 U CN216762781 U CN 216762781U
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Abstract
A plastic bag with double heat-sealing lines comprises a cylindrical bag body, wherein a continuous heat-sealing line for bonding two layers of plastic films is arranged at the bottom end of the bag body close to the edge, and is characterized in that a reinforcing heat-sealing line is arranged between the continuous heat-sealing line and the edge. The utility model has the advantages that: the heat-seal line is additionally arranged between the original continuous heat-seal line and the cutting line at the bottom of the bag body and the top of the lifting belt, the increased heat-seal line can effectively prevent the continuous heat-seal lines on the two sides from being pulled open, the firmness of the continuous heat-seal line is greatly improved, and the product quality is ensured from the improvement of the strength of the bottom of the plastic bag and the strength of the lifting belt.
Description
Technical Field
The utility model relates to a plastic bag, wherein the bottom of the bag body and a double-layer plastic film of a lifting belt are connected with each other by adopting double heat sealing lines.
Background
The existing plastic bag is generally in a vest type shape, and the bag making process comprises the following steps: the cylindrical plastic film (raw material) is subjected to heat-sealing and heat-cutting simultaneously by a heat-sealing heat-cutting knife at intervals of one plastic bag, the heat-sealing heat-cutting knife is provided with one heat-cutting knife, and two heat-sealing knives are respectively arranged on two sides of the heat-cutting knife. The hot cutter is a tip used for cutting off the plastic film in a hot cutting line (cutting position); the heat sealing knife is a flat top with a certain width and is used for heat-sealing the two plastic films together to form a continuous heat sealing line. Thus, after heat-sealing and hot-cutting, the raw plastic film is cut into a semi-finished product with the length of the plastic bag, the edges of the two ends of the semi-finished product are hot-cutting lines, and the inner side of each hot-cutting line is a continuous heat-sealing line. And punching a U-shaped notch in the middle of one end of the semi-finished product through the punching process to form a vest-shaped plastic bag finished product. Because the hot cutter moves downwards rapidly to cut off the raw materials, although the hot cutter is heated, the two continuous hot sealing lines can be stretched downwards and upwards in the cutting process, particularly the upper plastic film can be adhered to the upper plastic film to pull the upper plastic film upwards after the two continuous hot sealing lines are cut off, the two plastic films of the continuous hot sealing lines are applied with mutually separated pulling force, the continuous hot sealing lines are not firmly bonded, the firmness of the continuous hot sealing lines can be greatly reduced by the separated pulling force, and the product strength is influenced.
Disclosure of Invention
The utility model provides a plastic bag with double heat sealing lines, which aims to solve the problems in the prior art.
The technical scheme of the utility model is as follows: a plastic bag with double heat-sealing lines comprises a cylindrical bag body, wherein a continuous heat-sealing line for bonding two layers of plastic films is arranged at the bottom end of the bag body close to the edge, and is characterized in that a reinforcing heat-sealing line is arranged between the continuous heat-sealing line and the edge.
The utility model has the advantages that: the heat-seal line is additionally arranged between the original continuous heat-seal line and the cutting line at the bottom of the bag body and the top of the lifting belt, the increased heat-seal line can effectively prevent the continuous heat-seal lines on the two sides from being pulled open, the firmness of the continuous heat-seal line is greatly improved, and the product quality is ensured from the improvement of the strength of the bottom of the plastic bag and the strength of the lifting belt.
Drawings
Fig. 1 is a schematic view of the overall structure of a vest-type plastic bag finished product embodiment (two layers of the bag body are overlapped and laid flat) of the utility model;
FIG. 2 is a schematic view of the processing of the previous embodiment;
FIG. 3 is a schematic view showing the construction of the heat-seal heat-cutter unit used in the production of the above embodiment;
fig. 4 is a schematic view of the overall structure of the finished flat plastic bag of the present invention (two layers of the bag body are laid flat).
Description of reference numerals: A. the bag comprises a cylindrical plastic film, a semi-finished product B, a bag body (finished product) 1, a continuous heat sealing line 2, a heat cutting line 3, a U-shaped notch 4, a heat sealing knife 5, a heat cutting knife 6, a heat cutting knife 7, a base 8, a cross beam 9, a knife holder 10, a reinforced heat sealing line 11 and a lifting belt.
Detailed Description
Referring to fig. 1, an embodiment of a vest-type plastic bag with double heat-seal lines according to the present invention includes a cylindrical bag body 1, a U-shaped notch 4 is formed in the middle of the upper end of the bag body 1, a carrying strip 11 is provided at both ends of the U-shaped notch 4, a continuous heat-seal line 2 for bonding two plastic films (of a cylindrical plastic film a) to each other is respectively provided at the bottom end of the bag body 1 and the top end of the carrying strip 11 near the edge (i.e., a heat-seal line 3), and a reinforcing heat-seal line 10 is provided between the continuous heat-seal line 2 and the edge.
The reinforcing heat sealing line 10 is a point broken line or a continuous line.
The distance between the reinforcing heat sealing line 10 and the continuous heat sealing line 2 is 2-4 mm.
Referring to fig. 2, the processing procedure of the present invention is the same as the prior art, the heat-sealing heat-cutting knife assembly shown in fig. 3 is used to cut and heat-seal the cylindrical plastic film a once downwards under the driving of a driving device (prior art, not shown), a reinforcing heat-sealing line 10 is respectively heat-sealed between two continuous heat-sealing lines 2 and the middle heat-cutting line 3, that is, the cylindrical plastic film a is cut (heat-sealed simultaneously) into semi-finished products B every other plastic bag length, the lifting belts 11 are formed after one end of a plurality of overlapped semi-finished products B is punched out of the U-shaped notch 4 in the subsequent punching process, and the top ends of the two lifting belts 11 and the bottom end of the bag body 1 are both a continuous heat-sealing line 2 and a reinforcing heat-sealing line 10, so as to ensure the strength of the product. The main function of the reinforced heat seal line 10 is to prevent the continuous heat seal line 2 from being affected by the pulling of the heat cutter 6, so that either a point broken line or a continuous line can be adopted to meet the requirement.
The heat-sealing heat-cutting knife assembly shown in fig. 3 is based on the prior art, and a second heat-sealing edge 52 is arranged on the side of the first heat-sealing edge 51 adjacent to the heat-cutting knife 6, and the first heat-sealing edge 51 and the second heat-sealing edge 52 are parallel and spaced from each other.
Fig. 4 is a schematic view showing the overall structure of the two layers of the bag body in a flat-mouth plastic bag finished product embodiment of the utility model in a superposed and flattened state, and the bottom end of the bag body 1 is the same as the previous embodiment except that the upper end is not provided with the U-shaped notch 4, only the flat mouth (the opening which is not closed) is provided with no heat sealing line. The adopted heat-sealing heat-cutting knife component removes a heat-sealing knife 5 in figure 3, and the flat opening of the bag body only needs to be cut off.
Claims (4)
1. A plastic bag with double heat-sealing lines comprises a cylindrical bag body (1), wherein a continuous heat-sealing line (2) for bonding two layers of plastic films is arranged at the bottom end of the bag body (1) close to the edge, and is characterized in that a reinforcing heat-sealing line (10) is arranged between the continuous heat-sealing line (2) and the edge.
2. The plastic bag with double heat-seal lines as claimed in claim 1, wherein a U-shaped notch (4) is formed in the middle of the upper end of the bag body (1), a carrying strip (11) is arranged at each end of the U-shaped notch (4), a continuous heat-seal line (2) for bonding two plastic films is also formed at the top end of the carrying strip (11) close to the edge, and a reinforcing heat-seal line (10) is also formed between the continuous heat-seal line (2) and the edge.
3. The plastic bag with double heat-seal lines as claimed in claim 1, wherein the reinforcing heat-seal line (10) is a point-broken line or a continuous line.
4. A plastic bag with double heat-seal lines according to claim 1, characterized in that the distance between the reinforcing heat-seal line (10) and the continuous heat-seal line (2) is 2-4 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122501546.3U CN216762781U (en) | 2021-10-18 | 2021-10-18 | Plastic bag with double heat sealing lines |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122501546.3U CN216762781U (en) | 2021-10-18 | 2021-10-18 | Plastic bag with double heat sealing lines |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN216762781U true CN216762781U (en) | 2022-06-17 |
Family
ID=81961159
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202122501546.3U Active CN216762781U (en) | 2021-10-18 | 2021-10-18 | Plastic bag with double heat sealing lines |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN216762781U (en) |
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2021
- 2021-10-18 CN CN202122501546.3U patent/CN216762781U/en active Active
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