A heat-seal structure for reinforcing the corner and load-bearing capacity of a plastic bag

Abstract

The utility model provides a kind of plastic bag anti-explosion angle and reinforcing load-bearing heat sealing structure, including the heat sealing line being arranged in the bottom of plastic bag body, heat sealing line is equipped with the first heat sealing arc and the second heat sealing arc of smooth connection, the first heat sealing arc includes the first heat sealing arc angle, the second heat sealing arc angle, the third heat sealing arc angle and the fourth heat sealing arc angle connected in turn, the second heat sealing arc includes the fifth heat sealing arc angle, the sixth heat sealing arc angle, the seventh heat sealing arc angle and the eighth heat sealing arc angle connected in turn, bag body is equipped with first inner fold line and second inner fold line, first inner fold line is located between the second heat sealing arc angle and the third heat sealing arc angle, and second inner fold line is located between the sixth heat sealing arc angle and the seventh heat sealing arc angle.The utility model solves the problem that traditional plastic bag heavy load is easy to explode angle, heat sealing line is easy to tear, improves the use reliability of plastic bag, reduces the risk of article falling due to bag body damage, improves user experience.

Description

Technical Field

[0001] This utility model proposes a heat-sealing structure for a plastic bag with an explosion-proof corner and enhanced load-bearing capacity, belonging to the field of plastic bag structure. Background Technology

[0002] Plastic bags are widely used in daily shopping and product packaging due to their advantages such as lightness, low cost, and good sealing performance. Currently, traditional plastic bags mostly use a straight heat-sealing line at the bottom. When the bag is loaded with heavy objects, the weight is concentrated at the intersection of the heat-sealing line and the inner fold line, resulting in high stress concentration in this area. Because the straight heat-sealing line has a single stress point, the pressure per unit length of the heat-sealing line is too high, making it prone to tearing. Furthermore, the corners at both ends of the inner fold line are particularly prone to stress concentration due to their sharp structure, making them susceptible to corner bursting during lifting or loading, seriously affecting the reliability of the plastic bag. There is an urgent need for an optimized heat-sealing structure that can distribute stress and strengthen key areas through structural design to solve these technical problems. Utility Model Content

[0003] To address the technical problems existing in the prior art, this utility model proposes a heat-sealing structure with an explosion-proof corner and enhanced load-bearing capacity for plastic bags, thereby improving the explosion-proof and load-bearing performance of plastic bags. The technical features adopted are as follows:

[0004] A heat-sealing structure for preventing explosions and enhancing load-bearing capacity in plastic bags includes a heat-sealing line at the bottom of the bag body. The heat-sealing line has a smoothly connected first heat-sealing arc and a second heat-sealing arc. The first heat-sealing arc includes a first heat-sealing arc corner, a second heat-sealing arc corner, a third heat-sealing arc corner, and a fourth heat-sealing arc corner connected in sequence. The second heat-sealing arc includes a fifth heat-sealing arc corner, a sixth heat-sealing arc corner, a seventh heat-sealing arc corner, and an eighth heat-sealing arc corner connected in sequence. The bag body has a first inner fold line and a second inner fold line. The first inner fold line is located between the second heat-sealing arc corner and the third heat-sealing arc corner, and the second inner fold line is located between the sixth heat-sealing arc corner and the seventh heat-sealing arc corner.

[0005] Preferably, a first heat-sealing segment is smoothly connected between the second heat-sealing arc angle and the third heat-sealing arc angle, and a second heat-sealing segment is smoothly connected between the sixth heat-sealing arc angle and the seventh heat-sealing arc angle.

[0006] Preferably, the first and second heat-sealing arc angles in the first heat-sealing arc are connected in opposite directions, and the third and fourth heat-sealing arc angles are connected in opposite directions.

[0007] Preferably, the fifth and sixth heat-sealing arcs in the second heat-sealing arc are connected in opposite directions, and the seventh and eighth heat-sealing arcs are connected in opposite directions.

[0008] Preferably, the first heat-sealing arc angle, the second heat-sealing arc angle, the third heat-sealing arc angle, the fourth heat-sealing arc angle, the fifth heat-sealing arc angle, the sixth heat-sealing arc angle, the seventh heat-sealing arc angle, and the eighth heat-sealing arc angle are all chamfers of 10-40mm.

[0009] Preferably, the lengths of the first heat-sealing segment and the second heat-sealing segment are 5-40 mm.

[0010] Preferably, the straight-line distance between the two endpoints of the first and second heat-sealing arcs is 20-60mm, and the depth is 5-20mm.

[0011] Preferably, the width of the heat-sealing line is not less than 1 mm.

[0012] Preferably, at least two layers of bag body are heat-sealed inside the bag body at the intersection of the heat-sealing line and the inner fold line, and at least four layers of bag body are heat-sealed outside the bag body at the intersection.

[0013] The beneficial effects of this utility model are as follows:

[0014] By optimizing the heat-sealing structure of plastic bags, modifying the limited straight heat-sealing line into a curved shape, improving the multi-segment heat-sealing arc structure, and optimizing the parameter values ​​of the heat-sealing structure, the number of stress-bearing points on the heat-sealing line is increased, the pressure on a unit heat-sealing line is reduced, and the upper limit of the explosion-proof capacity and load-bearing performance of the plastic bag is increased. Under the same material and process conditions, the heat-sealing structure of this utility model improves the explosion-proof effect and load-bearing capacity of plastic bags by more than 20% compared with conventional plastic bag heat-sealing lines, effectively solving the problem of heat-sealing line tearing or corner bursting during use, and improving the safety and practicality of plastic bags. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall structure of the present utility model. Figure 1 .

[0016] Figure 2 This is a schematic diagram of the heat-sealing structure of this utility model. Figure 2 .

[0017] Figure 3 This is a schematic diagram of the heat-sealing structure of this utility model. Figure 3 .

[0018] 1. Bag body; 2. Heat seal line; 21. First heat seal arc; 22. Second heat seal arc; 23. First heat seal line;

[0019] 24, Second heat seal line; 25, Third heat seal line; 211, First heat seal arc angle; 212, Second heat seal arc angle;

[0020] 213, Third heat-sealing arc angle; 214, Fourth heat-sealing arc angle; 215, First heat-sealing segment; 221, Fifth heat-sealing arc angle;

[0021] 222, Sixth heat-sealing arc angle; 223, Seventh heat-sealing arc angle; 224, Eighth heat-sealing arc angle; 225, Second heat-sealing segment;

[0022] 31, First inner fold line; 32, Second inner fold line. Detailed Implementation

[0023] The present invention will be further described below with reference to specific embodiments, but the present invention is not limited to the embodiments.

[0024] In the description of this utility model, it should be noted that the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer" and "vertical" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0025] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; or they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0026] Furthermore, in the description of this utility model, unless otherwise stated, "multiple", "multiple groups", and "multiple roots" mean two or more.

[0027] Unless otherwise specified, the materials, instruments and methods used in the following embodiments are all conventional materials, instruments and methods in the art and can be obtained through commercial channels.

[0028] Example 1

[0029] Figure 1This is a schematic diagram of the structure described in this utility model. The heat-sealing structure includes a continuous heat-sealing line 2 along the width direction at the bottom of the bag body 1. After the two ends of the bag body 1 are folded inward longitudinally, a first inner fold line 31 and a second inner fold line 32 are provided. In this embodiment, there are two inner fold lines. A first heat-sealing arc 21 and a second heat-sealing arc 22 are provided on the heat-sealing line 2. The first heat-sealing arc 21 intersects with the first inner fold line 31, and the second heat-sealing arc 22 intersects with the second inner fold line 32. The first heat-sealing arc and the second heat-sealing arc are integrally formed. Both of the above-mentioned heat-sealing arcs are located at the lower end of the heat-sealing line and are close to the bottom of the bag. The first heat-sealing arc (21) includes a first heat-sealing arc angle (211), a second heat-sealing arc angle (212), a third heat-sealing arc angle (213) and a fourth heat-sealing arc angle (214) connected in sequence. The second heat-sealing arc (22) includes a fifth heat-sealing arc angle (221), a sixth heat-sealing arc angle (222), a seventh heat-sealing arc angle (223) and an eighth heat-sealing arc angle (224) connected in sequence. The first inner fold line (31) is located between the second heat-sealing arc angle (212) and the third heat-sealing arc angle (213). The second inner fold line (32) is located between the sixth heat-sealing arc angle (222) and the seventh heat-sealing arc angle (223). The aforementioned multiple heat-sealing arcs are chamfered corners of multiple transition arcs. The heat-sealing arcs of this utility model are transitioned by arc chamfers, which transforms concentrated stress into dispersed stress along the arc surface, avoiding corner bursting due to stress concentration. The heat-sealing line extends along the fold line direction inside the bag, forming an additional force support point, which works with the main heat-sealing line to bear the weight and reduce the force load per unit length of the heat-sealing line.

[0030] like Figure 3 As shown, in the first heat-sealing arc (21), the first heat-sealing arc angle (211) and the second heat-sealing arc angle (212) are connected in opposite directions, and the third heat-sealing arc angle (213) and the fourth heat-sealing arc angle (214) are connected in opposite directions. In the second heat-sealing arc (22), the fifth heat-sealing arc angle (221) and the sixth heat-sealing arc angle (222) are connected in opposite directions, and the seventh heat-sealing arc angle (223) and the eighth heat-sealing arc angle (224) are connected in opposite directions. In addition, a first heat-sealing line segment (215) is provided between the second heat-sealing arc angle (212) and the third heat-sealing arc angle (213), and a second heat-sealing line segment (225) is provided between the sixth heat-sealing arc angle (222) and the seventh heat-sealing arc angle (223). In addition, when the number of inner fold lines is greater than two, or the plastic bag body is too wide, the number or size of the heat-sealing arc angles and heat-sealing line segments in the heat-sealing structure can be appropriately increased to ensure that the heat-sealing arc in the heat-sealing structure is strengthened and the stress is fully dispersed.

[0031] The first heat-sealing arc angle (211), the second heat-sealing arc angle (212), the third heat-sealing arc angle (213), the fourth heat-sealing arc angle (214), the fifth heat-sealing arc angle (221), the sixth heat-sealing arc angle (222), the seventh heat-sealing arc angle (223), and the eighth heat-sealing arc angle (224) in the first and second heat-sealing arcs are chamfered by 10-40mm, such as 15mm, 20mm, 30mm, or 35mm. In this embodiment, it is 15.5mm. The chamfer within this range ensures the stress dispersion effect without occupying too much space inside the bag, avoiding the imbalance between the two heat-sealing arcs. The rounded transition structure of the heat-sealing arc angles eliminates the stress concentration problem at the intersection of the heat-sealing line and the inner fold line.

[0032] The straight-line distance between the two endpoints of the first heat-sealing arc (21) and the second heat-sealing arc (22) can be selected within the range of 20-60mm, such as 25mm, 30mm, 50mm or 55mm. In this embodiment, the width of the plastic bag is 400mm, and the straight-line distance between the two endpoints of the heat-sealing arc is 35mm. This distance design allows the heat-sealing arc to cover a sufficiently large stress dispersion area without excessively occupying the effective space of the bag. The distance between adjacent heat-sealing arcs is less than 1 / 3 of the overall heat-sealing line length of the plastic bag. This spacing design ensures that the heat-sealing arcs can be effectively distributed along the entire heat-sealing line without excessively affecting the aesthetics of the bag, providing comprehensive anti-explosion corner protection for the plastic bag. In addition, the depth of the first heat-sealing arc (21) and the second heat-sealing arc (22) can be selected within the range of 5-20mm, such as 7mm, 12mm, 15mm or 18mm. In this embodiment, it is 8.5mm. This depth design allows the heat-sealing arc to effectively penetrate into the stress concentration area and play a better stress dispersion role.

[0033] In this embodiment, when the heat-sealing structure has a first heat-sealing segment (215) and a second heat-sealing segment (225) in the two heat-sealing arcs, the first heat-sealing segment (215) and the second heat-sealing segment (225) intersect with the first inner fold line and the second inner fold line respectively. The angle of intersection is a right angle or an acute angle. In this embodiment, they intersect perpendicularly. The heat-sealing segment with the inner fold line heat-seales at least two layers of the bag body towards the inside, and the inner fold line heat-seales at least four layers of the bag body towards the outside. The multi-layer heat-sealing design of the heat-sealing segment enhances the heat-sealing strength of the key stress area and avoids tearing of the heat-sealing line by dispersing the stress. The length of the first heat-sealing segment (215) and the second heat-sealing segment (225) can be adjusted within the range of 5-40mm, for example, it can be 10mm, 15mm, 25mm or 30mm, etc. In this embodiment, it is 10mm. This design allows the heat-sealing segment to effectively disperse stress and prevent excessive stress concentration at a certain point.

[0034] In this embodiment, the heat-sealing structure includes a first heat-sealing line 23, a second heat-sealing line 24, and a third heat-sealing line 25. The three heat-sealing lines are smoothly connected by a first heat-sealing arc 21 and a second heat-sealing arc 22. The heat-sealing structure is an integrally formed heat-sealing line with a width of not less than 1 mm (1.2 mm in this embodiment). This design ensures that the heat-sealing lines and arcs of the heat-sealing structure have sufficient strength to withstand significant tensile force without easily breaking. Furthermore, this thickness is similar to the thickness of the folded bag material. This design ensures the structural stability of the heat-sealed area, ensuring a uniform stress distribution between the heat-sealing arcs and preventing excessive concentration of stress in certain areas. This extends the service life of plastic bags of the same material and size by more than 1.5 times.

[0035] The dimensions of the heat-sealing structure of this utility model can be flexibly adjusted according to the specifications and materials of the plastic bag. It is suitable for tote bags, shopping bags, and packaging bags of different sizes and load-bearing requirements. The processing technology is simple and does not require additional production costs. It solves the problems of easy corner bursting and easy tearing of heat-sealing lines in traditional plastic bags under heavy loads, improves the reliability of plastic bags, reduces the risk of items falling due to bag damage, and enhances the user experience. By matching the dimensions of the heat-sealing structure, the stress of the entire heat-sealing structure is evenly distributed, forming a synergistic effect of triple protection: the main heat-sealing line bears the load, the heat-sealing arc disperses the load, and the heat-sealing line segment is reinforced. This significantly improves the anti-burst corner capability and load-bearing limit of plastic bags of the same material and size, increasing the anti-burst limit of the bag corner by more than 20%. In actual tests, no corner bursting phenomenon was observed when a 400mm wide plastic bag was loaded with 6-10kg of weight.

[0036] Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Anyone skilled in the art can make various modifications and alterations without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention should be determined by the claims.

Claims

1. A heat-sealing structure for a plastic bag with explosion-proof corners and enhanced load-bearing capacity, comprising a heat-sealing line (2) disposed at the bottom of the plastic bag body (1), characterized in that, The heat-sealing line (2) is provided with a first heat-sealing arc (21) and a second heat-sealing arc (22) that are smoothly connected. The first heat-sealing arc (21) includes a first heat-sealing arc angle (211), a second heat-sealing arc angle (212), a third heat-sealing arc angle (213) and a fourth heat-sealing arc angle (214) connected in sequence. The second heat-sealing arc (22) includes a fifth heat-sealing arc angle (221), a sixth heat-sealing arc angle (222), a seventh heat-sealing arc angle (223) and an eighth heat-sealing arc angle (224) connected in sequence. The bag body (1) is provided with a first inner fold line (31) and a second inner fold line (32). The first inner fold line (31) is located between the second heat-sealing arc angle (212) and the third heat-sealing arc angle (213). The second inner fold line (32) is located between the sixth heat-sealing arc angle (222) and the seventh heat-sealing arc angle (223).

2. The heat-sealing structure for explosion-proof corners and enhanced load-bearing capacity of a plastic bag according to claim 1, characterized in that, A first heat-sealing segment (215) is smoothly connected between the second heat-sealing arc (212) and the third heat-sealing arc (213), and a second heat-sealing segment (225) is smoothly connected between the sixth heat-sealing arc (222) and the seventh heat-sealing arc (223).

3. The heat-sealing structure for explosion-proof corners and enhanced load-bearing capacity of a plastic bag according to claim 1, characterized in that, The first heat sealing arc (21) and the second heat sealing arc (212) in the first heat sealing arc (21) are connected in opposite directions, and the third heat sealing arc (213) and the fourth heat sealing arc (214) are connected in opposite directions.

4. The heat-sealing structure for a plastic bag with explosion-proof corners and enhanced load-bearing capacity according to claim 1, characterized in that, The fifth heat sealing arc (221) and the sixth heat sealing arc (222) in the second heat sealing arc (22) are connected in opposite directions, and the seventh heat sealing arc (223) and the eighth heat sealing arc (224) are connected in opposite directions.

5. The heat-sealing structure for a plastic bag with explosion-proof corners and enhanced load-bearing capacity according to claim 1, characterized in that, The first heat-sealing arc (211), the second heat-sealing arc (212), the third heat-sealing arc (213), the fourth heat-sealing arc (214), the fifth heat-sealing arc (221), the sixth heat-sealing arc (222), the seventh heat-sealing arc (223), and the eighth heat-sealing arc (224) are chamfers of 10-40mm respectively.

6. The heat-sealing structure for a plastic bag with explosion-proof corners and enhanced load-bearing capacity according to claim 2, characterized in that, The lengths of the first heat-sealing segment (215) and the second heat-sealing segment (225) are 5-40 mm.

7. The heat-sealing structure for explosion-proof corners and enhanced load-bearing capacity of a plastic bag according to claim 1, characterized in that, The straight-line distance between the two ends of the first heat-sealing arc (21) and the second heat-sealing arc (22) is 20-60mm, and the depth is 5-20mm.

8. The heat-sealing structure for a plastic bag with explosion-proof corners and enhanced load-bearing capacity according to claim 1, characterized in that, The width of the heat-sealing line (2) is not less than 1 mm.

9. The heat-sealing structure for a plastic bag with explosion-proof corners and enhanced load-bearing capacity according to claim 1, characterized in that, At least two layers of bag body are heat-sealed on the inside of the bag body (1) where the heat-sealing line (2) intersects with the inner fold line (3), and at least four layers of bag body are heat-sealed on the outside of the bag body at the intersection.

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