A type of flat packing strap

Abstract

This invention provides a flat packing strap with a continuous diamond-shaped embossed pattern forming a grid-like texture on its surface. Of the two pairs of vertices of the diamond-shaped embossed pattern, the angle of the smaller pair of vertices ranges from 5° to α to 23°. Of the two diagonals of the diamond-shaped embossed pattern, the longer diagonal extends in the same direction as the length of the embossed flat packing strap. This invention modifies the shape of the diamond-shaped embossed pattern on the surface of the flat packing strap. Tests have shown that this significantly enhances its tensile strength. Simultaneously, during strap feeding, it maintains good coordination with the rollers of the feed and unfeeding pulley system, controlling bumps and maintaining the necessary friction for strap feeding, thus ensuring effective strap feeding and carrying.

Description

Technical Field

[0001] This utility model relates to a packing strap; more particularly to a flat packing strap made of polypropylene or polyester material for use in strapping machines. Background Technology

[0002] Flat strapping made of polypropylene or polyester for strapping machines uses a rolling process to create friction patterns on both sides to increase its friction. Because the rolling operation is continuous feeding and rolling, to ensure balanced force on the strap and prevent deviation, a common friction pattern is a grid pattern on both sides. Through continuous feeding, the strapping passes between two hot-pressing rollers with recessed grid patterns on their surfaces, creating raised grid patterns on both sides. While this provides good friction, the compressed strapping suffers significant strength loss, affecting its tensile strength. When used in strapping machines, the portion of the strapping tightened in one cycle is used to bundle the next item and is tightened again. This increases the risk of the strapping breaking due to insufficient strength or affecting its movement. Utility Model Content

[0003] The purpose of this invention is to provide a flat packing strap that can improve the strength of a flat packing strap with a textured surface while maintaining the same thickness and width. To this end, this invention adopts the following technical solution:

[0004] A flat packing strap has a continuous diamond-shaped embossed pattern forming a grid pattern on its surface. The characteristic feature is that, among the two pairs of vertices of the diamond-shaped embossed pattern, the angle range of the pair of vertices with the smaller angle is 5°≤α≤23°, and among the two diagonals of the diamond-shaped embossed pattern, the extension direction of the longer diagonal is consistent with the length direction of the embossed flat packing strap.

[0005] Furthermore, the apex angles of the diamond-shaped ridges on the front and back sides of the flat packing strap are the same.

[0006] Furthermore, the apex angle range is 10°≤α≤23°.

[0007] Furthermore, the distance L between opposite sides of the rhombus is 0.8 ≤ L ≤ 1.7 mm.

[0008] Furthermore, the thickness δ of the flat packing strap ranges from 0.1 to 1 mm. In this invention, the thickness includes the height of the ribs. The width W of the packing strap ranges from 3 to 13.5 mm.

[0009] Furthermore, the front and back of the strapping tape cooperate with the drive and driven wheels of the feed and retraction pulley assembly of the strapping machine, and with the drive and driven wheels of the tension pulley assembly.

[0010] By adopting the technical solution of this utility model, the shape of the diamond-shaped ridges on the surface of the flat packing strap is changed. Tests have shown that its tensile strength is significantly enhanced. At the same time, during the feeding process, it can still maintain good cooperation with the rollers of the feeding and unfeeding wheel assembly, control the bumps and maintain the friction required for feeding, and ensure the feeding and carrying effect. Attached Figure Description

[0011] Figure 1 This is a front view of the flat packing strap of this utility model.

[0012] Figure 2 This is a rear view of the flat packing strap of this utility model.

[0013] Figure 3 This is a perspective view of the flat packing strap of this utility model.

[0014] Figure 4 This is a schematic diagram showing the flat packing strap of this utility model being used in a strapping machine, in conjunction with the feed pulley assembly and the tension pulley assembly.

[0015] Figure 5 This is a cross-sectional view of the flat packing strap of this utility model. Detailed Implementation

[0016] Referring to the accompanying drawings, the flat strapping material involved in this utility model is made of polypropylene or polyester for use in strapping machines. This type of strapping can be bonded by heat during strapping and is suitable for benchtop strapping machines.

[0017] The flat packing strap 100 has a front side 1 and a back side 2. The surfaces of the front side 1 and the back side 2 are provided with continuous diamond-shaped raised patterns 3 to form a grid-like pattern. The apex angles of the diamond-shaped raised patterns 3 on the front side and the back side are the same.

[0018] Of the two pairs of vertices of the rhomboid embossing 3, the angle range of the pair of vertices with the smaller angle is 5°≤α≤23°, preferably 10°≤α≤23°. Of the two diagonals of the rhomboid embossing 3, the extension direction of the longer diagonal 31 is consistent with the length direction of the embossed flat packing tape.

[0019] The distance L between opposite sides of the rhombus is 0.8 ≤ L ≤ 1.7 mm.

[0020] like Figure 4 As shown, at the feed and return pulley assembly, both sides (front and back) of the strapping are respectively engaged with the driving wheel 21 and driven wheel 22 of the feed and return pulley assembly of the strapping machine. At the tension pulley assembly, both sides (front and back) of the strapping are respectively engaged with the driving wheel 31 and driven wheel 32 of the tension pulley assembly. The friction between the wheels and the strapping surface is used to achieve feeding, retraction, and tensioning of the strapping.

[0021] The technical effects of this utility model will be verified in detail through the following embodiments.

[0022] Example 1: Simulation Experiment

[0023] Experimental tools: The static stress analysis module of SolidWorks was used for analysis.

[0024] Experimental conditions and procedures: The following simulated packing straps were compared. All simulated packing straps had the same width, thickness, and spacing of ribs, and were modeled using the same method. The width was 11mm, the thickness was 0.8mm, the distance between opposite sides of the rhombus L was 1.5mm, and the height H of the ribs was 0.3mm. Only the apex angle of the intersecting rhombus ribs changed in each packing strap. During the experiment, for each simulated packing strap, a starting point was randomly selected, and a 100mm length was cut. One end was fixed, and a force of 2000N was applied to the other end to obtain its maximum stress value (i.e., breaking strength). This group of experiments was numbered 1. Then, the starting point was moved 1mm, a 100mm length was cut, one end was fixed, and a force of 2000N was applied to the other end. This group of experiments was numbered 2. The experiment was repeated by moving the starting point 1mm each time, until the 10th group. The experimental results are shown in Table 1.

[0025]

[0026] As can be seen from this experiment, the packing strap provided by this utility model has good strength consistency in the elongation direction, and all of them have higher strength than the currently commonly used flat packing straps with 40° angled grid convex texture.

[0027] Example 2 Simulation Experiment

[0028] Experimental tools: The static stress analysis module of SolidWorks was used for analysis.

[0029] Experimental conditions and procedures: The following simulated packing straps are compared. All simulated packing straps have the same width, thickness, and spacing of the ribs, and are modeled using the same method. Specifically, the width is 11mm, the thickness is 0.8mm, the distance between opposite sides of the rhombus L is 1.5mm, and the height H of the ribs is 0.3mm. For each packing strap, only the apex angle of the intersecting rhombus ribs changes. During the experiment, for a simulated packing strap with one type of rhombus apex angle, a starting point was randomly selected, a 100mm length was cut, one end was fixed, and a force of 2000N was applied to the other end. The maximum stress value and the maximum displacement value (i.e., the maximum deformation) were obtained. Then, keeping the starting point the same, a different apex angle was used, and the experiment was repeated. The experimental results are shown in Table 2.

[0030]

[0031] According to the formula for effective bearing area, Aeff = F / δmax, under the same force, the larger the maximum stress value, the smaller the effective bearing area and the worse the tensile strength. Therefore, the results of Experiment 1 and Experiment 2 are consistent. The tensile strength of the packing straps using this invention is higher than that of the commonly used 40° angled grid-patterned flat packing straps. Considering both the stability of the strapping and the friction effect with the rollers, an angle of 10° ≤ α ≤ 23° is preferred.

[0032] Example 3: Actual Tensile Test

[0033] Experimental tools: A tensile testing machine of model SHK-A106 was used to test the tensile strength of the packing straps.

[0034] Experimental conditions and procedures: For the parameters of the packing straps in different experimental groups, please refer to the remarks columns in Tables 3.1, 3.2, 3.3, and 3.4. Except for the difference in the rhombus apex angle, all other parameters of the packing straps in different experimental groups were the same. In the actual tensile test, for each type of rhombus apex angle (each group of packing straps), 6 or 8 packing straps with a length of 100mm were randomly cut and tested on a tensile testing machine. The measured width of the packing straps was 10.2mm, and the measured thickness was 0.25-0.3mm. The experimental results are shown in the following table.

[0035] Table 3.1:

[0036]

[0037] Table 3.2

[0038]

[0039] Table 3.3

[0040]

[0041] Table 3.4

[0042]

[0043] As can be seen from the above, in actual finished product testing, the tensile strength of each packing strap using this utility model solution is higher than that of the currently commonly used 40° angled grid embossed flat packing strap.

[0044] The above description is only a specific embodiment of the present utility model, but the structural features of the present utility model are not limited thereto. Any changes or modifications made by those skilled in the art within the scope of the present utility model are covered by the protection scope of the present utility model.

Claims

1. A flat packing tape, the surface of which is provided with continuous diamond-shaped embossing to form a grid-like embossing, characterized in that, Of the two pairs of vertices of the rhomboid ridge, the angle of the pair of vertices with the smaller angle is within the range of 5°≤α≤23°, and of the two diagonals of the rhomboid ridge, the extension direction of the longer diagonal is consistent with the length direction of the flat packing strap.

2. A flat packing strip as claimed in claim 1, wherein, The apex angles of the diamond-shaped raised patterns on the front and back are the same.

3. The flat packing strap as described in claim 1, characterized in that, The angle range of the apex angle is 10°≤α≤23°.

4. A flat packing strap as described in claim 1, characterized in that, The distance L between opposite sides of the rhombus is 0.8 ≤ L ≤ 1.7 mm.

5. A flat packing strap as described in claim 1, characterized in that, Thickness δ range: 0.1≤δ≤1mm, strapping width W range: 3≤W≤13.5mm.

6. A flat packing strap as described in claim 1, characterized in that, The front and back of the strapping tape engage with the drive and driven wheels of the feed and return pulley assembly of the strapping machine, and with the drive and driven wheels of the tension pulley assembly.

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