Composite PET plastic steel belt

Abstract

The invention relates to the technical field of PET plastic steel belts, in particular to a composite PET plastic steel belt which comprises a base layer, a middle layer and a surface layer, the middle layer is connected with the base layer and the surface layer through hot melting press fit and sequentially distributed along the surface layer, the middle layer and the base layer from top to bottom, the width of the base layer, the width of the surface layer and the width of the middle layer are gradually increased, and the base layer and the surface layer are longitudinally arranged. The middle layer is obliquely arranged, tearing openings are intermittently formed in the base layer and the surface layer, the tearing openings in the base layer and the tearing openings in the surface layer are staggered, the firmness of the PET plastic steel belt in the binding process is improved through the structural design that the three layers are stacked, and meanwhile convenient disassembly and edge wrapping are provided through the tearing openings in different positions; and therefore, the use convenience of the PET plastic steel belt and the object protection property are improved.

Description

Technical Field

[0001] The invention relates to the technical field of PET plastic-steel belts, in particular to a composite PET plastic-steel belt. Background Art

[0002] Composite PET plastic-steel strapping, also known as PET strapping tape or plastic-steel strapping tape, is a polyester strapping tape made of polyethylene terephthalate (PET) as the main raw material, which is formed through a specific extrusion and unidirectional stretching process. It can be produced in different widths according to different usage requirements. The material exhibits excellent tensile resistance and solid strength when used. The overall performance is very stable and can withstand long-term stress. As a new type of environmentally friendly packaging material, it can effectively replace traditional strapping tapes such as steel belts and steel wires to meet packaging needs.

[0003] The existing PET plastic steel belt is generally directly used in the packaging process. However, during the use, the overall lateral tensile strength of the PET plastic steel belt is insufficient. When exposed to high-intensity sunlight and oxidation, the overall structure is easily delaminated and segmented when subjected to lateral force, which makes the original PET plastic steel belt narrower in use. On the one hand, when used and subjected to increased force, the overall tensile strength is easily weakened due to the delamination position, resulting in easy breakage and damage positions. On the other hand, the PET plastic steel belt will cause a certain amount of extrusion on the objects to be packaged. At this time, if the width is narrowed, the local pressure of the packaged objects will be increased, thereby causing damage to the packaged objects (such as paper boxes or wooden boards, etc.);

[0004] In order to solve the above problems, the prior art proposes a variety of solutions, such as a composite PET plastic-steel belt with patent number CN117601538A, which is provided with a mesh-shaped anti-stretching wire strip, connecting rings are provided at both ends, and a winding cross-positioning is used to form an interconnected whole between adjacent mesh-shaped anti-stretching wire strips, thereby improving the anti-stretching effect during use. At the same time, the connecting wire strips reserve gaps so that adjacent mesh-shaped anti-stretching wire strips are independent of each other, which is convenient for the plastic-steel belt to be cut in sections from here, thereby improving the overall anti-stretching effect of the plastic-steel belt and the ease of disassembly. However, in this process, the interwoven mesh structure will make the edge of the plastic-steel belt uneven, and the plastic-steel belt will also form friction with the object after being bound to the object, and then it is difficult to ensure the stability of the plastic-steel belt during the bundling process by using friction cutting, thereby affecting the firmness of the plastic-steel belt packaging and the protection of the packaged object.

[0005] Based on this, in order to solve the problem that the PET plastic-steel belt needs to ensure its firmness when packaging objects, while avoiding the problem that the PET plastic-steel belt is difficult to disassemble when it needs to be disassembled after packaging, the present invention designs a composite PET plastic-steel belt. Summary of the invention

[0006] The composite PET plastic-steel belt provided by the present invention solves the problem that the PET plastic-steel belt needs to be ensured to be firm when packaging objects, while avoiding the problem that the PET plastic-steel belt is difficult to disassemble when it is needed after packaging; the firmness of the PET plastic-steel belt in the bundling process is improved through the three-layer superimposed structural design, and at the same time, tearing edges at different positions are used to provide convenient disassembly and edge wrapping, thereby improving the convenience of using the PET plastic-steel belt and the protectiveness of the object.

[0007] In order to achieve the above object, the present invention provides the following technical solutions:

[0008] The present invention provides a composite PET plastic-steel belt, comprising a base layer, a middle layer and a surface layer, wherein the middle layer is connected to the base layer and the surface layer respectively by hot-melt pressing, and is distributed along the surface layer, the middle layer and the base layer from top to bottom in sequence, the widths of the base layer, the surface layer and the middle layer gradually decrease, the base layer and the surface layer are arranged longitudinally, the middle layer is arranged obliquely, tear notches are equidistantly provided on the base layer and the surface layer, the tear notches on the base layer and the tear notches on the surface layer are misaligned, the base layer and the surface layer are relatively bent along the tear notches and the middle layer is fixed in a wrapping manner, the base layer and the surface layer are unfolded through different tear notches to expose the obliquely separable middle layer, the misaligned tear notches can, on the one hand, make the edges of the base layer and the surface layer wrap around each other along the tear notches, thereby improving the protection of the edge of the composite plastic-steel belt, and on the other hand, can provide peeling of different areas when the plastic-steel belt needs to be disassembled, thereby separating the plastic-steel belt without external tools.

[0009] Preferably, the middle layer is divided into a connecting portion and an installing portion, the installing portion is located at the center of the connecting portion, a separation mark is pressed on the connecting portion, and the installing portion provides space for the mutual connection between the base layer and the surface layer, thereby ensuring the integrity of the base layer and the surface layer in the initial state.

[0010] Preferably, the surface layer is provided with convex strips, which are equidistantly distributed on the lower surface of the surface layer, and the base layer is provided with connecting strips, which correspond to the mounting portion, and the center of the connecting strip is provided with an embedding groove equal to the size of the convex strip. The connection between the convex strip and the surface layer is preferably an integrally formed type, that is, during the processing, the surface layer can be directly provided with the convex strip and the side limiting strips by hot-melt extrusion, which can improve the overall firmness on the one hand, and facilitate processing and production on the other hand, avoiding the need for additional bonding.

[0011] Preferably, limiting strips are symmetrically installed on both sides of the convex strip, and limiting grooves are provided on both side transverse surfaces of the embedding groove, which cooperate with each other to achieve fixation.

[0012] Preferably, the cross-section of the limiting strip is an inverted triangle, and the cross-section of the limiting groove is a corresponding inverted triangle. The plastic-steel belt is made of plastic material and can thus undergo a certain degree of deformation. Therefore, the limiting strip can be embedded in the limiting groove under sufficient pressure.

[0013] Preferably, the area between the two tear cuts on the surface layer is divided into a top and an inner bending portion, and the area between the two tear cuts on the base layer is divided into an outer bending portion and a bottom. The bending area of ​​the outer bending portion is larger than the bending area of ​​the inner bending portion, and the outer bending portion is folded upward to wrap the inner bending portion. At this time, even if a person holds it with his hand, he will be wrapped by the outer bending portion and will not be injured.

[0014] Preferably, an array of glue injection holes is provided on the inner bending portion, and a glue injection block is installed on the inner surface of the outer bending portion, thereby improving the convenience of bonding and fixing.

[0015] Preferably, the glue injection block is provided with a glue injection port, which is a concave spherical surface to prevent hot melt glue from flowing out of the glue injection hole. At the same time, the glue injection port can be placed in advance without causing the glue to scatter, thereby improving the convenience of glue injection.

[0016] The beneficial effects of the present invention are as follows:

[0017] 1. A composite PET plastic-steel belt proposed in the present invention is formed into three different layers of plastic-steel belts by hot-melt extrusion, namely a base layer, a middle layer and a surface layer. The overall firmness of the composite plastic-steel belt is increased by stacking the three layers, thereby improving its rigidity. The product is cut into strips obliquely and then spliced ​​with the base layer and the surface layer. The spliced ​​plastic-steel belt has strong tensile resistance. The staggered tear can make the edges of the base layer and the surface layer wrap around each other along the tear, that is, the inner bending part wraps the middle layer, and the outer bending part wraps the inner layer, thereby improving the protection of the edge of the composite plastic-steel belt. On the other hand, when the plastic-steel belt needs to be disassembled, it can provide peeling of different areas, thereby separating the plastic-steel belt without external tools.

[0018] 2. The composite PET plastic-steel belt proposed by the present invention has a connection portion that can be disassembled through a separation mark, and the plastic-steel belt can be broken along the separation mark, making it easy to disassemble; the convex strips are embedded in the embedding grooves and then intertwined with each other, and will not be easily torn off by external objects at this time. At the same time, it can also improve the bonding strength between the surface layer, the middle layer and the base layer, avoiding the separation of the three during the bundling process, resulting in the loosening of the plastic-steel belt.

[0019] 3. A composite PET plastic-steel belt proposed by the present invention first folds the inner bending part before the outer bending part wraps the inner bending part. At this time, the glue injection hole on the inner column leaks out. At this time, the hot melt glue to be coated can be squeezed into the glue injection hole, and then the outer bending part that is wrapped around the other end is folded downward. The glue injection block on the outer bending part enters the glue injection hole and fits with the hot melt glue at this time, thereby forming a fixing effect, realizing head and tail fixation, and improving the fixing effect of the plastic-steel belt. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the specific implementation mode of the present invention or the technical solution in the prior art, the drawings required for use in the specific implementation mode or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are one implementation mode of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0021] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0022] Figure 2 is an exploded schematic diagram of the present invention;

[0023] Figure 3 yes Figure 2 The enlarged view of point A in the middle;

[0024] Figure 4 It is a half-section schematic diagram of the present invention;

[0025] Figure 5 yes Figure 4 The enlarged view of point B in the middle;

[0026] Figure 6 It is a state diagram of the present invention when it is working;

[0027] Figure 7 yes Figure 6 Enlarged view of point C in the middle;

[0028] Figure 8 yes Figure 6 Enlarged view of point D in the middle.

[0029] In the figure: 1. base layer; 11. connecting strip; 12. embedding groove; 122. limiting groove; 13. outer bending part; 131. glue injection block; 132. glue injection port; 14. bottom; 2. middle layer; 21. connecting part; 22. installation part; 23. separation mark; 3. surface layer; 31. convex strip; 311. limiting strip; 32. top; 33. inner bending part; 331. glue injection hole; 4. tear notch. DETAILED DESCRIPTION

[0030] In order to better understand the above solution, the above technical solution is described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0031] like Figure 1 As shown, a composite PET plastic-steel belt provided by the present invention includes a base layer 1, a middle layer 2 and a surface layer 3, wherein the middle layer 2 is connected to the base layer 1 and the surface layer 3, and the connection can be made by extrusion to fix the three layers together, and are distributed along the surface layer 3, the middle layer 2 and the base layer 1 from top to bottom, and the widths of the base layer 1, the surface layer 3 and the middle layer 2 gradually decrease, the base layer 1 and the surface layer 3 are arranged longitudinally, and the middle layer 2 is arranged obliquely, and tear notches 4 are equidistantly provided on the base layer 1 and the surface layer 3, and the tear notches 4 on the base layer 1 are misaligned with the tear notches 4 on the surface layer 3, the base layer 1 and the surface layer 3 are relatively bent through the tear notches 4 and the middle layer 2 is fixed in a wrapped manner, and the base layer 1 and the surface layer 3 are unfolded through different tear notches 4 to expose the obliquely separable middle layer 2.

[0032] During the initial processing, three different layers of plastic-steel belts are formed by hot-melt extrusion, namely base layer 1, middle layer 2 and surface layer 3. The overall firmness of the composite plastic-steel belt is increased by superimposing the three layers. The three layers are superimposed in that the base layer 1 and the surface layer 3 are longitudinal textures, while the middle layer 2 is oblique texture. The staggered superposition prevents the lack of tensile strength in a certain direction, thereby improving its rigidity. The base layer 1 and the surface layer 3 are longitudinally arranged in strips or filaments by hot-melt extrusion, that is, they have strong tensile resistance and strength in the length direction, while the middle layer 2 has strong tensile resistance and strength in the oblique direction. Similarly, it is easy to separate when perpendicular to the oblique direction. The middle layer 2 can be in After the planar plastic-steel belt is hot-melt formed, it is cut obliquely into strips and then spliced ​​with the base layer 1 and the surface layer 3. The spliced ​​plastic-steel belt has strong tensile resistance. The offset tear 4 can, on the one hand, make the edges of the base layer 1 and the surface layer 3 bend along the tear 4 at opposite surfaces, and fix the middle layer 2 in a wrapped manner, thereby improving the protection of the edge of the composite plastic-steel belt. On the other hand, when the plastic-steel belt needs to be disassembled, it can provide peeling of different areas, and thus the plastic-steel belt can be separated without external tools. At the same time, the oblique separation of the middle layer 2 can also make it difficult to reassemble without external tools, preventing lawless elements from disassembling and reinstalling privately, thereby protecting the convenient disassembly and protection of the wrapped objects.

[0033] like Figure 2-3 As shown, the middle layer 2 is divided into a connecting portion 21 and a mounting portion 22 . The mounting portion 22 is located at the center of the connecting portion 21 . A separation mark 23 is pressed on the connecting portion 21 .

[0034] The connecting portion 21 is formed into oblique blocks under the action of the separation mark 23. After the surface layer 3 and the base layer 1 are opened, the connecting portion 21 can be disassembled through the separation mark 23, and then the plastic-steel belt can be broken along the separation mark 23, which is convenient for disassembly. The mounting portion 22 provides space for the mutual connection between the base layer 1 and the surface layer 3, so as to ensure the integrity of the base layer 1 and the surface layer 3 in the initial state. When the external force on the base layer 1 or the surface layer 3 is small, the base layer 1 and the surface layer 3 are protected by the mounting portion 22, that is, they are integral, and will not be easily separated, thereby improving the integrity of the composite plastic-steel belt.

[0035] like Figure 4-5 As shown, the surface layer 3 is provided with convex strips 31 which are evenly spaced on the lower surface of the surface layer 3 , and the base layer 1 is provided with connecting strips 11 which correspond to the mounting portion 22 , and the center of the connecting strip 11 is provided with an embedding groove 12 which is equal to the size of the convex strips 31 .

[0036] The convex strip 31 and the connecting strip 11 are structures that are directly opposite to the surface layer 3 and the base layer 1. The connection relationship between the convex strip 31 and the surface layer 3 is preferably an integral molding type, that is, during the processing, the surface layer 3 can be directly provided with the convex strip 31 and the side limiting strip 311 by hot melt extrusion. On the one hand, it can improve the overall firmness, and on the other hand, it is convenient for processing and production, avoiding the need for additional bonding. The convex strip 31 is embedded in the embedding groove 12 and then intertwined with each other. At this time, it will not be easily torn off by external objects. At the same time, it can also improve the bonding strength between the middle layer 2 of the surface layer 3 and the base layer 1, avoiding the separation of the three during the bundling process, resulting in the loosening of the plastic steel belt.

[0037] The two sides of the convex strip 31 are symmetrically mounted with limit strips 311, and the two lateral sides of the embedding groove 12 are provided with limit slots 122. The cross section of the limit strip 311 is an inverted triangle, and the cross section of the limit slot 122 is a corresponding inverted triangle. When the locking cam 311 is in a state of being pressed against the locking cam 312, the locking cam 312 will be in a state of being pressed against the locking cam 312, and the locking cam 312 will be in a state of being pressed against the locking cam 312.

[0038] After the surface layer 3, the middle layer 2 and the base layer 1 are fitted together under the action of the limiting block and the limiting groove 122, the composite plastic-steel belt as a whole is difficult to be disassembled, and the taking and use of the composite plastic-steel belt will make the three layers work together, so when it is not disassembled, no work will be done to the surface layer 3 or the base layer 1 alone, and it will not easily fall off or cause the phenomenon of accidental touch, thereby improving the overall stability of the plastic-steel belt.

[0039] like Figure 6-8 As shown, the area between the two tears 4 on the surface layer 3 is divided into a top 32 and an inner bending portion 33, and the area between the two tears 4 on the base layer 1 is divided into an outer bending portion 13 and a bottom 14, and the bending area of ​​the outer bending portion 13 is greater than the bending area of ​​the inner bending portion 33.

[0040] When in use, the inner bending portion 33 is first folded downward, so that the inner bending portion 33 can fit the middle layer 2, and then the outer bending portion 13 is folded upward to wrap the inner bending portion 33. At this time, even if a person holds it with his hand, he will not be injured under the wrapping of the outer bending portion 13. The outer bending portion 13 can keep the edge of the entire plastic-steel belt smooth, thereby playing a protective role. The bottom 14 and the lower surface of the outer bending portion 13 can be a smooth flexible material. Specifically, the material selection of the base layer 1 during the processing of the plastic-steel belt can be set, such as high-quality raw materials and adding a certain toughening agent to make it relatively soft. At the same time, surface treatment can be performed in the later stage, so that when the hand extracts the object protected by the plastic-steel belt from the center or grabs the object from both sides, the pressure increases due to the small cross-sectional area. The soft base layer 1 can provide certain protection for the hand, thereby facilitating transportation.

[0041] The inner bending portion 33 is provided with an array of glue injection holes 331, and a glue injection block 131 is installed on the outer surface of the outer bending portion 13. The glue injection block 131 is provided with a glue injection port 132, and the glue injection port 132 is an inner concave spherical surface.

[0042] Before the outer bending portion 13 wraps the inner bending portion 33, the inner bending portion 33 is first folded, and the glue injection hole 331 on the inner column leaks out. At this time, the hot melt glue to be applied can be squeezed into the glue injection hole 331, and then the outer bending portion 13 that has been wrapped around the other end is folded downward, and the glue injection block 131 on the outer bending portion 13 enters the glue injection hole 331, just fitting with the hot melt glue at this time, thereby forming a fixing effect, and achieving head and tail fixation. Here, the glue injection holes 331 need to be evenly distributed, and the glue injection blocks 131 are the same. The outer bending portion 13 at the cutoff point needs to be folded in the opposite direction to wrap the inner bending portion 33 at the other end, thereby forming a fixation; the glue injection port 132 is an inwardly concave spherical surface, and the hot melt glue can be squeezed into the glue injection port 132 at this time to avoid flowing out after squeezing into the glue injection hole 331, causing the problem of difficulty in fixing.

[0043] The working principle of the present invention is as follows: the initially produced base layer 1, middle layer 2 and surface layer 3 are each integrally formed, and after the production is completed, they are installed by extrusion layer by layer, and finally a strip of plastic-steel belt is obtained by cutting. When it is necessary to pack, part of the plastic-steel belt is cut off, packed and connected end to end. When connected, one end is located at the bottom and the other end is located at the top. The inner bending portion 33 of the surface layer 3 at the bottom end is folded down along the tearing notch 4, thereby fixing the base layer 1, the middle layer 2 and the surface layer 3. At this time, hot melt adhesive is applied to the outer bending portion 13 of the base layer 1 at the top end, which can be directly applied to the glue injection port 132, and the outer bending portion 13 of the base layer 1 at the top end is folded down. At this time, the glue injection block 131 just corresponds to the glue injection port 132, thereby achieving fixation; when it is necessary to hold the middle section, the inner bending portion 33 of the middle section can be folded down along the tearing notch 4, and the outer bending portion 13 at the bottom is folded up first, thereby wrapping the middle section to avoid scratching the hand by the edge.

[0044] When disassembly is required, the surface layer 3 is torn open through the adjacent tearing slit 4 with glue injected at the upper end, and the middle layer 2 and the base layer 1 are exposed. The connecting strip 11 on the base layer 1 is squeezed downward, and the middle layer 2 is then broken along the separation mark 23. At this time, the constraints between the base layer 1, the middle layer 2 and the surface layer 3 are released, and the surface layer 3 at the upper end of the glue and the base layer 1 at the lower end are connected by two disconnected plastic-steel belts. At this time, they can be untied and fixed along one end, and the plastic-steel belt will not be used again, thereby avoiding secondary packaging and affecting the privacy of the items.

[0045] The basic principles and beneficial effects of the present invention are shown and described above. At the same time, the present invention is not limited to the above embodiments. Without departing from the effects and scope of the present invention, the present invention may have various changes and improvements. These changes and improvements all fall within the scope of the present invention to be protected. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A composite PET plastic-steel belt, characterized in that: The invention comprises a base layer (1), a middle layer (2) and a surface layer (3), wherein the middle layer (2) is connected to the base layer (1) and the surface layer (3) respectively and is arranged along the surface layer (3), the middle layer (2) and the base layer (1) from top to bottom in sequence, the widths of the base layer (1), the surface layer (3) and the middle layer (2) gradually decrease, the base layer (1) and the surface layer (3) are arranged longitudinally, and the middle layer (2) is arranged obliquely, tearing notches (4) are equidistantly provided on the base layer (1) and the surface layer (3), the tearing notches (4) on the base layer (1) and the tearing notches (4) on the surface layer (3) are misaligned, the base layer (1) and the surface layer (3) are relatively bent along the tearing notches (4) and the middle layer (2) is fixed in a wrapping manner, and the base layer (1) and the surface layer (3) are unfolded through different tearing notches (4) to expose the obliquely separable middle layer (2).

2. The composite PET plastic-steel belt according to claim 1, characterized in that: The middle layer (2) is divided into a connecting portion (21) and a mounting portion (22), the mounting portion (22) is located at the center of the connecting portion (21), and a separation mark (23) is pressed on the connecting portion (21).

3. A composite PET plastic-steel belt according to claim 2, characterized in that: The surface layer (3) is provided with convex strips (31), the convex strips (31) are equidistantly distributed on the lower surface of the surface layer (3), the base layer (1) is provided with a connecting strip (11), the connecting strip (11) corresponds to the mounting portion (22), and the center of the connecting strip (11) is provided with an embedding groove (12) of the same size as the convex strip (31).

4. The composite PET plastic-steel belt according to claim 3, characterized in that: Limiting strips (311) are symmetrically mounted on both sides of the convex strip (31), and limiting grooves (122) are provided on both side transverse surfaces of the embedding groove (12).

5. The composite PET plastic-steel belt according to claim 4, characterized in that: The cross section of the limiting strip (311) is an inverted triangle, and the cross section of the limiting groove (122) is a corresponding inverted triangle.

6. The composite PET plastic-steel belt according to claim 3, characterized in that: The area between the two tear notches (4) on the surface layer (3) is divided into a top portion (32) and an inner bending portion (33), and the area between the two tear notches (4) on the base layer (1) is divided into an outer bending portion (13) and a bottom portion (14), wherein the bending area of ​​the outer bending portion (13) is greater than the bending area of ​​the inner bending portion (33).

7. The composite PET plastic-steel belt according to claim 6, characterized in that: The inner bending portion (33) is provided with an array of glue injection holes (331), and the outer surface of the outer bending portion (13) is provided with a glue injection block (131).

8. The composite PET plastic-steel belt according to claim 7, characterized in that: The glue injection block (131) is provided with a glue injection port (132), and the glue injection port (132) is an inwardly concave spherical surface.

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