Gift box L-shaped sealing and cutting machine structure capable of improving heat shrinkage uniformity

Abstract

The utility model provides a gift box L-shaped sealing and cutting machine structure capable of improving heat shrinkage uniformity, and belongs to the technical field of sealing and cutting machines, the gift box L-shaped sealing and cutting machine structure capable of improving heat shrinkage uniformity comprises a sealing and cutting base, a pressing cover frame, an adjusting baffle assembly, a heating wire assembly and a cutter assembly, the press-fit cover frame is located over the sealing and cutting base, the sealing and cutting base and the press-fit cover frame are correspondingly arranged in the vertical direction, the short edge of one side of the press-fit cover frame is connected with the corresponding short edge of the sealing and cutting base through a hinge structure, and a rotating shaft of the hinge structure is parallel to the straight line where the short edge of the sealing and cutting base is located. The adjusting baffle assembly is installed in the sealing and cutting base, the heating wire assembly is arranged around the adjusting baffle assembly, the cutter assembly is installed at the corresponding position of the sealing and cutting base and the pressing cover frame, and the problems that heating elements in a traditional sealing and cutting machine are unreasonable in layout and uneven in stress are solved.

Description

Technical Field

[0001] This utility model belongs to the field of sealing and cutting machine technology, specifically, it relates to an L-shaped sealing and cutting machine structure for gift boxes that improves the uniformity of heat shrinkage. Background Technology

[0002] In the modern gift packaging industry, heat shrink packaging technology is widely used because it allows packaging to tightly fit the shape of the gift box, providing an aesthetically pleasing and highly protective packaging effect. The L-type sealing and cutting machine for gift boxes, as a key piece of equipment in the heat shrink packaging process, primarily functions to seal and cut gift boxes covered with heat shrink film, allowing the heat shrink film to shrink and tightly wrap the gift box during subsequent heating. Traditional L-type sealing and cutting machines for gift boxes typically include basic components such as a sealing and cutting table, a sealing and cutting mechanism, and a conveying device. The sealing and cutting mechanism generally consists of opposing sealing and cutting blades and heating elements. During the sealing and cutting process, the heating element heats and softens the heat shrink film, and then the sealing and cutting blade cuts the heat shrink film and seals it to the edge of the gift box. However, this traditional structure has many drawbacks, severely affecting the uniformity of heat shrinkage.

[0003] First, traditional sealing and cutting machines have relatively simple sealing and cutting blade structures, mostly flat and fixed designs. When faced with gift boxes of different sizes and shapes, they cannot flexibly adjust the sealing pressure and angle, resulting in uneven stress on the heat shrink film at the sealing point. For example, when the corners of the gift box are rounded or have special shapes, the flat sealing and cutting blade cannot fit completely, resulting in poor sealing at the corners, easily causing wrinkles or incomplete seals, thus affecting the uniformity of heat shrinkage. Second, the heating element layout of traditional sealing and cutting machines is not reasonable. Heating elements are often simply distributed near the sealing and cutting blade, without fully considering the heating needs of the heat shrink film throughout the sealing area. This leads to differences in the heating speed and degree of the heat shrink film at different locations; parts closer to the heating elements may be overheated, while parts farther away may be underheated. During the subsequent heat shrinking process, the unevenly heated heat shrink film will shrink to varying degrees, causing unevenness and wrinkles on the surface of the packaged gift box, seriously affecting the aesthetics and quality of the packaging.

[0004] In summary, the traditional L-shaped sealing and cutting machine structure for gift boxes has many shortcomings in terms of heat shrinkage uniformity, making it difficult to meet the demands of the modern gift packaging industry for high-quality and exquisite packaging. Therefore, developing a gift box L-shaped sealing and cutting machine structure that can effectively improve heat shrinkage uniformity is of significant practical importance. Utility Model Content

[0005] In view of this, the present invention provides an L-shaped sealing and cutting machine structure for gift boxes that improves the uniformity of heat shrinkage, avoiding the problems of unreasonable layout of heating elements and uneven force distribution in traditional sealing and cutting machines.

[0006] The present utility model is implemented as follows:

[0007] The present utility model provides a structure of an L-shaped sealing and cutting machine for gift boxes that improves the uniformity of heat shrinkage. Among them, it includes a sealing and cutting base, a pressing cover frame, an adjusting baffle component, a heating wire component, and a cutting knife component. The sealing and cutting base is specifically an L-shaped structure, and the sealing and cutting base is horizontally fixed on the equipment working plane as a basic support component. The pressing cover frame is located directly above the sealing and cutting base, and the sealing and cutting base and the pressing cover frame are correspondingly arranged in the vertical direction. One short side of the pressing cover frame is connected to the corresponding short side of the sealing and cutting base through a hinge structure. The rotation axis of the hinge structure is parallel to the straight line where the short side of the sealing and cutting base is located. The adjusting baffle component is installed inside the sealing and cutting base, the heating wire component is arranged around the adjusting baffle component, and the cutting knife component is installed at the corresponding positions of the sealing and cutting base and the pressing cover frame.

[0008] Based on the above technical solutions, the structure of an L-shaped sealing and cutting machine for gift boxes that improves the uniformity of heat shrinkage of the present utility model can be further improved as follows:

[0009] Among them, a heat sealing groove is provided inside the sealing and cutting base. The heat sealing groove is located below the upper surface of the sealing and cutting base, and the shape of the heat sealing groove is adapted to the L-shaped contour of the sealing and cutting base and is in the shape of an inverted 'convex' character.

[0010] "The shape of the heat sealing groove is adapted to the L-shaped contour of the L-shaped sealing and cutting base and is in the shape of an inverted 'convex' character" means that the overall shape of the heat sealing groove basically coincides with the L-shaped contour of the L-shaped sealing and cutting base in the plane projection. The short side part of the heat sealing groove corresponds to the short side part of the L-shaped sealing and cutting base, and the long side part also matches it. And there is a certain interval between the edge of the heat sealing groove and the edge of the L-shaped sealing and cutting base to ensure the structural strength of the sealing and cutting base.

[0011] Furthermore, the adjusting baffle component includes two baffles symmetrically arranged in the heat sealing groove inside the sealing and cutting base. The baffle has an arc-shaped surface, and the arc-shaped surfaces of the two baffles are opposite to each other. The two ends of the baffle are connected to the two side walls of the heat sealing groove through a rotating shaft, and the central axis of the rotating shaft forms an angle between 45 - 60° with the bottom surface of the heat sealing groove.

[0012] Furthermore, the heating wire component is arranged at the bottom of the heat sealing groove and around the baffle. The heating wire component is fixed through an insulating fixing piece, and the insulating fixing piece is closely connected to the bottom of the heat sealing groove and the baffle.

[0013] Furthermore, the cutting assembly includes an upper cutting blade and a lower cutting blade. The lower cutting blade is installed in a cutting groove on the top of the sealing base. The cutting groove is located above the heat sealing groove and the two are spaced apart in the vertical direction. The shape of the cutting groove is adapted to the lower cutting blade. The lower cutting blade is engaged with the cutting groove through a slot and fixed by a fastening screw. The upper cutting blade is fixed on a blade holder on the lower surface of the pressing cover frame. A shock-absorbing and buffering structure is provided between the blade holder and the pressing cover frame.

[0014] Furthermore, the inside of the pressing cover frame is covered with a heat insulation layer, which is made of heat insulation material and is attached to the inner surface of the pressing cover frame by a bonding process. The heat insulation layer is located in the space above the heat sealing groove when the pressing cover frame and the sealing base are closed.

[0015] The insulation material used in the insulation layer is ceramic fiber. By processing the ceramic fiber into a felt-like or plate-like structure and then bonding it to the inner surface of the press-fit cover frame with high-temperature resistant adhesive, it is ensured that during the high-temperature sealing and cutting process, the heat is mainly concentrated in the heat-sealing groove area, reducing the upward loss of heat and thus improving the uniformity of heat shrinkage.

[0016] Furthermore, an elastic reset component is connected between the baffle and the side wall of the heat sealing groove. One end of the elastic reset component is connected to the outer side wall of the baffle, and the other end is connected to a fixed point on the side wall of the heat sealing groove.

[0017] When the adjusting baffle is rotated away from its initial position by an external force, the elastic reset component can generate a restoring force to make the adjusting baffle return to its initial position, ensuring the relative position stability of the adjusting baffle during each sealing and cutting operation, and ensuring the consistency and uniformity of the heat shrink film sealing and cutting process.

[0018] Furthermore, the hinge structure connects the sealing and cutting base and the pressing cover frame. The two leaves of the hinge structure are fixed to the short side of the sealing and cutting base and the short side of the pressing cover frame by welding or bolting, respectively. The connection position is located near the end of the short side, and the rotation axis of the hinge structure is parallel to the upper surface of the sealing and cutting base.

[0019] Furthermore, anchor bolts are provided at the four corners of the bottom surface of the sealing and cutting base. The sealing and cutting base is connected to the working plane through the anchor bolts, and the anchor bolts are connected to the sealing and cutting base by threaded connection.

[0020] Furthermore, the insulating fastener is made of ceramic material and has a columnar structure. An annular groove is formed on the side of the insulating fastener along the axial direction, and the sealing and cutting base is embedded in the annular groove.

[0021] The height of the insulating fastener is determined by the height of the heating wire within the heat-sealing groove, generally between 3 and 8 centimeters. An annular groove is axially formed on the side of the columnar structure, into which the heating wire is embedded to ensure its stability. The bottom of the ceramic insulating fastener is adhered to the bottom of the heat-sealing groove and the corresponding position on the adjusting baffle using high-temperature resistant adhesive. The spacing between adjacent insulating fasteners is between 4 and 10 centimeters, evenly distributed, allowing the heating wire to form a stable and uniform heating layout within the heat-sealing groove and around the adjusting baffle. This effectively prevents displacement of the heating wire during operation, ensures good insulation performance, avoids safety issues such as leakage, and ensures stable heat transfer to the heat-shrinkable film, improving the uniformity of heat shrinkage.

[0022] Compared with existing technologies, the beneficial effects of the L-shaped sealing and cutting machine structure for gift boxes provided by this utility model, which improves the uniformity of heat shrinkage, are as follows:

[0023] The adjustable baffle assembly in this invention consists of two symmetrically arranged baffles within the heat-sealing groove of an L-shaped sealing base. The baffles have arc-shaped surfaces, which are opposite each other. Their radii are carefully designed to better conform to the shape of the gift box, especially at the L-shaped corners, effectively avoiding the uneven stress on the heat-shrink film caused by the inability of traditional flat-plate sealing blades to fully adhere at the corners. During the sealing operation, the adjustable baffles can rotate flexibly within a certain range according to the size of the gift box. They are connected to the side wall of the heat-sealing groove via a rotating shaft and maintain a stable position with the help of an elastic reset component (such as a tension spring). This adaptive adjustment function ensures that the heat-shrink film is evenly stressed during the sealing process, guaranteeing a tight fit between the heat-shrink film and the edge of the gift box at the sealing point, without wrinkles or gaps, greatly improving the sealing quality.

[0024] The heating wire assembly uses multiple nickel-chromium alloy heating wires, evenly distributed at the bottom of the heat-sealing groove and around the adjusting baffle. The heating wires are fixed in specific positions by ceramic insulating supports, ensuring their stability and uniformity. This arrangement allows the heat-shrink film to be heated evenly throughout the sealing area, avoiding localized overheating or underheating caused by improper heating element placement in traditional sealing machines. During the sealing process, the heat-shrink film softens uniformly, resulting in neat and smooth edges after sealing, laying a good foundation for subsequent heat shrinking processes and effectively improving the sealing quality of the heat-shrink film.

[0025] The L-shaped sealing and cutting base is securely connected to the working surface via anchor bolts. Leveling pads installed at its bottom can be adjusted according to the flatness of the working surface, ensuring the entire sealing and cutting machine remains level and stable under various working conditions. This robust installation method effectively reduces vibration and displacement during operation, providing a stable foundation for sealing and cutting operations. Simultaneously, the internal structure of the L-shaped sealing and cutting base, including the heat-sealing groove and cutting groove, is rationally designed with precisely calculated wall thicknesses. This ensures the stability of each component's installation and prevents adverse effects on heat distribution within the heat-sealing groove during cutting, maintaining the independence and synergy of the heat-sealing and cutting processes, and improving the overall stability of the equipment. Attached Figure Description

[0026] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments of this utility model will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0027] Figure 1 A front view of the structure of an L-shaped sealing and cutting machine for gift boxes designed to improve heat shrinkage uniformity;

[0028] Figure 2 Rear view of an L-shaped sealing and cutting machine structure for gift boxes designed to improve heat shrinkage uniformity;

[0029] Figure 3 A schematic diagram of the internal structure of an L-shaped sealing and cutting machine for gift boxes to improve heat shrinkage uniformity.

[0030] The attached diagram lists the components represented by each number as follows:

[0031] 10. Sealing and cutting base; 20. Pressing cover frame; 21. Hinge structure; 30. Adjusting baffle assembly; 31. Baffle; 40. Heating wire assembly; 41. Insulating fastener; 50. Cutting blade assembly; 51. Upper cutter; 52. Lower cutter. Detailed Implementation

[0032] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings.

[0033] like Figure 1 , Figure 2 , Figure 3As shown, it is the first embodiment of the structure of a gift box L-shaped sealing and cutting machine for improving the uniformity of heat shrinkage provided by the present utility model. In this embodiment, it includes a sealing and cutting base 10, a pressing cover frame 20, an adjusting baffle component 30, a heating wire component 40, and a cutting knife component 50. The sealing and cutting base 10 is specifically an L-shaped structure and is horizontally fixed on the equipment working plane as a basic support component. The pressing cover frame 20 is located directly above the sealing and cutting base 10. The sealing and cutting base 10 and the pressing cover frame 20 are correspondingly arranged in the vertical direction. One short side of the pressing cover frame 20 is connected to the corresponding short side of the sealing and cutting base 10 through a hinge structure 21. The rotation axis of the hinge structure 21 is parallel to the straight line where the short side of the sealing and cutting base 10 is located. The adjusting baffle component 30 is installed inside the sealing and cutting base 10. The heating wire component 40 is arranged around the adjusting baffle component 30. The cutting knife component 50 is installed at the corresponding positions of the sealing and cutting base 10 and the pressing cover frame 20.

[0034] The L-shaped sealing and cutting base is an overall L-shaped three-dimensional structure with a horizontal bottom surface and two mutually perpendicular side surfaces. The bottom surface is a rectangular plane. Among the two L-shaped side surfaces, one short side surface is perpendicularly connected to the other long side surface. The height of the long side surface is the same as or slightly higher than that of the short side surface.

[0035] Among them, in the above technical solution, a heat sealing groove is provided inside the sealing and cutting base 10. The heat sealing groove is located below the upper surface of the sealing and cutting base 10. The shape of the heat sealing groove is adapted to the L-shaped contour of the sealing and cutting base 10 and is in the shape of an inverted "convex" character.

[0036] Further, in the above technical solution, the adjusting baffle component 30 includes two baffles 31 symmetrically arranged in the heat sealing groove inside the sealing and cutting base 10. The baffle 31 has an arc surface. The arc surfaces of the two baffles are opposite. Both ends of the baffle 31 are connected to the two side walls of the heat sealing groove through a rotating shaft. The axis line of the rotating shaft forms an angle between 45 - 60° with the bottom surface of the heat sealing groove.

[0037] Further, in the above technical solution, the heating wire component 40 is arranged at the bottom of the heat sealing groove and around the baffle 31. The heating wire component 40 is fixed through an insulating fixing member 41. The insulating fixing member 41 is closely connected to the bottom of the heat sealing groove and the baffle 31.

[0038] A temperature control device is connected between the heating wire component and an external power supply. The temperature control device includes a temperature sensor. The temperature sensor is installed inside the heat sealing groove near the heating wire for real-time monitoring of the temperature inside the heat sealing groove. The temperature control device adjusts the power supply of the heating wire according to the temperature information fed back by the temperature sensor, thereby stably controlling the temperature inside the heat sealing groove within a suitable sealing and cutting temperature range to avoid uneven heat shrinkage effects caused by temperature fluctuations.

[0039] Furthermore, in the above technical solution, the cutting blade assembly 50 includes an upper cutting blade 51 and a lower cutting blade 52. The lower cutting blade 52 is installed in the cutting blade groove at the top of the sealing and cutting base 10. The cutting blade groove is located above the heat sealing groove and the two are spaced apart in the vertical direction. The shape of the cutting blade groove is adapted to the lower cutting blade 52. The lower cutting blade 52 is engaged with the cutting blade groove through a slot and fixed by a fastening screw. The upper cutting blade 51 is fixed on the blade holder on the lower surface of the pressing cover frame 20. A shock-absorbing and buffering structure is provided between the blade holder and the pressing cover frame 20.

[0040] The shock-absorbing and buffering structure is a combination of a rubber pad and a metal spring. The rubber pad is made of rubber material with a hardness of 40-60 Shore A and a thickness of 2-5 mm. Its area is slightly larger than the contact area between the blade holder and the lower surface of the pressing cover frame. It is glued between the blade holder and the pressing cover frame to absorb and buffer the minor vibrations generated during cutting, reducing the impact of vibration on cutting accuracy and the overall stability of the sealing and cutting machine structure. The metal spring is located below the rubber pad. One end is welded to the blade holder, and the other end contacts but is not fixed to the lower surface of the pressing cover frame. When a large impact force is generated during cutting, the metal spring can further play a shock-absorbing role, working together with the rubber pad to effectively protect the upper cutting blade and the entire sealing and cutting machine structure, making the cutting action smoother and more stable, which is conducive to the precise cutting of the heat shrink film and subsequent uniform heat shrinking.

[0041] Furthermore, in the above technical solution, the inside of the pressing cover 20 is covered with a heat insulation layer. The heat insulation layer is made of heat insulation material and is attached to the inner surface of the pressing cover 20 by a bonding process. The heat insulation layer is located in the space above the heat sealing groove when the pressing cover 20 and the sealing base 10 are closed.

[0042] Furthermore, in the above technical solution, an elastic reset component is connected between the baffle 31 and the side wall of the heat sealing groove. One end of the elastic reset component is connected to the outer side wall of the baffle 31, and the other end is connected to a fixing point on the side wall of the heat sealing groove.

[0043] The elastic reset component is a tension spring. One end of the tension spring is connected via a hook to a pre-installed connecting ring at the center of the outer wall of the adjusting baffle. The connecting ring is made of metal and welded to the outer wall of the adjusting baffle. The other end of the tension spring is connected to a fixing post on the side wall of the heat-sealing groove. The fixing post protrudes 2-4 cm from the surface of the heat-sealing groove side wall, is made of metal, and has a diameter between 1-2 cm. It is fixed to the side wall of the heat-sealing groove by threaded connection or welding. When the adjusting baffle is rotated by an external force, the tension spring is stretched, generating a restoring force. After the external force disappears, the restoring force of the tension spring allows the adjusting baffle to quickly return to its initial position, ensuring the accuracy and stability of the adjusting baffle position during each sealing and cutting operation. This ensures uniform stress on the heat shrink film during the sealing and cutting process, improving the uniformity of heat shrinkage and the sealing and cutting quality.

[0044] Furthermore, in the above technical solution, the hinge structure 21 connects the sealing and cutting base 10 and the pressing cover frame 20. The two leaves of the hinge structure 21 are fixed to the short side of the sealing and cutting base 10 and the short side of the pressing cover frame 20 by welding or bolting respectively. The connection position is located near the end of the short side, and the rotation axis of the hinge structure 21 is parallel to the upper surface of the sealing and cutting base 10.

[0045] Furthermore, in the above technical solution, anchor bolts are respectively provided at the four corners of the bottom surface of the sealing and cutting base 10. The sealing and cutting base 10 is connected to the working plane through the anchor bolts, and the anchor bolts are connected to the sealing and cutting base 10 through threaded connection.

[0046] Furthermore, in the above technical solution, the insulating fastener 41 is made of ceramic material and has a columnar structure. The side of the insulating fastener 41 has an annular groove along the axial direction, and the sealing base 10 is embedded in the annular groove.

[0047] Specifically, the principle of this utility model is as follows:

[0048] Uniform heating of the heating wire assembly:

[0049] The heating wire assembly serves as the heat source during the heat sealing process, employing nickel-chromium alloy heating wires due to the high resistivity and excellent high-temperature resistance of nickel-chromium alloys. Multiple heating wires are fixed to the bottom of the heat-sealing groove and around the adjusting baffle via ceramic insulating supports, forming a three-dimensional heating network. According to the basic principles of heat conduction, heat is transferred from the high-temperature heating wires to the surrounding low-temperature areas. In this structure, the uniform distribution of the heating wires ensures a relatively uniform heat flux density throughout the heat-sealing groove. For example, the heating wires at the bottom of the heat-sealing groove primarily transfer heat to the bottom of the heat-shrinkable film, while the heating wires distributed around the adjusting baffle ensure uniform heating of the sides of the heat-shrinkable film as well. This omnidirectional, uniform heating method allows the heat-shrinkable film to soften uniformly before sealing and cutting, providing a good thermal basis for the subsequent sealing, cutting, and heat-shrinking processes.

[0050] Synergistic thermal effect of heat sealing groove and regulating baffle:

[0051] The shape of the heat-sealing groove is designed as an inverted "convex" shape and is adapted to the L-shaped contour of the L-shaped sealing and cutting base. This shape is conducive to the accumulation and uniform distribution of heat in the groove. The adjusting baffle is made of a copper alloy with good thermal conductivity. When the heating wire works, heat is not only transferred to the heat-shrinkable film through the wall surface of the heat-sealing groove, but also through the adjusting baffle. Since the adjusting baffle is in an arc structure and is in close contact with the heat-shrinkable film, heat can be evenly conducted to the heat-shrinkable film along the arc surface. Especially at the L-shaped corner of the gift box, the arc of the adjusting baffle can better fit the heat-shrinkable film, enabling heat to be evenly transferred at the corner and avoiding the problems of insufficient or uneven heat at the corner in the traditional structure. At the same time, the connection structure (rotating shaft) between the adjusting baffle and the side wall of the heat-sealing groove and the elastic reset component (tensile spring) also affect the heat transfer to a certain extent. The position and angle of the rotating shaft are designed so that the adjusting baffle can maintain a good heat conduction path at different positions, and the tensile spring can maintain its relative position relationship with other components in the heat-sealing groove when the adjusting baffle is forced to rotate, ensuring the stability of heat transfer.

Claims

1. A gift box L-shaped sealing and cutting machine structure for improving heat shrinkage uniformity, characterized in that, The device comprises a sealing and cutting base (10), a pressing cover frame (20), an adjusting baffle assembly (30), a heating wire assembly (40), and a cutting blade assembly (50). The sealing and cutting base (10) is specifically L-shaped and is horizontally fixed to the working plane of the equipment, serving as a basic support component. The pressing cover frame (20) is located directly above the sealing and cutting base (10). The sealing and cutting base (10) and the pressing cover frame (20) are vertically aligned. One short side of the sealing and cutting base (10) is connected to the corresponding short side of the sealing and cutting base (10) through a hinge structure (21). The rotation axis of the hinge structure (21) is parallel to the straight line of the short side of the sealing and cutting base (10). The adjusting baffle assembly (30) is installed inside the sealing and cutting base (10). The heating wire assembly (40) is arranged around the adjusting baffle assembly (30). The cutter assembly (50) is installed at the corresponding positions of the sealing and cutting base (10) and the pressing cover frame (20).

2. The L-shaped sealing and cutting machine structure for gift boxes to improve heat shrinkage uniformity according to claim 1, characterized in that, The sealing and cutting base (10) has a heat sealing groove inside. The heat sealing groove is located below the upper surface of the sealing and cutting base (10). The shape of the heat sealing groove is adapted to the L-shaped outline of the sealing and cutting base (10) and is an inverted "convex" shape.

3. The L-shaped sealing and cutting machine structure for gift boxes to improve heat shrinkage uniformity according to claim 2, characterized in that, The adjusting baffle assembly (30) includes two baffles (31) symmetrically arranged in the heat sealing groove inside the sealing base (10). The baffles (31) have arc-shaped surfaces, and the arc-shaped surfaces of the two baffles (31) are opposite to each other. The two ends of the baffles (31) are connected to the two side walls of the heat sealing groove through a rotating shaft. The angle between the axis of the rotating shaft and the bottom surface of the heat sealing groove is between 45° and 60°.

4. The L-shaped sealing and cutting machine structure for gift boxes to improve heat shrinkage uniformity according to claim 3, characterized in that, The heating wire assembly (40) is arranged at the bottom of the heat sealing groove and around the baffle (31). The heating wire assembly (40) is fixed by an insulating fastener (41), which is tightly connected to the bottom of the heat sealing groove and the baffle (31).

5. The L-shaped sealing and cutting machine structure for gift boxes to improve heat shrinkage uniformity according to claim 4, characterized in that, The cutting blade assembly (50) includes an upper cutting blade (51) and a lower cutting blade (52). The lower cutting blade (52) is installed in the cutting blade groove at the top of the sealing and cutting base (10). The cutting blade groove is located above the heat sealing groove and the two are spaced apart in the vertical direction. The shape of the cutting blade groove is adapted to the lower cutting blade (52). The lower cutting blade (52) is engaged with the cutting blade groove through a slot and fixed by a fastening screw. The upper cutting blade (51) is fixed on the blade holder on the lower surface of the pressing cover frame (20). A shock-absorbing and buffering structure is provided between the blade holder and the pressing cover frame (20).

6. The L-shaped sealing and cutting machine structure for gift boxes to improve heat shrinkage uniformity according to claim 5, characterized in that, The inside of the pressing cover frame (20) is covered with a heat insulation layer. The heat insulation layer is made of heat insulation material and is attached to the inner surface of the pressing cover frame (20) by a bonding process. The heat insulation layer is located in the space above the heat sealing groove when the pressing cover frame (20) and the sealing base (10) are closed.

7. The L-shaped sealing and cutting machine structure for gift boxes to improve heat shrinkage uniformity according to claim 6, characterized in that, An elastic reset component is connected between the baffle (31) and the side wall of the heat sealing groove. One end of the elastic reset component is connected to the outer side wall of the baffle (31), and the other end is connected to a fixed point on the side wall of the heat sealing groove.

8. The L-shaped sealing and cutting machine structure for gift boxes to improve heat shrinkage uniformity according to claim 7, characterized in that, The hinge structure (21) connects the sealing and cutting base (10) and the pressing cover frame (20). The two leaves of the hinge structure (21) are fixed to the short side of the sealing and cutting base (10) and the short side of the pressing cover frame (20) by welding or bolting respectively. The connection position is located near the end of the short side, and the rotation axis of the hinge structure (21) is parallel to the upper surface of the sealing and cutting base (10).

9. The L-shaped sealing and cutting machine structure for gift boxes to improve heat shrinkage uniformity according to claim 8, characterized in that, Anchor bolts are provided at the four corners of the bottom surface of the sealing and cutting base (10). The sealing and cutting base (10) is connected to the working plane through the anchor bolts. The anchor bolts are connected to the sealing and cutting base (10) by threaded connection.

10. The L-shaped sealing and cutting machine structure for gift boxes to improve heat shrinkage uniformity according to claim 9, characterized in that, The insulating fastener (41) is made of ceramic material and has a columnar structure. The side of the insulating fastener (41) has an annular groove along the axial direction, and the sealing base (10) is embedded in the annular groove.

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