A heating device and preparation method for preparing ultra-flat plastic woven tubular fabric

Abstract

This application relates to the field of woven plastic tubular fabric production technology, specifically disclosing a heating device and method for preparing ultra-flat woven plastic tubular fabric. The device includes a heating roller mechanism, which is positioned between the loom body of a circular loom and the tubular fabric winding mechanism. The heating roller mechanism includes a heated roller body capable of generating heat and rotating. This application improves the flatness of the woven plastic tubular fabric, achieving an ultra-flat planar appearance.

Description

Technical Field

[0001] This application relates to the field of plastic woven tubular fabric production technology, and in particular to a method for preparing heat-set ultra-flat plastic woven tubular fabric. Background Technology

[0002] Woven plastic tubular fabric is a packaging material made by weaving warp and weft yarns of a certain specification on a circular loom with a specific reed density. It has a wide range of applications, especially in the materials packaging industry where it holds a dominant position. With the increasing demand for packaging high-end materials, such as food-grade materials, the quality requirements for woven plastic tubular fabric are becoming increasingly stringent, particularly regarding the surface smoothness.

[0003] In related technologies, the plastic woven circular loom includes a loom body and a package winding mechanism. The woven plastic packaged fabric is output from the loom body and wound up by the package winding mechanism. The plastic woven circular loom uses a free unwinding warp feeder and a shuttle unwinding weft feeder to provide warp and weft yarns to the loom. Regardless of whether the weft yarn is fed by the feeder or the shuttle, it needs to be pulled by the circular loom to rotate the yarn tubes on the yarn tube frame and release the yarns from the yarn tubes.

[0004] As the filaments are released, the winding diameter on the bobbin changes accordingly, resulting in significant differences in the weight of the filaments stored on the bobbin. The gravitational resistance force on each filament also changes continuously as the filaments are released. The circular loom applies the same traction force to the filaments. Under the influence of this traction force and the constantly changing gravitational resistance force, the filaments experience a dynamically varying tensile force and elongate. Due to the changing gravitational resistance force and the inherent plastic resilience of the plastic filaments, highly varying internal stresses are generated in each filament. This internal stress is positively correlated with the weight of the filaments on the bobbin. Newly placed filaments on the bobbin have the greatest gravitational resistance force, resulting in the greatest filament elongation and the highest probability of shrinkage, as well as the highest internal stress. Conversely, filaments that are about to be wound have the least gravitational resistance force, the lowest probability of shrinkage, and the lowest internal stress.

[0005] The variation in internal stress of individual filaments due to changes in the winding diameter of the tubing results in a discrete and free distribution. This differential variation ultimately leads to significant differences in internal stress between individual warp and weft filaments, and even among individual weft filaments, after the warp and weft yarns are woven into a woven plastic tubular fabric. Consequently, the amount of shrinkage per filament varies considerably. This difference in shrinkage causes unevenness in the woven plastic tubular fabric, and in severe cases, results in the fabric being misaligned from left to right. Summary of the Invention

[0006] To improve the flatness of woven plastic tubular fabric, this application provides a method for preparing heat-set ultra-flat woven plastic tubular fabric.

[0007] Firstly, the heating device for preparing ultra-flat plastic woven tubular fabric provided in this application adopts the following technical solution:

[0008] A heating device for preparing ultra-flat plastic woven tubular fabric includes a heating roller mechanism, which is disposed between the loom body of a circular loom and the tubular fabric winding mechanism. The heating roller mechanism includes a heated roller body capable of generating heat and rotating.

[0009] By adopting the above technical solution, before the woven fabric produced by the loom is wound onto the heated roller body by the winding mechanism, the warp and weft yarns of the woven fabric undergo a momentary thermal shrinkage under the action of the heated roller. This slight shrinkage effectively eliminates the internal stress of the warp and weft yarns caused by defects in the weaving process, bringing the internal stress of each individual warp and weft yarn close to zero. By eliminating the internal stress of each individual warp and weft yarn, the "compression" and "being compressed" internal stress effects between warp and weft yarns disappear, thereby improving the flatness of the woven fabric and achieving an "ultra-flat" planar appearance.

[0010] The woven plastic tubular fabric is heated through direct contact with the heated roller. Compared to methods such as hot air blowing or heat radiation, this method effectively ensures heating efficiency and minimizes the possibility of unresolved internal stress in some monofilaments. Furthermore, the instantaneous heating during contact prevents the warp and weft yarns of the woven plastic tubular fabric from melting due to continuous heating.

[0011] Optionally, it also includes a front guide roller and a rear guide roller, both of which are rotatable, and the front guide roller, the hot roller body, and the rear guide roller are arranged sequentially along the transmission direction of the woven plastic tubular fabric.

[0012] By employing the above technical solution, the woven plastic tubing is sequentially wound onto the front guide roller, the heated roller, and the rear guide roller. This arrangement facilitates the transport of the woven plastic tubing. By setting the rotation directions of the front guide roller, the heated roller, and the rear guide roller to be consistent, and ensuring that the linear velocity of the front guide roller surface is not less than the linear velocity of the heated roller surface, and the linear velocity of the rear guide roller surface is not greater than the linear velocity of the heated roller surface, additional tension on the already stress-relieved woven plastic tubing is minimized. This arrangement effectively ensures the flatness of the woven plastic tubing.

[0013] Optionally, it also includes a box-type opening and closing mechanism, which includes a lower box body and an upper box cover. The lower box body and the upper box cover form a heat preservation cavity, a fabric inlet and a fabric outlet. The hot roller body is located inside the heat preservation cavity, and the fabric inlet and the fabric outlet are both connected to the heat preservation cavity.

[0014] By adopting the above technical solution, before winding the woven plastic tubing onto the heated roller, the upper cover and lower box are first separated. Then, the woven plastic tubing is wound onto the heated roller, passing through the insulation cavity of the lower box. The upper cover and lower box are then closed. This process ensures that the woven plastic tubing enters the insulation cavity through the inlet and exits through the outlet. This not only guarantees the normal transmission of the woven plastic tubing but also, through the box-type opening and closing mechanism, minimizes the rapid loss of heat generated by the heated roller, helping to eliminate internal stress on the woven plastic tubing.

[0015] Optionally, the box-type opening and closing mechanism further includes a support roller and a linkage assembly. The linkage assembly includes a movable seat, a linkage block, a mating block, and a pressing block. The pressing block is disposed on the upper box cover. The mating block and the movable seat are both slidably disposed in the lower box in the vertical direction. The pressing block is used to abut against the mating block. The linkage block is slidably disposed in the lower box in the horizontal direction. The linkage block has a first linkage inclined surface and a second linkage inclined surface. The first linkage inclined surface faces the mating block and abuts against the mating block. The second linkage inclined surface faces the movable seat and abuts against the movable seat. The support roller is rotatably disposed on the movable seat and is used to abut against the woven plastic tubular fabric. A reset elastic element is connected to the movable seat. The reset elastic element is used to drive the movable seat to reset downward.

[0016] When the upper box cover and the lower box body are closed, the pressing block presses against the mating block, the linkage block, the mating block, and the moving seat all abut against each other, and there is a heating channel between the cloth support roller and the hot roller body for the plastic woven tubular cloth to pass through.

[0017] When the upper cover is separated from the lower box body, the gap between the cloth roller and the heating roller is greater than that between the heating channels.

[0018] By adopting the above technical solution, under the action of the support roller, even if the linear speed of the front guide roller is set to be no less than the linear speed of the hot roller body and the linear speed of the hot roller body is set to be no less than the linear speed of the rear guide roller, the plastic woven tubular fabric will not be unable to contact the hot roller body due to loosening of the plastic woven tubular fabric, effectively ensuring that each section of plastic woven tubular fabric can eliminate internal stress through the hot roller body.

[0019] When winding the woven plastic tubular fabric onto the heated roller, with the upper cover and lower box body separated, pass one end of the woven plastic tubular fabric between the heated roller body and the support roller. Then, close the upper cover and lower box body, press the pressing block down onto the mating block, and the mating block presses down on the first linkage inclined surface and drives the linkage block to move. The linkage block drives the moving seat to move upward through the second linkage inclined surface, thereby driving the support roller to move upward to reduce the gap between the support roller and the heated roller body and form a heating channel for the woven plastic tubular fabric to pass through.

[0020] With this setup, even with the addition of a support roller, the gap between the support roller and the heated roller body will be increased relative to the width of the heating channel when the upper cover is separated from the lower box body via the linkage component. This not only effectively ensures the ease with which the woven plastic tubular fabric is wound onto the heated roller body, but also eliminates the need for additional adjustment of the support roller.

[0021] Optionally, the box-type opening and closing mechanism further includes a leveling component disposed on the side of the fabric roller near the inlet. The leveling component includes an upper clamping plate disposed on the upper box cover and a lower clamping plate disposed on the movable seat. When the upper box cover and the lower box body are closed, there is a leveling channel between the upper clamping plate and the lower clamping plate for the plastic woven tubular fabric to pass through.

[0022] By adopting the above technical solution, when transferring the woven plastic tubing, the tubing first enters the insulation chamber through the inlet, then enters the leveling channel. The upper and lower clamps effectively limit the stacking and wrinkling of the woven plastic tubing. Finally, it enters the heating channel to eliminate internal stress. The leveling assembly not only effectively ensures the flatness of the woven plastic tubing entering the heating channel, allowing it to be heated in a flat state, thus guaranteeing its flatness after stress elimination, but also minimizes contact between the woven plastic tubing that has not yet entered the heating channel and the heated roller due to stacking and wrinkles. Furthermore, by placing the upper clamp on the upper cover and the lower clamp on the moving seat, a larger operating space is provided during the initial operation of winding the woven plastic tubing around the heated roller, facilitating operator work.

[0023] Secondly, the preparation method provided in this application adopts the following technical solution:

[0024] A preparation method, comprising the following steps:

[0025] Winding the heated roller: Wrap the woven plastic tubular fabric around the heated roller and start the heated roller to heat up;

[0026] Winding: The end of the tubular fabric heated by the hot roller is connected to the tubular fabric winding mechanism, and the woven tubular fabric is wound up by the tubular fabric winding mechanism.

[0027] By adopting the above technical solution, before the plastic woven tubular fabric is wound up, it is first heated instantaneously by a hot roller at a suitable temperature. This eliminates the internal stress of the monofilaments, resulting in extremely high flatness of the plastic woven tubular fabric, achieving an "ultra-flat" appearance.

[0028] Optionally, the process may include a front guide roller winding step before the heating roller winding step, and a rear guide roller winding step between the heating roller winding step and the winding step.

[0029] Winding the front guide roller: The plastic woven tubular fabric produced by the loom body is wound onto the front guide roller;

[0030] Back guide roller: The woven plastic tubular fabric heated by the hot roller body is wound onto the back guide roller.

[0031] By adopting the above technical solution, the plastic woven tubular fabric is sequentially wound onto the front guide roller, the heated roller body, and the rear guide roller. The front guide roller pulls the plastic woven tubular fabric produced by the loom body, and the rear guide roller pulls the plastic woven tubular fabric that has been heated to eliminate the internal stress of the monofilaments, which helps to transport the plastic woven tubular fabric.

[0032] Optionally, the linear velocity of the surface of the front guide roller is not less than the linear velocity of the surface of the hot roller body, and the linear velocity of the surface of the rear guide roller is not greater than the linear velocity of the surface of the hot roller body.

[0033] By adopting the above technical solution, it is possible to avoid the situation where the plastic woven tubular fabric, after being heated to eliminate the internal stress of the monofilaments, is stretched again due to unreasonable linear speed configuration, thus effectively ensuring the flatness of the plastic woven tubular fabric.

[0034] Optionally, the temperature of the hot roller body is not less than 40 degrees Celsius and the temperature of the hot roller body is not greater than 80 degrees Celsius.

[0035] By adopting the above technical solution, the temperature in the workshop in each season, the specifications of the warp and weft yarns, and the reed density of the woven plastic tubular fabric can be adjusted within this range. This ensures that the internal stress of the yarns is eliminated while minimizing the melting of the warp and weft yarns, thus guaranteeing the quality of the finished woven plastic tubular fabric.

[0036] Optionally, it also includes a warp replacement step, which adopts a pagoda-style segmented warp replacement operation method.

[0037] By adopting the above technical solution, workers use a pagoda-style segmented yarn replacement method to change the warp yarns, causing the internal stress of each filament to increase or decrease systematically. This relatively reduces the stress-induced unevenness of the filaments, thus initially reducing the absolute unevenness of the woven plastic tubular fabric. Further processing with a heated roller mechanism ensures the finished woven plastic tubular fabric meets the technical requirement of ultra-flatness.

[0038] In summary, this application includes at least one of the following beneficial technical effects:

[0039] 1. The heating roller mechanism heats the woven plastic tubular fabric, causing the warp and weft yarns of the woven plastic tubular fabric to undergo instantaneous heat-melting micro-shrinkage. This reduces the internal stress in the warp and weft yarns caused by defects in the weaving process, thereby improving the flatness of the woven plastic tubular fabric and achieving an "ultra-flat" planar appearance effect.

[0040] 2. By adjusting the linear speeds of the front guide roller, the heated roller, and the rear guide roller, additional tension on the already stress-relieved woven fabric is minimized. This setup effectively ensures the flatness of the woven fabric.

[0041] 3. Under the action of the support roller, the situation where the woven plastic tubular fabric cannot make contact with the hot roller body due to loosening of the woven plastic tubular fabric is avoided as much as possible, which effectively ensures that the internal stress of each section of woven plastic tubular fabric can be eliminated by the hot roller body. Attached Figure Description

[0042] Figure 1 This is a schematic diagram of the structure of Embodiment 1 of this application.

[0043] Figure 2 This is a cross-sectional view of the box-type opening and closing mechanism in Embodiment 1 of this application.

[0044] Figure 3 This is an exploded schematic diagram of the box-type opening and closing mechanism of Embodiment 2 of this application.

[0045] Figure 4 This is a cross-sectional view of the box-type opening and closing mechanism of Embodiment 2 of this application.

[0046] Figure 5 This is a cross-sectional view highlighting the linkage component in Embodiment 2 of this application.

[0047] Explanation of reference numerals in the attached figures:

[0048] 1. Base; 2. Front guide roller; 21. Front motor; 3. Heated roller mechanism; 31. Heated roller body; 32. Heated roller motor; 4. Rear guide roller; 41. Rear motor; 5. Output roller; 6. Box-type opening and closing mechanism; 61. Upper box cover; 611. Buckle; 62. Lower box body; 621. Locking block; 622. Moving groove; 623. Leaving groove; 624. Linkage groove; 625. Matching groove; 63. Insulation cavity; 6 4. Fabric inlet; 65. Fabric outlet; 66. Fabric support roller; 661. Heating channel; 67. Linkage assembly; 671. Moving seat; 672. Linkage block; 673. Matching block; 674. Pressing block; 675. Reset elastic element; 676. First linkage inclined surface; 677. Second linkage inclined surface; 68. Leveling assembly; 681. Upper clamping plate; 682. Lower clamping plate; 683. Connecting block; 684. Leveling channel. Detailed Implementation

[0049] The following is in conjunction with the appendix Figure 1-5 This application will be described in further detail.

[0050] This application discloses a heating device for preparing ultra-flat plastic woven tubular fabric.

[0051] Example 1:

[0052] Reference Figure 1The heating device for preparing ultra-flat plastic woven tubular fabric is installed between the main body of the circular loom and the tubular fabric winding mechanism. The heating device for preparing ultra-flat plastic woven tubular fabric includes a base 1, a front guide roller 2, a heating roller mechanism 3, a rear guide roller 4, and an output roller 5. The rotation directions of the front guide roller 2, the heating roller mechanism 3, the rear guide roller 4, and the output roller 5 are all the same, and they are arranged sequentially on the base 1 in the direction of conveying the plastic woven tubular fabric.

[0053] Reference Figure 1 The front guide roller 2, the rear guide roller 4, and the output roller 5 are all rotatably mounted on the base 1. The base 1 is fixed with the front motor 21 and the rear motor 41. The output shaft of the front motor 21 is fixedly connected to the front guide roller 2 to drive the front guide roller 2 to rotate. The output shaft of the rear motor 41 is fixedly connected to the rear guide roller 4 to drive the rear guide roller 4 to rotate.

[0054] Reference Figure 1 The base 1 is also equipped with a box-type opening and closing mechanism 6, which includes an upper box cover 61 and a lower box body 62. The upper box cover 61 is provided with multiple buckles 611, one end of which is rotatably mounted on the upper box cover 61. The lower box body 62 is fixed with locking blocks 621 corresponding to the number of buckles 611. The buckles 611 are used to engage with the corresponding locking blocks 621 to achieve relative fixation between the upper box cover 61 and the lower box body 62. The upper box cover 61 and the lower box body 62 can be separated by a hydraulic cylinder, a pneumatic cylinder, an electric push rod, or manually.

[0055] Reference Figure 2 The upper cover 61 and the lower cover form an insulation cavity 63, a fabric inlet 64 and a fabric outlet 65. The fabric inlet 64 and the fabric outlet 65 are located on both sides of the insulation cavity 63. Both the fabric inlet 64 and the fabric outlet 65 are connected to the insulation cavity 63 so that the insulation cavity 63 can be connected to the upper cover 61 and the lower box body 62.

[0056] Reference Figure 1 , Figure 2 The hot roller mechanism includes a hot roller body 31 and a hot roller motor 32. The hot roller motor 32 is fixed on the lower housing 62, and the output shaft of the hot roller motor 32 is fixedly connected to the hot roller body 31. The hot roller body 31 is cylindrical and hollow. The hot roller body 31 is lower than the front guide roller 2 and the rear guide roller 4. The hot roller body 31 is located inside the heat preservation cavity 63, and the hot roller body 31 is rotatably mounted on the lower housing 62.

[0057] Reference Figure 2 The heated roller 31 generates heat when energized, and its temperature can be adjusted by adding a potentiometer or other means. By installing a temperature sensing element, such as a thermocouple, on the heated roller 31, the temperature on the heated roller 31 can be acquired in real time and converted into an electrical signal output, so as to form a readable value and temperature range value on the external dial.

[0058] The implementation principle of Example 1 is as follows: After the plastic woven tubular fabric is output from the circular loom, it first winds around the upper side of the front guide roller 2, then around the lower side of the heated roller 31, then around the upper side of the rear guide roller 4, and then around the upper side of the output roller 5, and finally is wound up by the tubular fabric winding mechanism. The heated roller 31 can eliminate the internal stress of each warp and weft filament on the plastic woven tubular fabric, improve the flatness of the plastic woven tubular fabric, and achieve an "ultra-flat" planar appearance effect.

[0059] Example 2:

[0060] Reference Figure 3 , Figure 4 The difference between this embodiment and embodiment 1 is that the box-type opening and closing mechanism 6 also includes a cloth support roller 66, two sets of linkage components 67 for driving the cloth support roller 66 to rise and fall, and a leveling component 68 disposed on the side of the cloth support roller 66 near the cloth inlet 64.

[0061] Reference Figure 4 , Figure 5 The linkage assembly 67 includes a movable base 671, two linkage blocks 672, two mating blocks 673, and two pressing blocks 674 fixed on the upper cover 61. The lower housing 62 has a number of movable slots 622 equal to the number of movable bases 671. The walls of the movable slots 622 have clearance slots 623 that communicate with the insulation cavity 63. Both the clearance slots 623 and the movable slots 622 extend vertically. The movable base 671 is slidably disposed in different movable slots 622 along the vertical direction. A reset elastic element 675, which is a spring, is disposed on the movable base 671. The two ends of the reset elastic element 675 are fixed to the movable base 671 and the lower housing 62, respectively. The reset elastic element 675 applies a downward force to the movable base 671 to drive it to reset downwards. A cloth-supporting roller 66 is rotatably disposed on the movable base 671 of the two linkage assemblies 67, and its end is slidably disposed in the clearance slot 623.

[0062] Reference Figure 5Each of the two opposite walls of the moving groove 622 has a horizontally extending linkage groove 624, and two linkage blocks 672 are slidably disposed in different linkage grooves 624. A mating groove 625 is formed on the wall of the linkage groove 624 away from the moving groove 622, extending vertically upward through the lower housing 62. A mating block 673 is slidably disposed in the mating groove 625. The mating groove 625 also allows the pressing block 674 to extend into it, and the mating block 673 abuts against the pressing block 674. A first linkage inclined surface 676 is formed on the end of the linkage block 672 away from the moving groove 622, facing the mating block 673 and abutting against it. A second linkage inclined surface 677 is formed on the end of the linkage block 672 away from the mating groove 625, facing the moving seat 671 and abutting against it.

[0063] Reference Figure 4 , Figure 5 When the upper cover 61 and the lower cover 62 are closed, the pressing block 674 presses against the adjacent mating block 673. The mating block 673 moves down and presses against the first linkage inclined surface 676. The linkage block 672 presses against the moving seat 671 through the second linkage inclined surface 677. The moving seat 671 moves up and drives the cloth support roller 66 to move up. There is a heating channel 661 between the cloth support roller 66 and the hot roller body 31 for the plastic woven tubular cloth to pass through. At this time, the reset elastic element 675 is stretched.

[0064] Reference Figure 4 , Figure 5 When the upper cover 61 separates from the lower body 62, the pressing block 674 moves out of the mating groove 625. Under the action of the reset elastic element 675, the support roller 66, and the gravity of the moving seat 671, the moving seat 671 moves downward to reset, the support roller 66 moves downward and widens the gap between the support roller 66 and the heating roller, and the gap between the support roller 66 and the heating roller is greater than the width of the heating channel 661. The moving seat 671 presses against the second linkage inclined surface 677 of the linkage block 672, causing two adjacent linkage blocks 672 to move in opposite directions, and the mating block 673 moves upward through the first linkage inclined surface 676.

[0065] Reference Figure 4 The leveling assembly 68 includes an upper clamping plate 681, a lower clamping plate 682, and two connecting blocks 683. The upper clamping plate 681 is fixed to the upper cover 61, and the lower clamping plate 682 is fixed to the two connecting blocks 683. One end of each connecting block 683 extends into an adjacent clearance groove 623 and is fixedly connected to an adjacent movable seat 671. When the upper cover 61 and the lower box body 62 are closed, a leveling channel 684 for the woven plastic tubular fabric to pass through exists between the upper clamping plate 681 and the lower clamping plate 682.

[0066] The implementation principle of Example 2 is as follows: When the woven plastic tubing is wound onto the heating roller, the upper cover 61 and the lower box 62 are first separated. At this time, the moving seat 671 moves down, and the support roller 66 and the lower clamping plate 682 move down together, widening the distance between the support roller 66 and the heating roller 31, increasing the operating space for the operator, and making it easier for the operator to pass the woven plastic tubing through the support roller 66 and the heating roller 31. Then, the upper cover 61 and the lower box 62 are closed, and the linkage component 67 is activated, causing the support roller 66 and the lower clamping plate 682 to rise, narrowing the distance between the support roller 66 and the heating roller 31 and generating a leveling channel 684 and a heating channel 661. Even if the woven plastic tubing becomes loose due to the linear speed setting, the leveling channel 684 can still keep the woven plastic tubing flat when it enters the heating channel 661. The heating channel 661 ensures that each section of woven plastic tubing can contact the heating roller 31 and have its internal stress eliminated by the heating roller 31.

[0067] This application also discloses a preparation method.

[0068] Example 3:

[0069] A preparation method, comprising the following steps:

[0070] Winding the front guide roller: The plastic woven tubular fabric produced by the loom body is wound onto the front guide roller;

[0071] Winding the heated roller: Wrap the woven plastic tubular fabric around the heated roller and start the heated roller to heat it. The temperature of the heated roller should not be less than 40 degrees Celsius and should not exceed 80 degrees Celsius. The temperature of the heated roller is mainly available in five levels: 40℃, 50℃, 60℃, 70℃, and 80℃. Select one of the temperature levels according to the temperature in the workshop in different seasons, the reed density of the woven plastic tubular fabric, and the specifications of the warp and weft yarns.

[0072] Closing the box-type opening and closing mechanism: Close the upper box cover and the lower box body, and lock the upper box cover and the lower box body with buckles and blocks;

[0073] Back guide roller: The woven plastic tubular fabric heated by the hot roller body is wound onto the back guide roller. The linear velocity of the front guide roller surface is not less than the linear velocity of the hot roller body surface, and the linear velocity of the back guide roller surface is not greater than the linear velocity of the hot roller body surface.

[0074] Winding: The end of the tubular fabric heated by the hot roller is connected to the tubular fabric winding mechanism, and the woven tubular fabric is wound up by the tubular fabric winding mechanism;

[0075] Warp replacement: The warp replacement procedure adopts the pagoda-style segmented warp replacement operation method;

[0076] Weft yarn replacement: The weft yarn replacement process adopts the "full-half, full-half" tube replacement method, that is, the difference in yarn length between two adjacent weft yarn tubes is half a tube. For example, one tube of two adjacent weft yarn tubes is a newly replaced full tube, and the other tube of two adjacent weft yarn tubes is the remaining half tube. This setting can make the internal stress of the single filaments between the weft yarns form a regular distribution, which also helps to improve the flatness of the fabric surface between the weft yarns.

[0077] The implementation principle of Example 3 is as follows: Warp yarns are replaced using a pagoda-style segmented yarn replacement method, and weft yarns are replaced using a "full-half, full-half" tube yarn replacement method, initially reducing the absolute unevenness of the woven plastic tubing. Then, the woven plastic tubing is instantaneously heated by a heated roller, eliminating internal stresses on the warp and weft yarns, between warp and weft yarns, and between weft yarns, thus achieving the technical requirement of ultra-flatness. By setting the linear speeds of the front guide roller, the heated roller, and the rear guide roller, external stretching of the woven plastic tubing is minimized.

[0078] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A heating device for preparing ultra-flat plastic woven tubular fabric, characterized in that: It includes a heating roller mechanism (3), which is used to be set between the loom body of the circular loom and the coil winding mechanism. The heating roller mechanism (3) includes a heating roller body (31) that can generate heat and rotate. It also includes a box-type opening and closing mechanism (6), which includes a lower box body (62) and an upper box cover (61). The lower box body (62) and the upper box cover (61) form a heat preservation cavity (63), a fabric inlet (64) and a fabric outlet (65). The hot roller body (31) is located inside the heat preservation cavity (63). The fabric inlet (64) and the fabric outlet (65) are both connected to the heat preservation cavity (63). The box-type opening and closing mechanism (6) further includes a support roller (66) and a linkage assembly (67). The linkage assembly (67) includes a movable seat (671), a linkage block (672), a mating block (673), and a pressing block (674). The pressing block (674) is disposed on the upper box cover (61). The mating block (673) and the movable seat (671) are both slidably disposed vertically within the lower box body (62). The pressing block (674) is used to abut against the mating block (673). The linkage block (672) is slidably disposed horizontally within the lower box body (62). The linkage block (672) is provided with a first linkage inclined surface (676) and a second linkage inclined surface (677). The first linkage inclined surface (676) faces the mating block (673) and abuts against the mating block (673). The second linkage inclined surface (677) faces the moving seat (671) and abuts against the moving seat (671). The cloth roller (66) is rotatably mounted on the moving seat (671) and is used to abut against the plastic woven tubular cloth. The moving seat (671) is connected to a reset elastic element (675). The reset elastic element (675) is used to drive the moving seat (671) to reset downward. When the upper box cover (61) and the lower box body (62) are closed, the pressing block (674) presses against the mating block (673), the linkage block (672) abuts against the mating block (673) and the moving seat (671), and there is a heating channel (661) between the cloth roller (66) and the hot roller body (31) for the plastic woven tubular cloth to pass through; When the upper cover (61) is separated from the lower box body (62), the gap between the cloth roller (66) and the heating roller is greater than that between the heating channel (661).

2. The heating device for preparing ultra-flat woven tubular fabric according to claim 1, characterized in that: It also includes a front guide roller (2) and a rear guide roller (4), both of which are rotatable. The front guide roller (2), the hot roller body (31), and the rear guide roller (4) are arranged in sequence along the transmission direction of the plastic woven tubular fabric.

3. The heating device for preparing ultra-flat woven tubular fabric according to claim 1, characterized in that: The box-type opening and closing mechanism (6) also includes a leveling component (68) disposed on the side of the fabric roller (66) near the inlet (64). The leveling component (68) includes an upper clamping plate (681) disposed on the upper box cover (61) and a lower clamping plate (682) disposed on the movable seat (671). When the upper box cover (61) and the lower box body (62) are closed, there is a leveling channel (684) between the upper clamping plate (681) and the lower clamping plate (682) for the plastic woven tubular fabric to pass through.

4. A preparation method, characterized in that, The heating device for preparing ultra-flat woven tubular fabric as described in claim 1 includes the following steps: Wrap the heated roller body (31): Wrap the woven plastic tubular fabric around the heated roller body (31) and start the heated roller body (31) to heat it; Winding: The end of the tubular fabric heated by the hot roller (31) is connected to the tubular fabric winding mechanism, and the woven tubular fabric is wound up by the tubular fabric winding mechanism.

5. The preparation method according to claim 4, characterized in that: The step of winding the heated roller body (31) is preceded by the step of winding the front guide roller (2), and the step of winding the rear guide roller (4) is further included between the step of winding the heated roller body (31) and the winding step. Wrap the plastic woven tubular fabric produced by the loom body around the front guide roller (2); Wrap the rear guide roller (4): Wrap the plastic woven tubular fabric heated by the hot roller body (31) onto the rear guide roller (4).

6. The preparation method according to claim 5, characterized in that: The linear velocity of the surface of the front guide roller (2) is not less than the linear velocity of the surface of the hot roller body (31), and the linear velocity of the surface of the rear guide roller (4) is not greater than the linear velocity of the surface of the hot roller body (31).

7. The preparation method according to claim 4, characterized in that: The temperature of the hot roller (31) is not less than 40 degrees Celsius and the temperature of the hot roller (31) is not greater than 80 degrees Celsius.

8. The preparation method according to claim 4, characterized in that: It also includes a warp replacement step, which adopts a pagoda-style segmented warp replacement operation method.

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