An automated production line for PET strapping tape and a matching strapping machine

Abstract

The present invention discloses an automated production line of PET strapping tape and a matching tape splicing machine. The production line is composed of a material tank, a mixing tank, an extruder, a cooling water tank, a dewatering mechanism, a first three-wheel traction mechanism, an oven, a trackless traction and stretching mechanism, an embossing pair of wheels, a cooling and shaping box, a second three-wheel traction mechanism and a winding roller; the controller is also connected to the first three-wheel traction mechanism, the trackless traction and stretching mechanism, the embossing pair of wheels, the second three-wheel traction mechanism and the winding roller signal; the dewatering mechanism includes a frame, a dewatering roller group rotatably arranged on the frame, and the surface of the dewatering roller in the dewatering roller group is covered with a water-absorbing sponge. The tape splicing machine is composed of a base, a stand, a tape splicing head slidably arranged on the stand, a welding plate slidably connected to the stand through a transmission mechanism, and a top belt structure slidably connected to the base through a transmission mechanism, and the welding plate is located below the tape splicing head. The present invention has a good dewatering effect, does not need to use high-energy-consuming equipment such as a dryer, and reduces energy consumption.

Description

Technical Field

[0001] The invention relates to the molding or connection of plastics and the molding of materials in a plastic state; in particular, to an automatic production line of PET strapping tape and a matching strapping machine. Background Art

[0002] At present, most of the production lines of PET strapping tapes adopt mechanized production methods. Its advantage is that it can adapt to the rapid production of producers with low technical levels and quickly realize the output of goods. However, with the development of the market and technology, the disadvantages of this production method have also emerged. It relies too much on manual labor, and the quality level fluctuates during the production process.

[0003] Patent with publication number CN116141620A: A production line and production process for PET strapping tape, the production line includes an extrusion shaping device, a cooling water trough, a water removal traction device, a heating stretching device, a water removal extension device, a baking shaping device, a seven-roll shaping device, a water-cooled embossing device, an air-cooled shaping device, a five-roll traction device and a winding device connected end to end in sequence: the extrusion shaping device includes a first motor, a metering pump and a shaping mold, the first motor is connected to the metering pump, the metering pump is connected to the shaping mold, the shaping mold has multiple discharge ports, the multiple discharge ports are connected to one end of the cooling water trough, the first motor drives the metering pump to inject the PET blank into the shaping mold, and the strip blank is extruded from each discharge port into the cooling water trough. The dewatering device is an air-cooled shaping device or a dryer (see its original description: to the dewatering traction device 30 for surface dewatering, the traction dewatering device should have a roller or a rotating shaft that can be used to drive the strip embryo, and should also have a fan or a dryer that can remove moisture from the surface of the strip embryo... The air-cooled shaping device 90 is used to remove water from the surface of the strapping tape that has been water-cooled and finally shape it to obtain a finished strapping tape). If the air-cooling device is used alone, the dewatering effect is poor and the energy consumption is high. If a dryer is used, the energy consumption is high. Summary of the invention

[0004] The purpose of the present invention is to overcome the defects in the prior art and provide an automated production line for PET strapping tape, which has good water removal effect and does not require high-energy-consuming equipment such as a dryer, thereby reducing energy consumption.

[0005] To achieve the above purpose, the technical solution of the present invention is to design an automated production line for PET strapping tape, which is composed of a material tank, a mixing tank, an extruder, a cooling water tank, a water removal mechanism, a first three-wheel traction mechanism, an oven, a trackless traction and stretching mechanism, an embossing pair of wheels, a cooling and shaping box, a second three-wheel traction mechanism and a winding roller.

[0006] A material level meter is arranged in the mixing tank, and the material level meter is connected with the controller signal, and the controller controls the material in the material tank to be sucked into the mixing tank; the controller is also connected with the first three-wheel traction mechanism, the trackless traction stretching mechanism, the embossing pair of wheels, the second three-wheel traction mechanism and the winding roller signal.

[0007] A further technical solution is that the dewatering mechanism includes a frame, a dewatering roller group rotatably arranged on the frame, and the surface of the dewatering roller in the dewatering roller group is covered with a water-absorbing sponge. The dewatering roller with the surface covered with the water-absorbing sponge removes the surface moisture of the material belt during the conveying process, and finally only a very small power air cooling device such as a fan is needed to effectively remove the surface moisture of the material belt. The dewatering effect is good, and there is no need to use high-energy-consuming equipment such as a dryer, thereby reducing energy consumption.

[0008] A further technical solution is that the dewatering roller group is provided with several groups and each group includes a pair of rollers, and each pair of rollers includes a guide roller located above the material belt and a dewatering roller located below the material belt.

[0009] A further technical solution is that each pair of rollers of the dewatering roller group is staggered from top to bottom for reciprocating winding of the PET material belt. The reciprocating winding of the PET material belt with the dewatering rollers arranged below the material belt can avoid the problem of only removing moisture from one side of the material belt but not the other opposite side.

[0010] A further technical solution is that the rotation speed of the embossing wheel pair is higher than the rotation speed of the traction roller of the trackless traction and stretching mechanism; the embossing wheel pair embosses the material strip while traction and stretching it.

[0011] A further technical solution is that the extruder is a single screw extruder, the temperature of the extruder is 250℃-260℃; the temperature of the oven is 180±10℃, and the drying time is 4-6 hours. A single screw 3-5 section machine is used; the drying time is shortened to about 4-6 hours, and a chain extender is added to prevent degradation, increase the molecular weight by chain extension, and improve the intrinsic viscosity. The products made in this way will not become brittle and have a high scrap rate due to insufficient viscosity.

[0012] A further technical solution is that the stretching ratio of the trackless traction stretching mechanism is 2-2.5; the stretching ratio of the embossing wheel pair is 3.5-4. The stretching ratio is changed (the first stretching ratio is changed from 1.5 to 2-2.5; the second stretching ratio is changed from 4.5 to 3.5-4), the first stretching ratio is increased; the second stretching ratio is reduced, so that the total stretching ratio remains unchanged, the temperature of the material strip is increased when it reaches the embossing roller, the toughness of the material strip reaching the embossing roller is increased, and the probability of the material strip being crushed by the embossing roller is reduced.

[0013] The technical solution also provided by the present invention is a splicing machine for use with an automated production line of PET strapping tape. The splicing machine is used in conjunction with the automated production line of PET strapping tape, and is composed of a base, a stand, a splicing head slidably arranged on the stand, a welding plate slidably connected to the stand through a transmission mechanism, and a top belt structure slidably connected to the base through a transmission mechanism, wherein the welding plate is located below the splicing head. The top belt structure is slidably arranged to tightly abut one of the two ends of the strapping tape that needs to be spliced ​​and then drive the welding plate. By simply setting the position of the welding plate near the end of the strapping tape that is abutted, the waste of strapping tape caused by the splicing process (the splicing here refers to the process of splicing the two ends of the strapping tape when using the strapping tape to pack items, which is well known to those skilled in the art. The prior art uses iron buckle type, ligation type or hot melt overlap type to achieve the splicing of strapping tape) can be reduced as much as possible.

[0014] The advantages and beneficial effects of the present invention are: the surface moisture of the material belt is removed during the conveying process by using a dewatering roller with a water-absorbing sponge on the surface, and finally only a very low-power air cooling device such as a fan is needed to effectively remove the surface moisture of the material belt. The dewatering effect is good, and there is no need to use high-energy-consuming equipment such as a dryer, thereby reducing energy consumption.

[0015] The reciprocating winding of the PET material belt in conjunction with the dewatering roller disposed below the material belt can avoid the problem of only removing moisture from one side of the material belt but not the other opposite side.

[0016] Change the stretching ratio (the first stretching ratio is changed from 1.5 to 2-2.5; the second stretching ratio is changed from 4.5 to 3.5-4), increase the first stretching ratio; reduce the second stretching ratio, so that the total stretching ratio remains unchanged, the temperature of the material strip increases when it reaches the embossing roller, and the toughness of the material strip reaching the embossing roller increases, reducing the chance of the material strip being crushed by the embossing roller.

[0017] By means of a sliding top belt structure, one of the two ends of the strapping belt that needs to be connected is tightly abutted against each other and then the welding plate is driven. The welding plate only needs to be positioned near the end of the strapping belt that is abutted against each other to minimize the waste of strapping belt caused by the strapping process (the strapping here refers to the process of connecting the two ends of the strapping belt when using the strapping belt to pack articles, which is well known to those skilled in the art. The prior art uses iron buckle type, ligation type or hot melt overlap type to achieve strapping belt connection). BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of a first embodiment of an automated production line for PET strapping of the present invention;

[0019] Figure 2 yes Figure 1 Schematic diagram of water removal mechanism;

[0020] Figure 3 is a schematic diagram of a tape splicing machine in Embodiment 2 of the present invention;

[0021] Figure 4 yes Figure 3 A top view of

[0022] Figure 5 yes Figure 3 Side view of

[0023] Figure 6 yes Figure 3 A schematic diagram from another perspective after removing some components;

[0024] Figure 7 yes Figure 3 A schematic diagram from another perspective after removing some components;

[0025] Figure 8 is an exploded schematic diagram of a belt splicing machine and a water removal mechanism according to a second embodiment of the present invention;

[0026] Fig. 9 It is an exploded schematic diagram of the belt splicing machine and the second three-wheel traction mechanism of the second embodiment of the present invention;

[0027] Fig.10 is a schematic diagram of Embodiment 3 of the present invention;

[0028] Fig.11 yes Fig.10 An enlarged schematic diagram of the water removal mechanism;

[0029] Fig.12 yes Fig.11 Side view of the middle inclined plate and bottom plate portion;

[0030] Fig.13 is a schematic diagram of a fourth embodiment of the present invention;

[0031] Fig.14 yes Fig.13 Schematic diagram of the water removal mechanism;

[0032] Fig.15 yes Fig.14 Schematic diagram of the first three-roller turning structure and the water removal roller part on one side.

[0033] In the figure: 1. material tank; 2. mixing tank; 3. extruder; 4. cooling water tank; 5. first three-wheel traction mechanism; 6. oven; 7. trackless traction stretching mechanism; 8. embossing wheel pair; 9. cooling and shaping box; 10. second three-wheel traction mechanism; 11. winding roller; 12. water-absorbing sponge; 13. guide roller; 14. water-removing roller; 15. material belt; 16. extrusion strip; 17. base; 18. stand; 19. belt head; 20. welding plate; 21. top belt Structure; 22, outer frame; 23, bottom plate; 24, pulley transmission mechanism; 25, pressure plate; 26, slide rail; 27, reduction motor; 28, clamping block; 29, screw nut mechanism; 30, top plate; 31, second end; 32, top pressure elastic block; 33, inclined plate; 34, drainage hole; 35, curved baffle; 36, first roller; 37, second roller; 38, third roller; 39, first dewatering roller; 40, fourth dewatering roller; 41, third dewatering roller. DETAILED DESCRIPTION

[0034] The specific implementation of the present invention is further described below in conjunction with the accompanying drawings and embodiments. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and cannot be used to limit the protection scope of the present invention.

[0035] Embodiment 1: Figure 1 , Figure 2 As shown, the present invention is an automated production line for PET strapping tape, which is composed of a material tank 1, a mixing tank 2, an extruder 3, a cooling water tank 4, a dewatering mechanism, a first three-wheel traction mechanism 5, an oven 6, a trackless traction and stretching mechanism 7, an embossing pair of wheels 8, a cooling and shaping box 9, a second three-wheel traction mechanism 10 and a winding roller 11 which are arranged in sequence; a material level meter is arranged in the mixing tank 2, and the material level meter is connected to the controller signal, and the controller controls the material in the material tank 1 to be sucked into the mixing tank 2; the controller is also connected to the first three-wheel traction mechanism 5, the trackless traction and stretching mechanism 7, the embossing pair of wheels 8, the second three-wheel traction mechanism 10 and the winding roller 11 by signal; the dewatering mechanism includes a frame, a dewatering roller group rotatably arranged on the frame, and a surface of the dewatering roller 14 in the dewatering roller group is covered with a water-absorbing sponge 12. The dewatering roller group is provided with several groups and each group includes a pair of rollers, each pair of rollers includes a guide roller 13 located above the material belt 15 and a dewatering roller 14 located below the material belt 15; each pair of rollers of the dewatering roller group is staggered from top to bottom to be used for winding the PET material belt 15 back and forth. The rotation speed of the embossing wheel pair 8 is higher than the rotation speed of the traction roller of the trackless traction and stretching mechanism 7; the embossing wheel pair 8 embosses the material belt 15 while traction and stretching. The extruder 3 is a single-screw extruder 3, and the temperature of the extruder 3 is 250℃-260℃; the temperature of the oven 6 is 180±10℃, and the drying time is 4-6 hours. The stretching ratio of the trackless traction and stretching mechanism 7 is 2-2.5; the stretching ratio of the embossing wheel pair 8 is 3.5-4.

[0036] The process is as follows:

[0037] The raw material is sucked from the material tank into the mixing tank for mixing, and the extruder head heats the material and extrude it into an extruded strip 16, and then it is cooled with water and dehydrated, and then it is pulled by three wheels, and then heated in an oven (heated and stretched, 205°C, it was wide before), and then it is stretched and deformed by trackless pulling (the mechanism is five-wheeled pulling, stretched after heating, and narrowed; the oven heating is combined with the five-wheeled pulling, and the traction after heating can stretch the material strip, stretching the originally wide material strip into a narrow material strip), and then the embossing wheel (with patterns on it) embosses and pulls and stretches at the same time, and then cools and sets, and then continues to pull, and finally rolls up.

[0038] Embodiment 2: The difference from Embodiment 1 is that Figures 3 to 9 As shown in the figure (for the convenience of illustration, the first end of the strapping tape is not shown in the figure), a splicing machine for an automated production line of PET strapping tape is used in conjunction with the automated production line of the PET strapping tape, and the splicing machine is used in conjunction with the automated production line of the PET strapping tape, and comprises a base 17, a stand 18, a splicing head 19 slidably arranged on the stand, a welding plate 20 slidably connected to the stand 18 through a transmission mechanism (the transmission mechanism is well known in the art, and a reduction motor 27 is used to drive the pulley to rotate, and then a screw nut mechanism 29 is used to achieve lateral movement of the splicing head; and a similar mechanism is used to achieve vertical movement of the splicing head 19, which will not be described in detail), and a top strap joint 20 slidably connected to the base through a transmission mechanism. The strapping tape is composed of a structure 21, a welding plate 20 is located below the strapping head 19, and a top strap structure is located below the welding plate and is provided with two, which are respectively arranged on both sides of the first end of the strapping tape, and the top strap structure includes a reduction motor fixedly connected to the base, and the reduction motor is connected to a pulley transmission mechanism 24, and a pressing plate 25 is fixedly connected to the belt on the pulley transmission mechanism, and the pressing plate 25 covers the strapping tape at the end close to the strapping tape in the length direction so as to press the strapping tape, but the ends of the pressing plates 25 of the two top strap structures do not touch (that is, the ends of the pressing plates of the two top strap structures are provided with a spacing, and this spacing is smaller than the width of the strapping tape but greater than zero), and a slide rail for sliding the pressing plate is provided on the base.

[0039] The dewatering mechanism comprises a frame, which comprises an outer frame 22 composed of four rods, a vertical bottom plate 23 is fixedly arranged in the outer frame, a dewatering roller 14 is rotatably arranged on the bottom plate 23, and a card slot is arranged on the outer frame.

[0040] The second three-wheel traction mechanism also includes a frame, which includes an outer frame 22 composed of four rods, a vertical bottom plate 23 is fixedly arranged in the outer frame, and a card slot with the same size and shape as the aforementioned card slot is also provided on the outer frame, and a card block 28 adapted to the card slot is provided on the base 17. In this way, when the production line is working, the belt splicer can be installed on the dewatering mechanism (and the second three-wheel traction mechanism) to press the material belt (specifically, if the material belt breaks, the belt splicing head arranged on the vertical frame is driven to press the material belt to the dewatering roller (and the traction roller of the second three-wheel traction mechanism) to prevent the material belt from being broken. In order to prevent the material belt from breaking and detaching from the dewatering roller and the rollers on other mechanisms, it is convenient to connect the material belt in time after it breaks, and reduce the working hours of rewinding after the break), there can be three splicing machines matching the production line (one of which is used as a splicing machine, and the other two are used as machines for pressing the material belt; that is, the splicing machine is a dual-purpose machine for splicing and pressing the material belt); when the material belt breaks, the controller controls the reduction motor to operate so that the rollers on the splicing head of the splicing machine press against the material belt at the dewatering mechanism and the second and third wheel traction mechanisms, so as to keep the material belt wound on various mechanisms, so that the previous work can be continued faster after the splicing.

[0041] When it is necessary to pack the items, the strapping tape on the winding roller is wound around the items and then cut off. Then, one end (defined as the first end) passes from the bottom of the base and abuts against the top plate 30 below the tape head (the top plate 30 is used to limit the upward position of the first end), and the other end (defined as the second end 31) of the strapping tape passes from the top of the base (the base is provided with a through hole for the strapping tape to pass through) and is pulled tightly but temporarily does not contact the first end of the strapping tape (that is, the first end vertically abuts against the top plate 30, and the second end 31 is tightened in an inclined direction to avoid the second end from contacting the first end). Then, the driving mechanism drives the welding plate 20 to move so that the upper end portion of the second end 31 is hot-melted and overlapped with the end of the first end. The welding plate 20 is set at a position slightly below the end edge of the first end (for example, one centimeter or two centimeters below the end edge of the first end).

[0042] Embodiment 3: The difference from Embodiment 1 is that Figures 10 to 12 As shown, the dewatering roller group includes a plurality of dewatering rollers 14 (only dewatering rollers are provided in the dewatering roller group, and guide rollers are excluded), and the dewatering rollers are staggered from top to bottom to be used for reciprocating winding of the PET material strip.

[0043] The dewatering mechanism also includes a removal structure arranged on one side of the dewatering roller and used for removing water from the water-absorbing sponge.

[0044] The removal structure includes a top-pressure elastic block 32 (for removing moisture from the water-absorbing sponge) disposed below the water-removing roller (more precisely, at the non-material belt contact portion of the water-removing roller), the top-pressure elastic block 32 being made of rubber material, fixedly connected to the frame, the top-pressure elastic block being disposed against the water-absorbing sponge of the water-removing roller 14 and causing the water-absorbing sponge to be deformed by pressure (that is, the uppermost end of the top-pressure elastic block is located inside the outermost circle of the water-absorbing sponge 12 when it is not under pressure), located below the top-pressure elastic block and on the subsequent material belt (the subsequent material belt here refers to the material belt located below the top-pressure elastic block 32) The frame includes an outer frame 22 composed of four rods, a vertical bottom plate 23 is fixedly arranged in the outer frame, a water removal roller 14 is rotatably arranged on the bottom plate, the water removal hole 34 is horizontally penetrated through the bottom plate 23, and the inclined direction of the inclined plate 33 is gradually inclined upward in the direction away from the bottom plate 23 to ensure that the water removed from the water absorbent sponge 12 accumulates at the water removal hole. A curved baffle 35 can also be arranged on the edge of the inclined plate to adapt to the situation that the subsequent material strip is not conveyed obliquely downward or obliquely upward (so that the curved baffle can block or receive the water removed from the water absorbent sponge) and to prevent the removed water from leaking from the edge of the inclined plate (that is, the curved baffle 35 and the inclined plate 33 form a groove-shaped water receiving component).

[0045] A pressure elastic block for squeezing the absorbent sponge on the periphery of the roller surface is arranged below the dewatering roller, so that the moisture on the absorbent sponge is removed immediately after the dewatering roller absorbs water, and the water removed from the absorbent sponge by the pressure elastic block is prevented from falling onto the subsequent material belt, so that the moisture on the material belt can be continuously removed online. The dewatering effect is good and the energy consumption is hardly increased. In addition, since the dewatering rollers are staggered from top to bottom, and the material belt is wound back and forth, the two sides of the material belt can be dewatered (or absorbed) in turn, which enhances the dewatering effect. In this case, if the number of dewatering rollers is sufficient (for example, 5 as shown in the figure, of course, more can be set according to actual conditions), it is not even necessary to set a low-power blowing device such as a fan to ensure the required drying of the material belt surface.

[0046] Embodiment 4: The difference from Embodiment 3 is that Figures 13 to 15As shown, the removal structure is not a top-pressure elastic block arranged under the dewatering roller, but: the removal structure includes the rear contact point of the material belt located at the dewatering roller 14 (compared with the rear contact point of the material belt, the first contact point of the material belt of the dewatering roller, that is, the position where the material belt conveyed from the cooling water tank first bypasses the dewatering roller is the so-called "first contact point of the material belt of the dewatering roller"; or relative to the previous dewatering roller, the "first contact point of the material belt of the dewatering roller" of each dewatering roller refers to the position of the current dewatering roller where the material belt conveyed from the previous dewatering roller / the previous three-roller steering structure first contacts ) is provided with a three-roller steering structure (for removing moisture from the absorbent sponge); there are M dehydrating rollers (M=6 in the figure) (the last dehydrating roller 14 is the final dehydrating roller) (respectively the first dehydrating roller 39, the second dehydrating roller... and so on until the last dehydrating roller, which is also the final dehydrating roller), and there are M-2 three-roller steering structures (respectively the first three-roller steering structure, the second three-roller steering structure... and so on), and the three-roller steering structure includes three steering rollers arranged in sequence along the conveying direction (or traction direction) of the material belt, which are the first Roller 36, second roller 37 and third roller 38, the material belt passes around the dewatering roller and then passes around the first roller 36, second roller and third roller in sequence, the material belt between the second roller and the third roller is tangent to the outer surface of the dewatering roller 14 (or slightly closer to the center of the dewatering roller to ensure that the water-absorbing sponge is under pressure so that the material belt can be quickly removed by traction or conveying process after absorbing water) (the tangent point here is also the rear contact point of the material belt of the dewatering roller); the first three-roller steering structure is arranged on one side of the second dewatering roller, and the material belt steering structure from the first three rollers is tangent to the outer surface of the dewatering roller 14 (or slightly closer to the center of the dewatering roller to ensure that the water-absorbing sponge is under pressure so that the water-absorbing sponge of the dewatering roller can be quickly removed after absorbing water). The material belt wound on the third roller of the structure "rubs" (rests against) the rear contact point of the material belt of the first dewatering roller 39 (below the dewatering roller in the figure), and then winds around the third dewatering roller 41 to reach the second three-roller steering structure; the material belt wound or conveyed from the third roller of the second three-roller steering structure is wound around the fourth dewatering roller 40 and reaches the third three-roller steering structure; and so on and so forth; the material belt wound or conveyed from the fourth three-roller steering structure is wound around the final dewatering roller and reaches the steering roller and then reaches the first three-wheel traction mechanism to be tractioned. An inclined plate 33 as described in the second embodiment is also provided below the second roller and between the first contact point of the material belt and the rear contact point of the material belt, and a drainage hole 34 is provided on the bottom plate, and a curved baffle 35 can also be provided on the edge of the inclined plate.

[0047] Compared with the second embodiment, no additional components are set: the top pressure elastic block. By setting the dewatering roller and the steering roller, the winding method and the winding method, the water on the water-absorbing sponge after the dewatering roller absorbs water can be immediately removed by setting the material belt conveying path and the winding path (the water on the water-absorbing sponge is removed by the material belt itself or by the setting of the material belt conveying direction, which is a clever idea; and it is prevented that the water removed from the water-absorbing sponge by the top pressure elastic block falls on the subsequent material belt again, and no other additional components such as the top pressure elastic block are required), and the water on the material belt can be continuously removed online. The dewatering effect is good and the energy consumption is almost not increased. In addition, since the dewatering rollers are staggered from top to bottom, the material belt is wound back and forth, and the two sides of the material belt can be dewatered (or absorbed) in sequence, which enhances the dewatering effect. In this case, if the number of dewatering rollers is sufficient (for example, 6 are shown in the figure, and of course more can be set according to actual conditions), it is not even necessary to set a low-power blowing device such as a fan to ensure the required drying of the material belt surface.

[0048] Embodiment 5: The difference from Embodiment 1 is that a cooling pool is immediately arranged after the cooling water trough, and a water removal mechanism is arranged after the cooling pool; the length of the cooling water trough is shortened to two-thirds of the length of the cooling water trough in the prior art; the temperature of the cooling water in the cooling water trough is higher than the temperature of the cooling water in the cooling water trough in the prior art; after cooling, it is first heated by a hot water trough, and then further cooled by a cooling pool (the temperature of the cooling pool is lower than the temperature of the cooling water trough, which is consistent with the temperature of the cooling water trough in the prior art, generally below 35°C, preferably around 20°C), so as to avoid the problem that the surface of the extruded strip reaches the desired state characteristics due to the cooling water of a lower temperature all at once, but the inside is not fully cooled.

[0049] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. An automated production line for PET strapping, characterized in that: It consists of a material tank, a mixing tank, an extruder, a cooling water tank, a water removal mechanism, a first three-wheel traction mechanism, an oven, a trackless traction stretching mechanism, an embossing wheel pair, a cooling and shaping box, a second three-wheel traction mechanism and a winding roller. A material level meter is arranged in the mixing tank, and the material level meter is connected to the controller signal, and the controller controls the material in the material tank to be sucked into the mixing tank; the controller is also connected to the first three-wheel traction mechanism, the trackless traction stretching mechanism, the embossing pair of wheels, the second three-wheel traction mechanism and the winding roller signal; The dewatering mechanism comprises a frame, a dewatering roller group rotatably arranged on the frame, and a surface of the dewatering roller in the dewatering roller group is covered with a water-absorbing sponge; The dewatering roller group is provided with a plurality of groups and each group includes a pair of rollers, and each pair of rollers includes a guide roller located above the material belt and a dewatering roller located below the material belt; The pairs of rollers of the dewatering roller group are staggered from top to bottom in sequence for winding the PET material strip back and forth; The rotation speed of the embossing wheel pair is higher than the rotation speed of the traction roller of the trackless traction and stretching mechanism; the embossing wheel pair embosses the material strip while traction and stretching it; The extruder is a single-screw extruder, and the temperature of the extruder is 250°C-260°C; the temperature of the oven is 180±10°C, and the drying time is 4-6 hours; The stretching ratio of the trackless traction and stretching mechanism is 2-2.5; the stretching ratio of the embossing pair of wheels is 3.5-4; the sum of the stretching ratios of the trackless traction and stretching mechanism and the embossing pair of wheels is 6.

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