WO2013071662A1 - Method for producing packing belt and complete equipment - Google Patents

Abstract

A method for producing a packing belt comprises: plastifying and fusing a material, and extruding through a forming die mouth to form a strip-shaped fused blank; dragging the blank for cooling and shaping and stretching the blank for the first time; heating the blank after the blank is dragged for cooling and shaping, and meanwhile, performing stretching for the second time, to obtain a semi-finished belt; performing embossing on a surface of the semi-finished belt; dragging the embossed semi-finished belt to perform heating and shaping, cooling and shaping, and completely forming a finished belt after stress relieving; measuring the finished belt and then rolling the belt, to obtain a final product. A complete equipment for producing the packing belt is further disclosed, comprising: a strong extruder, a cooling water tank, a first dragger set, a stretching oven, a second dragger set, an embosser set, a shaping oven, a shaping water tank, a third dragger set, and a roller that are sequentially arranged, so as to implement continuous processing from extruding a packing belt material to form a strip-shaped fused blank to rolling the finished belt. Through the production method and complete equipment of the present invention, a deviation in specifications of the packing belt can be reduced and the tensile strength can be improved, thereby ensuring the product quality.

Description

 Packing belt production method and complete set of equipment This application claims the priority of the Chinese patent application filed on November 17, 2011, the Chinese Patent Office, the application number is 201110367206.4, and the invention name is "packing belt production method and complete equipment". This is incorporated herein by reference. Technical field

 The invention relates to the field of dressing technology, in particular to a baggage production method and a complete set of equipment, which can be applied to a packaging belt for polypropylene and polyethylene materials.

Background technique

The lightweight strapping tape that is widely used in the outer packaging of the product is a plastic packing tape (polypropylene packing tape). The general process is made of PP polypropylene, melt-molded by an extruder, and at least twice. The stretching process, the tempering process, and the final shaping. Different processes have different tensile deformation processes, and there are also large differences in product specification deviation and tensile force control. The existing processes all have certain defects, and are illustrated by way of example: For example, a polyester packing belt and its processing process include the following steps: (1) dehumidifying and drying the polyester raw material; (2) melting and extruding the polyester raw material Thick slab and qualitative; (3) at least two times of stretching the extruded slab, heating the slab before each stretching; (4) embossing the stretched tape; (5) back Hot setting; (6) cooling and setting; (7) winding. The main drawback is that the temperature at the time of stretching is high, which easily breaks the molecular structure, thereby affecting the tensile strength of the packing tape. For another example, a basic process for manufacturing a packaging tape is as follows: (1) melt-setting a raw material to obtain strip-shaped or flaky PET; (2) cooling in a water tank; (3) stretching by a first The device performs one stretching; (4) secondary stretching by the second stretching device; (5) the strip plastic is guided to the furnace to be heated to a glass temperature; (6) by the third pulling The stretching device performs three stretching; (7) heating by the sizing device; (8) cooling in the cooling device; (9) four stretching by the fourth stretching device; (10) the plastic sheet is wound around the winding Winding is performed in the winding device. The main drawback is that it is difficult to precisely control the tension during the stretching process, and problems such as uneven thickness and large skewness are likely to occur. The above two processes are prone to product defects, and are mainly used for PET raw materials, and it is difficult to meet the production requirements of PP polypropylene raw materials, so it is necessary to design a new production process and corresponding complete sets of equipment.

Summary of the invention

 In view of the above, an object of the present invention is to provide a method and a complete set of equipment for packaging straps, which contribute to improving the quality of the strap. In order to solve the above technical problem, the technical solution provided by the present invention is a packaging tape production method, comprising the following steps: (1) plasticizing and melting the packing tape material, and then extruding a certain thickness from the lip of the forming die and a strip of preform with a width of strip melt;

 (2) Traction strap blanks are cooled and shaped and stretched once to meet the requirements of different specifications for packing blanks;

 (3) The slab of the packing belt after the traction cooling and setting is heated, and the second stretching is simultaneously performed at the preset stretching temperature, and the semi-finished belt of the packing belt is obtained after the stretching and deformation;

 (4) embossing on the surface of the strapping semi-finished strip;

 (5) After the embossing, the semi-finished tape of the strapping belt is heated and shaped, cooled and shaped, and completely removed into a finished strip of the strap after the stress is removed;

 (6) After the finished product of the strapping belt is metered, the winding is completed, and the final product of the strapping belt is obtained.

 Preferably, before the step (1), the polypropylene new material and the recycled material are mixed, and then the auxiliary materials are added, respectively, according to the formulation requirements, and the mixture is uniformly mixed to obtain the packing material.

 Preferably, the cooling is set in water at 18 ° C to 20 ° C, and the water inlet angle and the water inlet length are adjusted to meet the requirements of the blanks of different specifications.

 Preferably, in step (2), the cooling is shaped by dynamic underwater spraying to utilize the high-pressure water flow to drive the flow of water on the surface of the primordial, to immediately remove the hot bubbles on the surface of the blast, and to improve the quality of the priming.

Preferably, in step (3), the stretching is performed by self-circulating wind-heating, and the stretching is maintained. The temperature is constant at 110. C~130. C; and reciprocating winding method for heating, increasing the total length of the tensile deformation line is more than 4 times the length of the tensile deformation zone.

 Preferably, in step (4), the embossing is performed pneumatically, so that the multi-cylinder synchronous linkage mechanism and the embossing roller four-way adjusting device automatically adjust according to the tension, compensate the embossing depth, and adjust the horizontal and vertical bidirectional embossing positions. .

 Preferably, in step (5), the shaping is performed by photothermal heating, and the reciprocating winding method is used for heating, so that the total length of the heating and setting line is more than four times the length of the heating and setting region.

 Preferably, in step (6), the automatic winding of the strap is achieved by the automatic control of the tension.

 Preferably, in each step, the synchronous flexible linkage method is used for traction, and the traction line speed can reach 280 m/min.

 On the basis of this, the present invention accordingly provides a packaged complete set of equipment, including a powerful extruder, a cooling water tank, a first traction unit, a stretching oven, a second traction unit, an embossing unit, a shaping oven, a shaping water tank, and a The three traction unit and the tape winding machine, the above-mentioned various devices are arranged in order to realize continuous processing of the strip blank from the strip material melted from the strap material to the finished strip of the strap.

 Compared with the prior art, the invention can effectively reduce the deviation of the packing tape specification, improve the tensile strength, and ensure the product quality by optimizing the stretching and setting process of the packaging tape. Specifically, the production method and the complete set of the invention can be obtained, but are not limited to the following beneficial effects: 1. Wide application range: The cooling water tank with adjustable water inlet angle and water inlet length can be used for ordinary packing belts and light packing belts. , thin belts, narrow belts and other types of belts, through the high-precision dual-channel quick-change die can achieve 5mm to 19mm different specifications of the same machine production, a wide range of applications.

 2, the heating area is long: the use of inside the box and self-circulating wind and heat technology, can effectively ensure that the temperature inside the box is constant, the material belt can be traversed in the box, so that the heating length is increased to the length of the heating box 4 More than double, the strip is slowly stretched during the baking heating operation to increase the creep resistance and reduce the influence of the tensile internal stress on the skewness.

3, low heating temperature: using low temperature stretching technology, stretching temperature is controlled at 110 ° C ~ 130 ° C Between, this will not only destroy the molecular structure, but also favor the molecular orientation, to obtain a stretching ratio of up to 15 times, achieving ultra-light weight.

 4. Fast speed and high production volume: With a variety of unique technologies, the constant traction line speed can reach 280m/min, and the daily output can reach 2400kg, which greatly improves the production efficiency.

 5. Embossing rules and beauty: The double-belt pneumatic embossing system adopts four-cylinder synchronous linkage, which automatically adjusts the pressure by pressure compensation, and can fine-tune the position of the pressure roller in four directions, thus avoiding the packing belt caused by embossing. The packing belt has a thick and thin hook, a large skewness, and a disordered pattern, which affects the quality, performance and appearance of the strap.

 6. Good quality and stable performance: The synchronous flexible linkage technology is used to realize the intuitive digital display and intelligent compensation of the traction speed to ensure the constant traction and the stretching multiple of the whole line at high speed. The ultra-long constant low temperature achieves a draw ratio of up to 15 times, which not only ensures the product quality, but also achieves an ultra-light and high-grade strapping of less than 3.3 g/m.

 7. Low energy consumption and low cost: the low temperature self-circulating constant temperature system is used to greatly improve the thermal energy efficiency, and the PLC man-machine system is implemented. Only one person can complete the whole set of equipment control, which can greatly improve the production efficiency and reduce Cost of production.

DRAWINGS

 BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a process flow diagram of a method for producing a packaging tape according to the present invention; and Fig. 2 is a composition diagram of a packaging device of the present invention.

detailed description

In order to make those skilled in the art better understand the technical solutions of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. Referring to Figure 1, there is shown a process flow of a preferred embodiment of the method for producing a bale tape of the present invention. The process is adapted to an intelligent polypropylene duplex station strapping unit. The basic process flow in the production of polypropylene strapping is: mixing the new polypropylene material with the recycled material, adding the necessary auxiliary materials, measuring separately according to the formulation requirements, mixing and hooking, adding to the extruder, plasticizing and melting, Then from molding The strip of the die is extruded with a strip of melt of a certain thickness and width; the shaped initial embryo is cooled in the water; the secondary drawing is carried out by oven heating to achieve the required shape and size specifications; and then the embossing machine is introduced. Perform surface embossing; quickly enter the shaping oven and shape the water tank to remove stress under the action of the third traction force; the finished product belt passes through the metering device and the tension control system and then enters the tape winding machine to form a polypropylene packing tape. Referring to Figure 1, each process step of the strap production method is further described in detail below:

5101. Adding materials: mixing the new polypropylene material with the recycled material, adding the auxiliary materials as needed, separately metering according to the formulation requirements, and uniformly mixing to obtain a mixture material; the step is automatically completed by the loading system, and the materials are added during the feeding process. Drying is carried out to reduce the moisture to less than 0.1%.

5102. The plasticizing and melting of the material is specifically: adding the mixed material to the extruder for plasticating and melting, and the extruder comprises components such as an extrusion device (such as a screw), a filter net and a die, so that the material is simultaneously advanced during the material advancement process. The material is heated, and after the molten material passes through the filter, the preform is extruded from the die.

5103. Pre-extrusion The plasticized and melted material is extruded from the lip of the forming die, thereby forming a stripped preform of a strip melt having a certain thickness and width. Preferably, a replaceable double die can be provided, thereby replacing the forming die to realize the same machine production of different specifications of 5 mm to 19 mm. S104. After one-shot extrusion, the first blank is cooled and shaped, and the primary blank is pulled at the same time to be stretched to a preset size.

S105, the initial cooling setting is specifically at 18. C~20. The water in C is cooled and shaped, and the inlet water angle and the water inlet length of the preform are adjusted to meet the requirements of the blanks of different specifications. In particular, through dynamic The underwater spraying method is used for cooling and shaping, so that the directional flow of the surface water of the primary blank can be driven by the jetted high-pressure water flow, and the hot bubbles adsorbed on the surface of the primary blank can be removed in time to improve the forming quality of the primary blank.

5106. Tensile heating In order to perform secondary stretching, the preform is heated to a glass transition temperature (100 C or more). Preferably, it is heated in a stretching oven to maintain a constant stretching temperature of 110. C~130. C (Because the temperature is too high, it affects product uniformity). In order to ensure that the heating time is long enough, the reciprocating winding method can be used to increase the total length of the tensile deformation line by more than 4 times the length of the tensile deformation zone.

5107. Secondary stretching Secondary stretching is performed simultaneously with stretching and heating (step S106), and after performing secondary stretching deformation at the stretching temperature, the desired shape and dimensional specifications are achieved. At this time, the specifications of the preform are close to the specifications of the finished strip, that is, the semi-finished strip is obtained.

5108, the surface embossing surface embossing adopts pneumatic embossing method, so that the multi-cylinder synchronous linkage mechanism and the embossing roller four-way adjusting device automatically adjust according to the tension, compensate the embossing depth and adjust the horizontal and vertical bidirectional embossing positions. Helps improve product quality.

5109. Styling heating can be heated and fixed by photothermal method, and heated by reciprocating winding method at the same time. The total length of the heating and setting line is increased by more than 4 times the length of the heating and setting area, thereby ensuring uniform heating and avoiding sudden heat.

5110. Traction While heating and setting, the semi-finished product is pulled to the shaped water tank for rapid cooling. In order to ensure the quality of the product, this step and the first two stretching steps are carried out by synchronous flexible linkage, wherein the traction line speed can reach 280m/min.

Sill, cooling stereotype The heat-set material is quickly cooled in a shaped water tank, thereby completely eliminating stress and thus being completely formed into a finished tape.

5112. There are many kinds of measurement methods, which can be measured by the product of speed and time (length of finished tape), which can be automatically completed by the control system.

5113. Finished tape reeling After the finished product is finished, the finished tape passes through the metering device and the tension control system (guarantee the appropriate size of the winding force) and then enters the reeling machine to rewind, thus obtaining the packing tape.

5114. Packaging, storage After the finished product is packaged and put into storage, the whole product production process is completed. The embodiment shown in Fig. 1 comprises a three-drawing stretching step, two heating steps and two cooling steps, which can effectively reduce the deviation of the packing tape specification and optimize the stretching by optimizing the stretching and setting process of the packing tape. Strength, better quality assurance.

The packaging device of the present invention will be described. Referring to Fig. 2, there is shown a structure of a preferred embodiment of the packaged belt device of the present invention, which is a complete set of two intelligent lightweight baling belts of PP pellets, model YZJPP [QD2-V]. The complete set of equipment consists of a powerful extruder 1, a cooling water tank 2, a first traction unit 3, a stretching oven 4, a second traction unit 5, an embossing unit 6, a sizing oven 7, a sizing tank 8, a third traction unit 9 and The tape winding machine 10 and the like are constructed, and each device uses a part of the structure in the prior art, and is improved as follows.

 As shown in Figure 2, the standard installation of the lightweight baling unit is required to be arranged in a straight line, that is, the equipment is arranged in sequence to realize the strip blank from the strap material to the strip blank to the packing belt. Continuous processing of the finished product with the winding, the following describes each device separately:

 1, strong extruder

Powerful extruder (main unit) 1 Includes the transmission part and the forming part, where: The frequency conversion speed motor and the special hard tooth surface reducer for the plastic machine are composed; the molding part is composed of a screw barrel, a machine head and a die. During operation, the raw materials are quantitatively transported into the hopper of the automatic dryer through an automatic feeding system (not shown), and the dried material automatically enters the barrel, so that the material is heated and strongly extruded in the barrel, and then discharged by the material. The die at the location is pressed out of the original embryo of the packing belt, and the preform is a strip melt having a certain thickness and width.

 The characteristics of the powerful extruder 1 are: a, the extrusion amount is large; b, the extrusion amount is uniform and constant; c, the screen change is quick; d, the belt specification can be adjusted.

 2, cooling water tank

 The primaries for rapid cooling of the main port die are provided with a water inlet angle adjusting device and a water inlet length adjusting device, so as to meet the requirements of different initial blasts by adjusting the water inlet angle and the water inlet length. In addition, the cooling water tank 2 is provided with a dynamic jet refrigeration system, so that the water flow drives the water of the surface of the blank of the packing belt to flow directionally, thereby timely removing the hot air bubbles attached to the surface of the blank, thereby improving the quality of the preform.

 The characteristics of the cooling water tank 2 are: a, the angle and length of the water inlet can be adjusted; b, the self-circulating water in the tank; c, the cooling setting is fast; d, the initial embryo size is stable.

 3, the first traction unit

 It consists of a variable frequency speed regulating motor, a self-locking speed reducer, a traction roller synchronous transmission mechanism, 5~7 traction rollers, a pneumatic pressure belt device, etc. It transports the shaped embryos to the circulating air-heat stretching oven. As shown in Fig. 2, according to the direction of the process flow, the outer diameters of the traction rolls are sequentially increased (the direction is increased from right to left), which helps to optimize the tension of the blank and improve the product quality.

 The characteristics of the first traction unit 3 are: a. Synchronous flexible transmission, running balance, low noise; b, pressure belt can be adjusted; c, strong adhesion, effectively preventing slippage.

 4, stretching oven

 The stretching oven 4 is a circulating air-heating stretching oven, which is composed of a drying chamber, an adjustable winding roller, a heater, a built-in tension device, a power traction device, a fan, etc., and functions to heat the primordial to reach the stretching station. The preset temperature is required, and at the same time, the tensile deformation is realized inside the oven of the oven.

The characteristics of the stretching oven 4 are as follows: a. Reciprocating winding structure, the total length of the heating circuit is increased to more than 4 times of the heating box; b. The wind-heat self-circulation system can keep the indoor temperature to a maximum extent; C, fast heat collection, high heat utilization rate, low energy consumption; d, constant power, can effectively link with the second traction, increase the scope of application (can meet the requirements of recycled materials).

 5, the second traction unit

 It is composed of variable frequency speed regulating motor, traction roller synchronous transmission, 5~7 traction rollers, pneumatic pressure belting device, etc. It conveys the packing belt stretched in the oven to the embossing machine through the traction roller to realize the next step. Embossing process. Similar to the first traction unit 3, the outer diameter of each traction roller is sequentially increased to optimize the tension experienced by the object belt.

 The characteristics of the second traction unit 5 are: a, synchronous flexible transmission, running balance, low noise; b, pressure belt can be adjusted; c, strong adhesion, effective prevention of slip; d, constant traction, effective and third The traction unit is linked to precisely control the draw ratio.

 6, embossing unit

 The embossing unit 6 is a pneumatic embossing unit, which is powered by a variable frequency speed regulating motor, drives the embossing main roller to rotate by a synchronous flexible transmission mechanism, and realizes horizontal and vertical fine adjustment of the embossing roller by a combined flower roller mechanism, and effectively controls The degree of coincidence of the pattern. Preferably, the embossing unit is provided with a tension adjusting device for adjusting the tension of the embossed semi-finished belt of the packing belt, which contributes to the improvement of product quality.

 The characteristics of the pneumatic embossing unit 6 are as follows: a. Undamped rail carrier, the flower roller moves smoothly; b. The embossing roller is horizontally and longitudinally finely adjusted to control the pattern overlap; c. The adjustable driving cylinder has adjustable inlet and outlet pressure. Precise control of embossing depth; d, tension control device, automatically adjust according to the tension.

 7. Styling oven

 The shaping oven 7 is a photothermal shaping sizing oven, which is composed of a drying chamber, an adjustable winding roller, a heater, etc., and the ultra-long shaping channel can effectively eliminate the tensile internal stress and greatly reduce the yield skewness.

 The characteristics of the shaping oven 7 are as follows: a. The adjustable winding roller adopts a reciprocating winding structure to increase the total length of the heating circuit to more than 4 times the length of the heating chamber drying chamber; b. Infrared light heating system, high efficiency; c , no power automatic constant pressure design, to avoid the occurrence of secondary tensile stress; d., embedded water tank design, shorten the length of complete equipment.

 8, shaped water tank

The shaped belt is quickly cooled and shaped, and the water is removed to ensure the low temperature winding of the next process. An overflow tank may be provided in the shaping water tank 8, which is installed on the side wall of the shaping water tank 8. Upper, and the top surface of the overflow tank is flush with the normal water level surface of the shaping water tank 8, so that when the water of the shaping water tank 8 overflows from the overflow port, no corrugation occurs, which is advantageous for improving product quality. Similarly, the cooling water tank 2 can also adopt a similar overflow tank structure, which will not be described herein.

 The shaping water tank 8 is characterized by: a. adopting a reciprocating winding structure, adjusting the length of the cooling line according to the tape forming specification (variable bypass mode); b, high-pressure self-priming water removal system, instantly removing surface adhesion water; c. Unpowered automatic centering guide roller to avoid secondary tensile stress; d. Built-in water tank design, shortening the length of complete equipment.

 9, the third traction unit

 It consists of a variable frequency speed control motor, a belt drive, a traction roller, a belt press device, and a metering (metering) device. The formed belt is conveyed to the winder 10 and the meter is realized at the third traction. The third traction unit 9 adopts a double-shaft four-wheel structure, which not only saves space, but also realizes double-belt independent traction. Preferably, the roller diameters of the main and auxiliary traction rollers of the third traction unit 9 are differentially designed to fully ensure the relaxation of the semi-finished tape of the packaged belt after shaping to reduce the internal stress and improve the quality of the finished product.

 10, tape winding machine

 The tape winding machine 10 is a double belt constant force winding machine, which is composed of a torque motor, a belt transmission mechanism, a gear belt and a reciprocating stroke mechanism. The gears are configured with different speed ratios, and the products of different types can be wound up. In the end, it will turn the qualified product into a single piece of product with the specified shape and quality. Preferably, the double-belt constant force reeling machine 10 increases the design amount alarm device to ensure orderly and safe production.

 In the complete set of equipment, the first traction unit 3, the second traction unit 5 and the third traction unit 9 adopt synchronous synchronous linkage mode to perform traction at a constant traction speed. In particular, the traction rollers in the three tractor units can be designed with a limit shoulder to prevent deviations in the movement of the belt. In addition, the complete set of equipment is provided with a PLC control system for realizing each device to operate according to predetermined parameters, thereby improving control precision and reducing labor intensity. It can be seen that the above embodiments adopt, but are not limited to, the following technologies, which can achieve significant beneficial effects, specifically:

 1. Adopting involute winding and tension control technology

The reciprocating stroke mechanism is used to ensure the traction power running in the same direction, and the gear combination pairing is performed according to different requirements, and the tension automatic control winding can be performed on the straps of different specifications. The advantages of the involute winding technology (including the metering device and the tension control device) are as follows: (1) The reciprocating stroke mechanism ensures the traction power to run in the same direction, avoiding the commutation pause phenomenon; (2) Gear combination according to different requirements Pairing, increase the scope of application; (3) Automatic tension control to achieve fast winding, eliminating human factors.

 2, using synchronous flexible linkage technology and low temperature constant force internal stretching technology

 Synchronous flexible linkage technology is adopted to realize intuitive digital display and intelligent compensation of traction speed, ensuring constant traction force and draw ratio during high-speed operation of the whole line; using low-temperature constant-force internal stretching technology, independent heating system using wind-heat self-circulating stretching oven The closed loop system is formed with the drying chamber, and the double bypass technology is adopted in the drying chamber, and the total length of the heated line is 4 times of the length of the heating area, and the maximum stretching ratio of the packing belt can be 15 times.

 The advantages of using synchronous flexible linkage technology (requires the second and third traction units and the stretching oven to work together) and the low-temperature constant-force internal stretching technology are as follows: (1) realize the intuitive digital display and intelligent compensation of the traction speed to ensure high-speed operation of the whole line. The traction force and the stretching ratio are constant; (2) The drying chamber adopts a multi-stage winding roller method, so that the length of the heating zone of the packing belt in the drying chamber reaches four times of the total length of the heating chamber, so that the packing belt is gradually heated slowly and gradually uniform throughout the drying chamber. Stretching, enhance the creep resistance of the strapping; (3) Through the change of the stretching device in the drying chamber, the operation of the finished strip of 5mm ~ 19mm can be realized, and the online speed of the whole set of equipment can be increased to 280m/min.

 3, using strapping light heat setting technology

 Through the infrared light thermal system and the traction roller with the difference of the diameter, the packing belt is heated for a long distance, and the appropriate tensile force is used to change the stress distribution in the original belt; the traction differential mechanism is adopted, and the line speed difference between the main roller and the auxiliary roller is adopted. Realize the elimination of stress in the packing belt.

 The advantages of the packaged photothermal setting technology (including embedded shaped water tank and self-priming water removal system) are as follows: (1) Using external force to change the original stress distribution, and promoting the distribution of stress distribution; (2) Eliminating the variation of the traction roller diameter Stress, reduce the skewness of the packing belt; (3) Uniform and constant heat, avoiding the phenomenon of sudden heat; (4) Shortening the setting time and improving the quality of the setting.

 4, using pneumatic embossing technology

The cylinder synchronous linkage mechanism and the flower roller four-way adjustment device can automatically adjust and compensate the embossing depth and the lateral and vertical bidirectional adjustment pattern positions according to the tension. The advantages of the pneumatic embossing technology (including the tension control device) are: the cylinder synchronous linkage, the pressure compensation automatically adjusts the pressure, and the position of the pressure roller can be finely adjusted in four directions, thereby avoiding the packing belt thickness caused by the embossing of the packing belt. The hook, the large skewness, the disordered pattern, etc. affect the quality, performance and appearance of the strap.

 5, using a ^ ^ tool technology

 The flow control ensures that the initial weight of the two packing belts is the same, and the thickness of the two original belts can be adjusted separately to achieve the same initial embryo size and the same weight.

 The advantages of the one-out two-die technology are as follows: (1) A two-stage pressure buffer tank is added in the mold body to solve the split flow splitting, and the shape, size and weight of the extruded embryo are consistent to form a qualified embryo; (2) The front end of the mold is equipped with a precision melt metering pump, which precisely controls the pressure before and after the pump, and automatically compensates the screw extrusion amount by the servo system to ensure uniform and constant extrusion.

 6, using dynamic underwater jet cooling constant technology

 The high-pressure system is used to spray the blasting primordial under water to meet different preforming conditions.

 The advantages of the dynamic underwater jet cooling constant technology (including the water self-circulation system in the tank) are as follows: (1) Using the jetted high-pressure water flow to drive the directional flow of the surface water of the primordial, timely removing the hot bubbles adsorbed on the surface of the primordial, and improving (1) Adjusting the water flow speed by the injection pressure to meet different specifications; (3) Recycling the water in the tank through the flow of water, eliminating the need for a circulation device and reducing costs.

 7, PLC program control technology

 Using the PLC program control system to realize direct dialogue between human and machine, automatic memory and selection of recipes, to avoid the influence of human factors.

 The advantages of the PLC program control technology are: (1) high degree of intelligence, automatic memory and storage of raw parameters; (2) precise and accurate control, avoiding human factors; (3) high cost performance, direct dialogue between human and machine, reducing 70% The labor intensity has increased the work efficiency by 1.5 times.

According to the kit and the process thereof described in the above embodiments, a packing tape made of thermoplastic polypropylene can be obtained, and the packing tape has a width of 5 mm to 19 mm, a thickness of 0.5 mm to 1.5 mm, and a tensile strength of more than 550 MPa. Small deviation, stable quality, good city Field prospects. The above is only a preferred embodiment of the present invention, and it should be noted that the above-described preferred embodiments are not to be construed as limiting the scope of the invention, and the scope of the invention should be defined by the scope of the claims. It will be apparent to those skilled in the art that various modifications and improvements can be made without departing from the spirit and scope of the invention.

Claims

Rights request

 A method for producing a strap, characterized in that it comprises the following steps:

(1) plasticizing and melting the packing material, and then extruding the strip blank having a certain thickness and width from the lip of the forming die;

 (2) Traction strap blanks are cooled and shaped and stretched once to meet the requirements of different specifications for packing blanks;

 (3) The slab of the packing belt after the traction cooling and setting is heated, and the second stretching is simultaneously performed at the preset stretching temperature, and the semi-finished belt of the packing belt is obtained after the stretching and deformation;

 (4) embossing on the surface of the strapping semi-finished strip;

 (5) After the embossing, the semi-finished tape of the strapping belt is heated and shaped, cooled and shaped, and completely removed into a finished strip of the strap after the stress is removed;

 (6) After the finished product of the strapping belt is metered, the winding is completed, and the final product of the strapping belt is obtained.

 2. The method of producing a packaging tape according to claim 1, wherein before the step (1), the polypropylene new material and the recycled material are mixed, and the auxiliary materials are added, and the respective materials are metered according to the formulation requirements, and the mixture is uniformly mixed. Get the packing tape material.

 3. The method of producing a baling tape according to claim 1, wherein in step (2), at 18. C~20. C water is cooled and shaped, and the water inlet angle and water inlet length are adjusted to meet the requirements of different specifications of the packaged blank.

 4. The method of producing a baling tape according to claim 1, wherein in step (2), the shaping is performed by dynamic underwater spraying to drive the flow of water on the surface of the primordial with a high-pressure water stream, and the surface of the blast is immediately removed. Hot bubbles improve the quality of the initial embryo.

 The method of producing a baling tape according to claim 1, wherein in the step (3), the heating is stretched by a self-circulating wind heat method, and the stretching temperature is kept constant at 110. C~130. C; and reciprocating winding method for heating, increasing the total length of the tensile heat-receiving line to more than 4 times the length of the tensile heat-receiving area.

The method for producing a packing belt according to claim 1, wherein in step (4), embossing is performed pneumatically, so that the multi-cylinder synchronous linkage mechanism and the embossing roller four-way adjusting device are automatically adjusted according to the tension. , compensate the embossing depth and adjust the horizontal and vertical bi-directional embossing position.

The method for producing a packaging tape according to claim 1, wherein in step (5), the shaping is performed by photothermal heating, and the reciprocating winding method is used for heating, and the total length of the shaped heating circuit is increased to a shaped heating region. More than 4 times the length.

 8. The method of producing a packaging tape according to claim 1, wherein in step (6), the automatic winding of the finished tape of the packaging tape is achieved by automatic control of the tension.

 The method for producing a strapping belt according to any one of claims 1 to 8, wherein in each step, the traction is performed by a synchronous flexible linkage method, and the traction linear velocity is up to 280 m/min.

 10. A packaged complete set of equipment, comprising: a strong extruder, a cooling water tank, a first traction unit, a stretching oven, a second traction unit, an embossing unit, a shaping oven, a shaping water tank, a third traction unit And the tape winding machine, the above-mentioned various devices are arranged in order to realize continuous processing of the package blank from the strip material melted from the strap material to the finished tape winding of the strap.