CN114905715A - Preparation process and intelligent production equipment of biaxially oriented polypropylene dual-heat green protection film - Google Patents
Preparation process and intelligent production equipment of biaxially oriented polypropylene dual-heat green protection film Download PDFInfo
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- CN114905715A CN114905715A CN202210130436.7A CN202210130436A CN114905715A CN 114905715 A CN114905715 A CN 114905715A CN 202210130436 A CN202210130436 A CN 202210130436A CN 114905715 A CN114905715 A CN 114905715A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/001—Combinations of extrusion moulding with other shaping operations
- B29C48/0018—Combinations of extrusion moulding with other shaping operations combined with shaping by orienting, stretching or shrinking, e.g. film blowing
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/022—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the choice of material
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
- B29C48/07—Flat, e.g. panels
- B29C48/08—Flat, e.g. panels flexible, e.g. films
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/16—Articles comprising two or more components, e.g. co-extruded layers
- B29C48/18—Articles comprising two or more components, e.g. co-extruded layers the components being layers
- B29C48/21—Articles comprising two or more components, e.g. co-extruded layers the components being layers the layers being joined at their surfaces
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/25—Component parts, details or accessories; Auxiliary operations
- B29C48/28—Storing of extruded material, e.g. by winding up or stacking
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29K2023/00—Use of polyalkenes or derivatives thereof as moulding material
- B29K2023/10—Polymers of propylene
- B29K2023/12—PP, i.e. polypropylene
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- Mechanical Engineering (AREA)
- Laminated Bodies (AREA)
- Shaping By String And By Release Of Stress In Plastics And The Like (AREA)
Abstract
The invention discloses a preparation process of a biaxially oriented polypropylene dual-heat green protection film and intelligent production equipment thereof, wherein the film sequentially comprises an upper surface layer, a last surface layer, a core layer, a next surface layer and a lower surface layer, wherein the core layer is a main extrusion layer, homo-polypropylene 90-95% and a stiffness increasing agent 5-10% are selected, the last surface layer is a color master layer, and homo-polymer green color master batch 100% is selected; 100% of homopolymerized polypropylene is selected as the next surface layer; the upper surface layer and the lower surface layer are heat sealing layers, and 94% -98% of copolymerized polypropylene and 2% -6% of anti-sticking agent are mixed. In the process that the polypropylene double-heat green protection film raw material moves from one side of the material conveying roller to one side close to the winding device, the width of the polypropylene double-heat green protection film is gradually widened by the two pairs of transverse stretching rollers, and the two pairs of transverse stretching rollers are smooth in surface and can be always clamped with the two sides of the polypropylene double-heat green protection film raw material.
Description
Technical Field
The invention relates to the technical field of BOPP protective films, in particular to a preparation process and intelligent production equipment of a biaxially oriented polypropylene dual-heat green protective film.
Background
Be applied to BOPP protection film that electron device process was wasted discharge, current production technology is that it has the glue of colour to coat a layer on ordinary light membrane, form the film of wasting discharge, can play both to protect electron device and can discern categorised effect through the colour is quick, but at the gluey glue of coating on the light membrane coloured, the process is many, the rubber coating cost is high, and there is the colour shortcoming of easy fading and decoloration, not only can not keep electron device's cleanliness factor still can cause the pollution, so the coloured protection film of BOPP of urgent need in the market.
Meanwhile, in the current process of producing the polypropylene dual-heat green protection film, the edges of the polypropylene dual-heat green protection film are usually clamped by a plurality of groups of fixing clamps, and then the polypropylene dual-heat green protection film is synchronously stretched, however, the stretching method of the base film can cause the stretching unevenness of the polypropylene dual-heat green protection film, and the polypropylene dual-heat green protection film cannot be continuously stretched in multiple directions; in addition, after the raw material of the current polypropylene double-heat green protection film is extruded from the extruder, an operator is required to manually flatten the molten raw material of the polypropylene double-heat green protection film and sequentially pass through a plurality of groups of stretching guide rollers, so that the process is very time-delayed, and the raw material of the polypropylene double-heat green protection film cannot automatically pass through the plurality of groups of guide rollers, so that the use convenience of the manufacturing equipment is reduced; simultaneously current two hot green protection film manufacture equipment of polypropylene often can't switch the good two hot green protection film of polypropylene of rolling fast when two hot green protection film rolling of polypropylene to whole base film manufacture equipment's practicality has been reduced.
Disclosure of Invention
The invention aims to provide a preparation process of a biaxially oriented polypropylene dual-thermal green protection film and intelligent production equipment thereof, so as to solve the related problems in the background technology.
In order to achieve the purpose, the invention provides the following technical scheme: a preparation process of a biaxially oriented polypropylene dual-heat green protection film comprises the following steps:
s1, blending the raw materials: the film sequentially comprises an upper surface layer, a last surface layer, a core layer, a next surface layer and a lower surface layer, wherein the core layer is a main extrusion layer, 90-95% of homo-polypropylene and 5-10% of a stiffness increasing agent are selected, the last surface layer is a color master layer, and 100% of homo-green color master batch is selected; 100% of homopolymerized polypropylene is selected as the next surface layer; the upper surface layer and the lower surface layer are heat sealing layers, and 94% -98% of polypropylene copolymer and 2% -6% of anti-sticking agent are mixed;
s2, extrusion molding: respectively adding the raw materials of the upper surface layer, the core layer, the lower surface layer and the lower surface layer into respective extruders, and co-extruding and compounding to form a casting sheet with the thickness of 2.5-4.0 mm;
s3, stretching and shaping: firstly, transversely preheating the cast sheet formed in S2, transversely stretching, shaping, longitudinally preheating, longitudinally lifting by a longitudinally lifting structure, shaping, cooling, and winding
Preferably, after the core layer raw material enters the twin-screw extruder in the step 2, after the excess air needs to be removed during raw material plasticization, secondary plasticization, metering and filtration are carried out, and the temperature is set to be 230-250 ℃; extruding and filtering the raw materials of each surface layer by a single-screw extruder and a double-screw extruder, setting the temperature of the upper and lower surface layers at 220-240 ℃, setting the temperature of the upper and lower surface layers at 225-250 ℃, and finally extruding the five layers of raw materials from a die head through corresponding connecting pipes
Preferably, the die temperature in step 3 is set to 225-235 ℃, the chill roll temperature is set to 25-32 ℃, and the cooling water pool temperature is 25-38 ℃. In the longitudinal stretching process, the temperature of the preheating zone is 116-.
Preferably: the middle position of the top of the installation table is provided with a bottom bin, the middle positions of two ends in the bottom bin are symmetrically provided with electric hydraulic cylinders, two groups of output ends of the electric hydraulic cylinders are jointly provided with a top bin, two ends in the top bin and the bottom bin are symmetrically provided with transverse stretching rollers, two ends of each transverse stretching roller are symmetrically provided with universal joints, two ends of two sides in the top bin and the bottom bin are symmetrically provided with rotating shafts, eight groups of rotating shafts are fixedly connected with one adjacent group of universal joints respectively, one ends of the outer sides of the four groups of rotating shafts at the same end are provided with second transmission gears, the outer sides of the two groups of rotating shafts close to one ends of the second transmission gears are symmetrically provided with second bevel gears, each second bevel gear comprises a third driving motor, a second chain wheel and a second chain, and the middle position of the bottom of the installation table is provided with a third driving motor, and the middle positions of the outer sides of the third driving motor and the guide roller are both provided with a second chain wheel, the outer sides of the second chain wheels are jointly provided with a second chain, the middle position of the top in the top bin is provided with an electric heating plate, one sides of the top bin and the bottom bin close to the second transmission gear are jointly provided with a longitudinal stretching component, the middle position of one side of the top of the mounting table is uniformly provided with a material conveying roller, one end of the outer side of the material conveying roller is jointly provided with a third transmission component, one side of the top of the mounting table close to the material conveying roller is provided with a protection bin, the material conveying roller is positioned in the protection bin, the middle position of the inner part of the bottom bin is provided with a trapezoidal bin, the inner part of the trapezoidal bin is uniformly provided with the guide roller, the bottom of the mounting table is provided with a second conical gear in transmission connection with the guide roller, one side of the top of the mounting table far away from the material conveying roller is provided with a winding device, and a control panel is installed at one end of the winding device frame body and is respectively electrically connected with the electric heating plate and the electric hydraulic cylinder through leads.
Preferably, the longitudinal stretching assembly comprises a first transmission assembly, a first driving motor, squeezing rollers, flattening rollers, U-shaped frames, first bevel gears and annular cutters, the U-shaped frames are symmetrically arranged on one sides of the top bin and the bottom bin far away from the material conveying roller, the flattening rollers are symmetrically arranged at the middle positions of the inner sides of the two groups of U-shaped frames, the squeezing rollers are arranged on one sides of the inner parts of the U-shaped frames far away from the top bin, the annular cutters are symmetrically arranged at two ends of the outer sides of the flattening rollers at one group of the bottom, the first bevel gears meshed with the second bevel gears are symmetrically arranged at two ends of the outer sides of the group of flattening rollers, the first driving motor connected with the flattening rollers in a transmission manner is arranged at one end of the U-shaped frame at the group of the bottom, the first transmission assembly connected with one end of one group of the squeezing rollers in a transmission manner is arranged at the output end of the first driving motor, one end of the squeezing rollers far away from the first driving motor is connected with the universal joint in a transmission manner through an electric heating plate, the control panel is electrically connected with the first driving motor through a lead.
Preferably, the coiling mechanism includes servo motor, wind-up roll, carousel, driven gear, mounting bracket, driving gear and second drive assembly, the mounting bracket is installed to one side that defeated material roller was kept away from at the mount table top, and the intermediate position department symmetry of both sides is provided with the carousel in the mounting bracket, and is two sets of the inboard non-centre of a circle of carousel position department evenly is provided with four group's wind-up rolls, and is a set of servo motor that is connected with adjacent a set of carousel transmission, four groups servo motor's one end is all installed with universal joint intermeshing's driven gear to the one end that servo motor was kept away from to the wind-up roll, the inboard non-centre of a circle position department of mounting bracket is provided with the driving gear with driven gear mutually supported, the one end in the driving gear pivot outside is provided with second drive assembly, control panel passes through the wire and is connected with the servo motor electricity.
Preferably, the mount table top is close to one side of defeated material roller and installs the blowing storehouse, and the blowing storehouse is located the top of defeated material roller, the inside bilateral symmetry of blowing storehouse is provided with the crowded material roller of mutually supporting, and is two sets of crowded material roller passes the blowing storehouse and installs intermeshing's third drive gear with one end, the second driving motor who is connected with a set of crowded material roller transmission is installed to the one end that third drive gear was kept away from to the blowing storehouse, intermeshing's first drive gear is installed with one end to second driving motor's output and a set of defeated material roller.
Preferably, first drive assembly includes first belt pulley and first drive belt, and is a set of first belt pulley is all installed to the one end of squeeze roll and first driving motor's output, and the outside of two sets of first belt pulleys is provided with first drive belt jointly.
Preferably, the second transmission assembly comprises a second belt pulley and a second transmission belt, the second belt pulley is installed at one end of the group of squeezing rollers and one end of the rotating shaft of the driving gear, and the second transmission belt is arranged on the outer sides of the two groups of second belt pulleys together.
Preferably, the third transmission assembly comprises a first chain wheel and a first chain, the same end of the twelve groups of conveying rollers is provided with the chain wheel, and the outer sides of the twelve groups of chain wheels are provided with the chain together.
Compared with the prior art, the invention provides a preparation process and intelligent production equipment of a biaxially oriented polypropylene dual-heat green protection film, and the preparation process and the intelligent production equipment have the following beneficial effects:
1. the invention discloses a multilayer co-extrusion manufacturing process formula and a production process of the double-heat green protective film, meets the market demand, reduces the manufacturing process and the gluing cost compared with the existing process of manufacturing the waste film by coating colored glue on a common optical film, and does not fade the color.
2. When the raw material of the polypropylene double-heat green protection film needs to be stretched, the two pairs of transverse stretching rollers respectively clamp two ends of the raw material of the polypropylene double-heat green protection film, and the two pairs of transverse stretching rollers rotate oppositely, in the process that the raw material of the polypropylene double-heat green protection film moves from one side of a material conveying roller to one side close to a winding device, the width of the polypropylene double-heat green protection film is gradually widened by the two pairs of transverse stretching rollers, and because the surfaces of the two pairs of transverse stretching rollers are smooth and can be always clamped with two sides of the raw material of the polypropylene double-heat green protection film, the condition that the polypropylene double-heat green protection film is stretched unevenly due to gaps between clamps is avoided, the condition that the edge position of the polypropylene double-heat green protection film is fluctuated and uneven is avoided, after the polypropylene double-heat green protection film is transversely stretched, through the cooperation of the two groups of flattening rollers and the annular cutter, the polypropylene double-heat green protection film can be automatically flattened, redundant parts on two sides of the polypropylene double-heat green protection film can be automatically cut off, and then the polypropylene double-heat green protection film is automatically longitudinally stretched by utilizing the rotating speed difference between the extrusion roller and the flattening roller, so that the thickness and the width of the polypropylene double-heat green protection film can reach the standard, the polypropylene double-heat green protection film can be continuously processed and produced, and the production efficiency of the polypropylene double-heat green protection film is improved.
3. After the raw material of the melted polypropylene double-heat green protection film falls on a plurality of groups of material conveying rollers, two groups of electric hydraulic cylinders are controlled to extend to separate a top bin from a bottom bin, namely two pairs of transverse stretching rollers are separated, and two groups of extrusion rollers and flattening rollers are separated from each other, at the moment, the plurality of groups of material conveying rollers can automatically convey the raw material of the melted polypropylene double-heat green protection film to the inside of the bottom bin, and when the raw material of the polypropylene double-heat green protection film passes through the guide rollers, a second conical gear is controlled to drive a plurality of groups of guide rollers in the trapezoidal bin to synchronously rotate in the same direction, so that the raw material of the melted polypropylene double-heat green protection film is automatically moved continuously towards a winding device until the head end of the raw material of the polypropylene double-heat green protection film gradually passes through the extrusion rollers and the flattening rollers at the bottom, and thus an operator can conveniently fix the head end of the polypropylene double-heat green protection film on the winding rollers, in the process, an operator does not need to manually alternate the polypropylene double-heat green protection film among the guide rollers, so that the using steps of the whole polypropylene double-heat green protection film manufacturing equipment are simplified, and the manufacturing equipment is more practical.
4. When the produced polypropylene double-hot green protection film is rolled, the head end of the polypropylene double-hot green protection film is fixed on a group of rolling rollers farthest from an installation platform, then a squeeze roller drives a driving gear to rotate through a second transmission component, the driving gear drives a corresponding rolling roller to rotate through a group of driven gears connected with each other, so that the polypropylene double-hot green protection film is rolled, the polypropylene double-hot green protection film passes through the outer side of a second group of rolling rollers at the top before being rolled by the first group of rolling rollers, after the first group of rolling rollers are fully rolled with the polypropylene double-hot green protection film, a servo motor is controlled to rotate anticlockwise for 45 degrees, the driven gear on the first group of rolling rollers is not meshed with the driving gear any more, then the polypropylene double-hot green protection film is manually cut off, and then the head end of the cut polypropylene double-hot green protection film is immediately fixed on the outer side of the second group of rolling rollers, then control servo motor drives the carousel anticlockwise rotation 45, let the driven gear and the driving gear meshing of the wind-up roll one end of second group to drive the wind-up roll of second group and begin the two hot green protection film of rolling polypropylene, realize the fast switch-over of wind-up roll, and at this in-process, need not stop vertical tensile subassembly and coiling mechanism to the multidirectional tensile of two hot green protection film raw materials of polypropylene, just also can further improve the production efficiency of two hot green protection film of polypropylene.
Drawings
FIG. 1 is a top view of the present invention;
FIG. 2 is a top view of the take-up device and top bin of the present invention shown disassembled;
FIG. 3 is a top cross-sectional view of the winding device of the present invention after being disassembled;
FIG. 4 is a side view of the present invention;
FIG. 5 is a bottom view of the top bin of the present invention;
FIG. 6 is a schematic perspective view of the bottom bin of the present invention;
FIG. 7 is an enlarged view taken at A of FIG. 3 according to the present invention;
fig. 8 is an enlarged view of fig. 3 at B according to the present invention.
In the figure: 1. an installation table; 2. jacking a bin; 3. a longitudinal stretching assembly; 301. a first transmission assembly; 302. a first drive motor; 303. a squeeze roll; 304. flattening rollers; 305. a U-shaped frame; 306. a first bevel gear; 307. a ring-shaped cutter; 4. a control panel; 5. a winding device; 501. a servo motor; 502. a wind-up roll; 503. a turntable; 504. a driven gear; 505. a mounting frame; 506. a driving gear; 507. a second transmission assembly; 6. a third transmission gear; 7. an electrical heating plate; 8. a protection bin; 9. a third transmission assembly; 10. a discharge bin; 11. a material extruding roller; 12. a delivery roller; 13. a second drive motor; 14. a universal joint; 15. a first drive gear; 16. a trapezoidal bin; 17. an electric hydraulic cylinder; 18. a second transmission gear; 19. a second bevel gear; 20. a rotating shaft; 21. a guide roller; 22. a bottom bin; 23. and (5) transversely stretching the roller.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1-8, the present invention provides a technical solution: a preparation process of a biaxially oriented polypropylene dual-heat green protection film comprises the following steps:
s1, blending the raw materials: the film sequentially comprises an upper surface layer, a last surface layer, a core layer, a next surface layer and a lower surface layer, wherein the core layer is a main extrusion layer, 90-95% of homo-polypropylene and 5-10% of a stiffness increasing agent are selected, the last surface layer is a color master layer, and 100% of homo-green color master batch is selected; 100% of homopolymerized polypropylene is selected as the next surface layer; the upper surface layer and the lower surface layer are heat sealing layers, and 94% -98% of polypropylene copolymer and 2% -6% of anti-sticking agent are mixed;
s2, extrusion molding: respectively adding the raw materials of the upper surface layer, the core layer, the lower surface layer and the lower surface layer into respective extruders, and co-extruding and compounding to form a casting sheet with the thickness of 2.5-4.0 mm;
s3, stretching and shaping: firstly, transversely preheating the cast sheet formed in S2, transversely stretching, shaping, longitudinally preheating, longitudinally lifting by a longitudinally lifting structure, shaping, cooling, and winding
Further, in the step 2, after the core layer raw material enters the twin-screw extruder, after the excess air needs to be removed during raw material plasticization, secondary plasticization, metering and filtration are carried out, and the temperature is set to be 230-250 ℃; extruding and filtering raw materials of each surface layer by a single screw and double screw extruder, setting the temperature of the upper and lower surface layers at 220-240 deg.C and the temperature of the upper and lower surface layers at 225-250 deg.C, and extruding the five layers of raw materials from a die head through corresponding connecting pipes
Further, the temperature of the mold head in the step 3 is set to 225-235 ℃, the temperature of the chill roll is set to 25-32 ℃, and the temperature of the cooling water pool is 25-38 ℃. In the longitudinal stretching process, the temperature of the preheating zone is 116-.
Further, intelligent manufacture equipment that polypropylene double-heat green protection film manufacturing process used based on multidirectional stretching includes mount table 1, its characterized in that: a bottom bin 22 is arranged in the middle of the top of the mounting table 1, electric hydraulic cylinders 17 are symmetrically arranged in the middle of two ends of the bottom bin 22, a top bin 2 is arranged at the output ends of the two groups of electric hydraulic cylinders 17, transverse stretching rollers 23 are symmetrically arranged at two ends of the interior of the top bin 2 and the interior of the bottom bin 22, universal joints 14 are symmetrically arranged at two ends of the transverse stretching rollers 23, rotating shafts 20 are symmetrically arranged at two ends of two sides of the interior of the top bin 2 and the interior of the bottom bin 22, one end of each of eight groups of rotating shafts 20 is fixedly connected with the adjacent group of universal joints 14, a second transmission gear 18 is arranged at one end of the outer side of each of four groups of rotating shafts 20 at the same end, second bevel gears 19 are symmetrically arranged at the outer sides of the two groups of rotating shafts 20 at one end close to the second transmission gears 18, each second bevel gear 19 comprises a third driving motor, a second chain wheel and a second chain, a third driving motor is arranged in the middle of the bottom of the mounting table 1, a second chain wheel is arranged at the middle position of the outer sides of the third driving motor and the guide rollers 21, a second chain is arranged at the outer side of the second chain wheel together, which is helpful for driving all the guide rollers 21 to synchronously rotate in the same direction, an electric heating plate 7 is arranged at the middle position of the top in the top bin 2, a longitudinal stretching component 3 is arranged at one side of the top bin 2 and the bottom bin 22 close to the second transmission gear 18 together, a material conveying roller 12 is uniformly arranged at the middle position of one side of the top of the mounting table 1, a third transmission component 9 is arranged at one end of the outer side of the material conveying roller 12 together, a protection bin 8 is arranged at one side of the top of the mounting table 1 close to the material conveying roller 12, the material conveying roller 12 is positioned in the protection bin 8 to prevent external dust from falling onto the polypropylene double-heating green protection film raw material, a trapezoidal bin 16 is arranged at the middle position of the inner part of the bottom bin 22, and the guide rollers 21 are uniformly arranged in the trapezoidal bin 16, the bottom of mount table 1 is provided with second bevel gear 19 with guide roll 21 transmission connection, and one side of 1 top of mount table keeping away from defeated material roller 12 is provided with coiling mechanism 5, and the one end of coiling mechanism 5 support body installs control panel 4, and control panel 4 passes through the wire and is connected with electric heating board 7 and electric hydraulic cylinder 17 electricity respectively.
Further, the longitudinal stretching assembly 3 comprises a first transmission assembly 301, a first driving motor 302, squeeze rollers 303, leveling rollers 304, U-shaped frames 305, first bevel gears 306 and annular cutters 307, the U-shaped frames 305 are symmetrically arranged on one sides of the top bin 2 and the bottom bin 22 far away from the delivery roll 12, the leveling rollers 304 are symmetrically arranged at the middle positions of the inner sides of the two groups of U-shaped frames 305, the squeeze rollers 303 are arranged on one side of the inner side of the U-shaped frames 305 far away from the top bin 2, the annular cutters 307 are symmetrically arranged at two ends of the outer side of the group of leveling rollers 304, the first bevel gears 306 meshed with the second bevel gears 19 are symmetrically arranged at two ends of the outer side of the group of leveling rollers 304, the first driving motor 302 in transmission connection with the leveling rollers 304 is arranged at one end of the group of U-shaped frames 305 at the bottom, the first transmission assembly 301 in transmission connection with one end of the group of squeeze rollers 303 is arranged at the output end of the first driving motor 302, one end of the group of squeezing rollers 303 far away from the first driving motor 302 is in transmission connection with the universal joint 14 through the electric heating plate 7, and the control panel 4 is electrically connected with the first driving motor 302 through a lead.
Further, the winding device 5 comprises a servo motor 501, a winding roller 502, a turntable 503, a driven gear 504, a mounting rack 505, a driving gear 506 and a second transmission assembly 507, the mounting rack 505 is mounted on one side of the top of the mounting table 1 far away from the material conveying roller 12, the middle positions of two sides in the mounting frame 505 are symmetrically provided with rotating discs 503, four groups of winding rollers 502 are uniformly arranged at non-circle center positions on the inner sides of the two groups of rotating discs 503, one end of one group of mounting frame 505 is provided with a servo motor 501 in transmission connection with the adjacent group of rotating discs 503, one ends of the four groups of winding rollers 502 far away from the servo motor 501 are provided with driven gears 504 which are meshed with the universal joints 14, a driving gear 506 which is matched with the driven gears 504 is arranged at the non-circle center position on the inner side of the mounting frame 505, one end of the outer side of the rotating shaft of the driving gear 506 is provided with a second transmission assembly 507, and the control panel 4 is electrically connected with the servo motor 501 through a conducting wire.
Further, a discharge bin 10 is installed at one side, close to a material conveying roller 12, of the top of the mounting table 1, the discharge bin 10 is located above the material conveying roller 12, extruding rollers 11 matched with each other are symmetrically arranged on two sides inside the discharge bin 10, the same end of each of two groups of extruding rollers 11 penetrates through the discharge bin 10 and is provided with a third transmission gear 6 meshed with each other, a second driving motor 13 connected with the corresponding group of extruding rollers 11 in a transmission mode is installed at one end, far away from the third transmission gear 6, of the discharge bin 10, and a first transmission gear 15 meshed with each other is installed at the output end of the second driving motor 13 and the same end of the corresponding group of material conveying roller 12.
Further, the first transmission assembly 301 includes a first belt pulley and a first transmission belt, the first belt pulley is installed at one end of the group of squeeze rollers 303 and the output end of the first driving motor 302, and the first transmission belt is jointly disposed on the outer sides of the two groups of first belt pulleys, which helps to drive the squeeze rollers 303 to rotate stably.
Further, the second transmission assembly 507 includes a second belt pulley and a second transmission belt, the second belt pulley is installed at one end of the group of squeezing rollers 303 and one end of the rotating shaft of the driving gear 506, and the second transmission belt is jointly arranged at the outer sides of the two groups of second belt pulleys, which is helpful for driving the squeezing rollers 303 to rotate stably.
Further, the third transmission assembly 9 includes a first chain wheel and a first chain, the same ends of the twelve groups of material conveying rollers 12 are all provided with chain wheels, and the outer sides of the twelve groups of chain wheels are provided with chains together, which is helpful for driving all the material conveying rollers 12 to synchronously rotate in the same direction.
Example 1, as shown in fig. 1-8, a control panel 4 controls a second driving motor 13 to drive two sets of extrusion rollers 11 to rotate in opposite directions, so as to clamp the molten polypropylene dual-hot green protection film raw material into a flat shape and fall onto a plurality of sets of material delivery rollers 12, the second driving motor 13 can drive the plurality of sets of material delivery rollers 12 to rotate synchronously and in the same direction through the transmission of a first transmission gear 15 and a third transmission assembly 9, so as to gradually convey the molten polypropylene dual-hot green protection film raw material in a direction close to a mounting frame 505, so that the polypropylene dual-hot green protection film raw material is gradually conveyed onto a plurality of sets of guide rollers 21, at this time, the third driving motor is controlled to cooperate with a second sprocket and a second chain to drive a plurality of sets of guide rollers 21 to rotate synchronously and in the same direction, so as to automatically move the molten polypropylene dual-hot green protection film raw material continuously in a direction of a winding device 5, until the head end of the polypropylene dual-hot green protection film raw material gradually passes through a bottom set of extrusion rollers 303 and a flattening roller 304, the operator then secures the head end of the polypropylene double-heated green protective film to the first set of wind-up rolls 502 furthest from the mounting station 1, thus completing the preparation of the device prior to processing.
Example 2, as shown in fig. 1-8, after the preparation before the use of the apparatus is completed, two sets of electric hydraulic cylinders 17 are controlled to shorten, so that the top bin 2 and the bottom bin 22 are attached again, and the ends of the outer sides of two pairs of transverse stretching rollers 23 close to the delivery rollers 12 also clamp the two sides of the polypropylene double-hot green protective film raw material, and then the production of the polypropylene double-hot green protective film is started, the electric heating plate 7 is controlled to bake and heat the upper side of the guide rollers 21 stably, so that the polypropylene double-hot green protective film raw material above the guide rollers 21 is more easily stretched, the flat polypropylene double-hot green protective film is delivered to a plurality of sets of guide rollers 21 by the plurality of sets of delivery rollers 12, at this time, the first driving motor 302 is controlled to drive the flattening roller 304 to rotate clockwise, the transverse stretching rollers 23 at the two ends inside the bottom bin 22 are rotated oppositely through the transmission of the first bevel gear 306 and the second bevel gear 19, the two groups of transverse stretching rollers 23 at the bottom drive the two groups of transverse stretching rollers 23 at the two ends inside the top bin 2 to rotate through the transmission of the second transmission gear 18, the top bin 2 and the bottom bin 22 jointly form a cavity, the two pairs of transverse stretching rollers 23 at the two ends in the cavity can transversely stretch the clamped polypropylene double-heat green protection film raw material while rotating in opposite directions, the winding device 5 can pull the polypropylene double-heat green protection film to move, the polypropylene double-heat green protection film raw material can be transversely widened by the two pairs of transverse stretching rollers 23 in the process of gradually moving towards the direction close to the winding device 5, and then when the polypropylene double-heat green protection film passes through the two groups of flattening rollers 304, the annular cutters 307 at the two ends outside the flattening rollers 304 can cut off the redundant parts at the two sides of the polypropylene double-heat green protection film, and the speed of the first driving motor 302 matched with the first transmission component 301 to drive the extrusion rollers 303 to rotate is higher than that of the flattening rollers 304, thus, longitudinal pulling force is generated on the polypropylene double-heating green protection film between the squeezing roller 303 and the flattening roller 304, and longitudinal stretching of the polypropylene double-heating green protection film is realized.
Embodiment 3, as shown in fig. 1 to 8, when winding the produced polypropylene dual-heat green protection film, the head end of the polypropylene dual-heat green protection film is fixed on a first set of winding rollers 502 farthest from the mounting table 1, then the extrusion roller 303 drives the driving gear 506 to rotate through the second transmission assembly 507, and the driving gear 506 drives the corresponding winding roller 502 to rotate through the connected set of driven gears 504, so as to wind the polypropylene dual-heat green protection film, and before the polypropylene dual-heat green protection film is wound by the first set of winding rollers 502, the polypropylene dual-heat green protection film passes through the outside of the second set of winding rollers 502 at the top, after the first set of winding rollers 502 is fully wound with the polypropylene dual-heat green protection film, the servo motor 501 is controlled to rotate 45 degrees counterclockwise, so that the driven gears 504 on the first set of winding rollers 502 are not engaged with the driving gear 506 any more, then the polypropylene double-heat green protection film is manually cut off, the head end of the cut polypropylene double-heat green protection film is immediately fixed to the outer side of the second group of winding rollers 502, then the servo motor 501 is controlled to drive the turntable 503 to rotate 45 degrees anticlockwise, the driven gear 504 at one end of the second group of winding rollers 502 is meshed with the driving gear 506, the second group of winding rollers 502 is driven to start winding the polypropylene double-heat green protection film, and by analogy, the quick switching of the winding rollers 502 can be realized, and in the quick switching process of the winding rollers 502, the whole polypropylene double-heat green protection film manufacturing device can still perform multidirectional stretching processing on the polypropylene double-heat green protection film raw material.
The working principle is as follows: before the device is used, one side of the whole manufacturing device with the discharging bin 10 is moved to the position below an outlet of an extruder, the top of the discharging bin 10 is positioned right below the outlet of the extruder, then the extruder is controlled to discharge the raw material of the molten polypropylene double-heat green protection film into the discharging bin 10, then a control panel 4 controls a second driving motor 13 to drive two groups of extruding rollers 11 to rotate oppositely, the raw material of the molten polypropylene double-heat green protection film is clamped into a flat shape and falls onto a plurality of groups of material conveying rollers 12, the second driving motor 13 can drive the plurality of groups of material conveying rollers 12 to rotate synchronously and in the same direction through the transmission of a first transmission gear 15 and a third transmission assembly 9, so that the raw material of the molten polypropylene double-heat green protection film is conveyed towards the direction close to the mounting frame 505 gradually, meanwhile, two groups of electric hydraulic cylinders 17 are controlled to extend to separate a top bin 2 from a bottom bin 22, then the two pairs of transverse stretching rollers 23 are separated, and the two groups of squeeze rollers 303 and the flattening rollers 304 are separated from each other, at this time, the multiple groups of feed delivery rollers 12 automatically convey the molten polypropylene double-heat green protection film raw material to the inside of the bottom bin 22, and when the polypropylene double-heat green protection film raw material passes through the guide rollers 21, the second bevel gear 19 is controlled to drive the multiple groups of guide rollers 21 inside the trapezoidal bin 16 to synchronously and synchronously rotate in the same direction, so that the molten polypropylene double-heat green protection film raw material is automatically continuously moved towards the winding device 5 until the head end of the polypropylene double-heat green protection film raw material gradually passes through the bottom group of squeeze rollers 303 and the flattening rollers 304, then an operator fixes the head end of the polypropylene double-heat green protection film on the first group of winding rollers 502 farthest from the installation platform 1, and then controls the two groups of electric hydraulic cylinders 17 to shorten, so that the top bin 2 and the bottom bin 22 are attached again, one ends of the outer sides of the two pairs of transverse stretching rollers 23 close to the material conveying rollers 12 also clamp two sides of the polypropylene double-heat green protection film raw material;
when the polypropylene double-heat green protection film is manufactured, firstly, the electric heating plate 7 is controlled to stably bake and heat the upper part of the guide roller 21, so that the polypropylene double-heat green protection film raw material above the guide roller 21 is more easily stretched, the flat polypropylene double-heat green protection film is conveyed onto the plurality of groups of guide rollers 21 by the plurality of groups of conveying rollers 12, at the moment, the first driving motor 302 is controlled to drive the flattening rollers 304 to rotate clockwise, the transverse stretching rollers 23 at the two ends inside the bottom bin 22 rotate oppositely through the transmission of the first conical gear 306 and the second conical gear 19, the two groups of transverse stretching rollers 23 at the bottom bin 2 drive the two groups of transverse stretching rollers 23 at the two ends inside the top bin 2 to rotate through the transmission of the second transmission gear 18, the top bin 2 and the bottom bin 22 jointly form a cavity, the two pairs of transverse stretching rollers 23 at the two ends in the cavity can also transversely stretch the clamped polypropylene double-heat green protection film raw material while rotating oppositely, and the winding device 5 also pulls the polypropylene double-heat green protection film to move, when the polypropylene double-heat green protection film raw material gradually moves towards the direction close to the winding device 5, the polypropylene double-heat green protection film is transversely stretched by the two pairs of transverse stretching rollers 23, then when the polypropylene double-heat green protection film passes through the two groups of flattening rollers 304, the annular cutters 307 at the two outer ends of the flattening rollers 304 can cut off the redundant parts at the two sides of the polypropylene double-heat green protection film, and because the first driving motor 302 is matched with the first driving component 301 to drive the extrusion roller 303 to rotate at a speed higher than that of the flattening rollers 304, the longitudinal pulling force can be generated on the polypropylene double-heat green protection film between the extrusion roller 303 and the flattening rollers 304, the longitudinal stretching of the polypropylene double-heat green protection film is realized, when the produced polypropylene double-heat green protection film is wound, the head end of the polypropylene double-heat green protection film is fixed on a group of winding rollers 502 which is farthest from the mounting table 1, then the extrusion roller 303 drives the driving gear 506 to rotate through the second transmission assembly 507, the driving gear 506 drives the corresponding winding roller 502 to rotate through the connected group of driven gears 504, thereby winding the polypropylene double-heat green protection film, the polypropylene double-heat green protection film passes through the outer side of the second group of winding rollers 502 on the top before being wound by the first group of winding rollers 502, after the polypropylene double-heat green protection film is fully wound by the first group of winding rollers 502, only the servo motor 501 needs to be controlled to rotate 45 degrees anticlockwise, the driven gears 504 on the first group of winding rollers 502 are not meshed with the driving gear 506, then the polypropylene double-heat green protection film is manually cut off, the head end of the cut polypropylene double-heat green protection film is immediately fixed to the outer side of the second group of winding rollers 502, then the servo motor 501 is controlled to drive the turntable 503 to rotate 45 degrees anticlockwise, let driven gear 504 and the driving gear 506 meshing of second group wind-up roll 502 one end to drive second group wind-up roll 502 and begin the two hot green protective film of coiling polypropylene, realize the fast switch-over of wind-up roll.
It should be noted that, in this document, relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
The electrical components presented in the document are all electrically connected with an external master controller and 220V mains, and the master controller can be a conventional known device controlled by a computer or the like.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (10)
1. A preparation process of a biaxially oriented polypropylene dual-heat green protection film is characterized by comprising the following steps:
s1, blending the raw materials: the film sequentially comprises an upper surface layer, a last surface layer, a core layer, a next surface layer and a lower surface layer, wherein the core layer is a main extrusion layer, 90-95% of homo-polypropylene and 5-10% of a stiffness increasing agent are selected, the last surface layer is a color master layer, and 100% of homo-green color master batch is selected; 100% of homopolymerized polypropylene is selected as the next surface layer; the upper surface layer and the lower surface layer are heat sealing layers, and 94% -98% of polypropylene copolymer and 2% -6% of anti-sticking agent are mixed;
s2, extrusion molding: respectively adding the raw materials of the upper surface layer, the core layer, the lower surface layer and the lower surface layer into respective extruders, and co-extruding and compounding to form a casting sheet with the thickness of 2.5-4.0 mm;
s3, stretching and shaping: firstly, transversely preheating the cast sheet formed in the step S2, then transversely stretching, finally shaping, then longitudinally preheating, then longitudinally lifting through a longitudinal lifting structure, shaping, cooling and finally winding.
2. The process of claim 1, wherein in step 2, after the core layer raw material enters the twin-screw extruder and the excess air is removed during raw material plasticization, the core layer raw material is subjected to secondary plasticization, metering and filtration at a temperature of 230-250 ℃; extruding and filtering raw materials of each surface layer by a single-screw extruder and a double-screw extruder, setting the temperature of the upper surface layer and the lower surface layer at 220-240 ℃, setting the temperature of the upper surface layer and the lower surface layer at 225-250 ℃, and finally extruding the five layers of raw materials from a die head through corresponding connecting pipes.
3. The process as claimed in claim 1, wherein the temperature of the mold head in step 3 is set to 225-235 ℃, the temperature of the chill roll is set to 25-32 ℃, the temperature of the cooling water pool is 25-38 ℃, the temperature of the preheating zone is 116-130 ℃, the temperature of the stretching roll is 105-112 ℃, the stretching ratio is 4.6-4.85 times, the temperature of the sizing roll is 110-130 ℃, the temperature of the preheating zone is 170-176 ℃, the temperature of the stretching zone is 150-156 ℃, the temperature of the sizing zone is 155-165 ℃, the temperature of the cooling zone is indoor temperature, and the maximum stretching ratio of the thick sheet is 7.5-8.8 times.
4. The production equipment for the preparation process of the bi-directional stretching polypropylene double-heat green protection film according to claim 1 comprises a mounting table (1), and is characterized in that: the middle position of the top of the mounting table (1) is provided with a bottom bin (22), the middle positions of the two ends inside the bottom bin (22) are symmetrically provided with electric hydraulic cylinders (17), the output ends of the two electric hydraulic cylinders (17) are jointly provided with a top bin (2), the two ends inside the top bin (2) and the bottom bin (22) are symmetrically provided with transverse stretching rollers (23), the two ends of the transverse stretching rollers (23) are symmetrically provided with universal joints (14), the two ends of the two sides inside the top bin (2) and the bottom bin (22) are symmetrically provided with rotating shafts (20), eight groups of rotating shafts (20) are respectively and fixedly connected with an adjacent group of universal joints (14), the two ends outside the rotating shafts (20) are provided with four groups at the same end, the second transmission gears (18) are respectively arranged at one end outside the rotating shafts (20), and the outer sides of the two groups of rotating shafts (20) close to one end of the second transmission gears (18) are symmetrically provided with second bevel gears (19), the second bevel gear (19) comprises a third driving motor, a second chain wheel and a second chain, the third driving motor is installed at the middle position of the bottom of the mounting table (1), the second chain wheels are installed at the middle positions of the outer sides of the third driving motor and the guide roller (21), the second chain wheel is arranged on the outer side of the second chain wheel, an electric heating plate (7) is installed at the middle position of the top bin (2), a longitudinal stretching assembly (3) is arranged on one side, close to the second transmission gear (18), of the top bin (2) and the bottom bin (22) together, a material conveying roller (12) is evenly arranged at the middle position of one side of the top of the mounting table (1), a third transmission assembly (9) is arranged on one end of the outer side of the material conveying roller (12) together, and a protection bin (8) is installed on one side, close to the material conveying roller (12), of the top of the mounting table (1), defeated feed roller (12) are located the inside in protection storehouse (8), trapezoidal storehouse (16) have been seted up to the inside intermediate position department in end storehouse (22), the inside in trapezoidal storehouse (16) evenly is provided with guide roll (21), the bottom of mount table (1) is provided with second taper gear (19) of being connected with guide roll (21) transmission, one side that defeated feed roller (12) was kept away from at mount table (1) top is provided with coiling mechanism (5), and the one end of coiling mechanism (5) support body installs control panel (4), control panel (4) are connected with electric heating board (7) and electric hydraulic cylinder (17) electricity respectively through the wire.
5. The production equipment for the preparation process of the bi-directional stretching polypropylene double-heat green protection film as claimed in claim 2, wherein: the longitudinal stretching assembly (3) comprises a first transmission assembly (301), a first driving motor (302), squeezing rollers (303), flattening rollers (304), U-shaped frames (305), first bevel gears (306) and annular cutters (307), the U-shaped frames (305) are symmetrically arranged on one sides, far away from the material conveying rollers (12), of the top bin (2) and the bottom bin (22), the flattening rollers (304) are symmetrically arranged at the middle positions of the inner sides of the two groups of U-shaped frames (305), the squeezing rollers (303) are arranged on one side, far away from the top bin (2), of the U-shaped frames (305), the annular cutters (307) are symmetrically arranged at two ends of the outer side of one group of flattening rollers (304), the first bevel gears (306) meshed with the second bevel gears (19) are symmetrically arranged at two ends of the outer side of the group of flattening rollers (304), the first driving motor (302) in transmission connection with the flattening rollers (304) are arranged at one end of the group of the U-shaped frames (305) at the bottom, the output end of the first driving motor (302) is provided with a first transmission assembly (301) in transmission connection with one end of a group of squeezing rollers (303), one end, far away from the first driving motor (302), of the squeezing rollers (303) is in transmission connection with a universal joint (14) through an electric heating plate (7), and the control panel (4) is electrically connected with the first driving motor (302) through a wire.
6. The production equipment for the preparation process of the bi-directional stretching polypropylene bi-thermal green protection film according to claim 2, which is characterized in that: the winding device (5) comprises a servo motor (501), winding rollers (502), a rotary table (503), driven gears (504), an installation frame (505), driving gears (506) and a second transmission assembly (507), wherein the installation frame (505) is installed on one side, away from a material conveying roller (12), of the top of the installation table (1), the rotary table (503) is symmetrically arranged at the middle positions of two sides in the installation frame (505), two groups of winding rollers (502) are evenly arranged at positions, away from the inner side of the rotary table (503), of non-circle centers, one end of the installation frame (505) is provided with the servo motor (501) in transmission connection with the adjacent group of rotary table (503), the driven gears (504) meshed with universal joints (14) are all installed at one end, away from the servo motor (501), of the four groups of winding rollers (502), of the driving gears (506) matched with the driven gears (504) are arranged at positions, away from the inner side of the non-circle centers, of the installation frame (505), one end of the outer side of the rotating shaft of the driving gear (506) is provided with a second transmission assembly (507), and the control panel (4) is electrically connected with the servo motor (501) through a wire.
7. The production equipment for the preparation process of the bi-directional stretching polypropylene double-heat green protection film as claimed in claim 2, wherein: install bin (10) of putting near one side of defeated material roller (12) at mount pad (1) top, and put bin (10) and be located the top of defeated material roller (12), the inside bilateral symmetry of bin (10) of putting is provided with crowded material roller (11) of mutually supporting, and is two sets of crowded material roller (11) is passed bin (10) and is installed intermeshing's third drive gear (6) with one end, the one end of keeping away from third drive gear (6) in bin (10) is installed and is connected with a set of crowded material roller (11) transmission second driving motor (13), intermeshing's first drive gear (15) are installed with one end to the output of second driving motor (13) and a set of defeated material roller (12).
8. The production equipment for the preparation process of the bi-directional stretching polypropylene double-heat green protection film as claimed in claim 3, wherein the production equipment comprises: first drive assembly (301) include first belt pulley and first drive belt, a set of first belt pulley is all installed to the one end of squeeze roll (303) and the output of first driving motor (302), and the outside of two sets of first belt pulleys is provided with first drive belt jointly.
9. The production equipment for the preparation process of the bi-directional stretching polypropylene double-heat green protection film as claimed in claim 4, wherein the production equipment comprises: the second transmission assembly (507) comprises a second belt pulley and a second transmission belt, the second belt pulley is installed at one end of the group of squeezing rollers (303) and one end of the rotating shaft of the driving gear (506), and the second transmission belt is arranged on the outer sides of the two groups of second belt pulleys.
10. The production equipment for the preparation process of the bi-directional stretching polypropylene double-heat green protection film as claimed in claim 2, wherein: the third transmission assembly (9) comprises a first chain wheel and a first chain, the same end of the twelve groups of material conveying rollers (12) is provided with the chain wheel, and the outer sides of the twelve groups of chain wheels are provided with the chain together.
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