CN111086246A

CN111086246A - BOPP film forming process

Info

Publication number: CN111086246A
Application number: CN201911188825.XA
Authority: CN
Inventors: 曹骏骅; 徐湘华; 陈振伟
Original assignee: Tongling Tongfei Technology Co ltd
Current assignee: Tongling Tongfei Technology Co ltd
Priority date: 2019-11-28
Filing date: 2019-11-28
Publication date: 2020-05-01

Abstract

The invention belongs to the technical field of BOPP films, and particularly relates to a forming process of a BOPP film; the extrusion trimmer comprises a body, an extrusion mechanism and a cutting block; the inner surface of the machine body is rotatably connected with a first expansion rod in the inner wall of the machine body through a rotating shaft; a second expansion rod is rotatably connected in the inner wall of the machine body at the right side of the first expansion rod through a rotating shaft; an extrusion mechanism is arranged in the inner wall of the machine body at the right side of the second expansion rod; a cutting block is fixedly connected in the inner wall of the machine body at the right side of the extrusion mechanism; the right side of the cutting block is rotatably connected with a first retracting rod in the inner walls of the machine bodies on the two sides through a rotating shaft; a second retracting rod is rotatably connected in the inner wall of the machine body at the right side of the first retracting rod through a rotating shaft; the invention is mainly used for solving the problems that when a film drawing mechanism draws a BOPP film, the thickness of the BOPP film is not uniform due to the fact that the thickness of the BOPP film is different, and after drawing is finished, the outer side edges of the BOPP film are not parallel and level and the thickness difference is large.

Description

BOPP film forming process

Technical Field

The invention belongs to the technical field of BOPP films, and particularly relates to a BOPP film forming process.

Background

Commonly used BOPP films include: common biaxially oriented polypropylene films, heat-sealing biaxially oriented polypropylene films, cigarette packaging films, biaxially oriented polypropylene pearlized films, biaxially oriented polypropylene metalized films, delustering films and the like. The BOPP film is a very important flexible packaging material, is colorless, odorless, tasteless and nontoxic, and has high tensile strength, impact strength, rigidity, toughness and good transparency. The BOPP film has low surface energy, and needs to be subjected to corona treatment before gluing or printing. After corona treatment, the BOPP film has good printing adaptability, can be subjected to chromatography printing to obtain a fine appearance effect, and is commonly used as a surface layer material of a composite film. Therefore, the BOPP film has wide market prospect. For the introduction of BOPP films, reference is made to the journal: far-south-of-the-east, centipede, introduction of key properties of BOPP film and summary of functional development, plastic packaging, 2019 (06). However, the existing BOPP film forming process has certain problems, and specifically comprises the following steps:

(1) in the process of the existing BOPP film forming process, in the processes of transverse stretching and longitudinal stretching of a BOPP film, the thickness of the BOPP film is uneven due to the fact that the thickness of the BOPP film is different when the BOPP film is stretched by a film stretching mechanism, and the problems that the outer side edge of the BOPP film is not parallel and level and the thickness difference is large are often caused due to the fact that the directions and the sizes of the pulling force are different after stretching is finished. In the prior art, related patent documents related to the extrusion and trimming of BOPP films, such as patent No. 201220090232.7, are named as a plastic film slitting machine, but this technical scheme can only slit sized plastic films according to the required size, and cannot solve the problem of size slitting in the production process.

In view of this, in order to overcome the above technical problems, the company designs and develops a BOPP film forming process, and adopts a special extrusion trimming device to solve the above technical problems.

Disclosure of Invention

In order to make up for the defects of the prior art, the invention provides a BOPP film forming process which is mainly used for solving the problems that when a film drawing mechanism draws a BOPP film, the thickness of the BOPP film is not uniform due to the fact that the thickness of the BOPP film is different, and after drawing is finished, the outer side edges of the BOPP film are not parallel and level and the thickness difference is large due to the fact that the directions and the sizes of the drawing forces are different.

The technical scheme adopted by the invention for solving the technical problems is as follows: a BOPP film forming process comprises the following steps:

s1: selecting 20-30 parts of polypropylene, 2-3 parts of an antioxidant as an auxiliary material, 1-3 parts of a heat stabilizer and 2-3 parts of a slipping agent, blending according to the proportion of 10-15:1:1:1, putting the blended materials into a mixer, mixing and stirring for 20-30 minutes, and uniformly mixing the materials;

s2: adding the uniformly mixed materials into a feeding port of a single-screw extruder, and carrying out melt plasticization on the materials by using the single-screw extruder for extrusion; putting the melted and plasticized material into another single-screw extruder connected with the single-screw extruder in series for continuous plasticization, then extruding, cooling by a cold drum at 25-28 ℃ to obtain a thick sheet, stripping the formed thick sheet from the cold drum by a stripping roller, and finishing the sheet casting process of the thick sheet by a tension control roller, a guide roller and a thickness gauge;

s3: firstly, longitudinally stretching the cast sheet obtained in the step S2, wherein the longitudinal stretching temperature is 95-105 ℃, and the longitudinal stretching ratio of the formed film is 2-2.5 times; then transversely stretching the longitudinally stretched film at the temperature of 130-140 ℃, wherein the transverse stretching ratio of the formed film is 3-5 times; finally, longitudinally stretching the transversely stretched film, wherein the longitudinal stretching temperature is 85-95 ℃, and the longitudinal stretching ratio of the formed film is 1.5-2.5 times;

s4: after the stretching is finished, the film is sent into a corona device for corona treatment for 20-30 minutes, and after the corona is finished, the film is put into an extruding trimmer for extruding and trimming;

s5: and after the extrusion trimming of the film is finished, putting the film roll into an aging treatment frame, performing aging treatment, keeping the temperature at 25-30 ℃ and the humidity at 50-70% for three days, and finally packaging to obtain a finished product.

The extrusion edge trimmer in the S4 comprises a machine body, an extrusion mechanism and a cutting block; the inner surface of the machine body is rotatably connected with a first expansion rod in the inner wall of the machine body through a rotating shaft; a second expansion rod is rotatably connected in the inner wall of the machine body at the right side of the first expansion rod through a rotating shaft and is higher than the first expansion rod; an extrusion mechanism is arranged in the inner wall of the machine body at the right side of the second expansion rod; the extrusion mechanism comprises a first extrusion rod and a second extrusion rod; the first extrusion rod and the second extrusion rod are rotatably connected with the machine body through rotating shafts, and the first extrusion rod and the second extrusion rod correspond to each other; the rotating shafts in the first extrusion rod and the second extrusion rod penetrate through the inner wall of the machine body and are fixedly connected with a driving shaft of a first motor; a cutting block is fixedly connected in the inner wall of the machine body at the right side of the extrusion mechanism; a cutting groove is formed in the inner wall of the cutting block, and the cutting groove penetrates through the cutting block; a sliding groove is formed in the inner wall of the cutting block above the cutting groove and is communicated with the cutting groove; the two sides of the sliding chute are connected with sliding blocks in a sliding manner, and the lower surfaces of the sliding blocks are fixedly connected with cutting knives; triangular grooves which are uniformly distributed are formed in the inner wall of the cutting block below the cutting groove and are communicated with the cutting groove; the two sides of the cutting groove are designed to extend downwards; the corner of the downward extension of the cutting groove is in an arc design; pressing wheels are fixedly connected in the extension grooves on the two sides of the cutting groove, and the pressing wheels are elastic telescopic rods; the right side of the cutting block is rotatably connected with a first retracting rod in the inner walls of the machine bodies on the two sides through a rotating shaft; the first belt pulleys are fixedly connected to the outer surfaces of the rotating shafts on the opposite sides of the two first retracting rods and the inner wall of the machine body; a second retracting rod is rotatably connected in the inner wall of the machine body at the right side of the first retracting rod through a rotating shaft; a rotating shaft in the second rod penetrates through the inner wall of the machine body to be fixedly connected with a driving shaft of a second motor, and the rotating speed of the second motor is the same as that of the first motor; the rotating shafts on two sides of the second retraction rod are fixedly connected with second belt pulleys, and the second belt pulleys are rotatably connected with the first belt pulley through belt ropes; when the film stretching and trimming device works, when the film needs to be extruded and trimmed, the film is firstly paved on the upper surface of the first expansion rod and then extends into the extruding mechanism through the lower surface of the second expansion rod, when the film is driven by the first expansion rod to move rightwards, the film can be flattened on the first expansion rod through the rotation of the first expansion rod, so that the surface of the film is prevented from wrinkling, the influence on the size precision of the film during subsequent cutting is avoided, when the film passes through the second expansion rod, the film can be further flattened, the surface wrinkling of the film is prevented from influencing the size, when the film passes through the extruding mechanism, the first motor drives the extruding mechanism to rotate, as the first extruding rod and the second extruding rod correspond to each other and the rotating directions are opposite, the film can be flattened due to uneven stretching, and the uneven thickness error caused by uneven stretching can be prevented from being uneven in the process, the film is pressed to be attached to the inner wall of the cutting groove by the pressing wheel, so that the film can be tightly pressed in the process, the situation that the film is folded in the cutting groove is prevented, because the pressing wheel is an elastic telescopic rod, when the film with larger thickness passes through the pressing wheel, the pressing wheel contracts backwards, the film can be prevented from being broken due to larger pressing force in the process, the pressing wheel can be protected, the pressing wheel is prevented from being clamped by the film, so that the pressing wheel is prevented from being damaged, when the film moves in the cutting groove, the cutting knives on the two sides of the cutting groove can cut off the uneven places of the edge surfaces on the two sides of the film, so that the film is cut into the same width, and because the cutting knives are fixedly connected with the sliding blocks in the sliding groove, and triangular grooves which are uniformly distributed are arranged in the inner wall below the cutting groove, so that the position of the cutting knife can be adjusted at will according to the required width of the film, thereby obtaining films with different widths, when the cutting of the films is finished, the second motor drives the second retracting rod to rotate, because the rotating speed of the second motor is the same as that of the first motor, the speed of the winding rod for winding the film is the same as that of the extrusion mechanism for extruding the film, meanwhile, the film can be prevented from being pulled due to different speeds at the two sides, so that the film is damaged, because the second belt pulley fixedly connected with the second retracting rod is rotationally connected with the first belt pulley fixedly connected with the first retracting rod through the belt rope, thereby the second is received the pole and is driven first receipts pole and rotate, and speed the same, and on the film that the cutting is good was drawn into the second and is received the pole simultaneously, the waste material that the film both sides were cut off was drawn into on the first receipts pole.

Preferably, a circular groove is formed in the inner wall of the first extrusion rod, and the rotating shaft penetrates through the circular groove; a lubricating oil tank is arranged on the outer side of the machine body and is communicated with the circular groove through a guide pipe; liquid leakage grooves which are uniformly distributed are formed in the inner wall of the first extrusion rod above the circular groove; a first air bag is fixedly connected to the outer surface of the rotating shaft in the cavity of the extrusion rod; the end surfaces of the two sides of the first extrusion rod are fixedly connected with second air bags which are uniformly arranged, and the second air bags are communicated with the first air bags through air pipes; the end surfaces of the two sides of the second extrusion rod are fixedly connected with guide rods which are uniformly arranged, and the number of the guide rods is the same as that of the second air bags and the guide rods are in one-to-one correspondence with the second air bags; when the film extruding machine works, when a film is extruded by the extruding mechanism, because the lubricating oil tank arranged on the outer side of the machine body is communicated with the circular groove arranged in the inner wall of the first extruding rod through the guide pipe, lubricating oil can enter the circular groove through the guide pipe, because the first air bag fixedly connected in the circular groove is communicated with the second air bags on two sides of the first extruding rod through the air pipe, when the first extruding rod and the second extruding rod rotate, the guide rods fixedly connected with the end surfaces on two sides of the second extruding rod extrude the second air bags, because the second air bags are subjected to the extrusion force of the guide rods, air in the second air bags enters the first air bags through the air pipe, because the first air bags are expanded under the pressure of the air, the lubricating oil in the circular groove flows out through the leakage groove at the moment, so as to circulate, the outer surface of the first extruding rod can be lubricated by continuously flowing out from the leakage groove, thereby preventing the first extruding rod from generating the blocking influence on the extruding process when the thicker film is, meanwhile, the film can be lubricated, the film is prevented from being stuck when entering the cutting groove, the film is damaged, the cutting knife can be lubricated at the same time, and the cutting knife is prevented from being corroded due to overlong service time.

Preferably, each liquid leakage groove is designed to be a trapezoidal groove; the during operation because the weeping groove is the design of dovetail groove, when lubricating oil flowed through the weeping groove, can be with the even distribution of lubricating oil on first squeeze bar and film to further lubricated first squeeze bar and film prevents that lubricating oil from distributing unevenly, makes first squeeze bar and film take place to damage.

Preferably, the two cutting knives comprise an annular rod, a round rod and a rotating wheel; the round rod is connected in the inner wall of the annular plate in a sliding manner through a spring; the inner wall of the round rod is fixedly connected with a conical cutter through a spring; both sides of the round bar are rotatably connected with rotating wheels through rotating shafts; the during operation, because the cutting knife is elastic design, meet thicker film when the conical cutter is cutting the film and make, elastic design's cutting knife can cushion the resistance that the film brought, thereby better protection conical cutter prevents that the conical cutter from taking place to damage, because the round bar both sides all are connected with the runner through the pivot rotation, the runner can be pressed the film in the runner below when cutting the film, thereby improve the tension of film, it is easier to make the conical cutter cut the film, simultaneously because the cutting knife is elastic design, when the great film of thickness is when the runner, the runner is shrink backward this moment, can prevent at this in-process that the film from breaking because of receiving great extrusion force, simultaneously can also protect the runner, prevent that the film from blocking the runner and making the runner take place to damage.

Preferably, the outer surface of each rotating wheel is fixedly connected with a rubber strip; the during operation, because the runner surface all links firmly the rubber strip, can make the better film that pushes down of runner to it is easier to make the toper sword cutting, the rubber strip has certain elasticity simultaneously, can also cushion the extrusion force that the film produced to the runner, thereby better protection cutting knife.

Preferably, the central line of the outer surface of the first expansion rod is positioned on the outer surfaces of two sides of the central line of the first expansion rod and fixedly connected with spiral strips, and the spiral directions of the spiral strips are opposite; the second expansion rod has the same structure as the second expansion rod; the during operation because first expansion rod all is equipped with the helical strip that spiral direction is opposite with second expansion rod surface, when expansion rod rotated and drives the helical strip and rotate, because the helical strip outwards expands to with the outside stretching of film, thereby make better the shakeout of film on expansion rod at this in-process, prevent that the film from taking place the size precision that the fold influences the film on expansion rod.

Preferably, one end of each guide rod, which is close to the inner wall of the machine body, is fixedly connected with a link rod; the rubber bag is fixedly connected in the inner wall of the machine body and corresponds to the section rod; a spring is fixedly connected in the rubber bag; a pull rope is fixedly connected in the inner wall of the rubber bag, and the other end of the pull rope is fixedly connected with the upper surface of the conical cutter; the during operation, when the guide arm drives festival pole and rotates, because the rubber bag that organism inner wall linked firmly corresponds each other with festival pole to constantly extrude the rubber bag, at the in-process of festival pole extrusion rubber bag, because the rubber bag links firmly through stay cord and toper sword upper surface, thereby make tensile drive toper sword be concertina movement, thereby improve the cutting force of toper sword cutting film, can also prevent simultaneously that the toper sword from cutting the film, always with same place cutting film, make the toper sword take place the cutting ability that wearing and tearing influence toper sword.

The invention has the following beneficial effects:

1. the invention has the advantages that through the arrangement of the extruding mechanism, the first air bag fixedly connected in the circular groove is communicated with the second air bags at two sides of the first extruding rod through the air pipes, when the first extruding rod and the second extruding rod rotate, the guide rods fixedly connected with the end surfaces at two sides of the second extruding rod extrude the second air bags, because the second air bags are extruded by the guide rods, the gas in the second air bags enters the first air bags through the air pipes, the first air bags expand under the pressure of the gas, at the same time, the lubricating oil in the circular groove flows out through the liquid leakage grooves to circulate, in the process, the lubricating oil continuously flows out from the liquid leakage grooves, the outer surface of the first extruding rod can be lubricated, the first extruding rod is prevented from being blocked when extruding a thicker film to influence the extruding process, the film can be lubricated, the film is prevented from being blocked when entering the cutting groove, the film is damaged, and the cutting knife can be lubricated at the same time, prevent the cutting knife from rusting when the cutting knife is used for a long time.

2. According to the invention, the cutting knife is arranged, and is of an elastic design, when the conical knife is used for cutting a film, the cutting knife is made to meet a thick film, the elastic design can buffer resistance brought by the film, so that the conical knife is better protected from being damaged, and because the two sides of the round rod are rotatably connected with the rotating wheels through the rotating shafts, the rotating wheels can press the film below the rotating wheels when the film is cut, so that the tension of the film is improved, the conical knife is enabled to cut the film more easily, and meanwhile, because the cutting knife is of an elastic design, when the film with larger thickness passes through the rotating wheels, the rotating wheels shrink backwards, the film can be prevented from being broken due to larger extrusion force in the process, and meanwhile, the rotating wheels can be protected, and the rotating wheels are prevented from being damaged due.

Drawings

The invention will be further explained with reference to the drawings.

FIG. 1 is a flow chart of the present invention;

FIG. 2 is a body view of the press edger of the present invention;

FIG. 3 is a cross-sectional view of the extrusion mechanism of the present invention;

FIG. 4 is an enlarged view of a portion of FIG. 3 at A;

FIG. 5 is an enlarged view of a portion of FIG. 3 at B;

FIG. 6 is a cross-sectional view of the present invention cutting a quick;

FIG. 7 is an enlarged view of a portion of FIG. 6 at C;

in the figure: the machine body 1, the first expansion rod 11, the second expansion rod 12, the spiral strip 13, the first take-up rod 14, the first belt pulley 15, the second take-up rod 16, the second belt pulley 17, the belt rope 18, the extrusion mechanism 2, the lubricating oil tank 21, the first extrusion rod 22, the circular groove 23, the liquid leakage groove 24, the first air bag 25, the second air bag 26, the second extrusion rod 27, the guide rod 28, the node rod 29, the rubber bag 291, the cutting block 3, the cutting groove 31, the sliding groove 32, the sliding block 33, the cutting knife 34, the annular rod 35, the circular rod 36, the rotating wheel 37, the conical knife 38, the rubber strip 39, the triangular groove 311 and the pressing wheel 321.

Detailed Description

A BOPP film forming process according to an embodiment of the present invention will be described below with reference to fig. 1 to 7.

As shown in fig. 1 to 7, the BOPP film forming process of the present invention includes the following steps:

The extrusion edge trimmer described in S4 includes a machine body 1, an extrusion mechanism 2, and a cutting block 3; a first expansion rod 11 is rotatably connected to the inner surface of the machine body 1 in the inner wall of the machine body 1 through a rotating shaft; a second expansion rod 12 is rotatably connected in the inner wall of the machine body 1 at the right side of the first expansion rod 11 through a rotating shaft, and the second expansion rod 12 is higher than the first expansion rod 11; the right side of the second expansion rod 12 is provided with an extrusion mechanism 2 in the inner wall of the machine body 1; the pressing mechanism 2 comprises a first pressing rod 22 and a second pressing rod 27; the first extrusion rod 22 and the second extrusion rod 27 are rotatably connected with the machine body 1 through rotating shafts, and the first extrusion rod 22 and the second extrusion rod 27 correspond to each other; the rotating shafts in the first extrusion rod 22 and the second extrusion rod 27 penetrate through the inner wall of the machine body 1 and are fixedly connected with a driving shaft of a first motor; a cutting block 3 is fixedly connected in the inner wall of the machine body 1 at the right side of the extrusion mechanism 2; a cutting groove 31 is formed in the inner wall of the cutting block, and the cutting groove 31 penetrates through the cutting block 3; a sliding groove 32 is formed in the inner wall of the cutting block 3 above the cutting groove 31, and the sliding groove 32 is communicated with the cutting groove 31; the two sides of the sliding groove 32 are both connected with sliding blocks 33 in a sliding manner, and the lower surfaces of the sliding blocks 33 are fixedly connected with cutting knives 34; triangular grooves 311 which are uniformly distributed are formed in the inner wall of the cutting block 3 below the cutting groove 31, and the triangular grooves 311 are communicated with the cutting groove 31; the two sides of the cutting groove 31 are designed to extend downwards; the downward extending corner of the cutting groove 31 is designed into an arc shape; pressing wheels 321 are fixedly connected in the extending grooves on the two sides of the cutting groove 31, and the pressing wheels 321 are elastic telescopic rods; the right side of the cutting block 3 is rotatably connected with a first retracting rod 14 in the inner walls of the machine bodies 1 at the two sides through a rotating shaft; the two first retracting rods 14 are fixedly connected with a first belt pulley 15 on the outer surface of the rotating shaft at the opposite side of the inner wall of the machine body 1; a second retracting rod 16 is rotatably connected in the inner wall of the machine body 1 at the right side of the first retracting rod 14 through a rotating shaft; a rotating shaft in the second retracting rod 16 penetrates through the inner wall of the machine body 1 and is fixedly connected with a driving shaft of a second motor, and the rotating speed of the second motor is the same as that of the first motor; the rotating shafts on two sides of the second retracting rod 16 are fixedly connected with second belt pulleys 17, and the second belt pulleys 17 are rotatably connected with the first belt pulley 15 through belt ropes 18; when the film trimming device works, when the film needs to be extruded and trimmed, the film is firstly paved on the upper surface of the first expansion rod 11 and then extends into the extruding mechanism 2 through the lower surface of the second expansion rod 12, when the film is driven by the first expansion rod 11 to move rightwards, the film can be flattened on the first expansion rod 11 through the rotation of the first expansion rod 11, so that the surface of the film is prevented from wrinkling, the influence on the size precision of the film during subsequent cutting is avoided, when the film passes through the second expansion rod 12, the film can be further flattened, the surface wrinkling of the film is prevented from influencing the size, when the film passes through the extruding mechanism 2, the first motor drives the extruding mechanism 2 to rotate, because the first extruding rod 22 and the second extruding rod 27 correspond to each other and the rotating directions are opposite, the film can be flattened during stretching, because of thickness errors generated by uneven stretching, the uneven surface thickness of the film can be prevented in the process, the protrusions and the unevennesses are formed in the subsequent winding process, after the film is extruded, the film moves into the cutting groove 31, the two sides of the film are respectively placed into the extending grooves on the two sides of the cutting groove 31, the film is pressed by the pressing wheel 321 to be attached to the inner wall of the cutting groove 31, the film can be compressed in the process so as to prevent the film from being folded in the cutting groove 31, because the pressing wheel 321 is an elastic telescopic rod, when the film with larger thickness passes through the pressing wheel 321, the pressing wheel 321 is retracted backwards, the film can be prevented from being broken due to larger extrusion force in the process, the pressing wheel 321 can be protected, the pressing wheel 321 is prevented from being clamped by the film so as to prevent the pressing wheel 321 from being damaged, when the film moves in the cutting groove 31, the cutting knives 34 on the two sides of the cutting groove 31 can cut off the uneven parts of the two side surfaces of the film, so that the film can be cut into the same, because the cutting knife 34 is fixedly connected with the sliding block 33 in the sliding groove 32, and the triangular grooves 311 which are uniformly arranged are arranged in the inner wall below the cutting groove 31, the position of the cutting knife 34 can be adjusted at will according to the width required by the film, so that films with different widths can be obtained, after the film cutting is finished, the second motor drives the second take-up rod 16 to rotate, because the rotating speed of the second motor is the same as that of the first motor, the speed of the take-up rod for taking up the films is the same as that of the extrusion mechanism 2 for extruding the films, and meanwhile, the film can be prevented from being pulled due to different speeds at two sides, so that the films are damaged, because the second belt pulley 17 fixedly connected on the second take-up rod 16 is rotatably connected with the first belt pulley 15 fixedly connected on the first take-up rod 14 through the belt rope 18, the second take-up rod 16 drives the first take-up rod 14 to rotate at the same speed, and meanwhile, on the cut films on the second take, the scrap cut on both sides of the film is wound onto the first take-up reel 14.

Preferably, a circular groove 23 is formed in the inner wall of the first extrusion rod 22, and the rotating shaft passes through the circular groove 23; a lubricating oil tank 21 is arranged on the outer side of the machine body 1, and the lubricating oil tank 21 is communicated with the circular groove 23 through a guide pipe; liquid leakage grooves 24 which are uniformly distributed are formed in the inner wall of the first extrusion rod 22 above the circular groove 23; a first air bag 25 is fixedly connected to the outer surface of the rotating shaft in the cavity of the extrusion rod; the end surfaces of the two sides of the first extrusion rod 22 are fixedly connected with second air bags 26 which are uniformly arranged, and the second air bags 26 are communicated with the first air bag 25 through air pipes; the end surfaces of the two sides of the second extrusion rod 27 are fixedly connected with guide rods 28 which are uniformly arranged, and the number of the guide rods 28 is the same as that of the second air bags 26 and corresponds to that of the second air bags one by one; when the film extruding mechanism 2 works, when the film is extruded by the extruding mechanism 2, because the lubricating oil tank 21 arranged on the outer side of the machine body 1 is communicated with the circular groove 23 arranged in the inner wall of the first extruding rod 22 through the guide pipe, the lubricating oil can enter the circular groove 23 through the guide pipe, because the first air bag 25 fixedly connected in the circular groove 23 is communicated with the second air bags 26 on both sides of the first extruding rod 22 through the air pipe, when the first extruding rod 22 and the second extruding rod 27 rotate, the guide rods 28 fixedly connected on the end surfaces on both sides of the second extruding rod 27 extrude the second air bags 26, because the second air bags 26 are extruded by the guide rods 28, the air in the second air bags 26 enters the first air bags 25 through the air pipe, because the first air bags 25 are expanded by the pressure of the air, at the moment, the lubricating oil in the circular groove 23 flows out through the liquid leakage groove 24, so as to circulate, in the process, the lubricating oil continuously flows out from the liquid, can lubricate first stripper bar 22 surface to prevent that first stripper bar 22 from producing the card when the extrusion is thicker film and die the extrusion process of influence, can also lubricate the film simultaneously, prevent that the film from taking place the card when getting into cutting groove 31 and die, thereby damage the film, can also lubricate cutting knife 34 simultaneously, prevent that cutting knife 34 live time overlength from taking place the corrosion.

Preferably, each of the weep slots 24 is of a trapezoidal slot design; during operation, because the weeping groove 24 is the design of dovetail groove, when lubricating oil flowed out through weeping groove 24, can be with the even distribution of lubricating oil on first squeeze bar 22 and film to further lubricated first squeeze bar 22 and film prevents that lubricating oil from distributing unevenly, makes first squeeze bar 22 and film take place to damage.

Preferably, the two cutting knives 34 comprise an annular rod 35, a round rod 36 and a runner 37; the round rod 36 is connected in the inner wall of the annular plate in a sliding mode through a spring; a conical knife 38 is fixedly connected in the inner wall of the round rod 36 through a spring; both sides of the round bar 36 are rotatably connected with rotating wheels 37 through rotating shafts; the during operation, because cutting knife 34 is elastic design, meet thicker film when conical cutter 38 cuts the film and make, elastic design's cutting knife 34 can cushion the resistance that the film brought, thereby better protection conical cutter 38 prevents conical cutter 38 from taking place to damage, because round bar 36 both sides all are connected with runner 37 through the pivot rotation, runner 37 can be pressed the film in runner 37 below when cutting the film, thereby improve the tension of film, it is easier to make conical cutter 38 cut the film, simultaneously because cutting knife 34 is elastic design, when the great film of thickness is when runner 37, runner 37 contracts backward this moment, can prevent at this in-process that the film from breaking because of receiving great extrusion force, simultaneously can also protect runner 37, prevent that the film from blocking runner 37 and making runner 37 take place to damage.

Preferably, the outer surface of each rotating wheel 37 is fixedly connected with a rubber strip 39; during operation, because runner 37 surface has all linked firmly rubber strip 39, can make runner 37 push down the film better to it is easier to make the cutting of toper sword 38, rubber strip 39 has certain elasticity simultaneously, can also cushion the extrusion force that the film produced runner 37, thereby better protection cutting knife 34.

Preferably, the outer surfaces of the first expansion rod 11, which are positioned at the midline and on both sides of the midline, are fixedly connected with the spiral strips 13, and the spiral directions of the spiral strips 13 are opposite; the second expansion rod 12 has the same structure as the second expansion rod 12; the during operation, because first expansion rod 11 all is equipped with spiral strip 13 that spiral direction is opposite with second expansion rod 12 surface, when expansion rod rotates and drives spiral strip 13 and rotate, because spiral strip 13 outwards expands to outwards stretch the film, thereby make better the shakeout of film on expansion rod at this in-process, prevent that the film from taking place the size precision that the fold influences the film on expansion rod.

Preferably, one end of each guide rod 28 close to the inner wall of the machine body 1 is fixedly connected with a link rod 29; the inner wall of the machine body 1 is fixedly connected with a rubber bag 291, and the rubber bag 291 corresponds to the joint rod 29; a spring is fixedly connected in the rubber bag 291; a pull rope is fixedly connected in the inner wall of the rubber bag 291, and the other end of the pull rope is fixedly connected with the upper surface of the conical knife 38; during operation, when guide arm 28 drives festival pole 29 and rotates, because rubber bag 291 that organism 1 inner wall linked firmly corresponds each other with festival pole 29 to constantly extrude rubber bag 291, at the in-process of festival pole 29 extrusion rubber bag 291, because rubber bag 291 links firmly through stay cord and toper sword 38 upper surface, thereby make tensile drive toper sword 38 do concertina movement, thereby improve the cutting power of toper sword 38 cutting film, can also prevent simultaneously that toper sword 38 from cutting the film, always with same place cutting film, make toper sword 38 take place to abrade and influence the cutting ability of toper sword 38.

The specific working process is as follows:

when the film flattening machine works, when a film needs to be extruded and trimmed, the film is firstly paved on the upper surface of a first expansion rod 11 and then extends into a extruding mechanism 2 through the lower surface of a second expansion rod 12, when the film is driven to move rightwards by the first expansion rod 11, the film can be flattened on the first expansion rod 11 through the rotation of the first expansion rod 11, when the film passes through the second expansion rod 12, the film can be further flattened to prevent the surface of the film from being wrinkled and influencing the size, when the film passes through the extruding mechanism 2, a first motor drives the extruding mechanism 2 to rotate, because a first extruding rod 22 and a second extruding rod 27 correspond to each other and have opposite rotating directions, the thickness error generated by uneven stretching can be flattened when the film is stretched, the film can be prevented from being uneven in surface thickness in the process, and after the film is extruded, the film moves into a cutting groove 31, at this time, two sides of the film are respectively placed into the extending grooves at two sides of the cutting groove 31, and the film is pressed to be attached to the inner wall of the cutting groove 31 by the pressing wheel 321, when the film moves in the cutting groove 31, the cutting knives 34 at two sides of the cutting groove 31 can cut off the uneven parts of the side surfaces at two sides of the film, so as to cut the film into the same width, because the cutting knives 34 are fixedly connected with the sliding blocks 33 in the sliding grooves 32, and the triangular grooves 311 which are uniformly arranged are arranged in the inner wall below the cutting groove 31, the position of the cutting knives 34 can be randomly adjusted according to the required width of the film, after the film cutting is finished, the second motor drives the second take-up rod 16 to rotate, because the rotating speed of the second motor is the same as that of the first motor, the speed of the take-up rod take-up film can be the same as that of the extruding mechanism 2 extrudes the film, because the second belt pulley 17 fixedly connected on the second take-up rod 16 is rotatably connected with the first belt, therefore, the second take-up rod 16 drives the first take-up rod 14 to rotate at the same speed, the cut film is rolled on the second take-up rod 16, and the waste materials cut off at two sides of the film are rolled on the first take-up rod 14.

The foregoing illustrates and describes the principles, general features, and advantages of the present invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.

Claims

1. A BOPP film forming process is characterized in that: the method comprises the following steps:

The extrusion edge trimmer in S4 comprises a machine body (1), an extrusion mechanism (2) and a cutting block (3); the inner surface of the machine body (1) is rotatably connected with a first expansion rod (11) in the inner wall of the machine body (1) through a rotating shaft; a second expansion rod (12) is rotatably connected in the inner wall of the machine body (1) at the right side of the first expansion rod (11) through a rotating shaft, and the second expansion rod (12) is higher than the first expansion rod (11); an extrusion mechanism (2) is arranged in the inner wall of the machine body (1) at the right side of the second expansion rod (12); the extrusion mechanism (2) comprises a first extrusion rod (22) and a second extrusion rod (27); the first extrusion rod (22) and the second extrusion rod (27) are rotatably connected with the machine body (1) through rotating shafts, and the first extrusion rod (22) and the second extrusion rod (27) correspond to each other; rotating shafts in the first extrusion rod (22) and the second extrusion rod (27) penetrate through the inner wall of the machine body (1) and are fixedly connected with a driving shaft of a first motor; the right side of the extrusion mechanism (2) is fixedly connected with a cutting block (3) in the inner wall of the machine body (1); a cutting groove (31) is formed in the inner wall of the cutting block, and the cutting groove (31) penetrates through the cutting block (3); a sliding groove (32) is formed in the inner wall of the cutting block (3) above the cutting groove (31), and the sliding groove (32) is communicated with the cutting groove (31); both sides of the sliding chute (32) are connected with sliding blocks (33) in a sliding manner, and the lower surfaces of the sliding blocks (33) are fixedly connected with cutting knives (34); triangular grooves (311) which are uniformly distributed are formed in the inner wall of the cutting block (3) below the cutting groove (31), and the triangular grooves (311) are communicated with the cutting groove (31); the two sides of the cutting groove (31) are designed to extend downwards; the corners of the downward extension of the cutting grooves (31) are designed into arc shapes; pressing wheels (321) are fixedly connected in the extending grooves on the two sides of the cutting groove (31), and the pressing wheels (321) are elastic telescopic rods; the right side of the cutting block (3) is rotatably connected with a first retracting rod (14) in the inner walls of the machine bodies (1) at the two sides through a rotating shaft; the two first retracting rods (14) are fixedly connected with a first belt pulley (15) on the outer surface of the rotating shaft at the side opposite to the inner wall of the machine body (1); a second retracting rod (16) is rotatably connected in the inner wall of the machine body (1) at the right side of the first retracting rod (14) through a rotating shaft; a rotating shaft in the second rod (16) penetrates through the inner wall of the machine body (1) and is fixedly connected with a driving shaft of a second motor, and the rotating speed of the second motor is the same as that of the first motor; the second belt pulleys (17) are fixedly connected to the rotating shafts on the two sides of the second take-up rod (16), and the second belt pulleys (17) are rotatably connected with the first belt pulley (15) through belt ropes (18).

2. The BOPP film forming process according to claim 1, wherein: a circular groove (23) is formed in the inner wall of the first extrusion rod (22), and the rotating shaft penetrates through the circular groove (23); a lubricating oil tank (21) is arranged on the outer side of the machine body (1), and the lubricating oil tank (21) is communicated with the circular groove (23) through a guide pipe; liquid leakage grooves (24) which are uniformly distributed are formed in the inner wall of the first extrusion rod (22) above the circular groove (23); a first air bag (25) is fixedly connected to the outer surface of the rotating shaft in the cavity of the extrusion rod; the end surfaces of the two sides of the first extrusion rod (22) are fixedly connected with second air bags (26) which are uniformly arranged, and the second air bags (26) are communicated with the first air bag (25) through air pipes; the two side end faces of the second extrusion rod (27) are fixedly connected with guide rods (28) which are uniformly arranged, and the number of the guide rods (28) is the same as that of the second air bags (26) and the guide rods correspond to that of the second air bags one by one.

3. The BOPP film forming process according to claim 2, wherein: each liquid leakage groove (24) is designed to be a trapezoidal groove.

4. The BOPP film forming process of claim 3, wherein: the two cutting knives (34) comprise annular rods (35), round rods (36) and rotating wheels (37); the round rod (36) is connected in the inner wall of the annular plate in a sliding mode through a spring; a conical knife (38) is fixedly connected in the inner wall of the round rod (36) through a spring; and both sides of the round rod (36) are rotatably connected with rotating wheels (37) through rotating shafts.

5. The BOPP film forming process of claim 3, wherein: the outer surface of each rotating wheel (37) is fixedly connected with a rubber strip (39).

6. The BOPP film forming process according to claim 1, wherein: the midline of the outer surface of the first expansion rod (11) is positioned at the outer surfaces of two sides of the midline of the first expansion rod (11) and fixedly connected with spiral strips (13), and the spiral directions of the spiral strips (13) are opposite; the second expansion rod (12) has the same structure as the second expansion rod (12).

7. The BOPP film forming process according to claim 2, wherein: one end of each guide rod (28) close to the inner wall of the machine body (1) is fixedly connected with a link rod (29); a rubber bag (291) is fixedly connected in the inner wall of the machine body (1), and the rubber bag (291) corresponds to the joint rod (29); a spring is fixedly connected in the rubber bag (291); a pull rope is fixedly connected in the inner wall of the rubber bag (291), and the other end of the pull rope is fixedly connected with the upper surface of the conical knife (38).