CN111590936A - Production method of high-shrinkage polyolefin heat-shrinkable film - Google Patents
Production method of high-shrinkage polyolefin heat-shrinkable film Download PDFInfo
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- CN111590936A CN111590936A CN202010364941.9A CN202010364941A CN111590936A CN 111590936 A CN111590936 A CN 111590936A CN 202010364941 A CN202010364941 A CN 202010364941A CN 111590936 A CN111590936 A CN 111590936A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
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Abstract
The invention belongs to the technical field of polyolefin film preparation, in particular to a production method of a high-shrinkage polyolefin heat-shrinkable film, wherein an expanding device adopted in the method comprises a base; the top of the base is provided with an expanding unit for widening the pre-stretched blank, one side of the expanding unit is fixedly connected with a pair of supporting frames, a pair of feeding rollers are rotatably connected between the supporting frames, and the feeding rollers are used for feeding the pre-stretched blank into the expanding unit; one side of the base is rotatably connected with a material discharging roll through a bracket, and pre-stretched blanks released by the material discharging roll are fed between two feeding rollers; the pre-stretched blank between the feeding roller and the discharging roll is provided with the first roller, and the first roller is internally provided with the heating oil.
Description
Technical Field
The invention belongs to the technical field of polyolefin film preparation, and particularly relates to a production method of a high-shrinkage polyolefin heat-shrinkable film.
Background
The shrink film has high puncture resistance, good shrinkage and certain shrinkage stress. The product is mainly used for the sale and transportation process of various products and is used for stabilizing, covering and protecting the products. The shrink package not only has beautiful appearance, but also plays the roles of moisture prevention, dust prevention, looseness prevention, theft prevention and integration.
1) The PE heat shrinkable film is widely suitable for the integral assembly packaging of products such as wines, pop cans, mineral water, various beverages, cloth and the like, and the products have good flexibility, strong impact resistance and tearing resistance, are not easy to damage, are not easy to damp and have large shrinkage;
2) the PVC film has the characteristics of high transparency, good glossiness, high shrinkage and the like;
3) the POF has the characteristics of high surface glossiness, good toughness, high tear strength, uniform heat shrinkage, suitability for full-automatic high-speed packaging and the like, and is a replacement product of the traditional PVC heat shrinkable film. POF is the meaning of a heat shrinkable film, is called as a multilayer co-extruded polyolefin heat shrinkable film and is processed by using linear low-density polyethylene as an intermediate layer (LLDPE) and copolymerized propylene (pp) as an inner layer and an outer layer through three extruders for plasticizing and extruding, and then performing die head molding, bubble blowing and other special processes.
4) The OPS heat shrinkable film (oriented polystyrene) is a novel packaging material for pasting an OPS heat shrinkable film body, and has the advantages of high strength, high rigidity, stable shape, good glossiness and transparency.
5) The PET heat-shrinkable polyester film has the characteristics that: it is stable at room temperature, shrinks when heated (above the glass transition temperature), and is heat-shrinkable by more than 70% in one direction.
Some technical solutions related to the preparation of heat-shrinkable films have appeared in the prior art, and for example, a chinese patent with application number 2007101937967 discloses an apparatus and a method for preparing biaxially oriented polytetrafluoroethylene films, which comprises five parts, namely a base tape feeding and compounding unit, a longitudinal stretching unit, a transverse stretching unit, a solidification and shaping unit and a cooling unit. Wherein the baseband feeding composite unit is single-layer or multi-layer baseband feeding; the longitudinal stretching unit comprises three sections of drying ovens and 9 expanding rollers which are arranged in parallel; the transverse stretching and the unit are carried out in a curing and shaping oven, so that the film is ensured to be uniformly heated. The energy consumption for processing the polytetrafluoroethylene film by using the equipment is lower than that of the traditional processing equipment, and the multilayer polytetrafluoroethylene film can be processed, so that the interlayer bonding is good, the delamination is not easy to occur, the application range is wide, and the production efficiency is high; however, when the base band is expanded and tensioned in the prior art, the base band is stretched when the base band is not completely and uniformly heated and softened due to the fact that the tensioning force is large, local over-stretching of the base band is easily caused, and other parts are not fully stretched, so that the thickness uniformity of a finished film product is influenced, and the production quality of the film is influenced.
Disclosure of Invention
The invention provides a production method of a high-shrinkage polyolefin heat-shrinkable film, which aims to make up the defects of the prior art and solve the problems that when a base band is subjected to amplitude expansion and tension in the prior art, the base band is stretched when the base band is not completely and uniformly heated and softened, so that the base band is easily partially over-stretched, and other parts are not fully stretched, so that the thickness uniformity of a finished film product is influenced, and the production quality of the film is influenced.
The technical scheme adopted by the invention for solving the technical problems is as follows: the invention relates to a production method of a high-shrinkage polyolefin heat-shrinkable film, which comprises the following steps:
s1, uniformly mixing the resin, the polyurethane and the adhesive particles, drying the mixture by a drying device to enable the water content of the mixture to be lower than 0.5%, then carrying out hot melting on the mixture and extruding the mixture into a strip-shaped blank, cooling the blank in a water bath, then air-drying the blank, and winding and storing the blank;
s2, feeding the blank roll obtained in the S1 as a core layer and the master batch as a surface layer into a compound roller for heating and laminating, laminating repeatedly for three times, extruding to form a tube blank, degreasing the tube blank, cooling to room temperature, and feeding the tube blank into a stretcher for heating and stretching to form a pre-stretched blank; the heating stage is divided into three stages, the temperature is controlled to be 50-60 ℃ in the first stage, the temperature is controlled to be 100-;
s3, feeding the pre-stretched blank in the S2 into a spreading device for final stretching, and simultaneously carrying out gradual stretching through a secondary cloth clip to enable the pre-stretched blank to reach the preset width and thickness; the final stretching temperature of the spreading device is controlled to be more than 200 ℃; then cutting and winding the film after the expanding is finished, and finishing the production operation of the film;
wherein the tenter device used in S3 includes a base; the top of the base is provided with an expanding unit for widening pre-stretched blanks, one side of the expanding unit is fixedly connected with a pair of supporting frames, a pair of feeding rollers are rotatably connected between the supporting frames, and the feeding rollers are used for feeding the pre-stretched blanks into the expanding unit; one side of the base is rotatably connected with a material discharging roll through a support, and pre-stretched blanks released by the material discharging roll are fed between two feeding rollers; a first roller is arranged on the pre-stretched blank between the feeding roller and the discharging roll, heating oil is arranged in the first roller, and the pre-stretched blank is stretched by the first roller through self weight, so that the uneven thickness of a film finished product caused by excessive stretching for the first time is prevented; when the pre-stretched blank stretching device is used, the pre-stretched blank wound on the material placing roll is led out and then fed into a position between the feeding rollers, and the pre-stretched blank is fed into the width expanding unit to be further stretched and stretched under the driving of the feeding rollers; the first roller is placed on the pre-stretched blank between the feeding roller and the discharging roll, hot oil is introduced into the first roller, the temperature of the first roller is increased, the first roller continuously rotates and heats the pre-stretched blank when the pre-stretched blank drives the first roller to rotate, the pre-stretched blank is softened after being heated, the pre-stretched blank is elongated for the first time by the aid of the gravity of the first roller, and due to the fact that the self weight of the first roller is unchanged, the tension of the first roller on the pre-stretched blank is controlled to be unchanged, the thickness distribution of the pre-stretched blank caused by overlarge tension or uneven tension is reduced, the pre-stretched blank is difficult to compensate in a subsequent tensioning process, the pre-stretched blank is even, and the quality of a film finished product is improved.
Preferably, the periphery of the first roller is provided with an elastic conveying belt, and the inner diameter of the conveying belt is more than twice of the outer diameter of the first roller; the conveying belt is made of heat conducting materials; the heat transfer area between the first roller and the pre-stretched blank is increased through the conveying belt, so that the pre-stretched blank is prevented from being locally overheated, and the thickness uniformity of a film finished product is further increased; because the periphery of the first roller is provided with the elastic conveying belt, the inner diameter of the conveying belt is larger than the outer diameter of the twice first roller, so that the conveying belt is downwards collapsed under the action of self gravity, the contact area of the conveying belt and the pre-stretched blank is further increased, the heat of the first roller is further uniformly transmitted to the pre-stretched blank after being dispersed by the conveying belt, the pre-stretched blank is uniformly heated, the pre-stretched blank is prevented from being scalded by overheating caused by the fact that the contact area is too small when the first roller directly heats the pre-stretched blank, and the thickness uniformity of a film finished product is further increased.
Preferably, the number of the first rollers is two, triangular support plates are arranged at two ends of the first roller, a rotating shaft of the first roller is rotatably connected with the support plates, the upper parts of the support plates are rotatably connected with the second roller, and the first roller and the second roller are both arranged on the inner side of the conveying belt; a group of air plates are uniformly distributed on the periphery of the second roller, a group of vent holes are uniformly formed in the conveying belt, air is blown to the vent holes through the air plates, uniform heating of the pre-stretched blank is further increased, and thickness uniformity of a film finished product is increased; rotate through a roller and drive No. two rollers constantly rotatory, and then drive the aerofoil and constantly rotate and blast air to the conveyer belt interior week, when the air in the conveyer belt passes through the ventilation hole, the air takes away the heat on the conveyer belt of ventilation hole department, and then make the air through the ventilation hole blow to the blank that prestretches of a roller both sides after being heated, increase near the ventilation hole prestretch the preheating effect of blank, further reduce the heat and concentrate, increase the even heating of prestretching the blank, further increase film finished product thickness homogeneity.
Preferably, a group of arc-shaped protrusions are uniformly arranged on the inner periphery of the conveying belt and are used for increasing the shaking of the first roller and further increasing the stretching effect of pre-stretching the blank; a group of arc-shaped protrusions are uniformly arranged on the inner periphery of the conveying belt, so that when the protrusions move to the position of a roller along with the rotation of the conveying belt, the roller is driven to shake up and down, a roller communicating support plate continuously falls in a small range under the action of gravity, the impact force of the roller on pre-stretched blanks is increased, the repeated small-amount stretching of the roller on the pre-stretched blanks is increased, the stretching effect of the pre-stretched blanks is increased, and the thickness uniformity of finished films is increased.
Preferably, the protrusion is internally provided with a cavity which is communicated with the vent hole, and the air flow of the vent hole is further increased by extruding the cavity, so that the uniform heating of the pre-stretched blank is further increased, and the thickness uniformity of a film finished product is increased; because the cavity is formed in the protrusion and communicated with the vent hole, when the protrusion moves to the position of the first roller, the first roller extrudes the cavity, and the first roller closes one end of the vent hole close to the first roller, so that air in the cavity can be sprayed out only from one end of the vent hole far away from the first roller after being compressed, and then the high-temperature air is sprayed to the pre-tensioned blank, the heat of the conveying belt is further dispersed, the constant-speed temperature rise softening of the pre-tensioned blank is increased, and the thickness uniformity of a film finished product is further increased.
Preferably, a group of circulating pipes are circumferentially arranged in the conveying belt, heat-conducting agents are filled in the circulating pipes, the circulating pipes are extruded by a first roller to increase the flowing efficiency of the heat-conducting agents, so that the uniform heat transfer of the conveying belt is increased, the heating uniformity of pre-tensioned blanks is further increased, and the thickness uniformity of finished film products is increased; the circulating pipe is continuously extruded by the first roller, the heat conducting agent in the circulating pipe is continuously driven in one direction, so that the heat conducting agent continuously flows in the circulating pipe in a reciprocating mode, heat transmitted to the conveying belt by the first roller is uniformly dispersed to all parts of the conveying belt, the heating uniformity of the conveying belt to pre-stretched blanks is further improved, and the thickness uniformity of film finished products is improved.
The invention has the following beneficial effects:
1. the production method of the high-shrinkage polyolefin heat-shrinkable film provided by the invention comprises the steps of continuously rotating the first roller and heating the pre-stretched blank to soften the pre-stretched blank after heating, and utilizing the self gravity of the first roller to stretch the pre-stretched blank for the first time.
2. According to the production method of the high-shrinkage polyolefin heat-shrinkable film, the first roller rotates to drive the second roller to rotate continuously, the air plate is further driven to rotate continuously to blow air to the inner periphery of the conveying belt, when the air in the conveying belt passes through the vent holes, the air brings away heat on the conveying belt at the vent holes, the air passing through the vent holes is heated and then blown to the pre-stretched blanks on the two sides of the first roller, the preheating effect of the pre-stretched blanks near the vent holes is improved, heat concentration is further reduced, uniform heating of the pre-stretched blanks is improved, and the thickness uniformity of finished films is further improved.
Drawings
The invention will be further explained with reference to the drawings.
FIG. 1 is a flow chart of a method of the present invention;
FIG. 2 is a perspective view of the tenter device of the present invention;
FIG. 3 is a partial cross-sectional view of the tenter device of the present invention;
FIG. 4 is a cross-sectional view of the conveyor belt and first roller of the present invention;
FIG. 5 is an enlarged view of a portion of FIG. 4 at A;
in the figure: the device comprises a base 1, an expanding unit 11, a support frame 12, a feeding roller 13, a support 14, a feeding roll 15, a first roller 2, a conveying belt 21, a support plate 22, a second roller 23, an air plate 24, a vent hole 25, a protrusion 26, a cavity 27 and a circulating pipe 28.
Detailed Description
In order to make the technical means, the creation characteristics, the achievement purposes and the effects of the invention easy to understand, the invention is further described with the specific embodiments.
As shown in fig. 1 to 5, the method for producing a high-shrink polyolefin heat-shrinkable film according to the present invention comprises the steps of:
s1, uniformly mixing the resin, the polyurethane and the adhesive particles, drying the mixture by a drying device to enable the water content of the mixture to be lower than 0.5%, then carrying out hot melting on the mixture and extruding the mixture into a strip-shaped blank, cooling the blank in a water bath, then air-drying the blank, and winding and storing the blank;
s2, feeding the blank roll obtained in the S1 as a core layer and the master batch as a surface layer into a compound roller for heating and laminating, laminating repeatedly for three times, extruding to form a tube blank, degreasing the tube blank, cooling to room temperature, and feeding the tube blank into a stretcher for heating and stretching to form a pre-stretched blank; the heating stage is divided into three stages, the temperature is controlled to be 50-60 ℃ in the first stage, the temperature is controlled to be 100-;
s3, feeding the pre-stretched blank in the S2 into a spreading device for final stretching, and simultaneously carrying out gradual stretching through a secondary cloth clip to enable the pre-stretched blank to reach the preset width and thickness; the final stretching temperature of the spreading device is controlled to be more than 200 ℃; then cutting and winding the film after the expanding is finished, and finishing the production operation of the film;
wherein the tenter device used in S3 includes a base 1; the top of the base 1 is provided with an expanding unit 11 for widening pre-stretched blanks, one side of the expanding unit 11 is fixedly connected with a pair of support frames 12, a pair of feed rollers 13 are rotatably connected between the support frames 12, and the feed rollers 13 are used for feeding the pre-stretched blanks into the expanding unit 11; one side of the base 1 is rotatably connected with a material discharging roll 15 through a bracket 14, and pre-stretched blanks released by the material discharging roll 15 are fed between two feeding rollers 13; a first roller 2 is arranged on the pre-stretched blank between the feeding roller 13 and the discharging roll 15, heating oil is arranged inside the first roller 2, and the pre-stretched blank is stretched by the aid of dead weight of the first roller 2, so that the phenomenon that the thickness of a film finished product is uneven due to excessive stretching for the first time is avoided; when in use, the pre-stretched blank wound on the material discharge roll 15 is led out and then fed between the feeding rollers 13, and the pre-stretched blank is fed into the expanding unit 11 to be further widened and stretched under the driving of the feeding rollers 13; at the moment, the first roller 2 is placed on the pre-tensioned blank between the feeding roller 13 and the discharging roll 15, hot oil is introduced into the first roller 2, the temperature of the first roller 2 is increased, and when the pre-tensioned blank drives the first roller 2 to rotate, the first roller 2 continuously rotates and heats the pre-tensioned blank, so that the pre-tensioned blank is softened after being heated, the pre-tensioned blank is elongated for the first time by utilizing the self gravity of the first roller 2, and the tension of the first roller 2 on the pre-tensioned blank is controlled to be constant due to the constant self weight of the first roller 2, so that the uneven thickness distribution of the pre-tensioned blank caused by the overlarge tension or the uneven tension is reduced, the pre-tensioned blank is difficult to compensate in the subsequent tensioning process, the pre-tensioned blank is even, and the quality of a film finished product is improved.
As an embodiment of the invention, the first roller 2 is provided with an elastic conveying belt 21 at the periphery, and the inner diameter of the conveying belt 21 is more than twice the outer diameter of the first roller 2; the conveying belt 21 is made of heat conducting materials; the heat transfer area between the first roller 2 and the pre-stretched blank is increased through the conveying belt 21, so that the pre-stretched blank is prevented from being locally overheated, and the thickness uniformity of a film finished product is further increased; because the elastic conveying belt 21 is arranged on the periphery of the first roller 2, the inner diameter of the conveying belt 21 is larger than twice the outer diameter of the first roller 2, the conveying belt 21 is enabled to collapse downwards under the action of self gravity, the contact area of the conveying belt 21 and the pre-stretched blank is further increased, the heat of the first roller 2 is further evenly transmitted to the pre-stretched blank after being dispersed by the conveying belt 21, the pre-stretched blank is evenly heated, the pre-stretched blank is prevented from being scalded by overheating caused by the fact that the contact area is too small when the first roller 2 directly heats the pre-stretched blank, and the thickness uniformity of a finished film product is further increased.
As an embodiment of the invention, the number one roller 2 is two, triangular support plates 22 are arranged at two ends of the number one roller 2, a rotating shaft of the number one roller 2 is rotatably connected with the support plates 22, a number two roller 23 is rotatably connected to the upper parts of the support plates 22, and the number one roller 2 and the number two roller 23 are both arranged on the inner side of the conveying belt 21; a group of air plates 24 are uniformly distributed on the periphery of the second roller 23, a group of vent holes 25 are uniformly formed in the conveying belt 21, air is blown to the vent holes 25 through the air plates 24, uniform heating of pre-stretched blanks is further increased, and thickness uniformity of finished film products is increased; rotate through a roller 2 and drive No. two rollers 23 and constantly rotate, and then drive aerofoil 24 and constantly rotate and blast air to conveyer belt 21 internal circumference, when the air in the conveyer belt 21 passes through ventilation hole 25, the air takes away the heat on the conveyer belt 21 of ventilation hole 25 department, and then make the air through ventilation hole 25 blow to the blank that prestretches of a roller 2 both sides after being heated, increase the preheating effect to near ventilation hole 25 prestretching the blank, further reduce the heat and concentrate, increase the even heating of prestretching the blank, further increase film finished product thickness homogeneity.
As an embodiment of the invention, a group of arc-shaped protrusions 26 are uniformly arranged on the inner periphery of the conveyor belt 21, and the protrusions 26 are used for increasing the shaking of the first roller 2 and further increasing the stretching effect of pre-stretching the blank; a group of arc-shaped protrusions 26 are uniformly arranged on the inner periphery of the conveying belt 21, so that when the protrusions 26 move to the position of the first roller 2 along with the rotation of the conveying belt 21, the first roller 2 is driven to shake up and down, the first roller 2 is communicated with the support plate 22 and continuously falls in a small range under the action of gravity, the impact force of the first roller 2 on pre-stretched blanks is increased, the repeated small-amount stretching of the first roller 2 on the pre-stretched blanks is increased, the stretching effect of the pre-stretched blanks is increased, and the thickness uniformity of finished films is increased.
As an embodiment of the invention, a cavity 27 is formed in the protrusion 26, the cavity 27 is communicated with the vent hole 25, and the air flow of the vent hole 25 is further increased by extruding the cavity 27, so that the uniform heating of the pre-stretched blank is further increased, and the thickness uniformity of the film finished product is increased; because the cavity 27 is formed in the protrusion 26, the cavity 27 is communicated with the vent hole 25, when the protrusion 26 moves to the position of the first roller 2, the first roller 2 extrudes the cavity 27, and the first roller 2 seals one end of the vent hole 25 close to the first roller 2, so that air in the cavity 27 can be sprayed out from one end of the vent hole 25 far away from the first roller 2 after being compressed, and then the high-temperature air is sprayed to the pre-stretched blank, the heat of the conveying belt 21 is further dispersed, the constant-speed heating and softening of the pre-stretched blank are increased, and the thickness uniformity of a finished film is further increased.
As an embodiment of the invention, a group of circulating pipes 28 are arranged in the inner circumference of the conveying belt 21, heat-conducting agents are filled in the circulating pipes 28, the circulating pipes 28 are extruded by a first roller 2 to increase the flowing efficiency of the heat-conducting agents, so that the uniform heat transfer of the conveying belt 21 is increased, the heating uniformity of pre-tensioned blanks is further increased, and the thickness uniformity of finished films is increased; the first roller 2 continuously extrudes the circulating pipe 28 to continuously drive the heat conducting agent in the circulating pipe 28 to one direction, so that the heat conducting agent continuously flows back and forth in the circulating pipe 28, heat transmitted to the conveying belt 21 by the first roller 2 is uniformly dispersed to each part of the conveying belt 21, the heating uniformity of the conveying belt 21 to pre-stretched blanks is further improved, and the thickness uniformity of film finished products is improved.
When in use, the pre-stretched blank wound on the material discharge roll 15 is led out and then fed between the feeding rollers 13, and the pre-stretched blank is fed into the expanding unit 11 to be further widened and stretched under the driving of the feeding rollers 13; at the moment, the first roller 2 is placed on the pre-tensioned blank between the feeding roller 13 and the discharging roll 15, hot oil is introduced into the first roller 2, the temperature of the first roller 2 is raised, and when the pre-tensioned blank drives the first roller 2 to rotate, the first roller 2 continuously rotates and heats the pre-tensioned blank, so that the pre-tensioned blank is softened after being heated, the pre-tensioned blank is elongated for the first time by utilizing the self gravity of the first roller 2, and the tension of the first roller 2 on the pre-tensioned blank is controlled to be constant due to the constant self weight of the first roller 2, so that the uneven thickness distribution of the pre-tensioned blank caused by the overlarge tension or the uneven tension is reduced, the pre-tensioned blank is difficult to compensate in the subsequent tensioning process, and the pre-tensioned blank is even, and the quality of a film finished product is improved; the elastic conveying belt 21 is arranged on the periphery of the first roller 2, and the inner diameter of the conveying belt 21 is more than twice the outer diameter of the first roller 2, so that the conveying belt 21 is downwards collapsed under the action of self gravity, the contact area of the conveying belt 21 and the pre-stretched blank is further increased, the heat of the first roller 2 is further uniformly transmitted to the pre-stretched blank after being dispersed by the conveying belt 21, the pre-stretched blank is uniformly heated, the pre-stretched blank is prevented from being scalded by overheating caused by the fact that the contact area is too small when the first roller 2 directly heats the pre-stretched blank, and the thickness uniformity of a film finished product is further increased; the first roller 2 rotates to drive the second roller 23 to rotate continuously, so that the air plate 24 is driven to rotate continuously to blast air to the inner periphery of the conveying belt 21, when air in the conveying belt 21 passes through the vent holes 25, the air brings away heat on the conveying belt 21 at the vent holes 25, the air passing through the vent holes 25 is heated and then blown to pre-stretched blanks on two sides of the first roller 2, the preheating effect of the pre-stretched blanks near the vent holes 25 is improved, heat concentration is further reduced, uniform heating of the pre-stretched blanks is increased, and the thickness uniformity of film finished products is further improved; a group of arc-shaped protrusions 26 are uniformly arranged on the inner periphery of the conveying belt 21, so that when the protrusions 26 move to the first roller 2 along with the rotation of the conveying belt 21, the first roller 2 is driven to shake up and down, the first roller 2 is communicated with the support plate 22 and continuously falls in a small range under the action of gravity, the impact force of the first roller 2 on pre-stretched blanks is increased, the multiple small stretching of the first roller 2 on the pre-stretched blanks is increased, the stretching effect of the pre-stretched blanks is increased, and the thickness uniformity of finished films is increased; because the cavity 27 is formed in the protrusion 26, the cavity 27 is communicated with the vent hole 25, when the protrusion 26 moves to the position of the first roller 2, the first roller 2 extrudes the cavity 27, and the first roller 2 seals one end of the vent hole 25 close to the first roller 2, so that air in the cavity 27 can be sprayed out from one end of the vent hole 25 far away from the first roller 2 after being compressed, and then the high-temperature air is sprayed to the pre-stretched blank, the heat of the conveying belt 21 is further dispersed, the constant-speed heating and softening of the pre-stretched blank are increased, and the thickness uniformity of a finished film is further increased; the first roller 2 continuously extrudes the circulating pipe 28 to continuously drive the heat conducting agent in the circulating pipe 28 to one direction, so that the heat conducting agent continuously flows back and forth in the circulating pipe 28, heat transmitted to the conveying belt 21 by the first roller 2 is uniformly dispersed to each part of the conveying belt 21, the heating uniformity of the conveying belt 21 to pre-stretched blanks is further improved, and the thickness uniformity of film finished products is improved.
The front, the back, the left, the right, the upper and the lower are all based on the figure 2 in the attached drawings of the specification, according to the standard of the observation angle of a person, the side of the device facing an observer is defined as the front, the left side of the observer is defined as the left, and the like.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate orientations or positional relationships based on those shown in the drawings, and are used merely for convenience in describing the present invention and for simplifying the description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the scope of the present invention.
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 (6)
1. A production method of a high-shrinkage polyolefin heat-shrinkable film is characterized by comprising the following steps: the method comprises the following steps:
s1, uniformly mixing the resin, the polyurethane and the adhesive particles, drying the mixture by a drying device to enable the water content of the mixture to be lower than 0.5%, then carrying out hot melting on the mixture and extruding the mixture into a strip-shaped blank, cooling the blank in a water bath, then air-drying the blank, and winding and storing the blank;
s2, feeding the blank roll obtained in the S1 as a core layer and the master batch as a surface layer into a compound roller for heating and laminating, laminating repeatedly for three times, extruding to form a tube blank, degreasing the tube blank, cooling to room temperature, and feeding the tube blank into a stretcher for heating and stretching to form a pre-stretched blank; the heating stage is divided into three stages, the temperature is controlled to be 50-60 ℃ in the first stage, the temperature is controlled to be 100-;
s3, feeding the pre-stretched blank in the S2 into a spreading device for final stretching, and simultaneously carrying out gradual stretching through a secondary cloth clip to enable the pre-stretched blank to reach the preset width and thickness; the final stretching temperature of the spreading device is controlled to be more than 200 ℃; then cutting and winding the film after the expanding is finished, and finishing the production operation of the film;
wherein the spreading device used in S3 comprises a base (1); the top of the base (1) is provided with an expanding unit (11) for widening pre-stretched blanks, one side of the expanding unit (11) is fixedly connected with a pair of support frames (12), a pair of feed rollers (13) are rotatably connected between the support frames (12), and the feed rollers (13) are used for feeding the pre-stretched blanks into the expanding unit (11); one side of the base (1) is rotatably connected with a material discharging roll (15) through a support (14), and pre-stretched blanks released by the material discharging roll (15) are fed between two feeding rollers (13); the pre-stretched film is characterized in that a first roller (2) is arranged on the pre-stretched blank between the feeding roller (13) and the discharging roll (15), heating oil is arranged inside the first roller (2), and the pre-stretched blank is stretched by the aid of dead weight of the first roller (2), so that the problem that the thickness of a film finished product is uneven due to excessive stretching for the first time is solved.
2. The method for producing a high-shrink polyolefin heat-shrinkable film according to claim 1, wherein: an elastic conveying belt (21) is arranged on the periphery of the first roller (2), and the inner diameter of the conveying belt (21) is more than twice the outer diameter of the first roller (2); the conveying belt (21) is made of heat conducting materials; the heat transfer area between the first roller (2) and the pre-stretched blank is increased through the conveying belt (21), so that the pre-stretched blank is prevented from being locally overheated, and the thickness uniformity of a film finished product is further increased.
3. The method for producing a high-shrink polyolefin heat-shrinkable film according to claim 2, wherein: the two first rollers (2) are arranged, triangular support plates (22) are arranged at two ends of each first roller (2), a rotating shaft of each first roller (2) is rotatably connected with the support plates (22), the upper parts of the support plates (22) are rotatably connected with second rollers (23), and the first rollers (2) and the second rollers (23) are arranged on the inner sides of the conveying belts (21); a group of air plates (24) are uniformly distributed on the periphery of the second roller (23), a group of air holes (25) are uniformly formed in the conveying belt (21), air is blown to the air holes (25) through the air plates (24), uniform heating of pre-stretched blanks is further increased, and the thickness uniformity of film finished products is increased.
4. The method for producing a high-shrink polyolefin heat-shrinkable film according to claim 3, wherein: a group of arc-shaped protrusions (26) are uniformly arranged on the inner periphery of the conveying belt (21), and the protrusions (26) are used for increasing the shaking of the first roller (2) and further increasing the stretching effect of pre-stretched blanks.
5. The method for producing a high-shrink polyolefin heat-shrinkable film according to claim 4, wherein: cavities (27) are formed in the protrusions (26), the cavities (27) are communicated with the vent holes (25), air flow of the vent holes (25) is further increased by extruding the cavities (27), uniform heating of pre-stretched blanks is further increased, and thickness uniformity of film finished products is increased.
6. The method for producing a high-shrink polyolefin heat-shrinkable film according to claim 5, wherein: a group of circulating pipes (28) are arranged in the circumferential direction of the conveying belt (21), heat conducting agents are filled in the circulating pipes (28), the circulating pipes (28) are extruded through a first roller (2) to increase the flowing efficiency of the heat conducting agents, further the uniform heat transfer of the conveying belt (21) is increased, the heating uniformity of pre-tensioned blanks is further increased, and the thickness uniformity of film finished products is increased.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010364941.9A CN111590936A (en) | 2020-04-30 | 2020-04-30 | Production method of high-shrinkage polyolefin heat-shrinkable film |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010364941.9A CN111590936A (en) | 2020-04-30 | 2020-04-30 | Production method of high-shrinkage polyolefin heat-shrinkable film |
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| CN111590936A true CN111590936A (en) | 2020-08-28 |
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| CN202010364941.9A Withdrawn CN111590936A (en) | 2020-04-30 | 2020-04-30 | Production method of high-shrinkage polyolefin heat-shrinkable film |
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