CN115008798A - Preparation system and method of tape-casting CPE film - Google Patents

Preparation system and method of tape-casting CPE film Download PDF

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Publication number
CN115008798A
CN115008798A CN202210595049.0A CN202210595049A CN115008798A CN 115008798 A CN115008798 A CN 115008798A CN 202210595049 A CN202210595049 A CN 202210595049A CN 115008798 A CN115008798 A CN 115008798A
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China
Prior art keywords
casting
cpe
film
cpe film
thickness
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CN202210595049.0A
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Chinese (zh)
Inventor
陈渊
王广
庄超
张国强
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Sichuan Houcheng New Material Co ltd
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Sichuan Houcheng New Material Co ltd
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Priority to CN202210595049.0A priority Critical patent/CN115008798A/en
Publication of CN115008798A publication Critical patent/CN115008798A/en
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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
    • B29D7/00—Producing flat articles, e.g. films or sheets
    • B29D7/01—Films or sheets
    • 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
    • B29C41/00—Shaping by coating a mould, core or other substrate, i.e. by depositing material and stripping-off the shaped article; Apparatus therefor
    • B29C41/24—Shaping by coating a mould, core or other substrate, i.e. by depositing material and stripping-off the shaped article; Apparatus therefor for making articles of indefinite length
    • B29C41/26—Shaping by coating a mould, core or other substrate, i.e. by depositing material and stripping-off the shaped article; Apparatus therefor for making articles of indefinite length by depositing flowable material on a rotating drum
    • 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
    • B29C41/00—Shaping by coating a mould, core or other substrate, i.e. by depositing material and stripping-off the shaped article; Apparatus therefor
    • B29C41/34—Component parts, details or accessories; Auxiliary operations
    • B29C41/52—Measuring, controlling or regulating
    • 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
    • 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
    • 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
    • B29C71/00—After-treatment of articles without altering their shape; Apparatus therefor
    • B29C71/04—After-treatment of articles without altering their shape; Apparatus therefor by wave energy or particle radiation, e.g. for curing or vulcanising preformed articles
    • 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
    • B29K2027/00—Use of polyvinylhalogenides or derivatives thereof as moulding material

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Extrusion Moulding Of Plastics Or The Like (AREA)

Abstract

The invention discloses a preparation system and a preparation method of a casting CPE film, wherein the preparation system of the casting CPE film comprises an extruder, a forming roller, a stripping roller, a thickness gauge, an extrusion traction roller, a cooling air knife, an edge cutting device, a corona treatment device and a winding device which are sequentially arranged: the preparation method comprises the following steps: steps S1-S4. The invention ensures that the hot casting CPE film raw material is fully molded on the molding roller, ensures good molding effect, is not easy to deform in the later period of the casting CPE film, has good flattening degree, increases the stiffness, hardness and false thickness of the casting CPE film, and can further improve the quality of the casting CPE film. In the back corona process, the influence of temperature and thickness on the corona effect is fully considered, excessive corona is avoided, the curtain coating CPE film absorbs excessive dust in the air, or the corona is insufficient, and the corona quality is reduced.

Description

Preparation system and method of tape-casting CPE film
Technical Field
The invention relates to the technical field of medical instruments, in particular to a therapeutic apparatus for treating human body scars.
Background
Cast films are a non-stretched, non-oriented cast film produced by melt cast quenching. The method has two modes of single-layer casting and multi-layer coextrusion casting. Compared with blown film, the method has the characteristics of high production speed, high yield, excellent transparency, gloss, thickness uniformity and the like of the film.
With the continuous development of economy and the continuous progress of society, various material consumption products are provided for the production and the life of people. As is well known, for the packaging of various materials such as particles, electronic products, silica gel, earcaps, etc., without the use of a package, a cast CPE (chlorinated polyethylene) film is a common material for packaging bags of various materials such as particles, electronic products, silica gel, earcaps, etc.
In the production process of the casting CPE film, each production link needs to be accurately controlled to ensure the uniformity of the surface of the produced casting CPE film, and the casting CPE film produced by the prior art has uneven surface, poor quality and can not adapt to high-requirement application.
Disclosure of Invention
In view of the above-mentioned deficiencies in the prior art, the present invention provides a cast CPE film manufacturing system and method that can effectively increase the uniformity of the produced cast CPE film.
In order to achieve the purpose of the invention, the technical scheme adopted by the invention is as follows:
the utility model provides a preparation system of curtain coating CPE membrane, it is including extruder, forming roll, peel roller, calibrator, extrusion carry over pinch rolls, cooling air knife, side cut device, corona treatment device and the coiling mechanism that sets gradually:
extruding a casting CPE film raw material by a machine head of an extruder, forming a hot casting CPE film on a forming roller, and arranging a cooling system in the forming roller;
the forming roll cools off hot curtain coating CPE film, and the pad pasting air knife blows compressed gas on to the forming roll, makes hot curtain coating CPE film hug closely the forming roll surface:
the stripping roller is used for stripping the formed casting CPE film from the stripping roller and transmitting the casting CPE film to the thickness meter, and the thickness meter is used for measuring the thickness of the casting CPE film;
the extrusion drawing rollers extrude and draw the ultra-thick casting CPE film to a set thickness by adjusting the gap which can pass between the extrusion drawing rollers;
the edge cutting device is used for cutting off the ultra-thick edge of the casting CPE film; the corona treatment device is used for carrying out corona treatment on the casting CPE film to increase the adhesiveness of the casting CPE film;
the winding device is used for winding the tape-casting CPE film after electric shock treatment in order.
Further, the device also comprises a temperature sensor, wherein the temperature sensor is arranged between the extrusion traction roller and the cooling air knife, between the cooling air knife and the corona treatment device and is used for detecting the temperature of the casting CPE film.
Further, a distance sensor is included for detecting a gap formed between the pinch pull rolls.
There is provided a method of manufacturing a cast CPE film using the above-described cast CPE film manufacturing system, comprising the steps of:
s1: extruding a casting CPE film raw material by a machine head of an extruder, forming a hot casting CPE film on a forming roller, and applying pressure to the hot casting CPE film by a film attaching air knife beside the forming roller by using compressed hot air so that the hot casting CPE film is quickly formed into a film on the forming roller and is uniformly distributed; forming a casting CPE film after the hot casting CPE film is cooled by a forming roller, and keeping the surface of the forming roller at a set temperature by a cooling system in the forming roller;
s2: stripping the formed casting CPE film from the forming roller through a stripping roller, then drawing the casting CPE film to a thickness meter, measuring the thickness H of the casting CPE film at the moment by using the thickness meter, and marking the position exceeding the thickness;
s3: adjusting the gap A between the extrusion traction rollers to be the thickness H, and carrying out traction and stretching on the excessively thick casting CPE film to ensure that each position of the casting CPE film can reach the uniform thickness H;
s4: conveying the cast CPE film after the drawing and stretching is finished to a cooling air knife, detecting the temperature T of the cast CPE film output by an extrusion drawing roller by a temperature sensor, controlling the cooling air knife to blow cold air with the air pressure intensity of P according to the temperature T, and cooling the cast CPE film; wherein P is less than or equal to (F) 0 -kT)/s，F 0 The tensile limit of the standard casting CPE film is defined, k is the tensile influence coefficient of the casting CPE film by the temperature, and s is the pressed area of the gas blown out by the cooling air knife on the casting CPE film;
s5: edge cutting device excision curtain coating CPE membrane after the cooling border deckle edge to utilize corona treatment device to carry out corona treatment to curtain coating CPE membrane surface, increase the adhesion on curtain coating CPE membrane surface, the rolling is accomplished to rethread coiling mechanism.
Further, step S2 includes:
s21: stripping the formed casting CPE film from the forming roller through a stripping roller, and then drawing the casting CPE film to a thickness gauge;
s22: drawing the casting CPE film into a thickness gauge, and obliquely drawing the casting CPE film from one end of the thickness gauge to the other end;
s23: placing a horizontal standard transparent film below the inclined casting CPE film, and forming a triangular air gap between the standard transparent film and the casting CPE film;
s24: utilizing a light source to irradiate the cast CPE film and the standard transparent film, and obtaining N interference fringes under the action of a triangular air gap;
s25: measuring the width D of the interference fringe and the bending distance a of the interference fringe, and calculating the thickness D of the casting CPE film at the position corresponding to the fringe by using the distance D and the bending distance a:
Figure BDA0003667835670000031
wherein λ is the wavelength of light;
s26: calculating the casting CPE film thickness D corresponding to each interference fringe, and calculating and averaging to obtain the average thickness D' of the casting CPE film:
D′＝(D 1 +D 2 +…+D N )/N；
s27: the average thickness D' was taken as the last measured thickness H and the gap a between the squeeze rolls was adjusted to H.
Further, the corona treatment device is used for carrying out corona treatment on the surface of the casting CPE film, and the method comprises the following steps:
s51: a temperature sensor arranged between the cooling air knife and the corona treatment device is used for acquiring the temperature t of the casting CPE film cooled by the cooling air knife;
s52: judging the temperature t, and if t is more than or equal to t', executing the next step; otherwise, the corona device heats the casting CPE film to t', and then executes the next step;
when the temperature of the casting CPE film is high, the corona treatment effect is good, because when the temperature is high, the chemical reaction speed is high, and the reaction degree is large. Thus, corona treatment is required to work best at certain temperatures of the film.
S53: temperature t at this point with cast CPE film 1 And thickness H, calculating power P of the corona treatment device during corona:
Figure BDA0003667835670000041
wherein k is 1 As the coefficient of influence of temperature on the corona effect, k 2 Is the coefficient of influence of the thickness of the cast CPE film on the corona effect, P 1 Is the rated power of the corona treatment device.
The invention has the beneficial effects that: the invention ensures that the hot casting CPE film raw material is formed on the circumference of the forming roller for a long time, so that the hot casting CPE film raw material is fully formed on the forming roller, the good forming effect is ensured, the forming roller and the stripping roller are used for drawing the hot casting CPE film, the longitudinal stretching effect is exerted on the CPE film, the molecular structure of the casting film is changed, the internal stress inside the casting film is reduced, the thickness measurement is carried out through the thickness meter, the second plasticizing is carried out on the uneven part through extruding the drawing roller, the crystallization time is prolonged, the casting CPE film is not easy to deform in the later period, the flattening degree is good, and the stiffness, the hardness and the false thickness of the casting CPE film are increased.
Simultaneously, when carrying out curtain coating CPE cooling, the intensity of accurate control blowing avoids appearing warping because too strong atmospheric pressure makes hot curtain coating CPE membrane to when thickness measurement, utilize the interference effect of inhomogeneous curtain coating CPE membrane position to the light, and then detect out accurate average thickness, the rethread sets up accurate interval to the extrusion carry over pinch rolls, carries out the flattening with inhomogeneous position, further promotes the quality of curtain coating CPE membrane. In the back corona process, the influence of temperature and thickness on the corona effect is fully considered, excessive corona is avoided, the curtain coating CPE film absorbs excessive dust in the air, or the corona is insufficient, and the corona quality is reduced.
Drawings
Fig. 1 is a block diagram of a production system for casting CPE films.
Detailed Description
The following description of the embodiments of the present invention is provided to facilitate the understanding of the present invention by those skilled in the art, but it should be understood that the present invention is not limited to the scope of the embodiments, and it will be apparent to those skilled in the art that various changes may be made without departing from the spirit and scope of the invention as defined and defined in the appended claims, and all matters produced by the invention using the inventive concept are protected.
As shown in fig. 1, the preparation system of curtain coating CPE film of this scheme is including the extruder, the forming roll, peel roller, calibrator, extrusion carry over pinch rolls, cooling air knife, side cut device, corona treatment device and the coiling mechanism that set gradually:
extruding a casting CPE film raw material by a machine head of an extruder, forming a hot casting CPE film on a forming roller, and arranging a cooling system in the forming roller;
the forming roll cools off hot curtain coating CPE film, and the pad pasting air knife blows compressed gas on to the forming roll, makes hot curtain coating CPE film hug closely the forming roll surface:
the stripping roller is used for stripping the formed casting CPE film from the stripping roller and transmitting the casting CPE film to the thickness meter, and the thickness meter is used for measuring the thickness of the casting CPE film;
the extrusion drawing rollers extrude and draw the ultra-thick casting CPE film to a set thickness by adjusting the gap which can pass between the extrusion drawing rollers;
the edge cutting device is used for cutting off the ultra-thick edge of the casting CPE film; the corona treatment device is used for carrying out corona treatment on the casting CPE film to increase the adhesiveness of the casting CPE film;
the winding device is used for winding the tape-casting CPE film after electric shock treatment in order.
In this embodiment, the apparatus further comprises a temperature sensor, wherein the temperature sensor is arranged between the extrusion pulling roll and the cooling air knife, between the cooling air knife and the corona treatment device, and is used for detecting the temperature of the casting CPE film. The device also comprises a distance sensor, and the distance sensor is used for detecting a gap formed between the extrusion drawing rollers.
The method for preparing the casting CPE film by using the preparation system of the casting CPE film comprises the following steps:
s1: extruding a casting CPE film raw material by a machine head of an extruder, forming a hot casting CPE film on a forming roller, and applying pressure to the hot casting CPE film by a film attaching air knife beside the forming roller by using compressed hot air so that the hot casting CPE film is quickly formed into a film on the forming roller and is uniformly distributed; forming a casting CPE film after the hot casting CPE film is cooled by a forming roller, and keeping the surface of the forming roller at a set temperature by a cooling system in the forming roller;
s2: stripping the formed casting CPE film from the forming roller through a stripping roller, then drawing the casting CPE film to a thickness meter, measuring the thickness H of the casting CPE film at the moment by using the thickness meter, and marking the position exceeding the thickness; the method comprises the following steps:
s21: stripping the formed casting CPE film from the forming roller through a stripping roller, and then drawing the casting CPE film to a thickness gauge;
s22: drawing the casting CPE film into a thickness gauge, and obliquely drawing the casting CPE film from one end of the thickness gauge to the other end;
s23: placing a horizontal standard transparent film below the inclined casting CPE film, and forming a triangular air gap between the standard transparent film and the casting CPE film;
s24: irradiating the cast CPE film and the standard transparent film by using a light source, and obtaining N interference fringes by the light source through the action of a triangular air gap between the cast CPE film and the standard transparent film;
s25: measuring the width D of the interference fringe and the bending distance a of the interference fringe, and calculating the thickness D of the casting CPE film at the position corresponding to the fringe by using the distance D and the bending distance a:
Figure BDA0003667835670000071
wherein λ is the wavelength of light;
s26: calculating the casting CPE film thickness D corresponding to each interference fringe, and calculating and averaging to obtain the average thickness D' of the casting CPE film:
D′＝(D 1 +D 2 +…+D N )/N；
s27: the average thickness D' was taken as the final measured thickness H and the gap a between the press rolls was adjusted to H.
S3: adjusting the gap A between the extrusion traction rollers to be the thickness H, and carrying out traction and stretching on the excessively thick casting CPE film to ensure that each position of the casting CPE film can reach the uniform thickness H;
s4: conveying the cast CPE film after the drawing and stretching is finished to a cooling air knife, detecting the temperature T of the cast CPE film output by an extrusion drawing roller by a temperature sensor, controlling the cooling air knife to blow cold air with the air pressure intensity of P according to the temperature T, and cooling the cast CPE film; wherein P is less than or equal to (F) 0 -kT)/s，F 0 The tensile limit of the standard casting CPE film is defined, k is the tensile influence coefficient of the casting CPE film caused by temperature, and s is the pressed area of the gas blown out by the cooling air knife on the casting CPE film;
s5: edge cutting device excision curtain coating CPE membrane after the cooling border deckle edge to utilize corona treatment device to carry out corona treatment to curtain coating CPE membrane surface, increase the adhesion on curtain coating CPE membrane surface, the rolling is accomplished to rethread coiling mechanism.
The method for carrying out corona treatment on the surface of the casting CPE film by the corona treatment device comprises the following steps:
s51: a temperature sensor arranged between the cooling air knife and the corona treatment device is used for acquiring the temperature t of the casting CPE film cooled by the cooling air knife;
s52: judging the temperature t, and if t is more than or equal to t', executing the next step; otherwise, the corona device heats the casting CPE film to t', and then executes the next step;
s53: temperature t at this point with cast CPE film 1 And thickness H, calculating power P of the corona treatment device during corona:
Figure BDA0003667835670000081
wherein k is 1 As the coefficient of influence of temperature on the corona effect, k 2 Is the coefficient of influence of the thickness of the cast CPE film on the corona effect, P 1 Is the rated power of the corona treatment device.
The invention ensures that the hot casting CPE film raw material is formed on the circumference of the forming roller for a long time, so that the hot casting CPE film raw material is fully formed on the forming roller, the good forming effect is ensured, the forming roller and the stripping roller are used for drawing the hot casting CPE film, the longitudinal stretching effect is exerted on the CPE film, the molecular structure of the casting film is changed, the internal stress inside the casting film is reduced, the thickness measurement is carried out through the thickness meter, the second plasticizing is carried out on the uneven part through extruding the drawing roller, the crystallization time is prolonged, the casting CPE film is not easy to deform in the later period, the flattening degree is good, and the stiffness, the hardness and the false thickness of the casting CPE film are increased.
Simultaneously, when carrying out curtain coating CPE cooling, the intensity of accurate control blowing avoids appearing warping because too strong atmospheric pressure makes hot curtain coating CPE membrane to when thickness measurement, utilize the interference effect of inhomogeneous curtain coating CPE membrane position to the light, and then detect out accurate average thickness, the rethread sets up accurate interval to the extrusion carry over pinch rolls, carries out the flattening with inhomogeneous position, further promotes the quality of curtain coating CPE membrane. In the later corona process, the influence of temperature and thickness on corona effect is fully considered, excessive corona is avoided, the curtain coating CPE film absorbs excessive dust in the air, or the corona is insufficient, and the corona quality is reduced.
While there have been shown and described what are at present considered to be the basic principles and essential features of the invention and advantages thereof, it will be apparent to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, but is capable of other specific forms without departing from the spirit or essential characteristics thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.

Claims (6)

1. The utility model provides a preparation system of curtain coating CPE membrane which characterized in that, includes extruder, forming roll, peel roller, calibrator, extrusion carry over pinch rolls, cooling air knife, side cut device, corona treatment device and the coiling mechanism that sets gradually:
extruding a casting CPE film raw material by a machine head of the extruder, forming a hot casting CPE film on a forming roller, wherein a cooling system is arranged in the forming roller;
the forming roller cools the hot casting CPE film, and the film pasting air knife blows compressed gas to the forming roller to enable the hot casting CPE film to be tightly attached to the surface of the forming roller:
the stripping roller is used for stripping the formed casting CPE film from the stripping roller and transmitting the casting CPE film to a thickness gauge, and the thickness gauge is used for measuring the thickness of the casting CPE film;
the extrusion drawing rollers extrude and draw the ultra-thick casting CPE film to a set thickness by adjusting the gap which can pass between the extrusion drawing rollers;
the edge cutting device is used for cutting off the ultra-thick edge of the casting CPE film; the corona treatment device is used for carrying out corona treatment on the casting CPE film and increasing the adhesiveness of the casting CPE film;
the winding device is used for winding the tape-casting CPE film after electric shock treatment in order.
2. The system of claim 1, further comprising a temperature sensor disposed between the squeeze pull roll and the cooling air knife, and the corona treatment device for detecting a temperature of the cast CPE film.
3. The cast CPE film production system of claim 1, further comprising a distance sensor to detect a gap formed between the pinch pull rolls.
4. A method for preparing the casting CPE film by using the preparation system of the casting CPE film is characterized by comprising the following steps:
s1: extruding a casting CPE film raw material by a machine head of an extruder, forming a hot casting CPE film on a forming roller, and applying pressure to the hot casting CPE film by a film attaching air knife beside the forming roller by using compressed hot air so that the hot casting CPE film is quickly formed into a film on the forming roller and is uniformly distributed; forming a casting CPE film after the hot casting CPE film is cooled by a forming roller, and keeping the surface of the forming roller at a set temperature by a cooling system in the forming roller;
s2: stripping the formed casting CPE film from the forming roller through a stripping roller, then drawing the casting CPE film to a thickness meter, measuring the thickness H of the casting CPE film at the moment by using the thickness meter, and marking the position exceeding the thickness;
s3: adjusting the gap A between the extrusion traction rollers to be the thickness H, and carrying out traction and stretching on the excessively thick casting CPE film to ensure that each position of the casting CPE film can reach the uniform thickness H;
s4: transfer of the cast CPE film after completion of the draw and stretch to coldThe temperature sensor detects the temperature T of the casting CPE film output by the extrusion traction roller, and the cooling air knife is controlled to blow cold air with the air pressure intensity of P according to the temperature T so as to cool the casting CPE film; wherein P is less than or equal to (F) 0 -kT)/s，F 0 The tensile limit of the standard casting CPE film is defined, k is the tensile influence coefficient of the casting CPE film caused by temperature, and s is the pressed area of the gas blown out by the cooling air knife on the casting CPE film;
s5: edge cutting device excision curtain coating CPE membrane after the cooling border deckle edge to utilize corona treatment device to carry out corona treatment to curtain coating CPE membrane surface, increase the adhesion on curtain coating CPE membrane surface, the rolling is accomplished to rethread coiling mechanism.
5. The method of making a cast CPE film in accordance with the cast CPE film making system of claim 4, wherein said step S2 comprises:
s21: stripping the formed casting CPE film from the forming roller through a stripping roller, and then drawing the casting CPE film to a thickness gauge;
s22: drawing the casting CPE film into a thickness gauge, and obliquely drawing the casting CPE film from one end of the thickness gauge to the other end;
s23: placing a horizontal standard transparent film below the inclined casting CPE film, and forming a triangular air gap between the standard transparent film and the casting CPE film;
s24: utilizing a light source to irradiate the cast CPE film and the standard transparent film, and obtaining N interference fringes under the action of a triangular air gap;
s25: measuring the width D of the interference fringe and the bending distance a of the interference fringe, and calculating the thickness D of the casting CPE film at the position corresponding to the fringe by using the distance D and the bending distance a:
Figure FDA0003667835660000031
wherein λ is the wavelength of light;
s26: calculating the casting CPE film thickness D corresponding to each interference fringe, and calculating and averaging to obtain the average thickness D' of the casting CPE film:
D′＝(D 1 +D 2 +…+D N )/N；
s27: the average thickness D' was taken as the final measured thickness H and the gap a between the press rolls was adjusted to H.
6. The cast CPE film preparation system according to claim 4, wherein the corona treatment device is used for carrying out corona treatment on the surface of the cast CPE film by the following method:
s51: a temperature sensor arranged between the cooling air knife and the corona treatment device is used for acquiring the temperature t of the casting CPE film cooled by the cooling air knife;
s52: judging the temperature t, and if t is more than or equal to t', executing the next step; otherwise, the corona device heats the casting CPE film to t', and then executes the next step;
s53: temperature t at this point with cast CPE film 1 And thickness H, calculating power P of the corona treatment device during corona:
Figure FDA0003667835660000032
wherein k is 1 As the coefficient of influence of temperature on the corona effect, k 2 Is the coefficient of influence of the thickness of the cast CPE film on the corona effect, P 1 Is the rated power of the corona treatment device.
CN202210595049.0A 2022-05-29 2022-05-29 Preparation system and method of tape-casting CPE film Pending CN115008798A (en)

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* Cited by examiner, † Cited by third party
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CN115302678A (en) * 2022-10-12 2022-11-08 南通博亿峰都新材料科技有限公司 Method for controlling casting technological parameters of packaging material for plastic molding

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115302678A (en) * 2022-10-12 2022-11-08 南通博亿峰都新材料科技有限公司 Method for controlling casting technological parameters of packaging material for plastic molding

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