CN113524825A - Blow molding process of multilayer co-extruded film of fluorine-containing resin for infrared hot air balloon - Google Patents

Blow molding process of multilayer co-extruded film of fluorine-containing resin for infrared hot air balloon Download PDF

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Publication number
CN113524825A
CN113524825A CN202110827465.4A CN202110827465A CN113524825A CN 113524825 A CN113524825 A CN 113524825A CN 202110827465 A CN202110827465 A CN 202110827465A CN 113524825 A CN113524825 A CN 113524825A
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film
multilayer
fluororesin
blow molding
hot air
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不公告发明人
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Tianjin Xinxing Oriental Near Space Technology Co ltd
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Tianjin Xinxing Oriental Near Space Technology Co ltd
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • 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
    • B29C48/0017—Combinations of extrusion moulding with other shaping operations combined with blow-moulding or thermoforming
    • 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
    • B29C48/0021—Combinations of extrusion moulding with other shaping operations combined with joining, lining or laminating
    • 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
    • B29C48/0022—Combinations of extrusion moulding with other shaping operations combined with cutting
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/16—Articles comprising two or more components, e.g. co-extruded layers
    • B29C48/18—Articles comprising two or more components, e.g. co-extruded layers the components being layers
    • B29C48/21—Articles comprising two or more components, e.g. co-extruded layers the components being layers the layers being joined at their surfaces
    • 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
    • B29C69/00—Combinations of shaping techniques not provided for in a single one of main groups B29C39/00 - B29C67/00, e.g. associations of moulding and joining techniques; Apparatus therefore
    • B29C69/02—Combinations of shaping techniques not provided for in a single one of main groups B29C39/00 - B29C67/00, e.g. associations of moulding and joining techniques; Apparatus therefore of moulding techniques only
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B27/08—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/18—Layered products comprising a layer of synthetic resin characterised by the use of special additives
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
    • B32B37/06—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the heating method
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
    • B32B37/10—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the pressing technique, e.g. using action of vacuum or fluid pressure
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
    • B32B37/12—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by using adhesives
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B38/00—Ancillary operations in connection with laminating processes
    • B32B38/0004—Cutting, tearing or severing, e.g. bursting; Cutter details
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
    • B32B7/04—Interconnection of layers
    • B32B7/12—Interconnection of layers using interposed adhesives or interposed materials with bonding properties
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/50—Properties of the layers or laminate having particular mechanical properties
    • B32B2307/554—Wear resistance
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/70—Other properties
    • B32B2307/71—Resistive to light or to UV
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/70—Other properties
    • B32B2307/712—Weather resistant
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/70—Other properties
    • B32B2307/714—Inert, i.e. inert to chemical degradation, corrosion
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/70—Other properties
    • B32B2307/724—Permeability to gases, adsorption
    • B32B2307/7242—Non-permeable

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Laminated Bodies (AREA)
  • Shaping By String And By Release Of Stress In Plastics And The Like (AREA)

Abstract

The invention discloses a blow molding process of a multilayer co-extruded film of fluorine-containing resin for an infrared hot air balloon. The process utilizes the blow molding biaxial stretching of the multilayer co-extrusion fluororesin to ensure that the molecular structures in the multilayer composite film are arranged in order transversely and longitudinally, thereby further improving the transverse and longitudinal mechanical properties of the composite film, the gas barrier property of the composite film, the wear resistance and the chemical stability of the composite film, and utilizing the various contrast tests, thereby testing the fluororesin film with more uniform performance, and the process is used for the test of an infrared hot air balloon.

Description

Blow molding process of multilayer co-extruded film of fluorine-containing resin for infrared hot air balloon
Technical Field
The invention relates to the technical field of infrared hot air balloons, in particular to a blow molding process of a multilayer co-extrusion film of fluorine-containing resin for an infrared hot air balloon.
Background
The existing hot air balloon is an aircraft which is lighter than air, the upper half part of the existing hot air balloon is an atmospheric sphere, the lower half part of the existing hot air balloon is a hanging basket, air is heated in the interior of the balloon, and therefore the density of the air is lower than that of cold air outside, and the air is used as buoyancy to enable the whole to displace; the gondola can carry passengers and a heat source.
In the prior art, fluorine resin, various composite films and other raw materials are mainly used for preparing key parts of a helium-resistant layer and the like of a hot-air balloon in a process, wherein the composite films can be divided into a multilayer composite film of LLDPE and special PET and the like, helium or hydrogen-resistant films and the like are prepared, so that a single layer of LLDPE or special PET is formed, and a helium-resistant principle of the multilayer or single-layer film is utilized to block gas molecules for a tortuous channel with a fine structure in the film.
However, in the actual production, there still exist some disadvantages, such as: the existing structural material of the film has poor high and low temperature aging resistance, and LLDPE has high and low temperature resistance range of about-65-110 ℃; after high and low temperature circulation, the material is aged, the mechanical property is reduced or the material property is invalid; the gas barrier property is reduced or failed, the ultraviolet aging resistance of the film is poor, and the material mechanics, heat sealing and gas barrier property are reduced or failed after ultraviolet aging.
Disclosure of Invention
Technical problem to be solved
Aiming at the defects of the prior art, the invention provides a blow molding process of a multilayer co-extrusion film of fluorine-containing resin for an infrared hot air balloon, which solves the problems that the existing film has poor ultraviolet aging resistance, and the mechanical properties, heat sealing property and gas barrier property of the material are all reduced or failed after ultraviolet aging.
(II) technical scheme
In order to achieve the purpose, the invention provides the following technical scheme: a blow molding process of a multilayer co-extrusion film of fluorine-containing resin for an infrared hot air balloon comprises the following steps:
(1) metering: the raw and auxiliary materials such as polyethylene resin, acid modified polyolefin compound and the like are manually poured into a hopper, and are automatically metered and weighed according to a certain proportion, wherein the raw and auxiliary materials can be nylon, polyethylene, acid modified polyolefin compound, fluororesin and the like, the structure of the raw and auxiliary materials is granular, the grain size of the raw and auxiliary materials is large, and dust particles cannot be generated.
(2) Screw extrusion plasticizing: heating the metered fluororesin particles by a screw extruder of a multilayer film extrusion device, shearing and plasticizing the fluororesin particles into fluid, enabling the fluid to reach a molten state, enabling the temperature to be 210-350 ℃, generating extrusion waste gas G1 in the process, and enabling the waste gas G1 to comprise molecules such as TRVOC, non-methane total hydrocarbons and ammonia, and enabling the raw materials such as the fluororesin to be in a resin particle shape.
(3) Shaping: when the fluororesin is plasticized into fluid under high-temperature melting, the fluid is subjected to blow molding longitudinal stretching by utilizing the mechanical force action of extrusion blow molding in an extruder, and is simultaneously subjected to air compression and transverse stretching by blowing, so that the fluororesin composite film forms a film when the fluid is stretched longitudinally and transversely simultaneously, and then the film is co-extruded by utilizing a plurality of extruders to extrude and extrude a plurality of layers of fluororesin films so as to extrude the fluororesin films at one machine head; after extrusion, the multilayer film is cooled by a fan in the extruder and a cooling ring of a head, and then automatically drawn, stretched, set, and wound by the extruder to produce a multilayer film, and further, a predetermined amount of titanium oxide sufficiently added to the fluororesin film forms bubble lines in the film, thereby suppressing deterioration of the fluororesin, and the film has low transmittance of ultraviolet rays having a wavelength of 360nm or less, and is excellent in heat resistance and weather resistance.
(4) Splitting, flattening and rolling: after fluororesin multilayer film is stereotyped and is extruded, utilize the multiple roll axle in the extruder to roll, with its rolling to the side cut equipment in, then level the epaxial film of roller to the side cut mesa in, utilize the side cut equipment to carry out the trimming to it, make it can equal amount cut edge, after accomplishing multilayer film side cut, utilize the flattening machine to carry out the exhibition flat rolling to the good film in trimming.
(5) And (4) checking: after the fluororesin multilayer film is shaped, cutting a part of film sample, wherein the length range of the sample is about 4m to 5m, carrying out inspection, cutting the sample into equal parts, and respectively inspecting each part of sample, wherein the inspection step is as follows; firstly, a film is taken and put in a high-temperature and low-temperature environment box for inspection, so that the temperature resistance condition of the film is observed; secondly, taking a film and testing the gas permeability of the film by a gas permeameter; thirdly, taking a film to carry out an ultraviolet aging test, testing the mechanical property of the aged film by an electronic tensile testing machine, and testing the gas permeability of the aged film by a gas permeameter; fourthly, performing mechanical test detection on the film through an electronic tensile testing machine according to standard sample preparation; fifthly, taking a film to test through a film laminating machine for experiments, and inspecting the adhesive property of the film, wherein PUR glue is adopted, after the PUR glue is melted at the temperature of not less than 80 ℃, a scraper is used for coating the film, and the film laminating machine is used for continuous lamination; sixthly, taking a film, carrying out heat sealing through a film heat sealing tester, testing the heat sealing performance of the film, folding the cut film in half, and directly carrying out heat sealing on the folded double-layer film; when in heat sealing, the pressure of the utilization equipment is not lower than 0.1MPa, and the time is not lower than 1 s.
(8) Packaging and warehousing: no waste is generated in the inspection process, and the whole roll of film is sealed and stored after the performance detection meets the relevant requirements; after inspection, the films which do not meet the relevant requirements are divided, stored and marked according to different requirements, the inspected films are classified and packaged, the films with the quality meeting the requirements and the films with the quality not meeting the requirements are respectively stuck with sample labels, and then the films meeting the relevant requirements are packaged and enter a finished product raw material area; and (3) sticking a label on the film which does not meet the relevant requirements, putting the film into a finished product raw material area for independent storage, and performing centralized and harmless treatment on waste packaging materials generated in the raw material unpacking and packaging processes.
Preferably, the cut film is heat-sealed by a strip pasting machine, and the film balloon development is carried out after the film is heat-sealed together at the temperature of 90 ℃ and the pressure of not less than 0.1MPa and the time of not less than 2 s.
Preferably, the cut composite film is connected by a special heat sealing machine, and a balloon test is performed.
Preferably, the multilayer coextruded fluororesin is subjected to blow molding biaxial stretching to ensure that the molecular structures in the multilayer composite film are orderly arranged in the transverse direction and the longitudinal direction, so that the transverse and longitudinal mechanical properties, the gas barrier property, the wear resistance and the chemical stability of the composite film are improved.
Preferably, the produced film is improved by comparing the film satisfying the requirements with the film not satisfying the requirements by performing a comparison test with the fluororesin film.
(III) advantageous effects
The invention provides a blow molding process of a multilayer co-extruded film of fluorine-containing resin for an infrared hot air balloon, which has the following beneficial effects:
the invention combines the fluororesin with other resins by adopting a customized multilayer extrusion device to prepare a multilayer co-extruded film, utilizes various devices in an extruder to carry out combined processing, such as screw extrusion plasticization, film shaping, extrusion blow molding, cooling and shaping by a fan and a cooling ring, and then flattening and rolling, thereby preparing the high-performance multilayer composite fluorine film, and utilizes the blow molding bidirectional stretching of the multilayer co-extruded fluororesin to ensure that the molecular structures in the multilayer composite film are orderly arranged in the transverse direction and the longitudinal direction, thereby further improving the transverse and longitudinal mechanical properties, the gas barrier property, the wear resistance and the chemical stability of the composite film, and utilizes the diversity comparison test to test the fluororesin film with more complete performance, is used for the test of an infrared hot balloon, and utilizes the advantages of the multilayer film structure to add quantitative vinyl compound amount, the outermost layer of the fluororesin has high-strength ageing resistance and ultraviolet resistance, so that ultraviolet rays are blocked, rapid ageing is prevented, and the fluororesin can be used as a blocking layer of an infrared hot air balloon and an adjacent space airship.
Detailed Description
All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
The invention provides a technical scheme that: a blow molding process of a multilayer co-extrusion film of fluorine-containing resin for an infrared hot air balloon comprises the following steps:
(1) metering: the raw and auxiliary materials such as polyethylene resin, acid modified polyolefin compound and the like are manually poured into a hopper, and are automatically metered and weighed according to a certain proportion, wherein the raw and auxiliary materials can be divided into nylon, polyethylene, acid modified polyolefin compound, fluororesin and the like, the structure of the raw and auxiliary materials is granular, the particle size of the raw and auxiliary materials is large, no dust particles can be generated, and the fluororesin membrane contains gas-blocking molecules.
(2) Screw extrusion plasticizing: heating the metered fluororesin particles by a screw extruder of a multilayer film extrusion device, shearing and plasticizing the fluororesin particles into fluid, enabling the fluid to reach a molten state, controlling the temperature to be 240-300 ℃, and generating extrusion waste gas G1 in the process, wherein the waste gas G1 comprises molecules such as TRVOC, non-methane total hydrocarbons and ammonia, and the raw materials such as the fluororesin are in a resin particle shape.
(3) Shaping: when the fluororesin is plasticized into fluid under high-temperature melting, the fluid is subjected to blow molding longitudinal stretching by utilizing the mechanical force action of extrusion blow molding in an extruder, and is simultaneously subjected to air compression and transverse stretching by blowing, so that the fluororesin composite film forms a film when the fluid is stretched longitudinally and transversely simultaneously, and then the film is co-extruded by utilizing a plurality of extruders to extrude and extrude a plurality of layers of fluororesin films so as to extrude the fluororesin films at one machine head; after extrusion, the multilayer film is cooled by a fan in the extruder and a cooling ring of a head, and then automatically drawn, stretched, set, and wound by the extruder to produce a multilayer film, and further, a predetermined amount of titanium oxide sufficiently added to the fluororesin film forms bubble lines in the film, thereby suppressing deterioration of the fluororesin, and the film has low transmittance of ultraviolet rays having a wavelength of 360nm or less, and is excellent in heat resistance and weather resistance.
(4) Splitting, flattening and rolling: after fluororesin multilayer film is stereotyped and is extruded, utilize the multiple roll axle in the extruder to roll, with its rolling to the side cut equipment in, then level the epaxial film of roller to the side cut mesa in, utilize the side cut equipment to carry out the trimming to it, make it can equal amount cut edge, after accomplishing multilayer film side cut, utilize the flattening machine to carry out the exhibition flat rolling to the good film in trimming.
(5) And (4) checking: after the fluororesin multilayer film is shaped, cutting a part of film sample, wherein the length range of the sample is about 4m to 5m, carrying out inspection, cutting the sample into equal parts, and respectively inspecting each part of sample, wherein the inspection step is as follows; firstly, a film is taken and put in a high-temperature and low-temperature environment box for inspection, so that the temperature resistance condition of the film is observed; secondly, taking a film and testing the gas permeability of the film by a gas permeameter; thirdly, taking a film to carry out an ultraviolet aging test, testing the mechanical property of the aged film by an electronic tensile testing machine, and testing the gas permeability of the aged film by a gas permeameter; fourthly, performing mechanical test detection on the film through an electronic tensile testing machine according to standard sample preparation; fifthly, taking a film to test through a film laminating machine for experiments, and inspecting the adhesive property of the film, wherein PUR glue is adopted, after the PUR glue is melted at the temperature of not less than 80 ℃, a scraper is used for coating the film, and the film laminating machine is used for continuous lamination; sixthly, taking a film, carrying out heat sealing through a film heat sealing tester, testing the heat sealing performance of the film, folding the cut film in half, and directly carrying out heat sealing on the folded double-layer film; when in heat sealing, the pressure of the utilization equipment is not lower than 0.1MPa, and the time is not lower than 1 s.
(8) Packaging and warehousing: no waste is generated in the inspection process, and the whole roll of film is sealed and stored after the performance detection meets the relevant requirements; after inspection, the films which do not meet the relevant requirements are divided, stored and marked according to different requirements, the inspected films are classified and packaged, the films with the quality meeting the requirements and the films with the quality not meeting the requirements are respectively stuck with sample labels, and then the films meeting the relevant requirements are packaged and enter a finished product raw material area; and (3) sticking a label on the film which does not meet the relevant requirements, putting the film into a finished product raw material area for independent storage, and performing centralized and harmless treatment on waste packaging materials generated in the raw material unpacking and packaging processes.
The cut film is heat sealed by a strip sticking machine at the temperature of not less than 90 ℃, the pressure of not less than 0.1MPa and the time of not less than 2s, the film and balloon are developed after the heat sealing, the cut multilayer composite material is connected by a special fabric sewing machine, the sewing thread part is heat sealed by a strip sticking machine, the balloon test is carried out, the molecular structure in the multilayer composite film is transversely and longitudinally arranged in order by utilizing the blow molding bidirectional stretching of multilayer co-extrusion fluororesin, so that the transverse and longitudinal mechanical property, the gas barrier property, the wear resistance and the chemical stability of the composite film are improved, the comparison and the inspection of the multilayer composite film and the fluororesin film are carried out, and the film meeting the requirements is compared with the film not meeting the requirements and is improved.
Example 2
The difference from the embodiment 1 is that: in the back end development step, the film comparison was retained by quality inspection of the fluororesin multilayer film.
20 parts of the raw material was taken and produced according to the procedure of example 1, and during the charging, 10 parts of the raw material was added to vinylidene fluoride resin which is a vinyl compound having a vinylidene fluoride monomer unit, thereby producing a multilayer film, which was used for comparative examination with the multilayer film of example 1.
Ethylene resin (%) (amount of vinyl compound in resin (g)/0.15(g)) × 100
The greater the proportion of the vinyl resin, the more intimate the adhesion between the vinyl resin-containing fluororesins is, and therefore the more excellent aging resistance and ultraviolet resistance can be obtained, preferably 35% to 70%, more preferably 55% to 70%, with specific reference to the following table:
Figure BDA0003174141580000071
in conclusion, the use of a multilayer film with a high vinyl compound content enables optimum performance to be achieved, which results in high ageing and uv resistance.
The multilayer co-extrusion film blow molding process of the fluorine-containing resin for the infrared hot air balloon is characterized in that the combination processing is carried out by various devices in an extruder, such as screw extrusion plasticization, film shaping, extrusion blow molding, cooling and shaping by a fan and a cooling ring, and then flattening and rolling are carried out, so that the high-performance multilayer composite fluorine film is prepared, and the high-performance multilayer composite fluorine film has high gas barrier property and chemical stability during production; the advantage of the multilayer film structure is utilized to add a certain amount of vinyl compound, so that the outermost layer of the fluororesin has high-strength aging resistance and ultraviolet resistance, and the ultraviolet rays are blocked to prevent rapid aging.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims (5)

1. A blow molding process of a multilayer co-extruded film of fluorine-containing resin for an infrared hot air balloon is characterized by comprising the following steps:
(1) metering: the raw and auxiliary materials such as polyethylene resin, acid modified polyolefin compound and the like are manually poured into a hopper, and are automatically metered and weighed according to a certain proportion, wherein the raw and auxiliary materials can be nylon, polyethylene, acid modified polyolefin compound, fluororesin and the like, the structure of the raw and auxiliary materials is granular, the grain size of the raw and auxiliary materials is large, and dust particles cannot be generated.
(2) Screw extrusion plasticizing: heating the metered fluororesin particles by a screw extruder of a multilayer film extrusion device, shearing and plasticizing the fluororesin particles into fluid, enabling the fluid to reach a molten state, enabling the temperature to be 210-310 ℃, and generating extrusion waste gas G1 in the process, wherein the waste gas G1 comprises molecules such as TRVOC, non-methane total hydrocarbons and ammonia, and the raw materials such as the fluororesin are in a resin particle shape.
(3) Shaping: when the fluororesin is plasticized into fluid under high-temperature melting, the fluid is subjected to blow molding longitudinal stretching by utilizing the mechanical force action of extrusion blow molding in an extruder, and is simultaneously subjected to air compression and transverse stretching by blowing, so that the fluororesin composite film forms a film when the fluid is stretched longitudinally and transversely simultaneously, and then the film is co-extruded by utilizing a plurality of extruders to extrude and extrude a plurality of layers of fluororesin films so as to extrude the fluororesin films at one machine head; after extrusion, the multilayer film is cooled by a fan in the extruder and a cooling ring of a head, and then automatically drawn, stretched, set, and wound by the extruder to produce a multilayer film, and further, a predetermined amount of titanium oxide sufficiently added to the fluororesin film forms bubble lines in the film, thereby suppressing deterioration of the fluororesin, and the film has low transmittance of ultraviolet rays having a wavelength of 360nm or less, and is excellent in heat resistance and weather resistance.
(4) Splitting, flattening and rolling: after fluororesin multilayer film is stereotyped and is extruded, utilize the multiple roll axle in the extruder to roll, with its rolling to the side cut equipment in, then level the epaxial film of roller to the side cut mesa in, utilize the side cut equipment to carry out the trimming to it, make it can equal amount cut edge, after accomplishing multilayer film side cut, utilize the flattening machine to carry out the exhibition flat rolling to the good film in trimming.
(5) And (4) checking: after the fluororesin multilayer film is shaped, cutting a part of film sample, wherein the length range of the sample is about 4m to 5m, carrying out inspection, cutting the sample into equal parts, and respectively inspecting each part of sample, wherein the inspection step is as follows; firstly, a film is taken and put in a high-temperature and low-temperature environment box for inspection, so that the temperature resistance condition of the film is observed; secondly, taking a film and testing the gas permeability of the film by a gas permeameter; thirdly, taking a film to carry out an ultraviolet aging test, testing the mechanical property of the aged film by an electronic tensile testing machine, and testing the gas permeability of the aged film by a gas permeameter; fourthly, performing mechanical test detection on the film through an electronic tensile testing machine according to standard sample preparation; fifthly, taking a film, testing the film by a film laminating machine for experiments, and inspecting the adhesive property of the film, wherein PUR glue is adopted, is melted at 80 ℃, is coated on the film by a scraper, and is continuously pressed by the film laminating machine; sixthly, taking a film, carrying out heat sealing through a film heat sealing tester, testing the heat sealing performance of the film, folding the cut film in half, and directly carrying out heat sealing on the folded double-layer film; when in heat sealing, the pressure of the utilization equipment is not lower than 0.1MPa, and the time is not lower than 1 s.
(8) Packaging and warehousing: no waste is generated in the inspection process, and the whole roll of film is sealed and stored after the performance detection meets the relevant requirements; after inspection, the films which do not meet the relevant requirements are divided, stored and marked according to different requirements, the inspected films are classified and packaged, the films with the quality meeting the requirements and the films with the quality not meeting the requirements are respectively stuck with sample labels, and then the films meeting the relevant requirements are packaged and enter a finished product raw material area; and (3) sticking a label on the film which does not meet the relevant requirements, putting the film into a finished product raw material area for independent storage, and performing centralized and harmless treatment on waste packaging materials generated in the raw material unpacking and packaging processes.
2. The blow molding process of the multilayer co-extruded film of the fluorine-containing resin for the infrared hot air balloon as claimed in claim 1, wherein: and (3) carrying out heat sealing on the cut film by using a strip sticking machine, and carrying out heat sealing on the film and the balloon at the temperature of not less than 90 ℃, the pressure of not less than 0.1MPa and the time of not less than 2 s.
3. The blow molding process of the multilayer co-extruded film of the fluorine-containing resin for the infrared hot air balloon as claimed in claim 1, wherein: the cut film was heat-sealed and bonded by a heat sealer (continuous type or discontinuous type) to form a sphere, and a balloon test was performed.
4. The blow molding process of the multilayer co-extruded film of the fluorine-containing resin for the infrared hot air balloon as claimed in claim 1, wherein: the molecular structures in the multilayer composite film are orderly arranged in the transverse direction and the longitudinal direction by utilizing the blow molding biaxial stretching of the multilayer co-extrusion fluororesin, so that the transverse and longitudinal mechanical properties, the gas barrier property, the wear resistance and the chemical stability of the composite film are improved.
5. The blow molding process of the multilayer co-extruded film of the fluorine-containing resin for the infrared hot air balloon as claimed in claim 1, wherein: the produced film is compared with a fluororesin film for inspection, and the film meeting the requirements is compared with the film not meeting the requirements for improvement.
CN202110827465.4A 2021-07-21 2021-07-21 Blow molding process of multilayer co-extruded film of fluorine-containing resin for infrared hot air balloon Withdrawn CN113524825A (en)

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CN106590456A (en) * 2016-11-24 2017-04-26 浙江歌瑞新材料有限公司 Fluorine-containing functional weather-proofing film and preparation technology thereof
CN107603086A (en) * 2017-08-04 2018-01-19 成都兆丰斯诺科技有限公司 A kind of preparation method of macromolecule multiple field waterproofing membrane
CN207825651U (en) * 2017-11-15 2018-09-07 东莞前沿技术研究院 Polyethylene film and aerostat

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102001486A (en) * 2009-08-28 2011-04-06 翁文桂 Barrier-property lapped polymer film packaging material
CN106541656A (en) * 2016-09-19 2017-03-29 浙江凯阳新材料股份有限公司 It is a kind of it is three-layer co-extruded go out polyvinylidene difluoride film and preparation method thereof
CN106590456A (en) * 2016-11-24 2017-04-26 浙江歌瑞新材料有限公司 Fluorine-containing functional weather-proofing film and preparation technology thereof
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Application publication date: 20211022