CN117261397A - Shrinkage force controllable composite heat shrinkage film, production process and shrinkage force control method - Google Patents
Shrinkage force controllable composite heat shrinkage film, production process and shrinkage force control method Download PDFInfo
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- CN117261397A CN117261397A CN202311552207.5A CN202311552207A CN117261397A CN 117261397 A CN117261397 A CN 117261397A CN 202311552207 A CN202311552207 A CN 202311552207A CN 117261397 A CN117261397 A CN 117261397A
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- 238000004519 manufacturing process Methods 0.000 title claims abstract description 72
- 238000000034 method Methods 0.000 title claims abstract description 39
- 229920006257 Heat-shrinkable film Polymers 0.000 claims abstract description 152
- 229920005644 polyethylene terephthalate glycol copolymer Polymers 0.000 claims abstract description 72
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- -1 polyethylene terephthalate-1, 4-cyclohexanedimethanol Polymers 0.000 claims description 21
- 239000003795 chemical substances by application Substances 0.000 claims description 18
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical group O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 16
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- NLYAJNPCOHFWQQ-UHFFFAOYSA-N kaolin Chemical compound O.O.O=[Al]O[Si](=O)O[Si](=O)O[Al]=O NLYAJNPCOHFWQQ-UHFFFAOYSA-N 0.000 claims description 2
- 229910052744 lithium Inorganic materials 0.000 claims description 2
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Classifications
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- B32—LAYERED PRODUCTS
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- 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
- B29C37/00—Component parts, details, accessories or auxiliary operations, not covered by group B29C33/00 or B29C35/00
- B29C37/02—Deburring or deflashing
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/001—Combinations of extrusion moulding with other shaping operations
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- 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
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- B29C48/08—Flat, e.g. panels flexible, e.g. films
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- 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
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- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/25—Component parts, details or accessories; Auxiliary operations
- B29C48/28—Storing of extruded material, e.g. by winding up or stacking
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/25—Component parts, details or accessories; Auxiliary operations
- B29C48/92—Measuring, controlling or regulating
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- 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
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- B32B27/18—Layered products comprising a layer of synthetic resin characterised by the use of special additives
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- B32B27/302—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers comprising aromatic vinyl (co)polymers, e.g. styrenic (co)polymers
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- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
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- G—PHYSICS
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- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L5/00—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes
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- B32B2307/30—Properties of the layers or laminate having particular thermal properties
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- C—CHEMISTRY; METALLURGY
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- C08J2325/00—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by an aromatic carbocyclic ring; Derivatives of such polymers
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Physics & Mathematics (AREA)
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- Thermal Sciences (AREA)
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- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
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- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Shaping By String And By Release Of Stress In Plastics And The Like (AREA)
- Laminated Bodies (AREA)
Abstract
The invention discloses a shrinkage force controllable composite heat-shrinkable film, a production process and a shrinkage force control method; the composite heat-shrinkable film comprises a three-layer composite structure, wherein the surface film layers are PETG, the core film layer is a mixture of PETG, PS, K resin, and the composite heat-shrinkable film has the advantages of simple material components and low production cost; the PS component in the core film layer reduces the shrinkage force of the composite heat shrinkage film and solves the problem of high heat shrinkage force; the PETG component in the core film layer improves the binding force between the core film layer and the surface film layer material, and solves the film layer separation and film surface wrinkling phenomenon after heat shrinkage; the composite heat-shrinkable film is prepared by the existing multilayer coextrusion biaxial stretching production line, an on-line measuring device for the shrinkage force is arranged on the side edge of the winding device, the thickness proportion of the surface film layer and the core film layer of the heat-shrinkable film is controlled in a feedback manner by detecting the relative shrinkage force of the heat-shrinkable film on line, on-line control and on-line adjustment of the shrinkage force of a heat-shrinkable film finished product are realized, and the technical problem of on-line control and adjustment of the shrinkage force of the heat-shrinkable film is solved.
Description
Technical Field
The invention relates to the technical field of composite heat-shrinkable films, production processes and on-line control of heat-shrinkable force, in particular to a shrinkage-force-controllable composite heat-shrinkable film, a production process and a shrinkage force control method.
Background
The existing PETG heat-shrinkable film gradually replaces the PVC heat-shrinkable film due to the characteristics of high surface glossiness, good printing performance, high shrinkage rate and recoverability and environmental protection, and becomes a main stream product in the packaging film market. However, the PETG heat-shrinkable film has the characteristics of high shrinkage rate and high shrinkage force, and the shrinkage force of a standard sample of the PETG heat-shrinkable film is generally more than 10N, when the PETG heat-shrinkable film is used for daily chemical product packaging containers made of PE and PP materials, the deformation of the daily chemical product packaging containers made of the PE and PP materials can be caused due to the fact that the heat-shrinkable force is large (the daily chemical product packaging containers can be sleeved with the heat-shrinkable film in advance before being filled), so that popularization and application of the PETG heat-shrinkable film in the daily chemical industry are affected.
At present, a thermal shrinkage film manufacturer forms a thermal shrinkage film with a composite structure through PETG and PS, and reduces the shrinkage force (3.8N-4.2N) of the thermal shrinkage film on the premise of ensuring the shrinkage rate (78% -80%); however, due to insufficient binding force between the PETG and PS materials, film separation and film surface wrinkling are easy to occur after thermal shrinkage, and the packaging effect is affected, so that the practical application effect is not ideal.
The national patent application with the application number of 202111018210.X discloses a composite PETG heat-shrinkable film and a preparation system thereof, wherein the composite PETG heat-shrinkable film is composed of a B layer (core film layer) and an A layer and a C layer (surface film layer) which are arranged on two sides of the B layer in a composite way, wherein a base material of the B layer is PS, the base materials of the A layer and the C layer are PETG, and the shrinkage force of the heat-shrinkable film is reduced through a PS and PETG composite film structure; in order to solve the problems of insufficient binding force between two materials of PETG and PS and easy occurrence of film separation and film surface wrinkling after thermal shrinkage, two core technical schemes are adopted in the patent application: 1. through adding functional master batches into PETG and PS, the PETG and PS are modified and adjusted, so that the PETG and PS have the same or similar fluidity at the same extrusion temperature, and the problem that the interface between the surface film layer and the core film layer forms ripple defects due to the difference of the fluidity at the same temperature is solved; 2. the method that the three-layer structures of the layer A, the layer B and the layer C share one extrusion die head is adopted to carry out coextrusion, the mixing of materials is generated at the interface of the layer A, the layer B and the layer C, the binding force between the PETG and the PS is improved, and the problem that the film separation and the film surface wrinkling easily occur after thermal shrinkage is solved; however, when the patent is implemented, three problems exist: 1. the PETG and PS are added with functional master batch modification treatment, so that the production flow is increased, the production cost is increased, and the market competitiveness of the product is reduced; 2. the components of the modified functional master batch added in PETG and PS are too complex, so that the proportion control of the material components is relatively complex in actual production, and the production process planning and organization scheduling difficulty is increased; 3. the method for sharing the extrusion die head by the three layers of the A layer, the B layer and the C layer is not the prior production equipment and process, and the prior production line is required to be greatly modified, so that the investment cost for modifying the production line is high, the period is long, the modified production line cannot be compatible with the production of the prior composite heat-shrinkable film with the multilayer structure, the production process planning and organization scheduling difficulty is further increased, the equipment utilization rate is even reduced, and the economic benefit of enterprises is influenced; in addition, the shrinkage force of the composite PETG heat-shrinkable film is actually determined by the thickness ratio of the surface film layer and the core film layer, and the shrinkage force is much lower than that of the existing PETG heat-shrinkable film, so that the thickness ratio of the surface film layer and the core film layer in the heat-shrinkable film finished product needs to be controlled on line, otherwise, the heat shrinkage force of the composite heat-shrinkable film finished product cannot be controlled stably; the existing coextrusion biaxial stretching production line only has the function of detecting the total film thickness, and the thicknesses of the surface film layer and the core film layer cannot be detected, so that the on-line control of the shrinkage force of the heat-shrinkable film cannot be realized, and the produced composite heat-shrinkable film has larger deviation of the shrinkage force; therefore, how to realize the on-line detection, control and adjustment of the shrinkage force of the heat-shrinkable film is also a technical problem faced by the control of the production process of the composite heat-shrinkable film, but no solution is given in the national patent application of the invention of the application number 202111018210. X.
Disclosure of Invention
In order to overcome the defects in the background art, the invention discloses a shrinkage force controllable composite heat-shrinkable film, a production process and a shrinkage force control method, wherein the composite heat-shrinkable film comprises a three-layer composite structure, surface film layers are PETG, a core film layer is a mixture of PETG, PS, K resin, the PS component in the core film layer reduces the shrinkage force of the composite heat-shrinkable film, and meanwhile, the PETG component in the core film layer solves the problem of low bonding force between the core film layer and the surface film layer PETG material, so that the film layer separation and film surface wrinkling phenomenon after heat shrinkage are solved; the composite heat-shrinkable film is manufactured through the existing three-layer coextrusion biaxial stretching production line, the shrinkage force on-line measuring device is arranged on the side edge of the winding device, the relative shrinkage force of the composite heat-shrinkable film is detected on line, the thickness proportion of the surface film layer and the core film layer of the composite heat-shrinkable film is controlled in a feedback mode, on-line control of the shrinkage force of a finished product of the composite heat-shrinkable film is achieved, and the heat shrinkage force of the composite heat-shrinkable film is controllable and stable.
In order to achieve the aim of the invention, the invention adopts the following technical scheme: a composite heat shrinkage film is of a three-layer composite structure and comprises a surface film layer and a core film layer clamped between the two surface film layers; the thermal shrinkage force range is 2-6N; the surface film layer is made of the same material, and comprises 64-98 parts by mass of PETG (polyethylene terephthalate-1, 4-cyclohexanedimethanol ester), 0-30 parts by mass of PET (polyethylene terephthalate) and 2-6 parts by mass of slipping agent; the core film layer material comprises 20-80 parts by mass of PS (polystyrene), 15-70 parts by mass of PETG (polyethylene terephthalate-1, 4-cyclohexanedimethanol), and 0-10 parts by mass of K resin (styrene-butadiene transparent impact resin); wherein the K resin is a block copolymer synthesized by taking styrene and butadiene as monomers, taking alkyl lithium as an initiator and adopting an anionic solution polymerization technology; in the composite heat-shrinkable film of the present invention, the reduction of the shrinkage force is achieved by the PS (polystyrene) component in the core film layer material; adding a component PETG (polyethylene terephthalate-1, 4-cyclohexanedimethanol ester) into PS (polystyrene) to form a PS (polystyrene) and PETG (polyethylene terephthalate-1, 4-cyclohexanedimethanol ester) mixture, and utilizing the characteristic that the component of the PETG (polyethylene terephthalate-1, 4-cyclohexanedimethanol ester) in the mixture is the same as that of a surface film layer material, so that a stable and reliable binding force is formed at the interface between a core film layer and the surface film layer, the problem of insufficient binding force between the surface film layer material and the core film layer material is solved, and the phenomenon of film layer separation and film surface wrinkling of the composite heat-shrinkable film after heat shrinkage is prevented; the component K resin is added into the core film layer material to improve the cracking problem of PS (polystyrene) in the stretching process; the component PET (polyethylene terephthalate) is added into the surface film PETG (polyethylene terephthalate-1, 4-cyclohexanedimethanol ester) to reduce the cost of the product; the surface film layer and the core film layer of the composite heat shrinkage film do not need modification treatment, the production flow is short, and the composite heat shrinkage film has the advantage of low production cost; the related factors influencing the shrinkage force of the composite heat-shrinkable film mainly comprise three components: 1. the total thickness of the composite heat shrinkage film; 2. the proportion of PS (polystyrene) in the core layer material; 3. the thickness ratio of the surface film layer to the core film layer; on the premise of given total thickness and shrinkage force, the proportion of each component in the core film layer material and the proportion of the surface film layer and the core film layer thickness are required to be designed before production of the composite heat shrinkage film product; when the composite heat-shrinkable film is actually produced, the proportion of each component in the core film layer material is fixed and cannot be changed, but the thickness proportion of the surface film layer to the core film layer is feedback controlled through the on-line detected relative shrinkage force of the composite heat-shrinkable film, so that the on-line dynamic control of the thickness proportion of the surface film layer to the core film layer is realized, and the on-line control of the heat shrinkage force of the composite heat-shrinkable film finished product is realized;
The thickness of the surface film layer of the composite heat-shrinkable film with the three-layer composite structure is determined according to the total thickness of the composite heat-shrinkable film and the heat shrinkage force; the mass ratio of each component of the core film layer is designed according to the thermal shrinkage force required by the composite thermal shrinkage film and the thermal shrinkage force empirical formula of the surface film layer and the core film layer; the empirical formula of the thermal shrinkage force of the surface film layer is as follows: fb=tb×kp; fb is surface film layer heat shrinkage force, tb is surface film layer thickness, kp is PETG film unit thickness heat shrinkage force coefficient (its empirical value is 0.2);
the thermal shrinkage force empirical formula of the core film layer is as follows: fx=tx (Kp kpt +ks kst +kk kkt); wherein Fx is core film layer heat shrinkage force, tx is core film layer thickness, kp is PETG film unit thickness heat shrinkage force coefficient (empirical value 0.2), kpt is PETG component proportion correction coefficient, ks is PS film unit thickness heat shrinkage force coefficient (empirical value 0.04), kst is PS component proportion correction coefficient, kk is K resin film unit thickness heat shrinkage force coefficient (empirical value 0.04), kkt is K resin component proportion correction coefficient.
Further, the slipping agent is silicon dioxide or kaolin; in the surface film layer, the proportion of the slipping agent components has no obvious influence on the transparency of the surface film layer under the condition that the proportion is not more than 10% of the total mass of the surface film layer; when the total thickness of the composite heat-shrinkable film is smaller, the proportion of the slipping agent usually takes a larger value; when the total thickness of the composite heat shrinkable film is large, the proportion of the slipping agent usually takes a small value.
Further, the total thickness of the composite heat-shrinkable film is 20-50 mu m; the thickness of the surface film layer is equal, and the total thickness of the surface film layer accounts for 10-20% of the total thickness of the composite heat-shrinkable film; when the total thickness of the composite heat-shrinkable film is thinner, the proportion of the surface film layer to the total thickness of the composite heat-shrinkable film usually takes a larger value, so that the difficulty in controlling the actual thickness caused by the excessively thin surface film layer is prevented; when the total thickness of the composite heat-shrinkable film is thicker, the proportion of the surface film layer to the total thickness of the composite heat-shrinkable film is usually smaller, so that the shrinkage force of the composite heat-shrinkable film is prevented from being larger due to the overlarge thickness of the surface film layer; in addition, when the total thickness of the composite heat-shrinkable film is thicker, the smaller thickness of the surface film layer is selected, so that the product cost is reduced.
A production process of a composite heat-shrinkable film adopts a three-layer co-extrusion biaxial stretching process for production; the specific technical process comprises the following steps:
s1, extrusion tabletting: the surface film layer material and the core film layer material are fully dried and mixed, then are respectively placed in three screw extruders, are heated, stirred and melted into viscous fluid section by section, and are uniformly extruded into three laminar viscous fluids through three T-shaped die heads after being metered; wherein the T-shaped die corresponding to the core film layer is positioned in the middle of the T-shaped die corresponding to the surface film layer; wherein the extrusion temperature of the viscous fluid of the core film layer is 220-270 ℃; wherein the extrusion temperature of the surface film layer viscous fluid is 240-260 ℃; in actual production, the PS component is included in the core film layer viscous fluid, and the fluidity of the PS component is greater than that of the surface film layer viscous fluid (related to the proportion of the PS component), so that the extrusion temperature of the core film layer viscous fluid is lower than that of the surface film layer viscous fluid; under the adsorption action of the electrostatic steel belt adsorption device, the three slice viscous fluids are combined at the interface to form a thick slice viscous fluid with a three-layer composite structure, and the thick slice viscous fluid is tightly attached to a chilling roller to be forcedly cooled into a three-layer composite casting slice;
S2, longitudinal stretching: preheating the three-layer composite cast sheet to 80-90 ℃ by a plurality of rollers, and then longitudinally stretching the three-layer composite cast sheet in a longitudinal stretching chamber at a temperature of 100-115 ℃ to form a film at a multiplying power of 1.2-3; stretching longitudinally to form a film, and shaping for 2-5s at the temperature of 80-90 ℃;
s3, transversely stretching: transversely stretching the shaped longitudinal stretched film in a transverse stretching chamber at a temperature of 95-120 ℃ and a multiplying power of 3-5.5 along the transverse direction; shaping at 70-95 deg.c for 5-10s after transverse stretching;
s4, trimming and rolling: cutting edges of the transversely stretched composite heat-shrinkable film twice, cutting the transversely stretched composite heat-shrinkable film according to a set width specification, and finally rolling the transversely stretched composite heat-shrinkable film into a finished product of the composite heat-shrinkable film; the first trimming cuts off the edge part of the composite heat-shrinkable film clamped by the transverse stretching chain clamp, and the second trimming cuts off the on-line heat-shrinkable force to continuously detect the sample; in the invention, in order to reduce the material waste caused by the continuous detection of the on-line shrinkage force of the second trimming cutting, the continuous detection of the on-line shrinkage force is cut on one side of the composite heat shrinkage film, the width of the continuous detection of the on-line shrinkage force is 30mm, which is twice the width of the standard heat shrinkage force detection sample, so as to improve the maximum shrinkage force of the continuous detection of the on-line shrinkage force and the accuracy and stability of the relative shrinkage force detected by the continuous detection of the on-line shrinkage force.
Further, the thickness control of the composite heat-shrinkable film comprises total thickness control and surface film layer and core film layer thickness proportion double closed loop feedback control; the total thickness of the composite heat shrinkage film is controlled by controlling the quality of the total viscous fluid which is extruded by metering of a surface film layer and a core film layer screw extruder through actual thickness feedback detected by an online thickness detector; the thickness ratio of the surface film layer and the core film layer of the composite heat shrinkage film is controlled, and the mass ratio of the viscous fluid which is extruded by the screw extruder corresponding to the surface film layer and the core film layer is measured; and the mass ratio of the viscous fluid extruded by the screw extruder corresponding to the surface film layer and the core film layer is measured, and the feedback control is carried out by the on-line detected relative shrinkage force of the composite heat shrinkage film.
The shrinkage force control method of the composite heat-shrinkable film comprises the steps of detecting and obtaining the relative shrinkage force of a sample detected by the composite heat-shrinkable film cut by a second trimming through an on-line shrinkage force measuring device fixedly arranged on the side edge of a winding machine, and controlling the thickness of a surface film layer and a core film layer of the composite heat-shrinkable film through feedback of the detected relative shrinkage force to control the heat shrinkage force of a finished product of the composite heat-shrinkable film.
Further, the shrinkage force on-line measuring device comprises a bottom plate, and a feeding traction roller set, a thermal shrinkage device and a discharging traction roller set which are sequentially and fixedly arranged on the bottom plate, wherein a dynamic torque sensor is arranged on the discharging traction roller set; detecting the driving torque of the discharging traction roller set through a dynamic torque sensor, and further obtaining the relative shrinkage force of the composite heat shrinkage film; the working principle of the shrinkage force on-line measuring device is as follows: when the shrinkage force on-line measuring device works, an on-line shrinkage force continuous detection sample obtained by cutting edges for the second time enters a heat shrinkage device through a feeding traction roller group, a heat shrinkage cavity is arranged in the heat shrinkage device, a heat shrinkage temperature of 110 ℃ is arranged in the heat shrinkage cavity, the on-line shrinkage force continuous detection sample in the heat shrinkage cavity generates shrinkage trend, and the on-line shrinkage force continuous detection sample between the feeding traction roller group and the discharging traction roller group cannot generate shrinkage because the rotating speeds of the feeding traction roller group and the discharging traction roller group are the same, so that a tension is generated by the on-line shrinkage force continuous detection sample between the feeding traction roller group and the discharging traction roller group, and the tension is the relative shrinkage force of the composite heat shrinkage film; the relative shrinkage force is in direct proportion to the torque detected by the dynamic torque sensor (under the condition that the diameter of the traction roller is fixed), so that the relative shrinkage force of the composite heat shrinkage film can be calculated according to the torque; the relative shrinkage force is in corresponding relation with the shrinkage force of the composite heat-shrinkable film finished product, and the shrinkage force of the composite heat-shrinkable film finished product is only related to the thickness ratio of the surface film layer to the core film layer (for the composite heat-shrinkable film produced on line, the production process parameters, the total thickness of the heat-shrinkable film and the ratio of PS components in the core film layer material are all fixed), so that the shrinkage force of the composite heat-shrinkable film finished product can be controlled by feedback control of the thickness ratio of the surface film layer and the core film layer of the composite heat-shrinkable film through the relative shrinkage force, thereby realizing on-line control of the shrinkage force of the composite heat-shrinkable film finished product.
Preferably, a magnetorheological fluid clutch is arranged on the discharging traction roller set; when the rotation speeds of the feeding traction roller set and the discharging traction roller set are synchronous, the relative shrinkage force of the composite heat shrinkage film is obtained through the working current of the magnetorheological fluid clutch; the working current of the magnetorheological fluid clutch is in a proportional relation with the working torque of the magnetorheological fluid clutch, and the working torque of the magnetorheological fluid clutch is in a proportional relation with the relative shrinkage force, so that the relative shrinkage force of the composite heat shrinkage film can be calculated by the working current of the magnetorheological fluid clutch; the shrinkage force of the finished product of the composite heat-shrinkable film can be controlled by controlling the thickness proportion of the surface film layer and the core film layer of the composite heat-shrinkable film through the relative shrinkage force.
Further, the corresponding relation between the relative shrinkage force of the composite heat shrinkage film and the heat shrinkage force of the composite heat shrinkage film finished product is obtained through experiments; the corresponding data between the relative shrinkage force and the thermal shrinkage force can be obtained through experiments, and after curve fitting, a relation curve between the relative shrinkage force and the thermal shrinkage force is obtained, and the relation curve between the relative shrinkage force and the thermal shrinkage force is arranged in a production line control system and used for feedback control of the relative shrinkage force on the thickness ratio of the surface film layer to the core film layer; the aim of the arrangement is that when the thermal shrinkage force of the composite thermal shrinkage film finished product is set on the production line, if the control parameter on the display screen is the relative shrinkage force of the composite thermal shrinkage film, the thermal shrinkage force of the composite thermal shrinkage film finished product is also required to be calculated and converted into the relative shrinkage force of the composite thermal shrinkage film on the display screen manually, so that the operation is very inconvenient; after the relation curve between the relative shrinkage force and the thermal shrinkage force is arranged in the production line control system, when the thermal shrinkage force of the composite thermal shrinkage film finished product is adjusted on line, the required thermal shrinkage force value of the composite thermal shrinkage film finished product is directly input, and the manual conversion is not needed, so that the convenience of operation is greatly improved.
Due to the adoption of the technical scheme, the invention has the following beneficial effects: the composite heat-shrinkable film, the production process and the shrinkage force control method disclosed by the invention comprise a three-layer composite structure, wherein the surface film layers are PETG, the core film layer is a mixture of PETG, PS, K resin, and the composite heat-shrinkable film has the advantage of simple material components, and reduces the production process planning and tissue scheduling difficulty; the PS component in the core film layer reduces the shrinkage force of the composite heat-shrinkable film, and meanwhile, the PETG component in the core film layer solves the problem of low binding force between the core film layer and the PETG material of the surface film layer, thereby solving the film layer separation and film surface wrinkling phenomenon after heat shrinkage; the composite heat shrinkage film is prepared by the existing three-layer coextrusion biaxial stretching production line, the existing production line is not required to be greatly modified, meanwhile, other multi-layer structure composite films can be produced, and the utilization rate of the production line is guaranteed; the on-line shrinkage force measuring device is arranged on the side edge of the winding device of the existing production line, the relative shrinkage force of the composite heat-shrinkable film is detected on line, the thickness proportion of the surface film layer and the core film layer of the composite heat-shrinkable film is controlled through the feedback control of the relative shrinkage force, the on-line control of the shrinkage force of the finished product of the composite heat-shrinkable film is realized, and meanwhile, the shrinkage force of the finished product of the composite heat-shrinkable film can be conveniently adjusted on line; the invention has the advantages of simple core film layer and surface film layer, short production flow, small change to the existing three-layer production line, low cost investment, compatibility with the existing production of the composite heat-shrinkable film with the multilayer structure, simple production process planning and organization scheduling, low production cost, high equipment utilization rate and stable quality of the composite heat-shrinkable film, thereby fully ensuring the competitive advantage and economic benefit of enterprises.
Drawings
FIG. 1 is a schematic view of an on-line measuring device for contractility;
fig. 2 is an exploded view of the heat shrink device.
In the figure: 1. a bottom plate; 2. a feed pull roll set; 3. a thermal shrinkage device; 3.1, a lower thermal shrinkage box body; 3.1.1, infrared heating tube; 3.1.2, a temperature sensor; 3.2, feeding a heat shrinkage box body; 4. a discharging traction roller set; 4.1, a dynamic torque sensor; 5. a heat shrinkage film; 6. a heat insulating plate; 7. a speed measuring sensor.
Detailed Description
The invention will be explained in more detail by the following examples, the purpose of which is to protect all technical improvements within the scope of the invention.
Example 1
A finished product of the composite heat-shrinkable film is of a three-layer composite structure, the total thickness is 20 mu m, and the heat shrinkage force of the finished product is required to be 2N; the design process of the composite heat shrinkage film surface film layer and core film layer structure thickness parameters and the surface film layer and core film layer structure is as follows:
the total thickness of the composite heat-shrinkable film is thinner, the upper limit value of the total thickness of the surface film layer is 20%, the thickness of the single-layer surface film layer is 2 mu m, and the thickness of the core film layer is 16 mu m; the surface film layer is made of PETG (polyethylene terephthalate-1, 4-cyclohexanedimethanol ester) and a slipping agent, and PET (polyethylene terephthalate) is not added; the core membrane layer material is a mixture of PS (polystyrene), PETG (polyethylene terephthalate-1, 4-cyclohexanedimethanol ester) and K resin (styrene-butadiene transparent impact resin); the composite heat-shrinkable film of the embodiment has a thinner total thickness, and has larger longitudinal and transverse stretching multiples in the production process, and the upper limit value of the K resin (styrene-butadiene transparent impact resin) component is 10 parts by mass for preventing the core film layer from stretching and cracking in the stretching process; in addition, the total thickness of the composite heat-shrinkable film is thinner, and in order to ensure that a finished film roll can be smoothly separated in use, the upper limit value of a slipping agent component in a surface film layer is 6 parts by mass, and silicon dioxide is adopted as the slipping agent;
The thermal shrinkage force provided by the surface film layer is estimated by an empirical formula fb=tb×kp, wherein Fb is the thermal shrinkage force of the surface film layer, tb is the thickness of the surface film layer, kp is the thermal shrinkage force coefficient of the PETG film unit thickness, the empirical value of the PETG material is 0.2, and fb=4× 0.2=0.8n;
the heat shrinkage force provided by the core film layer is estimated by an empirical formula fx=tx (Kp kpt +ks kst +kk kkt), wherein Fx is the core film layer heat shrinkage force, tx is the core film layer thickness, kp is the PETG film unit thickness heat shrinkage force coefficient (empirical value 0.2), kpt is the PETG component proportion correction coefficient, ks is the PS film unit thickness heat shrinkage force coefficient (empirical value 0.04), kst is the PS component proportion correction coefficient, kk is the K resin film unit thickness heat shrinkage force coefficient (empirical value 0.04), kkt is the K resin component proportion correction coefficient; the thermal shrinkage force provided by the surface film layer is set to be 0.8N, and the thermal shrinkage force fx=1.2n provided by the core film layer; the thickness of the top layer has been set to 4 μm, then the thickness of the core layer tx=16 μm; when the K resin component is 10 parts by mass, kkt =0.1; and (3) taking the determined value into a thermal shrinkage force empirical formula provided by the core film layer, and obtaining a shrinkage force calculation formula of the composite thermal shrinkage film, wherein the shrinkage force calculation formula is as follows:
1.2=16*（0.2*kpt+0.04*kst+0.04*0.1）；
performing repeated iterative operation on the above materials, obtaining proper kpt and kst, and finally obtaining kpt to obtain 0.25 and kst to obtain 0.65, wherein the design heat shrinkage force of the composite heat shrinkage film is 1.92N and is smaller than 0.1N of a heat shrinkage force control standard, so that the design requirement is met; in the core-film layer mixture, the PS (polystyrene) component is 65 parts by mass, the PETG (polyethylene terephthalate-1, 4-cyclohexanedimethanol ester) component is 25 parts by mass, and the K resin component is 10 parts by mass;
In summary, the total thickness is 20 mu m, the thermal shrinkage force of the finished product is 2N, the thickness parameter of the three-layer structure is 2 mu m of the surface film layer, and the thickness parameter of the core film layer is 16 mu m; the components of the surface film layer are as follows: 94 parts by mass of PETG and 6 parts by mass of silicon dioxide slipping agent; the components of the core film layer are as follows: 65 parts by mass of PS,25 parts by mass of PETG and 10 parts by mass of K resin.
The production process parameters of the composite heat-shrinkable film are set:
extrusion temperature: firstly, determining the extrusion temperature of a core film layer, wherein the extrusion temperature of the core film layer is set to be close to the lower limit value of the extrusion temperature range of the core film layer and is 230 ℃ because the mass parts of PS components in the core film layer are higher; the fluidity of PETG in the surface film layer is not high in sensitivity to temperature, the extrusion temperature is increased by 10 ℃ on the basis of the extrusion temperature of the core film layer, and the value is 240 ℃;
stretching in the longitudinal and transverse directions: because the total thickness of the composite heat-shrinkable film is thinner, the longitudinal stretching multiple and the transverse stretching multiple of the composite heat-shrinkable film are close to the upper limit value in order to prevent poor control stability caused by small extrusion amount in the production process, wherein the longitudinal stretching multiple takes a value of 3, and the transverse stretching multiple takes a value of 5.5;
because the values of the longitudinal stretching multiple and the transverse stretching multiple are higher, the preheating temperature of the three-layer composite casting sheet with multiple rollers is set at 90 ℃ and the longitudinal stretching temperature is set at 115 ℃ during longitudinal stretching; when stretching transversely, the longitudinal stretching temperature is set at 120 ℃;
In order to ensure the heat shrinkage rate and the heat shrinkage force of the finished product, the longitudinal stretching and shaping temperature is set at 80 ℃, and the shaping time is set at 4s; setting the transverse stretching and setting temperature at 80 ℃ and setting time at 8s;
in summary, the production process of the composite heat-shrinkable film comprises the following steps:
s1, extrusion tabletting: the surface film layer material and the core film layer material are fully dried and mixed, then are respectively placed in three screw extruders, are heated, stirred and melted into viscous fluid section by section, and are uniformly extruded into three laminar viscous fluids through three T-shaped die heads after being metered; wherein the T-shaped die corresponding to the core film layer is positioned in the middle of the T-shaped die corresponding to the surface film layer; wherein the extrusion temperature of the viscous fluid of the core film layer is 230 ℃; wherein the extrusion temperature of the surface film layer viscous fluid is 240 ℃; the three slice viscous fluids are combined into thick slice viscous fluid with a three-layer composite structure under the adsorption action of the electrostatic steel belt adsorption device, and are tightly attached to a chilling roller to be forcedly cooled into three-layer composite casting slices;
s2, longitudinal stretching: preheating the three-layer composite casting sheet to 90 ℃ by a plurality of rollers, and stretching the three-layer composite casting sheet in a longitudinal stretching chamber at 115 ℃ to form a film at a rate of 3.0 along the longitudinal direction; stretching longitudinally to form a film, and shaping for 4s at 80 ℃;
S3, transversely stretching: transversely stretching the shaped longitudinal stretching film in a transverse stretching chamber at a temperature of 115 ℃ at a rate of 5.5 times in the transverse direction; shaping at 80 ℃ after transverse stretching, wherein the shaping time is 8s;
s4, trimming and rolling: cutting edges of the transversely stretched composite heat-shrinkable film twice, cutting the transversely stretched composite heat-shrinkable film according to a set width specification, and finally rolling the transversely stretched composite heat-shrinkable film into a finished product of the composite heat-shrinkable film; the edge part of the composite heat-shrinkable film clamped by the transverse stretching chain clamp is cut off by the first trimming, wherein the on-line shrinkage force continuous detection sample is cut off by the second trimming, and the width of the on-line shrinkage force continuous detection sample is 30mm;
in the production process of the composite heat-shrinkable film, the thickness control comprises double closed-loop feedback control of the total thickness and the thickness proportion of the surface film layer and the core film layer; the total thickness of the composite heat shrinkage film is controlled by controlling the quality of the total viscous fluid which is extruded by metering of a surface film layer and a core film layer screw extruder through actual thickness feedback detected by an online thickness detector; the thickness ratio of the surface film layer and the core film layer of the composite heat shrinkage film is controlled, and the mass ratio of the viscous fluid which is extruded by the screw extruder corresponding to the surface film layer and the core film layer is measured.
The shrinkage force control method of the composite heat-shrinkable film comprises the steps of detecting the relative shrinkage force of a sample by a shrinkage force on-line measuring device fixedly arranged on the side of a winding machine, cutting a 30mm wide composite heat-shrinkable film for the second time, and controlling the thickness ratio of a surface film layer and a core film layer of the composite heat-shrinkable film through feedback of the detected relative shrinkage force to control the shrinkage force of a finished product of the composite heat-shrinkable film; it is added that in the production process of the composite heat-shrinkable film, the shrinkage force is controlled on line, mainly for two reasons: 1. the structural thickness parameters of the surface film layer and the core film layer and the structural parameters of the surface film layer and the core film layer of the composite heat-shrinkable film are calculated based on a surface film layer heat-shrinkable force empirical formula and a surface film layer heat-shrinkable force empirical formula, and a certain deviation exists between the actual heat-shrinkable force and a design value of the composite heat-shrinkable film produced according to the parameters; 2. raw material supplies used by the composite heat-shrinkable film, the physicochemical properties of different supply batches are not completely consistent, and based on the same surface film layer and core film layer structure thickness parameters, surface film layer and core film layer composition parameters and production process parameters, the actual heat shrinkage force of the finally produced composite heat-shrinkable film is different due to different supply batches, and larger batch deviation exists; therefore, the heat shrinkage force control of the composite heat shrinkage film finished product is a technical problem; after the shrinkage force control method of the composite heat-shrinkable film is adopted, the problem that deviation exists between the actual heat-shrinkable force and the design value caused by different design values and actual values and different incoming material batches can be solved, so that the controllability and the stability of the heat-shrinkable force of the low-shrinkage composite heat-shrinkable finished product are ensured;
The structure of the shrinkage force on-line measuring device is shown in the attached figure 1 of the specification, and the shrinkage force on-line measuring device comprises a bottom plate 1, and a feeding traction roller set 2, a heat shrinkage device 3 and a discharging traction roller set 4 which are sequentially and fixedly arranged on the bottom plate 1; the feeding traction roller set 2 and the discharging traction roller set 4 comprise a pair of traction rollers which are in up-down collision, the lower traction roller of the feeding traction roller set 2 is connected with a servo motor A through a coupler, and the lower traction roller of the discharging traction roller set 4 is connected with a servo motor B through a dynamic torque sensor 4.1; the servo motor A and the servo motor B respectively drive the feeding traction roller set 2 and the discharging traction roller set 4 to rotate at the same rotating speed; the thermal shrinkage device 3 is arranged between the feeding traction roller set 2 and the discharging traction roller set 4, and referring to the attached drawing 2 in the specification, the thermal shrinkage device 3 comprises a lower thermal shrinkage box body 3.1 and an upper thermal shrinkage box body 3.2, infrared heating pipes 3.1.1 are fixedly arranged in the lower thermal shrinkage box body 3.1 and the upper thermal shrinkage box body 3.2, and a temperature sensor 3.1.2 is fixedly arranged in the lower thermal shrinkage box body 3.1; the lower heat shrinkage box body 3.1 and the upper heat shrinkage box body 3.2 are fixedly connected to form a hollow heat shrinkage cavity, the heat shrinkage cavity is heated by an infrared heating pipe 3.1.1 and is controlled by a temperature sensor 3.1.2 in a feedback manner, so that the heat shrinkage cavity is stably kept at a set 110 ℃; a feeding hole is formed in one side of the heat shrinkage cavity adjacent to the feeding traction roller group 2, and a discharging hole is formed in one side of the heat shrinkage cavity adjacent to the discharging traction roller group 4; before the on-line measuring device of the shrinkage force works, firstly, a corresponding relation curve between the relative shrinkage force of the composite heat-shrinkable film and the heat shrinkage force of the finished product of the composite heat-shrinkable film is obtained in a laboratory through a plurality of experiments, and the corresponding relation curve is arranged in a control system of a heat-shrinkable film production line; when the shrinkage force online measuring device works, the rotation linear speeds of the feeding traction roller set 2 and the discharging traction roller set 4 are the same as the winding linear speed of the winding machine of the heat shrinkage film production line; the feeding traction roller set 2 introduces a 30mm wide thermal shrinkage force continuous detection sample cut by the second trimming into a 110 ℃ thermal shrinkage cavity through a feed port, and then enters the discharging traction roller set 4 through a discharge port; the thermal shrinkage force continuously detects that a sample is heated in a thermal shrinkage cavity to generate shrinkage trend, relative shrinkage force is generated, the dynamic torque sensor 4.1 of the discharging traction roller set 4 outputs traction torque, and the relative shrinkage force is calculated through the traction torque;
The process of on-line control of the shrinkage force of the composite heat shrinkage film is as follows: before the production of the composite heat-shrinkable film, inputting the heat-shrinkable force parameter 2N of the finished product of the composite heat-shrinkable film into a control system of a heat-shrinkable film production line, and calculating the relative shrinkage force by the control system according to a corresponding relation curve between the relative shrinkage force and the heat-shrinkable force, namely, the target relative shrinkage force for online control of the finished product of the composite heat-shrinkable film; the traction torque detected by the dynamic torque sensor 4.1 is calculated and converted into real-time relative shrinkage force, the real-time relative shrinkage force is compared with the target relative shrinkage force by the heat shrinkage film production line control system, when the real-time relative shrinkage force is larger than the target relative shrinkage force, the production line control system sends a control signal, the mass of the viscous fluid metered and extruded by the screw extruder corresponding to the surface film layer is reduced, the mass of the viscous fluid metered and extruded by the screw extruder corresponding to the core film layer is increased, the thickness proportion of the surface film layer and the core film layer is adjusted, and meanwhile, the total thickness of the composite heat shrinkage film is kept unchanged; similarly, when the real-time relative shrinkage force is smaller than the target relative shrinkage force, the production line control system sends a control signal, increases the mass of the viscous fluid metered and extruded by the screw extruder corresponding to the surface film layer, reduces the mass of the viscous fluid metered and extruded by the screw extruder corresponding to the core film layer, adjusts the thickness ratio of the surface film layer to the core film layer, and ensures that the total thickness of the composite heat-shrinkable film is kept unchanged, thereby realizing the on-line control of the shrinkage force of the composite heat-shrinkable film finished product.
Example two
A finished product of the composite heat-shrinkable film is of a three-layer composite structure, the total thickness is 30 mu m, and the heat shrinkage force of the finished product is required to be 3N; the thickness parameters of the surface film layer and the core film layer of the composite heat shrinkage film and the surface film layer and the core film layer are designed as follows:
the total thickness of the composite heat shrinkage film is thinner, the upper limit value of the total thickness of the surface film layer is 20%, the thickness of the single-layer surface film layer is 3 mu m, and the thickness of the core film layer is 24 mu m; the surface film layer is made of PETG (polyethylene terephthalate-1, 4-cyclohexanedimethanol ester) and a slipping agent, and PET (polyethylene terephthalate) is not added; the core membrane layer material is a mixture of PS (polystyrene), PETG (polyethylene terephthalate-1, 4-cyclohexanedimethanol ester) and K resin (styrene-butadiene transparent impact resin); the composite heat-shrinkable film of the embodiment has a thinner total thickness, and has larger longitudinal and transverse stretching multiples in the production process, and the upper limit value of the K resin (styrene-butadiene transparent impact resin) component is 10 parts by mass for preventing the core film layer from stretching and cracking in the stretching process; in addition, the total thickness of the composite heat-shrinkable film is thinner, and in order to ensure that a finished film roll can be smoothly separated in use, the upper limit value of a slipping agent component in a surface film layer is 6 parts by mass, and silicon dioxide is adopted as the slipping agent;
The thermal shrinkage force provided by the surface film layer is estimated by an empirical formula fb=tb×kp, wherein Fb is the thermal shrinkage force of the surface film layer, tb is the thickness of the surface film layer, kp is the thermal shrinkage force coefficient of the PETG film unit thickness, the empirical value of the PETG material is 0.2, and fb=6x0.2=1.2n of the thermal shrinkage force provided by the surface film layer;
the heat shrinkage force provided by the core film layer is estimated by an empirical formula fx=tx (Kp kpt +ks kst +kk kkt), wherein Fx is the core film layer heat shrinkage force, tx is the core film layer thickness, kp is the PETG film unit thickness heat shrinkage force coefficient (empirical value 0.2), kpt is the PETG component proportion correction coefficient, ks is the PS film unit thickness heat shrinkage force coefficient (empirical value 0.04), kst is the PS component proportion correction coefficient, kk is the K resin film unit thickness heat shrinkage force coefficient (empirical value 0.04), kkt is the K resin component proportion correction coefficient; the thermal shrinkage force provided by the surface film layer is set to be 1.2N, and the thermal shrinkage force fx=1.8n provided by the core film layer; the thickness of the surface film layer was set to 6 μm, and the thickness of the core film layer tx=24 μm; when the K resin component is 10 parts by mass, kkt =0.1; and (3) taking the determined value into a thermal shrinkage force empirical formula provided by the core film layer, and obtaining a shrinkage force calculation formula of the composite thermal shrinkage film, wherein the shrinkage force calculation formula is as follows:
1.8=24*（0.2*kpt+0.04*kst+0.04*0.1）；
performing repeated iterative operation on the above materials, obtaining proper kpt and kst, and finally obtaining kpt to obtain 0.2 and kst to obtain 0.7, wherein the design heat shrinkage force of the composite heat shrinkage film is 2.928N, which is smaller than the heat shrinkage force control standard 0.1N, so as to meet the requirements; in the core-film layer mixture, the PS (polystyrene) component is 70 parts by mass, the PETG (polyethylene terephthalate-1, 4-cyclohexanedimethanol ester) component is 20 parts by mass, and the K resin component is 10 parts by mass;
In summary, the total thickness is 30 mu m, the thermal shrinkage force of the finished product is 3N, the thickness parameter of the three-layer structure is 3 mu m of the surface film layer, and the thickness parameter of the core film layer is 24 mu m; the components of the surface film layer are as follows: 94 parts by mass of PETG and 6 parts by mass of silicon dioxide slipping agent; the components of the core film layer are as follows: 70 parts by mass of PS,20 parts by mass of PETG and 10 parts by mass of K resin.
The production process parameters of the composite heat-shrinkable film are set:
extrusion temperature: firstly, determining the extrusion temperature of a core film layer, wherein the extrusion temperature of the core film layer is set to be close to the lower limit value of the extrusion temperature range of the core film layer and is 230 ℃ because the mass parts of PS components in the core film layer are higher; the fluidity of PETG in the surface film layer is not high in sensitivity to temperature, the extrusion temperature is increased by 10 ℃ on the basis of the extrusion temperature of the core film layer, and the value is 240 ℃;
stretching in the longitudinal and transverse directions: because the total thickness of the composite heat-shrinkable film is thinner, the longitudinal stretching multiple is close to the upper limit value in order to prevent poor control stability caused by small extrusion amount in the production process, wherein the longitudinal stretching multiple is 2.8, and the transverse stretching multiple is 5.0;
because the values of the longitudinal stretching multiple and the transverse stretching multiple are higher, the preheating temperature of the three-layer composite casting sheet is set at 90 ℃ and the longitudinal stretching temperature is set at 110 ℃ during longitudinal stretching; when stretching transversely, the longitudinal stretching temperature is set at 115 ℃;
In order to ensure the heat shrinkage rate and the heat shrinkage force of the finished product, the longitudinal stretching and shaping temperature is set at 80 ℃, and the shaping time is set at 4s; setting the transverse stretching and setting temperature at 75 ℃ and setting time at 8s;
in summary, the production process of the composite heat-shrinkable film comprises the following steps:
s1, extrusion tabletting: the surface film layer material and the core film layer material are fully dried and mixed, then are respectively placed in three screw extruders, are heated, stirred and melted into viscous fluid section by section, and are uniformly extruded into three laminar viscous fluids through three T-shaped die heads after being metered; wherein the T-shaped die corresponding to the core film layer is positioned in the middle of the T-shaped die corresponding to the surface film layer; wherein the extrusion temperature of the viscous fluid of the core film layer is 230 ℃; wherein the extrusion temperature of the surface film layer viscous fluid is 240 ℃; the three slice viscous fluids are combined into thick slice viscous fluid with a three-layer composite structure under the adsorption action of the electrostatic steel belt adsorption device, and are tightly attached to a chilling roller to be forcedly cooled into three-layer composite casting slices;
s2, longitudinal stretching: preheating the three-layer composite casting sheet to 90 ℃ by a plurality of rollers, and stretching the three-layer composite casting sheet in a longitudinal stretching chamber at a temperature of 110 ℃ to form a film at a rate of 2.8 along the longitudinal direction; stretching longitudinally to form a film, and shaping for 2-5s at 80 ℃;
S3, transversely stretching: transversely stretching the shaped longitudinal stretching film in a transverse stretching chamber at a temperature of 115 ℃ at a multiplying power of 5.0 along the transverse direction; shaping at 75 ℃ after transverse stretching, wherein the shaping time is 8s;
s4, trimming and rolling: cutting edges of the transversely stretched composite heat-shrinkable film twice, cutting the transversely stretched composite heat-shrinkable film according to a set width specification, and finally rolling the transversely stretched composite heat-shrinkable film into a finished product of the composite heat-shrinkable film; the edge part of the composite heat-shrinkable film clamped by the transverse stretching chain clamp is cut off by the first trimming, wherein the on-line shrinkage force continuous detection sample is cut off by the second trimming, and the width of the on-line shrinkage force continuous detection sample is 30mm;
the on-line control method of the thermal shrinkage force of the composite thermal shrinkage film is the same as that of the first embodiment.
Example III
For the composite heat-shrinkable film with the total thickness of 30 mu m and the heat-shrinkable force requirement of 4N, the composite heat-shrinkable film is realized by two methods; the first method is as follows: in the design stage of the structural thickness parameters of the surface film layer and the core film layer and the structural thickness parameters of the surface film layer and the core film layer, the proportion of PS components in the core film layer is reduced by changing the proportion of the components of the core film layer, so that the PS components meet the requirement of the thermal shrinkage 4N of the finished product; for the method, the structural thickness parameters of the surface film layer and the core film layer and the structural thickness parameters of the surface film layer and the core film layer are designed, and the specific parameters are as follows: the thickness parameter of the surface film layer is 4 mu m and the thickness parameter of the core film layer is 22 mu m; the components of the surface film layer are as follows: 94 parts by mass of PETG and 6 parts by mass of silicon dioxide slipping agent; the components of the core film layer are as follows: 47 parts by mass of PS,45 parts by mass of PETG and 8 parts by mass of K resin, wherein the heat shrinkage force is 4.064N; for the method, the production process parameters are set as follows: because the mass part of the PS component in the core film layer is centered, the extrusion temperature of the core film layer is set to be close to the middle value of the extrusion temperature range, and the value is 245 ℃; the fluidity of PETG in the surface film layer is not high in sensitivity to temperature, the extrusion temperature is increased by 10 ℃ on the basis of the extrusion temperature of the core film layer, and the value is 255 ℃; the other process parameters and the heat shrinkage on-line control method are the same as those of the embodiment;
The second method is as follows: under the premise that the components of the surface film layer and the core film layer of the product are unchanged, before production, directly inputting the heat shrinkage force parameter 4N of the finished product of the composite heat shrinkage film into a control system of a heat shrinkage film production line, and automatically adjusting the structural thickness proportion of the surface film layer and the core film layer on line through feedback control of the control system of the production line, so that the thickness of the surface film layer is controlled to be about 7.5 mu m, and the thickness of the core film layer is controlled to be about 15 mu m, thus the finished product of the composite heat shrinkage film can meet the requirement of heat shrinkage force 4N; the production process parameters for this method are set as in the examples.
Example IV
The total thickness is 50 mu m, the thermal shrinkage force of the finished product is 5N, and the structural thickness parameters of the surface film layer and the core film layer and the design process of the surface film layer and the core film layer are the same as those of the first or second embodiment; through design, the total thickness is 50 mu m, and the thermal shrinkage force of the finished product is 5N, and the structural thickness parameters of the surface film layer and the core film layer and the surface film layer and the core film layer are as follows: the total thickness is 50 mu m, the thickness of the surface film layer is 5 mu m, and the thickness of the core film layer is 40 mu m; the components of the surface film layer are as follows: 67 parts by mass of PETG,30 parts by mass of PET and 3 parts by mass of diatomite slipping agent; the components of the core film layer are as follows: 75 parts by mass of PS,23 parts by mass of PETG, in this example, 2 parts by mass of K resin due to the small longitudinal and transverse stretching factors of the production process; the thermal shrinkage force of the composite thermal shrinkage film design in the embodiment is 5.072N;
The production process parameters of the composite heat-shrinkable film are set as follows: because the mass part of the PS component in the core film layer is higher, the extrusion temperature of the core film layer is set near the lower limit value of the extrusion temperature range of the core film layer, and the value is 230 ℃; the extrusion temperature of the surface film layer is increased by 10 ℃ on the basis of the extrusion temperature of the core film layer, and the value is 240 ℃; because the total thickness of the composite heat-shrinkable film is moderate, the longitudinal stretching multiple and the transverse stretching multiple of the composite heat-shrinkable film are all around the median of the parameter range, wherein the longitudinal stretching multiple is 2.5, and the transverse stretching multiple is 4.5; when in longitudinal stretching, the preheating temperature of the three-layer composite casting sheet is set at 85 ℃, the longitudinal stretching temperature is set at 105 ℃, and the transverse stretching temperature is set at 110 ℃; setting the longitudinal stretching and setting temperature at 85 ℃ and setting time at 3s; setting the transverse stretching and setting temperature at 80 ℃ and setting time at 7s; the heat shrinkage force on-line control method is the same as that of the first embodiment.
Example five
The total thickness is 50 mu m, the thermal shrinkage force of the finished product is 6N, and the structural thickness parameters of the surface film layer and the core film layer and the design process of the surface film layer and the core film layer are the same as those of the first embodiment; through design, the total thickness is 50 mu m, and the thermal shrinkage force of the finished product is 6N, and the structural thickness parameters of the surface film layer and the core film layer and the surface film layer and the core film layer are as follows: the total thickness is 50 mu m, the thickness of the surface film layer is 5 mu m, and the thickness of the core film layer is 40 mu m; the components of the surface film layer are as follows: 67 parts by mass of PETG,30 parts by mass of PET and 3 parts by mass of diatomite slipping agent; the components of the core film layer are as follows: 62 parts by mass of PS and 38 parts by mass of PETG, in the embodiment, since longitudinal and transverse stretching multiples in the production process are smaller, and the mass number of PS components is lower than that of the third embodiment, the mass part of K resin is 0; the design heat shrinkage force of the composite heat shrinkage film in the embodiment is 6.032N;
The production process parameters of the composite heat-shrinkable film are set as follows: because the mass part of the PS component in the core film layer is moderately lower, the extrusion temperature of the core film layer is set to be 5 ℃ higher than that of the third embodiment, and the value is 235 ℃; the extrusion temperature of the surface film layer is increased by 10 ℃ on the basis of the extrusion temperature of the core film layer, and the value is 245 ℃; the other production process parameters are the same as those of the embodiment; the heat shrinkage force on-line control method is the same as that of the first embodiment
Example six
In the embodiment, a magneto-rheological fluid clutch is arranged on a discharging traction roller set 4 of the shrinkage force on-line measuring device; when the rotation speeds of the feeding traction roller set 2 and the discharging traction roller set 4 are synchronous, the relative shrinkage force of the composite heat shrinkage film is obtained through the working current of the magnetorheological fluid clutch.
The invention is not described in detail in the prior art.
Claims (9)
1. A composite heat shrinkage film is characterized in that: the composite structure is of a three-layer composite structure and comprises a surface film layer and a core film layer clamped between the two surface film layers; the thermal shrinkage force range is 2-6N; the surface film layer is made of the same material, and comprises 64-98 parts by mass of PETG (polyethylene terephthalate-1, 4-cyclohexanedimethanol ester), 0-30 parts by mass of PET (polyethylene terephthalate) and 2-6 parts by mass of slipping agent; the core film layer material comprises 20-80 parts by mass of PS (polystyrene), 15-70 parts by mass of PETG (polyethylene terephthalate-1, 4-cyclohexanedimethanol), and 0-10 parts by mass of K resin (styrene-butadiene transparent impact resin); wherein the K resin is a block copolymer synthesized by taking styrene and butadiene as monomers, taking alkyl lithium as an initiator and adopting an anionic solution polymerization technology;
The thickness of the surface film layer of the composite heat-shrinkable film with the three-layer composite structure is determined according to the total thickness of the composite heat-shrinkable film and the heat shrinkage force;
the mass parts of the components of the core film layer are designed according to the thermal shrinkage force required by the composite thermal shrinkage film and the thermal shrinkage force empirical formulas of the surface film layer and the core film layer;
the empirical formula of the thermal shrinkage force of the surface film layer is as follows: fb=tb×kp; fb is the thermal shrinkage force of the surface film layer, tb is the thickness of the surface film layer, kp is the thermal shrinkage force coefficient of the PETG film unit thickness;
the thermal shrinkage force empirical formula of the core film layer is as follows: fx=tx (Kp kpt +ks kst +kk kkt); wherein Fx is core film layer heat shrinkage force, tx is core film layer thickness, kp is PETG film unit thickness heat shrinkage force coefficient, kpt is PETG component proportion correction coefficient, ks is PS film unit thickness heat shrinkage force coefficient, kst is PS component proportion correction coefficient, kk is K resin film unit thickness heat shrinkage force coefficient, kkt is K resin component proportion correction coefficient.
2. The composite heat shrink film of claim 1, wherein: the slipping agent is silicon dioxide or kaolin.
3. The composite heat shrink film of claim 1, wherein: the total thickness of the composite heat-shrinkable film is 20-50 mu m; the thickness of the surface film layer is equal, and the total thickness of the surface film layer accounts for 10-20% of the total thickness of the composite heat-shrinkable film.
4. A production process of a composite heat-shrinkable film is characterized by comprising the following steps: the composite heat-shrinkable film is produced by adopting a three-layer coextrusion biaxial stretching process; the specific technical process comprises the following steps:
s1, extrusion tabletting: the surface film layer material and the core film layer material are fully dried and mixed, then are respectively placed in three screw extruders, are heated, stirred and melted into viscous fluid section by section, and are uniformly extruded into three laminar viscous fluids through three T-shaped die heads after being metered; wherein the T-shaped die corresponding to the core film layer is positioned in the middle of the T-shaped die corresponding to the surface film layer; wherein the extrusion temperature of the viscous fluid of the core film layer is 220-270 ℃; wherein the extrusion temperature of the surface film layer viscous fluid is 240-260 ℃; the three slice viscous fluids are combined into thick slice viscous fluid with a three-layer composite structure under the adsorption action of the electrostatic steel belt adsorption device, and are tightly attached to a chilling roller to be forcedly cooled into three-layer composite casting slices;
s2, longitudinal stretching: preheating the three-layer composite cast sheet to 80-90 ℃ by a plurality of rollers, and stretching the three-layer composite cast sheet in a longitudinal stretching chamber at a temperature of 100-115 ℃ to form a film at a multiplying power of 1.2-3 along the longitudinal direction; stretching longitudinally to form a film, and shaping for 2-5s at the temperature of 80-90 ℃;
s3, transversely stretching: transversely stretching the shaped longitudinal stretched film in a transverse stretching chamber at a temperature of 95-120 ℃ at a multiplying power of 3-5.5 in the transverse direction; shaping at 70-95 deg.c for 5-10s after transverse stretching;
S4, trimming and rolling: cutting edges of the transversely stretched composite heat-shrinkable film twice, cutting the transversely stretched composite heat-shrinkable film according to a set width specification, and finally rolling the transversely stretched composite heat-shrinkable film into a finished product of the composite heat-shrinkable film; the first trimming cuts off the edge part of the composite heat-shrinkable film clamped by the transverse stretching chain clamp, and the second trimming cuts off the on-line shrinkage force to continuously detect the sample.
5. The process for producing the composite heat shrinkable film according to claim 4, wherein the process comprises the steps of: the thickness control of the composite heat shrinkage film comprises total thickness control, surface film layer and core film layer thickness proportion double closed loop feedback control; the total thickness of the composite heat shrinkage film is controlled by controlling the quality of the total viscous fluid which is extruded by metering of a surface film layer and a core film layer screw extruder through actual thickness feedback detected by an online thickness detector; the thickness ratio of the surface film layer and the core film layer of the composite heat shrinkage film is controlled, and the mass ratio of the viscous fluid which is extruded by the screw extruder corresponding to the surface film layer and the core film layer is measured.
6. A shrinkage force control method of a composite heat shrinkage film is characterized by comprising the following steps: the shrinkage force on-line measuring device fixedly arranged on the side edge of the winding machine is used for detecting the relative shrinkage force of the composite heat-shrinkable film, and the thickness ratio of the surface film layer and the core film layer of the composite heat-shrinkable film is controlled through the measured relative shrinkage force feedback to control the shrinkage force of the finished product of the composite heat-shrinkable film.
7. The method for controlling the shrinkage force of the composite heat-shrinkable film according to claim 6, wherein the method comprises the following steps: the shrinkage force on-line measuring device comprises a bottom plate (1), a feeding traction roller set (2), a thermal shrinkage device (3) and a discharging traction roller set (4) which are sequentially and fixedly arranged on the bottom plate (1), wherein a dynamic torque sensor is arranged on the discharging traction roller set (4); the rotation speed of the feeding traction roller set (2) is the same as that of the discharging traction roller set (4), and the driving torque of the discharging traction roller set (4) is detected through a dynamic torque sensor to obtain the relative shrinkage force of the composite heat shrinkage film.
8. The method for controlling the shrinkage force of the composite heat-shrinkable film according to claim 7, wherein the method comprises the following steps: a magnetorheological fluid clutch is arranged on the discharging traction roller set (4); when the rotation speeds of the feeding traction roller set (2) and the discharging traction roller set (4) are synchronous, the relative shrinkage force of the composite heat shrinkage film is obtained through the working current of the magnetorheological fluid clutch.
9. The method for controlling the shrinkage force of the composite heat-shrinkable film according to claim 7 or 8, characterized by comprising the steps of: the corresponding relation between the relative shrinkage force of the composite heat shrinkage film and the heat shrinkage force of the composite heat shrinkage film finished product is obtained through experiments and is arranged in a production line control system.
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