CN117901390A - High-temperature-resistant label film product and preparation method thereof - Google Patents
High-temperature-resistant label film product and preparation method thereof Download PDFInfo
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- CN117901390A CN117901390A CN202410200620.3A CN202410200620A CN117901390A CN 117901390 A CN117901390 A CN 117901390A CN 202410200620 A CN202410200620 A CN 202410200620A CN 117901390 A CN117901390 A CN 117901390A
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- polypropylene
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- 238000004519 manufacturing process Methods 0.000 title claims description 5
- 238000002360 preparation method Methods 0.000 title abstract description 10
- 238000001816 cooling Methods 0.000 claims abstract description 33
- 239000004743 Polypropylene Substances 0.000 claims abstract description 29
- -1 polypropylene Polymers 0.000 claims abstract description 29
- 229920001155 polypropylene Polymers 0.000 claims abstract description 29
- 239000002344 surface layer Substances 0.000 claims abstract description 27
- 239000012792 core layer Substances 0.000 claims abstract description 16
- 239000010410 layer Substances 0.000 claims abstract description 16
- 238000012660 binary copolymerization Methods 0.000 claims abstract description 13
- 239000012775 heat-sealing material Substances 0.000 claims abstract description 12
- 238000009998 heat setting Methods 0.000 claims abstract description 11
- 238000004804 winding Methods 0.000 claims abstract description 10
- 238000003851 corona treatment Methods 0.000 claims abstract description 6
- 238000007334 copolymerization reaction Methods 0.000 claims abstract description 5
- 238000010791 quenching Methods 0.000 claims abstract description 5
- 230000000171 quenching effect Effects 0.000 claims abstract description 5
- 239000002305 electric material Substances 0.000 claims description 12
- 238000000034 method Methods 0.000 claims description 11
- 238000005096 rolling process Methods 0.000 claims description 10
- 239000000463 material Substances 0.000 claims description 9
- 239000012528 membrane Substances 0.000 claims description 4
- 239000003795 chemical substances by application Substances 0.000 claims description 3
- 238000002834 transmittance Methods 0.000 claims description 3
- 238000007789 sealing Methods 0.000 abstract description 4
- 238000001125 extrusion Methods 0.000 abstract description 3
- 238000012805 post-processing Methods 0.000 abstract description 3
- 239000010408 film Substances 0.000 description 85
- 238000010438 heat treatment Methods 0.000 description 7
- 238000002425 crystallisation Methods 0.000 description 5
- 230000008025 crystallization Effects 0.000 description 5
- 230000035882 stress Effects 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 229920000642 polymer Polymers 0.000 description 3
- 239000002994 raw material Substances 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- 150000002500 ions Chemical class 0.000 description 2
- 238000007639 printing Methods 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 239000010409 thin film Substances 0.000 description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 238000004887 air purification Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000004132 cross linking Methods 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 230000005489 elastic deformation Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 235000013305 food Nutrition 0.000 description 1
- 125000001183 hydrocarbyl group Chemical group 0.000 description 1
- 238000010030 laminating Methods 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 239000000178 monomer Substances 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 239000005022 packaging material Substances 0.000 description 1
- 239000003973 paint Substances 0.000 description 1
- 230000000379 polymerizing effect Effects 0.000 description 1
- 239000011241 protective layer Substances 0.000 description 1
- 229910052761 rare earth metal Inorganic materials 0.000 description 1
- 150000002910 rare earth metals Chemical class 0.000 description 1
- 230000002194 synthesizing effect Effects 0.000 description 1
- 238000009966 trimming Methods 0.000 description 1
- 238000012800 visualization Methods 0.000 description 1
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- Shaping By String And By Release Of Stress In Plastics And The Like (AREA)
Abstract
The invention relates to the technical field of films, and provides a preparation method of a high-temperature-resistant label film product, which comprises a label film body and is characterized in that the label film body sequentially comprises an upper surface layer, a core layer and a lower surface layer from top to bottom, wherein the upper surface layer is formed by binary copolymerization heat sealing, the core layer is a main extrusion layer, the core layer is made of high-isotacticity polypropylene, and the lower surface layer is formed by copolymerization heat sealing materials. The invention also provides a special product for efficient in-mold adhesion and a preparation method thereof, comprising the following steps: s1, chilling treatment: quenching the cast sheet by a chilled roll to extrude polypropylene into a film; s2, longitudinal stretching; s3, transversely stretching; s4, heat setting treatment; s5, cooling treatment; s6, pulling a cooling roller; s7, stretching and flattening; s8, corona treatment; s9, film pulling and winding. The invention can fully and directionally arrange and shape the polypropylene molecular chains, reduce the retraction deformation of the molecular chains in the post-processing, thereby improving the high temperature resistance.
Description
Technical Field
The invention relates to a high-temperature-resistant label film product and a preparation method thereof, and belongs to the technical field of films.
Background
The label film is commonly used as a packaging material of various foods and daily necessities, is mainly used as a shrink sleeve, a full-seal label, a bottle cap seal and the like, and has better laminating degree, higher transparency and better visualization effect compared with the traditional label material; meanwhile, the paint also has better glossiness and wear resistance, and has been widely used in recent years. The label film is required to be coated and processed, the processing process bears the oven temperature of 100-110 ℃ and the drawing tension, and the thermal deformation temperature of the common polypropylene is about 120 ℃. The Chinese patent No. CN202210168646.5 discloses an environment-friendly tracing PVC heat shrinkage label film and a preparation method thereof, which can prevent the effect of continuous tracing from being achieved due to uneven dispersion because less rare earth inorganic fluorescent tracing material is added by synthesizing silicon dioxide powder containing fluorescent components; the Chinese patent No. CN202211648961.4 discloses a wear-resistant label film and a preparation method thereof, which can protect a printing surface through a protective layer to prevent the character information or the pattern on the printing surface from being damaged by friction.
However, the inventors of the present invention found that the prior art had the following problems: the label film is easily pulled and deformed during the heating process, and the shrinkage, the surface heating and the molecular chain retraction cause unevenness, thereby affecting the coating process and the subsequent use, and therefore, improvement is required.
Disclosure of Invention
In order to solve the technical problems, the invention provides a high-temperature-resistant label film product and a preparation method thereof, which can reduce the retraction deformation of a molecular chain during post-processing, thereby improving the high-temperature resistance.
The invention is realized by the following technical scheme.
The invention provides a high-temperature-resistant label film product, which comprises a label film body, wherein the label film body sequentially comprises an upper surface layer, a core layer and a lower surface layer from top to bottom, the upper surface layer is subjected to binary copolymerization heat sealing, the core layer is a main extrusion layer, the core layer is made of high-isotacticity polypropylene, and the lower surface layer is subjected to copolymerization heat sealing.
The thickness of the upper surface layer is 1.0-1.15 mu m, the thickness of the core layer is 45.05 mu m, and the thickness of the lower surface layer is 1.6-1.8 mu m.
The weight ratio of the upper surface layer to the core layer to the lower surface layer is 97-98 parts of binary copolymerization heat sealing material: 100 parts of high isotacticity polypropylene: 96-98 parts of binary copolymerization heat sealing material, wherein 196-98 parts of binary copolymerization heat sealing material is uniformly mixed with 2.0-4.0 parts of anti-connecting agent.
The elastic modulus of the label film body is not less than 2200Pa, the longitudinal tensile strength is not less than 120Mpa, and the transverse tensile strength is not less than 220Mpa; haze no more than 2.5%; the light transmittance is not less than 80%, the longitudinal fracture nominal strain is not more than 200, and the transverse fracture nominal strain is not more than 65.
The friction coefficient between the electric material and the electric material in the label film body is not more than 0.8, the friction coefficient between the non-electric material and the non-electric material is not more than 0.8, the longitudinal heat shrinkage rate is 2.0% at 120 ℃, and the transverse heat shrinkage rate is avoided; the longitudinal heat shrinkage rate is 2.5% at 130 ℃, and the transverse heat shrinkage rate is avoided; the heat shrinkage in the machine direction at 140℃was 4.0% and the heat shrinkage in the transverse direction was 1%.
The invention also provides a preparation method of the high-temperature-resistant label film product, which is used for preparing the high-temperature-resistant label film product and comprises the following steps of:
s1, chilling treatment: quenching the cast sheet by a chilled roll to extrude polypropylene into a film;
S2, longitudinal stretching: softening and stretching the polypropylene film by using a preheating roller and a stretching roller in sequence, wherein the temperature of the stretching roller is lower than that of the preheating roller;
S3, transversely stretching: transversely stretching the film-formed polypropylene at a stretching temperature at least 10 ℃ higher than the stretching temperature in step S2;
s4, heat setting treatment: performing heat setting treatment on the film-formed polypropylene at a temperature of not higher than 167 ℃;
S5, cooling treatment: cooling the film-formed polypropylene to a film at a temperature of not more than 60 ℃;
s6, drawing a cooling roller: pulling the cooling roller to enable the cooling roller to travel along the surface of the film so as to reduce the surface temperature of the film;
s7, stretching and flattening: adjusting the tensile stress to eliminate longitudinal stripes of the film;
S8, corona treatment: corona treating the film with a corona roller to activate the film surface;
s9, film drawing and rolling: and (3) taking out the film by using a film drawing machine and rolling, wherein a speed difference exists between the speed of the film drawing machine and the linear speed of the surface of the winding core, and the surface of the winding core is pressed down in the rolling process to remove air.
The transverse stretching temperature in the step S3 is 15-25 ℃ higher than the stretching temperature in the step S2.
In the step S4, the heat setting treatment is carried out at 145-165 ℃ for 3-6 seconds.
In the step S5, the cooling residence time is 1 to 4 seconds.
In the step S6, the temperature of the drawn cooling roll is 30 ℃.
The invention has the beneficial effects that: the high-isotacticity raw material is selected to be used as a surface layer, and the high-tensile ratio and the high processing temperature are adopted to lead the polypropylene molecular chains to be fully and directionally arranged and shaped, so that the retraction deformation of the molecular chains in the post processing is reduced, and the high-temperature resistance is improved; the production efficiency can be improved by 10%, the energy consumption is saved, the label is enabled to be more vigorous and bright, and the display effect is enhanced.
Drawings
FIG. 1 is a flow chart of at least one embodiment of the present invention.
Detailed Description
The technical solution of the present invention is further described below, but the scope of the claimed invention is not limited to the above.
The first embodiment of the invention relates to a preparation method of a high-temperature-resistant label film product shown in fig. 1, which comprises a label film body, wherein the label film body sequentially comprises an upper surface layer, a core layer and a lower surface layer from top to bottom, the upper surface layer is formed by binary copolymerization heat sealing, the core layer is a main extrusion layer, the core layer is made of high-isotacticity polypropylene, and the lower surface layer is formed by copolymerization heat sealing materials. The upper surface layer is an auxiliary layer, the core layer is a main layer, the lower surface layer is an auxiliary layer, and the copolymerization heat sealing material is a material with heat bonding performance formed by polymerizing polypropylene and other monomers; the higher the isotacticity of polypropylene, the higher the crystallinity of polypropylene, and the better the properties such as melting point, tensile strength, flexural modulus, impact strength, etc.
The thickness of the upper surface layer is 1.0-1.15 mu m, the thickness of the core layer is 45.05 mu m, and the thickness of the lower surface layer is 1.6-1.8 mu m. In order to achieve a uniform roughened surface, the top layer of the label film must be maintained at a suitable thickness.
The weight ratio of the upper surface layer, the core layer and the lower surface layer is 97-98 parts of binary copolymerization heat sealing material: 100 parts of high isotacticity polypropylene: 96-98 parts of binary copolymerization heat sealing material, wherein 196-98 parts of binary copolymerization heat sealing material is uniformly mixed with 2.0-4.0 parts of anti-connecting agent. Different kinds of films can be produced by different material proportions, and films with the same kind but different properties can be produced by the same material proportion.
The elastic modulus of the label film body is not less than 2200Pa, the longitudinal tensile strength is not less than 120Mpa, and the transverse tensile strength is not less than 220Mpa; haze no more than 2.5%; the light transmittance is not less than 80%, the longitudinal fracture nominal strain is not more than 200, and the transverse fracture nominal strain is not more than 65. The elastic modulus is a measure of the ability of an object to resist elastic deformation; tensile strength is an important indicator for measuring the durability and strength of a material; the strain at break is used to describe the extent of deformation of a substance prior to failure.
The friction coefficient between the electric material and the electric material in the label film body is not more than 0.8, the friction coefficient between the non-electric material and the non-electric material is not more than 0.8, the longitudinal heat shrinkage rate is 2.0% at 120 ℃, and the transverse heat shrinkage rate is avoided; the longitudinal heat shrinkage rate is 2.5% at 130 ℃, and the transverse heat shrinkage rate is avoided; the heat shrinkage in the machine direction at 140℃was 4.0% and the heat shrinkage in the transverse direction was 1%. The coefficient of friction refers to the ratio of the friction between two surfaces to the normal force acting on one of the surfaces. It is related to the roughness of the surface, and not to the size of the contact area. The performance index such as haze and gloss of the label film is excellent when the heat shrinkage rate is low. The thermal shrinkage of the film is used for characterizing the dimensional stability of the film under the condition of heating and reflecting the temperature resistance of the film.
The second embodiment of the present invention relates to a method for preparing a high temperature resistant label film product, for preparing the first embodiment, comprising the steps of:
s1, chilling treatment: quenching the cast sheet by a chilled roll to extrude polypropylene into a film; the problem of different cooling speeds of the two sides can exist in the quenching process of the chilling roller, so that huge crystalline state difference and density difference can occur on the two sides; the sheet is also subject to warping, uneven cooling or preheating, so that stretching is difficult;
S2, longitudinal stretching: softening and stretching the polypropylene film by using a preheating roller and a stretching roller in sequence, wherein the temperature of the stretching roller is lower than that of the preheating roller; the greater the draw ratio, the greater the degree of molecular orientation of the film; the stretching ratio is too high, so that the probability of rupture of the film during transverse stretching of the film is increased; too low a draw ratio, in addition to affecting the mechanical properties of the film, can also give rise to increased longitudinal thickness tolerance fluctuations;
S3, transversely stretching: transversely stretching the film-formed polypropylene at a stretching temperature at least 10 ℃ higher than the stretching temperature in step S2; the temperature depends on the thickness of the raw materials and the products, and is also related to the stretching ratio and the stretching setting, and the preheating, stretching area and transverse heating temperature are uniform and stable;
S4, heat setting treatment: performing heat setting treatment on the film-formed polypropylene at a temperature of not higher than 167 ℃; the heat treatment accelerates the secondary crystallization or crystallization process of the polymer;
S5, cooling treatment: cooling the film-formed polypropylene to a film at a temperature of not more than 60 ℃; the cooling process mainly refers to cooling temperature, cooling time, cooling air purification and the like;
s6, drawing a cooling roller: pulling the cooling roller to enable the cooling roller to travel along the surface of the film so as to reduce the surface temperature of the film;
S7, stretching and flattening: adjusting the tensile stress to eliminate longitudinal stripes of the film; eliminating longitudinal stripes generated by the film before traction, thickness gauge, trimming, corona treatment and rolling under tensile stress;
S8, corona treatment: corona treating the film with a corona roller to activate the film surface; the high-energy electrons and ions bombard the surface of the film to break chain molecules on the surface of the film, free radicals generated during chain breaking react with corona products in the air in an oxidation and crosslinking way to enable corona on the surface of the film to generate polar groups, the surface of the film is activated, part of ions are implanted into the film to coarsen the surface, and the surface tension of the film is increased. The surface of the film after corona treatment becomes a polar substance completely different from the original hydrocarbon structure, and the free energy of the surface is greatly improved;
S9, film drawing and rolling: and (3) taking out the film by using a film drawing machine and rolling, wherein a speed difference exists between the speed of the film drawing machine and the linear speed of the surface of the winding core, and the surface of the winding core is pressed down in the rolling process to remove air. The tension is the force that tightens the film, and its magnitude depends on the difference between the linear speed of the winding core surface and the film-out speed of the film pulling machine. The pressure is essentially such that excess air trapped during the winding process is removed to maintain a proper space between the film layers so that the film has a shrink margin during the aging process. Too much pressure will cause the film to stick together and unfavorably slit with large, too little pressure, too much air is taken up by the film roll, and film roll unwinding and longitudinal streaking tend to occur.
The third embodiment of the present invention is substantially identical to the second embodiment, mainly consisting in a further optimization of the details of the steps. The transverse stretching temperature in the step S3 is 15-25 ℃ higher than the stretching temperature in the step S2. The temperature is too low, and the phenomena of clamping removal and membrane rupture easily occur in the production process. The film can have larger thickness fluctuation and increased haze when the temperature is too high, and can also have film rupture phenomenon when the film is serious. The temperature depends on the thickness of the raw material and the product, and also depends on the stretching ratio and the stretching setting. The stretching temperature of the thin film is lower than that of the thin film with a larger thickness, the stretching speed is high, and the stretching temperature is correspondingly increased. The temperature distribution of the stretching area is also important, the temperature of the preheating and stretching area is preheated, and the transverse heating temperature is required to be uniform and stable. The temperature of the stretch zone is typically increased by a number of increments.
In the step S4, the heat setting treatment is carried out at 145-165 ℃ for 3-6 seconds. The purposes of heat setting of different materials are different, and for crystalline polymers, the heat treatment accelerates the secondary crystallization or crystallization process of the polymer, so that the molecular chain orientation is converted into the crystallization orientation, the internal stress of the film is eliminated, the crystallinity is improved, the crystal structure tends to be perfect, and the heat shrinkage rate of the film is reduced.
In step S5, the cooling residence time is 1 to 4 seconds. Cooling is to prevent the film from accelerating creep at high temperatures, which would affect the film's performance. The thicker the thickness, the longer the film residence time. The film is forcedly cooled, and low molecular substances sublimated from the film are condensed, so that greasy dirt on a cooling section appears.
In step S6, the temperature of the drawn cooling roll is 30 ℃. The surface temperature of the film after the cooling stage is still 50 degrees or more, and if the film is wound on the winding core, the product may be deformed or stuck together, and the surface temperature of the film needs to be taken away by pulling each cooling roller.
Claims (10)
1. The utility model provides a high temperature resistant label membrane product, includes the label membrane body, its characterized in that, label membrane body from the top down comprises top layer, sandwich layer and lower top layer in proper order, and the top layer is binary copolymerization heat seal, and the sandwich layer is the crowded layer of owner, and the sandwich layer material is high isotacticity polypropylene, and the lower top layer is copolymerization heat seal material.
2. The high temperature resistant label film product of claim 1, wherein: the thickness of the upper surface layer is 1.0-1.15 mu m, the thickness of the core layer is 45.05 mu m, and the thickness of the lower surface layer is 1.6-1.8 mu m.
3. The high temperature resistant label film product of claim 2, wherein: the weight ratio of the upper surface layer to the core layer to the lower surface layer is 97-98 parts of binary copolymerization heat sealing material: 100 parts of high isotacticity polypropylene: 96-98 parts of binary copolymerization heat sealing material, wherein 196-98 parts of binary copolymerization heat sealing material is uniformly mixed with 2.0-4.0 parts of anti-connecting agent.
4. The high temperature resistant label film product of claim 2, wherein: the elastic modulus of the label film body is not less than 2200Pa, the longitudinal tensile strength is not less than 120Mpa, and the transverse tensile strength is not less than 220Mpa; haze no more than 2.5%; the light transmittance is not less than 80%, the longitudinal fracture nominal strain is not more than 200, and the transverse fracture nominal strain is not more than 65.
5. The high temperature resistant label film product of claim 2, wherein: the friction coefficient between the electric material and the electric material in the label film body is not more than 0.8, the friction coefficient between the non-electric material and the non-electric material is not more than 0.8, the longitudinal heat shrinkage rate is 2.0% at 120 ℃, and the transverse heat shrinkage rate is avoided; the longitudinal heat shrinkage rate is 2.5% at 130 ℃, and the transverse heat shrinkage rate is avoided; the heat shrinkage in the machine direction at 140℃was 4.0% and the heat shrinkage in the transverse direction was 1%.
6. A method for preparing a high temperature resistant label film product according to any one of claims 1 to 5, comprising the steps of:
s1, chilling treatment: quenching the cast sheet by a chilled roll to extrude polypropylene into a film;
S2, longitudinal stretching: softening and stretching the polypropylene film by using a preheating roller and a stretching roller in sequence, wherein the temperature of the stretching roller is lower than that of the preheating roller;
S3, transversely stretching: transversely stretching the film-formed polypropylene at a stretching temperature at least 10 ℃ higher than the stretching temperature in step S2;
s4, heat setting treatment: performing heat setting treatment on the film-formed polypropylene at a temperature of not higher than 167 ℃;
S5, cooling treatment: cooling the film-formed polypropylene to a film at a temperature of not more than 60 ℃;
s6, drawing a cooling roller: pulling the cooling roller to enable the cooling roller to travel along the surface of the film so as to reduce the surface temperature of the film;
s7, stretching and flattening: adjusting the tensile stress to eliminate longitudinal stripes of the film;
S8, corona treatment: corona treating the film with a corona roller to activate the film surface;
s9, film drawing and rolling: and (3) taking out the film by using a film drawing machine and rolling, wherein a speed difference exists between the speed of the film drawing machine and the linear speed of the surface of the winding core, and the surface of the winding core is pressed down in the rolling process to remove air.
7. The method of producing a high temperature resistant label film product according to claim 6, wherein the transverse stretching temperature in step S3 is 15 to 25 ℃ higher than the stretching temperature in step S2.
8. The method of producing a heat-resistant label film according to claim 6, wherein in the step S4, the heat-setting treatment is performed at 145 to 165 ℃ for 3 to 6 seconds.
9. The method for producing a heat resistant label film product according to claim 6, wherein the cooling residence time in step S5 is 1 to 4 seconds.
10. The method of producing a high temperature resistant label film product according to claim 6, wherein in step S6, the temperature of the drawn cooling roll is 30 ℃.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410200620.3A CN117901390A (en) | 2024-02-23 | 2024-02-23 | High-temperature-resistant label film product and preparation method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410200620.3A CN117901390A (en) | 2024-02-23 | 2024-02-23 | High-temperature-resistant label film product and preparation method thereof |
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| Publication Number | Publication Date |
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| CN117901390A true CN117901390A (en) | 2024-04-19 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202410200620.3A Pending CN117901390A (en) | 2024-02-23 | 2024-02-23 | High-temperature-resistant label film product and preparation method thereof |
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| Country | Link |
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| CN (1) | CN117901390A (en) |
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