CN115091832A - High-transparency polyester heat shrinkable film and preparation method thereof - Google Patents
High-transparency polyester heat shrinkable film and preparation method thereof Download PDFInfo
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- CN115091832A CN115091832A CN202210802776.XA CN202210802776A CN115091832A CN 115091832 A CN115091832 A CN 115091832A CN 202210802776 A CN202210802776 A CN 202210802776A CN 115091832 A CN115091832 A CN 115091832A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/36—Layered products comprising a layer of synthetic resin comprising polyesters
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
- B29B9/00—Making granules
- B29B9/02—Making granules by dividing preformed material
- B29B9/06—Making granules by dividing preformed material in the form of filamentary material, e.g. combined with extrusion
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/001—Combinations of extrusion moulding with other shaping operations
- B29C48/0018—Combinations of extrusion moulding with other shaping operations combined with shaping by orienting, stretching or shrinking, e.g. film blowing
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
- B29C48/07—Flat, e.g. panels
- B29C48/08—Flat, e.g. panels flexible, e.g. films
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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
- B29C48/16—Articles comprising two or more components, e.g. co-extruded layers
- B29C48/18—Articles comprising two or more components, e.g. co-extruded layers the components being layers
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
- B32B27/08—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/18—Layered products comprising a layer of synthetic resin characterised by the use of special additives
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2250/00—Layers arrangement
- B32B2250/03—3 layers
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2250/00—Layers arrangement
- B32B2250/24—All layers being polymeric
- B32B2250/244—All polymers belonging to those covered by group B32B27/36
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2250/00—Layers arrangement
- B32B2250/40—Symmetrical or sandwich layers, e.g. ABA, ABCBA, ABCCBA
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2307/00—Properties of the layers or laminate
- B32B2307/40—Properties of the layers or laminate having particular optical properties
- B32B2307/412—Transparent
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2307/00—Properties of the layers or laminate
- B32B2307/50—Properties of the layers or laminate having particular mechanical properties
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2307/00—Properties of the layers or laminate
- B32B2307/70—Other properties
- B32B2307/732—Dimensional properties
- B32B2307/734—Dimensional stability
- B32B2307/736—Shrinkable
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Manufacture Of Macromolecular Shaped Articles (AREA)
Abstract
The invention discloses a high-transparency polyester heat shrinkable film and a preparation method thereof, and the technical scheme is characterized in that the film layer structure of the high-transparency heat shrinkable film is an A/B/A three-layer structure; wherein the raw materials of the layer A comprise PETG polyester chips, a chain extender and an opening agent; the raw materials of the layer B comprise PETG and PET polyester chips. The method is simple and easy to implement, does not need to add a large amount of crystallization inhibitors and the like, and saves the cost compared with the traditional method for replacing the optical-grade raw materials with higher cost.
Description
Technical Field
The invention belongs to the field of processing of new high-molecular materials, and particularly relates to a high-transparency polyester heat shrinkable film and a preparation method thereof.
Background
The heat shrinkable film is a special functional film which can shrink after being heated, and is widely applied to skin packaging of products such as food, drink, daily chemicals, toys and the like due to excellent mechanical property and good shrinking effect so as to show good image of the products. At present, materials such as polystyrene (OPS), polyvinyl chloride (PVC), modified polyethylene terephthalate glycol (PETG) and the like are mostly selected as materials of the heat shrinkable film, wherein the PETG heat shrinkable film is widely used due to the advantages of high heat shrinkage rate, excellent strength performance, good environmental protection performance, suitability for printing and the like.
Because the PETG raw material has certain crystallization performance, certain crystallization can be generated in the processing process, so that the transparency of the heat shrinkable film is deteriorated, and certain application scenes needing high transparency cannot be met. By adjusting the setting temperature, the degree of adjustment of the crystallization properties is limited. Therefore, the invention provides a processing method for improving the transparency of a PETG heat shrinkable film, which uses common PETG slices with low price and wide sources, can still have higher transparency after film forming through a special processing mode, and greatly reduces the cost.
Disclosure of Invention
The invention aims to solve the problem that the transparency of the film is poor because the polyester film is easy to crystallize to a certain degree during stretching in the prior art.
Therefore, the invention provides a high-transparency polyester heat shrinkable film, which has an A/B/A three-layer structure; wherein the raw materials of the layer A comprise PETG polyester chips, a chain extender and an opening agent; the raw materials of the layer B comprise PETG and PET polyester chips.
Specifically, the raw materials of the layer A comprise 100 parts by weight of PETG polyester chips, 1-2 parts by weight of chain extender and 1-3 parts by weight of opening agent; the raw materials of the layer B comprise 100 parts of PETG polyester chip and 1-20 parts of PET polyester chip by mass.
Specifically, the opening agent comprises at least one of nano silicon dioxide and erucamide.
Specifically, the chain extender includes at least one of phthalic anhydride and pyromellitic dianhydride.
Specifically, the mass ratio of each layer in the A/B/A three-layer structure is A: b: a is 1: 1-10: 1.
the invention also provides a preparation method of the high-transparency polyester heat shrinkable film, which comprises the following steps:
1) putting the PETG polyester chips, the chain extender and the opening agent into high-speed mixing equipment, and stirring and mixing to obtain a layer A mixed material;
2) putting the PETG polyester slices and the PET polyester slices into high-speed mixing equipment, stirring and mixing, putting into a double-screw extruder, and extruding and granulating to obtain a B layer material;
3) putting the A layer of mixed material into an auxiliary extruder screw of three-layer co-extrusion double-drawing equipment for melting and plasticizing, putting the B layer of mixed material into a main extruder screw of the three-layer co-extrusion double-drawing equipment for melting and plasticizing, adjusting the mass ratio of each layer through extruder rotating speed equipment, and preparing the high-transparency polyester heat-shrinkable film with the A/B/A three-layer structure through tape casting and bidirectional stretching in sequence; in the stretching process, the temperature of the final shaping area is controlled within 65-82 ℃ by adopting a mode of continuously or stepwisely reducing the temperature of the shaping area.
The continuous way of reducing the temperature of the setting area is that: in the shaping process of the PETG heat shrinkable film, the uniform temperature drop of 0.5-3 ℃/1-5m is carried out on a shaping area, and finally the temperature of the shaping area is maintained within the range of 82 ℃ at an inlet and 65 ℃ at an outlet; or, at any stage in the shaping process, the temperature of the shaping area is continuously and uniformly reduced, wherein the temperature of the inlet is 82 ℃ and the temperature of the outlet is 65 ℃.
The step of reducing the temperature of the setting area in a batch mode is that: in the shaping process of the PETG heat shrinkable film, a shaping area is divided into more than eight sections at equal intervals, the length of each section is ensured to be more than 1 meter, the temperature difference is ensured to be within the range of 1-3 ℃, and finally the temperature of the shaping area is maintained within the range of 82 ℃ at an inlet and 65 ℃ at an outlet.
The invention has the advantages that:
on the basis of the existing PETG heat-shrinkable preparation method, a novel shrinkable film preparation method and a novel process are provided. Particularly, a new sizing process in the transverse stretching process is provided, the crystallization of materials in the stretching process is inhibited, the high transparency and the high strength of the heat shrinkable film are realized, the molecular conformation is changed by further changing the surface layer formula and adding a chain extender, the irregularity is increased, and the transparency of the heat shrinkable film is further improved. The method is simple and easy to implement, does not need to add a large amount of crystallization inhibitors and the like, and saves the cost compared with the traditional method for replacing the optical-grade raw materials with higher cost.
DETAILED DESCRIPTION OF EMBODIMENT (S) OF INVENTION
The effect of the high transparency heat shrinkable film of the present invention will be examined by specific examples.
Example 1:
1) weighing a layer A raw material and a layer B raw material according to the mass parts, wherein the layer A raw material comprises: 98 parts of PETG slices, 1 part of opening agent nano silicon dioxide and 1 part of chain extender pyromellitic dianhydride; the layer B comprises the following raw materials: 100 parts of PETG slices and 10 parts of PET slices;
2) placing the raw material of the layer A into high-speed mixing equipment, and stirring at normal temperature of 800rpm for 5min to obtain a mixed material of the layer A;
3) putting the raw materials of the layer B into high-speed mixing equipment, and stirring for 5min at 800rpm to obtain a mixed material of the layer B;
4) respectively carrying out melt plastication on the mixed material of the layer A and the layer B in an auxiliary extruder screw and a main extruder screw of three-layer co-extrusion double-drawing equipment, adjusting the mass ratio of each layer through extruder rotating speed equipment, then preparing the high-transparency polyester heat shrinkable film with the layer A/B/A structure through tape casting and bidirectional drawing in sequence, adjusting the mass ratio of each layer through extruder rotating speed equipment, and then preparing the high-transparency polyester heat shrinkable film with the layer A/B/A structure of 1:8:1 through tape casting and bidirectional drawing in sequence. Wherein the TDO setting temperature is set according to the temperature drop of 0.5 ℃/1 m.
The haze and the transmittance of the PETG heat shrinkable film measured by an optical performance tester of Germany BYK are respectively 2.1 and 89.
Example 2:
this embodiment is not described again in detail in the same places as embodiment 1, and the differences from embodiment 1 are: 97 parts of PETG slices, 2 parts of opening agent nano silicon dioxide and 1 part of chain extender pyromellitic dianhydride in the step 1).
The haze and the transmittance of the PETG heat shrinkable film measured by an optical performance tester of German BYK are respectively 2.0 and 88.
Example 3:
this embodiment is not described again in detail in the same places as embodiment 1, and the differences from embodiment 1 are: setting the TDO setting temperature in the step 4) according to the temperature drop of 1 ℃/1 m.
The haze and the light transmittance of the PETG heat shrinkable film are respectively 1.9 and 90.5 measured by an optical performance tester of Germany BYK.
Example 4:
this embodiment will not be described again in the same places as embodiment 1, and the differences from embodiment 1 are: the TDO setting temperature in the step 4) is set according to the temperature drop of 1.5 ℃/1 m.
The haze and the light transmittance of the PETG heat shrinkable film are respectively 2.0 and 88.3 by using an optical performance tester of Germany BYK.
Example 5:
this embodiment is not described again in detail in the same places as embodiment 1, and the differences from embodiment 1 are: setting the TDO setting temperature in the step 4) according to the temperature drop of 2 ℃/1 m.
The haze and the transmittance of the PETG heat shrinkable film are respectively 2.1 and 88.3 measured by an optical performance tester of German BYK.
Example 6:
this embodiment will not be described again in the same places as embodiment 1, and the differences from embodiment 1 are: the TDO setting temperature in the step 4) is set according to the temperature drop of 2.5 ℃/1 m.
The haze and the transmittance of the PETG heat shrinkable film measured by an optical performance tester of German BYK are respectively 1.8 and 93.
Example 7:
this embodiment will not be described again in the same places as embodiment 1, and the differences from embodiment 1 are: setting the TDO setting temperature in the step 4) according to the temperature drop of 3 ℃/1 m.
The haze and the light transmittance of the PETG heat shrinkable film are respectively 1.9 and 90.6 measured by an optical performance tester of Germany BYK.
Example 8:
this embodiment will not be described again in the same places as embodiment 1, and the differences from embodiment 1 are: and in the step 4), the TDO setting temperature is set according to the temperature drop of 0.5 ℃/2 m.
The haze and the transmittance of the PETG heat shrinkable film measured by an optical performance tester of German BYK are respectively 1.8 and 92.
Example 9:
this embodiment is not described again in detail in the same places as embodiment 1, and the differences from embodiment 1 are: setting the TDO setting temperature in the step 4) according to the temperature drop of 0.5 ℃/3 m.
The haze and the light transmittance of the PETG heat shrinkable film are respectively 1.9 and 91 measured by an optical performance tester of Germany BYK.
Example 10:
this embodiment is not described again in detail in the same places as embodiment 1, and the differences from embodiment 1 are: setting the TDO setting temperature in the step 4) according to the temperature drop of 0.5 ℃/4 m.
The haze and the transmittance of the PETG heat shrinkable film measured by an optical performance tester of Germany BYK are respectively 2.2 and 91.
Example 11:
this embodiment is not described again in detail in the same places as embodiment 1, and the differences from embodiment 1 are: setting the TDO setting temperature in the step 4) according to the temperature drop of 0.5 ℃/5 m.
The haze and the transmittance of the PETG heat shrinkable film measured by an optical performance tester of German BYK are respectively 2.3 and 87.
Example 12:
1) weighing a layer A raw material and a layer B raw material according to the mass parts, wherein the layer A raw material comprises: 98 parts of PETG slices, 1 part of opening agent nano silicon dioxide and 1 part of chain extender phthalic anhydride; the layer B comprises the following raw materials: 100 parts of PETG slices and 10 parts of PET slices;
2) placing the raw material of the layer A into high-speed mixing equipment, and stirring at normal temperature of 800rpm for 5min to obtain a mixed material of the layer A;
3) putting the raw materials of the layer B into high-speed mixing equipment, and stirring for 5min at 800rpm to obtain a mixed material of the layer B;
4) respectively carrying out melt plasticization on the mixed material of the layer A and the layer B in an auxiliary extruder screw and a main extruder screw of a three-layer co-extrusion double-drawing device, adjusting the mass ratio of each layer through an extruder rotating speed device, then carrying out tape casting and bidirectional drawing in sequence to prepare the high-transparency polyester heat-shrinkable film with the layer A/B/A structure, adjusting the mass ratio of each layer through the extruder rotating speed device, and then carrying out tape casting and bidirectional drawing in sequence to prepare the high-transparency polyester heat-shrinkable film with the layer A/B/A structure of 1:8: 1. Wherein, the TDO fixed area is divided into eight sections, and the temperatures of the sections from the inlet to the outlet are respectively set to 82 ℃, 80 ℃, 78 ℃, 76 ℃, 74 ℃, 72 ℃, 70 ℃, 68 ℃ and 65 ℃.
The haze and the transmittance of the PETG heat shrinkable film are respectively 1.9 and 91 measured by an optical performance tester of German BYK.
Example 13:
this embodiment is not described again in detail in the same places as embodiment 12, and the differences from embodiment 12 are: 97 parts of PETG slices, 2 parts of opening agent nano silicon dioxide and 1 part of chain extender pyromellitic dianhydride in the step 1).
The haze and the light transmittance of the PETG heat shrinkable film are respectively 2.1 and 86 by using a German BYK optical performance tester.
Example 14:
this embodiment is not described again in detail in the same places as embodiment 12, and the differences from embodiment 12 are: in the step 4), the TDO setting area is divided into eight sections, and the temperatures of the sections from the inlet to the outlet are respectively set to 82 ℃, 81 ℃, 80 ℃, 79 ℃, 76 ℃, 73 ℃, 70 ℃, 67 ℃ and 65 ℃.
The haze and the light transmittance of the PETG heat shrinkable film are respectively 1.9 and 90.8 measured by an optical performance tester of Germany BYK.
Example 15:
this embodiment is not described again in detail in the same places as embodiment 12, and the differences from embodiment 12 are: the TDO typing zone in the step 4) is divided into seventeen sections, and the temperatures of the sections from the inlet to the outlet are respectively set to 82 ℃, 81 ℃, 80 ℃, 79 ℃, 78 ℃, 77 ℃, 76 ℃, 75 ℃, 74 ℃, 73 ℃, 72 ℃, 71 ℃, 70 ℃, 69 ℃, 68 ℃, 67 ℃, 66 ℃ and 65 ℃.
The haze and the transmittance of the PETG heat shrinkable film are respectively 1.9 and 91 measured by an optical performance tester of German BYK.
Comparative example:
1) weighing a layer A raw material and a layer B raw material according to the mass parts, wherein the layer A raw material comprises: 99 parts of PETG slices and 1 part of opening agent nano silicon dioxide; the layer B comprises the following raw materials: 100 parts of PETG slices and 10 parts of PET slices;
2) placing the raw material of the layer A into high-speed mixing equipment, and stirring at normal temperature of 800rpm for 5min to obtain a mixed material of the layer A;
3) putting the raw materials of the layer B into high-speed mixing equipment, and stirring for 5min at 800rpm to obtain a mixed material of the layer B;
4) respectively carrying out melt plasticization on the mixed material of the layer A and the layer B in an auxiliary extruder screw and a main extruder screw of a three-layer co-extrusion double-drawing device, adjusting the mass ratio of each layer through an extruder rotating speed device, then carrying out tape casting and bidirectional drawing in sequence to prepare the high-transparency polyester heat-shrinkable film with the layer A/B/A structure, adjusting the mass ratio of each layer through the extruder rotating speed device, and then carrying out tape casting and bidirectional drawing in sequence to prepare the high-transparency polyester heat-shrinkable film with the layer A/B/A structure of 1:8: 1. Wherein the TDO setting temperature is set in a single section at 70 ℃.
The haze and the transmittance of the PETG heat shrinkable film are respectively 4.1 and 80.2 measured by an optical performance tester of German BYK.
The above examples are merely illustrative of the present invention and do not limit the scope of the present invention, and it should be noted that the description of the embodiments is provided for the understanding of the present invention, but not for the limitation of the present invention. In addition, the technical features related to the embodiments of the present invention described above may be combined with each other as long as they do not conflict with each other. In addition, the above embodiments are only some embodiments of the present invention, not all embodiments, and all other embodiments obtained by those skilled in the art based on the embodiments of the present invention without any creative work belong to the protection scope of the present invention.
Claims (8)
1. A high-transparency polyester heat shrinkable film is characterized in that: the film layer structure of the high-transparency heat shrinkable film is an A/B/A three-layer structure; wherein the raw materials of the layer A comprise PETG polyester chips, a chain extender and an opening agent; the raw materials of the layer B comprise PETG and PET polyester chips.
2. The high transparent polyester heat shrinkable film of claim 1, wherein: the raw materials of the layer A comprise 100 parts of PETG polyester chip, 1-2 parts of chain extender and 1-3 parts of opening agent by mass; the raw materials of the layer B comprise 100 parts of PETG polyester chip and 1-20 parts of PET polyester chip by mass.
3. The high transparent polyester heat shrinkable film of claim 1, wherein: the opening agent comprises at least one of nano-silica and erucamide.
4. The high transparent polyester heat shrinkable film of claim 1, wherein: the chain extender comprises at least one of phthalic anhydride and pyromellitic dianhydride.
5. A highly transparent polyester heat shrinkable film according to claim 1, wherein: the mass ratio of each layer in the A/B/A three-layer structure is A: b: a is 1: 1-10: 1.
6. a preparation method of a high-transparency polyester heat shrinkable film is characterized by comprising the following steps: the method comprises the following steps:
1) putting the PETG polyester chips, the chain extender and the opening agent into high-speed mixing equipment, and stirring and mixing to obtain a layer A mixed material;
2) putting the PETG polyester slices and the PET polyester slices into high-speed mixing equipment, stirring and mixing, putting into a double-screw extruder, and extruding and granulating to obtain a B layer material;
3) putting the A layer of mixed material into an auxiliary extruder screw of three-layer co-extrusion double-drawing equipment for melting and plasticizing, putting the B layer of mixed material into a main extruder screw of the three-layer co-extrusion double-drawing equipment for melting and plasticizing, adjusting the mass ratio of each layer through extruder rotating speed equipment, and preparing the high-transparency polyester heat-shrinkable film with the A/B/A three-layer structure through tape casting and bidirectional stretching in sequence; in the stretching process, the temperature of the final shaping area is controlled within 65-82 ℃ by adopting a mode of continuously or stepwisely reducing the temperature of the shaping area.
7. The method for preparing a high transparent polyester heat shrinkable film of claim 6, wherein: the continuous way of reducing the temperature of the setting area is that: in the shaping process of the PETG heat shrinkable film, the uniform temperature drop of 0.5-3 ℃/1-5m is carried out on a shaping area, and finally the temperature of the shaping area is maintained within the range of 82 ℃ at an inlet and 65 ℃ at an outlet; or, at any stage in the shaping process, the temperature of the shaping area is continuously and uniformly reduced, wherein the temperature of the inlet is 82 ℃ and the temperature of the outlet is 65 ℃.
8. The method for preparing a high transparent polyester heat shrinkable film of claim 6, wherein: the step of reducing the temperature of the setting zone in a batch mode refers to that: in the shaping process of the PETG heat shrinkable film, a shaping area is divided into more than eight sections at equal intervals, the length of each section is ensured to be more than 1 meter, the temperature difference is ensured to be within the range of 1-3 ℃, and finally the temperature of the shaping area is maintained within the range of 82 ℃ at an inlet and 65 ℃ at an outlet.
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| CN202210802776.XA CN115091832A (en) | 2022-07-09 | 2022-07-09 | High-transparency polyester heat shrinkable film and preparation method thereof |
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| CN202210802776.XA CN115091832A (en) | 2022-07-09 | 2022-07-09 | High-transparency polyester heat shrinkable film and preparation method thereof |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116160746A (en) * | 2022-12-27 | 2023-05-26 | 河南银金达新材料股份有限公司 | Antistatic antibacterial heat-shrinkable film and preparation method thereof |
| CN117261397A (en) * | 2023-11-21 | 2023-12-22 | 河南银金达新材料股份有限公司 | Shrinkage force controllable composite heat shrinkage film, production process and shrinkage force control method |
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