CN118024534A - PVDC-PET co-extrusion film and film blowing forming die thereof - Google Patents
PVDC-PET co-extrusion film and film blowing forming die thereof Download PDFInfo
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- CN118024534A CN118024534A CN202410076072.8A CN202410076072A CN118024534A CN 118024534 A CN118024534 A CN 118024534A CN 202410076072 A CN202410076072 A CN 202410076072A CN 118024534 A CN118024534 A CN 118024534A
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- pvdc
- pet
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- die
- bridge
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- 238000001125 extrusion Methods 0.000 title claims abstract description 40
- 238000010096 film blowing Methods 0.000 title claims abstract description 10
- 229920001328 Polyvinylidene chloride Polymers 0.000 claims abstract description 54
- 239000005033 polyvinylidene chloride Substances 0.000 claims abstract description 54
- 229920000139 polyethylene terephthalate Polymers 0.000 claims description 55
- 229920001707 polybutylene terephthalate Polymers 0.000 claims description 4
- 229920005989 resin Polymers 0.000 claims description 4
- 239000011347 resin Substances 0.000 claims description 4
- 229920005644 polyethylene terephthalate glycol copolymer Polymers 0.000 claims description 2
- 229920001225 polyester resin Polymers 0.000 claims 1
- 239000004645 polyester resin Substances 0.000 claims 1
- 238000010411 cooking Methods 0.000 abstract description 8
- 238000000071 blow moulding Methods 0.000 abstract description 4
- 239000002131 composite material Substances 0.000 abstract description 2
- 239000004033 plastic Substances 0.000 abstract description 2
- 229920003023 plastic Polymers 0.000 abstract description 2
- 238000009459 flexible packaging Methods 0.000 abstract 1
- 239000000758 substrate Substances 0.000 abstract 1
- 239000005020 polyethylene terephthalate Substances 0.000 description 45
- 239000004698 Polyethylene Substances 0.000 description 11
- 239000010410 layer Substances 0.000 description 10
- 239000004743 Polypropylene Substances 0.000 description 8
- 239000000463 material Substances 0.000 description 7
- 238000000034 method Methods 0.000 description 5
- 239000005977 Ethylene Substances 0.000 description 4
- 229920006300 shrink film Polymers 0.000 description 4
- 239000004831 Hot glue Substances 0.000 description 3
- 239000000853 adhesive Substances 0.000 description 3
- 229920001577 copolymer Polymers 0.000 description 3
- 230000001070 adhesive effect Effects 0.000 description 2
- 238000009835 boiling Methods 0.000 description 2
- 238000013329 compounding Methods 0.000 description 2
- 238000004132 cross linking Methods 0.000 description 2
- 229920001155 polypropylene Polymers 0.000 description 2
- 230000001954 sterilising effect Effects 0.000 description 2
- 238000004659 sterilization and disinfection Methods 0.000 description 2
- 229920002126 Acrylic acid copolymer Polymers 0.000 description 1
- 229920002799 BoPET Polymers 0.000 description 1
- 239000004677 Nylon Substances 0.000 description 1
- BAPJBEWLBFYGME-UHFFFAOYSA-N acrylic acid methyl ester Natural products COC(=O)C=C BAPJBEWLBFYGME-UHFFFAOYSA-N 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229920006378 biaxially oriented polypropylene Polymers 0.000 description 1
- 239000011127 biaxially oriented polypropylene Substances 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 229920001038 ethylene copolymer Polymers 0.000 description 1
- 235000013305 food Nutrition 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229920001778 nylon Polymers 0.000 description 1
- 229920006284 nylon film Polymers 0.000 description 1
- PNJWIWWMYCMZRO-UHFFFAOYSA-N pent‐4‐en‐2‐one Natural products CC(=O)CC=C PNJWIWWMYCMZRO-UHFFFAOYSA-N 0.000 description 1
- 229920001230 polyarylate Polymers 0.000 description 1
- -1 polybutylene terephthalate Polymers 0.000 description 1
- 229920000728 polyester Polymers 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 239000002356 single layer Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000010345 tape casting Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Landscapes
- Extrusion Moulding Of Plastics Or The Like (AREA)
Abstract
The invention discloses a PVDC-PET co-extrusion film and a film blowing forming die thereof, which belong to the technical field of plastic flexible packaging, wherein the film blowing forming die comprises a transverse bridge-cut-off die and a vertical bridge-cut-off die, a feed inlet 1 and a feed inlet 2 are arranged on the transverse bridge-cut-off die, the vertical bridge-cut-off die comprises a feed inlet 3 and a feed inlet 4, PET and PVDC (the two can be exchanged between inner and outer layers) are respectively added into the feed inlets 1 and 2 and the feed inlets 3 and 4, and the PET and PVDC are subjected to bridge-cut-off treatment in the transverse bridge-cut-off die to be directly co-extruded; the co-extrusion method of the vertical bridge-cut-off die is the same as that of the horizontal bridge-cut-off die. According to the invention, PET and PVDC melt can be separated by using the bridge-cut-off type die, so that the influence of mutual temperature crossing of the PET and PVDC melt is avoided, PVDC and PET can be directly subjected to coextrusion blow molding processing, and the PVDC coextrusion film can be subjected to high-temperature cooking and can be used as a high-temperature cooking resistant high-barrier composite substrate, and the application field of the PVDC coextrusion film is widened.
Description
Technical Field
The invention relates to the technical field of plastic flexible packages, in particular to a PVDC-PET co-extrusion film and a film blowing forming die thereof.
Background
The existing PVDC co-extrusion film is formed by co-extrusion and adhesion of PVDC and PE, PP or PA through hot melt adhesives (such as EVA, EMA, EAA, EEA and the like). There are two processing modes of blow molding and tape casting. The polarity of the PE, PP or PA molecular material is too different from that of the PVDC molecular material, and the PE, PP or PA molecular material cannot be adhered to PVDC in a molten state, and the PE, PP or PA molecular material must be adhered by a hot melt adhesive (such as EVA, EMA, EEA, EAA, and the like, hereinafter collectively referred to as TIE). Typical structure: PE (or PP) -TIE-PVDC-TIE-PE (or PP). Without an adhesive (TIE), they delaminate; so far, no PVDC hot melt adhesive can resist boiling, so that the existing PVDC co-extrusion film cannot be used for medium and high temperature boiling; however, most foods with long shelf life are packaged and then subjected to secondary sterilization (medium-temperature and high-temperature cooking sterilization), and the application field of the common PVDC co-extrusion film is greatly limited due to the fatal defect that the common PVDC co-extrusion film is not resistant to cooking.
The PVDC and PET used as raw materials of the PVDC co-extrusion film produced by the invention can bear high-temperature cooking; typical structures of the PVDC-PET high temperature cooking film are PET-PVDC-PET or PET-PVDC; the present invention is based on the discovery that polyester-based materials (such as PET, PAT, PBT, PCT and the like and their like resins such as PETG and the like, hereinafter PET for example) have similar polarity to PVDC and can be directly thermally fused without an adhesive. After the discovery, the PVDC-PET resin co-extrusion film is developed silently. It is well known that PVDC and PET are processed with water and fire. PVDC processing temperature is not higher than 160 ℃ generally, and decomposition is not carried out; the processing temperature of PET is generally not lower than 250 ℃, otherwise, the PET cannot be formed by hot melting; in the coextrusion processing, the PVDC is decomposed by a common blow molding die, or PET is solidified and is not discharged; around this difficulty, a bridge-cut-off blow molding mold is developed, and the innovation point of the mold structure is that PET and PVDC melt can be separated, so that the influence of the temperature of the PET melt and PVDC melt is avoided, and the technical difficulty of coextrusion of the PET melt and PVDC melt is successfully overcome.
Disclosure of Invention
The invention aims to provide a PVDC-PET co-extrusion film and a film blowing forming die thereof, which are used for producing a high-temperature-resistant PVDC co-extrusion film (PVDC-PET co-extrusion film) or improving the heat resistance of the PVDC-PET co-extrusion film by replacing one side of the PVDC co-extrusion film with PET (typical structure: PET-PVDC-TIE-PE and co-extrusion thereof).
In order to achieve the above purpose, the present invention provides the following technical solutions: the PVDC-PET co-extrusion film and a film blowing forming die thereof, wherein the film blowing forming die comprises a transverse bridge-cut-off die and a vertical bridge-cut-off die, a feed inlet 1 and a feed inlet 2 are arranged on the transverse bridge-cut-off die, and the vertical bridge-cut-off die comprises a feed inlet 3 and a feed inlet 4;
As a further preferred aspect of the present invention: PET and PVDC are respectively added into the feed inlet 1 and the feed inlet 2, and the PET and PVDC are subjected to bridge-cutoff treatment in the transverse bridge-cutoff mold to be subjected to direct co-extrusion; the co-extrusion method of the vertical bridge-cut-off die is the same as that of the horizontal bridge-cut-off die, and the feed inlets of the vertical bridge-cut-off die are a feed inlet 3 and a feed inlet 4;
As a further preferred aspect of the present invention: the PVDC-PET co-extrusion film has the structure comprising PVDC-PET, PET-PVDC-PET and PET-PVDC-TIE-PE (common PVDC co-extrusion die structure can be adopted for co-extrusion of PVDC, TIE, PE and the like).
Compared with the prior art, the invention has the beneficial effects that:
1. According to the invention, the PET and PVDC melt can be separated by using the bridge-cut-off type die, so that the influence of mutual temperature crossing of the PET and PVDC melt is avoided, PVDC and PET can be directly co-extruded and processed, the produced PVDC co-extruded film can bear high-temperature cooking, and the PVDC co-extruded film can be used as a high-temperature cooking resistant high-barrier composite base material, and the application field of the PVDC co-extruded film is widened.
2. The invention can also change one side of the PVDC co-extrusion film into PET instead of dry-method compounding, thereby reducing the processing procedures and the production cost.
3. According to the invention, one side of the PVDC co-extrusion shrink film is replaced by PET, so that the cross-linking procedure is not needed, the expense of purchasing a cross-linking line is saved, and the investment of PVDC co-extrusion shrink film processing equipment is reduced.
Drawings
Fig. 1 is a diagram of a transverse bridge-cut die structure.
Fig. 2 is a view of a vertical bridge cut-off die structure.
In fig. 1: 1. a feed inlet 1; 2. and a feed inlet 2. In fig. 2: 3. a feed inlet 3; 4. and a feed inlet 4.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Examples
Referring to fig. 1 and 2, the present invention provides a technical solution: PVDC-PET coextrudates membrane and its blown film forming die, blown film forming die include horizontal bridge cut-off mould and vertical bridge cut-off mould, be equipped with feed inlet 1 and feed inlet 2 on the horizontal bridge cut-off mould, vertical bridge cut-off mould includes feed inlet 3 and feed inlet 4, because PVDC and PET are both high temperature resistant to cook and disinfect, but the required processing temperature of two is different greatly, consequently both must do bridge cut-off in the coextrusion processing and just can guarantee PVDC not to degrade, PET also does not solidify simultaneously, as long as do PET and PVDC with bridge cut-off processing, the two (1 layer, 2 layers or 3 layers, 4 layers in the figure) are outer layer, and inner layer is done to the layer, can be set according to the product needs. The PVDC layer may be a single layer or be multi-layer co-extruded with other mateable materials as desired.
In this embodiment, specific: PET and PVDC are respectively added into the feed inlet 1 and the feed inlet 2, and the PET and PVDC are subjected to bridge-cutoff treatment in the transverse bridge-cutoff mold to be subjected to direct co-extrusion; the vertical bridge-cut-off type die co-extrusion method is the same as that of the transverse bridge-cut-off type die, and the PVDC-PET co-extrusion film (or PVDC-PET shrink film) can be produced by replacing the forming die of the existing PVDC co-extrusion film blowing equipment (including PVDC co-extrusion shrink film equipment) with the PVDC and PET co-extrusion bridge-cut-off blowing die; the number of the film layers can be designed and manufactured according to the requirements.
In this embodiment, specific: the PVDC-PET co-extrusion film comprises PVDC-PET, PET-PVDC-PET and PET-PVDC-TIE-PE (and co-extrusion thereof). The mold structure only needs to separate PET and PVDC as bridge cut-off;
Remarks:
PVDC-polyvinylidene chloride PE-polyethylene
PP-Polypropylene PA-Nylon
PET-polyethylene terephthalate EVA-ethylene and vinyl acetate copolymer
EMA-ethylene, methyl acrylate copolymer EEA-ethylene, ethyl acrylate copolymer
EAA-ethylene and acrylic acid copolymer OPP-biaxially oriented polypropylene film
CPP-polypropylene casting film OPA-biaxially oriented nylon film
OPET-biaxially oriented PET film TIE-adhesive is generally called
PBT polybutylene terephthalate
PCT-Poly (1, 4-cyclohexanedimethanol) terephthalate
PAT-polyarylates.
While embodiments of the present invention have been shown and described, the core is a PVDC and PET-like coextrusion process. It will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations may be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents. Such as PVDC-PET cast coextrusion and cast compounding processes are also within the scope of the present invention.
Claims (3)
- PVDC-PET co-extrusion film and blown film forming die thereof, characterized in that: the film blowing forming die comprises a transverse bridge-cut-off die and a vertical bridge-cut-off die, wherein a feed inlet 1 (1) and a feed inlet 2 (2) are arranged on the transverse bridge-cut-off die, and the vertical bridge-cut-off die comprises a feed inlet 3 (3) and a feed inlet 4 (4).
- 2. The PVDC-PET co-extruded film and its blown film forming die according to claim 1, wherein: PET and PVDC are respectively added into the feed inlet 1 (1) and the feed inlet 2 (2), and the PET and PVDC are subjected to bridge-cutoff treatment in the transverse bridge-cutoff mold to be subjected to direct co-extrusion; the co-extrusion method of the vertical bridge-cut-off die is the same as that of the horizontal bridge-cut-off die, and the feed inlets of the vertical bridge-cut-off die are a feed inlet 3 (3) and a feed inlet 4 (4).
- 3. The PVDC-PET co-extruded film and its blown film forming die according to claim 1, wherein: the PVDC-PET co-extrusion film has the structure of PVDC-PET, PET-PVDC-PET and PET-PVDC-TIE-PE (and co-extrusion thereof). PET resins include PET, PAT, PBT, PCT and other polyester resins and their like resins such as PETG and the like.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410076072.8A CN118024534A (en) | 2024-01-18 | 2024-01-18 | PVDC-PET co-extrusion film and film blowing forming die thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410076072.8A CN118024534A (en) | 2024-01-18 | 2024-01-18 | PVDC-PET co-extrusion film and film blowing forming die thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN118024534A true CN118024534A (en) | 2024-05-14 |
Family
ID=90994235
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202410076072.8A Pending CN118024534A (en) | 2024-01-18 | 2024-01-18 | PVDC-PET co-extrusion film and film blowing forming die thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN118024534A (en) |
-
2024
- 2024-01-18 CN CN202410076072.8A patent/CN118024534A/en active Pending
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