CN114905780A - Stretched base material film with small anisotropy and double-bubble production method and application thereof - Google Patents
Stretched base material film with small anisotropy and double-bubble production method and application thereof Download PDFInfo
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- CN114905780A CN114905780A CN202210673042.6A CN202210673042A CN114905780A CN 114905780 A CN114905780 A CN 114905780A CN 202210673042 A CN202210673042 A CN 202210673042A CN 114905780 A CN114905780 A CN 114905780A
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- 239000000463 material Substances 0.000 title claims abstract description 14
- 238000004519 manufacturing process Methods 0.000 title claims description 6
- 238000000034 method Methods 0.000 claims abstract description 20
- 238000009998 heat setting Methods 0.000 claims abstract description 12
- 238000001816 cooling Methods 0.000 claims abstract description 9
- 238000010438 heat treatment Methods 0.000 claims abstract description 9
- 239000004952 Polyamide Substances 0.000 claims abstract description 6
- 229920002647 polyamide Polymers 0.000 claims abstract description 6
- 229920000728 polyester Polymers 0.000 claims abstract description 6
- 238000005520 cutting process Methods 0.000 claims abstract description 5
- 238000005096 rolling process Methods 0.000 claims abstract description 4
- 239000000758 substrate Substances 0.000 claims abstract 3
- 239000011347 resin Substances 0.000 claims description 13
- 229920005989 resin Polymers 0.000 claims description 13
- 239000002994 raw material Substances 0.000 claims description 11
- 239000002131 composite material Substances 0.000 claims description 9
- 238000002844 melting Methods 0.000 claims description 5
- 230000008018 melting Effects 0.000 claims description 5
- 238000004804 winding Methods 0.000 claims description 4
- 239000000853 adhesive Substances 0.000 claims description 3
- 230000001070 adhesive effect Effects 0.000 claims description 3
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical group [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 3
- 229910052782 aluminium Inorganic materials 0.000 claims description 3
- 239000011888 foil Substances 0.000 claims description 3
- -1 polybutylene terephthalate Polymers 0.000 claims description 3
- 239000004743 Polypropylene Substances 0.000 claims description 2
- 229920001155 polypropylene Polymers 0.000 claims description 2
- 239000002245 particle Substances 0.000 claims 2
- 229920002292 Nylon 6 Polymers 0.000 claims 1
- 229920002302 Nylon 6,6 Polymers 0.000 claims 1
- 229920001707 polybutylene terephthalate Polymers 0.000 claims 1
- 229920000915 polyvinyl chloride Polymers 0.000 claims 1
- 239000004800 polyvinyl chloride Substances 0.000 claims 1
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 abstract description 4
- 230000002457 bidirectional effect Effects 0.000 abstract description 4
- 229910052744 lithium Inorganic materials 0.000 abstract description 4
- 238000004080 punching Methods 0.000 abstract description 4
- 238000001125 extrusion Methods 0.000 abstract description 2
- 229920006284 nylon film Polymers 0.000 description 7
- 230000000052 comparative effect Effects 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 238000012986 modification Methods 0.000 description 4
- 230000004048 modification Effects 0.000 description 4
- 239000004677 Nylon Substances 0.000 description 3
- 229920006267 polyester film Polymers 0.000 description 3
- 239000003814 drug Substances 0.000 description 2
- 238000007688 edging Methods 0.000 description 2
- 238000009459 flexible packaging Methods 0.000 description 2
- 230000009477 glass transition Effects 0.000 description 2
- 230000007774 longterm Effects 0.000 description 2
- 229920001778 nylon Polymers 0.000 description 2
- 239000004033 plastic Substances 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 239000004809 Teflon Substances 0.000 description 1
- 229920006362 Teflon® Polymers 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008602 contraction Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 239000012785 packaging film Substances 0.000 description 1
- 229920006280 packaging film Polymers 0.000 description 1
- 238000004806 packaging method and process Methods 0.000 description 1
- 238000002161 passivation Methods 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 238000004513 sizing Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
- B29D7/00—Producing flat articles, e.g. films or sheets
- B29D7/01—Films or sheets
-
- 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
- B32B15/00—Layered products comprising a layer of metal
- B32B15/04—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material
- B32B15/08—Layered products comprising a layer of metal comprising metal 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
- B32B15/00—Layered products comprising a layer of metal
- B32B15/04—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material
- B32B15/08—Layered products comprising a layer of metal comprising metal 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
- B32B15/085—Layered products comprising a layer of metal comprising metal 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 comprising polyolefins
-
- 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
-
- 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
- B32B27/30—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers
- B32B27/308—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers comprising acrylic (co)polymers
-
- 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
- B32B27/32—Layered products comprising a layer of synthetic resin comprising polyolefins
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Shaping By String And By Release Of Stress In Plastics And The Like (AREA)
Abstract
The invention discloses a method for preparing a stretched substrate film with small anisotropy, which comprises the following steps: a) the multilayer co-extrusion tubular film blank has a structure of three layers of polyamide or three layers of polyester; b) after coextrusion at the temperature of 200 ℃ and 250 ℃, air cooling is carried out to the room temperature; c) and (3) bidirectional stretching: preheating the cooled film blank to 65-150 ℃, and performing bidirectional stretching, wherein the longitudinal stretching and the transverse stretching are both 2.5-3.5 times; d) heat setting treatment: flattening the stretched film bubble to open the edge, and carrying out heat setting treatment under the condition of keeping longitudinal and transverse tension; e) cooling and rolling: and cooling the film after the heat treatment, cutting edges, and rolling to obtain a finished product. The stretching base material film disclosed by the invention has excellent punching depth performance, and is suitable for lithium battery soft packages and medical blister packages which require deep punching forming.
Description
Technical Field
The invention belongs to the technical field of plastic flexible packaging films, and relates to a stretched base material film with small anisotropy as well as a double-bubble production method and application thereof.
Background
Nylon is widely used in the field of plastic flexible packaging due to its characteristics of high toughness, barrier property, etc. Especially in some medical blister packages and lithium battery soft packages which need deep drawing and forming, the nylon film becomes an indispensable raw material. However, most of the nylon films on the market today are produced by the flat film double-draw method, and the sequential stretching method and the simultaneous stretching method have large anisotropy, i.e., large difference between the extensibility and the contractibility in each direction, so that the composite film is easily delaminated or cracked during deep drawing, or the composite film is delaminated and content leakage occurs due to nonuniform contraction during heat sealing bag making, long-term storage and use. Therefore, in the long-term production of composite films, the manufacturers of composite films must continuously search and use imported special adhesives or imported special nylon films to improve the above problems, but cannot perfectly solve the problems.
Disclosure of Invention
The invention aims to provide a stretched base material film with small anisotropy and a preparation method thereof, aiming at solving the problem that the existing biaxially oriented nylon film is easy to delaminate and crack during the forming of a composite film.
The method for producing a stretched base material film having a small anisotropy of the present invention comprises the steps of:
a) first bubble-three layer coextruded tubular film blank: respectively melting and plasticizing resin raw materials in three extruders, converging the resin raw materials in a die head, and extruding a tubular film blank with a three-layer structure from an annular die, wherein the thickness of the tubular film blank is 120-300 mu m; the three layers of the film blank are made of polyamide or polyester;
b) rapidly cooling the extruded tubular film blank by using cold air;
c) second bubble-biaxial stretching: heating the cooled tubular film blank to a temperature between the glass transition temperature and the melting temperature, preferably within a range of 65-150 ℃; then carrying out bidirectional stretching through longitudinal mechanical traction and air inflation to enable resin molecules to be oriented; the stretching ratio is controlled as follows: longitudinal direction is 2.5-3.5, and transverse direction is 2.5-3.5;
d) heat setting treatment: flattening and edging the biaxially-oriented film bubble by a clamping roller, separating an upper film and a lower film, fixing two sides of the film by a clamp, and performing heat setting treatment in a channel at 180-250 ℃ under the condition of keeping longitudinal and transverse tension so as to eliminate the internal stress of the film and stabilize the size and performance of the film;
e) winding: and cooling the shaped film, cutting edges, and winding up and down respectively to obtain a finished product.
The method is based on two-way stretching of the film bubble and one-time heat setting to prepare the stretching base material film with small anisotropy, wherein the first film bubble is co-extruded by an extruder to form a tubular film blank without stretching; the second bubble stretching is completed after heating in step c. Through the second biaxial stretching and heat setting treatment of the film bubble, the anisotropy of the formed film can be effectively reduced, namely better uniformity is achieved.
According to the invention, the resin raw material polyamide or polyester is co-extruded by three extruders, so that the arrangement of resin molecular chains is not single, and the stretched molecular chains are more beneficial to non-pure longitudinal and transverse orientation, thereby achieving a more balanced effect in each direction. Thereby leading the film to obtain more uniform extensibility and contractibility and showing more excellent deep drawing forming adaptability.
The positive progress effects of the invention are as follows:
1. according to the invention, the resin raw material polyamide or polyester is extruded into a tubular film blank by three extruders and then is stretched bidirectionally, the orientation of resin molecular chains is relatively closer in each direction, and the strength, extensibility and contractibility are relatively balanced in each direction, so that the film is endowed with excellent deep drawing performance.
2. According to the invention, the method of heat setting treatment after splitting the film bubble is adopted, so that two surfaces of the single film are heated more uniformly, internal stress is eliminated more effectively, setting is completed, and the stable performance of the stretched film is ensured.
In conclusion, the stretched base material film with small anisotropy of the invention has excellent drawing depth performance, and is more suitable for packaging applications with drawing depth requirements such as food, medicine, lithium batteries and the like compared with nylon films or polyester films obtained by the traditional flat film stretching method.
Drawings
FIG. 1 is a schematic process flow diagram of the present invention.
Detailed Description
The following specific examples are given for further illustration of the present invention, but the present invention is not limited to the specific examples, and any modifications of the present invention can be made to achieve similar effects, and these modifications are included in the present invention.
Examples 1 and 2: a three-layer structure nylon membrane; example 3: polyester film having three-layer structure
Nylon and polyester films having a three-layer structure were prepared by co-extrusion and biaxial stretching according to the process flow (double bubble method) shown in fig. 1.
First, film formula
The raw materials and basic parameters of examples 1 to 3 are shown in Table 1.
TABLE 1 raw materials and basic parameters for examples 1-3
Secondly, the preparation step
a) First bubble-three layer coextruded tubular film blank: respectively melting and plasticizing resin raw materials by three extruders, converging the melted and plasticized resin raw materials in a die head, and extruding a film blank with a three-layer structure through an annular die, wherein the thickness of the film blank is 120-300 mu m; the three layers of the film blank are made of polyamide or polyester;
b) rapidly cooling the extruded tubular film blank by using cold air;
c) second bubble-biaxial stretching: heating the cooled tubular film blank to a temperature between the glass transition temperature and the melting temperature, and selecting a temperature range of 65-150 ℃; then carrying out bidirectional stretching through longitudinal mechanical traction and air inflation to enable resin molecules to be oriented; the stretching ratio is controlled as follows: longitudinal direction is 2.5-3.5, and transverse direction is 2.5-3.5;
d) heat setting treatment: flattening and edging the biaxially-oriented film bubble by a clamping roller, separating an upper film and a lower film, fixing two sides of the film by a clamp, and setting in a channel at 180-250 ℃ under the condition of keeping longitudinal and transverse tension;
e) winding: and cooling the film after the sizing treatment, and respectively rolling up and down after edge cutting to obtain a finished product.
The process parameters of examples 1-3 are specifically shown in Table 2.
TABLE 2 Process parameters for examples 1-3
| Example 1 | Example 2 | Example 3 | |
| Film blank thickness/mum | 144 | 240 | 144 |
| Longitudinal draw ratio | 3.0 | 3.0 | 3.0 |
| Transverse draw ratio | 3.2 | 3.2 | 3.2 |
| Stretching temperature/. degree.C | 90 | 125 | 80 |
| Heat setting temperature/. degree.C | 200 | 210 | 200 |
The films prepared in examples 1 to 3 were subjected to performance tests with the flat film biaxially oriented nylon films of comparative examples 1 and 2 purchased from the market, and the results are shown in table 3.
TABLE 3 film property data for examples 1-3 and comparative examples 1, 2
Note 1: and (3) respectively using the examples 1-3 and the comparative examples 1-2 as outer layer materials to be bonded with the middle layer aluminum foil and the inner layer polypropylene film by using an adhesive, wherein the aluminum foil is subjected to passivation treatment before bonding. Cutting the obtained composite film into a sample of 130mm multiplied by 240mm, stamping by using a specific die (the material of the upper die and the lower die is S136 mirror die steel, and the material of the die core is Teflon), under the pressure of 0.15MPa-0.3MPa, checking the appearance of the sample, and measuring the stamping depth by using a measuring tool with the precision not lower than 0.1 mm. The larger the punching depth of the composite film is, the better the punching depth performance is.
Note 2: a is more than 7 mm in maximum stamping depth, B is 6-7 mm in maximum stamping depth, and C is 5-6 mm in maximum stamping depth
As is clear from table 3, the tensile strength of the stretched base films having small anisotropy produced by the method of the present invention, particularly, the tensile strength of examples 1 and 2 is equal to or higher than that of comparative examples 1 and 2, and the impact strength is remarkably excellent and the shrinkage in the longitudinal and transverse directions is more balanced. In addition, the examples 1 to 3 show significantly excellent performance in deep drawing formability. The stretching base material film is more suitable for flexible package composite films of food, medicine and lithium batteries with drawing depth requirements.
While the preferred embodiments of the present invention have been described, the present invention is not limited to the embodiments, and similar effects can be achieved by slight modifications based on the gist of the present invention, and the modifications are included in the scope defined by the claims of the present application.
Claims (7)
1. A method for producing a stretched substrate film having a small anisotropy by a double bubble method, comprising the steps of:
a) first bubble-three layer coextruded tubular film blank: respectively melting resin raw material particles through three extruders, converging the melted resin raw material particles in a die head, and extruding a tubular film blank with a three-layer structure through an annular die, wherein the thickness of the tubular film blank is 120-300 mu m; the three layers of the film blank are made of polyamide or polyester;
b) performing air cooling after the tubular film blank is co-extruded;
c) second bubble-biaxial stretching: heating the cooled tubular film blank to 65-150 ℃, and then performing biaxial stretching through mechanical traction and air inflation to orient resin molecules; the stretching ratio is controlled as follows: longitudinal direction is 2.5-3.5, and transverse direction is 2.5-3.5;
d) heat setting treatment: after the biaxially oriented film bubble is flattened, the film bubble is drawn to a channel at the temperature of 180-250 ℃ for heat setting treatment under the condition of keeping longitudinal and transverse tension after being separated up and down;
e) winding: and cooling the film after the heat treatment, and performing edge cutting and rolling to obtain a finished product.
2. The method of claim 1, wherein in step a, each layer of material is independently selected from the group consisting of nylon 6, nylon 66, and polybutylene terephthalate.
3. The method as claimed in claim 1, wherein the thickness of the tubular film blank prepared in step a is 120-300 μm; and e, the thickness of the finished film obtained in the step e is 15-30 mu m.
4. The method of claim 1, wherein the heating in step c is infrared heating or hot air heating.
5. The method of claim 1 wherein in step d, the bubble is split into upper and lower pieces before the heat setting process, and the pieces are drawn into the setting tunnel by a clamp.
6. A stretched substrate film having a low anisotropy, produced by the process according to any one of claims 1 to 5.
7. A multilayer composite film comprises an outer layer, a middle layer and an inner layer, wherein the layers are respectively bonded through an adhesive; characterized in that the outer layer is the stretched base material film with low anisotropy as claimed in claim 6, the middle layer is an aluminum foil, and the inner layer is a polypropylene film or a polyvinyl chloride film.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210673042.6A CN114905780A (en) | 2022-06-14 | 2022-06-14 | Stretched base material film with small anisotropy and double-bubble production method and application thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210673042.6A CN114905780A (en) | 2022-06-14 | 2022-06-14 | Stretched base material film with small anisotropy and double-bubble production method and application thereof |
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| CN114905780A true CN114905780A (en) | 2022-08-16 |
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| CN202210673042.6A Pending CN114905780A (en) | 2022-06-14 | 2022-06-14 | Stretched base material film with small anisotropy and double-bubble production method and application thereof |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2547502Y (en) * | 2002-06-03 | 2003-04-30 | 汕头市江鸿塑胶设备有限公司 | Apparatus for producing biaxially oriented plastic film |
| CN201525121U (en) * | 2009-05-29 | 2010-07-14 | 河北方盛塑业有限公司 | Blow molding equipment for producing polyvinyl alcohol film |
| JP2010280123A (en) * | 2009-06-04 | 2010-12-16 | Teijin Dupont Films Japan Ltd | Method for manufacturing biaxially stretched film |
| CN109367044A (en) * | 2018-09-26 | 2019-02-22 | 江阴长庚高科技材料有限公司 | A kind of high-impact biaxial stretching polyester/polyamide film and preparation method thereof |
| CN109367045A (en) * | 2018-09-26 | 2019-02-22 | 江阴长庚高科技材料有限公司 | A kind of high-impact two-way stretching polyamide film and secondly bubble production method and application |
-
2022
- 2022-06-14 CN CN202210673042.6A patent/CN114905780A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2547502Y (en) * | 2002-06-03 | 2003-04-30 | 汕头市江鸿塑胶设备有限公司 | Apparatus for producing biaxially oriented plastic film |
| CN201525121U (en) * | 2009-05-29 | 2010-07-14 | 河北方盛塑业有限公司 | Blow molding equipment for producing polyvinyl alcohol film |
| JP2010280123A (en) * | 2009-06-04 | 2010-12-16 | Teijin Dupont Films Japan Ltd | Method for manufacturing biaxially stretched film |
| CN109367044A (en) * | 2018-09-26 | 2019-02-22 | 江阴长庚高科技材料有限公司 | A kind of high-impact biaxial stretching polyester/polyamide film and preparation method thereof |
| CN109367045A (en) * | 2018-09-26 | 2019-02-22 | 江阴长庚高科技材料有限公司 | A kind of high-impact two-way stretching polyamide film and secondly bubble production method and application |
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Application publication date: 20220816 |