CN105034511A - Environment-friendly vacuum compressed bags and production process thereof - Google Patents
Environment-friendly vacuum compressed bags and production process thereof Download PDFInfo
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- CN105034511A CN105034511A CN201510449329.0A CN201510449329A CN105034511A CN 105034511 A CN105034511 A CN 105034511A CN 201510449329 A CN201510449329 A CN 201510449329A CN 105034511 A CN105034511 A CN 105034511A
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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
- B32B27/06—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
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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
- B32B27/18—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
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/32—Layered products comprising a layer of synthetic resin comprising polyolefins
- B32B27/325—Layered products comprising a layer of synthetic resin comprising polyolefins comprising polycycloolefins
-
- 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
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
- B32B37/08—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the cooling method
-
- 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
- B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
- B32B37/10—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the pressing technique, e.g. using action of vacuum or fluid pressure
-
- 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
- B32B38/00—Ancillary operations in connection with laminating processes
- B32B38/0004—Cutting, tearing or severing, e.g. bursting; Cutter details
-
- 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
- B32B41/00—Arrangements for controlling or monitoring lamination processes; Safety arrangements
-
- 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
- B32B38/00—Ancillary operations in connection with laminating processes
- B32B38/0012—Mechanical treatment, e.g. roughening, deforming, stretching
- B32B2038/0028—Stretching, elongating
Landscapes
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Bag Frames (AREA)
- Wrappers (AREA)
Abstract
The invention provides a production process of environment-friendly vacuum compressed bags. The production process is characterized in that five or more layers of plastic-uptake deep-forming packaging film materials are adopted, therefore the vacuum compressed bags can achieve a required barrier property, and in addition, a cycloolefin/ethylene copolymer and polyethylene glycol terephthalate are melted for coextru-lamination by adopting five or more layers co-extrusion processing, so that a multi-layer co-extruded film which is excellent in both barrier property and strength is obtained, and then the vacuum compressed bags with the barrier property and strength meeting the use requirements can be obtained by cutting and fusion welding.
Description
Technical field
The present invention relates to plastics packed technical field, particularly relate to the production technology of environment-friendly type vacuum compression bag.
Background technology
The operation principle of vacuum compression bag the air of compressed bag inside is taken away (as pressure sponge will reduce) thus volume is reduced, and utilizes atmospheric pressure that the article such as the original inner matter expanded are flattened, isolation outside air.Compressed bag can easily save 75% space, effectively expands the space of collection, and reach fresh-keeping, dust-proof, mildew-resistant, protection against the tide, insect protected effect.Current typical apply is the vacuum compression collecting bag of cotton-wadded quilt and clothing.
Traditional vacuum compression bag adopts individual layer or few layer co-extrusion plastic packaging film to make, its bad mechanical strength, heat resistance are not enough, gas gas barrier properties are not good, the single macromolecular materials such as main employing polyethylene, polypropylene, PVC, polyester are prepared from by unidirectional or biaxial tension, minority technologically advanced enterprise has started to adopt polyethylene and polypropylene to be raw material, prepares packing articles by three-layer co-extruded technique.
Summary of the invention
In order to solve the problems of the technologies described above, vacuum compression bag of the present invention adopts five layers and the dark shaping packing film material of above multilayer plastic uptake to ensure that it reaches the barrier of needs, adopt five layers and above coextrusion process that cycloolefines/ethylene copolymer ization thing, PETG are carried out melting coextru-lamination, obtain barrier and all splendid PP TYPE of intensity, then through cutting, melting welding obtains the vacuum compression bag that barrier intensity all reaches instructions for use.
A production technology for environment-friendly type vacuum compression bag, concrete steps are as follows: the production first carrying out PP TYPE, then carry out the production of environment-friendly type vacuum compression bag, comprise the steps:
(1) PP TYPE rewinding: before rewinding machine work, the initial tension value of setting wind-up roll and tension decay curve, the input line speed of setting friction roller, PP TYPE is transported on wind-up roll, pivoting friction roller regulates, make the tension force of PP TYPE reach design load, then start rewinding machine and carry out rewinding;
(2) PP TYPE cuts: opened by the PP TYPE after rewinding and be delivered to guillotine through translation conveying roller, cut limiting plate to carry out moving horizontally location according to film thickness, guarantee that cutting blade is vertical according to film thickness, carry out the multi-layer co-extruded diaphragm cutting into suitable size;
(3) sealing chain is installed the side of multi-layer co-extruded diaphragm, vacuum pumping hole is arranged on the front of multi-layer co-extruded diaphragm;
(4) all the other side hot melts of multi-layer co-extruded diaphragm are become bag, obtain environment-friendly type vacuum compression bag;
(5) carry out barrier inspection to environment-friendly type vacuum compression bag, whether test gas barrier property meets the requirements, waste product removing;
(6) intensity sampling observation is carried out to environment-friendly type vacuum compression bag, reject the production batch that intensity is not up to standard;
(7) packaging warehouse-in is carried out to the environment-friendly type vacuum compression bag be up to the standards.
Preferred further, PP TYPE comprises internal layer A from inside to outside, dielectric layer B, intermediate layer C, dielectric layer D, outer E, and its production comprises the steps:
(1) purchasing of raw materials: purchase appropriate raw material according to output, raw material comprises cycloolefines/ethylene copolymer ization thing, PETG, the amorphism transparent resin that cycloolefines/ethylene copolymer ization thing selects metallocene catalyst ethene and ENB combined polymerization to be obtained;
(2) prepare burden: it is raw material that internal layer A adopts mass ratio to be the cycloolefines/ethylene copolymer ization thing of 1:5 and PETG blend; Outer E adopts mass ratio to be that the cycloolefines/ethylene copolymer ization thing of 1:10 and PETG blend are as raw material; Intermediate layer C is made up of alpha-olefine polymers substantially, and what this kind of alpha-olefine polymers comprised 60-90% weight portion is selected from polypropylene, polyethylene, the polymer of LLDPE of metallocene catalyst and the butylene copolymer of 10-40% weight portion or terpolymer; Polymer for dielectric layer B and dielectric layer D to be fusing point the be alpha-olefine polymers of 90-150 DEG C, its stretch modulus is higher than 15MPa;
(3) multilayered molten co-extrusion: each layer raw material is delivered to heating and melting in the coextrusion film blowing unit of the corresponding number of plies and become polymer melt, then by each laminar flow in the stacked conjunction in co-extrusion die head middle level, be combined into co-extrusion film;
(4) flow casting molding: film is extruded by casting head, plastics sucking moulding, uses stenter to stretch simultaneously in machine and transverse direction;
(5) cooling forming: adopt chill roll cooling curing, uses the cooling of water circulation radial direction in chill roll.
Preferred further, PP TYPE is divided into seven layers from inside to outside, is respectively hot sealing layer A1, internal layer A, dielectric layer B, intermediate layer C, dielectric layer D, outer E, weathering layer E1.
Preferred further, hot sealing layer A1 adopts the metallocene polypropylene of 30-60% weight portion and the polypropylene copolymer of polyisobutene modification and PETG blend to be raw material; Weathering layer E1 adopts copolymer nylon copolymer, is specially the amorphous nylons of 15%-25 weight portion and the anti-stick copolymer nylon copolymer connecting master batch modification of 1-1.5%.
Accompanying drawing explanation
Fig. 1 is process flow diagram of the present invention.
Detailed description of the invention
Below in conjunction with specific embodiment, the present invention is further described, but does not limit the invention to these detailed description of the invention.One skilled in the art would recognize that all alternatives, improvement project and the equivalents that present invention encompasses and may comprise in Claims scope.
Embodiment 1
A production technology for environment-friendly type vacuum compression bag, concrete steps are as follows:
First carry out the production of PP TYPE, described PP TYPE is the dark shaping packing film material of plastic uptake, and be divided into five layers from inside to outside, be respectively internal layer A, dielectric layer B, intermediate layer C, dielectric layer D, outer E, comprises the steps:
(1) purchasing of raw materials: purchase appropriate cycloolefines/ethylene copolymer ization thing, PETG according to output, the amorphism transparent resin that cycloolefines/ethylene copolymer ization thing selects metallocene catalyst ethene and ENB combined polymerization to be obtained;
(2) prepare burden: it is raw material that internal layer A adopts mass ratio to be the cycloolefines/ethylene copolymer ization thing of 1:5 and PETG blend; Outer E adopts mass ratio to be that the cycloolefines/ethylene copolymer ization thing of 1:10 and PETG blend are as raw material; Intermediate layer C is made up of alpha-olefine polymers substantially, and what this kind of alpha-olefine polymers comprised 60-90% weight portion is selected from polypropylene, polyethylene, the polymer of LLDPE of metallocene catalyst and the butylene copolymer of 10-40% weight portion or terpolymer; Dielectric layer B and dielectric layer D contributes to ensureing the bonding between each layer, increases film strength, the polymer being preferred for dielectric layer B and dielectric layer D to be fusing point the be alpha-olefine polymers of 90-150 DEG C, and its stretch modulus is higher than 15MPa;
(3) multilayered molten co-extrusion: each layer raw material is delivered to heating and melting in five-layer co-squeezing blown film unit and become polymer melt, then by each laminar flow in the stacked conjunction in co-extrusion die head middle level, be combined into co-extrusion film;
(4) flow casting molding: film is extruded by casting head, plastics sucking moulding, uses stenter to stretch simultaneously in machine and transverse direction;
(5) cooling forming: adopt chill roll cooling curing, uses the cooling of water circulation radial direction in chill roll;
Then carry out the production of environment-friendly type vacuum compression bag, comprise the steps:
(1) PP TYPE rewinding: before rewinding machine work, the initial tension value of setting wind-up roll and tension decay curve, the input line speed of setting friction roller, PP TYPE is transported on wind-up roll, pivoting friction roller regulates, make the tension force of PP TYPE reach design load, then start rewinding machine and carry out rewinding;
(2) PP TYPE cuts: opened by the PP TYPE after rewinding and be delivered to guillotine through translation conveying roller, cut limiting plate to carry out moving horizontally location according to film thickness, guarantee that cutting blade is vertical according to film thickness, carry out the multi-layer co-extruded diaphragm cutting into suitable size;
(3) sealing chain is installed the side of multi-layer co-extruded diaphragm, vacuum pumping hole is arranged on the front of multi-layer co-extruded diaphragm;
(4) all the other side hot melts of multi-layer co-extruded diaphragm are become bag, obtain environment-friendly type vacuum compression bag;
(5) carry out barrier inspection to environment-friendly type vacuum compression bag, whether test gas barrier property meets the requirements, waste product removing;
(6) intensity sampling observation is carried out to environment-friendly type vacuum compression bag, reject the production batch that intensity is not up to standard;
(7) packaging warehouse-in is carried out to the environment-friendly type vacuum compression bag be up to the standards.
Embodiment 2
Different from embodiment 1, the PP TYPE of use is the PP TYPE of seven layers, is divided into seven layers from inside to outside, is respectively hot sealing layer A1, internal layer A, dielectric layer B, intermediate layer C, dielectric layer D, outer E, and weathering layer E1, comprises the steps:
(1) purchasing of raw materials: purchase appropriate cycloolefines/ethylene copolymer ization thing, PETG according to output, the amorphism transparent resin that cycloolefines/ethylene copolymer ization thing selects metallocene catalyst ethene and ENB combined polymerization to be obtained;
(2) prepare burden: it is raw material that internal layer A adopts mass ratio to be the cycloolefines/ethylene copolymer ization thing of 1:5 and PETG blend; Outer E adopts mass ratio to be that the cycloolefines/ethylene copolymer ization thing of 1:10 and PETG blend are as raw material; Intermediate layer C is made up of alpha-olefine polymers substantially, and what this kind of alpha-olefine polymers comprised 60-90% weight portion is selected from polypropylene, polyethylene, the polymer of LLDPE of metallocene catalyst and the butylene copolymer of 10-40% weight portion or terpolymer; Dielectric layer B and dielectric layer D contributes to ensureing the bonding between each layer, increases film strength, the polymer being preferred for dielectric layer B and dielectric layer D to be fusing point the be alpha-olefine polymers of 90-150 DEG C, and its stretch modulus is higher than 15MPa; Hot sealing layer A1 adopts the metallocene polypropylene of 30-60% weight portion and the polypropylene copolymer of polyisobutene modification and PETG blend to be raw material; Weathering layer E1 adopts copolymer nylon copolymer, is specially the amorphous nylons of 15%-25 weight portion and the anti-stick copolymer nylon copolymer connecting master batch modification of 1-1.5%.
All the other steps are identical with embodiment 1.
The environment-friendly type vacuum compression bag produced according to present invention process is tested, and the Main Economic technical indicator obtained is as follows:
1) the resistance to light characteristics of product: by PV1303 fast light sighting target standard regulation requirement 5 cycle color fastness 4 grades;
2) heat-resisting, the cold tolerance of product: product respectively deposits 48 hours in 110 ± ± 2 DEG C ,-40 ± 2 DEG C, product is without there is shape, visible and (or) affect the change of function in color and surface quality;
3) product gas gas barrier properties: the gas barrier property of packaging film meets Q/NHF01-2011 " medicine equipment plastic packaging film " test request.
4) product strength characteristic energy: hot strength is not less than 40MPa.
Claims (5)
1. a production technology for environment-friendly type vacuum compression bag, concrete steps are as follows: the production first carrying out PP TYPE, then carry out the production of environment-friendly type vacuum compression bag, comprise the steps:
(1) PP TYPE rewinding: before rewinding machine work, the initial tension value of setting wind-up roll and tension decay curve, the input line speed of setting friction roller, PP TYPE is transported on wind-up roll, pivoting friction roller regulates, make the tension force of PP TYPE reach design load, then start rewinding machine and carry out rewinding;
(2) PP TYPE cuts: opened by the PP TYPE after rewinding and be delivered to guillotine through translation conveying roller, cut limiting plate to carry out moving horizontally location according to film thickness, guarantee that cutting blade is vertical according to film thickness, carry out the multi-layer co-extruded diaphragm cutting into suitable size;
(3) sealing chain is installed the side of multi-layer co-extruded diaphragm, vacuum pumping hole is arranged on the front of multi-layer co-extruded diaphragm;
(4) all the other side hot melts of multi-layer co-extruded diaphragm are become bag, obtain environment-friendly type vacuum compression bag;
(5) carry out barrier inspection to environment-friendly type vacuum compression bag, whether test gas barrier property meets the requirements, waste product removing;
(6) intensity sampling observation is carried out to environment-friendly type vacuum compression bag, reject the production batch that intensity is not up to standard;
(7) packaging warehouse-in is carried out to the environment-friendly type vacuum compression bag be up to the standards.
2. the production technology of a kind of environment-friendly type vacuum compression bag as claimed in claim 1, is characterized in that: described PP TYPE comprises internal layer A from inside to outside, dielectric layer B, intermediate layer C, dielectric layer D, outer E, and its production comprises the steps:
(1) purchasing of raw materials: purchase appropriate raw material according to output, raw material comprises cycloolefines/ethylene copolymer ization thing, PETG, the amorphism transparent resin that cycloolefines/ethylene copolymer ization thing selects metallocene catalyst ethene and ENB combined polymerization to be obtained;
(2) prepare burden: it is raw material that internal layer A adopts mass ratio to be the cycloolefines/ethylene copolymer ization thing of 1:5 and PETG blend; Outer E adopts mass ratio to be that the cycloolefines/ethylene copolymer ization thing of 1:10 and PETG blend are as raw material; Intermediate layer C is made up of alpha-olefine polymers substantially, and what this kind of alpha-olefine polymers comprised 60-90% weight portion is selected from polypropylene, polyethylene, the polymer of LLDPE of metallocene catalyst and the butylene copolymer of 10-40% weight portion or terpolymer; Polymer for dielectric layer B and dielectric layer D to be fusing point the be alpha-olefine polymers of 90-150 DEG C, its stretch modulus is higher than 15MPa;
(3) multilayered molten co-extrusion: each layer raw material is delivered to heating and melting in the coextrusion film blowing unit of the corresponding number of plies and become polymer melt, then by each laminar flow in the stacked conjunction in co-extrusion die head middle level, be combined into co-extrusion film;
(4) flow casting molding: film is extruded by casting head, plastics sucking moulding, uses stenter to stretch simultaneously in machine and transverse direction;
(5) cooling forming: adopt chill roll cooling curing, uses the cooling of water circulation radial direction in chill roll.
3. the production technology of a kind of environment-friendly type vacuum compression bag as claimed in claim 2, is characterized in that: described PP TYPE is divided into seven layers from inside to outside, is respectively hot sealing layer A1, internal layer A, dielectric layer B, intermediate layer C, dielectric layer D, outer E, weathering layer E1.
4. the production technology of a kind of environment-friendly type vacuum compression bag as claimed in claim 3, is characterized in that: hot sealing layer A1 adopts the metallocene polypropylene of 30-60% weight portion and the polypropylene copolymer of polyisobutene modification and PETG blend to be raw material; Weathering layer E1 adopts copolymer nylon copolymer, is specially the amorphous nylons of 15%-25 weight portion and the anti-stick copolymer nylon copolymer connecting master batch modification of 1-1.5%.
5. as Claims 1 to 4 arbitrary as described in the obtained environment-friendly type vacuum compression bag of production technology.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510449329.0A CN105034511B (en) | 2015-07-27 | 2015-07-27 | Environment-friendly vacuum compressed bags and production process thereof |
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| CN201510449329.0A CN105034511B (en) | 2015-07-27 | 2015-07-27 | Environment-friendly vacuum compressed bags and production process thereof |
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| CN105034511B CN105034511B (en) | 2017-03-22 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109291452A (en) * | 2018-08-09 | 2019-02-01 | 桐乡市凯瑞包装材料有限公司 | The production method of the degradable accommodating objects storage bag of multipurpose |
| CN109294028A (en) * | 2018-08-09 | 2019-02-01 | 桐乡市凯瑞包装材料有限公司 | The manufacture craft of biodegradable courier bag |
| CN110254933A (en) * | 2019-05-28 | 2019-09-20 | 余姚市华寅包装材料有限公司 | A kind of vacuum compression bag and its production technology with antibacterial functions |
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| US20040101659A1 (en) * | 2002-11-22 | 2004-05-27 | Charles Kannankeril | High strength high gas barrier cellular cushioning product |
| CN202846980U (en) * | 2012-10-12 | 2013-04-03 | 海宁市汇龙塑料有限公司 | Composite film roll capable of exhausting air easily |
| CN202965210U (en) * | 2012-12-29 | 2013-06-05 | 常州市达力塑料机械有限公司 | Film casting machine |
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2015
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| US20040101659A1 (en) * | 2002-11-22 | 2004-05-27 | Charles Kannankeril | High strength high gas barrier cellular cushioning product |
| CN202846980U (en) * | 2012-10-12 | 2013-04-03 | 海宁市汇龙塑料有限公司 | Composite film roll capable of exhausting air easily |
| CN202965210U (en) * | 2012-12-29 | 2013-06-05 | 常州市达力塑料机械有限公司 | Film casting machine |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109291452A (en) * | 2018-08-09 | 2019-02-01 | 桐乡市凯瑞包装材料有限公司 | The production method of the degradable accommodating objects storage bag of multipurpose |
| CN109294028A (en) * | 2018-08-09 | 2019-02-01 | 桐乡市凯瑞包装材料有限公司 | The manufacture craft of biodegradable courier bag |
| CN109291452B (en) * | 2018-08-09 | 2021-02-09 | 桐乡市凯瑞包装材料有限公司 | Method for manufacturing multipurpose easily-degradable storage bag |
| CN112895371A (en) * | 2018-08-09 | 2021-06-04 | 桐乡市凯瑞包装材料有限公司 | Manufacturing method of multipurpose easily-degradable improved storage bag |
| CN110254933A (en) * | 2019-05-28 | 2019-09-20 | 余姚市华寅包装材料有限公司 | A kind of vacuum compression bag and its production technology with antibacterial functions |
| CN110254933B (en) * | 2019-05-28 | 2020-08-11 | 余姚市华寅包装材料有限公司 | Vacuum compression bag with antibacterial function and production process thereof |
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| CN105034511B (en) | 2017-03-22 |
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Application publication date: 20151111 Assignee: NINGBO WEIFENG NEW MATERIAL Co.,Ltd. Assignor: NINGBO HUAFENG PACKAGE CO.,LTD. Contract record no.: X2021330000736 Denomination of invention: An environment-friendly vacuum compression bag and its production process Granted publication date: 20170322 License type: Common License Record date: 20211109 |
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Application publication date: 20151111 Assignee: Ningbo Weifeng Environmental Protection Group Co.,Ltd. Assignor: NINGBO HUAFENG PACKAGE CO.,LTD. Contract record no.: X2023330000442 Denomination of invention: An environmentally friendly vacuum compression bag and its production process Granted publication date: 20170322 License type: Common License Record date: 20230724 |