CN118024526A - Preparation method of sterilizing outer cover film of medicine bag - Google Patents
Preparation method of sterilizing outer cover film of medicine bag Download PDFInfo
- Publication number
- CN118024526A CN118024526A CN202410447271.5A CN202410447271A CN118024526A CN 118024526 A CN118024526 A CN 118024526A CN 202410447271 A CN202410447271 A CN 202410447271A CN 118024526 A CN118024526 A CN 118024526A
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- outer cover
- melt
- medicine bag
- sterilizing
- cover film
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- 230000001954 sterilising effect Effects 0.000 title claims abstract description 29
- 239000003814 drug Substances 0.000 title claims abstract description 28
- 239000013039 cover film Substances 0.000 title claims abstract description 23
- 238000002360 preparation method Methods 0.000 title claims abstract description 10
- 238000000034 method Methods 0.000 claims abstract description 19
- 238000001125 extrusion Methods 0.000 claims abstract description 17
- 239000002994 raw material Substances 0.000 claims abstract description 15
- 239000004677 Nylon Substances 0.000 claims abstract description 10
- 239000004743 Polypropylene Substances 0.000 claims abstract description 10
- 229920001778 nylon Polymers 0.000 claims abstract description 10
- -1 polypropylene Polymers 0.000 claims abstract description 9
- 229920001155 polypropylene Polymers 0.000 claims abstract description 9
- 239000000155 melt Substances 0.000 claims description 24
- 239000000463 material Substances 0.000 claims description 21
- 238000009826 distribution Methods 0.000 claims description 16
- 239000010408 film Substances 0.000 claims description 15
- 239000004033 plastic Substances 0.000 claims description 14
- 229920003023 plastic Polymers 0.000 claims description 14
- 238000010438 heat treatment Methods 0.000 claims description 13
- 238000001816 cooling Methods 0.000 claims description 10
- 230000006835 compression Effects 0.000 claims description 8
- 238000007906 compression Methods 0.000 claims description 8
- 238000004806 packaging method and process Methods 0.000 claims description 8
- 238000004804 winding Methods 0.000 claims description 8
- 238000005192 partition Methods 0.000 claims description 7
- 229920005989 resin Polymers 0.000 claims description 7
- 239000011347 resin Substances 0.000 claims description 7
- 230000009471 action Effects 0.000 claims description 6
- 238000000465 moulding Methods 0.000 claims description 6
- 238000005303 weighing Methods 0.000 claims description 6
- 238000010008 shearing Methods 0.000 claims description 5
- 238000005520 cutting process Methods 0.000 claims description 4
- 230000003247 decreasing effect Effects 0.000 claims description 4
- 238000001914 filtration Methods 0.000 claims description 4
- 239000012535 impurity Substances 0.000 claims description 4
- 238000012545 processing Methods 0.000 claims description 4
- 238000005086 pumping Methods 0.000 claims description 4
- 230000007423 decrease Effects 0.000 claims description 3
- 238000001802 infusion Methods 0.000 abstract description 12
- 230000008569 process Effects 0.000 abstract description 9
- 241000894006 Bacteria Species 0.000 abstract description 4
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 abstract description 4
- 229910052760 oxygen Inorganic materials 0.000 abstract description 4
- 239000001301 oxygen Substances 0.000 abstract description 4
- 238000004659 sterilization and disinfection Methods 0.000 abstract description 4
- 239000003292 glue Substances 0.000 abstract description 3
- 239000005022 packaging material Substances 0.000 abstract description 3
- 239000000126 substance Substances 0.000 abstract description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 3
- 239000002131 composite material Substances 0.000 abstract description 2
- 238000013329 compounding Methods 0.000 abstract description 2
- 238000010025 steaming Methods 0.000 abstract description 2
- 239000010410 layer Substances 0.000 description 33
- 230000006870 function Effects 0.000 description 6
- 238000004519 manufacturing process Methods 0.000 description 4
- 238000002844 melting Methods 0.000 description 3
- 230000008018 melting Effects 0.000 description 3
- 239000000203 mixture Substances 0.000 description 2
- 229920005604 random copolymer Polymers 0.000 description 2
- 239000004840 adhesive resin Substances 0.000 description 1
- 229920006223 adhesive resin Polymers 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000010411 cooking Methods 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 239000012793 heat-sealing layer Substances 0.000 description 1
- 238000000265 homogenisation Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 229920000092 linear low density polyethylene Polymers 0.000 description 1
- 239000004707 linear low-density polyethylene Substances 0.000 description 1
- 229920001684 low density polyethylene Polymers 0.000 description 1
- 239000004702 low-density polyethylene Substances 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000013021 overheating Methods 0.000 description 1
- 239000012785 packaging film Substances 0.000 description 1
- 229920006280 packaging film Polymers 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 238000006748 scratching Methods 0.000 description 1
- 230000002393 scratching effect Effects 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
Landscapes
- Extrusion Moulding Of Plastics Or The Like (AREA)
Abstract
The invention discloses a preparation method of a sterilizing outer cover film of a medicine bag, and belongs to the technical field of medicine packaging materials. The sterilizing outer cover film of the medicine bag comprises polypropylene and nylon as raw materials; the sterilizing outer cover film of the medicine bag is formed by co-extrusion of seven layers of extruders, and the extrusion temperature is 260-270 ℃. The sterilizing outer cover film of the medicine bag well realizes the protection of a large infusion bag. The nylon-containing composite material can effectively block oxygen, water vapor and bacteria in the air, and can resist high-temperature steaming and sterilizing at 121 ℃. Compared with other processes, the invention is integrally extruded and molded, and does not involve compounding, so that no glue substance exists, and secondary pollution can be prevented in the use process. Meanwhile, because the raw materials are polypropylene and nylon, the infusion bag has high temperature resistance and can bear the high temperature sterilization condition of the large infusion bag at 121 ℃.
Description
Technical Field
The invention belongs to the technical field of medicine packaging materials, and particularly relates to a preparation method of a sterilizing outer cover film of a medicine bag.
Background
At present, a large number of infusion bottles in the market are changed into large infusion bags. And a layer of packaging bag is arranged outside the large infusion bag to protect the infusion bag. At present, the packaging bag is made of pure PP material generally, and the packaging bag made of the material can play a role in protecting foreign matters from friction and scratching in the process of medicine circulation, but cannot directly bear the high-temperature cooking condition in the medical field, and is difficult to meet the oxygen and bacteria resisting requirements. In addition, the packaging bag commonly used at present relates to a compound process in the production process, so that glue substances exist, and secondary pollution is easy to cause in the use process.
Disclosure of Invention
Aiming at the technical defects of the prior art, the invention provides a preparation method of a sterilizing outer cover film of a medicine bag, which aims at solving the technical problems that the outer cover material for an infusion bag cannot withstand the damp-heat sterilization condition and is difficult to meet the oxygen and bacteria resisting requirements at present.
The invention aims to solve the technical problem that the external packaging material for the infusion bag is easy to cause secondary pollution to the medicine in the using process.
In order to achieve the technical purpose, the invention adopts the following technical scheme:
The preparation method of the sterilizing outer cover film of the medicine bag comprises the following raw materials of polypropylene and nylon; the sterilizing outer cover film of the medicine bag is formed by co-extrusion of seven layers of extruders, and the extrusion temperature is 260-270 ℃.
Preferably, the production steps of the sterilizing outer cover film of the medicine bag are as follows:
1) Vacuum automatic pumping;
2) Weighing by a weight weighing hopper;
3) Extruding by an extruder;
4) Filtering by a filter screen;
5) Molding by a molding device;
6) Winding;
7) And (5) packaging.
Preferably, step 1) includes: the interior of the hopper is pumped into a certain vacuum degree by a fan, and the materials are sucked into the hopper through the feeding pipe under the action of atmospheric pressure.
Preferably, step 2) includes: the weight metering hopper measures the actual raw material flow quantity, and the weight metering system adjusts the rotating speed of the extruder screw according to the deviation of the measured actual value and the set value, and correspondingly increases or decreases the extrusion quantity so as to control the thickness of the film.
Preferably, the extruder in step 3) comprises a barrel and a screw; the charging barrel is used as a plasticizing and pressurizing space, a partition heating device and a cooling device are arranged outside the charging barrel, the partition heating device is heated by resistance, and the cooling device is cooled by wind; the screw is divided into a feeding section, a compression section and a homogenizing section, the feeding section conveys raw materials, the compression section shears a melt to generate shearing heat, and the homogenizing section further plasticizes and homogenizes molten resin and enables a material flow to flow out of a machine head runner uniformly in a quantitative and constant-pressure mode.
Preferably, the screen in step 4) filters impurities possibly mixed in the plastic and prevents the non-plasticized material from entering the head, while maintaining a certain pressure to enhance the plasticization of the material.
Preferably, the forming device in step 5) comprises an in-line adjustable manifold device and an automated flat die.
Preferably, the selection plug of the online adjustable flow dividing channel device inputs the melt of each extruder into a flow dividing system according to a designed structure, and the sectional shape of the thickness of each layer of melt is controlled by online adjustment of a flow dividing wing plate and a distribution pin; wherein the splitter blades control the melt flow and the distribution pins adjust the layer thickness distribution.
Preferably, the heating system of the automatic flat die head maintains the temperature of the melt to prevent the adhesion of the die cavity and the flow rate of the melt from decreasing, the gap between the die lips is controlled by a thermal expansion bolt, the geometry of the flow cavity in the die head ensures that the melt is uniformly distributed along the width of the die head, and the thickness of the film is ensured to be uniform along the whole processing width.
Preferably, in step 6), full-automatic duplex surface, center and gap winding is adopted, and automatic film cutting, automatic roll changing and automatic roll unloading are adopted at the same time.
The sterilizing outer cover film of the medicine bag well realizes the protection of a large infusion bag. The nylon-containing composite material can effectively block oxygen, water vapor and bacteria in the air, and can resist high-temperature steaming and sterilizing at 121 ℃.
The extrusion temperature of the invention is about 265 ℃. The heat sealing temperature is 145 deg.C when in use.
The invention discloses a preparation method of a sterilizing outer cover film of a medicine bag. The product is formed into an integral rolled film by coextrusion of seven layers of extruders. Compared with other processes, the invention is integrally extruded and molded, and does not involve compounding, so that no glue substance exists, and secondary pollution can be prevented in the use process. Meanwhile, because the raw materials are polypropylene and nylon, the infusion bag has high temperature resistance and can bear the high temperature sterilization condition of the large infusion bag at 121 ℃.
Detailed Description
Hereinafter, embodiments of the present invention will be described in detail. In order to avoid unnecessary detail, well-known structures or functions will not be described in detail in the following embodiments. Approximating language, as used in the following examples, may be applied to create a quantitative representation that could permissibly vary without resulting in a change in the basic function. Unless defined otherwise, technical and scientific terms used in the following examples have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.
Example 1
The preparation method of the sterilizing outer cover film of the medicine bag comprises the following raw materials of polypropylene and nylon; the sterilizing outer cover film of the medicine bag is formed by co-extrusion of seven layers of extruders, and the extrusion temperature is 260-270 ℃.
The sterilization outer cover film of the medicine bag comprises a layer A, a layer B, a layer C, a layer D, a layer E, a layer F and a layer G in sequence from outside to inside from the cross section of the packaging film, wherein the layer A and the layer C have the same components and are nylon, the layer B and the layer D have the same components and are adhesive resins, the layer E and the layer F have the same components and are random copolymer polypropylene, the layer G is a heat sealing layer and is a blend modified resin of random copolymer polypropylene, low density polyethylene and linear low density polyethylene, the melt index of the blend modified resin is 6.0-6.3G/10min, and the density is 0.905-0.908G/cm 3.
Wherein:
The thickness of the sterilizing outer cover film of the medicine bag is 60-240um, and the thickness ratio of the layer A, the layer B, the layer C, the layer D, the layer E, the layer F and the layer G is 13-14 percent respectively: 13-14%:13-14%:13-14%:14-15%:14-15%:14-15%.
The sample detection results are as follows:
Example 2
Based on the previous embodiment:
The production steps of the sterilizing outer cover film of the medicine bag are as follows:
1) Vacuum automatic pumping;
2) Weighing by a weight weighing hopper;
3) Extruding by an extruder;
4) Filtering by a filter screen;
5) Molding by a molding device;
6) Winding;
7) And (5) packaging.
Step 1) comprises: the interior of the hopper is pumped into a certain vacuum degree by a fan, and the materials are sucked into the hopper through the feeding pipe under the action of atmospheric pressure.
Step 2) comprises: the weight metering hopper measures the actual raw material flow quantity, and the weight metering system adjusts the rotating speed of the extruder screw according to the deviation of the measured actual value and the set value, and correspondingly increases or decreases the extrusion quantity so as to control the thickness of the film.
The extruder in step 3) comprises a barrel and a screw; the charging barrel is used as a plasticizing and pressurizing space, a partition heating device and a cooling device are arranged outside the charging barrel, the partition heating device is heated by resistance, and the cooling device is cooled by wind; the screw is divided into a feeding section, a compression section and a homogenizing section, the feeding section conveys raw materials, the compression section shears a melt to generate shearing heat, and the homogenizing section further plasticizes and homogenizes molten resin and enables a material flow to flow out of a machine head runner uniformly in a quantitative and constant-pressure mode.
The filter screen in step 4) filters impurities possibly mixed in the plastic and prevents the unplasticized material from entering the machine head, and maintains a certain pressure to strengthen the plasticization of the material.
The forming device in the step 5) comprises an online adjustable split-flow channel device and an automatic flat die head.
The melt of each extruder is input into the distribution system according to a designed structure by the selection plug of the online adjustable distribution channel device, and the profile shape of the thickness of each layer of melt is controlled by online adjustment of the distribution wing plates and the distribution pins; wherein the splitter blades control the melt flow and the distribution pins adjust the layer thickness distribution.
The heating system of the automatic flat die head maintains the temperature of the melt to prevent the adhesion of the die cavity and the flow rate of the melt from falling, the gap between the die lips is controlled by a thermal expansion bolt, the geometry of the die cavity in the die head ensures that the melt is uniformly distributed along the width of the die head, and the thickness of the film is ensured to be uniform along the whole processing width.
In the step 6), full-automatic double-station surface, center and gap winding are adopted, and automatic film cutting, automatic roll changing and automatic roll unloading are adopted.
Example 3
The preparation method of the sterilizing outer cover film of the medicine bag comprises the following raw materials of polypropylene and nylon; the sterilizing outer cover film of the medicine bag is formed by co-extrusion of seven layers of extruders, and the extrusion temperature is 260-270 ℃.
The production process is as follows:
(1) Vacuum automatic material pumping device
The interior of the hopper is pumped into a certain vacuum degree by a fan, and the materials are sucked into the hopper through the feeding pipe under the action of atmospheric pressure.
(2) Weight measuring hopper
Each extruder was equipped with a weight metering hopper to measure the actual throughput of raw materials. According to the deviation of the measured actual value and the set value, the weight metering system automatically adjusts the rotating speed of the extruder screw, thereby correspondingly increasing or decreasing the extrusion quantity to control the thickness of the film.
(3) Extrusion machine
① Charging barrel
Both the plasticizing and the pressing process of the plastic take place therein. The outside of the device is provided with a partition heating and cooling device which is respectively used for resistance heating and wind cooling. The purpose of heating is to heat and melt the plastic, and the cooling function is to prevent the plastic from overheating or to cool the plastic rapidly when the vehicle is stopped, so that the resin is prevented from degradation or decomposition. The external friction generated by the cartridge and the plastic provides heat to the plastic, and the flow of the plastic in the cartridge is also determined by the amount of friction between the plastic and the cartridge.
② Screw rod
The plastic in the rotary charging barrel can move forward through the rotary charging barrel, so that the pressurizing and partial heat can be obtained.
The screw is divided into three sections:
A feeding section (charging section)
The function is as follows: and conveying the raw materials. The feed cylinder fluting improves screw rod surface finish, and the water cooling is led to the screw rod center, can improve the conveying ability of screw rod.
B melting section (compression section)
The function is as follows: shearing of the melt generates shearing heat. The spiral groove is gradually reduced, so that the quality of the product can be improved, and the temperature rise and melting of plastics are facilitated. The degree of shrinkage is measured in terms of compression ratio.
C metering section (homogenization section)
The function is as follows: the melted resin is further plasticized uniformly. And the material flow is enabled to flow out evenly from the machine head runner at a constant quantity and constant pressure. The mixing device can improve the uniformity and obtain low-temperature extrusion.
The screw melting capacity depends on the screw speed and barrel temperature.
(4) Filter screen
① Filtering the impurities possibly mixed in the plastic and preventing the unplasticized material from entering the machine head.
② Maintaining a certain pressure and strengthening the plasticization of the material.
(5) Forming device
① Online adjustable shunt device
The selection plug inputs the melt of each extruder into the flow distribution system according to the designed structure, and the sectional shape of the thickness of each layer of melt can be accurately controlled by on-line adjustment of the flow distribution wing plates and the distribution pins.
Action of the splitter blade: controlling melt flow (including flow and velocity)
Action of the distribution pins: adjusting the layer thickness profile is critical to maintaining uniformity of each layer during coextrusion of materials of different viscosities
② Automatic flat die head
The heating system of the a die maintains the melt temperature to prevent sticking to the die cavity and the melt flow rate from decreasing.
The die lip gap is controlled by a thermal expansion bolt, which can ensure high control accuracy of film thickness tolerance.
The geometry of the inner flow cavity of the die head ensures that the melt is uniformly distributed along the width of the die head, and ensures that the thickness of the film is uniform along the whole processing width.
(6) Winding up
And (3) adopting full-automatic duplex position surface, center and gap winding, automatic film cutting, automatic roll changing and automatic roll unloading.
(7) And (5) packaging.
The foregoing describes the embodiments of the present invention in detail, but the description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modification, equivalent replacement, improvement, etc. made within the scope of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. The preparation method of the sterilizing outer cover film of the medicine bag is characterized in that the sterilizing outer cover film of the medicine bag comprises the raw materials of polypropylene and nylon; the sterilizing outer cover film of the medicine bag is formed by co-extrusion of seven layers of extruders, and the extrusion temperature is 260-270 ℃.
2. The method of preparing a sterilized outer cover for a pharmaceutical pack according to claim 1, wherein the method comprises the steps of:
1) Vacuum automatic pumping;
2) Weighing by a weight weighing hopper;
3) Extruding by an extruder;
4) Filtering by a filter screen;
5) Molding by a molding device;
6) Winding;
7) And (5) packaging.
3. The method of preparing a sterilized outer cover for a pharmaceutical package according to claim 2, wherein step 1) comprises: the interior of the hopper is pumped into a certain vacuum degree by a fan, and the materials are sucked into the hopper through the feeding pipe under the action of atmospheric pressure.
4. A method of preparing a sterilized outer cover for a pharmaceutical package according to claim 2, wherein step 2) comprises: the weight metering hopper measures the actual raw material flow quantity, and the weight metering system adjusts the rotating speed of the extruder screw according to the deviation of the measured actual value and the set value, and correspondingly increases or decreases the extrusion quantity so as to control the thickness of the film.
5. The method of preparing a sterilized outer cover for a pharmaceutical package according to claim 2, wherein the extruder of step 3) comprises a barrel and a screw; the charging barrel is used as a plasticizing and pressurizing space, a partition heating device and a cooling device are arranged outside the charging barrel, the partition heating device is heated by resistance, and the cooling device is cooled by wind; the screw is divided into a feeding section, a compression section and a homogenizing section, the feeding section conveys raw materials, the compression section shears a melt to generate shearing heat, and the homogenizing section further plasticizes and homogenizes molten resin and enables a material flow to flow out of a machine head runner uniformly in a quantitative and constant-pressure mode.
6. The method of claim 2, wherein the filter screen in step 4) filters impurities that may be mixed in the plastic and prevents the non-plasticized material from entering the handpiece while maintaining a pressure to enhance the plasticizing of the material.
7. The method of claim 2, wherein the forming means in step 5) comprises an in-line adjustable split-flow device and an automated flat die.
8. The method for preparing the sterilizing jacket film for the medicine bag according to claim 7, wherein the selection plug of the on-line adjustable flow dividing channel device inputs the melt of each extruder into the flow dividing system according to a designed structure, and the sectional shape of the thickness of each layer of melt is controlled by on-line adjusting the flow dividing wing plate and the distribution pin; wherein the splitter blades control the melt flow and the distribution pins adjust the layer thickness distribution.
9. The method of claim 7, wherein the heating system of the automatic flat die maintains the melt temperature to prevent the adhesion of the die cavity and the flow rate of the melt from decreasing, the die lip gap is controlled by a thermal expansion screw, the geometry of the die cavity in the die head is such that the melt is uniformly distributed along the width of the die head, and the film thickness is ensured to be uniform along the whole processing width.
10. The method of claim 2, wherein in step 6), full-automatic duplex surface, center, gap winding is used, and automatic film cutting, automatic roll changing, and automatic roll unloading are used.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410447271.5A CN118024526A (en) | 2024-04-15 | 2024-04-15 | Preparation method of sterilizing outer cover film of medicine bag |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410447271.5A CN118024526A (en) | 2024-04-15 | 2024-04-15 | Preparation method of sterilizing outer cover film of medicine bag |
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| CN118024526A true CN118024526A (en) | 2024-05-14 |
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| CN202410447271.5A Pending CN118024526A (en) | 2024-04-15 | 2024-04-15 | Preparation method of sterilizing outer cover film of medicine bag |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102380991A (en) * | 2010-09-06 | 2012-03-21 | 苏州海顺包装材料有限公司 | Plastic packaging film and preparation method thereof |
| CN106042548A (en) * | 2016-05-13 | 2016-10-26 | 安徽工程大学 | High-barrier composite-layer medical infusion bag |
| CN111806015A (en) * | 2020-07-20 | 2020-10-23 | 山东齐鲁乙烯化工股份有限公司 | Polypropylene high-temperature easy-to-tear food packaging film and preparation method thereof |
| CN112318891A (en) * | 2020-09-29 | 2021-02-05 | 厦门长塑实业有限公司 | High-barrier antibacterial nylon composite film and preparation method thereof |
| CN112873783A (en) * | 2021-02-01 | 2021-06-01 | 吴刚 | Forming device and process for producing gelatin composite geomembrane |
-
2024
- 2024-04-15 CN CN202410447271.5A patent/CN118024526A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102380991A (en) * | 2010-09-06 | 2012-03-21 | 苏州海顺包装材料有限公司 | Plastic packaging film and preparation method thereof |
| CN106042548A (en) * | 2016-05-13 | 2016-10-26 | 安徽工程大学 | High-barrier composite-layer medical infusion bag |
| CN111806015A (en) * | 2020-07-20 | 2020-10-23 | 山东齐鲁乙烯化工股份有限公司 | Polypropylene high-temperature easy-to-tear food packaging film and preparation method thereof |
| CN112318891A (en) * | 2020-09-29 | 2021-02-05 | 厦门长塑实业有限公司 | High-barrier antibacterial nylon composite film and preparation method thereof |
| CN112873783A (en) * | 2021-02-01 | 2021-06-01 | 吴刚 | Forming device and process for producing gelatin composite geomembrane |
Non-Patent Citations (1)
| Title |
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| 李祖德编: "《塑料加工技术应用手册》", 30 June 1997, 中国物资出版社, pages: 415 - 419 * |
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