CN116394613A - Easily torn medicine bag film, preparation method and packaging bag - Google Patents
Easily torn medicine bag film, preparation method and packaging bag Download PDFInfo
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- CN116394613A CN116394613A CN202310267073.6A CN202310267073A CN116394613A CN 116394613 A CN116394613 A CN 116394613A CN 202310267073 A CN202310267073 A CN 202310267073A CN 116394613 A CN116394613 A CN 116394613A
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- density polyethylene
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- 239000003814 drug Substances 0.000 title claims abstract description 36
- 238000004806 packaging method and process Methods 0.000 title claims abstract description 18
- 238000002360 preparation method Methods 0.000 title abstract description 6
- 229920000092 linear low density polyethylene Polymers 0.000 claims abstract description 90
- 239000004707 linear low-density polyethylene Substances 0.000 claims abstract description 90
- 229920001684 low density polyethylene Polymers 0.000 claims abstract description 48
- 239000004702 low-density polyethylene Substances 0.000 claims abstract description 48
- 239000002184 metal Substances 0.000 claims abstract description 40
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 20
- 239000005038 ethylene vinyl acetate Substances 0.000 claims abstract description 20
- 229920001200 poly(ethylene-vinyl acetate) Polymers 0.000 claims abstract description 20
- 238000002844 melting Methods 0.000 claims description 65
- 230000008018 melting Effects 0.000 claims description 65
- 238000001125 extrusion Methods 0.000 claims description 23
- 238000007664 blowing Methods 0.000 claims description 14
- 238000010096 film blowing Methods 0.000 claims description 13
- 238000000034 method Methods 0.000 claims description 11
- 238000002156 mixing Methods 0.000 claims description 11
- 238000001816 cooling Methods 0.000 claims description 10
- 229940079593 drug Drugs 0.000 claims description 9
- 239000000203 mixture Substances 0.000 claims description 9
- VGGSQFUCUMXWEO-UHFFFAOYSA-N Ethene Chemical compound C=C VGGSQFUCUMXWEO-UHFFFAOYSA-N 0.000 claims description 8
- 230000007246 mechanism Effects 0.000 claims description 6
- 238000005096 rolling process Methods 0.000 claims description 6
- 229920003312 Appeel® Polymers 0.000 claims description 3
- 238000007789 sealing Methods 0.000 abstract description 23
- 239000000463 material Substances 0.000 abstract description 9
- 239000002994 raw material Substances 0.000 abstract description 7
- 239000012634 fragment Substances 0.000 abstract 1
- 239000011148 porous material Substances 0.000 abstract 1
- 239000004698 Polyethylene Substances 0.000 description 7
- 239000007788 liquid Substances 0.000 description 7
- 238000012856 packing Methods 0.000 description 5
- 239000002131 composite material Substances 0.000 description 4
- 229920003023 plastic Polymers 0.000 description 4
- 239000004033 plastic Substances 0.000 description 4
- 230000008569 process Effects 0.000 description 3
- 239000002699 waste material Substances 0.000 description 3
- 239000011521 glass Substances 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 239000000155 melt Substances 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 241001391944 Commicarpus scandens Species 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 230000001010 compromised effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000001066 destructive effect Effects 0.000 description 1
- 230000035622 drinking Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000012785 packaging film Substances 0.000 description 1
- 229920006280 packaging film Polymers 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- -1 polyethylene Polymers 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
- 229920000098 polyolefin Polymers 0.000 description 1
- 239000010902 straw Substances 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
Classifications
-
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C55/00—Shaping by stretching, e.g. drawing through a die; Apparatus therefor
- B29C55/28—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of blown tubular films, e.g. by inflation
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
- B32B27/08—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/18—Layered products comprising a layer of synthetic resin characterised by the use of special additives
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- B65D31/00—Bags or like containers made of paper and having structural provision for thickness of contents
- B65D31/02—Bags or like containers made of paper and having structural provision for thickness of contents with laminated walls
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2250/00—Layers arrangement
- B32B2250/03—3 layers
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2250/00—Layers arrangement
- B32B2250/24—All layers being polymeric
- B32B2250/242—All polymers belonging to those covered by group B32B27/32
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2307/00—Properties of the layers or laminate
- B32B2307/30—Properties of the layers or laminate having particular thermal properties
- B32B2307/31—Heat sealable
-
- 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
- B32B2439/00—Containers; Receptacles
- B32B2439/02—Open containers
- B32B2439/06—Bags, sacks, sachets
-
- 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
- B32B2553/00—Packaging equipment or accessories not otherwise provided for
Abstract
The invention provides an easy-tearing medicine bag film, a preparation method and a packaging bag, wherein the easy-tearing medicine bag film comprises an outer layer film, a middle layer film and an inner layer film; the thickness of the inner layer film accounts for 20-40% of the total thickness, and the raw materials comprise first linear low density polyethylene, first metal linear low density polyethylene, first low density polyethylene, ethylene-vinyl acetate copolymer, a pore opening agent, a slipping agent and PPA; the thickness of the middle layer film accounts for 30% -50% of the total thickness, and the raw materials comprise first linear low-density polyethylene, first low-density polyethylene and second metal linear low-density polyethylene; the thickness of the outer layer film accounts for 20% -40% of the total thickness, and the raw materials comprise second linear low-density polyethylene, second low-density polyethylene and second metal linear low-density polyethylene. The invention realizes the heat sealing between the inner films at a lower temperature, ensures the reliability of the heat sealing, and realizes that the films at the two sides can not fall off any material and generate fragments after the heat sealing part of the bag mouth is forcefully torn.
Description
Technical Field
The invention belongs to the technical field of packaging films, and particularly relates to an easy-tearing medicine bag film, a preparation method and a packaging bag.
Background
At present, most of liquid medicines commonly used in the medicine field are stored in glass bottles or plastic containers, but the glass bottles are heavy and easy to break, the plastic containers need a bottom support to be used as a support of the plastic containers, and when the liquid medicine is used, the top of the plastic containers needs to be unscrewed, and then the liquid medicine is extruded for oral administration, so that the liquid medicine is inconvenient to use and high in cost.
Along with the demand of people to medicine package is higher and higher, the compound flexible package for splendid attire liquid medicine begins to appear, generally adopts PE film material, because the PE film of inlayer belongs to same material, its heat seal intensity is very high, if want to tear the packing after the heat seal, can only break PE heat seal layer or tear the rotten sack and just can open the packing, but often the user can tear the partly material of packing when tearing the packing along tearing the mouth, produces the waste material, and tear the in-process moreover, easily produces the packing piece, has the risk of falling into medicine.
Disclosure of Invention
The invention aims to overcome the defects in the prior art, and provides an easily torn medicine bag film, a preparation method and a packaging bag, which solve the problems of difficult package tearing, waste generation, easy chip generation and the like in the prior art.
In a first aspect, the invention provides an easily torn medicine bag film, which comprises an outer layer film, a middle layer film and an inner layer film which are tightly attached in sequence from outside to inside;
the thickness of the inner layer film accounts for 20-40% of the total thickness, and the inner layer film comprises 10-15% of first linear low density polyethylene, 3-8% of first metal linear low density polyethylene, 40-60% of first low density polyethylene, 20-40% of ethylene-vinyl acetate copolymer, 1% of opening agent, 1% of slipping agent and 0.5% of PPA;
the thickness of the middle layer film accounts for 30-50% of the total thickness, and the middle layer film comprises 55-75% of first linear low density polyethylene, 20-40% of first low density polyethylene and 3-8% of second metal linear low density polyethylene;
the thickness of the outer layer film accounts for 20-40% of the total thickness, and the outer layer film comprises 55-75% of second linear low density polyethylene, 20-40% of second low density polyethylene and 3-8% of second metal linear low density polyethylene.
In some embodiments, the first linear low density polyethylene and the second linear low density polyethylene have the same melting point and melting point parameters, the first low density polyethylene and the second low density polyethylene have the same melting point and melting point parameters, and the first metal linear low density polyethylene has a melting point lower than the first linear low density polyethylene, the second linear low density polyethylene, the first low density polyethylene, and the second low density polyethylene.
In some embodiments, the ethylene vinyl acetate copolymer has a higher melting point parameter than the first metal linear low density polyethylene and the ethylene vinyl acetate copolymer has a lower melting point parameter than the first metal linear low density polyethylene.
In some embodiments, the inner film, middle film, and outer film have a thickness ratio of 3:4:3.
In some embodiments, the first linear low density polyethylene is a karta LLDPE Q2018H, melt index 2 g/10 min, melt point 110 ℃;
the first-order metal linear low-density polyethylene is Primann SP0540, the melting point is 3.8 g/10 min, and the melting point is 98 ℃;
the first low-density polyethylene is middle sea shell LDPE 2426K, melting finger is 4 g/10 min, and melting point is 110-112 ℃;
the ethylene-vinyl acetate copolymer is DuPont APPEEL 11D542, the melting point is 10 g/10 min, and the melting point is 88 ℃;
the opening agent is Beijing Asian AB-20LD; the slipping agent is Beijing Asian SLIP-7; the PPA is Beijing Asian PPA-A1058.
In some embodiments, the second metallic linear low density polyethylene is akkersen mobil MLLDPE1327CA with a melt index of 1.3 g/10 min, a melt point of 140 ℃;
the second linear low-density polyethylene is a metallocene petrochemical LLDPE7042, the melting point is 2 g/10 min, and the melting point is 110 ℃;
the second low-density polyethylene is middle sea shell LDPE 2420D, melting point is 4 g/10 min, and melting point is 110-112 ℃.
In a second aspect, the present invention provides a method for preparing a tearable drug film according to any one of the preceding embodiments, comprising the steps of:
uniformly mixing 10-15% by weight of first linear low-density polyethylene, 3-8% by weight of first metal linear low-density polyethylene, 40-60% by weight of first low-density polyethylene, 20-40% by weight of ethylene-vinyl acetate copolymer, 1% by weight of opening agent, 1% by weight of slipping agent and 0.5% by weight of PPA, and feeding the mixture into an inner layer hopper of a three-layer coextrusion film blowing machine;
uniformly mixing 55-75% by weight of first linear low-density polyethylene, 20-40% by weight of first low-density polyethylene and 3-8% by weight of second metal linear low-density polyethylene, and feeding the mixture to a middle layer hopper of a three-layer coextrusion film blowing machine;
uniformly mixing 55-75% by weight of second linear low-density polyethylene, 20-40% by weight of second low-density polyethylene and 3-8% by weight of second metal linear low-density polyethylene, and feeding the mixture to an outer layer hopper of a three-layer coextrusion film blowing machine;
setting the working temperature of each screw extrusion mechanism in the three-layer co-extrusion film blowing machine, extruding by the screw extrusion mechanism to form a three-layer film structure, blowing the film, introducing air from an extrusion die head for blowing and cooling, wherein the air cooling temperature is set to be 12-15 ℃, the blowing ratio is 1:1.3-1:1.8, and forming the easily torn medicine bag film through traction, rolling and rolling.
In some embodiments, the components of the inner film, the middle film, and the outer film are dosed in a weight ratio of 3:4:3.
In some embodiments, the inner layer screw extrusion structure operates at a temperature in the range of 150 to 155 ℃, the middle layer screw extrusion structure operates at a temperature in the range of 160 to 165 ℃, the outer layer screw extrusion structure operates at a temperature in the range of 155 to 160 ℃, the die runner temperature 160 to 165 ℃, and the die temperature 165 ℃.
In a third aspect, the present invention further provides a packaging bag prepared by using the easy-tearing drug package film according to any one of the foregoing embodiments.
The invention has the beneficial effects that:
therefore, according to the embodiment of the disclosure, the easily torn medicine bag film manufactured by the components and the process, the inner layer film utilizes the excellent low temperature heat sealability of the first metal linear low density polyethylene and the good heat sealability of the first linear low density polyethylene, the heat sealing between the inner layer films is realized at a lower temperature, the heat sealing reliability is ensured, meanwhile, the strippability of ethylene-vinyl acetate copolymer is utilized, after the bag mouth heat sealing part is torn by force, the films on two sides do not fall off any material, the separated films on two sides form a complete open bag, no scraps are generated, and the appearance of the packaging bag is not damaged.
Detailed Description
The following description of the present invention will be made clearly and fully, and it is apparent that the embodiments described are some, but not all, of the embodiments of the present invention. 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.
In the description of the present invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," "outer," and the like indicate orientations or positional relationships merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the devices or elements being referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, when it is described that a specific device is located between a first device and a second device, an intervening device may or may not be present between the specific device and the first device or the second device. When it is described that a particular device is connected to other devices, the particular device may be directly connected to the other devices without intervening devices, or may be directly connected to the other devices without intervening devices.
Techniques, methods, and apparatus known to one of ordinary skill in the relevant art may not be discussed in detail, but are intended to be part of the specification where appropriate.
Applicants' studies found that:
in the prior art, when the composite flexible package is used for containing liquid medicines, as the inner film is generally a PE film, the heat sealing strength of the two layers of PE films is very high, the heat sealing performance is very good after heat sealing, but the heat sealing position is difficult to be pulled away from the non-destructive condition, and the current common practice is that a tearing opening is preset in a packaging bag and used for tearing along the tearing opening, so that two problems exist in the mode: firstly, scraps and waste materials are generated after tearing, and the scraps have the risk of being mixed into medicines; secondly, the integrity of the package is compromised and the package is difficult to use as an open bag. Moreover, the composite flexible package containing the liquid medicine is often heated in hot water, and under the condition of temperature increase, the two PE films are more difficult to tear, and the packaging bag is more easily damaged.
In view of this, in a first aspect, there is provided in the present disclosure an easy-to-tear film comprising an outer film, a middle film and an inner film which are closely laminated in this order from the outside to the inside;
the thickness of the inner layer film accounts for 20-40% of the total thickness, and the inner layer film comprises 10-15% of first linear low density polyethylene, 3-8% of first metal linear low density polyethylene, 40-60% of first low density polyethylene, 20-40% of ethylene-vinyl acetate copolymer, 1% of opening agent, 1% of slipping agent and 0.5% of PPA;
the thickness of the middle layer film accounts for 30-50% of the total thickness, and the middle layer film comprises 55-75% of first linear low density polyethylene, 20-40% of first low density polyethylene and 3-8% of second metal linear low density polyethylene;
the thickness of the outer layer film accounts for 20-40% of the total thickness, and the outer layer film comprises 55-75% of second linear low density polyethylene, 20-40% of second low density polyethylene and 3-8% of second metal linear low density polyethylene.
In the inner film, the excellent low temperature heat sealability of the first linear low density polyethylene and the good heat sealability of the first linear low density polyethylene are utilized, the heat sealing between the inner films can be realized at a lower temperature, the heat sealing reliability is ensured, meanwhile, the peelability of the ethylene-vinyl acetate copolymer is utilized, the integrity after peeling between the two inner films is realized, when the two inner films are subjected to peeling force in opposite directions after heat sealing, the two inner films are separated at the heat sealing position, no material is separated in the process, the structural integrity of the two inner films is ensured, the separated two films form a complete opening bag, chips are not generated, the appearance of the packaging bag is not damaged, and a user can still be used for holding other garbage after peeling the two films, or inserting a straw for drinking.
In this embodiment, the melting points and melting point parameters of the first linear low-density polyethylene and the second linear low-density polyethylene are the same, the melting points and melting point parameters of the first low-density polyethylene and the second low-density polyethylene are the same, the composite binding force of the outer layer film, the middle layer film and the inner layer film in the composite forming medicine bag film is improved, the melting point of the first metal linear low-density polyethylene is lower than that of the first linear low-density polyethylene, the second linear low-density polyethylene, the first low-density polyethylene and the second low-density polyethylene, extrusion at a lower inner layer screw extrusion temperature is achieved by adding the first metal linear low-density polyethylene with a lower melting point, and heat sealing of the two inner layer films is achieved at a lower heat sealing temperature.
In addition, when the packaging bag prepared by the easy-tearing medicine bag film is used for being placed in hot water for heating or other heating environments, the temperature of the easy-tearing medicine bag film can be increased, and in order to improve the high temperature resistance of the packaging bag, the heat sealing of the packaging bag cannot be failed at high temperature, so that the first metal linear low-density polyethylene is added in the embodiment, the heat sealing performance at high temperature is improved, and the packaging bag is more stable.
In this embodiment, the ethylene-vinyl acetate copolymer has a higher melting point parameter than the first-order metal linear low-density polyethylene, the ethylene-vinyl acetate copolymer has a lower melting point parameter than the first-order metal linear low-density polyethylene, and the ethylene-vinyl acetate copolymer has a higher melting point and a lower melting point so as to reflect the peelability of the ethylene-vinyl acetate copolymer, so that the heat-sealed two-layer inner film can be torn without damage under the action of external force, and the torn structure cannot be damaged.
Example 1:
in this example 1, the inner film thickness was 30% of the total thickness and consisted of the following materials:
the first linear low-density polyethylene is Katal LLDPE Q2018H, the melting point is 2 g/10 min, the melting point is 110 ℃, and the weight part accounts for 12.5%;
the first metal linear low density polyethylene is Primann SP0540, melting point is 3.8 g/10 min, melting point is 98 ℃, and weight ratio is 5%;
the first low-density polyethylene is middle sea shell LDPE 2426K, melting point is 4 g/10 min, melting point is 110-112 ℃, and weight ratio is 50%;
the ethylene-vinyl acetate copolymer is DuPont APPEEL 11D542, the melting point is 10 g/10 min, the melting point is 88 ℃, and the weight ratio is 30%;
the opening agent is Beijing Asian AB-20LD, and the weight ratio is 1%;
the slipping agent is Beijing Asian SLIP-7, and the weight ratio is 1 percent;
PPA is Beijing Asian PPA-A1058, and the weight ratio is 0.5%.
The thickness of the middle layer film accounts for 40% of the total thickness, and consists of the following raw materials:
the first linear low-density polyethylene is Katal LLDPE Q2018H, the melting point is 2 g/10 min, the melting point is 110 ℃, and the weight part accounts for 65%;
the first low-density polyethylene is middle sea shell LDPE 2426K, melting point is 4 g/10 min, melting point is 110-112 ℃, and weight part accounts for 30%;
the second-dicyclopentadienyl metal linear low-density polyethylene is Ackerson Mobil MLLDPE1327CA, the melting point is 1.3 g/10 min, the melting point is 140 ℃, and the weight part is 5%.
The thickness of the outer layer film accounts for 30% of the total thickness, and consists of the following raw materials:
the second linear low density polyethylene is a metallocene petrochemical LLDPE7042, the melting point is 2 g/10 min, the melting point is 110 ℃, and the weight part accounts for 65%;
the second low-density polyethylene is middle sea shell LDPE 2420D, melting point is 4 g/10 min, melting point is 110-112 ℃, and weight part accounts for 30%;
the second-dicyclopentadienyl metal linear low-density polyethylene is Ackerson Mobil MLLDPE1327CA, the melting point is 1.3 g/10 min, the melting point is 140 ℃, and the weight part is 5%.
It should be noted that, in the inner film, the katal LLDPE Q2018H mainly provides good heat sealability, the japanese priman SP0540 mainly provides excellent low-temperature heat sealability, the middle sea shell LDPE 2426K mainly provides stiffness and glossiness, the dupont apeel 11D542 mainly provides peelability, and by the combination of the above four raw materials in a specific ratio, the good heat sealability and peelability of the inner film are achieved, and the inner film has a peelability function after good heat sealing.
Example 2:
in this example 2, a method for preparing a tearable drug film applied to example 1 is provided, which comprises the following steps:
uniformly mixing 12.5% by weight of first linear low-density polyethylene, 5% by weight of first metal linear low-density polyethylene, 50% by weight of first low-density polyethylene, 30% by weight of ethylene-vinyl acetate copolymer, 1% by weight of opening agent, 1% by weight of slipping agent and 0.5% by weight of PPA, and feeding the mixture into an inner layer hopper of a three-layer coextrusion film blowing machine;
uniformly mixing 65% by weight of first linear low-density polyethylene, 30% by weight of first low-density polyethylene and 5% by weight of second metal linear low-density polyethylene, and feeding the mixture to a middle layer hopper of a three-layer coextrusion film blowing machine;
uniformly mixing 65% by weight of second linear low-density polyethylene, 30% by weight of second low-density polyethylene and 5% by weight of second metal linear low-density polyethylene, and feeding the mixture to an outer layer hopper of a three-layer coextrusion film blowing machine;
wherein the components of the inner layer film, the middle layer film and the outer layer film are fed according to the weight ratio of 3:4:3;
setting the working temperature of each screw extrusion mechanism in the three-layer co-extrusion film blowing machine, extruding by the screw extrusion mechanism to form a three-layer film structure, blowing the film, introducing air from an extrusion die head for blowing and cooling, wherein the air cooling temperature is set to be 12-15 ℃, the blowing ratio is 1:1.3-1:1.8, and forming the easily torn medicine bag film through traction, rolling and rolling.
In this embodiment, the easily torn medicine bag film is made by blending polyethylene/polyolefin with different physical properties, and blowing and cooling on the inner, middle and outer three layers, specifically, the air cooling temperature is controlled to be 12-15 ℃, the blowing ratio is controlled to be 1:1.3-1:1.8, because of the addition of the japanese priman SP0540 and dupont apeel 11D542, the melting point of the inner film is low, the cooling effect of the film just blown is poor, the film produced by the three-layer coextrusion film blowing machine is a tube material, before winding, the two single films before and after edge cutting are required to be respectively wound, the two films after edge cutting are still difficult to separate and cannot be wound or wound well, so the embodiment controls the blowing ratio to be 1:1.3-1:1.8, preferably, the blowing ratio is 1:1.3, and the film can be wound smoothly under the optimal blowing ratio.
In addition, under the inflation ratio, the raw material types of each layer of film are selected, the working temperature range of the inner layer screw extrusion structure is controlled to be 150-155 ℃, the working temperature range of the middle layer screw extrusion structure is controlled to be 160-165 ℃, the working temperature range of the outer layer screw extrusion structure is controlled to be 155-160 ℃, the die flow channel temperature is 160-165 ℃, and the die mouth temperature is 165 ℃, at the temperature, the problems that the film bubble is unstable and the cooling difficulty is caused due to the overhigh temperature are avoided, and the phenomenon that the temperature is insufficient due to the overlow temperature is avoided.
In a third aspect, the present disclosure provides a packaging bag, which is prepared by using the tearable drug bag film according to any one of the foregoing embodiments, where the two tearable drug bag films have the same heat seal strength and sealing property, and after the two inner layer films are heat sealed, the two inner layer films can be separated from the heat seal when they need to be torn, the bag can be intact, the content will not overflow due to tearing of the bag, and the structural layer can be peeled off without damage.
Compared with the prior art, the invention provides the easy-tearing medicine bag film, the preparation method and the packaging bag, wherein the easy-tearing medicine bag film is prepared by the components and the process, the inner layer film of the easy-tearing medicine bag film utilizes the excellent low-temperature heat sealability of the first metal linear low-density polyethylene and the good heat sealability of the first linear low-density polyethylene, the heat sealing between the inner layer films is realized at a lower temperature, the heat sealing reliability is ensured, and simultaneously, the strippability of ethylene-vinyl acetate copolymer is utilized, so that after the film on two sides is torn by force at the heat sealing position of the bag opening, no material is peeled off, and the separated films on two sides form a complete opening bag without generating scraps and damaging the appearance of the packaging bag.
Finally, it should be emphasized that the present invention is not limited to the above-described embodiments, but is merely preferred embodiments of the invention, and any modifications, equivalents, improvements, etc. within the spirit and principles of the invention are intended to be included within the scope of the invention.
Claims (10)
1. The easily torn medicine bag film is characterized by comprising an outer layer film, a middle layer film and an inner layer film which are tightly attached in sequence from outside to inside;
the thickness of the inner layer film accounts for 20-40% of the total thickness, and the inner layer film comprises 10-15% of first linear low density polyethylene, 3-8% of first metal linear low density polyethylene, 40-60% of first low density polyethylene, 20-40% of ethylene-vinyl acetate copolymer, 1% of opening agent, 1% of slipping agent and 0.5% of PPA;
the thickness of the middle layer film accounts for 30-50% of the total thickness, and the middle layer film comprises 55-75% of first linear low density polyethylene, 20-40% of first low density polyethylene and 3-8% of second metal linear low density polyethylene;
the thickness of the outer layer film accounts for 20-40% of the total thickness, and the outer layer film comprises 55-75% of second linear low density polyethylene, 20-40% of second low density polyethylene and 3-8% of second metal linear low density polyethylene.
2. The easy-tear film of claim 1, wherein the first linear low density polyethylene and the second linear low density polyethylene have the same melting point parameter, the first low density polyethylene and the second low density polyethylene have the same melting point parameter, and the first metal linear low density polyethylene has a melting point lower than the first linear low density polyethylene, the second linear low density polyethylene, the first low density polyethylene, and the second low density polyethylene.
3. The easy-tear film of claim 2 wherein said ethylene vinyl acetate copolymer has a higher melt index than said first metal linear low density polyethylene and a lower melt index than said first metal linear low density polyethylene.
4. A frangible pouch film according to claim 3, wherein said inner, middle and outer films have a thickness ratio of 3:4:3.
5. An easy-to-tear film according to any one of claim 1 to 4,
the first linear low-density polyethylene is Katal LLDPE Q2018H, the melting point is 2 g/10 min, and the melting point is 110 ℃;
the first-order metal linear low-density polyethylene is Primann SP0540, the melting point is 3.8 g/10 min, and the melting point is 98 ℃;
the first low-density polyethylene is middle sea shell LDPE 2426K, melting finger is 4 g/10 min, and melting point is 110-112 ℃;
the ethylene-vinyl acetate copolymer is DuPont APPEEL 11D542, the melting point is 10 g/10 min, and the melting point is 88 ℃;
the opening agent is Beijing Asian AB-20LD; the slipping agent is Beijing Asian SLIP-7; the PPA is Beijing Asian PPA-A1058.
6. The easy-tearing pharmaceutical film according to claim 5, wherein the second metal linear low density polyethylene is axsimil MLLDPE1327CA with a melting point of 1.3 g/10 min and a melting point of 140 ℃;
the second linear low-density polyethylene is a metallocene petrochemical LLDPE7042, the melting point is 2 g/10 min, and the melting point is 110 ℃;
the second low-density polyethylene is middle sea shell LDPE 2420D, melting point is 4 g/10 min, and melting point is 110-112 ℃.
7. A method of preparing a tear-off drug film according to any one of claims 1 to 6, comprising the steps of:
uniformly mixing 10-15% by weight of first linear low-density polyethylene, 3-8% by weight of first metal linear low-density polyethylene, 40-60% by weight of first low-density polyethylene, 20-40% by weight of ethylene-vinyl acetate copolymer, 1% by weight of opening agent, 1% by weight of slipping agent and 0.5% by weight of PPA, and feeding the mixture into an inner layer hopper of a three-layer coextrusion film blowing machine;
uniformly mixing 55-75% by weight of first linear low-density polyethylene, 20-40% by weight of first low-density polyethylene and 3-8% by weight of second metal linear low-density polyethylene, and feeding the mixture to a middle layer hopper of a three-layer coextrusion film blowing machine;
uniformly mixing 55-75% by weight of second linear low-density polyethylene, 20-40% by weight of second low-density polyethylene and 3-8% by weight of second metal linear low-density polyethylene, and feeding the mixture to an outer layer hopper of a three-layer coextrusion film blowing machine;
setting the working temperature of each screw extrusion mechanism in the three-layer co-extrusion film blowing machine, extruding by the screw extrusion mechanism to form a three-layer film structure, blowing the film, introducing air from an extrusion die head for blowing and cooling, wherein the air cooling temperature is set to be 12-15 ℃, the blowing ratio is 1:1.3-1:1.8, and forming the easily torn medicine bag film through traction, rolling and rolling.
8. The method of claim 6, wherein the inner film, the middle film and the outer film are prepared by mixing the components in a weight ratio of 3:4:3.
9. The method of claim 7, wherein the inner layer screw extrusion structure has an operating temperature ranging from 150 to 155 ℃, the middle layer screw extrusion structure has an operating temperature ranging from 160 to 165 ℃, the outer layer screw extrusion structure has an operating temperature ranging from 155 to 160 ℃, the die flow channel has a temperature ranging from 160 to 165 ℃, and the die has a temperature of 165 ℃.
10. A packaging bag prepared by using the easy-to-tear film according to any one of claims 1 to 6.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310267073.6A CN116394613A (en) | 2023-03-20 | 2023-03-20 | Easily torn medicine bag film, preparation method and packaging bag |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310267073.6A CN116394613A (en) | 2023-03-20 | 2023-03-20 | Easily torn medicine bag film, preparation method and packaging bag |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN116394613A true CN116394613A (en) | 2023-07-07 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310267073.6A Pending CN116394613A (en) | 2023-03-20 | 2023-03-20 | Easily torn medicine bag film, preparation method and packaging bag |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN116394613A (en) |
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2023
- 2023-03-20 CN CN202310267073.6A patent/CN116394613A/en active Pending
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