Environment-friendly medical packaging bag resistant to steam sterilization

Abstract

The utility model discloses an environmental protection type medical packaging bag of resisting steam sterilization, medical sterilization packaging bag is connected by three edge heat pressure seal ironing from upper sheet material and lower sheet material, and the part of not seal ironing connection forms the bag mouth, and the part opposite with bag mouth is bag bottom, the upper sheet material is PP easy to uncover the film, the lower sheet material is compounded from SMMS non -woven fabric and PP film through the dispersion point shape heat pressure process, the PP film is towards the bag body inside, and the PP film has the even distribution of a plurality of micropore formed through laser processing on. According to the utility model, provide a kind of medical packaging bag of resisting steam sterilization, breathable bacteria -resistant, clean peeling, environmental protection recyclable.

Description

Technical Field

[0001] This utility model relates to the field of medical packaging materials technology, and more specifically to an environmentally friendly, steam-sterilizable medical packaging bag. Background Technology

[0002] In the field of medical device sterilization packaging, steam sterilization (such as moist heat sterilization) is one of the most commonly used sterilization methods. Packaging materials must meet the following core requirements: Steam sterilization resistance: able to withstand high temperature (usually 121℃-134℃) and high pressure environments without damage, deformation, or material degradation; Breathable and antimicrobial: allows steam to penetrate during sterilization to kill microorganisms, while preventing the invasion of external microorganisms after sterilization; Clean peeling: no fibers or debris fall off when the packaging is opened, avoiding secondary contamination of the devices.

[0003] However, traditional medical sterilization packaging bags have the following shortcomings: a single material cannot simultaneously meet the requirements of breathability and antibacterial properties. For example, non-woven fabrics have good breathability but cannot be cleanly peeled and opened after sealing and ironing, while plastic films have strong antibacterial properties but poor breathability; composite structures are not environmentally friendly, and some materials are not recyclable or release harmful substances after sterilization.

[0004] Therefore, there is an urgent need for a medical packaging bag with optimized structure that takes into account sterilization resistance, air permeability and antibacterial properties, clean peelability and environmental protection requirements. Summary of the Invention

[0005] The purpose of this invention is to provide an environmentally friendly medical packaging bag that is resistant to steam sterilization, thereby solving the problem that existing medical packaging bags cannot simultaneously meet the requirements of sterilization resistance, air permeability and antibacterial properties, clean peeling and environmental protection.

[0006] According to this utility model, an environmentally friendly, steam-resistant sterilization-resistant medical packaging bag is provided. The medical sterilization packaging bag is formed by connecting an upper sheet and a lower sheet through a three-sided hot-pressing process. The unsealed part forms the bag opening, and the part opposite to the bag opening forms the bag bottom. The upper sheet is a PP easy-peel film, and the lower sheet is formed by combining SMMS non-woven fabric and PP film through a dispersed dot hot-pressing process. The PP film faces the inside of the bag and has a plurality of micropores uniformly distributed on it through laser processing.

[0007] Preferably, the SMMS nonwoven fabric and the PP film are combined by a hot pressing process to form a plurality of dispersed heat-pressing points, the diameter of the heat-pressing points is 1-2mm, and the distance between adjacent heat-pressing points is 15-35mm.

[0008] Preferably, the conditions for the dispersed point hot pressing process are: temperature 170-200℃, pressure 0.3-0.5MPa, and sealing time 1.5-3.5s.

[0009] Preferably, the pore size of the micropores formed on the PP film by laser processing is 100-500μm, and the pore spacing is 2-5mm.

[0010] Preferably, the density of micropores formed on the PP film by laser processing is 6-25 per cm², which meets the gas exchange requirements during steam sterilization.

[0011] Preferably, the hot pressing conditions for the upper sheet and the lower sheet are: temperature 170-220℃, pressure 0.3-0.5MPa, and sealing time 1.5-4s.

[0012] Preferably, the peel force between the PP film and the PP easy-peel film is controlled at 2.0-7.0 N / 15 mm to meet the requirements for medical clean peeling.

[0013] Preferably, the thickness of the PP easy-peel film is 60-80μm and the surface tension is 30-35mN / m.

[0014] Preferably, the SMMS nonwoven fabric has a basis weight of 30-40 g / m², and the PP film has a thickness of 25-35 μm.

[0015] Preferably, the bottom of the bag has a V-shaped structure.

[0016] This utility model aims to provide an environmentally friendly, steam-resistant (EFP structure) medical packaging bag that meets multiple performance requirements for medical steam-sterilization packaging through material combination and structural design.

[0017] The upper sheet, also known as the easy-peel clean release layer, is made of PP easy-peel film (modified polypropylene film, surface tension 30-35 mN / m). It features low peel force and good transparency, and can be cleanly peeled off after being sealed with the lower PP film. It should be understood that both the PP easy-peel film and the PP film are primarily made of PP (polypropylene), processed into films through blow molding or casting, but with slight differences. The difference lies in the addition of special additives, such as slip agents and anti-blocking agents, or special surface treatments during the PP easy-peel film processing to modify the film's surface properties, reduce the adhesion between the film and the substrate, and thus make it easy to peel off.

[0018] The lower sheet, also known as the sterilization-resistant, breathable, and antibacterial layer, is made of SMMS nonwoven fabric and PP film bonded together through a dispersed dot-matrix heat pressing process. The SMMS nonwoven fabric faces outwards from the bag, while the PP film faces inwards. The SMMS nonwoven fabric is a four-layer (spunbond-meltblown-meltblown-spunbond) nonwoven fabric made from polypropylene (PP), possessing excellent microbial barrier properties, effectively preventing bacteria and other microorganisms from penetrating. It is also soft and resistant to moisture and heat. The PP film is made of food-grade polypropylene film, laser-processed to form uniformly distributed micropores. Preferably, the pore size is 100-500 μm, the pore spacing is 2-5 mm, and the micropore density is 6-25 pores / cm², meeting the gas exchange requirements during steam sterilization.

[0019] SMMS nonwoven fabric and PP film are bonded together through a hot-pressing process. The hot-pressing points are scattered, with a diameter of 1-2mm and a spacing of 15-35mm. The hot-pressing conditions are: temperature 170-200℃, pressure 0.3-0.5MPa, and sealing time 1.5-3.5s. This process ensures that the two layers of materials are firmly bonded while retaining the air permeability channels between the nonwoven fabric and the PP film.

[0020] The main inventive point of this utility model lies in the first-ever technical solution that uses a hot-pressing device to disperse dot-like pressing of SMMS non-woven fabric and PP film, and then hot-presses and seals this composite film with a PP easy-peel film to form an environmentally friendly, steam-sterilizable medical packaging bag. This solution simultaneously meets the multiple performance requirements of medical steam-sterilizable packaging. According to this utility model, the upper sheet of PP easy-peel film and the lower sheet of PP film are hot-pressed and sealed to form a packaging bag with three closed edges and one open edge. The open edge is the bag mouth, and the opposite side is a V-shaped sealed area that forms the bag bottom. The unsealed edge of the bag bottom serves as the opening for peeling off the packaged items before use. This medical packaging bag is not only steam-sterilizable but also breathable and antibacterial, allowing for easy peeling. Most importantly, all materials are made of recyclable polypropylene, making it environmentally friendly and recyclable.

[0021] The environmentally friendly, steam-sterilizable medical packaging bag provided by this utility model has the following significant advantages over the prior art:

[0022] 1) Steam sterilization resistance: Both SMMS nonwoven fabric and PP film have excellent high temperature resistance (melting point ≥165℃), can withstand steam sterilization (134℃, 30 minutes), have good air permeability, high sealing peel force, strong load-bearing capacity of packaging bags, and are not prone to bag bursting during steam sterilization.

[0023] 2) Breathable and antibacterial: The laser micropores of the PP film allow steam to pass through, while the dense structure of the SMMS nonwoven fabric provides good microbial barrier performance. Together, they achieve a balance of "breathable but antibacterial".

[0024] 3) Clean peeling: The sealing interface between the B-side PP easy-peel film and the A-side PP film is free of debris and fiber shedding during peeling. The peeling force is controlled at 2.0-7.0N / 15mm, which meets the requirements for clean peeling in medical applications.

[0025] 4) Environmentally friendly and recyclable: All materials are polypropylene-based recyclable materials, free of halogens and heavy metals, which is in line with the green development trend of medical packaging.

[0026] In summary, this utility model provides a medical packaging bag that is resistant to steam sterilization, breathable and antibacterial, easy to peel off, and environmentally friendly and recyclable. Attached Figure Description

[0027] Figure 1 is a plan view of a medical packaging bag according to a preferred embodiment of the present invention;

[0028] Figure 2 shows... Figure 1 A cross-sectional view of the medical packaging bag shown;

[0029] Figure 3 is a schematic diagram of the lower sheet structure;

[0030] The meanings of the reference numerals in the attached figures are as follows:

[0031] 10: Upper sheet (PP easy-peel film); 20: Lower sheet; 21: SMMS non-woven fabric; 22: PP film; 23: Heat press point; 24: Micropores; 30: Side heat seal connection; 40: Bag opening; 50: Bag bottom heat seal connection; 60: Opening seal. Detailed Implementation

[0032] The present invention will be further described below with reference to specific embodiments. It should be understood that the following embodiments are for illustrative purposes only and not for limiting the scope of the present invention. Unless otherwise specified, the technical means used in the embodiments are conventional operations in the art, or experimental methods recommended by the instrument and equipment manufacturer. Unless otherwise specified, the reagents and materials used in the embodiments are commercially available.

[0033] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0034] Example 1

[0035] Material preparation

[0036] The upper sheet 10 is made of PP easy-peel film with a thickness of 70μm and a surface tension of 35mN / m. Its trade name is "Polypropylene (PP) Easy-peel Film", which was purchased from Fujian Kailong Packaging Co., Ltd.

[0037] The lower sheet 20 is made of SMMS (spunbond-meltblown-meltblown-spunbond) nonwoven fabric 21 (35g / m²) and PP film 22 (30μm thick). The PP film 22 is commercially known as "polypropylene (PP) film" and was purchased from Fujian Kailong Packaging Co., Ltd.

[0038] A number of uniformly distributed micropores 24 with a pore diameter of 80 μm, a pore spacing of 5 mm, and a density of 6 pores / cm² are pre-processed on the PP film 22 using a laser machine. Then, SMMS nonwoven fabric 21 is stacked together with the PP film 22, and dispersed dot-shaped heat pressing is performed using a hot pressing device to form a number of dispersed heat pressing points 23. The diameter of the heat pressing points 23 is 2 mm, the spacing between the heat pressing points is 25 mm, the heat pressing temperature is 185℃, the pressure is 0.4 MPa, and the heat pressing time is 2.5 s.

[0039] Packaging bag preparation

[0040] The upper sheet (PP easy-peel film) 10 and the lower sheet 20's PP film 22 (SMMS non-woven fabric 21 facing out) are heat-sealed on three sides by a heat-sealing machine to form a side sealing connection 30 and a bottom sealing connection 50. The heat-sealing process conditions are: temperature 195℃, pressure 0.4MPa, time 2.5s, sealing width 10mm, leaving one side unsealed as the bag opening 40. The part opposite to the bag opening 40 is a V-shaped bag bottom. The edge of the bag bottom is left open and unsealed as the opening 60, so that the packaged items can be peeled off after sterilization.

[0041] After the items are filled, the bag opening 40 is then sealed by heat pressing at a temperature of 195℃, a pressure of 0.4MPa, a time of 3s, and a sealing edge width of 10mm to form a sealed packaging bag.

[0042] Performance testing

[0043] Sterilization resistance: After being sterilized three times with steam at 134℃, the material showed no delamination or damage, and the microporous structure remained intact;

[0044] Breathability: Tested by pressure difference method, breathability ≥500mL / (m²・s) (test pressure 1kPa);

[0045] Antimicrobial resistance: Microbial challenge test showed that the bacterial solution (Bacillus subtilis) could not penetrate the B-side material;

[0046] Clean peeling: peeling force 4.5N / 15mm, no debris residue left at the interface after peeling, in compliance with YY / T 0698.5-2009 standard.

[0047] Example 2 (Optimization of Micropore Parameters)

[0048] Material preparation:

[0049] The PP film 22 of the lower sheet 20 is laser-processed with micropores (pore diameter 300μm, pore spacing 3mm, density 15 pores / cm²), and other parameters are the same as in Example 1.

[0050] Performance testing:

[0051] Air permeability: The air permeability is increased to 850 mL / (m²·s), and the steam penetration efficiency is improved.

[0052] Bacterial resistance: No penetration was achieved in the microbial challenge test.

[0053] Peeling results: Peeling force 5.2N / 15mm, clean peeling with no residue.

[0054] Example 3 (High Breathability Design)

[0055] Material preparation:

[0056] The PP film 22 of the lower sheet 20 has a micropore diameter increased to 500μm, a pore spacing of 2mm, and a density of 25 pores / cm². Other parameters are the same as in Example 1.

[0057] Performance testing:

[0058] Air permeability: The air permeability is increased to 1200mL / (m²·s), significantly improving sterilization efficiency and reducing the risk of bag bursting.

[0059] Antimicrobial activity: The microbial barrier remains effective.

[0060] Peeling results: Peeling force 6.5N / 15mm, did not affect clean peeling.

[0061] Comparative Example 1 (Micropore diameter too small)

[0062] Material preparation:

[0063] The PP film 22 of the lower sheet 20 has a micropore diameter of 50μm, a pore spacing of 5mm, and a density of 6 pores / cm².

[0064] Test results:

[0065] Air permeability: The air permeability is only 180mL / (m²·s), which is insufficient for steam penetration, affecting the sterilization effect and increasing the risk of bag bursting.

[0066] Antibacterial properties: effective, but functional imbalance (insufficient breathability is the main defect).

[0067] Peeling performance: Peeling force 3.5N / 15mm, can peel cleanly.

[0068] Therefore, it can be seen that when the micropore size is too small, although it does not affect clean stripping, the air permeability and antibacterial properties cannot meet the requirements.

[0069] Comparative Example 2 (Micropore diameter too large)

[0070] Material preparation:

[0071] The PP film 22 of the lower sheet 20 has a micropore diameter of 600μm, a pore spacing of 2mm, and a density of 30 pores / cm².

[0072] Test results:

[0073] Breathability: Breathability exceeds 1500mL / (m²·s), with excellent breathability.

[0074] Antibacterial properties: Effective.

[0075] Peeling condition: Peeling force 8.0 N / 15mm, fibers appear during peeling, affecting clean peeling.

[0076] Therefore, it can be seen that when the pore size is too large, it may affect the cleanliness of the peeling process.

[0077] Example 4 (Low-temperature heat sealing process)

[0078] Material preparation:

[0079] The sealing temperature of the upper sheet 10 and the lower sheet 20 is set to 170℃, the pressure to 0.3MPa, and the time to 4s.

[0080] Performance testing:

[0081] Peeling performance: Peeling force 2.0N / 15mm, peeling is smooth but there is a risk of bag bursting.

[0082] Sealing performance: Passes the burst pressure test (≥40kPa), meeting medical requirements.

[0083] Comparative Example 3 (Excessive High-Temperature Heat Sealing)

[0084] Test results:

[0085] The sealing temperature of the upper sheet 10 and the lower sheet 20 is set to 230℃, the pressure to 0.5MPa, and the time to 4s.

[0086] Performance testing:

[0087] Peeling condition: Peeling force 10.0N / 15mm, the PP film tears and produces debris during peeling, making clean peeling impossible.

[0088] Sealing performance: The PP molecular chains at the sealing edge are prone to breakage, resulting in decreased sterilization resistance.

[0089] Therefore, it can be seen that a sealing temperature higher than 230℃ may cause the edge to break and fail to seal.

[0090] Example 5 (High-density dot-matrix pressing)

[0091] Sheet composite process:

[0092] The spacing between the pressing points is set to 15mm (for greater density), and the rest is the same as in Example 1.

[0093] Performance testing:

[0094] Bonding strength: The peel strength between SMMS nonwoven fabric and PP film reaches 8N / 15mm, making the composite structure more stable.

[0095] Breathability: 550mL / (m²·s) (The heat-pressing point slightly affects the breathability, but it still meets the standard).

[0096] Comparative Example 4 (the spacing between dots on the iron is too large)

[0097] Sheet composite process:

[0098] The spacing between the pressing points is set to 40mm (too sparse).

[0099] Test results:

[0100] Layer separation: The non-woven fabric and PP film are prone to separating at the bag opening, which is not convenient for sealing instruments and items.

[0101] Based on the above embodiments, the preferred ranges and conclusions of the key experimental parameters of this utility model are shown in Table 1 below:

[0102] Table 1 Parameter Range Verification Conclusion

[0103] parameter Preferred range Defects beyond the scope micropore size 100-500μm <100μm: Insufficient air permeability; >500μm: Mechanical weakening, affecting clean peeling. micropore density <![CDATA[6 - 25 per cm 2 > <6 particles / cm² indicates insufficient air permeability; >25 particles / cm² increases processing costs. Sealing temperature of upper and lower sheets 170-220℃ At temperatures below 170℃, the seal is not secure; at temperatures above 220℃, the peeling force exceeds the standard, making clean peeling impossible and damaging the material structure. Dotted pressing spacing 15-35mm <15mm air passage blockage; >35mm interlayer separation, inconvenient for sealing. Peeling force 2.0-7.0N / 15mm <2.0N / 15mm bag bursting risk, leading to sterilization failure; >7.0N / 15mm clean peeling failure, causing secondary contamination.

[0104] As can be seen from the above embodiments and comparative examples, the parameter range of this utility model has achieved a non-linear balance between air permeability, antibacterial properties, peel strength, and environmental friendliness through extensive experimental screening.

[0105] Micropore design: The size of the laser micropores needs to be appropriate. If the pores are too small, the air permeability will be insufficient, affecting the sterilization effect and the risk of bag bursting. If the pores are too large, the mechanical strength will be sacrificed and the clean peeling after sealing will be affected.

[0106] Heat sealing process window: The glass transition temperature (~0℃) and melting point (~165℃) of PP material limit the lower and upper limits of the heat sealing temperature, which need to be precisely controlled to achieve interfacial bonding rather than melting;

[0107] Environmental compatibility: The recyclability of the entire PP system depends on the matching of the melt flow index of each layer of material. Introducing PE or PET will lead to sorting difficulties, while the comparative model shows that only PP can achieve closed-loop recycling.

[0108] The above data proves that only within the parameter range defined by this utility model can the stringent requirements of medical sterilization packaging be met simultaneously. The synergistic effect between the parameters constitutes the creative contribution of this utility model that distinguishes it from the prior art.

[0109] In summary, the environmentally friendly, steam-sterilizable medical packaging bag provided by this utility model has the following advantages:

[0110] Material composite structure: a dot-like composite of SMMS nonwoven fabric B1 and laser microporous PP film B2, which balances antibacterial properties and breathability;

[0111] Easy-peel design: The heat-sealing interface between the A-side material PP easy-peel film and the B2-side PP film of the B-side material enables low-force and clean peeling, solving the problem of pollution when peeling traditional packaging.

[0112] Combining environmental protection and functionality: The all-PP-based material system meets the dual requirements of sterilization resistance and recyclability.

[0113] The above description is merely a preferred embodiment of this utility model and is not intended to limit the scope of this utility model. Various variations can be made to the above embodiments of this utility model. All simple and equivalent changes and modifications made based on the claims and description of this utility model application fall within the protection scope of the claims of this utility model patent. Any aspects not described in detail in this utility model are conventional technical content.

Claims

1. An environmentally friendly, steam-sterilizable medical packaging bag, wherein the medical sterilization packaging bag is formed by heat-sealing an upper sheet and a lower sheet together on three sides, the unsealed portion forming the bag opening, and the portion opposite the bag opening forming the bag bottom, characterized in that, The upper sheet is a PP easy-peel film, and the lower sheet is made of SMMS non-woven fabric and PP film through a dispersed dot hot-pressing process. The PP film faces the inside of the bag and has a number of micropores uniformly distributed on it through laser processing.

2. The medical packaging bag according to claim 1, characterized in that, The SMMS nonwoven fabric and the PP film are combined through a hot pressing process to form several dispersed heat-pressing points. The diameter of the heat-pressing points is 1-2 mm, and the distance between adjacent heat-pressing points is 15-35 mm.

3. The medical packaging bag according to claim 1, characterized in that, The conditions for the dispersed point hot pressing process are: temperature 170-200℃, pressure 0.3-0.5MPa, and sealing time 1.5-3.5s.

4. The medical packaging bag according to claim 1, characterized in that, The pores formed on the PP film by laser processing have a diameter of 100-500μm and a pore spacing of 2-5mm.

5. The medical packaging bag according to claim 1, characterized in that, The density of micropores formed on the PP film by laser processing is 6-25 per cm², which meets the gas exchange requirements during steam sterilization.

6. The medical packaging bag according to claim 1, characterized in that, The conditions for the hot pressing process of the upper sheet and the lower sheet are: temperature 170-220℃, pressure 0.3-0.5MPa, and sealing time 1.5-4s.

7. The medical packaging bag according to claim 1, characterized in that, The peel force between the PP film and the PP easy-peel film is controlled at 2.0-7.0 N / 15 mm, which meets the requirements for medical clean peeling.

8. The medical packaging bag according to claim 1, characterized in that, The thickness of the PP easy-peel film is 60-80μm, and the surface tension is 30-35mN / m.

9. The medical packaging bag according to claim 1, characterized in that, The SMMS nonwoven fabric has a basis weight of 30-40 g / m², and the PP film has a thickness of 25-35 μm.

10. The medical packaging bag according to claim 1, characterized in that, The bottom of the bag has a V-shaped structure.

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