Packing material capable of preventing mistaken eating

Abstract

The utility model belongs to the technical field of packaging materials, and relates to a mistaken eating prevention packaging material which comprises a polyester layer, a blocking layer and a heat sealing layer which are arranged in a stacked mode, a composite coating containing a bitter agent is arranged on the surface of the side, away from the blocking layer, of the polyester layer, and the heat sealing layer is in direct contact with a packaged object. According to the packaging material provided by the utility model, the composite coating containing the bitter agent is arranged on the outer surface of the polyester layer, so that the problem that children eat the packaging material by mistake is effectively solved, and meanwhile, the packaging functionality, portability and cost effectiveness are well considered.

Description

Technical Field

[0001] This utility model belongs to the field of packaging material technology and relates to a packaging material to prevent accidental ingestion. Background Technology

[0002] In recent years, with the improvement of living standards and the change of consumption concepts, the children's food market has shown a rapid growth trend. However, as its market share continues to expand, related food safety issues have gradually attracted widespread attention from society, especially the safety of packaging materials.

[0003] The core functions of children's food packaging include protecting food quality (such as oxygen barrier, moisture barrier, and light barrier), providing convenience (such as easy opening and portability), and ensuring safety (such as non-toxic and pollution-free). Among these functions, safety is particularly important, especially for the special consumer group of children aged 3-6. Children in this age group are in the oral exploration stage, often exploring objects through biting, licking, and other methods. Therefore, improperly designed food packaging can easily be mistaken by children for edible parts, thus posing a risk of accidental ingestion.

[0004] Take cheese sticks as an example. Their packaging is usually brightly colored and soft, easily attracting children's attention. According to relevant studies, children may tear or bite the packaging out of curiosity, or even swallow pieces of the plastic. If ingested, the plastic pieces can cause serious consequences such as choking and damage to the digestive tract.

[0005] To address this issue, industry regulatory bodies have introduced a series of standards and regulations. For example, the EU's EN71-3 standard and the US ASTM F963-17 standard both require that children's product packaging must not contain detachable small parts to reduce the risk of accidental ingestion. In China, standards such as the "National Food Safety Standard for General Safety Requirements of Food Contact Materials and Articles" (GB 4806.1-2016) and the "National Food Safety Standard for the Use of Additives in Food Contact Materials" (GB 9685-2016) also impose strict requirements on the safety of food packaging materials. For example, regarding the use of bittering agents, GB 9685-2016 explicitly stipulates that the migration amount of denaphalonamine must not exceed 0.01 mg / kg.

[0006] However, despite these standards and regulations, existing children's food packaging still has many shortcomings. For example, cheese stick packaging mainly uses multi-layered composite materials. While these materials can protect food quality and provide convenience to some extent, they still have significant deficiencies in terms of accidental ingestion prevention. On the one hand, existing packaging designs mainly rely on passive protection measures such as warning labels or parental supervision, which cannot fundamentally prevent children from accidentally ingesting the food. On the other hand, some solutions that attempt to improve safety by increasing the thickness of packaging materials or embedding rigid structures often sacrifice the functionality of the packaging, such as reducing heat-sealing performance, increasing packaging size or weight, thereby affecting portability and user experience. In addition, these improvements also lead to a significant increase in cost, making large-scale application difficult.

[0007] Therefore, it is evident that providing a packaging material specifically suitable for children's food to prevent accidental ingestion, effectively solving the problem of children accidentally ingesting packaging materials, while also considering the functionality, portability, and cost-effectiveness of the packaging, has become an urgent problem for those skilled in the art. Utility Model Content

[0008] In view of the shortcomings of the existing technology, the purpose of this utility model is to provide a packaging material that prevents accidental ingestion. By setting a composite coating containing a bittering agent on the outer surface of the polyester layer, the problem of children accidentally ingesting the packaging material is effectively solved, while also taking into account the functionality, portability and cost-effectiveness of the packaging.

[0009] To achieve the objective of this utility model, the following technical solution is adopted:

[0010] This utility model provides a packaging material to prevent accidental ingestion. The packaging material includes a polyester layer, a barrier layer and a heat-sealing layer stacked together. The polyester layer has a composite coating containing a bittering agent on the surface away from the barrier layer. The heat-sealing layer is in direct contact with the packaged item.

[0011] The packaging material provided by this utility model has a composite coating containing bittering agent on one side of the polyester layer and a barrier layer on the other side, which prevents the bittering agent from migrating inside the packaging material and keeps it only on the non-contact surface of the packaged item. This effectively solves the problem of children accidentally ingesting the packaging material and avoids the contamination of the packaged item by the bittering agent.

[0012] Preferably, the bittering agent comprises benzyl dinatamine, and the migration amount of the bittering agent within the packaging material is <0.001 mg / kg.

[0013] Preferably, the barrier layer acts as a migration barrier for the bittering agent, with an oxygen permeability of <5 cm⁻¹. 3 / m 2 ·24h·0.1MPa.

[0014] Preferably, the polyester layer is made of polyethylene terephthalate.

[0015] Preferably, the barrier layer is made of polystyrene.

[0016] Preferably, the heat-sealing layer is made of polyethylene and / or polypropylene.

[0017] Preferably, the composite coating formulation comprises, by mass percentage: 0.05%-0.08% benzyl denatum, 85%-90% waterborne polyurethane resin, 1.5%-2% nano silica, 0.8%-1.2% silane coupling agent, and the balance being deionized water.

[0018] Preferably, the glass transition temperature of the waterborne polyurethane resin is -40°C to -20°C.

[0019] Preferably, the average particle size of the nano-silica is 20nm-40nm.

[0020] Preferably, the silane coupling agent is of type KH-560.

[0021] Preferably, the conductivity of the deionized water is ≤5 μS / cm.

[0022] Preferably, the thickness of the polyester layer is 15μm-20μm.

[0023] Preferably, the thickness of the barrier layer is 200μm-250μm.

[0024] Preferably, the thickness of the heat-sealing layer is 40μm-60μm.

[0025] Preferably, the dry film thickness of the composite coating is 0.8 μm-1 μm.

[0026] In this invention, the preparation method of the anti-ingestion packaging material includes: coating a composite coating containing a bittering agent on one side surface of a polyester layer, drying it, and then sequentially bonding a barrier layer and a heat-sealing layer on the other side surface of the polyester layer, followed by curing to obtain the anti-ingestion packaging material.

[0027] Preferably, the coating is performed using a gravure coating machine, and the thickness of the wet film obtained by coating is 12μm-15μm, and the solid content is 25wt%-35wt%.

[0028] Preferably, the drying process uses a three-section oven, and the drying temperature is ≤70℃.

[0029] Preferably, the composite process employs a solvent-free method, comprising: applying adhesive to the composite surfaces of the polyester layer and the heat-sealing layer respectively, and performing a three-in-one composite with the barrier layer.

[0030] Preferably, the aging temperature is 40℃-50℃.

[0031] Preferably, the curing time is 40-50 hours.

[0032] In this invention, the anti-ingestion packaging material is used for packaging children's food.

[0033] Compared with the prior art, the present invention has the following beneficial effects:

[0034] The packaging material provided by this utility model has a composite coating containing bittering agent on one side of the polyester layer and a barrier layer on the other side, which prevents the bittering agent from migrating inside the packaging material and keeps it only on the non-contact surface of the packaged item. This effectively solves the problem of children accidentally ingesting the packaging material and avoids the contamination of the packaged item by the bittering agent. Attached Figure Description

[0035] Figure 1 This is a schematic diagram of the structure of the anti-accidental ingestion packaging material provided by this utility model.

[0036] Wherein: 1-polyester layer; 2-barrier layer; 3-heat seal layer; 4-composite coating. Detailed Implementation

[0037] The technical solution of this utility model will be further described below through specific embodiments. Those skilled in the art should understand that the embodiments described are merely illustrative of this utility model and should not be considered as specific limitations thereof.

[0038] One embodiment of this utility model provides an anti-ingestion packaging material, which includes a polyester layer, a barrier layer and a heat-sealing layer stacked together, wherein the polyester layer has a composite coating containing a bittering agent on the side away from the barrier layer, and the heat-sealing layer is in direct contact with the packaged item.

[0039] The packaging material provided by this utility model has a composite coating containing bittering agent on one side of the polyester layer and a barrier layer on the other side, which prevents the bittering agent from migrating inside the packaging material and keeps it only on the non-contact surface of the packaged item. This effectively solves the problem of children accidentally ingesting the packaging material and avoids the contamination of the packaged item by the bittering agent.

[0040] In some embodiments, the bittering agent comprises benzyl denatamine, and the migration amount of the bittering agent within the packaging material is <0.001 mg / kg, for example, it may be 0.0002 mg / kg, 0.0004 mg / kg, 0.0006 mg / kg or 0.0008 mg / kg, but is not limited to the listed values, other unlisted values ​​within this range are also applicable.

[0041] In this invention, the method for detecting the migration of the bittering agent in the packaging material refers to GB 31604.8-2021.

[0042] In some embodiments, the barrier layer acts as a migration barrier for the bittering agent, with an oxygen permeability of <5 cm⁻¹. 3 / m 2 • 24h • 0.1MPa, for example, could be 0.5cm 3 / m 2 ·24h·0.1MPa, 1cm 3 / m 2 ·24h·0.1MPa, 1.5cm 3 / m 2 ·24h·0.1MPa, 2cm 3 / m 2 ·24h·0.1MPa, 2.5cm 3 / m 2 ·24h·0.1MPa, 3cm 3 / m 2 ·24h·0.1MPa, 3.5cm 3 / m 2 ·24h·0.1MPa, 4cm 3 / m 2 ·24h·0.1MPa or 4.5cm 3 / m 2 •24h•0.1MPa, but not limited to the listed values; other unlisted values ​​within this range also apply.

[0043] In some embodiments, the polyester layer is made of polyethylene terephthalate (PET).

[0044] In some embodiments, the barrier layer is made of polystyrene (PS).

[0045] In some embodiments, the heat-sealing layer is made of polyethylene (PE) and / or polypropylene (PP).

[0046] In some embodiments, the composite coating formulation comprises, by weight percentage: 0.05%-0.08% benzyl denatum, 85%-90% waterborne polyurethane resin, 1.5%-2% nano silica, 0.8%-1.2% silane coupling agent, and the balance being deionized water.

[0047] This invention uses water-based polyurethane resin as the film-forming matrix, effectively avoiding the erosion of the barrier layer by traditional solvents (such as ethanol and acetone), with a peel strength ≥3.5N / 15mm (test method refers to GB / T 8808). Simultaneously, the nano-silica acts as a migration inhibitor, further blocking the migration of bittering agents within the packaging material; the silane coupling agent, rich in Si-OC bonds, significantly improves the adhesion of the composite coating to the polyester layer surface.

[0048] The content of the benzyl denatamine is 0.05%-0.08%, for example, it can be 0.05%, 0.06%, 0.07% or 0.08%; the content of the waterborne polyurethane resin is 85%-90%, for example, it can be 85%, 86%, 87%, 88%, 89% or 90%; the content of the nano silica is 1.5%-2%, for example, it can be 1.5%, 1.6%, 1.7%, 1.8%, 1.9% or 2%; and the content of the silane coupling agent is 0.8%-1.2%, for example, it can be 0.8%, 0.9%, 1%, 1.1% or 1.2%, but it is not limited to the listed values. Other unlisted values ​​within this range are also applicable.

[0049] In some embodiments, the glass transition temperature of the waterborne polyurethane resin is -40°C to -20°C, for example, it may be -40°C, -35°C, -30°C, -25°C or -20°C, but is not limited to the listed values. Other unlisted values ​​within this range are also applicable.

[0050] In some embodiments, the average particle size of the nano-silica is 20nm-40nm, for example, it can be 20nm, 22nm, 24nm, 26nm, 28nm, 30nm, 32nm, 34nm, 36nm, 38nm or 40nm, but is not limited to the listed values, and other unlisted values ​​within this range are also applicable.

[0051] In some embodiments, the silane coupling agent includes the type KH-560.

[0052] In some embodiments, the conductivity of the deionized water is ≤5 μS / cm, for example, it can be 1 μS / cm, 1.5 μS / cm, 2 μS / cm, 2.5 μS / cm, 3 μS / cm, 3.5 μS / cm, 4 μS / cm, 4.5 μS / cm or 5 μS / cm, but is not limited to the listed values, other unlisted values ​​within this range are also applicable.

[0053] In some embodiments, the thickness of the polyester layer is 15μm-20μm, for example, it can be 15μm, 15.5μm, 16μm, 16.5μm, 17μm, 17.5μm, 18μm, 18.5μm, 19μm, 19.5μm or 20μm, but is not limited to the listed values, other unlisted values ​​within this range are also applicable.

[0054] In some embodiments, the thickness of the barrier layer is 200μm-250μm, for example, it can be 200μm, 205μm, 210μm, 215μm, 220μm, 225μm, 230μm, 235μm, 240μm, 245μm or 250μm, but is not limited to the listed values, other unlisted values ​​within this range are also applicable.

[0055] In some embodiments, the thickness of the heat-sealing layer is 40μm-60μm, for example, it can be 40μm, 42μm, 44μm, 46μm, 48μm, 50μm, 52μm, 54μm, 56μm, 58μm or 60μm, but is not limited to the listed values, other unlisted values ​​within this range are also applicable.

[0056] In some embodiments, the dry film thickness of the composite coating is 0.8 μm-1 μm, for example, it can be 0.8 μm, 0.82 μm, 0.84 μm, 0.86 μm, 0.88 μm, 0.9 μm, 0.92 μm, 0.94 μm, 0.96 μm, 0.98 μm or 1 μm, but is not limited to the listed values, other unlisted values ​​within this range are also applicable.

[0057] One embodiment of this utility model also provides a method for preparing the anti-ingestion packaging material described in any of the above embodiments. The preparation method includes: coating a composite coating containing a bittering agent on one side surface of a polyester layer, drying it, and then sequentially bonding a barrier layer and a heat-sealing layer to the other side surface of the polyester layer, and obtaining the anti-ingestion packaging material after curing.

[0058] In this invention, the polyester layer is subjected to corona treatment on the surface to be coated before the composite coating is applied, so that the dyne value is ≥42mN / m. This ensures that the composite coating is uniformly coated and firmly adhered to the surface of the polyester layer. This not only helps the coating to remain stable during subsequent processing and use, but also prevents the coating from falling off or peeling off, thereby ensuring the long-term effectiveness of the anti-ingestion function.

[0059] In some embodiments, the coating is performed using a gravure coating machine, and the thickness of the wet film obtained by coating is 12μm-15μm, for example, it can be 12μm, 12.5μm, 13μm, 13.5μm, 14μm, 14.5μm or 15μm, and the solid content is 25wt%-35wt%, for example, it can be 25wt%, 26wt%, 27wt%, 28wt%, 29wt%, 30wt%, 31wt%, 32wt%, 33wt%, 34wt% or 35wt%, but is not limited to the listed values, other unlisted values ​​within this range are also applicable.

[0060] In some embodiments, the drying is performed using a three-section oven, and the drying temperature is ≤70°C, for example, it can be 30°C, 35°C, 40°C, 45°C, 50°C, 55°C, 60°C, 65°C or 70°C, but is not limited to the listed values, other unlisted values ​​within this range are also applicable.

[0061] This invention limits the drying temperature to below 70°C, that is, the low-temperature coating process significantly reduces the thermal decomposition rate of bittering agents (thermal decomposition rate of benzodiazepine <5%), effectively solving the contradiction between bittering agent activity and processing temperature, and well preserving the activity of bittering agents.

[0062] In some embodiments, the composite process employs a solvent-free method, including: applying adhesive to the composite surfaces of the polyester layer and the heat-sealable layer respectively, and performing a three-in-one composite with the barrier layer.

[0063] This invention uses a solvent-free process to composite the packaging materials of each layer, is compatible with existing production processes, requires no modification to the production line, and increases costs by less than 3%, which is conducive to large-scale application.

[0064] In some embodiments, the curing temperature is 40°C-50°C, for example, it can be 40°C, 41°C, 42°C, 43°C, 44°C, 45°C, 46°C, 47°C, 48°C, 49°C or 50°C, but is not limited to the listed values, other unlisted values ​​within this range are also applicable.

[0065] In some embodiments, the curing time is 40h-50h, for example, it can be 40h, 41h, 42h, 43h, 44h, 45h, 46h, 47h, 48h, 49h or 50h, but is not limited to the listed values, other unlisted values ​​within this range are also applicable.

[0066] One embodiment of this utility model also provides an application of the anti-ingestion packaging material described in any of the above embodiments, wherein the anti-ingestion packaging material is used for packaging children's food.

[0067] The numerical range described in this utility model includes not only the point values ​​listed above, but also any point values ​​within the above numerical range that are not listed. Due to space limitations and for the sake of brevity, this utility model will not exhaustively list the specific point values ​​included in the range.

[0068] Example 1

[0069] This embodiment provides a packaging material to prevent accidental ingestion and its preparation method, such as... Figure 1 As shown, the anti-ingestion packaging material includes a polyester layer 1, a barrier layer 2, and a heat-sealing layer 3 stacked together. The polyester layer 1 has a composite coating 4 containing a bittering agent on the side away from the barrier layer 2. The heat-sealing layer 3 is in direct contact with the packaged item.

[0070] In this embodiment, the polyester layer 1 is made of PET and has a thickness of 17 μm; the barrier layer 2 is made of PS and has a thickness of 230 μm; and the heat-sealing layer 3 is made of PE and has a thickness of 50 μm. The bittering agent is denaphalonamine. The barrier layer 2 acts as a migration barrier for the bittering agent, with an oxygen permeability of <5 cm³ / m²·24h·0.1 MPa, a milky white color, and a light-blocking rate ≥90% (ASTM D1003). The heat-sealing strength of the heat-sealing layer 3 is ≥25 N / 15 mm (GB / T23508).

[0071] Specifically, by mass percentage, the formulation of the composite coating 4 comprises: 0.06% benzyl denatum, 88% waterborne polyurethane resin, 1.8% nano-silica, 1% silane coupling agent KH-560, and the balance being deionized water. The waterborne polyurethane resin has a glass transition temperature of -30℃, the nano-silica has an average particle size of 30nm, the deionized water has a conductivity ≤5μS / cm, and the dry film thickness of the composite coating 4 is 0.9μm.

[0072] The preparation method of the above-mentioned anti-ingestion packaging material includes the following steps:

[0073] (1) One side surface of the polyester layer 1 is corona treated to make the dyne value ≥42mN / m. Then, a composite coating 4 containing bittering agent is coated on the corona-treated surface of the polyester layer 1 using a gravure coating machine. The gravure coating machine has an anilox roller of 180 lines / inch and a volume of 3.2cm3 / m2. The thickness of the wet film obtained by coating is 14μm and the solid content is 30wt%.

[0074] (2) The coated polyester layer 1 is transferred to a three-stage drying oven for drying. The drying temperature of the first stage is 60℃ and the drying time is 8s; the drying temperature of the second stage is 70℃ and the drying time is 6s; the drying temperature of the third stage is 55℃ and the drying time is 5s.

[0075] (3) The dried polyester layer 1 is unwound, with the tension controlled at 150N±5%. Adhesive is applied to the surface of the side without the composite coating 4, and adhesive is also applied to the surface of the heat-sealing layer 3. The three-in-one composite is then formed with the barrier layer 2. After being composited using a solvent-free process, the composite layer is cured at 45°C for 48 hours to ensure complete curing, thus obtaining the anti-ingestion packaging material.

[0076] Example 2

[0077] This embodiment provides a packaging material to prevent accidental ingestion and its preparation method, such as... Figure 1 As shown, the anti-ingestion packaging material includes a polyester layer 1, a barrier layer 2, and a heat-sealing layer 3 stacked together. The polyester layer 1 has a composite coating 4 containing a bittering agent on the side away from the barrier layer 2. The heat-sealing layer 3 is in direct contact with the packaged item.

[0078] In this embodiment, the polyester layer 1 is made of PET and has a thickness of 15 μm; the barrier layer 2 is made of PS and has a thickness of 200 μm; and the heat-sealing layer 3 is made of PE and has a thickness of 40 μm. The bittering agent is denaphalonamine. The barrier layer 2 acts as a migration barrier for the bittering agent, with an oxygen permeability of <5 cm³ / m²·24h·0.1 MPa, a milky white color, and a light-blocking rate ≥90% (ASTM D1003). The heat-sealing strength of the heat-sealing layer 3 is ≥25 N / 15 mm (GB / T23508).

[0079] Specifically, by mass percentage, the formulation of the composite coating 4 includes: 0.05% benzyl denatum, 85% waterborne polyurethane resin, 1.5% nano-silica, 0.8% silane coupling agent KH-560, and the balance being deionized water. The waterborne polyurethane resin has a glass transition temperature of -40℃, the nano-silica has an average particle size of 20nm, the deionized water has a conductivity ≤5μS / cm, and the dry film thickness of the composite coating 4 is 0.8μm.

[0080] The preparation method of the above-mentioned anti-ingestion packaging material includes the following steps:

[0081] (1) One side of the polyester layer 1 is corona treated to achieve a dyne value ≥ 42 mN / m. Then, a composite coating 4 containing a bittering agent is applied to the corona-treated surface of the polyester layer 1 using a gravure coating machine. The gravure coating machine uses an anilox roller with a speed of 180 lines / inch and a volume of 3.2 cm³. 3 / m 2 The thickness of the wet film obtained by coating is 12 μm, and the solid content is 25 wt%.

[0082] (2) The coated polyester layer 1 is transferred to a three-stage drying oven for drying. The drying temperature of the first stage is 60℃ and the drying time is 8s; the drying temperature of the second stage is 70℃ and the drying time is 6s; the drying temperature of the third stage is 55℃ and the drying time is 5s.

[0083] (3) The dried polyester layer 1 is unwound, with the tension controlled at 150N±5%. Adhesive is applied to the surface of the side without the composite coating 4, and adhesive is also applied to the surface of the heat-sealing layer 3. The three-in-one composite is then formed with the barrier layer 2. After being composited using a solvent-free process, the composite layer is cured at 40°C for 50 hours to ensure complete curing, thus obtaining the anti-ingestion packaging material.

[0084] Example 3

[0085] This embodiment provides a packaging material to prevent accidental ingestion and its preparation method, such as... Figure 1 As shown, the anti-ingestion packaging material includes a polyester layer 1, a barrier layer 2, and a heat-sealing layer 3 stacked together. The polyester layer 1 has a composite coating 4 containing a bittering agent on the side away from the barrier layer 2. The heat-sealing layer 3 is in direct contact with the packaged item.

[0086] In this embodiment, the polyester layer 1 is made of PET and has a thickness of 20 μm; the barrier layer 2 is made of PS and has a thickness of 250 μm; and the heat-sealing layer 3 is made of PE and has a thickness of 60 μm. The bittering agent is denaphalonamine. The barrier layer 2 acts as a migration barrier for the bittering agent, with an oxygen permeability of <5 cm³ / m²·24h·0.1 MPa, a milky white color, and a light-blocking rate ≥90% (ASTM D1003). The heat-sealing strength of the heat-sealing layer 3 is ≥25 N / 15 mm (GB / T23508).

[0087] Specifically, by mass percentage, the formulation of the composite coating 4 includes: 0.08% benzyl denatum, 90% waterborne polyurethane resin, 2% nano-silica, 1.2% silane coupling agent KH-560, and the balance being deionized water. The waterborne polyurethane resin has a glass transition temperature of -20℃, the nano-silica has an average particle size of 40nm, the deionized water has a conductivity ≤5μS / cm, and the dry film thickness of the composite coating 4 is 1μm.

[0088] The preparation method of the above-mentioned anti-ingestion packaging material includes the following steps:

[0089] (1) One side surface of the polyester layer 1 is corona treated to make the dyne value ≥42mN / m. Then, a composite coating 4 containing bittering agent is coated on the corona-treated surface of the polyester layer 1 using a gravure coating machine. The gravure coating machine has an anilox roller of 180 lines / inch and a volume of 3.2cm3 / m2. The thickness of the wet film obtained by coating is 15μm and the solid content is 35wt%.

[0090] (2) The coated polyester layer 1 is transferred to a three-stage drying oven for drying. The drying temperature of the first stage is 60℃ and the drying time is 8s; the drying temperature of the second stage is 70℃ and the drying time is 6s; the drying temperature of the third stage is 55℃ and the drying time is 5s.

[0091] (3) The dried polyester layer 1 is unwound, with the tension controlled at 150N±5%. Adhesive is applied to the surface of the side without the composite coating 4, and adhesive is also applied to the surface of the heat-sealing layer 3. The three-in-one composite is then formed with the barrier layer 2. After being composited using a solvent-free process, the composite layer is cured at 50°C for 40 hours to ensure complete curing, thus obtaining the anti-ingestion packaging material.

[0092] Example 4

[0093] This embodiment provides a packaging material to prevent accidental ingestion and its preparation method. Except for changing the material of the heat-sealing layer 3 to PP, the rest of the structure and conditions are the same as in Embodiment 1, so they will not be described in detail here.

[0094] Example 5

[0095] This embodiment provides a packaging material to prevent accidental ingestion and its preparation method. Except for changing the dry film thickness of the composite coating 4 to 0.6 μm, the other structures and conditions are the same as in Example 1, so they will not be described in detail here.

[0096] Example 6

[0097] This embodiment provides a packaging material to prevent accidental ingestion and its preparation method. Except for changing the dry film thickness of the composite coating 4 to 1.5 μm, the other structures and conditions are the same as in Example 1, so they will not be described in detail here.

[0098] Comparative Example 1

[0099] This comparative example provides a packaging material to prevent accidental ingestion and its preparation method. Except for removing the barrier layer 2, that is, directly bonding the polyester layer 1 and the heat-sealing layer 3 together, the rest of the structure and conditions are the same as in Example 1, so they will not be described in detail here.

[0100] Comparative Example 2

[0101] This comparative example provides a packaging material to prevent accidental ingestion and its preparation method. Except for transferring the coated polyester layer 1 to a regular oven for one-stage drying, and changing the drying temperature to 80°C and the drying time to 20s, i.e., using a high-temperature coating process, the other steps and conditions are the same as in Example 1, so they will not be described in detail here.

[0102] Performance testing

[0103] Referring to the "National Food Safety Standard for Determination of Total Migration in Food Contact Materials and Articles" (GB 31604.8-2021), the migration of bittering agents in the anti-accidental ingestion packaging materials obtained in Examples 1-6 and Comparative Examples 1-2 was tested. The relevant test results are shown in Table 1 below.

[0104] Table 1

[0105] Anti-ingestion packaging materials Migration of bittering agents Example 1 ≤0.001mg / kg Example 2 <0.001mg / kg Example 3 <0.001mg / kg Example 4 <0.001mg / kg Example 5 <0.001mg / kg Example 6 <0.002mg / kg Comparative Example 1 >0.01mg / kg Comparative Example 2 <0.001mg / kg

[0106] As shown in Table 1, the migration amount of bitter agents in the anti-ingestion packaging materials obtained in Examples 1-5 is all below 0.001 mg / kg. However, due to the thin composite coating in Example 5, the anti-ingestion effect is slightly reduced, while the thick composite coating in Example 6 leads to a slight increase in the migration amount of bitter agents. Comparative Example 1 directly removed the barrier layer, resulting in a sharp increase in the migration amount of bitter agents to above 0.01 mg / kg, which does not meet the safety requirements. Although Comparative Example 2 meets the requirements for the migration amount of bitter agents, the high-temperature coating process leads to a higher thermal decomposition rate of the bitter agents, and the activity is significantly lower than that of Example 1.

[0107] Therefore, the packaging material provided by this utility model has a composite coating containing bittering agent on one side of the polyester layer and a barrier layer on the other side, which prevents the bittering agent from migrating inside the packaging material and keeps it only on the non-contact surface of the packaged item. This effectively solves the problem of children accidentally ingesting the packaging material and avoids the contamination of the packaged item by the bittering agent.

[0108] Furthermore, the preparation method provided by this utility model uses a low-temperature coating process (drying temperature ≤70℃) to coat a composite coating containing bittering agents, which significantly reduces the thermal decomposition rate of bittering agents, preserves the activity of bittering agents, and is compatible with solvent-free composite packaging materials. It is compatible with existing production processes, requires no modification to the production line, and is conducive to large-scale application, effectively balancing the functionality, portability, and cost-effectiveness of the packaging.

[0109] The above description is only a specific embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Those skilled in the art should understand that any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present utility model fall within the protection and disclosure scope of the present utility model.

Claims

1. A packaging material to prevent accidental ingestion, characterized in that, The anti-ingestion packaging material includes a polyester layer, a barrier layer, and a heat-sealing layer stacked together. The polyester layer has a composite coating containing a bittering agent on the surface away from the barrier layer. The heat-sealing layer is in direct contact with the packaged item.

2. The anti-ingestion packaging material according to claim 1, characterized in that, The bittering agent includes benzyl dinatamine, and the migration amount of the bittering agent within the packaging material is <0.001 mg / kg.

3. The anti-ingestion packaging material according to claim 1, characterized in that, The barrier layer acts as a migration barrier for the bittering agent, with an oxygen permeability of <5cm. 3 / m 2 ·24h·0.1MPa.

4. The anti-ingestion packaging material according to claim 1, characterized in that, The thickness of the polyester layer is 15μm-20μm.

5. The anti-ingestion packaging material according to claim 1, characterized in that, The thickness of the barrier layer is 200μm-250μm.

6. The anti-ingestion packaging material according to claim 1, characterized in that, The thickness of the heat-sealing layer is 40μm-60μm.

7. The anti-ingestion packaging material according to claim 1, characterized in that, The dry film thickness of the composite coating is 0.8μm-1μm.

Images