Thermal insulation package

Abstract

The utility model discloses a kind of heat preservation and thermal insulation packaging, including a bag body, bag body has a multi-layer structure, the multi-layer structure at least includes an outer layer support film layer, a barrier layer being arranged in the inner side of outer layer support film layer and an inner layer heat seal layer being arranged in the inner side of barrier layer, barrier layer and inner layer heat seal layer between being provided with a non-woven fabric layer.The utility model sets up non-woven fabric layer between barrier layer and inner layer heat seal layer, effectively solve the problem that the heat preservation and thermal insulation performance of packaging bag is limited and use experience is poor.Non-woven fabric layer forms a high-efficiency thermal resistance barrier in packaging bag structure by the air retained in its porous structure as the poor conductor of heat and the low thermal conductivity characteristics of fiber.

Description

Technical Field

[0001] This utility model relates to the field of liquid packaging bag technology, and in particular to a heat-insulating packaging. Background Technology

[0002] Traditional liquid packaging bags, such as the common "PET (Polyethylene terephthalate) / metallized PET / PE (Polyethylene)" or "PET / aluminum foil / PE" structures, primarily rely on the PET layer for mechanical support, the aluminum foil or metallized layer for light shielding and barrier properties, and the PE layer for heat sealing. In practical applications, especially when thermal insulation of the contents is required, this type of structure presents the following main technical challenges:

[0003] 1. Limited thermal insulation performance: In traditional packaging bag structures, although aluminum foil or aluminized layers have a certain reflective effect on heat radiation, their own thermal conductivity is relatively high, and they mainly rely on their reflective properties to achieve limited thermal insulation. When there is a large temperature difference between the environment and the contents, this structure is difficult to effectively slow down the transfer (loss or intrusion) of heat, resulting in poor thermal insulation or cold insulation performance.

[0004] 2. Poor user experience: Due to the high thermal conductivity of aluminum (aluminum foil or aluminum in the aluminized layer), when the packaging bag contains high-temperature or low-temperature liquids, heat will be rapidly conducted through the packaging bag to the outer surface. This makes it easy for consumers to feel hot or cold when holding the packaging bag due to the excessively hot or cold outer surface, seriously affecting the comfort and convenience of use.

[0005] Therefore, existing liquid packaging bags need improvement in terms of thermal insulation performance and user grip experience. The market urgently needs a liquid packaging solution that can provide better insulation and improve user experience. Utility Model Content

[0006] The main purpose of this utility model is to provide a heat-insulating packaging to solve the above-mentioned technical problems.

[0007] The objective of this utility model can be achieved by adopting the following technical solution:

[0008] A heat-insulating packaging includes a bag body having a multi-layer structure, the multi-layer structure including at least an outer support film layer, a barrier layer disposed inside the outer support film layer, and an inner heat-sealing layer disposed inside the barrier layer, with a non-woven fabric layer disposed between the barrier layer and the inner heat-sealing layer.

[0009] The outer supporting film is a polyethylene terephthalate film.

[0010] The barrier layer is an aluminized polyethylene terephthalate film.

[0011] The aluminum coating thickness of the aluminized polyethylene terephthalate film is 30-50 nanometers.

[0012] The basis weight of the nonwoven fabric layer is 15-60 g / m².

[0013] The inner heat-sealing layer is a low-temperature heat-sealing polyethylene film, and the self-sealing temperature range of the low-temperature heat-sealing polyethylene film is 80-120℃.

[0014] The barrier layer and the nonwoven fabric layer are further provided with a first coating layer, and the nonwoven fabric layer and the inner heat-sealing layer are further provided with a second coating layer.

[0015] An adhesive layer is also provided between the barrier layer and the first coating layer.

[0016] The heat-insulating packaging also includes a bag bottom, which comprises, from the outside to the inside, a polyethylene terephthalate film, an aluminized polyethylene terephthalate film, and a heat-sealable polyethylene film.

[0017] The heat-insulating packaging also includes a spout and a threaded cap.

[0018] The beneficial technical effects of this utility model are as follows:

[0019] This invention effectively solves the problems of limited thermal insulation performance and poor user experience of packaging bags by setting a non-woven fabric layer between the barrier layer and the inner heat-sealing layer. The non-woven fabric layer, with its porous structure trapping air as a poor conductor of heat and the low thermal conductivity of the fibers themselves, forms a highly efficient thermal barrier within the packaging bag structure. This structure achieves a dual technical effect: on the one hand, the non-woven fabric layer significantly slows down the rate of heat conduction, working synergistically with the heat radiation reflection function of the barrier layer to improve the overall thermal insulation performance of the packaging bag and effectively delay temperature changes of the contents; on the other hand, the non-woven fabric layer acts as a "thermal buffer," effectively blocking the rapid transfer of the contents' temperature (whether high or low) to the outer surface of the packaging bag, making the outer surface temperature more moderate when the consumer holds it, avoiding the discomfort of burning or freezing hands, thus fundamentally improving the user experience. Attached Figure Description

[0020] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 A schematic cross-sectional view of the bag body in the thermal insulation packaging provided for an embodiment of this utility model;

[0022] Figure 2 A schematic diagram of the overall thermal insulation packaging provided for an embodiment of this utility model;

[0023] Figure 3 A schematic cross-sectional view of the bottom of the thermal insulation packaging bag provided for an embodiment of this utility model.

[0024] Explanation of reference numerals in the attached figures:

[0025] In the diagram: 10-bag body, 20-outer support film layer, 30-barrier layer, 40-inner heat-sealing layer, 50-non-woven fabric layer, 61-first coating layer, 62-second coating layer, 70-adhesive layer, 80-bag bottom, 81-polyethylene terephthalate film, 82-aluminized polyethylene terephthalate film, 83-heat-sealed polyethylene film, 91-clip, 92-threaded bottle cap. Detailed Implementation

[0026] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.

[0027] It should be understood that, when used in this specification and the appended claims, the terms "comprising" and "including" indicate the presence of the described features, integrals, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components and / or collections thereof.

[0028] It should also be understood that the terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to limit the scope of the invention. As used in this specification and the appended claims, the singular forms “a,” “an,” and “the” are intended to include the plural forms unless the context clearly indicates otherwise.

[0029] It should also be further understood that the term "and / or" as used in this specification and the appended claims refers to any combination of one or more of the associated listed items and all possible combinations, and includes such combinations.

[0030] like Figures 1-3As shown in the figure, this utility model provides a heat-insulating packaging bag that can be used to contain liquids or semi-fluid substances, such as hot drinks, cold drinks, dairy products, etc. The heat-insulating packaging bag includes a bag body 10, which has a multi-layer structure. The multi-layer structure includes at least an outer support film layer 20, a barrier layer 30 disposed inside the outer support film layer 20, and an inner heat-sealing layer 40 disposed inside the barrier layer 30. A non-woven fabric layer 50 is disposed between the barrier layer 30 and the inner heat-sealing layer 40.

[0031] In this embodiment, the bag body 10 has a multi-layer structure. Specifically, the multi-layer structure, viewed from the outermost layer to the innermost layer, includes:

[0032] Outer support film layer 20: As the outermost layer of the packaging bag, it gives the packaging bag good mechanical strength, stiffness and printability.

[0033] Barrier layer 30: Located inside the outer support film layer 20, this layer is composed of a metallized thin film with good barrier properties, such as an aluminum-plated film or aluminum foil. It is mainly used to block oxygen, water vapor and light, and has a certain reflective ability to thermal radiation.

[0034] Inner heat-sealing layer 40: Located inside the barrier layer 30, and is the innermost or facing layer of the bag body 10 structure. This layer material has good heat-sealing properties and is used to seal the various parts of the packaging bag by heat pressing to form a sealed containment space, and is in direct contact with the contents.

[0035] Between the barrier layer 30 and the inner heat-sealing layer 40, a non-woven fabric layer 50 is specially provided. Non-woven fabric is a sheet, web, or mat made of oriented or randomly arranged fibers bonded together by friction, cohesion, or adhesion. Its structural characteristic is the presence of numerous tiny pores between the fibers. The air trapped in these pores is a poor conductor of heat.

[0036] When heat inside the packaging bag (or cold air from the external environment) attempts to be conducted through the bag body 10, the inner heat-sealing layer 40 transfers the heat to the non-woven fabric layer 50 it contacts. Due to the large number of static air pores in the non-woven fabric layer 50, the heat conduction path through the non-woven fabric layer 50 becomes tortuous and greatly hindered, resulting in a significant reduction in the heat conduction rate.

[0037] Therefore, the nonwoven layer 50 plays an effective role in heat barrier. It works in conjunction with the barrier layer 30 (which can still reflect some heat radiation) to reduce heat transfer (including conduction and radiation), thereby significantly improving the overall heat insulation performance of the packaging bag and more effectively slowing down the temperature change of the contents.

[0038] When the contents are hot (such as hot drinks), heat is transferred out from the inner heat-sealing layer 40. Without the non-woven fabric layer 50, this heat would be quickly transferred to the highly thermally conductive barrier layer 30, and then rapidly transferred to the outermost support film layer, causing the outer surface temperature of the bag body 10 to rise rapidly, making it hot to the touch.

[0039] Because a nonwoven fabric layer 50 is placed between the inner heat-sealing layer 40 and the barrier layer 30, this nonwoven fabric layer 50 acts like a "thermal buffer." After heat is transferred from the inner heat-sealing layer 40 to the nonwoven fabric layer 50, the rate at which heat is transferred to the barrier layer 30 is greatly slowed down due to the low thermal conductivity of the nonwoven fabric.

[0040] This means that the temperature rise rate and the final temperature reached by the barrier layer 30 and the outermost support film layer 20 will be significantly lower than in the case without the nonwoven fabric layer 50. Therefore, when consumers hold the packaging bag, the temperature of the outer surface of the bag body 10 will be more moderate and less likely to feel hot.

[0041] Similarly, when the contents are at a low temperature (such as chilled drinks), the non-woven fabric layer 50 can effectively slow down the transfer of heat from the external environment to the inside and slow down the rapid drop in the temperature of the outer surface of the bag body 10, avoiding the feeling of cold hands, and also playing a positive role in keeping the contents at a low temperature.

[0042] In summary, this embodiment introduces a non-woven fabric layer 50 at a specific interlayer position in the bag body 10. By utilizing the low thermal conductivity of the non-woven fabric and the poor thermal conductivity of air in its internal pores, it not only significantly enhances the heat insulation effect of the packaging bag and slows down the temperature change of the contents, but more importantly, it effectively isolates or slows down the rapid transfer of extreme temperatures of the contents to the outer surface of the packaging bag. This fundamentally improves the user's discomfort caused by holding an overheated or overcooled packaging bag, and enhances the practicality and comfort of the product.

[0043] In this embodiment, the barrier layer primarily reflects inward thermal radiation from the external environment and outward thermal radiation from the internal contents. The adjacent nonwoven fabric layer further traps air through its porous structure, effectively blocking and mitigating heat conducted through the barrier layer (or heat conducted out of the contents) by utilizing the low thermal conductivity of air and the fibers themselves. This layered configuration effectively controls both radiative and conductive heat. Placing the nonwoven fabric layer between the barrier layer and the inner heat-sealing layer maximizes its thermal resistance characteristics, creating a barrier along the critical path of heat transfer.

[0044] In one embodiment, the outer support film layer 20 is a polyethylene terephthalate film.

[0045] In this embodiment, the bag body 10 structure comprises, from the outside to the inside, a polyethylene terephthalate (PET) film, a barrier layer 30, a non-woven fabric layer 50, and an inner heat-sealing layer 40. PET film is chosen as the outer support film layer 20 because it possesses excellent mechanical properties, such as high tensile strength, high tear strength, and good dimensional stability, providing sufficient mechanical support and puncture resistance for the packaging bag. Furthermore, PET film has good printability, facilitating the printing of patterns and text.

[0046] In one embodiment, the barrier layer 30 is an aluminized polyethylene terephthalate film.

[0047] In this embodiment, the bag body 10 structure comprises, from the outside to the inside, a polyethylene terephthalate (PET) film, an aluminized polyethylene terephthalate (aluminized PET) film, a non-woven fabric layer 50, and an inner heat-sealing layer 40.

[0048] Aluminized PET (film) layer was chosen as the barrier layer 30 because it combines the excellent physical and mechanical properties of PET film with the superior barrier properties of aluminum. The aluminized layer has a good metallic luster and can reflect heat radiation, thus playing an auxiliary role in thermal insulation.

[0049] In one embodiment, the aluminum coating thickness of the aluminized polyethylene terephthalate film is 30-50 nanometers.

[0050] In this embodiment, controlling the thickness of the aluminized layer in the aluminized PET (film) layer within the range of 30-50 nanometers is an optimization of cost and processing technology while ensuring sufficient barrier performance and heat reflection effect. An excessively thin aluminized layer may result in insufficient barrier performance, while an excessively thick aluminized layer will increase costs.

[0051] In one embodiment, the nonwoven layer 50 has a basis weight of 15-60 g / m².

[0052] In this embodiment, the selection of this parameter range is based on a comprehensive consideration of thermal insulation performance, overall thickness of the packaging bag, and flexibility. The basis weight of the nonwoven fabric directly affects its fiber density and air content, thus affecting its thermal insulation performance. A nonwoven layer 50 with a basis weight that is too low (below 15 g / m²) has sparse fibers and insufficient air retention, potentially resulting in unsatisfactory thermal insulation. Conversely, a nonwoven layer 50 with a basis weight that is too high (above 60 g / m²), while potentially providing better thermal insulation, increases the overall thickness of the packaging bag, reduces its flexibility and ease of use, and also increases material costs.

[0053] Therefore, controlling the weight of the nonwoven fabric layer 50 within the range of 15-60 g / m² can ensure good heat insulation performance while maintaining the good flexibility and feel of the packaging bag.

[0054] In one embodiment, the inner heat-sealing layer 40 is a low-temperature heat-sealing polyethylene film, and the low-temperature heat-sealing polyethylene film used has a self-sealing temperature range of 80-120°C.

[0055] In this embodiment, the innermost heat-sealing layer 40 of the bag body 10 structure is made of low-temperature heat-sealing polyethylene (PE) film. Low-temperature heat-sealing PE film was chosen as the inner heat-sealing layer 40 because PE film has excellent heat-sealing performance and good chemical stability. Compared to ordinary PE film, low-temperature heat-sealing PE film has a lower heat-sealing temperature, which is especially important in multi-layer structures including a non-woven fabric layer 50. Because the non-woven fabric layer 50 has a certain heat insulation effect, it may affect the efficiency and effectiveness of conventional heat-sealing processes. By using low-temperature heat-sealing PE film, even if the insulation layer blocks some heat transfer, reliable heat sealing can be achieved at a relatively low temperature.

[0056] Self-sealing temperature refers to the temperature range within which a material can achieve effective heat sealing. In this embodiment, the self-sealing temperature of the low-temperature heat-sealing PE film is controlled within the range of 80-120℃, which is lower than the heat-sealing temperature of conventional PE films.

[0057] Within the self-sealing temperature range of 80-120℃, even after 50% heat loss through the nonwoven fabric layer, sufficient temperature can still be formed between the heating element and the heat-sealing layer of the heat-sealing equipment to ensure the reliability and sealing of the heat seal.

[0058] In one embodiment, a first coating layer 61 is provided between the barrier layer 30 and the nonwoven fabric layer 50, and a second coating layer 62 is provided between the nonwoven fabric layer 50 and the inner heat-sealing layer 40.

[0059] In this embodiment, the structure of the bag body 10 is changed from the outside to the inside as follows: outer support film layer 20, barrier layer 30, first coating layer 61, non-woven fabric layer 50, second coating layer 62, and inner heat-sealing layer 40.

[0060] The first coating layer 61 is located between the barrier layer 30 and the nonwoven fabric layer 50, and its main function is to enhance the adhesion and structural stability between the two layers. Metallized surfaces (such as aluminized PET) have poor direct adhesion to fibrous materials (such as nonwoven fabric). By introducing the first coating layer 61, the adhesive strength between the two can be improved, preventing interlayer separation during use.

[0061] The second coating layer 62 is located between the nonwoven fabric layer 50 and the inner heat-sealing layer 40. Its main function is to enhance the adhesion strength between the nonwoven fabric and the heat-sealing layer, and to provide a certain degree of physical protection for the nonwoven fabric. The nonwoven fabric surface is porous and irregular, and direct contact with the heat-sealing layer may lead to uneven heat sealing or insufficient heat sealing strength. The second coating layer 62 can fill the irregular structure of the nonwoven fabric surface, providing a relatively smooth surface, which is conducive to good bonding with the heat-sealing layer in the future.

[0062] By introducing these two coating layers, this embodiment not only enhances the interlayer bonding strength of the entire multilayer structure and improves the overall durability of the packaging bag, but also optimizes the stability and reliability of the heat sealing process, while maintaining the good thermal insulation performance of the nonwoven layer 50.

[0063] In one embodiment, the first coating layer 61 is composed of polypropylene resin, or polyethylene resin, or a mixture of the two; when the first coating layer 61 is composed of a mixture of polypropylene resin and polyethylene resin, the mixing ratio is 1:1 to 5:1 (polypropylene resin: polyethylene resin); and the second coating layer 62 is composed of polyethylene resin.

[0064] In this embodiment, the first coating layer 61 is made of polypropylene (PP) resin, polyethylene (PE) resin or a mixture thereof, because these materials have good adhesion to the barrier layer 30 (such as aluminized PET) and the nonwoven fabric layer 50.

[0065] When using a mixture of PP and PE, the mixing ratio is PP:PE = 1:1 to 5:1. By adjusting the ratio, a balance can be achieved between the strength and heat resistance of PP and the heat-sealing performance and flexibility of PE, so that the coating layer has sufficient mechanical strength and can achieve a good composite effect with adjacent layers.

[0066] The second coating layer 62 is made of polyethylene (PE) resin. This is because the inner low-temperature heat-sealable PE film and the polyethylene resin coating layer have better compatibility and hot melt adhesion strength, which can ensure excellent bonding force between them, avoid delamination, and ensure the integrity and sealing reliability of the packaging bag.

[0067] By specifically selecting and proportioning the materials of the first coating layer 61 and the second coating layer 62, the composite strength and overall structural stability between the nonwoven layer 50 and the adjacent functional layers can be optimized. In particular, considering that the inner heat-sealing layer 40 is a low-temperature heat-sealing PE film, a firm bond with the inner side of the nonwoven layer 50 is ensured.

[0068] In one embodiment, an adhesive layer 70 is further provided between the barrier layer 30 and the first coating layer 61.

[0069] In this embodiment, an adhesive layer 70 is provided between the barrier layer 30 (aluminized PET layer) and the first coating layer 61 to ensure a strong bond between the two layers. The bonding of the aluminized PET layer to the coating structure (i.e., the aluminized PET layer and the first coating layer) can be achieved using an adhesive to obtain superior interlayer peel strength and bonding quality. The adhesive is the adhesive layer 70, and the adhesive should be compatible with the materials of the aluminized PET layer and the first coating layer 61 and able to withstand the conditions of subsequent processing.

[0070] This structure, which includes an adhesive layer 70, further ensures the tight bond between the various functional layers of the packaging bag, prevents delamination during use, and guarantees the overall integrity and durability of the packaging bag.

[0071] In one embodiment, the packaging bag further includes a bag bottom 80, which includes a polyethylene terephthalate film 81, an aluminized polyethylene terephthalate film 82, and a heat-sealable polyethylene film 83 distributed sequentially from the outside to the inside.

[0072] In this embodiment, the heat-insulating packaging bag not only has the bag body 10 structure of the aforementioned embodiment, but also includes a bag bottom 80. The structure of the bag bottom 80 is different from the multi-layer structure of the bag body 10, and from the outside to the inside, it consists of: polyethylene terephthalate (PET) film, aluminized polyethylene terephthalate (aluminized PET) film, and heat-sealable polyethylene (PE) film.

[0073] The design of having different structures for the bag body 10 and the bag bottom 80 is based on the following considerations:

[0074] The bag body 10 is the area where users primarily hold the bag, requiring high levels of insulation and protection against burns / freezing. Therefore, it employs a complex structure including a non-woven fabric layer 50. The bag bottom 80, on the other hand, mainly serves a supporting and sealing function, with relatively lower requirements for insulation and grip comfort.

[0075] The structural materials and processing costs of the bag body 10 are relatively high. The bag bottom 80 adopts a relatively simplified and mature conventional liquid packaging bag lamination structure, which can effectively reduce the overall packaging cost without sacrificing the basic performance of the packaging bag (such as barrier properties and sealing properties). The forming and heat sealing processes of the bag bottom 80 are relatively simple, and the use of a conventional structure is conducive to improving production efficiency.

[0076] This differentiated design of the bag body 10 and the bag bottom 80 ensures excellent thermal insulation performance and user experience in key areas (the bag body), while also taking into account economy and production efficiency. The heat-sealing PE film for the bag bottom 80 can be a regular PE film, which can be selected according to production process requirements. The bag body 10 and the bag bottom 80 are connected by heat sealing or other methods to form a complete packaging container.

[0077] In one embodiment, the packaging bag also includes a clip 91 and a threaded cap 92.

[0078] In this embodiment, in addition to the bag body 10 and bag bottom 80 structures described in the previous embodiment, the heat-insulating packaging bag also has a spout 91 at the top of the bag body 10, and is equipped with a threaded bottle cap 92 that can be threaded into the spout 91. The spout 91 and the threaded bottle cap 92 are the opening and sealing components of the liquid packaging bag, making it convenient for consumers to pour out the contents and reseal.

[0079] The spout 91 (also known as the suction nozzle) is injection molded from plastic material (such as PE or PP) and is connected and fixed to the bag body 10 of the packaging bag by means of heat sealing or other methods. The threaded cap 92 is threadedly engaged with the spout 91 and is opened and closed by rotation, providing a reliable seal to prevent leakage of contents.

[0080] This insulated packaging bag with a spout 91 and a threaded cap 92 is particularly suitable for holding various liquid products that need to be consumed or used in multiple servings, such as beverages and dairy products.

[0081] The above description is merely a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in this utility model, and these modifications or substitutions should all be covered within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the scope of the claims.

Claims

1. A thermally insulated packaging, comprising a bag body having a multi-layer structure, the multi-layer structure comprising at least an outer support film layer, a barrier layer disposed inside the outer support film layer, and an inner heat-sealing layer disposed inside the barrier layer, characterized in that, A non-woven fabric layer is disposed between the barrier layer and the inner heat-sealing layer; A first coating layer is provided between the barrier layer and the nonwoven fabric layer, and a second coating layer is provided between the nonwoven fabric layer and the inner heat-sealing layer; an adhesive layer is also provided between the barrier layer and the first coating layer.

2. The thermal insulation packaging according to claim 1, characterized in that, The outer support film is a polyethylene terephthalate film.

3. The thermal insulation packaging according to claim 2, characterized in that, The barrier layer is an aluminized polyethylene terephthalate film.

4. The thermal insulation packaging according to claim 3, characterized in that, The aluminum coating thickness of the aluminized polyethylene terephthalate film is 30-50 nanometers.

5. The thermal insulation packaging according to any one of claims 1 to 4, characterized in that, The weight of the nonwoven fabric layer is 15-60 g / m².

6. The thermal insulation packaging according to claim 5, characterized in that, The inner heat-sealing layer is a low-temperature heat-sealing polyethylene film, and the self-sealing temperature range of the low-temperature heat-sealing polyethylene film is 80-120℃.

7. The thermal insulation packaging according to claim 1, characterized in that, The thermal insulation packaging also includes a bag bottom, which comprises, from the outside to the inside, a polyethylene terephthalate film, an aluminized polyethylene terephthalate film, and a heat-sealable polyethylene film.

8. The thermal insulation packaging according to claim 7, characterized in that, The thermal insulation packaging also includes a spout and a threaded cap.

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