Damp-proof one-way pressure release valve assembly for packaging application

Abstract

The invention relates to the technical field of food packaging, and discloses a moisture-proof one-way pressure release valve assembly for packaging application, which comprises a valve body, the valve body is of an integrated structure, a circular hole for ventilation is formed in the middle of the valve body, a ventilation membrane is arranged at the bottom of the valve body, and the membrane surface of the ventilation membrane has oleophobic and hydrophobic characteristics. A gasket integrally welded with the bottle cap is arranged on the upper portion of the valve body, the gasket is used for being combined with the bottle cap to play a sealing role, a gasket pressing ring and an inner silica gel gasket are sequentially arranged between the gasket and the valve body from top to bottom, and the gasket pressing ring is used for tightly locking the inner silica gel gasket in a groove of the valve body. The effect of one-way ventilation and pressure relief can be achieved, air pressure generated in the package can be released, negative pressure is prevented from being formed in the package, and package spalling caused by too high air pressure in the package is prevented; gas can be allowed to pass through but moisture is not allowed to pass through, so that external moisture can be prevented from entering the package, and contents are prevented from going bad.

Description

Technical Field

[0001] The invention relates to the technical field of food packaging, in particular to a moisture-proof one-way pressure relief valve assembly for packaging applications. Background Art

[0002] Currently, the waterproof and breathable products on the market are all two-way breathable, which cannot effectively prevent moisture from entering the bottle, resulting in some water vapor entering the bottle and causing moisture, thereby affecting product quality. Therefore, they cannot be used for packaging products that are easily affected by moisture or easily deteriorate when exposed to gas or easily evaporate to produce gas, such as puffed food, milk powder, bleach, etc. A moisture-proof one-way pressure relief valve assembly for packaging applications is now proposed to solve the above problems. Summary of the invention

[0003] 1. Technical issues to be resolved In view of the shortcomings of the prior art, the present invention provides a moisture-proof one-way pressure relief valve assembly for packaging applications, which can achieve the effect of one-way air permeability and pressure relief, release the air pressure generated inside the package, and prevent the package from bursting due to excessive internal air pressure, etc., solving the problem that existing waterproof and breathable products cannot effectively prevent moisture from entering the bottle.

[0004] (II) Technical solution In order to achieve the above-mentioned purpose of one-way air permeability and pressure relief, the present invention provides the following technical solutions: a moisture-proof one-way pressure relief valve assembly for packaging applications, comprising a valve body, the valve body being an integrated structure, a circular hole for air permeability being provided in the middle of the valve body, a breathable membrane being provided at the bottom of the valve body, a membrane surface of the breathable membrane having oleophobic and hydrophobic properties, a gasket welded to the bottle cap being provided at the upper part of the valve body, the gasket being used to seal in combination with the bottle cap, a gasket pressing ring and an inner silicone gasket being provided in sequence from top to bottom between the gasket and the valve body, the function of the gasket pressing ring being to tightly lock the inner silicone gasket in the groove of the valve body, and the inner silicone gasket being provided with one or more cross-cut holes for air permeability and controlling the air permeability rate.

[0005] Furthermore, grooves are provided on both the upper and lower sides of the valve body, which are used to place the breathable membrane and the inner silicone gasket and the gasket pressure ring respectively.

[0006] Furthermore, the valve body is combined with the breathable membrane and the gasket by heat welding or ultrasonic welding.

[0007] Furthermore, the gasket is an aluminum foil induction gasket or a foam gasket.

[0008] It also includes a valve cover embedded in the bottle cap, wherein the top of the valve cover is provided with two or more air holes, a circle of raised limit blocks is provided on the inner side of the valve cover around the air holes, the valve cover is buckled with the valve body through a snap-fit ​​structure, a breathable membrane is provided at the bottom of the valve body, and an inner silicone gasket located in the inner cavity of the valve cover is provided on the upper part of the valve body; the inner silicone gasket can move up and down in the space formed by the valve body and the valve cover, mainly to block outside air from entering the interior, and cooperate with the limit blocks to prevent the inner silicone gasket from blocking the air holes.

[0009] Furthermore, the air-permeable membrane is welded to the bottom of the valve body by a thermal welding process.

[0010] (III) Beneficial effects Compared with the prior art, the present invention provides a moisture-proof one-way pressure relief valve assembly for packaging applications, which has the following beneficial effects: 1. The moisture-proof one-way pressure relief valve assembly used for packaging can achieve the effect of one-way air permeability and pressure relief, release the air pressure generated inside the package, avoid the formation of negative pressure inside the package, and prevent the package from bursting due to excessive internal air pressure; it can allow gas to pass but not water to pass, so as to prevent external moisture from entering the package and prevent the contents from deteriorating.

[0011] 2. The moisture-proof one-way pressure relief valve assembly used for packaging can prevent the expansion and contraction of packaging caused by changes in temperature and humidity during transportation and storage, thereby protecting the product from the influence of the external environment and extending the shelf life of the product. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 This is a schematic diagram of the explosion structure of Embodiment 1 of the present invention; Figure 2 This is a schematic diagram of a finished product of Embodiment 1 of the present invention; Figure 3 This is a schematic diagram of the working principle of the first embodiment of the present invention; Figure 4 This is a schematic diagram of the installation of the first embodiment of the present invention; Figure 5 This is a schematic diagram of the explosion structure of the second embodiment of the present invention; Figure 6 This is a schematic diagram of the finished product of Embodiment 2 of the present invention; Figure 7 This is a schematic diagram of the pressure relief working principle of the second embodiment of the present invention; Figure 8 This is a schematic diagram of the plugging working principle of the second embodiment of the present invention; Fig. 9 This is a schematic diagram of the installation of the second embodiment of the present invention.

[0013] In the figure: 1-valve body, 2-breathable diaphragm, 3-gasket, 4-gasket pressure ring, 5-inner silicone gasket, 6-valve cover, 7-limit block. DETAILED DESCRIPTION

[0014] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0015] Embodiment 1: See also Figure 1-Figure 4 , a moisture-proof one-way pressure relief valve assembly for packaging applications, including a valve body 1, which is made of plastic material, including but not limited to polypropylene, polyethylene, polyester and the like. The valve body 1 is an integrated structure, a round hole for ventilation is provided in the middle of the valve body 1, and a breathable membrane 2 is provided at the bottom of the valve body 1. The breathable membrane 2 is made of a composite membrane of an ePTFE layer and a non-woven fabric layer or a single-layer ePTFE membrane, wherein the ePTFE membrane is a microporous membrane formed by expanding and stretching polytetrafluoroethylene as a raw material, so the surface of the breathable membrane 2 has oleophobic and hydrophobic properties; a gasket 3 welded to a bottle cap is provided on the upper part of the valve body 1, the valve body 1 is combined with the breathable membrane 2 and the gasket 3 by heat welding or ultrasonic welding, and a gasket 3 is provided between the gasket 3 and the valve body 1 from top to bottom. There are a gasket pressing ring 4 and an inner silicone gasket 5. Grooves are arranged on the upper and lower sides of the valve body 1, which are respectively used to place the breathable membrane 2 and the inner silicone gasket 5 and the gasket pressing ring 4. The inner silicone gasket 5 is provided with one or more cross-cut holes for ventilation and controlling the ventilation rate, and is made of soft silicone rubber with a Shore hardness of 20-50HA and a thickness of 0.05-0.3mm; the gasket pressing ring 4 is made of plastic material, including but not limited to polypropylene, polyethylene, polyester and other materials, and its function is to tightly lock the inner silicone gasket 5 in the groove of the plastic valve body 1; the gasket 3 is an aluminum foil induction gasket or a foam gasket, and a small hole for ventilation is opened in the middle of the gasket 3, which is used to seal with the bottle cap, and the upper surface of the gasket 3 is flush with the upper surface of the bottle cap.

[0016] The one-way pressure relief valve assembly is installed in the same way as a traditional gasket. It only needs to be welded to the breathable gasket by heat welding, or the breathable gasket can be welded to the bottle mouth by electromagnetic induction. The operation is simple.

[0017] How it works: When the air pressure inside the bottle is greater than the external air pressure, the gas inside the bottle passes through the circular hole between the breathable membrane 2 and the plastic valve body 1. At this time, the inner silicone gasket 5 tightly attached to the plastic valve body is slightly lifted up by the gas, and the gas is discharged through the cross-cut small hole on the inner silicone gasket 5; when the air pressure inside the bottle is lower than the external air pressure, since the inner silicone gasket 5 is tightly attached to the plastic valve body 1, the gas cannot enter the bottle through the cross-cut small hole, so the external air is isolated, which plays a moisture-proof role.

[0018] Embodiment 2: See also Figure 5-Figure 9 A moisture-proof one-way pressure relief valve assembly for packaging applications, comprising a valve cover 6 embedded in a bottle cap, the valve cover 6 and the valve body 1 are both made of food-grade polypropylene, the top of the valve cover 6 is provided with two or more air holes, a circle of raised limit blocks 7 are provided on the inner side of the valve cover 6 around the air holes, the valve cover 6 is buckled with the valve body 1 through a snap-fit ​​structure, when subjected to external air pressure, the inner silicone gasket 5 and the plane of the top of the valve body 1 are tightly fitted to prevent external gas from entering, and the material is soft silicone rubber, the Shore hardness is 20-50HA, and the thickness is 0.05-0.3mm; a breathable membrane 2 is provided at the bottom of the valve body 1 The breathable membrane 2 is welded to the bottom of the valve body 1 by a thermal welding process; the breathable membrane 2 is composited by an ePTFE layer and a polyolefin non-woven fabric layer, wherein the ePTFE layer is a microporous membrane formed by expanding and stretching polytetrafluoroethylene as a raw material, so the surface of the breathable membrane 2 has oleophobic and hydrophobic properties; and the polyolefin non-woven fabric layer is similar to the polypropylene material of the valve body 1 and is meltable and can be thermally welded; an inner silicone gasket 5 located in the inner cavity of the valve cover 6 is provided on the upper part of the valve body 1, and the inner silicone gasket 5 can move up and down in the space formed by the valve body 1 and the valve cover 6, mainly to block the outside air from entering the interior.

[0019] The one-way pressure relief valve assembly can be installed on a bottle cap with a reserved installation groove only by pressing with fingers, and the operation is simple.

[0020] How it works: When the internal air pressure is greater than the external air pressure, the air in the bottle enters the valve body 1 from the bottom breathable membrane 2, the inner silicone gasket 5 is lifted up by the air pressure and blocked by the limit block 7, so the air can flow out from the air hole above; when the external air pressure is greater than the internal air pressure, the air enters the valve body 1 from the top air hole, the inner silicone gasket 5 is pressed to the smooth surface of the valve body 1 by the air pressure, and the air is blocked and cannot pass through the breathable membrane 2 to enter the interior.

[0021] The one-way pressure relief valve assembly can achieve the effect of one-way air permeability and pressure relief, and can release the air pressure generated inside the package to avoid the formation of negative pressure inside the package, and prevent the package from bursting due to excessive internal air pressure; it can allow gas to pass but not water to pass, thus preventing external moisture from entering the package and preventing the contents from deteriorating.

[0022] It can also prevent the expansion and contraction of packaging caused by changes in temperature and humidity during transportation and storage, thereby protecting the product from the influence of the external environment and extending the shelf life of the product.

[0023] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A moisture-proof one-way pressure relief valve assembly for packaging applications, comprising a valve body (1), wherein the valve body (1) is an integrated structure, and a circular hole for air permeability is provided in the middle of the valve body (1), characterized in that: A breathable membrane (2) is arranged at the bottom of the valve body (1), a gasket (3) welded to the bottle cap is arranged at the top of the valve body (1), a gasket pressing ring (4) and an inner silicone gasket (5) are arranged in sequence from top to bottom between the gasket (3) and the valve body (1), and the inner silicone gasket (5) is provided with one or more cross-cut holes for air permeation and air permeation rate control.

2. A moisture-proof one-way pressure relief valve assembly for packaging applications according to claim 1, characterized in that: The valve body (1) is provided with grooves on both the upper and lower sides, which are used to accommodate the breathable membrane (2) and the inner silicone gasket (5) and the gasket pressure ring (4), respectively.

3. The moisture-proof one-way pressure relief valve assembly for packaging applications according to claim 1, characterized in that: The valve body (1) is combined with the breathable membrane (2) and the gasket (3) by means of thermal welding or ultrasonic welding.

4. The moisture-proof one-way pressure relief valve assembly for packaging applications according to claim 1, characterized in that: The gasket (3) is an aluminum foil induction gasket or a foam gasket.

5. The moisture-proof one-way pressure relief valve assembly for packaging applications according to claim 1, characterized in that: It also includes a valve cover (6) embedded in the bottle cap, wherein the top of the valve cover (6) is provided with two or more air holes, and a circle of raised limit blocks (7) are provided on the inner side of the valve cover (6) around the air holes. The valve cover (6) is buckled with the valve body (1) through a snap-fit ​​structure, a breathable membrane (2) is provided at the bottom of the valve body (1), and an inner silicone gasket (5) located in the inner cavity of the valve cover (6) is provided on the upper part of the valve body (1).

6. A moisture-proof one-way pressure relief valve assembly for packaging applications according to claim 5, characterized in that: The air-permeable membrane (2) is welded to the bottom of the valve body (1) by a thermal welding process.

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