Negative pressure valve pocket and method of making same

Abstract

The application discloses a negative pressure valve pocket and a preparation method thereof. The negative pressure valve pocket comprises a negative pressure valve pocket body and a negative pressure valve pocket valve port. The negative pressure valve pocket body comprises an upper top, front and back wide walls, left and right side narrow walls and a lower bottom. The front and back wide walls comprise inner layers, middle layers and outer layers. The left and right side narrow walls comprise inner layers, middle layers and outer layers. The upper part of the inner layers of the front and back wide walls is provided with N rows of upper exhaust holes arranged in a transverse direction. The middle part of the middle layers of the front and back wide walls is provided with M rows of middle exhaust holes arranged in a transverse direction. The outer layers of the left and right side narrow walls are provided with P columns of side exhaust holes arranged in a vertical direction. N, M and P are integers greater than 1. The application is particularly suitable for loading light materials such as fumed silica.

Description

Technical Field

[0001] This invention relates to valve bags, and more particularly to a negative pressure valve bag and its preparation method. Background Technology

[0002] Fumed silica refers to silica produced by the gas phase method. It is a nano-sized white powder generated by the high-temperature hydrolysis of silicon halides in an oxyhydrogen flame. It is commonly known as fumed silica. It is an amorphous silica product with a primary particle size between 7 and 40 nm, an aggregate particle size of about 200-500 nm, a specific surface area of ​​100-400 m2 / g, high purity, SiO2 content of not less than 99.8%, and light weight.

[0003] Because of its light weight, fumed silica cannot be filled using a positive pressure valve bag. The filling process requires a vacuum chamber to create a negative pressure environment for filling.

[0004] This filling method places very high demands on the venting of the valve bag. The air permeability of the valve bag body will have a significant impact on the filling quality and filling speed of the material. In order to improve the air permeability of the valve bag, the existing method used on the market is to uniformly drill ultra-fine holes on the inner and outer layers of the valve bag. When sealing the inner and outer layers, the holes on the inner layer are staggered with the holes on the outer layer. This method reduces the overall strength of the valve bag on the one hand, and the air permeability is relatively poor on the other hand, and the sealing performance of the valve bag is poor after filling.

[0005] The above background information is provided to facilitate understanding of the present invention and is not intended to be publicly known technology disclosed to the general public prior to the application of this invention. Summary of the Invention

[0006] To address the aforementioned shortcomings, this invention provides a negative pressure valve bag, which is particularly suitable for filling lightweight materials such as fumed silica.

[0007] The technical solution is as follows: A negative pressure valve pocket includes a negative pressure valve pocket body and a negative pressure valve pocket port. The negative pressure valve pocket body includes an upper top, front and rear wide walls, left and right narrow walls, and a lower bottom. The front and rear wide walls include an inner layer, a middle layer, and an outer layer. The left and right narrow walls include an inner layer, a middle layer, and an outer layer. The upper part of the inner layer of the front and rear wide walls has N rows of horizontally arranged upper exhaust holes. The middle part of the middle layer of the front and rear wide walls has M rows of horizontally arranged middle exhaust holes. The outer layer of the left and right narrow walls has P columns of vertically arranged side exhaust holes. N is an integer greater than 1, M is an integer greater than 1, and P is an integer greater than 1.

[0008] Furthermore, the front and rear wide inner wall layers are integrated with the left and right narrow inner wall layers, the front and rear wide middle layers are integrated with the left and right narrow middle layers, and the front and rear wide outer layers are integrated with the left and right narrow outer layers.

[0009] Furthermore, N ranges from 3 to 50.

[0010] Furthermore, the upper exhaust hole is a round hole, the middle exhaust hole is a round hole, and the side exhaust hole is a round hole.

[0011] Furthermore, the upper exhaust port is a quincunx hole, the middle exhaust port is a quincunx hole, and the side exhaust port is a quincunx hole.

[0012] The present invention also provides a method for preparing a negative pressure valve pocket.

[0013] The technical solution is: a method for preparing the above-mentioned negative pressure valve pocket, comprising the following steps:

[0014] S1, Prepare the negative pressure valve pocket body;

[0015] S11, respectively take the first substrate, the second substrate and the third substrate;

[0016] S12, an upper vent hole is formed on the first substrate, a middle vent hole is formed on the second substrate, and a side vent hole is formed on the third substrate;

[0017] S13, the first substrate, the second substrate and the third substrate form the negative pressure valve pocket body;

[0018] S2, forming the negative pressure valve pocket valve port;

[0019] S3 forms a negative pressure valve pocket.

[0020] Furthermore, in S12, when forming the quincunx holes, the drilling direction is measured from the inside and outside of the negative pressure valve pocket body formed by the first substrate, the second substrate, and the third substrate, and is drilling from the outside to the inside. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the overall structure of the negative pressure valve pocket of the present invention;

[0022] Figure 2 This is an exploded structural diagram of the front and rear wide walls of Embodiment 1 of the present invention;

[0023] Figure 3 This is an exploded structural diagram of the narrow wall on the right side of Embodiment 1 of the present invention;

[0024] Figure 4 This is an exploded structural diagram of the front and rear wide walls of Embodiment 2 of the present invention;

[0025] Figure 5 This is an exploded structural diagram of the narrow wall on the right side of Embodiment 2 of the present invention;

[0026] Figure 6 This is a schematic diagram of the plum blossom hole structure in Embodiment 2 of the present invention;

[0027] In the diagram: 1. Negative pressure valve pocket body; 11. Front and rear wide walls; 111. Inner layer of front and rear wide walls; 112. Middle layer of front and rear wide walls; 113. Outer layer of front and rear wide walls; 114. Upper exhaust port; 115. Middle exhaust port; 12. Left and right narrow walls; 121. Inner layer of left and right narrow walls; 122. Middle layer of left and right narrow walls; 123. Outer layer of left and right narrow walls; 124. Side exhaust port; 2. Negative pressure valve pocket valve port. Detailed Implementation

[0028] The invention will now be further described with reference to the accompanying drawings.

[0029] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, an indirect connection via an intermediate medium, or the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0030] In the description of this invention, it should be understood that the terms "upper," "lower," "front," "rear," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this invention and simplifying the description, and do not 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 invention. In the description of this invention, "a plurality of" means two or more, unless otherwise precisely specified.

[0031] The terms “first,” “second,” “third,” “fourth,” etc. (if present) in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a particular order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented, for example, in orders other than those illustrated or described herein. Furthermore, the terms “comprising” and “having,” and any variations thereof, are intended to cover a non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0032] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0033] The technical solution of the present invention will be described in detail below with reference to specific embodiments. These specific embodiments can be combined with each other, and the same or similar concepts or processes may not be described again in some embodiments.

[0034] Example 1

[0035] Please refer to Figures 1-3 , Figure 1 This is a schematic diagram of the overall structure of the negative pressure valve pocket of the present invention. Figure 2 This is an exploded structural diagram of the front and rear wide walls in this embodiment of the present invention. Figure 3 This is an exploded structural diagram of the narrow wall on the right side of this embodiment of the invention.

[0036] A negative pressure valve pocket includes a negative pressure valve pocket body 1 and a negative pressure valve pocket port 2. The negative pressure valve pocket body 1 includes an upper top, front and rear wide walls 11, left and right narrow walls 12, and a lower bottom. The front and rear wide walls 11 include an inner layer 111, a middle layer 112, and an outer layer 113. The left and right narrow walls 12 include an inner layer 121, a middle layer 122, and an outer layer 123. The inner layers 111 and 123 of the front and rear wide walls are connected. 121 are connected as one unit, the front and rear wide wall middle layer 112 and the left and right side narrow wall middle layer 122 are connected as one unit, the front and rear wide wall outer layer 113 and the left and right side narrow wall outer layer 123 are connected as one unit, the upper part of the front and rear wide wall inner layer 111 is provided with at least one row of horizontally arranged upper exhaust holes 114, the middle part of the front and rear wide wall middle layer 112 is provided with at least one row of horizontally arranged middle exhaust holes 115, and the left and right side narrow wall outer layer 123 is provided with at least one row of vertically arranged side exhaust holes 124.

[0037] In this invention, the areas through the upper exhaust hole 114, the middle exhaust hole 115, and the side exhaust hole 124 are specially designed. During the filling process, the airflow inside the bag flows laterally. There are gaps between the inner layer (left and right narrow wall inner layer 121 and front and rear wide wall inner layer 111) and the middle layer (left and right narrow wall middle layer 122 and front and rear wide wall middle layer 112) to allow gas to pass through. After passing through the middle layer, the air path swirls and is discharged vertically from the side exhaust hole 124 of the outer layer, thereby forming strong air permeability and improving the overall strength of the valve bag.

[0038] Those skilled in the art should know that the diameters of the upper vent 114, the middle vent 115, and the side vent 124 are smaller than the particle size of the material during loading, so as to avoid material leakage caused by the material being discharged with the gas during venting.

[0039] In one or more specific embodiments of the present invention, the upper exhaust port 114 has 3-50 rows, the middle exhaust port 115 has 3-50 rows, and the side exhaust port 124 has 3-50 rows.

[0040] In one or more specific embodiments of the present invention, the upper exhaust hole 114, the middle exhaust hole 115 and the side exhaust hole 124 are round holes.

[0041] A method for preparing a negative pressure valve pocket includes the following steps:

[0042] S1, The preparation of the negative pressure valve pocket body 1 includes the following steps:

[0043] S11, take the first substrate, the second substrate and the third substrate respectively, wherein the first substrate is used as the inner layer in the subsequently prepared negative pressure valve pocket body 1, the second substrate is used as the middle layer in the subsequently prepared negative pressure valve pocket body 1, and the third substrate is used as the outer layer in the subsequently prepared negative pressure valve pocket body 1.

[0044] In one or more specific embodiments of the present invention, the first substrate, the second substrate and the third substrate are made of the same material, which can be PP or PE, or the material used in the valve bag body in the prior art.

[0045] In one or more specific embodiments of the present invention, the materials of the first substrate, the second substrate and the third substrate may also be different, and the material used in the valve bag body in the prior art can be adopted.

[0046] S12, holes are drilled on the first substrate, the second substrate, and the third substrate respectively. The hole drilled on the first substrate becomes the upper vent 114 in the subsequently prepared negative pressure valve pocket body 1. The hole drilled on the second substrate becomes the middle vent 115 in the subsequently prepared negative pressure valve pocket body 1. The hole drilled on the third substrate becomes the side vent 124 in the subsequently prepared negative pressure valve pocket body 1. In this step, the shape of the hole is circular.

[0047] S13, the first substrate, the second substrate and the third substrate are formed into the negative pressure valve pocket body 1; in this step, heat sealing or other packaging methods in the prior art can be used.

[0048] S2, Prepare the negative pressure valve pocket valve port 2. In this invention, the negative pressure valve pocket valve port 2 is prepared using the existing valve pocket body method.

[0049] S3, seal the negative pressure valve pocket port 2 onto the negative pressure valve pocket body 1 to form a negative pressure valve pocket; in this step, the sealing installation can be performed using existing technology.

[0050] Example 2

[0051] Although Example 1 has better breathability compared to the prior art in the background art, there is still room for further improvement.

[0052] Please refer to Figure 1 , Figures 4-6 , Figure 1 This is a schematic diagram of the overall structure of the negative pressure valve pocket of the present invention. Figure 4 This is an exploded structural diagram of the front and rear wide walls in this embodiment of the present invention. Figure 5 This is an exploded structural diagram of the narrow wall on the right side of this embodiment of the invention. Figure 5 This is a schematic diagram of the plum blossom hole structure of the present invention.

[0053] A negative pressure valve pocket includes a negative pressure valve pocket body 1 and a negative pressure valve pocket port 2. The negative pressure valve pocket body 1 includes an upper top, front and rear wide walls 11, left and right narrow walls 12, and a lower bottom. The front and rear wide walls 11 include an inner layer 111, a middle layer 112, and an outer layer 113. The left and right narrow walls 12 include an inner layer 121, a middle layer 122, and an outer layer 123. The inner layers 111 and 122 of the front and rear wide walls are integrated. The rear wide wall middle layer 112 is connected to the left and right narrow wall middle layers 122 as one unit, and the front and rear wide wall outer layers 113 are connected to the left and right narrow wall outer layers 123 as one unit. The upper part of the front and rear wide wall inner layer 111 is provided with at least one row of horizontally arranged upper exhaust holes 114, the middle part of the front and rear wide wall middle layer 112 is provided with at least one row of horizontally arranged middle exhaust holes 115, and the left and right narrow wall outer layers 123 are provided with at least one row of vertically arranged side exhaust holes 124. The upper exhaust holes 114, middle exhaust holes 115 and side exhaust holes 124 are all quincunx holes.

[0054] In this invention, the areas through the upper exhaust port 114, the middle exhaust port 115, and the side exhaust port 124 are specially designed. During the filling process, the airflow inside the bag flows laterally. There are gaps between the inner layer (left and right narrow wall inner layer 121 and front and back wide wall inner layer 111) and the middle layer (left and right narrow wall middle layer 122 and front and back wide wall middle layer 112) to allow gas to pass through. After passing through the middle layer, the airflow swirls and is discharged vertically from the side exhaust port 124 of the outer layer, thereby creating strong air permeability and improving the overall strength of the valve bag. Setting the upper exhaust port 114, the middle exhaust port 115, and the side exhaust port 124 as a quincunx pattern further improves the air permeability of the negative pressure valve bag during filling.

[0055] Those skilled in the art should know that the diameters of the upper vent 114, the middle vent 115, and the side vent 124 are smaller than the particle size of the material during loading, so as to avoid material leakage caused by the material being discharged with the gas during venting.

[0056] In one or more specific embodiments of the present invention, the upper exhaust port 114 has 3-50 rows, the middle exhaust port 115 has 3-50 rows, and the side exhaust port 124 has 3-50 rows.

[0057] A method for preparing a negative pressure valve pocket includes the following steps:

[0058] S1, Prepare the negative pressure valve pocket body 1;

[0059] The preparation of the negative pressure valve pocket body 1 includes the following steps:

[0060] S11, take the first substrate, the second substrate and the third substrate respectively, wherein the first substrate is used as the inner layer in the subsequently prepared negative pressure valve pocket body 1, the second substrate is used as the middle layer in the subsequently prepared negative pressure valve pocket body 1, and the third substrate is used as the outer layer in the subsequently prepared negative pressure valve pocket body 1.

[0061] In one or more specific embodiments of the present invention, the first substrate, the second substrate and the third substrate are made of the same material, which can be PP or PE, or the material used in the valve bag body in the prior art.

[0062] In one or more specific embodiments of the present invention, the materials of the first substrate, the second substrate and the third substrate may also be different, and the material used in the valve bag body in the prior art can be adopted.

[0063] S12, holes are drilled on the first substrate, the second substrate, and the third substrate respectively. The hole drilled on the first substrate becomes the upper vent 114 in the subsequently prepared negative pressure valve pocket body 1. The hole drilled on the second substrate becomes the middle vent 115 in the subsequently prepared negative pressure valve pocket body 1. The hole drilled on the third substrate becomes the side vent 124 in the subsequently prepared negative pressure valve pocket body 1. In this step, the shape of the hole is plum blossom-shaped. In this step, when drilling the plum blossom-shaped hole, the drilling direction is from the inside to the outside (the inner surface of the first substrate is the inner surface of the inner layer after the negative pressure valve pocket body 1 is formed, and the outer surface is the outer surface of the inner layer after the negative pressure valve pocket body 1 is formed, and so on inwards).

[0064] S13, the first substrate, the second substrate and the third substrate are formed into the negative pressure valve pocket body 1; in this step, heat sealing or other packaging methods in the prior art can be used.

[0065] S2, Prepare the negative pressure valve pocket valve port 2. In this invention, the negative pressure valve pocket valve port 2 is prepared using the existing valve pocket body method.

[0066] S3, seal the negative pressure valve pocket port 2 onto the negative pressure valve pocket body 1 to form a negative pressure valve pocket; in this step, the sealing installation can be performed using existing technology.

[0067] Example 3

[0068] Although the negative pressure valve bag of Example 2 has good air permeability, the upper vent 114, middle vent 115 and side vent 124 of Example 2 are not closed after filling, resulting in poor sealing of the negative pressure valve bag.

[0069] A method for preparing a negative pressure valve pocket includes the following steps:

[0070] S1, The preparation of the negative pressure valve pocket body 1 includes the following steps:

[0071] S11, take the first substrate, the second substrate and the third substrate respectively, wherein the first substrate is used as the inner layer in the subsequently prepared negative pressure valve pocket body 1, the second substrate is used as the middle layer in the subsequently prepared negative pressure valve pocket body 1, and the third substrate is used as the outer layer in the subsequently prepared negative pressure valve pocket body 1.

[0072] In one or more specific embodiments of the present invention, the first substrate, the second substrate and the third substrate are made of the same material, which can be PP or PE, or the material used in the valve bag body in the prior art.

[0073] In one or more specific embodiments of the present invention, the materials of the first substrate, the second substrate and the third substrate may also be different, and the material used in the valve bag body in the prior art can be adopted.

[0074] S12, holes are drilled on the first substrate, the second substrate, and the third substrate respectively. The hole drilled on the first substrate becomes the upper vent 114 in the subsequently prepared negative pressure valve pocket body 1. The hole drilled on the second substrate becomes the middle vent 115 in the subsequently prepared negative pressure valve pocket body 1. The hole drilled on the third substrate becomes the side vent 124 in the subsequently prepared negative pressure valve pocket body 1. In this step, the shape of the hole is plum blossom-shaped. In this step, when drilling the plum blossom-shaped hole, the drilling direction is from the outside to the inside (the inner surface of the first substrate is the inner surface of the inner layer after the negative pressure valve pocket body 1 is formed, and the outer surface is the outer surface of the inner layer after the negative pressure valve pocket body 1 is formed, and so on inward).

[0075] S13, the first substrate, the second substrate and the third substrate are formed into the negative pressure valve pocket body 1; in this step, heat sealing or other packaging methods in the prior art can be used.

[0076] S2, Prepare the negative pressure valve pocket valve port 2. In this invention, the negative pressure valve pocket valve port 2 is prepared using the existing valve pocket body method.

[0077] S3, seal the negative pressure valve pocket port 2 onto the negative pressure valve pocket body 1 to form a negative pressure valve pocket; in this step, the sealing installation can be performed using existing technology.

[0078] Compared with Example 2, this embodiment differs in the direction of the perforation in S12. The perforation is done from the outside to the inside. During the negative pressure filling process, the pressure inside the bag increases and becomes greater than the external pressure. The perforated nozzle deforms outward, blocking the air pores and creating a sealing effect.

[0079] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A negative pressure valve pocket, comprising a negative pressure valve pocket body and a negative pressure valve pocket opening, the negative pressure valve pocket body comprising an upper top, front and rear wide walls, left and right narrow walls, and a lower bottom; the front and rear wide walls comprising an inner layer, a middle layer, and an outer layer; the left and right narrow walls comprising an inner layer, a middle layer, and an outer layer; characterized in that, The upper part of the inner layer of the front and rear wide walls has N rows of horizontally arranged upper exhaust holes, the middle part of the middle layer of the front and rear wide walls has M rows of horizontally arranged middle exhaust holes, and the outer layer of the left and right narrow walls has P columns of vertically arranged side exhaust holes. N is an integer greater than 1, M is an integer greater than 1, and P is an integer greater than 1. The upper exhaust port is a quincunx hole, the middle exhaust port is a quincunx hole, and the side exhaust port is a quincunx hole; when forming the quincunx hole, the drilling direction is from the outside of the negative pressure valve pocket to the inside. During filling, the airflow inside the bag enters the gap between the inner and middle layers through the upper exhaust holes of the front and rear wide inner layers, flows laterally, then enters the gap between the middle and outer layers through the middle exhaust holes of the front and rear wide middle layers, swirls, and is then discharged vertically from the side exhaust holes of the left and right narrow outer layers.

2. The negative pressure valve pocket according to claim 1, characterized in that, The front and rear wide inner wall layers are connected to the left and right narrow inner wall layers as one unit, the front and rear wide middle layer is connected to the left and right narrow middle layer as one unit, and the front and rear wide outer layer is connected to the left and right narrow outer wall layers as one unit.

3. The negative pressure valve pocket according to claim 1, characterized in that, N is 3-50.

4. A method for preparing a negative pressure valve bag according to any one of claims 1-3, characterized in that, Includes the following steps: S1, Prepare the negative pressure valve pocket body; S11, respectively take the first substrate, the second substrate and the third substrate; S12, an upper vent hole is formed on the first substrate, a middle vent hole is formed on the second substrate, and a side vent hole is formed on the third substrate; S13, the first substrate, the second substrate and the third substrate form the negative pressure valve pocket body; S2, forming the negative pressure valve pocket valve port; S3, forming a negative pressure valve pocket; In S12, when forming the plum blossom hole, the drilling direction is measured from the inside and outside of the negative pressure valve pocket body formed by the first substrate, the second substrate and the third substrate, and is from the outside to the inside.

Images