Composite film roll with easy venting structure

Abstract

The utility model is suitable for composite film technical field provides a kind of composite film roll with easy exhaust structure, including reel main body, composite film layer and end sealing assembly, the composite film layer surface evenly has first exhaust unit, the first exhaust unit is micron level exhaust hole that penetrates the composite film layer, and exhaust hole is along composite film layer length direction and presents single column interval arrangement;In the utility model, by setting first exhaust unit, utilize micron level exhaust hole that penetrates the composite film layer, combine anti-blocking coating, can directly and long-term stably discharge the air remaining between composite film layer, avoid the problem that membrane roll is loose caused by air accumulation, and the exhaust hole design of single column linear array distribution is guaranteed exhaust efficiency at the same time, maximum degree maintained the film layer structural integrity.

Description

Technical Field

[0001] This utility model belongs to the field of composite membrane technology, and in particular relates to a composite membrane roll with an easy-to-vent structure. Background Technology

[0002] During the production, storage, and use of composite membranes, air can easily remain between the membrane layers. Existing composite membrane rolls typically use a tight winding method and lack a dedicated venting structure, making it difficult to expel the residual air.

[0003] During storage, residual air can expand or contract due to temperature changes, which can easily cause the membrane roll to become loose, wrinkled, or even damaged. During use, air between the membrane layers can affect the bonding effect of the composite membrane and reduce product quality.

[0004] For example, in the food packaging industry, residual air in composite film rolls may cause air bubbles to appear inside the packaging, affecting the sealing and aesthetics of the packaging; in the electronic component packaging industry, residual air may introduce moisture and impurities, affecting the performance and lifespan of electronic components.

[0005] Therefore, a composite membrane roll with an easy-to-vent structure is needed to solve the above problems. Utility Model Content

[0006] The purpose of this utility model embodiment is to provide a composite film roll with an easy-to-vent structure to solve the problems mentioned in the background art.

[0007] To achieve the above objectives, this utility model provides the following technical solution:

[0008] A composite membrane roll with an easy-to-vent structure includes a roll body, a composite membrane layer, and an end sealing assembly. The surface of the composite membrane layer is uniformly distributed with first venting units for venting air between the composite membrane layers. The first venting unit is a micron-sized vent hole that penetrates the composite membrane layer, and the vent holes are arranged in a single row at intervals along the length of the composite membrane layer.

[0009] The outer surface of the roll body is provided with a second exhaust unit. The second exhaust unit is a spiral exhaust groove. The spiral exhaust groove corresponds to the position of the first exhaust unit and is interconnected with it. The second exhaust unit is used to guide the air discharged by the first exhaust unit to the end of the film roll.

[0010] The end sealing assembly is provided with a third exhaust unit inside, which is used to collect the air guided by the second exhaust unit and discharge it outside the membrane roll; the third exhaust unit is an annular air collection chamber, which is connected to the end of the second exhaust unit, and a one-way exhaust valve is provided in the annular air collection chamber.

[0011] In a further technical solution, the diameter of the micron-level exhaust hole of the first exhaust unit is 5-20μm, the distance between adjacent exhaust holes is 5-10cm, and the inner wall of the exhaust hole is provided with an anti-clogging coating, which can effectively prevent the exhaust hole from being blocked by the film material or external impurities.

[0012] In a further technical solution, the spiral exhaust groove of the second exhaust unit has a depth of 0.5-2mm, a width of 1-3mm, a helix angle of 30°-60°, and a pitch of 20-80mm. The spiral exhaust groove corresponds to the position of the first exhaust unit and is interconnected with it. The inner wall of the groove is provided with a smooth wear-resistant layer to reduce the resistance of air flow in the groove and improve the wear resistance of the groove.

[0013] In a further technical solution, the width of the annular air collection chamber of the third exhaust unit is 5-15mm, the depth is 3-8mm, and a transition rounded corner is provided at the connection between the annular air collection chamber and the spiral exhaust groove.

[0014] A further technical solution is that the one-way exhaust valve includes a valve body, a valve core, and an elastic reset element. The valve body is fixed in the annular air collection chamber, the valve core is connected to the valve body through the elastic reset element, and a sealing gasket is provided at the contact point between the valve core and the valve body. The opening pressure threshold of the one-way exhaust valve is 0.1-0.3 bar, ensuring that air can only be discharged from inside the membrane roll and preventing external air from entering.

[0015] A further technical solution is provided, wherein the composite membrane layer comprises a base layer, a functional layer, and a protective layer. The base layer is made of polyethylene material with a thickness of 0.5-2mm, providing basic support; the functional layer is made of breathable membrane material with a thickness of 0.2-1mm, assisting air circulation; the protective layer is made of polypropylene material with a thickness of 0.2-1mm, providing wear-resistant protection; and the first exhaust unit sequentially penetrates the protective layer, the functional layer, and the base layer, with a total thickness of 1-4mm for the composite membrane layer, giving the composite membrane layer good strength, breathability, and protective performance.

[0016] A further technical solution includes a left sealing cover and a right sealing cover, which are respectively fitted onto both ends of the roll body. A sealing ring is provided at the contact point between the left and right sealing covers and the roll body. The diameter of the sealing ring is 0.5-2 mm larger than that of the roll body. This improves the sealing performance of the film roll through elastic deformation, preventing external dust and moisture from entering. The axial gap between the end of the composite film layer and the inner end face of the sealing cover is 3-8 mm, and the radial gap between the outer surface of the composite film layer and the inner circular surface of the sealing cover is 2-5 mm, providing space for the venting structure and avoiding assembly interference.

[0017] Compared with the prior art, the beneficial effects of this utility model are:

[0018] This invention, by setting a first exhaust unit, utilizes micron-level exhaust holes that penetrate the composite membrane layer, combined with an anti-clogging coating, to directly and stably discharge residual air between the composite membrane layers, avoiding the problem of membrane roll loosening caused by air accumulation. The exhaust hole design with a single-row linear array ensures exhaust efficiency while maintaining the integrity of the membrane structure to the greatest extent.

[0019] This invention, by setting a second exhaust unit, uses a spiral exhaust groove with a specific pitch to communicate with the first exhaust unit. Combined with a smooth and wear-resistant layer, it can guide air to the end of the membrane roll. The structured channel reduces flow resistance and improves exhaust efficiency. The spiral helix angle and size design are adapted to the membrane roll winding characteristics to ensure continuous and stable airflow.

[0020] This invention, by setting a third exhaust unit, uses an annular air collection chamber to collect air, and combines it with a one-way exhaust valve with an opening pressure threshold to achieve complete air discharge and reverse sealing; the reasonable gap between the composite membrane and the sealing cover provides layout space for the exhaust structure, and at the same time, through the resistance difference design and one-way valve control, it ensures that the pressure in the air collection chamber can rise to drive the exhaust, and the gap can also balance abnormal pressure and adapt to component tolerances, thereby improving the robustness of the system.

[0021] To more clearly illustrate the structural features and effects of this utility model, the following detailed description of this utility model is provided in conjunction with the accompanying drawings and specific embodiments. Attached Figure Description

[0022] Figure 1 This is a three-dimensional structural diagram of the present invention from the front view;

[0023] Figure 2 This is a partial side view of the three-dimensional cross-sectional structure of the present invention;

[0024] Figure 3 This is a schematic diagram of the structure of the present invention in frontal three-dimensional cross-section;

[0025] Figure 4 This is a schematic diagram of the inner structure of the end sealing assembly of this utility model.

[0026] In the figure: 1. Roller body; 2. Composite film layer; 3. End sealing assembly; 4. First exhaust unit; 5. Second exhaust unit; 6. Third exhaust unit; 7. One-way exhaust valve; 8. Sealing ring; 9. Base layer; 10. Functional layer; 11. Protective layer. Detailed Implementation

[0027] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0028] The specific implementation of this utility model will be described in detail below with reference to specific embodiments.

[0029] Example 1

[0030] like Figures 1-4 As shown, this embodiment of the present invention provides a composite membrane roll with an easy-to-vent structure, including a roll body 1, a composite membrane layer 2, and an end sealing component 3. First venting units 4 are arranged in a linear array along the length of the middle portion of the surface of the composite membrane layer 2. The first venting unit 4 is a micron-sized vent hole penetrating the composite membrane layer 2, with a vent hole diameter of 10 μm and a spacing of 8 cm between adjacent vent holes. The inner wall of the vent hole is provided with an anti-clogging coating.

[0031] The outer surface of the main body 1 of the scroll is provided with a second exhaust unit 5. The second exhaust unit 5 is a spiral exhaust groove with a depth of 1mm, a width of 2mm, a spiral helix angle of 45°, and a pitch of 40mm. The spiral exhaust groove corresponds to the position of the first exhaust unit 4 and is interconnected. The inner wall of the groove is provided with a smooth wear-resistant layer.

[0032] The end sealing assembly 3 has a third exhaust unit 6 inside. The third exhaust unit 6 is an annular air collection chamber with a width of 10 mm and a depth of 5 mm. The annular air collection chamber is connected to the end of the second exhaust unit 5. The connection is provided with a transition rounded corner. The annular air collection chamber is provided with a one-way exhaust valve 7. The one-way exhaust valve 7 includes a valve body, a valve core and an elastic reset element. The valve body is fixed in the annular air collection chamber. The valve core is connected to the valve body through the elastic reset element. A sealing gasket is provided at the contact point between the valve core and the valve body. The opening pressure threshold of the one-way exhaust valve 7 is 0.2 bar.

[0033] The composite membrane layer 2 includes a base layer 9, a functional layer 10, and a protective layer 11. The base layer 9 is made of polyethylene material with a thickness of 1 mm; the functional layer 10 is made of breathable membrane material with a thickness of 0.5 mm; the protective layer 11 is made of polypropylene material with a thickness of 0.5 mm; the first exhaust unit 4 passes through the protective layer 11, the functional layer 10, and the base layer 9 in sequence, and the total thickness of the composite membrane layer 2 is 2 mm.

[0034] The end sealing assembly 3 includes a left sealing cover and a right sealing cover, which are respectively fitted onto both ends of the roll body 1. A sealing ring 8 is provided at the contact point with the roll body 1. The diameter of the sealing ring 8 is 1 mm larger than that of the roll body 1. The axial gap between the end of the composite film layer 2 and the inner end face of the sealing cover is 5 mm, and the radial gap between the outer surface of the composite film layer 2 and the inner circular surface of the sealing cover is 3 mm.

[0035] In this embodiment, when the composite membrane roll is wound, the air between the composite membrane layers 2 enters the spiral exhaust groove of the second exhaust unit 5 through the micron-sized exhaust holes of the first exhaust unit 4. The air flows along the spiral direction in the spiral exhaust groove to the annular air collection chamber of the third exhaust unit 6 at the end of the membrane roll. Since the air intake of the exhaust unit is greater than the gap leakage, the air pressure in the annular air collection chamber gradually increases to the opening pressure threshold of the one-way exhaust valve 7 (0.2 bar), pushing the valve core of the one-way exhaust valve 7 to open and expel the air outside the membrane roll. After the exhaust is completed, the pressure in the annular air collection chamber decreases, and the valve core closes under the action of the elastic reset member to prevent external air from entering.

[0036] Example 2

[0037] The difference between this embodiment and Embodiment 1 lies in the parameter settings of the first exhaust unit 4 and the second exhaust unit 5. The diameter of the micron-level exhaust hole of the first exhaust unit 4 is 5μm, and the spacing between adjacent exhaust holes is 5cm; the depth of the spiral exhaust groove of the second exhaust unit 5 is 0.5mm, the width is 1mm, the helix angle is 30°, and the pitch is 20mm; the opening pressure threshold of the one-way exhaust valve 7 is 0.1bar; the total thickness of the composite membrane layer 2 is 1mm; the axial gap between the end of the composite membrane layer 2 and the inner end face of the sealing cap is 3mm, and the radial gap is 2mm.

[0038] In this embodiment, the smaller vent size, pitch, and gap are suitable for scenarios with high venting accuracy requirements, such as composite film rolls for packaging precision electronic components. This allows for more precise exhaust of trace amounts of air between film layers, preventing residual air from affecting electronic components.

[0039] Example 3

[0040] The difference between this embodiment and Embodiment 1 lies in the parameter settings of the first exhaust unit 4 and the second exhaust unit 5. The diameter of the micron-level exhaust hole of the first exhaust unit 4 is 20μm, and the spacing between adjacent exhaust holes is 10cm; the depth of the spiral exhaust groove of the second exhaust unit 5 is 2mm, the width is 3mm, the helix angle is 60°, and the pitch is 80mm; the opening pressure threshold of the one-way exhaust valve 7 is 0.3bar; the total thickness of the composite membrane layer 2 is 4mm; the axial gap between the end of the composite membrane layer 2 and the inner end face of the sealing cap is 8mm, and the radial gap between the outer surface of the composite membrane layer 2 and the inner circular surface of the sealing cap is 5mm.

[0041] Larger vent diameter and spacing, deeper and wider spiral vent grooves, and larger axial and radial clearances make it suitable for applications requiring rapid venting, such as large food packaging composite film rolls. It can expel a large amount of air in a short time, improving packaging efficiency. It can also be adapted to production conditions with thick film layers and loose tolerance requirements, enhancing the structure's adaptability to different working conditions.

[0042] Working principle and usage process of this invention:

[0043] During the winding, storage, and use cycle of the composite membrane roll, the exhaust system achieves the orderly discharge of air between the membrane layers and the reverse isolation of external air through a synergistic mechanism of "multi-layer guidance + pressure drive + one-way sealing". The specific process is as follows:

[0044] When the composite membrane layer 2, consisting of the base layer 9, functional layer 10, and protective layer 11, is wound onto the roll body 1, the compression caused by the bonding of the membrane layers will cause the residual air between the membrane layers to migrate towards the channel of least resistance. At this time:

[0045] The first exhaust unit 4, located in the middle of the surface of the composite membrane layer 2, has micron-level exhaust holes with a diameter of 5-20 μm and a spacing of 5-10 cm. Because it penetrates the three membrane layers to form a "structured exhaust channel", it becomes the "preferred outlet" for air.

[0046] The air is squeezed through the micron-level exhaust holes during the winding of the pressure membrane layer, which is usually 0.1-0.5 bar. It enters the gap between the membrane layer and the main body 1 of the roll from the "closed space between membrane layers". During this process, the anti-clogging coating on the inner wall of the exhaust hole can prevent membrane material such as polyethylene debris and polypropylene melt from adhering and clogging, ensuring that the channel is unobstructed for a long time.

[0047] Air entering the gap between the membrane layer and the roll is "captured and directionally guided" by the spiral exhaust grooves of the second exhaust unit 5 on the surface of the roll body 1, which have a depth of 0.5-2mm, a width of 1-3mm, and a pitch of 20-80mm.

[0048] The spiral exhaust groove is precisely aligned with the first exhaust unit 4. Through size matching and position design, the exhaust hole naturally falls into the extension path of the spiral groove after winding. The air flows towards the end of the membrane roll along the spiral groove with the "circular motion + axial feed" of the membrane roll.

[0049] The smooth, wear-resistant layer on the inner wall of the groove, such as a polytetrafluoroethylene coating, can reduce the viscous resistance of airflow. Compared with the bare metal surface, the resistance is reduced by 30-50%, allowing air to migrate towards the end at a more stable flow rate and avoiding local air stagnation caused by uneven resistance.

[0050] After flowing along the spiral grooves to the end of the membrane roll, the air enters the annular air collection chamber of the third exhaust unit 6, which is 5-15mm wide and 3-8mm deep.

[0051] The annular air collection chamber is connected to the end of the spiral groove through a transition rounded corner, which can "converge" the air guided by multiple spiral grooves to form a local high-pressure zone;

[0052] The axial gap of 3-8mm and the radial gap of 2-5mm between the gas collection chamber and the two ends of the composite membrane layer and the sealing cover may cause a small amount of air leakage. However, because the air intake of the exhaust unit's "large flow intake" micron hole and spiral groove is much greater than the gap leakage, the pressure in the gas collection chamber will continue to rise.

[0053] When the pressure inside the annular gas collecting chamber rises to the opening pressure threshold of the one-way exhaust valve 7 (0.1-0.3 bar):

[0054] The valve core of the one-way exhaust valve 7 will overcome the preload force of the elastic reset member, as in Example 1, and the 0.2 bar pressure will push the valve core open and move upward axially to open the exhaust passage.

[0055] Air is discharged outside the diaphragm roll through the gap between the valve body and the valve core. During this process, the sealing gasket will undergo slight deformation due to the movement of the valve core, but it still maintains a "pre-seal" on the valve body to prevent a large amount of external air from seeping in.

[0056] After the exhaust is completed, the pressure in the annular gas collecting chamber decreases, and the valve core falls back to its original position under the action of elastic force, fitting tightly against the valve body;

[0057] The sealing gasket fills the gap between the valve core and the valve body, forming a reverse seal—even if the membrane roll is in a humid and dusty environment, external air cannot penetrate into the membrane layers through the one-way valve, ensuring the storage stability of the membrane layers. For example, food packaging films can avoid moisture, and electronic component packaging films can avoid dust contamination.

[0058] If the film roll experiences a sudden increase in internal pressure due to abnormal winding equipment, such as excessive winding speed, uneven tension, or drastic changes in ambient temperature, such as high temperature causing air expansion:

[0059] The axial gap of 3-8mm and the radial gap of 2-5mm between the composite membrane layer 2 and the sealing cap can act as a "safety valve" to allow some air to leak through the gap, thus preventing the membrane layer from rupturing due to excessive pressure.

[0060] However, due to the "high-flow intake channel" characteristic of the exhaust unit, the intake efficiency of the micron-sized holes and spiral grooves is much higher than that of gap leakage. The pressure in the gas collection chamber can still maintain the one-way valve opening, ensuring that the "main exhaust path" works first, and gap leakage is only "auxiliary pressure relief".

[0061] Furthermore, during production, there are manufacturing tolerances in the film thickness, roll diameter, and sealing cap dimensions, such as a total thickness of composite film layer 2 of ±0.1mm.

[0062] The clearance provides a "buffer space" for these tolerances, avoiding assembly difficulties caused by tolerance interference, such as the sealing cap not being able to fit into the roll or the sealing failure, such as the sealing ring 8 being overly squeezed into the film layer;

[0063] Even with tolerances, the structural design of the exhaust unit and one-way valve, such as the pitch adaptation of the spiral groove and the elastic seal of the one-way valve, can still ensure that the core functions of the exhaust system are not affected.

[0064] The above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A composite membrane roll with an easy-venting structure, comprising a roll body (1), a composite membrane layer (2), and an end sealing assembly (3), characterized in that: The surface of the composite membrane layer (2) is uniformly distributed with first exhaust units (4), the first exhaust units (4) are micron-sized exhaust holes that penetrate the composite membrane layer (2), and the exhaust holes are arranged in a single row at intervals along the length of the composite membrane layer (2). The outer surface of the main body (1) of the scroll is provided with a second exhaust unit (5), the second exhaust unit (5) is a spiral exhaust groove, the spiral exhaust groove is corresponding to the position of the first exhaust unit (4) and is connected to each other; The end sealing assembly (3) is provided with a third exhaust unit (6) inside. The third exhaust unit (6) is an annular gas collection chamber. The annular gas collection chamber is connected to the end of the second exhaust unit (5), and a one-way exhaust valve (7) is provided in the annular gas collection chamber.

2. The composite membrane roll with an easily vented structure according to claim 1, characterized in that: The first exhaust unit (4) has a micron-level exhaust hole diameter of 5-20μm, an adjacent exhaust hole spacing of 5-10cm, and an anti-clogging coating on the inner wall of the exhaust hole.

3. The composite membrane roll with an easily vented structure according to claim 1, characterized in that: The spiral exhaust groove of the second exhaust unit (5) has a depth of 0.5-2mm, a width of 1-3mm, a spiral angle of 30°-60°, and a smooth wear-resistant layer on the inner wall of the groove.

4. The composite membrane roll with an easily vented structure according to claim 1, characterized in that: The annular air collection chamber of the third exhaust unit (6) has a width of 5-15mm and a depth of 3-8mm, and the connection between the annular air collection chamber and the spiral exhaust groove is provided with a transition rounded corner.

5. The composite membrane roll with an easily vented structure according to claim 1, characterized in that: The one-way exhaust valve (7) includes a valve body, a valve core and an elastic reset element. The valve body is fixed in the annular gas collection chamber. The valve core is connected to the valve body through the elastic reset element. A sealing gasket is provided at the contact point between the valve core and the valve body. The opening pressure threshold of the one-way exhaust valve (7) is 0.1-0.3 bar.

6. The composite membrane roll with an easily vented structure according to claim 1, characterized in that: The composite membrane layer (2) includes a base layer (9), a functional layer (10) and a protective layer (11). The base layer (9) is made of polyethylene material with a thickness of 0.5-2 mm; the functional layer (10) is made of breathable membrane material with a thickness of 0.2-1 mm; the protective layer (11) is made of polypropylene material with a thickness of 0.2-1 mm; and the first exhaust unit (4) passes through the protective layer (11), the functional layer (10) and the base layer (9) in sequence. The total thickness of the composite membrane layer (2) is 1-4 mm.

7. The composite membrane roll with an easily vented structure according to claim 1, characterized in that: The end sealing assembly (3) includes a left sealing cover and a right sealing cover. The left sealing cover and the right sealing cover are respectively fitted on both ends of the roll body (1). The left sealing cover and the right sealing cover are provided with sealing rings (8) at the contact points with the roll body (1). The diameter of the sealing rings (8) is 0.5-2mm larger than that of the roll body (1). The axial gap between the end of the composite film layer (2) and the inner end face of the sealing cover is 3-8mm. The radial gap between the outer surface of the composite film layer (2) and the inner circular surface of the sealing cover is 2-5mm.

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