A vacuumless air extraction bag

Abstract

The utility model provides a kind of no-indentation air extraction bag, the no-indentation air extraction bag includes vacuum bag film and one-way air-permeable cloth, the vacuum bag film with the one-way air-permeable cloth are square strip, and the vacuum bag film one side surface two opposite long edge edges respectively with the one-way air-permeable cloth one side surface two opposite long edge edges are adhered to form accommodating space, at least one layer of air-permeable felt is provided in the accommodating space;The utility model uses at least one layer of air-permeable felt as air guide structure, the air-permeable felt itself soft texture, on the one hand will not damage one-way air-permeable cloth, on the other hand will not produce obvious indentation on the surface of workpiece in solidification process, more suitable for used in wind power blade infusion molding process.

Description

Technical Field

[0001] This utility model belongs to the field of composite material molding technology, specifically relating to a non-indented vacuum bag. Background Technology

[0002] Currently, vacuum bags are used to assist in the vacuuming process of wind turbine blades. Most vacuum bags currently used employ one or two layers of woven guide netting or one layer of extruded guide netting as the vacuuming structure. However, during the pressing and transportation of the vacuum bag, the guide netting may damage the one-way breathable fabric, causing resin to enter the vacuum bag during the filling process, affecting the vacuuming effect. Moreover, during the curing process, the guide netting will leave relatively obvious indentations on the surface of the part, affecting the appearance of the part after molding.

[0003] Therefore, in order to address the above-mentioned technical problems, it is essential to develop an indentation-free vacuum bag that will not damage the one-way breathable fabric and will not produce obvious indentations on the surface of the part during the curing process. Utility Model Content

[0004] To address the shortcomings of existing technologies, the purpose of this utility model is to provide a non-marking air extraction bag. The non-marking air extraction bag uses at least one layer of breathable felt as the air guiding structure. The breathable felt itself is soft and will not damage the one-way breathable fabric. Moreover, it will not produce obvious marks on the surface of the part during the curing process, and will not affect the appearance of the part after molding. It is suitable for use in the injection molding process of wind turbine blades.

[0005] To achieve the objective of this utility model, the following technical solution is adopted:

[0006] This utility model provides a pressure-free vacuum bag, which includes a vacuum bag film and a one-way breathable fabric. Both the vacuum bag film and the one-way breathable fabric are square strips. The two opposite long edges of one side surface of the vacuum bag film are respectively bonded to the two opposite long edges of one side surface of the one-way breathable fabric to form a receiving space. At least one layer of breathable felt is provided in the receiving space.

[0007] The indentation-free vacuum bag provided by this utility model uses at least one layer of breathable felt as the air guiding structure. Compared with the traditional vacuum bag with air guiding net as the air guiding structure, the breathable felt is soft in texture, so it will not damage the one-way breathable cloth. Moreover, it will not produce obvious indentations on the surface of the part during the curing process, and will not affect the appearance of the part after molding. Therefore, it is more suitable for use in the injection molding process of wind turbine blades.

[0008] This invention does not impose any special limitations on the preparation method of the provided indentation-free vacuum bag. For example, it can be prepared according to the following method:

[0009] First, a high-frequency heat sealer is used to bond the two opposite long edges of one side of the vacuum bag film to the two opposite long edges of one side of the unidirectional breathable fabric to form an accommodating space. Then, at least one layer of breathable felt is inserted between the vacuum bag film and the unidirectional breathable fabric. Finally, the two opposite short edges of one side of the vacuum bag film are selectively bonded to the two opposite short edges of one side of the unidirectional breathable fabric to obtain the indentation-free vacuum bag.

[0010] As a preferred technical solution of this utility model, the thickness of the vacuum bag film is 40-90μm, such as 40μm, 45μm, 50μm, 55μm, 60μm, 65μm, 70μm, 75μm, 80μm, 85μm or 90μm.

[0011] In this invention, the length and width of the vacuum bag film are not subject to special requirements and can be adjusted according to actual production needs to meet various requirements in actual production.

[0012] As a preferred technical solution of this utility model, the vacuum bag film is any one of polyamide vacuum bag film, polyethylene vacuum bag film or polypropylene vacuum bag film.

[0013] As a preferred technical solution of this utility model, the thickness of the unidirectional breathable fabric is 100-250μm, such as 100μm, 120μm, 140μm, 160μm, 180μm, 200μm, 220μm or 240μm.

[0014] Similarly, in this invention, there are no special requirements for the length and width of the unidirectional breathable fabric, which can be adjusted according to actual production needs to meet various requirements in actual production.

[0015] Furthermore, in this invention, the width of the vacuum bag film can be greater than, less than, or equal to the width of the unidirectional breathable fabric.

[0016] As a preferred technical solution of this utility model, the one-way breathable fabric includes a fabric surface layer and a PU coating, and the PU coating is disposed on the side surface close to the vacuum bag film.

[0017] As a preferred technical solution of this utility model, the fabric layer is any one of polypropylene fiber layer, polyester fiber layer or nylon fiber layer.

[0018] It should be noted that the aforementioned one-way breathable fabric, including the fabric surface layer and the PU coating, is an existing material that can be obtained directly by purchasing commercially available products or prepared using existing methods.

[0019] As a preferred technical solution of this utility model, the breathable felt is a polyester breathable felt or a nylon breathable felt.

[0020] As a preferred embodiment of this invention, the areal density of the breathable felt is 100–400 g / m³. 2 For example, 100g / m 2 150g / m 2 200g / m 2 250g / m 2 300g / m 2 350g / m 2 Or 400g / m 2 wait.

[0021] As a preferred technical solution of this utility model, the accommodating space is provided with 1 to 5 layers (e.g., 1, 2, 3, 4 or 5 layers, etc.) of breathable felt.

[0022] As a preferred technical solution of this utility model, the two opposite short edges of one side surface of the vacuum bag film are respectively bonded to the two opposite short edges of one side surface of the one-way breathable fabric, that is, the four edges of one side surface of the vacuum bag film are respectively bonded to the four edges of one side surface of the one-way breathable fabric, and the two form a sealed space.

[0023] As a preferred technical solution of this utility model, at least one opening is provided on each side of the non-indentation vacuum bag along its length, and each opening is connected to a vacuum ear for vacuuming.

[0024] It should be noted that when the indentation-free vacuum bag has an opening in the length direction and the opening is connected to a vacuum ear, the four edges of one side surface of the vacuum bag film need to be bonded to the four edges of one side surface of the one-way breathable fabric to form a sealed space.

[0025] As a preferred technical solution of this utility model, the air extraction ear is made of at least one layer of breathable felt inserted between two layers of vacuum bag film.

[0026] As a preferred technical solution of this utility model, the air extraction ear is made of 1 to 5 layers (e.g., 1, 2, 3, 4 or 5 layers) of breathable felt inserted between two layers of vacuum bag film.

[0027] In this invention, there is no special limitation on the connection method between the air extraction ear and the vacuum bag film. It can be bonded by a high-frequency heat sealing machine or by sealing tape.

[0028] Compared with the prior art, the present invention has the following beneficial effects:

[0029] The indentation-free vacuum bag provided by this utility model includes a vacuum bag film and a one-way breathable cloth. Both the vacuum bag film and the one-way breathable cloth are square strips. The two opposite long edges of one side surface of the vacuum bag film are respectively bonded to the two opposite long edges of one side surface of the one-way breathable cloth to form a receiving space. At least one layer of breathable felt is provided in the receiving space. Using at least one layer of breathable felt as the air guiding structure, compared with the traditional air guiding net as the air guiding structure, the breathable felt will not damage the one-way breathable cloth and will not produce obvious indentations on the surface of the part during the curing process, making it more suitable for use in the injection molding process of wind turbine blades. Attached Figure Description

[0030] Figure 1 A top view of the vacuum bag film provided in a specific embodiment of this utility model;

[0031] Figure 2 A top view of the unidirectional breathable fabric provided in a specific embodiment of this utility model;

[0032] Figure 3 A cross-sectional structural diagram of a non-indentation vacuum bag provided for a specific embodiment of this utility model;

[0033] Figure 4 A top view of the non-indentation vacuum bag provided in a specific embodiment of this utility model;

[0034] Among them, 1-vacuum bag film, 2-one-way breathable cloth, 3-breathable felt, 4-extraction ear. Detailed Implementation

[0035] The technical solution of this utility model will be further described below through specific embodiments. Those skilled in the art should understand that the embodiments described are merely illustrative of this utility model and should not be considered as specific limitations thereof.

[0036] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0037] In the description of this utility model, it should be understood that the directional descriptions, such as up, down, front, back, left, right, etc., indicate the directional or positional relationship based on the directional or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model 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. Therefore, they should not be construed as limitations on this utility model.

[0038] In the description of this utility model, it should be noted that all the raw materials involved are existing materials in the field, and can be prepared according to existing schemes or purchased from existing products.

[0039] In one specific embodiment, the present invention provides a pressure-free vacuum bag, such as... Figures 1-3 As shown (where, Figure 1 This is a top view of the vacuum bag film structure. Figure 2 This is a top view of the structure of a one-way breathable fabric. Figure 3 This is a cross-sectional structural diagram of a non-marking vacuum bag (arrow A indicates the length direction of the non-marking vacuum bag). The non-marking vacuum bag includes a vacuum bag film 1 and a one-way breathable fabric 2. Both the vacuum bag film 1 and the one-way breathable fabric 2 are square strips. The two opposite long edges of one side surface of the vacuum bag film 1 are respectively bonded to the two opposite long edges of one side surface of the one-way breathable fabric 2 to form an accommodating space. At least one layer of breathable felt 3 is provided in the accommodating space.

[0040] The indentation-free vacuum bag provided by this utility model uses at least one layer of breathable felt 3 as the air guiding structure. Since the breathable felt 3 itself is relatively soft, it will not damage the one-way breathable cloth 2, and will not produce obvious indentations on the surface of the part during the curing process, so that the molded part can maintain a good appearance.

[0041] Furthermore, the indentation-free vacuum bag provided in the above specific embodiments of this utility model has its width direction (perpendicular to) Figure 3 Openings can be left at both ends (in the direction indicated by the middle arrow A) for air extraction.

[0042] Furthermore, the thickness of the vacuum bag film 1 is 40–90 μm.

[0043] This invention does not impose special requirements on the length and width of the vacuum bag film 1, which can be adjusted according to actual production needs to meet various requirements in actual production.

[0044] Furthermore, the vacuum bag film 1 is any one of polyamide vacuum bag film, polyethylene vacuum bag film, or polypropylene vacuum bag film, and the vacuum bag films of the above materials are all existing products.

[0045] Furthermore, the thickness of the unidirectional breathable fabric 2 is 100–250 μm.

[0046] Similarly, this utility model does not impose special requirements on the length and width of the unidirectional breathable fabric 2, which can be adjusted according to actual production needs to meet various requirements in actual production.

[0047] Furthermore, in the above-described specific embodiments of this utility model, the width of the vacuum bag film 1 can be greater than, less than, or equal to the width of the unidirectional breathable fabric 2.

[0048] Furthermore, the one-way breathable fabric 2 includes a fabric surface layer and a PU coating, and the PU coating is disposed on the side surface close to the vacuum bag film 1.

[0049] Furthermore, the fabric layer is any one of a polypropylene fiber layer, a polyester fiber layer, or a nylon fiber layer.

[0050] In the above specific embodiments of this utility model, the unidirectional breathable fabric 2, which includes a fabric surface layer and a PU coating, is an existing material that can be obtained directly by purchasing commercially available products or prepared according to existing methods.

[0051] Furthermore, the breathable felt 3 is a polyester breathable felt or a nylon breathable felt, which are also existing products.

[0052] Furthermore, the areal density of the breathable felt 3 is 100–400 g / m³. 2 .

[0053] Furthermore, the accommodating space is provided with 1 to 5 layers of breathable felt 3.

[0054] Furthermore, the two opposite short edges of one side surface of the vacuum bag film 1 are respectively bonded to the two opposite short edges of one side surface of the unidirectional breathable fabric 2.

[0055] Furthermore, such as Figure 4 As shown, along the length of the indentation-free vacuum bag ( Figure 4 At least one opening is provided on each side of the arrow (in the direction indicated by arrow A), and each opening is connected to an air extraction ear 4 for air extraction.

[0056] It should be noted that, in the above specific embodiments of this utility model, when the non-indentation vacuum bag has an opening in the length direction and the opening is connected to the vacuum ear 4 for vacuuming, the four edges of one side surface of the vacuum bag film 1 need to be bonded to the four edges of one side surface of the one-way breathable cloth 2 respectively, thus forming a sealed space.

[0057] Furthermore, the suction ear 4 and the pressure-free suction bag are in the same plane.

[0058] In this utility model, there is no special limitation on the connection method between the suction ear 4 and the indentation-free suction bag. For example, the suction ear 4 and the indentation-free suction bag can be bonded by a high-frequency heat sealing machine or by sealing tape.

[0059] Furthermore, the vacuum ear 4 is made of at least one layer of breathable felt inserted between two layers of vacuum bag film.

[0060] Furthermore, the air extraction ear is made of at least 1 to 5 layers (e.g., 1, 2, 3, 4 or 5 layers) of breathable felt 3 between two layers of vacuum bag film.

[0061] This utility model does not specifically limit the preparation method of the indentation-free vacuum bag provided in the above specific embodiments. In order to more intuitively demonstrate the structure of the indentation-free vacuum bag provided by this utility model, it is exemplarily prepared according to the following method:

[0062] (1) First, a high-frequency heat sealing machine is used to bond the vacuum bag film 1 and the one-way breathable cloth 2 together. The bonding points are the two opposite long edges of one side surface of the vacuum bag film 1 and the two opposite long edges of one side surface of the one-way breathable cloth 2 covered with PU coating.

[0063] (2. Insert at least one layer of breathable felt 3 between the vacuum bag film 1 and the one-way breathable cloth 2;

[0064] (3) A high-frequency heat sealer is used to bond the vacuum bag film 1 and the one-way breathable cloth 2 for the second time. The bonding points are the two opposite short edges of one side surface of the vacuum bag film 1 and the two opposite short edges of one side surface of the one-way breathable cloth 2 covered with PU coating.

[0065] (4) Make openings on both sides of the length of the indentation-free vacuum bag, and use a high-frequency heat sealer to bond the vacuum ears 4 at the openings to obtain the indentation-free vacuum bag.

[0066] To more intuitively demonstrate the technical effects of the pressure-free vacuum bag provided by this utility model, the following explanation is based on specific implementation cases and data.

[0067] Example 1

[0068] This embodiment provides a non-marking vacuum bag, which includes a vacuum bag film and a one-way breathable fabric.

[0069] The vacuum bag film is a square strip of polyethylene film with a thickness of 65μm, a length of 10000mm, and a width of 250mm.

[0070] The unidirectional breathable fabric has a thickness of 150μm, a length of 10000mm, and a width of 250mm. It includes square strips of PA6 nylon fabric, and a PU coating is applied to the surface of the PA6 nylon fabric on the side closest to the vacuum bag film.

[0071] The two opposite long edges of one side surface of the vacuum bag film are bonded to the two opposite long edges of one side surface of the one-way breathable fabric, and the two opposite short edges of one side surface of the vacuum bag film are bonded to the two opposite short edges of one side surface of the one-way breathable fabric, forming an accommodating space, and a layer of polyester breathable felt is provided in the accommodating space.

[0072] The areal density of the polyester breathable felt is 330 g / m². 2 It has a thickness of 6mm, a length of 9900mm, and a width of 210mm.

[0073] When the indentation-free vacuum bag provided in Example 1 is used in the wind turbine blade injection process, the polyester breathable felt will not damage the unidirectional breathable fabric, and no obvious indentations are generated on the surface of the part during the curing process, resulting in a good appearance of the part.

[0074] Example 2

[0075] This embodiment provides a non-marking vacuum bag, which includes a vacuum bag film and a one-way breathable fabric.

[0076] The vacuum bag film is a square strip of polypropylene film with a thickness of 75 μm, a length of 20000 mm, and a width of 300 mm.

[0077] The unidirectional breathable fabric has a thickness of 135μm, a length of 20000mm, and a width of 300mm. It includes square strips of PA6 nylon fabric, and a PU coating is applied to the surface of the PA6 nylon fabric on the side closest to the vacuum bag film.

[0078] The two opposite long edges of one side surface of the vacuum bag film are bonded to the two opposite long edges of one side surface of the unidirectional breathable fabric, forming an accommodating space, in which three layers of polyester breathable felt are provided.

[0079] The areal density of the polyester breathable felt is 135 g / m². 2 It has a thickness of 2mm, a length of 19900mm, and a width of 260mm.

[0080] When the indentation-free vacuum bag provided in Example 2 is used in the wind turbine blade injection process, the polyester breathable felt will not damage the unidirectional breathable cloth, and no obvious indentations will be generated on the surface of the part during the curing process, resulting in a good appearance of the part.

[0081] Example 3

[0082] This embodiment provides a non-marking vacuum bag, which includes a vacuum bag film and a one-way breathable fabric.

[0083] The vacuum bag film is a square strip of polyamide film with a thickness of 70 μm, a length of 15000 mm, and a width of 350 mm.

[0084] The unidirectional breathable fabric has a thickness of 230μm, a length of 15000mm, and a width of 350mm. It consists of square strips of PA6 nylon fabric, and a PU coating is applied to the surface of the PA6 nylon fabric on the side closest to the vacuum bag film.

[0085] The two opposite long edges of one side surface of the vacuum bag film are bonded to the two opposite long edges of one side surface of the one-way breathable fabric, and the two opposite short edges of one side surface of the vacuum bag film are bonded to the two opposite short edges of one side surface of the one-way breathable fabric, forming an accommodating space, and a layer of nylon breathable felt is provided in the accommodating space.

[0086] The areal density of the nylon breathable felt is 300 g / m³. 2 It has a thickness of 5mm, a length of 14900mm, and a width of 310mm;

[0087] Furthermore, an opening is provided on each side of the length direction of the non-indentation air extraction bag, and the two openings are respectively connected to two air extraction ears for air extraction. The air extraction ears are made of two layers of polyamide film on the top and bottom, with three layers of nylon breathable felt in the middle.

[0088] When the indentation-free vacuum bag provided in Example 3 is used in the wind turbine blade injection process, the nylon breathable felt will not damage the one-way breathable cloth, and no obvious indentations will be generated on the surface of the part during the curing process, resulting in a good appearance of the part.

[0089] The applicant declares that this utility model describes a pressure-free vacuum bag through the above specific embodiments, but this utility model is not limited to the above specific embodiments, that is, it does not mean that this utility model must rely on the above specific embodiments to be implemented.

Claims

1. A pressure-free vacuum bag, characterized in that, The pressure-free vacuum bag includes a vacuum bag film and a one-way breathable fabric. Both the vacuum bag film and the one-way breathable fabric are square strips. The two opposite long edges of one side surface of the vacuum bag film are respectively bonded to the two opposite long edges of one side surface of the one-way breathable fabric to form a receiving space. At least one layer of breathable felt is provided in the receiving space.

2. The indentation-free vacuum bag according to claim 1, characterized in that, The thickness of the vacuum bag film is 40–90 μm.

3. The indentation-free vacuum bag according to claim 1, characterized in that, The thickness of the unidirectional breathable fabric is 100–250 μm.

4. The indentation-free vacuum bag according to claim 1 or 3, characterized in that, The one-way breathable fabric includes a fabric surface layer and a PU coating, and the PU coating is disposed on the side close to the vacuum bag film.

5. The indentation-free vacuum bag according to claim 1, characterized in that, The breathable felt is a polyester breathable felt or a nylon breathable felt.

6. The indentation-free vacuum bag according to claim 1 or 5, characterized in that, The air permeable batt has a face density of 100 to 400 g / m 2 .

7. The indentation-free vacuum bag according to claim 1, characterized in that, The containment space is equipped with 1 to 5 layers of breathable felt.

8. The indentation-free vacuum bag according to claim 1, characterized in that, The two opposite short edges of one side surface of the vacuum bag film are respectively bonded to the two opposite short edges of one side surface of the one-way breathable fabric.

9. The indentation-free vacuum bag according to claim 8, characterized in that, At least one opening is provided on each side along the length of the non-indentation vacuum bag, and each opening is connected to a vacuum ear for vacuuming.

10. The indentation-free vacuum bag according to claim 9, characterized in that, The air extraction ear is made of two layers of vacuum bag film with at least one layer of breathable felt inserted in between.

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