A Method for Detecting Air Leakage Points of Multilayer Vacuum Bag Films Using Oxygen Sensitive Substances

An oxygen-sensitive, vacuum bag technology, applied in the direction of detecting the appearance of fluid at the leak point, using liquid/vacuum degree for liquid tightness measurement, etc., can solve the problem of not being able to accurately find the leak point of the vacuum bag film, and achieve overall The length of the process and the difficulty of process control are moderate, saving manpower and material resources, and ensuring the effect of molding pressure

Active Publication Date: 2020-06-12
DONGHUA UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The purpose of the present invention is to overcome the shortcomings of the prior art that the air leakage point of the vacuum bag film cannot be accurately found, and to provide a method for detecting the air leakage point of the multilayer vacuum bag film by using an oxygen-sensitive substance. Once the vacuum bag film leaks, the oxygen in the air entering the vacuum bag film layer will react with the sensitive substance, and the sensitive substance will undergo a color change that can be observed by the naked eye, realizing the vacuum bag Membrane air leak self-test

Method used

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  • A Method for Detecting Air Leakage Points of Multilayer Vacuum Bag Films Using Oxygen Sensitive Substances
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  • A Method for Detecting Air Leakage Points of Multilayer Vacuum Bag Films Using Oxygen Sensitive Substances

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Embodiment 1

[0026] A method for detecting the air leakage point of a three-layer vacuum bag film by using an oxygen-sensitive substance. Under the condition of filling inert gas nitrogen protection, the catechol compound and the pellets of the vacuum bag film are first melted and blended to obtain pellets. Then, the pellets of the vacuum bag film and the pellets obtained by melt blending are co-extruded in three layers, so that the catechol compounds that will change color after encountering air are evenly dispersed in the three-layer vacuum bag film. The second layer, then put the three-layer vacuum bag film in the air, observe the vacuum bag film, the point where the observed color changes is the air leakage point, the color change is within the range visible to the naked eye, from colorless to pink, Turn into black at last, and wherein the second layer of vacuum bag film is the interlayer of thickness 10 μ m, and the content in the catechol compound in the interlayer is 0.1wt%, and ther...

Embodiment 2

[0030] A method for detecting the air leakage point of a five-layer vacuum bag film by using an oxygen-sensitive substance. Under the condition of filling inert gas argon for protection, the catechol compound and the pellets of the vacuum bag film are firstly melted and blended to obtain Granules, and then five-layer co-extrusion composite of the pellets of the vacuum bag film and the pellets obtained by melt blending, so that the catechol compounds that will change color after encountering air are evenly dispersed in the five-layer vacuum bag film Then put the five-layer vacuum bag film in the air, observe the vacuum bag film, the point where the observed color changes is the air leakage point, and the color change is within the range visible to the naked eye, from colorless to pink , and finally turn black, wherein the third layer of the vacuum bag film is an interlayer with a thickness of 30 μm, and the content of catechol compounds in the interlayer is 10wt%, and there is a...

Embodiment 3

[0034] A method for detecting the air leakage point of a four-layer vacuum bag film by using oxygen-sensitive substances. Under the condition of filling inert gas helium protection, the catechol compound and the pellets of the vacuum bag film are first melted and blended to obtain Granules, and then four-layer co-extrusion compounding of the pellets of the vacuum bag film and the pellets obtained by melt blending, so that the catechol compounds that will change color after encountering air are evenly dispersed in the four-layer vacuum bag film The second and third layers, and then put the four-layer vacuum bag film in the air, observe the vacuum bag film, the point where the observed color changes is the air leakage point, and the color change is within the range visible to the naked eye. The color turns pink and finally black, wherein the second and third layers of the vacuum bag film are interlayers with a thickness of 20 μm, and the content of catechol compounds in the inter...

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Abstract

The invention relates to a method of detecting the multilayer vacuum bag film leakage point by means of an oxygen-sensitive substance. The oxygen-sensitive substance is added to the intermediate layer of a multilayer vacuum bag film and the oxygen-sensitive substance is maintained in an non-oxidative state, and then the multilayer vacuum bag film is placed in the air, the point with color change under the observation is the leakage point, the oxygen-sensitive substance changes color as meeting the air, the color change is visible to naked eye, the layers of the multilayer vacuum bag film are equal to and greater than 3, and the intermediate layer is any one or more interlayers between the inner surface layer and the outer surface layer of the vacuum bag film. The method can automatically detect its own air tightness based on the external oxygen concentration change of the vacuum bag film, accurately and quickly find out the place of leakage, and timely take remedial measures, and guarantees the moulding pressure of a composite material member, thereby saving the production cost, improving the production efficiency, and having the advantage of industrialized popularization.

Description

technical field [0001] The invention belongs to the field of air tightness detection of vacuum bag films, and relates to a method for detecting air leakage points of multilayer vacuum bag films by using oxygen-sensitive substances. Background technique [0002] With the increasing demand for composite material components in aerospace, ships, trains and other fields, the performance requirements of the auxiliary materials used in the forming process are also higher. Vacuum bag film is a kind of vacuum auxiliary material for the preparation of composite material components by autoclave forming or vacuum assisted forming. It provides a vacuum-tight environment for the composite material together with the sealing tape, and the components are compacted by vacuuming to ensure the forming pressure. However, in the production process of vacuum bag film, trachoma is easy to appear, and trachoma cannot be observed with the naked eye. Composite components have internal quality defect...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01M3/20
CPCG01M3/20
Inventor 胡秀凤胡仲杰胡潇潘利剑刘卫平
Owner DONGHUA UNIV
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