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

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...

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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

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