Jul 13th 2021
In Part 3 we begin to look at application and use, including Surface & Envelope Bagging. We also take a look at several Airtech Bagging Materials, a giant in the industry when it comes to bagging material.
Vacuum Bagging Film selection is also dependent on the application of method onto the tooling surface. The two main application methods are surface bagging and envelope bagging. Though there are additional ways to back a part, these two methods cover 99% of general bagging arrangements. Usually the tool configuration will be the best guide in deciding the technique to use.
Surface bagging is the most used type of bagging application in the composite industry. The bagging film is placed and sealed on top of the mold surface. Usually the layup tools are designed around the process of surface bagging part as flanges are made past the part’s layup lines on the tool to offer areas for “presstite” to stick to the bagging surface and tool. Any of the bagging films may work for this application based on the criteria of the part needs.
Envelope bagging is used to completely seal the mold and part. The bag is two sided and flat, although when expanded it forms a tube to go over the tool and part surface. This is often the easiest bagging type to achieve, especially with lighter and/or smaller tools as there is not as much pleating and sealant tape involved. Composite Envisions provides this bagging film in Airtech’s Ipplon KM1300 LFT. Envelope bagging is a great option for any product that will fit into the bag.
Bag & Breather 2 for 1
Certain bagging films are also designed to act as a complete system rather than just a film. Airtech’s Airdraw 2 removes the need for a breather material between the layup and the bagging film. This embossed film will cut costs in using breather and simplify composite processing all while providing air passageways for producing full vacuum pressures faster.
Airtech Bagging Materials
Airtech is the world’s leading supplier of composites bagging material and has the widest selection of bagging types for composite application. Though they have a huge selection in terms of bagging films, Airtech provides a category in which it was designed.
Securlon bagging films are made for commercial grade parts for utmost quality purposes when used in high temperature cures where high elongation and strength are of the highest concern. These films are multi layered in composition and provide the safest option in bagging films.
Stretchlon bagging films are nearly self-described in the name of stretching. Some Stretchlon films will elongate to 500%! The Stretchlon line offers this high stretch for differing temperature applications, resin types, and budgets. Stretchlon will aid in bridging the gap of inexperience and producing high-quality laminates in almost any layup scenario.
Wrightlon films are Airtech’s original nylon film. It has been used and tested more than any other bagging film type to date. It is a proven product line that is still used to this day.
Ipplon bagging films are an extension of the Wrightlon bagging films, adding versatility in strength and softness for a higher degree of workability for elevated and pressurized cure cycles.
Econoline Bagging films offer a secure nylon film for room temperature cures and are often used for debulking within a part’s layup scheme. The Econoline is Airtech’s budget minded line that will produce high quality laminates the same as any other line available.
Ultra-High Temperature Films are specialty films designed to produce parts in cure cycles up to 750 F while keeping decent elongation figures.