What is curing process in composites?
The process of curing of composite resins occurs in three main phases: pre-gel, gel point and post-gel. During this phase, there is a predominance of linear polymer chains. Thereafter, the resin passes from the flow state (pre-gel) to the viscous state (post-gel), which establishes its gel point.
What is autoclave curing in concrete?
Autoclave curing is a technique in which concrete cured with high pressure and temperature in sealed vessel. Limited research findings were reported on autoclave curing compare to other types of accelerated curing process. Review of literatures indicates that autoclave curing is mostly used for aerated concrete.
What is a cure cycle?
The time/temperature/pressure cycle used to cure a thermosetting resin system of prepreg.
What is an autoclave used for in composites?
In composite technology, autoclaves are pressure vessels used to process parts and materials which require exposure to elevated pressure and temperature for the curing. The pressure is necessary to reach a sufficient level of fiber content and to reduce the residual porosity in the composites.
What are the types of curing?
Methods of Curing Concrete
- Water Curing.
- Wet Covering.
- Formwork Curing.
- Membrane Curing.
- Sheet Curing.
- Curing by Absorbing Heat.
- Hot mixing method.
- Electrical curing.
Why curing is done?
Curing plays an important role on strength development and durability of concrete. Curing takes place immediately after concrete placing and finishing, and involves maintenance of desired moisture and temperature conditions, both at depth and near the surface, for extended periods of time.
What is curing time for glue?
Hide Glue
| Type of Glue | Average Drying Time | Average Curing Time |
|---|---|---|
| Polyurethane Glue | 1 – 2 hours | 24 hours |
| Epoxy | 30 minutes – 1 hour | 12 – 74 hours |
| Cyanoacrylate | 10 seconds – 10 minutes | 24 hours |
| Hide | 1 – 3 hours | 12 – 24 hours |
What is autoclave process?
Autoclaving is a sterilization method that uses high-pressure steam. The autoclaving process works by the concept that the boiling point of water (or steam) increases when it is under pressure. History of the Autoclave.
What is the principle of the autoclave?
moist heat sterilisation
An autoclave is a device that works on the principle of moist heat sterilisation, wherein saturated steam is generated under pressure in order to kill microorganisms such as bacteria, viruses, and even heat-resistant endospores from various types of instruments.
Which curing method is best?
Ponding Method This is the best method of curing. It is suitable for curing horizontal surfaces such as floors, roof slabs, road and air field pavements. The horizontal top surfaces of beams can also be ponded.
How are autoclaves used in the composite industry?
Autoclave curing is the most widely used method producing high quality composite laminate’s in the composite industry. Autoclaves are used in several industries to help in the manufacturing of polymeric composites. Although the process of autoclaving can be used in several industries, it is often used in aviation.
How are temperature and pressure controlled in autoclave?
In the case of thermoset pre-pegs, high temperatures will be used in the initial and final staged of the autoclaving process. The pressure and temperature in these machines are controlled separately, hence are independent of one another.
Why is heat and pressure used in autoclaving?
The process of autoclaving allows autoclave manufacturers and their customers to produce materials of the highest quality. The heat and pressure in an autoclave is used to a variety of products, helping in improving the overall quality and strength of these products.