Composite by Hand Lay-up Process

-

What are composites ?

A composite is a material made from two or more different materials with different physical or chemical properties that, when combined, are stronger than those individual materials by themselves

composites are used from ancient period of time like bricks, mud, straw, etc.

Now question is arise that how to make composite, what was its methods or process???

The process which is use for making composites are known as molding, These are of three types:-

Open Molding
Closed Molding
Cast Polymers Molding

Each process have there own benefits

Now,We can study go through Each process in this blog we'll study about Hand Lay-up process which is a part of open molding:

Open Molding

In open molding process, Raw material like Resins and Fiber Reinforcement are exposed in air for cure and harden. It go through by different of process like Hand Lay-up, Spray-Up, Casting and Filament Winding

Hand Lay-up Process


Hand lay-up is an open molding method suitable for making a wide variety of composites products from very small to very large. Hand lay-up is the most common and least expensive open-molding method because it requires the least amount of equipment. In this method Fiber reinforcements are placed by hand in a mold after that resin is applied with the help of brush or roller. it is feasible to produce substantial production quantities using multiple molds.  




Hand lay-up is the simplest composites molding method, offering low cost tooling, simple processing, and a wide range of part sizes. There is a minimum investment in equipment. And they give good production rates and consistent quality is obtainable.

This process is used to make both large and small items, including boats, storage tanks, tubs and showers.

 Process



Firstly we applied Gel coat with the help of spray gun for better quality surface. When the gel coat has applied properly, roll stock fiberglass reinforcement is manually placed on the mold. The laminating resin is applied by brushing, spray or paint roller. Paint rollers are used to consolidate the laminate, thoroughly wetting the reinforcement and removing entrapped air. Different  layers of fiberglass reinforcement are added to build laminate thickness. Low density core materials used to stiffen the laminate.

  Molds:

Simple, Single cavity molds of fiberglass composites construction are generally used. or low cost mold used.
                                                                        Spray-Up Process ⇨ 

                                          

Comments

Post a Comment

Popular posts from this blog

Composite by Filament Winding

-
Image
Filament Winding Filament winding is an automated open molding process that uses a rotating mandrel as the mold. The male mold configuration produces a finished inner surface and a laminate surface on the outside diameter of the product. Filament winding results in a high degree of fiber loading, which provides high tensile strengths in the manufacture of hollow, generally cylindrical products such as chemical and fuel storage tanks, pipes, stacks, pressure vessels, and rocket motor cases. The process makes the high strength-to-weight ratio laminates and provides a high degree of control over uniformity and fiber orientation. The filament winding process can be used to make structures which are highly engineered and meet strict tolerances. Because filament winding is automated, the labor factor for filament winding is lower than other open molding processes. Process Continuous strand roving is fed through a resin bath and wound onto a rotating mandrel. The ro
Read more

Composite by Spray-Up Process

-
Image
Spray-Up Process Spray-up also known as chopping, is an open mold method similar to hand lay-up in its Used for making boats, tanks, transportation components, & tub/shower units in a large shapes and sizes. A chopped laminate has good conformability so, sometimes faster to produce than a part made with hand lay-up when molding complex shapes.  In the spray-up process the operator controls thickness and consistency, therefore the process is more operator dependent than hand lay-up. Although production volume per mold is low, it is feasible to produce substantial production quantities using multiple molds Process   As with hand lay-up, gel coat is first applied to the mold prior to spray-up of the substrate laminate. Continuous strand glass roving and begin resin are fed through a chopper gun, which deposits the resin-saturated "chop" on the mold. The laminate is then rolled to thoroughly saturate the glass strands and compact the chop. Additional lay
Read more