Rush PCB Inc. uses prepregs and laminates for fabricating their printed circuit boards. The people that manufacture these materials have many fiberglass fabric styles which they offer. Rush PCB Inc. selects the materials based on the thickness which the PCB or finished laminate will take.
Furthermore, the quantity of resin necessary for bonding and filling is another factor that they consider. Apart from the thickness, there are other secondary properties like stiffness, costs, CTE control, and dielectric constant, which also determine the specific choice.
Processes involved in the Construction.
The first step in the construction of Fiberglass boards starts from the warp beams. These beams are made up of thousands of single strands of yarn rolled around the main shaft. The thread determines the machine route which the fabric will follow.
The next step is to cut the warp yarns or pass them through lubricants solutions or sizing agents to prevent them from being damaged during weaving.
It then goes through the weaving process, which commences when the warp beam is mounted on the loom’s back. The fill yarns are put in as the warp yarns go through from behind the loom through to the front. Formerly, the looms used were draper looms that use the wooden shuttle to fill the threads but recently, new looms are used. These new looms operate on a water jet or air, enabling the plane to carry the fill yarn over to the loom. With these newly upgraded looms, you can get a thousand meters of warped rope in just a single beam. This will enable you to produce as much as one single loom can have in one week.
The final step is to scour the electric graded glasses with a thorough water rinse. This will help to clean out the excessive sizing caused by warp yarns.
The finishing on the Fiberglass fabric indeed results in a bit of material: the important thing is how the resin wets the surface during the pre-pegging process.