Printed Circuit Board Copper Clad Laminate Problems and Solutions

First, we must be able to search for

It is impossible to manufacture any number of PCBs without encountering problems, which is mainly attributable to the PCB copper clad laminate material. When quality problems occur in the actual manufacturing process, it often appears that the PCB substrate material is the cause of the problem. Even a technical specification for PCB laminates that has been carefully written and implemented in practice does not stipulate the test items that must be conducted to determine the cause of problems in the production process for PCB laminates. Here are some of the most commonly encountered PCB laminate problems and how to confirm them.

Once PCB laminate problems are encountered, consideration should be given to adding to the PCB laminate specifications. Usually, if this technical specification is not carried out, it will cause constant quality changes, and it will lead to product obsolescence.

In general, the material problems that arise due to changes in the quality of PCB laminates occur in the different batches of raw materials used by the manufacturer or products that are manufactured using different pressing loads. Few users can hold large enough records to be able to distinguish specific press loads or batches of materials at the processing site. As a result, it is often the case that PCBs are constantly produced and loaded with components, and that warpage is continuously generated in the solder bath, thereby wasting a lot of labor and expensive components.

If the batch number can be immediately checked, the manufacturer of the PCB laminate can check the batch number of the resin, the batch number of the copper foil, and the curing cycle. That is, if the user cannot provide continuity with the PCB laminate manufacturer's quality control system, this will cause the user himself to suffer long-term losses. The following describes the general issues related to substrate materials in the PCB manufacturing process.

Second, the surface problem

Symptoms: poor adhesion of the print, poor adhesion of the coating, some parts that cannot be etched away, and some parts that cannot be soldered.

Inspection methods that can be used: Visual inspections are usually performed with visible watermarks on the surface of the board:

possible reason:

Because of the very dense and smooth surface caused by the release film, the uncoated copper surface is excessively bright. Normally on the uncoated side of the laminate, the laminate maker did not remove the release agent. The pinholes in the copper foil cause the resin to flow out and accumulate on the surface of the copper foil, which usually occurs on copper foils that are thinner than 3/4 oz. Copper foil manufacturers apply excess antioxidants on the surface of the copper foil. The laminate maker changed the resin system, stripped thin, or brushed. Due to improper operation, there are many fingerprints or oil stains. Apply oil to the punching, cutting, or drilling operations.

Possible solutions:

Laminate makers are advised to use fabric-like films or other release materials. Contact the laminate manufacturer using mechanical or chemical elimination methods. Contact the laminate manufacturer to inspect each batch of unacceptable copper foil; request a recommended solution to remove the resin. Ask the laminate maker for removal. Changtong recommends the use of hydrochloric acid, followed by removal by mechanical brushing. Before making any changes to the laminate manufacturing, cooperate with the laminate manufacturer and specify the user's test items.

Persons who educate all processes wear gloves to take the CCL. Find out whether the laminate is properly packed or packed in bags during transport, and the paper contains low levels of sulphur and the package is free from dirt. Take care to ensure that no one is touching the silicone-containing detergent. Copper foil is degreasing all laminates prior to plating or pattern transfer.

Promotional Caps/Hats

Promotional Caps,Trucker Caps,Baseball Caps

Promotional Pen,Promotional Cups/Mugs,Promotional Pens Co., Ltd. , http://www.nspromotionalpen.com

Posted on