Red Glue role is to make the parts tightly paste on the PCB surface, prevent them from falling, but in drawing occurs when using, the glue will fall and in other parts of the PCB components, most notably affect the appearance of the PCB, the serious influence to the use of electronic products, wire drawing is a variety of factors, process, and material, have glue, environmental aspects and so on, here are some patch red plastic factors and solving method of drawing.
1. Fast gluing speed
An appropriate patch glue has its fixed performance indicators, such as viscosity and thixotropic index, etc., to meet the demand of production technology of a fixed, but some users, the performance without knowing the glue in order to improve the production efficiency, increase the speed of dispensing, ignoring the product itself performance can't satisfy the needs of the new process, the sudden acceleration in dispensing, thixotropy couldn't keep up with, is easy to bring up the glue, appear wiredrawing phenomenon, the solution is the need to speed up the production efficiency change process before consulting the manufacturer, to determine whether the product performance can meet the new craft, can't meet, may require manufacturers to provide solutions, Prevent exceptions from occurring.
2. It was not stirred evenly before use
Patch red plastic as we all know it is to belong to high thixotropy material, the purpose is to solve the production of wire drawing phenomenon, but the reaction of thixotropy is the thixotropic index, the size of the thixotropic index and viscosity has a certain relationship, in the printing process or dispensing, randomness or probabilistic wiredrawing phenomenon, can consider to glue appear uneven local viscosity, lead to local, thixotropy at that point can be red with glue, mix in continue to use.
3. Printing screen problems
Using process is generally patch red plastic printing and dispensing, now say is printing network problems, first of all, to understand choose printing materials, such as metal, plastic, metal printing net is usually steel mesh, copper mesh, if printing hole is not smooth, no polishing, in the printing process can produce wire drawing, choose to use plastic printing network, be about to choose appropriate patch red plastic, because some red glue formula is not suitable for use on plastic material, and then mention the purity of the printing net is also one of the reasons, so understand printing network requirements, also can avoid the production of wire drawing.
4. Storage environment
The storage environment problem is that the performance and quality of patch red adhesive change due to some reasons. For example, the storage environment is inconsistent. The general storage requirement is low-temperature storage. Too much humidity in the storage environment and poor sealing will lead to moisture absorption or too fast moisture absorption of the glue itself, which will lead to the collapse of the red glue and also lead to wire drawing during use. Therefore, the storage environment of red glue should be kept dry at a low temperature to prevent the quality change of the glue caused by external influences.