Causes of yellowing in the use of circular touch switch
Release time：2018-09-03 Clicks： Click
What happens when a circular touch switch is yellow when it is used? Let me introduce below.
Round light touch switch is widely used in life, and many manufacturers, some guests will reflect, light touch switch in the furnace or after reflow soldering why will turn yellow, we will do some details on this issue.
Will cause the circular light touch switch to turn yellow after reflow welding mostly uses 6T plastic material, because 6T plastic material itself absorbs water relatively simply, if the plastic absorbs less water contrast, the estimation button after heating change is not very significant, but if absorbs more water than the color is very obvious, but right The key button itself function and the number of lives will not affect, because the change is just the color of the button's appearance.
Many customers mistakenly assume that the button is not heat-resistant, which is not true. If it is not heat-resistant, the performance of the plastic base will be deformed or plastic base melting and deformed fragments and other symptoms.
If the customer is still worried that such a situation will affect the quality of the light touch switch, the customer is advised to choose LCP material.
Because the LCP material is relatively brittle, it is difficult to absorb moisture so that after reflow soldering, it will not touch the switch to discolor this phenomenon.
Because of its small size, long life, light touch and so on, it has been widely used in many fields, such as household appliances. With the continuous improvement of people's living standards, the replacement of these household appliances is becoming faster and faster, and the number of appliances it needs will become larger and larger. This is also the greatest potential for our optimistic development prospects. Force direction.
Common problems of surface-mounted light-touch switch include but are not limited to hand feeling, adhesion, cover shedding, light pressing is not conducting, resistance value is on the high side, after the furnace press is not moving, the following detailed analysis of these common problems of light-touch switch, the specific content is as follows:
One of the common problems of surface mount type light touch switch is hand feeling.
A large number of customers have been responding, many suppliers sent samples feel is very consistent, but to mass production feel is not the same, in fact, this problem is very common, we all know that the switch feel and button force are controlled by shrapnel, we often say shrapnel is divided into phosphorus-copper shrapnel And stainless steel shrapnel, the vast majority of manufacturers in order to save costs touch switch is basically the use of phosphorus-copper shrapnel, because the price of phosphorus-copper shrapnel is relatively high, which is widely used, but phosphorus-copper shrapnel after the furnace temperature will be changed, shrinkage is more serious, which leads to poor feel, use Stainless steel shrapnel will not have this problem, but the cost of stainless steel shrapnel is relatively high, resulting in many manufacturers take the risk of choosing phosphorus copper shrapnel, so in the purchase of light touch switch must ask the next question.
Common problems of surface mount type light touch switch two, adhesion.
Ultra-thin light-touch switches are generally called membrane switches, thin switches need film cooperation, so as to achieve true thin, but a lot of thin film temperature resistance is not good, after the furnace will fall off phenomenon, our professional terminology said adhesion, in fact, is the film viscosity, imported PI film very good control of this point, it The adhesion is 400g, very in line with the use of switches, how often will fall off too light, if too heavy switch will not move, many manufacturers in order to save costs to choose cheap domestic PI film, touch the switch is very easy to appear adhesion problems, we suggest that before buying a good inquiry manufacturers, with a point touch switch is also So, if the imported rubber points out is very easy to fall off, if you use home-made then your problem will come, a penny a piece of goods, we recommend that you choose a high quality manufacturers, to their choice of a satisfactory manufacturer.
Common problems of surface mount type light touch switch three, the lid is off.
In the production process, will encounter a customer reaction switch cover will leak phenomenon, a good switch cover how to fall off? First of all, we need to understand the switch structure, the switch cover is on the back cover, this is the same production process for thousands of years, familiar with people will find that the lid is on the base above If the four riveting points are fixed, then the four riveting points should be loosened or if the riveting points shrink or deform after high temperature, then the lid will fall off. To prevent the lid, only pay attention to the following two problems: one base should be made of heat-resistant materials, two riveting points should be riveted and fixed properly, and the above two problems should be solved. It's perfectly solved.