The "China Building Materials Network" LED light strip production is low because of the low threshold, so there are many people who have launched this project. However, experienced people still have the means to identify that the LED strips produced by regular manufacturers and the LED strips of the cottage version (that is, the products produced by manual operation in the rental house) can be seen from the appearance. from. Let's talk about how to identify the quality of LED strips by eye: 1. Look at the solder joints. The LED strips produced by the regular LED strip manufacturers are produced by the SMT chip process using solder paste and reflow soldering processes. Therefore, the solder joints on the LED strips are relatively smooth and the soldering amount is not large, and the solder joints extend in an arc shape from the FPC pads to the LED electrodes. The soldering spot of the LED lamp strip of the cottage version is not uniform, and a dot is wrapped around the soldering foot, and there are different degrees of tin tips. This is a typical phenomenon of manual soldering. 2. Look at the quality of FPC. FPC is divided into copper and rolled copper. The copper foil of the copper plate is convex. If you look at it, you can see it from the connection between the pad and the FPC. The rolled copper is closely integrated with the FPC and can be bent freely without peeling off the pad. If the copper plate is bent too much, the pad will fall off. If the temperature is too high during maintenance, the pad will fall off. 3. Look at the cleanliness of the surface of the LED strip. If the LED strips produced by the SMT process are used, the surface is very clean and does not see any impurities or stains. However, if the cottage version of the LED light strip produced by the hand soldering process, the surface will remain stained and cleaned regardless of how it is cleaned, and flux and tin residue will remain on the surface of the FPC. 4. Look at the packaging. Regular LED strips will be packed in anti-static coils, usually 5 meters or 10 meters, and then sealed with anti-static moisture-proof bags. The cottage version of the LED light strip will use the recycling coil tray because of cost savings, and then there is no anti-static moisture-proof packaging bag. Look carefully at the coil tray to see the traces and scratches left when the label is removed. 5, look at the label. Regular LED lights with printed bags and reels will have printed labels instead of printed labels. The label of the cottage version is printed, and the specifications and parameters are not uniform. 6, see the attachment. Regular LED strips will be accompanied by instructions for use and strips in the box, as well as LED strips with connectors or decks; the cottage version of the LED strips do not have these accessories in the box, because Some manufacturers can still save the province after all.
Application
a.textile industry:PVA is mainly used as a warp dressing agent, textile finishing agent and the raw material of vinylon;
b.construction :upholstery industry 107 glue, it's used as an additive of cement and mortar, inner and outer wall paints, and moulding board binder.
c.chemical industry: it's used as a polymer emulsifying agent, dispersing agent and used to produce PVA formal, PVA acetal and PVA butyral.
d.paper industry:It's used as an adhesive in lumbering and paper-making industries.
e. agriculture: used as a soil improving agent, pesticide reinforcing agent and PVOH thin film
f. used as a well-fixing agent in petroleum exploitation.
g. It can also be used into cosmetic, medicine, printing, ceramics, steel-making, electronics and plating.
PVA Resin
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