The selection and use of solder paste require caution - explained by JJY

Nowadays, with the continuous development of society, many essential items have become indispensable products in life. Many electronic products are composed of one or more circuit boards, and electronic components such as resistors, capacitors, diodes, and integrated circuits rely on themSolder pasteThe solder joints formed on the circuit board are closely combined with the circuit board, achieving the electrical connection between components and ensuring the smooth operation of electronic devices.

Solder paste is an indispensable part in the production and manufacturing of electronic products, playing the role of a bridge connecting components. High-quality weld points should have a smooth and lustrous surface, an appropriate welding temperature, uniform weld point dimensions, and no defects such as burrs, sand holes, or pores. High-quality solder joints require high-quality solder paste materials to be achieved. When choosing solder paste, we might as well select solder paste products. Today, JJY Solder Paste Manufacturer will explain the usage methods of solder paste and the issues that should be noted during the usage process, hoping to be helpful to electronics factories orSMTContract manufacturers have a better grasp of the usage method of solder paste.

I. How to Store solder paste

        Solder paste should be sealed and stored in2-10℃In the refrigerator of the environment, the validity period of Xinfujin solder paste is generally3-6It lasts for one month. When in use, a queuing mechanism is adopted and the principle of first-in, first-out is followed.

How to use solder paste

1"回温" 可 以 翻 译 为 "warming up"

        After taking Xinfujin solder paste out of the refrigerator, due to the low storage temperature, condensation will immediately form on the surface of the solder paste bottle, and the water vapor in the air will condense. To prevent water vapor from mixing into the solder paste, the bottle cap should not be opened immediately after taking it out of the refrigerator for use. Xinfujin solder paste must be placed at room temperature to warm up2-4For a few hours, bring its temperature back to the natural ambient temperature.25±3℃It is strictly prohibited to use external heating devices to quickly warm up the solder paste.

2Stir

        After the solder paste has warmed up and before it is put into printing, it should be thoroughly stirred to ensure that the flux and solder powder are evenly mixed. Xinfujin solder paste manufacturer suggests that the machine stirring time is1-3Minutes, depending on the stirring method and the speed of the mixer. Generally, the manual stirring time is:3-5Minutes.3Usage amount

The dosage of Xinfu Jin solder paste should be based on the principle of adding it in small amounts multiple times. The general input amount is to the extent that the solder paste does not adhere to the scraper accessories.

Ii. Method of Using Solder Paste

        1Scraper

           Hardness: Shore hardness80-90Degree of

           Material: Rubber or stainless steel

   Scraper speed:10-150mm/sec

   Scraper Angle:60-85°

2Net board

           Material: Stainless steel or wire mesh

   Mesh thickness: Wire mesh80-150mu

                       Stainless steel mesh plate0.15-0.25mm

                       Wire spacing0.10-0.15mm

3Working environment

           Temperature25±5℃

           Humidity50±10％RH

4Cleaning of the mesh board

        When any abnormality occurs during the surface mount operation using Xinfujin solder paste, a lint-free cloth dipped in anhydrous ethanol can be used to clean the mesh board, and the blocked mesh holes can be blown through with compressed air. Personal protection should be noted during the operation.

5Tension test

        Normative requirements stipulate that the wire mesh should undergo a tension test once a week. If the tension is lower than the specified value, it should be replaced or repaired.

6Printing completed

        The solder paste printed patch should be completed in the reflow oven soldering within one hour. It should not be exposed to the air for too long. When the production line is completed or the machine stops due to a malfunction, the solder paste on the steel mesh or screen should be recycled into a solder paste bottle for sealed storage. If it stays for too long, it needs to be scrapped and cannot be reused. The shelf life of solder paste after opening is5After the expiration date, it should also be scrapped. After one batch of production is completed and the solder paste becomes dry, it can be diluted by stirring with the thinner prepared by Xinfujin solder paste.

Iii. Usage Method of Solder Paste

        There are three methods for applying solder paste: drop coating(That is, the injection type and the drip type can be further divided into manual operation and machine production)Screen printing and metal template printing.

The precautions for various usage methods are as follows:

        1Manual drop coating method――It is used for extremely small batch production, the development stage of model prototypes and performance prototypes of new products, as well as the repair and replacement of components during the production process.

        2Screen printing――It is used in medium and small batch production where the pad spacing of components is relatively large and the assembly density is not high.

        3Metal template printing――It is used for mass production and assembly of products with high density, multiple leads and narrow pitch components.

        4The quality of metal template printing is relatively good and the service life of the template is long. Therefore, the metal template printing process should generally be given priority, which is what we often refer toSMTSteel mesh printing, surface mount technology

Whether a solder paste is suitable or not, when choosing a solder paste manufacturer, when purchasing any product, it is important to consider the cost performance: good quality and low price. Relatively speaking, for "good quality and low price", it is better to choose a brand manufacturer or a large factory, as the quality is guaranteed. The reasons for this will not be elaborated .

The brand of Shenzhen JJYSolder pasteSuitable for your partners' choices, we offer a solution tailored to your needs. For solder paste, solder wire, solder bar, and flux paste, choose JJY Solder Paste Factory.