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LED lamp bead packaging process and precautions

Abstract: There are mainly three types of LED packaging: glue, potting, and molding. Basically, the difficulty of process control is bubbles, lack of material, and black spots. The design is mainly the selection of materials, and the choice of epoxy and brackets that are well-combined.


【High-tech LED Comprehensive Report】


9. Dispensing package

  

   There are mainly three types of LED packaging: glue, potting, and molding. Basically, the difficulty of process control is bubbles, lack of material, and black spots. The design is mainly the selection of materials, and the choice of epoxy and brackets that are well-combined. In general, TOP-LED and Side-LED are suitable for dispensing packages. Manual dispensing and packaging requires a high level of operation. The main difficulty is the control of the dispensing volume, because the epoxy will thicken during use. Dispensing for white light LEDs also has the problem of phosphor precipitation causing color difference in light output.

  

  10、Glue encapsulation

  

   Lamp-LED package adopts potting form. The potting process is to first inject liquid epoxy into the LED molding cavity, then insert the pressure-welded LED bracket, put it in the oven to cure the epoxy, and then take the LED out of the cavity to form it.

  

  11, molded package

  

Put the pressure-welded LED bracket into the mold, close the upper and lower molds with a hydraulic press and vacuum, put the solid epoxy into the entrance of the injection channel and press it into the mold channel with a hydraulic ejector for heating. The glue lane enters each LED molding groove and cures.

  

  12, curing and post curing

  

"Cure" refers to the curing of the encapsulation epoxy. The general epoxy curing conditions are at 135°C for 1 hour. Molded packaging is generally at 150 C for 4 minutes.

  

   13, post curing

  

   post-curing is to fully cure the epoxy and thermally aging the LED at the same time. Post-curing is very important to improve the bonding strength between epoxy and stent. The general condition is 120C, 4 hours.

  

  14, cutting tendons and dicing

  

   Since the LEDs are connected together in production, Lamp packaged LEDs use cutting ribs to cut the connecting ribs of the LED bracket. SMD-LED is on a PCB board and requires a dicing machine to complete the separation work.

  

   15, test

  

   Test the photoelectric parameters of the LED, inspect the external dimensions, and sort the LED products according to customer requirements.

  

   16, packaging

  

   The finished products are counted and packaged. Among them, the ultra-bright LED needs anti-static packaging.

  

The above description of the series of manufacturing steps from LED lamp beads to lamps is very clear, and nothing is so simple. We need to do it by ourselves, because the production of LED lamp beads is a very delicate work and requires no static electricity in the external environment. , Otherwise the gold thread will be destroyed. The final factory inspection is also very important. The following briefly introduces how to do electrostatic protection in the production of LED packaging from the following aspects:

  

   Static electricity protection: LED is a semiconductor device, which is more sensitive to static electricity, especially for white, green, blue and purple LEDs to prevent static electricity and eliminate static electricity.

  

   1. There are three main types of static electricity:

  

  (1) Frictional electrification: In daily life, any two objects of different materials contact and then separate, then static electricity can be generated. The most common method of generating static electricity is frictional electrification. The better the maturity of the material, the easier it is to generate electricity by friction. In addition, any two objects of different substances can be separated after contacting, which can also generate static electricity.

  

(2) Inductive electrification: For conductive materials, because electrons can move freely on its surface, if it is placed in an electric field, because the same sex repels and the opposite sex attracts each other, positive and negative ions will be transferred on its surface. Will generate electric charge.

  

  (3) Conduction: For conductive materials, because electrons can move freely on its surface, such as contact with charged objects, charge transfer will occur.

  

   2. The harm of static electricity to LED:

  

   Special attention should be paid to static electricity which also has great harm to the LED package itself.

  

  (1) Due to the instantaneous electric field or heat generated by the current, the LED is locally injured. The leakage current increases rapidly and can still work, but the brightness is reduced (white light will change color) and the life span is impaired.

  

  (2) Because the electric field or current destroys the edge layer of the LED, the device cannot work (completely destroyed), and it appears as a dead light, which is not bright.

  

   3. Elimination measures:

  

  In the entire process (production, testing, packaging, etc.), all employees who are in direct contact with the LED must take measures to prevent and eliminate static electricity.

  

  There are:

  

  (1) The workbench is an anti-static workbench, and the production machine is well grounded.

  

  (2) Anti-static floor shall be installed in the workshop and grounded.

  

  (3) Operators wear anti-static clothes, anti-static wristbands, gloves or foot rings.

  

  (4) The packaging is made of anti-static materials.

  

  (5) Use ion blower and soldering iron to make grounding measures.

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