LED light bar lens bonding what _LED light bar lens bonding technology explain

LED light bars generally refer to led light strips. Led strips refer to the assembly of LEDs on a ribbon-shaped FPC (flexible circuit board) or PCB rigid board, because its product is shaped like a ribbon. Because of its long service life (generally normal life span is between 8 and 100,000 hours), it is also very energy-efficient and environmentally friendly and it has gradually emerged in various decorative industries.

1. The flexible LED strip is assembled with FPC and assembled with SMD LED so that the thickness of the product is only the thickness of a coin and does not occupy space; the general specifications are 30cm long, 18 LEDs, 24 LEDs and 50cm long 15 LED, 24 LED, 30 LED and so on. There are 60cm, 80cm, etc., different users have different specifications. And can be cut off at will, but also can be arbitrarily extended without affecting the light. The FPC material is soft, can be bent, folded, rolled, can move freely in three-dimensional space and stretching without breaking. Suitable for use in irregular places and places where space is limited, and because it can be bent and wound arbitrarily, it is suitable for arbitrarily combining various patterns in advertisement decoration.

2, LED hard light bar is to use PCB hard board to do the assembly circuit board, LED useful SMD LED assembly, but also useful for LED assembly line, depending on the need to use different components. The advantage of the hard light bar is that it is easier to fix, and it is more convenient to process and install; the disadvantage is that it cannot be bent freely, and it is not suitable for irregular places. There are 18 LED, 24 LED, 30 LED, 36 LED, 40 LED and many other specifications for LED strips for rigid light strips; there are 18, 24, 36, and 48 LEDs for LED Different specifications, such as positive and lateral, are also known as Great Wall Lights.

1, soft, can be arbitrary curl.

2. Can be cut and extended.

3, the light bulb and the passageway are completely covered in the flexible plastic, the insulation and the waterproof function are good, use the insurance.

4, strong weather resistance.

5, not easy to break, long life.

6, easy to create graphics, text and other modeling; the front has been widely used in the construction of things, bridges, pathways, gardens, gardens, ground, lie boards, furniture, buses, lakes, underwater, posters, pink cards, signs, etc. Whitewash and light up.

At present, LED backlight source strips are widely used by the mainstream manufacturers of lens dispensing, pasting, curing of the fully automated process flow, the adhesive used in lens bonding are mainly two types: one is UV glue, abbreviated as shadowless glue, used The UV light curing; the other is a low temperature epoxy glue, there are manufacturers called thermosetting glue, using heat curing. Two types of adhesive have their own advantages and disadvantages, and they will be described in detail below. However, from the perspective of the market as a whole, the proportion of UV adhesive is higher.

UV glue (shadow glue), also known as photosensitive glue, UV-curing glue, shadowless glue is a type of adhesive that must be cured by ultraviolet light irradiation, it can be used as a binder, can also be used as paint, paint, Used for rubber and other rubber compounds. UV is the abbreviation of English Ultraviolet Rays, which is ultraviolet light. Ultraviolet (UV) is invisible to the naked eye and is a piece of electromagnetic radiation other than visible light, with a wavelength in the range of 110 to 400 nm.

The curing principle is that the photoinitiator (or photosensitizer) in the UV-curable material absorbs ultraviolet light to produce active free radicals or cations upon irradiation of ultraviolet rays, initiates monomer polymerization, crosslinking chemical reaction, and makes the adhesive within seconds. From liquid to solid state.

UV light source UV radiation (or density);

UV light source spectral distribution (wavelength): recommended 365-395 wavelength

Radiation energy (or UV energy) of UV light source: Recommended 1500-2500 mJ

UV light source and glue radiation distance;

UV glue formula design;

The type of bonding substrate;

The depth of cure of the glue;

The O2 concentration of the curing environment and so on.

Adhesion to plastics, glass, metal, etc. is very good;

Long process operation, UV curing speed, a few seconds to tens of seconds can be cured;

After curing, it is completely transparent, the product is stable for a long time, and it is not whitened;

No VOC volatiles, no pollution to the ambient air;

One-component system, no mixing, easy to use.

In today's UV gel market, we must pay attention to the distinction. Good quality uv glue, different models in the degree of curing, adhesive strength, viscosity and color, etc. Although different (according to customer requirements to adjust), but should have the following characteristics:

(1) The adhesive strength is good, the bonding speed is moderate, and it can be cured and cured within a few seconds under an appropriate ultraviolet light source. The structural adhesive strength can be achieved within tens of minutes and the best strength can be achieved within 24 hours.

(2) The cured adhesive layer has good toughness and strong impact resistance.

(3) is an environmentally friendly adhesive, low toxicity and low volatile components.

(4) Transparent and almost colorless, almost no irritation to the skin.

(5) Low requirements for the source of ultraviolet light, mercury lamps and LED light sources can be applied.

Low-temperature epoxy adhesive generally refers to adhesives made primarily of epoxy resins and is used exclusively for LED lenses (silicon lenses, PC lenses, glass lenses, PMMA lenses, etc.) and substrates (FR-4, metal substrates, ceramic substrates). Bonding between alloy substrates, etc.) According to the curing conditions are classified as cold curing glue (non-heat curing glue, also known as low temperature epoxy glue.

The main features of LED light bar bonding epoxy products

Low temperature curing, typical curing conditions: 80 degrees Celsius 10-20 minutes;

After curing, the product has excellent toughness;

After curing, excellent impact resistance;

Single component, convenient application;

Store at low temperature and leave it at room temperature for a while before use;

Longer process operation time guarantees that there is no obvious change at room temperature for 3 days;

For some plastics, metals, ceramics and other materials, the adhesive properties are excellent.

80 °C 10 minutes heating can quickly cure;

Suitable for syringe dispensing or printing process;

Has good storage stability and working life;

With low shrinkage and high bond strength characteristics;

Excellent resistance to high and low temperature impact, thermal strength, heat aging

The comprehensive table of parameters of UV glue and low temperature epoxy glue is as follows:

Index Plastic Category UV Adhesive Low Temperature Epoxy Adhesive

Color glue colorless transparent white

Dispensing manual dispensing or syringe dispensing syringe dispensing or screen printing

Curing method UV curing curing

Curing speed is fast (about 1 minute) Slow (about 10 minutes)

Bonding strength - very high pull

Adhesion toughness - strong impact resistance

Weather resistance, strong resistance to aging

High temperature resistance is generally strong

Moderate cost is high

Combined with the above comprehensive comparison, UV adhesive lenses are preferred for manufacturers that require high production efficiency and convenient production operations. For manufacturers who require high reliability or use high-power LED wicks, they will The use of low temperature epoxy adhesive bonding depends on the manufacturer's own equipment and process requirements.

According to the customer's different processes, there are two main types of LED backlight glue: epoxy structural adhesive and UV curable adhesive.

1, TSE1902B single component epoxy glue:

High viscosity, strong adhesion, good storage, can be cured at 75°C, no dust after curing.

2, TSE1408 UV curing adhesive:

High viscosity, high strength, good toughness, impact resistance, suitable for bonding of LENS and substrate.

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