A dispensing method for controlling the viscosity of photosensitive adhesive and its dispensing system

Abstract

The invention provides a dispensing method and system capable of controlling the viscosity of photosensitive adhesives. According to the dispensing method, the viscosity of the photosensitive adhesives can be regulated in real time by controlling the radiation intensity of ultraviolet light, and then the photosensitive adhesives are dropped on workpieces to be dispensed through a dispensing pump. In the dispensing method, the workpieces can make three-dimensional space movement relative to the dispensing pump, and the dispensing quantity of the dispensing pump can be regulated according to the positions of the workpieces. According to the dispensing method and system capable of controlling the viscosity of the photosensitive adhesives, the viscosity of the photosensitive adhesives can be changed to control flowing of photosensitive adhesive fluid, and the forming processes such as dispensing and gluing can be conducted on non-planar surfaces, so that the dispensing method and system are suitable for forming under conventional conditions as well as forming under complex conditions; meanwhile, the aim of conveying high-viscosity photosensitive adhesive liquid is achieved, the problems of resin molecule degradation, bubbles and the like caused by high shear of strong extrusion are solved, the forming time is shortened, and the forming efficiency and product quality are improved.

Description

technical field [0001] The invention relates to a dispensing method for controlling the viscosity of photosensitive adhesive and a dispensing system thereof. Background technique [0002] Photosensitive adhesive (UV adhesive) is also known as shadowless adhesive and ultraviolet light curing adhesive. Photosensitive adhesive refers to a type of adhesive that must be cured by ultraviolet light. It can be used as an adhesive or as a paint, coating, ink, etc. glue used. UV is the abbreviation of Ultraviolet Rays in English, that is, ultraviolet light. Ultraviolet (UV) is invisible to the naked eye and is a section of electromagnetic radiation other than visible light, with a wavelength in the range of 110nm to 400nm. The principle of photosensitive adhesive curing is that the photoinitiator (or photosensitizer) in the UV curing material absorbs ultraviolet light under the irradiation of ultraviolet light to generate active free radicals or cations, triggering monomer polymeriz...

AI Technical Summary

Problems solved by technology

Due to the flow characteristics of liquid glue, dispensing equipment and laminating equipment are limited to forming on the horizontal plane, and are helpless for complex shapes such as slopes and curved surfaces

[0004] In addition, during the reverse lamination process of the water glue laminating machine, due to the low viscosity of the water glue, the offset of the glue application position and the dripping of the glue liquid caused quality problems.

However, the use of high-viscosity water glue has problems such as liquid diffusion and liquid transportation.

In recent years, UV glue semi-curing molding methods have emerged, such as patent No. JP 2011-145534 A, PCT / JP2013 / 055894, but they are all irradiated with UV after dispensing, and the water glue is bonded in a semi-cured state. After light irradiation, the viscosity of the colloid is high in the place where the glue spit out is small, and the viscosity is low in the place where the glue spit out is large, which is not suitable for the laminating liquid glue expansion molding

Colloids of different viscosities cannot be placed where needed according to demand

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