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Common problems and solutions to LSR products
Mar 28, 2018

1. Incomplete curing of products


Cause analysis:


(1) the temperature is too low


The liquid silica gel is usually vulcanized with platinum, and the vulcanization temperature is generally between 110 and 150 degrees C, (because the temperature of the silicone material and the structure of the products vary slightly).


Countermeasures: test the temperature of the mold (according to the actual measurement), appropriately improve the mold temperature.


(2) the time of vulcanization is too short


The vulcanization time of liquid silica gel is usually between 60S and 300S. (because the difference of the vulcanization time of the silica gel material and the product structure is different, the actual situation is accurate).


Countermeasure: prolong vulcanization time properly.


(3) contamination of injection pipes or moulds


Some oil - like pollutants will destroy the vulcanization structure of liquid silica gel. For example, the oil of the machine and the antirust oil on the mold and the sweat and fat on the worker's hands will affect the vulcanization of the liquid silica gel


Countermeasures: cleaning injection pipe, cleaning mold. Ask the workers to wear finger or gloves.


(4) unequal mixture


Liquid silica gel is a double component of A/B, and it should be fully mixed and uniform before vulcanization.


Countermeasures: try to use the mixing system of brand manufacturers to adjust the speed and pressure of the agitator.


(5) the glue is too cold


In order to extend the service life of rubber products, some companies often store the mixed rubber in cold storage when they are temporarily out of production. When they are used again, they will directly join the production.


Countermeasures: refrigerated storage materials need to be placed at room temperature for a period of time.


(6) low temperature of embedded material (plastic or hardware)


This is mainly aimed at the adhesive products, especially in the thick embedded products, and the temperature of the workshop is low (mainly in winter).


Countermeasures: preheating embedded objects.


Two. The surface of the product is unfamiliar (or partially unripe)


Cause analysis:


(1) there is a problem with demoulding agent


There are many types of liquid silica gel, even if it is the same model of different manufacturers of silica gel properties will be different, the use of the mold is different.  Generally, the use of silicon - containing demoulding agent, specific to the manufacturers recommended.


Countermeasures: replacement of demoulding agent


(2) the surface of the mold is polluted


In production, there may be grease contaminants in the mold (antirust oil, machine oil or worker's finger sweat).


Countermeasures: using toluene to clean the mold.


(3) embedded objects (plastic / hardware) pollution


Some embedded objects (plastic / hardware) will be stained with dirt and grease in the production process, and the follow-up process has not been treated clean.


Countermeasures: before molding, we must clean the embedded objects and then produce them after drying.


(4) air pollution


Liquid silica gel products usually use air pressure (air gun) to demolde during the production process. If the air in the air compressor is not clean, it is easy to spray the dirt onto the mold and affect the products.


Countermeasures: check air road, clean or replace air compressor filter and dryer


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