Phenomenon 1: The butyl rubber strip applied to the aluminum spacer strip has burrs and is not neat.

Reason: There may be impurities at the outlet of the two rubber nozzles or the rubber nozzle mouth may not be smooth.

Solution: Check if there are impurities or if the nozzle mouth is smooth at the outlet of both nozzles.

Phenomenon 2: There is a gap (white line) between the butyl rubber strip and the first sealant after lamination.

Reason: The first sealant was not applied correctly.

Solution: When applying the first layer of sealant, apply it with appropriate force and in one direction to prevent air from getting trapped in the sealant and reducing the sealing performance of the insulated glass.

What are the common problems with butyl sealant during use?
Phenomenon 3: Extrusion after heating is not smooth, and it is easy to break the glue (wire breakage).

Reason: The key to using butyl sealant lies in extrusion, and temperature control is very important during the extrusion process. Whether the temperature control is appropriate directly affects the rheological state of butyl sealant throughout the entire processing process, affecting the internal quality and appearance of the product. Special attention should be paid to temperature. Excessive temperature can cause the sealant to melt too much, resulting in no strength or even inability to form (flowing phenomenon); The temperature is too low, the fluidity of the glue is poor, and the machine cannot squeeze out the glue, which affects the construction progress. This is the main reason for the unsuccessful extrusion. Another possible reason is that butyl sealant contains bubbles during manufacturing, which can cause breakage during extrusion.

Solution: Generally speaking, the selection of temperature should be based on the extrusion temperature range provided by the manufacturer. The extruder temperature is generally set between 110-130 ℃ for the barrel and 112-132 ℃ for the head. In order to generate a certain pressure on the host and ensure uniform extrusion of the melt, it is required that the head temperature be higher than the barrel temperature. There is a certain lag in temperature, and attention should be paid during adjustment. Heating and cooling should be gradually carried out. Before coating begins, appropriate exhaust should be carried out to reduce internal bubbles and gaps, and prevent the formation of bubbles during extrusion that may cause glue breakage.

Phenomenon 4: The extrusion temperature control is appropriate, but the adhesion between the aluminum spacer and the butyl sealant is poor or inadequate.

Reason: The aluminum partition strip or conveyor belt is not clean and has oil stains and dust; The belt conveyor is too fast, and there is no time to apply glue to the aluminum spacer; The aluminum partition frame is skewed, making it difficult for the glue nozzle to pass through or the glue application position is incorrect; The initial viscosity of the sealant itself is poor.

Solution: Clean and calibrate the aluminum spacer and conveyor belt, adjust the speed of the conveyor belt; Adjust the gap between the two glue nozzles proportionally; When applying, the aluminum partition frame should be placed vertically to prevent the aluminum partition strip from not sticking due to difficulty in passing through the glue nozzle or incorrect glue application position; Butyl sealant is an elastic and viscous material that is extruded and adsorbed onto a clean aluminum strip at an appropriate temperature and pressure. The melted butyl sealant diffuses towards the surface of the adhered material, gradually wetting the surface and penetrating into the surface micropores. This is a physical process in which the butyl sealant only makes linear contact with the adhered material (aluminum strip) on the surface, and can only make surface contact with the adhered material after compression. Therefore, appropriate construction pressure and temperature are beneficial for the progress of this process.