Analysis and control measures of dew point of insulating glass

[China Glass Net] Insulating glass is widely used as a new type of energy-saving building material, heat insulation and sound insulation. At the same time, the quality requirements for insulating glass are getting higher and higher. It is understood that the larger quality problem of insulating glass is the condensation of the air layer in use, and the reason for the condensation of the air layer is that the dew point of the air layer is raised during use. Therefore, controlling the dew point of the insulating glass is the key to controlling the quality of the insulating glass.

During use of the insulating glass, when the ambient temperature is lowered to lower the surface temperature of the glass to the dew point in the dry air layer, condensation or frosting may occur on the surface of the dry air layer. The performance of the insulating glass is affected by condensation or frost on the inner surface of the glass. If the air layer is not dew condensation above minus 40 degrees Celsius, there is no condensation of the air layer during the use of the insulating glass.

1. Analysis of the reasons for the rise of the dew point

The dew point of the insulating glass refers to the temperature at which the humidity of the air sealed in the air layer reaches a saturated state. Below this temperature, the water vapor in the air layer condenses into liquid water. It can be introduced that the higher the water content, the higher the dew point temperature of the air. When the inner surface temperature of the glass is lower than the dew point of the air in the air layer, the moisture in the air will condense or frost on the inner surface of the glass.

The dew point rise of the insulating glass is caused by the outside moisture entering the air layer without being absorbed by the desiccant, and there are three reasons why the dew point may rise:

(1) There are air bubbles in the sealant, which causes air moisture to enter.

(2) Water vapor diffuses into the air layer through the polymer.

(3) The effective adsorption capacity of the desiccant is low.

2, hollow glass dew point control measures

(1) Strictly control the temperature of the production environment

The production environment mainly affects the ability to attach and the remaining adsorption capacity.

(2) reduce the diffusion of moisture through the polymer

Mainly rely on the selection of low permeability coefficient of sealant to determine a reasonable sealing thickness, reduce the temperature difference between the inside and outside of the insulating glass (ie, control production within a certain temperature range without making the temperature range too large.)

(3) Reduce production process time

Minimize the contact time of the desiccant with the atmosphere, reduce the loss of adsorption capacity and make the desiccant have a higher adsorption capacity.

(4) Choosing the right aluminum profile

The pores of the pores are small, which reduces the water absorption of the molecular sieve during the operation.

(5) Choose a suitable desiccant

Choose a desiccant with a high adsorption rate and long lasting.

It is believed that the quality of insulating glass will be clearly controlled through the control of materials, processing and environment.

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