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Common quality problems of coated glass and their cause

  • Author:Fanyu
  • Source:Chinamirrormanufacturer. com
  • Release on :2017-09-29
   I. Scratches or abrasions
  
Definition and Description: The surface of the coated glass and other hard material relative to the sliding or friction caused by the line or ribbon scars for scratches or abrasions, mainly manifested as scratches or abrasions in the glass transmittance increased, or the film surface off translucent. Its shape is irregular curved thin strips or banded.
  
Causes: scratches or abrasions are often produced in the construction and installation use, mainly:
  
1, production: As a result of equipment or cleaning, in production is the possibility of glass scratches, but this kind of scratches are generally regular and linear type, can be controlled and tested out. In addition, the production process of the coated glass to carry, boxing is also possible to cause scratches, the original film itself may also exist scratches. But objectively speaking, large-scale coating glass is directly on-line with the chip machine, generally can not cause scratches, and the enhanced coating glass is also directly after the film is boxed, the membrane surface will not contact with other hard objects, so usually will not appear scratches or abrasions.
  
2, cutting reasons: such as cutting ruler or tape measure in the glass surface of the drag; because there are sand grains or glass shavings on the glass film surface, the abrasion of the glass film surface caused by the wiping process, the coating face downward cutting or not notice the last piece of each box is the reverse direction of the reason, resulting in the glass surface and its friction caused by scratches.
  
3, Stacking and storage: After the opening of the box or after cutting the glass is not required to stack, the film between the film does not pad any liner, resulting in direct contact between glass, due to sand particles or glass chips, etc., in the process of handling or transportation caused by scratches or abrasions.
  
4, installation and cleaning: In the glue or installation, man-made cause of the scratches or abrasions caused by the hard, the use of unclean or hard wipe in the cleaning, or on the glass surface of the cement mortar and other contaminants, and the use of improper cleaning methods.
  
   II. Falling film
  
Definition and Description: The surface of the coated glass film or the phenomenon of film stripping. The main performance is the local light transmittance enhancement or the membrane layer completely falls off, the detachment membrane form generally is the guidance shape, the regiment shape and the flake shape. On the phenomenon of falling film, produced in the production process, we have strict standard control, generally speaking, the diameter of the drop film area is greater than 2.5mm is not allowed.
  
Causes: The cause of the film is more, often difficult to define, the main reasons are:
  
1. Production: Because of the coating process, in production may appear some needle-like drop film, also called the Needle, is sputtering coating process itself can not be avoided. In addition, because of the film itself or equipment cleaning reasons, there may be a film, the national standard has the corresponding requirements and regulations, our factory products are strictly in accordance with the provisions of the inspection, qualified after the factory.
  
2, transport off the film: Because the glass Open box after handling or after cutting, not in accordance with the requirements of the glass and film mat any gasket or cushion is not satisfied, resulting in direct contact between glass, in the process of handling or transportation caused by glass and glass surface direct relative friction caused by the film. This drop film is generally a point or a cluster-like drop film that can be used to feel or check the traces of friction.
  
3, corrosive film: Because of the glass surface in cutting stacking, construction use or cleaning, because of cross construction or the use of incorrect methods, so that glass surface contact with acid-base or oxidizing substances, and so on, resulting in the glass film surface contaminated corrosion and drop film. This kind of drop film generally can be found in the film surface or the site traces of corrosive substances residue.
  
   III. Spots or markings
  
Definition and Description: The surface defects of irregular black spots or stripes on the coated glass are observed from the non-plated film surface. Generally has mold, paper, suction cups, the original piece of tin and watermark and other phenomena.
  
Causes: There are more spots or stripes, which are mainly coated with the original film is defective, or after the coating due to improper storage use and other reasons.
  
1, the production aspect: in general, the coating glass production process itself will not produce these defects, mainly in the quality of the original film. For example, the original film is not fresh appearance of mold and paper marks, such as the original film itself brought about by suction and tin, such as steel or half tempered glass to clean the watermark, etc., and the original film itself is contaminated, these are likely to cause the coating glass product spots or markings defects.
  
2, Storage and construction installation: Because the glass is long placed in the humid and airless environment, or placed outdoors under the sun and rain, glass may be moldy or deterioration and appear spots or markings.
  
3, membrane pollution: Due to the installation of construction and the improper cleaning, but also may cause partial pollution of the glass, causing the appearance of spots or markings. In addition, because the glass is not in time to clean, resulting in dust and soot and other stolen goods for a long time attached to the surface of the glass, the final result of cleaning and the appearance of spots or stripes of pollution.
  
   IV. Rupture
  
Definition or Description: The rupture referred to here is mainly due to the use of cutting or installation, resulting in the glass window on the wall after the rupture phenomenon. In addition to the installation of the use of man-made impact and other causes of rupture, we generally put the coating glass after the use of the rupture is called the thermal stress rupture of coated glass.
  
Causes: Because of the coating glass and ordinary transparent glass some optical differences, so the installation of the use of more stringent requirements, it is possible to produce thermal stress rupture of the main reasons are:
  
1, in the design aspect: the heat-resistant burst design of coated glass is an important factor to be considered seriously in architectural design. In addition to taking into account the direction of the building, indoor and outdoor shielding effects, climatic conditions, the selected glass on the absorption of solar energy and other factors, the selection of what glass, such as enhanced coating glass or ordinary coated glass is also a very important factor.
  
2, in the glass installation aspect: For example, the glass in the installation process must be with the metal frame or other metal objects to maintain a certain distance, no glass corners in any direction directly contact the metal frame body or the gap is too small, not like the installation of ordinary white glass, and directly put the glass on the metal frame body, so, because of the heat-absorbing effect of the coating glass expansion , it will inevitably lead to the rupture of the glass. In addition, the uneven installation of Windows or curtain walls is an important cause of glass rupture, because the glass in the installation of uneven, will produce bending deformation, although not necessarily immediately lead to bending rupture, but because of the influence of various thermal stress factors, it greatly increased the probability of thermal stress rupture of glass, This puts forward higher requirements for the installation of coated glass.
  
3, the cutting quality of glass: glass edge cutting quality is very important, it is the main reason for the impact of glass rupture. Studies have shown that any defect in the edge can cause the tensile strength of the edge to decrease by more than 10 times times, therefore, if because of the poor cutting quality, the edge of the glass has a boundary uneven whole, no edge or no corner of the situation or there is internal, glass in the heat expansion, due to the role of internal stress, it is very easy at the edge of the point of cutting defects began to rupture.
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