Surface contact type:

Tape:: Using an adhesive tape to cover glass surface can protect glass form scratch and allow the glass to stack each other. This way is very good in packing size and protection. The glass is stationary in the tape and will not hit each other. It can provide a safely protection during delivery. But the problem is on the adhesive glue. The glue provide adhesive which is the key of stationary. However, after removing the tape, the glue will left residual on contact surface of the glass. How clean it will be? It depends on how customer inspect it and eyesight strength of the inspector. For most inspector, the residual will not be seen under ordinary environment illumination and under 17W fluorescent light. But the residuals will be clear under the illumination of projective light souce. Under the inspection of microscope, the result is vary. Some can't see the residual, but some can. It depends on the light position, injection angle, light strength and the magnification power rate of microscope.

 

Gel-Pak: It is used for some special small glass and hope keep the filter partly clean ( the other side contact glue) and safe. The Gel-Pak is a box filled with a layer of glue on box contact surface. the glass will be attached on the bottom firmly during the delivery. The filter can easily pick up by clip. The Gel-Pak is very expensive and only used for small size filter. Since the glass will contact the glue on one side. It has glue residual problem in filter contact surface.

Tray(lying): The lying tray is a relative good but expensive container usd in glass. The glass lying on the separating cell can get a good protection from shipping virbation. There will be no scratch problem if the cell size match the glass. However, if the size of cell is not fit the glasss, the glass will impac the wall of cell and make serious damage or scratch. The particle may also be generated form some clastic small glass of the edge side. Most important of all, this tray is produced by mold injection. It is not easy to purchase existing shape and size of cell of tray that specific meet your products. The lot quantity usually is need to produce certain size tray.

Paper: Like tape, It can prevent glass surface directly contact with the other glass which may easily make scratch. The method allow stack each other and very good in packing size. It can prevent scratch but can't stationary the glass on certain postition firmly. If it's upper pressure is not enough (provided by upper glass or containing box). It may be broken or edge chip by collide with the wall of box or containers. The paper surface is very dirty compare to tape, the residuals are much more than tape. Only the glass did not care surface quality will pack by this method. In some condition, the paper may separate chemical composition and react with glass surface make the surface gererate un-removable mist. If such a mist generated, it can't be clean by ultra-sonic washing machine. It have to remove by polishing method. Since the polish will remove the coating layer too, purchasing a new product seem a reasonable action than polish it.

Non- contact surface type:

Tray(stand): Using tray is an prevailing method to pack with glass. By contact with the thickness side of glass, tray will not contact the main surface of the glass. And prevent the glass surface from direct contact pollution of tray surface. With each glass stand along supporting by tray interval wall, it will not scratch neither. However, Tray can only reduce the shortcoming of other method but can't eliminate them all. Glass need standing space with each other. It is bad for packing size. When the worker put the glass into tray, it may hit its neighbor glasses and to be scratched. During the shipping journey, the tray can't firmly stantionary the glass. There are also some space needed to glass and tray wall. This gap is needed for worker can put the glass into the tray. But with this gap, it make the the glass sometimes hit the tray wall due to the shipping vibration and broke the glass. The glass may also pollute with glass clastic from the edge side. Since the edge is usually fragilable due to cutting stress. This is the so called 'Particle' problem in surface quality. After the shipping journey with tray packing, customer may not get a very clean glass.

 

Modified Tray (stand+glue): In recent years, a modified tray type was introduced into market. In old type of tray, glass may hit the wall and produce particles which attached on glass surface. The modified tray add a small amount glue on the tray bottom and adhere the edge side of glass. This glue keep glass stantionary and prevent hit the wall. It really may reduce most particle which generated by impact. However, only a small size of glass can use this method. such as the size under 20x20mm