Classification Of Corks

Natural stopper
There is a type of natural cork called "natural cork", which is named because it has not undergone special treatment. Natural corks have the appearance of many small holes, but when pressed into a wine bottle, the small holes disappear. Other processed corks are classified into Special Grade, Super Grade, First Grade, Second Grade, and Third Grade according to their surface pore size, whether there is hardwood on the surface, and the surface roughness.
"Low grade corks cannot be used for direct bottling, as they have many uneven holes on the surface and too large gaps that can cause spillage.". Therefore, such corks need to undergo further processing, which is to fill the small holes, that is, filling treatment. The general process is to first mix the cork chips generated during the processing of the cork with glue, and then roll them on the processor together with the cork to fill the large holes. Finally, a filling plug with no obvious small holes but visible filling traces is generated.
Composite plug
There is also a type of cork called composite cork, which, as you can see from the text, must be processed from several raw materials. Yes, the composite stopper is made by mixing some cork particles with glue and then filling it into a mold to press it, but how can the cork be granular? Cork particles are of course not purely natural, but are made from leftovers or corks with particularly large pore sizes that are left over during the cork processing process and crushed by a pulverizer. At the same time, due to different molds, composite plugs can be made into different shapes and specifications according to needs, and their biggest feature is that obvious particles can be seen sticking together.
Careful friends will find that a champagne cork is a composite of two types of corks, the main body of which is a composite cork, except for a section where two or three pieces of natural cork with uneven thickness are added. With the development and improvement of technology and the need for use, most of the current corks are made by recombining the above types of corks. Champagne cork is the best proof.