Effervescent Tablet Bottle With Spring Cap

The effervescent tablet bottle with spring cap need control the humidity of the tube,so the effervescent tube use the desiccant, the desiccant common is silica gel or molecular sieve.I will introduce the silica gel and molecular sieve.

effervescent tablet packaging with spring cap

First.the silica gel. Silica gel is an amorphous and porous form of silicon dioxide (silica), consisting of an irregular tridimensional framework of alternating silicon and oxygen atoms with nanometer-scale voids and pores. The voids may contain water or some other liquids, or may be filled by gas or vacuum.Silica xerogel with average pore size of 2.4 nanometers has a strong affinity for water molecules is widely used as a desiccant.The silica gel is often filled in the cap of the effervescent tube,the silica gel can absorb any humidity that might cause spoilage of the pharmaceutical.

spiral desiccannt cap

Second,the molecular sieve. A molecular sieve is a material with pores (very small holes) of uniform size. These pore diameters are similar in size to small molecules, and thus large molecules cannot enter or be adsorbed, while smaller molecules can. As a mixture of molecules migrate through the stationary bed of porous, semi-solid substance referred to as a sieve (or matrix), the components of highest molecular weight (which are unable to pass into the molecular pores) leave the bed first, followed by successively smaller molecules.Some molecular sieves are used as desiccants (some examples include activated charcoal and silica gel).