Closures for collapsible tubes are generally made of plastics materials today, and both thermosetting and thermoplastics types are available with a variety of external shapes and internal threads for screwing tightly on to tube nozzle.
Closures for collapsible tubes are generally made of plastics materials today, and both thermosetting and thermoplastics types are available with a variety of external shapes and internal threads for screwing tightly on to tube nozzle.
当今，(装)膏状物小(金属)管的管盖通常由塑料材料制成，不管是热硬化性塑料还是热塑性塑料皆可，它们外型各异，并配有不同的内螺纹以保证管盖与管口能拧紧。