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Lead shielding. Lead bricks are commonly used as radiation shielding. Lead shielding refers to the use of lead as a form of radiation protection to shield people or objects from radiation so as to reduce the effective dose. Lead can effectively attenuate certain kinds of radiation because of its high density and high atomic number; principally ...
Appearance. Induction sealing is the process of bonding thermoplastic materials by induction heating. This involves controlled heating an electrically conducting object (usually aluminum foil) by electromagnetic induction, through heat generated in the object by eddy currents. Induction sealing is used in many types of manufacturing.
Hermetic seal. A hermetic seal is any type of sealing that makes a given object airtight (preventing the passage of air, oxygen, or other gases). The term originally applied to airtight glass containers, but as technology advanced it applied to a larger category of materials, including rubber and plastics.
The jar. The Fowler's Vacola system uses glass jars, single use rubber ring seals and pressed metal lids, much like American Mason jars first patented in 1858, except that the jars and lids are not threaded. During the canning process, while still hot (and presumably sterile ), the lids are secured by metal tension clips which are removed once ...
Double seam. A double seam is a canning process for sealing a tin can by mechanically interlocking the can body and a can end (or lid). Originally, the can end was soldered or welded onto the can body after the can was filled. [1] However, this introduced a variety of issues, such as foreign contaminants (including lead and other harmful heavy ...
Instead of a lid, cellophane and rubber bands (moldy). Using the water bath technique for low-acid foods (foods with pH greater than 4.6). [15] Otherwise correct water bath or pressure canning but processing for too little time, the wrong pressure, or not considering variations in time/pressure due to altitude. Re-using one-use seals
Uranium glass used as lead-in seals in a vacuum capacitor. Glass-to-metal seals are a type of mechanical seal which joins glass and metal surfaces. They are very important elements in the construction of vacuum tubes, electric discharge tubes, incandescent light bulbs, glass-encapsulated semiconductor diodes, reed switches, glass windows in metal cases, and metal or ceramic packages of ...
A precursor to the flip-top, the "bail" or "Kilner" closure was invented in 1859, where a lid with gasket was held by a wire harness and sealed by a separate set of wires. Examples of flip-top bottles. The first flip-top closure was created by Charles de Quillfeldt in the United States, who filed for a patent on 30 November 1874.
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