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For safety reasons, many factories blunt the tips of scissors that are normally
pointed. In a closed position, the tip of the scissor is rounded. This way the scissor
will not stab people, tear holes in pockets, snag material, etc. |
Fillistering is similar to blunting, but takes it a step further. Each tip of a
scissor or shear is rounded in the open position, instead of closed. This means
that 1/8" to 1/4" of the cutting edge is rounded. This is done so that
it is difficult for a user to cut themselves when closing the blade. The skin is
pushed forward, not pinched and cut. Material cut is not affected, since it is usually
much thinner than pinched skin. |
A knife edge is done by precisely grinding the cutting edge of one blade to a sharper
angle for easier cutting. Excellent feature for cutting upholstery, carpet, heavy
fabrics, Kevlar, leather, belting and other tough to cut materials. |
Serration or corrugation are sharp notches cut into the edge of one or both blades
of a scissor or shear. The serration keeps the item being cut from slipping forward.
Serration is effective in holding thin and slippery materials such as silk, polyester,
Kevlar, Spectra and nylon, as well as thick and hard materials like wire, sheet
metal, twigs, rope and rubber without pushing. Different types of serration are
available, from a fine 40 teeth/inch to a coarse 16 teeth/inch. The thicker the
material to be cut, the coarser the serration needs to be. |
