| 摘要 |
<p>The present invention relates to improved blades for severing sheet materials such as polymeric sheets, metallic foils, and other sheet materials, particularly those suitable for use in the containment and protection of various items including perishable materials. The present invention provides an improved blade for severing sheet materials wherein design parameters for the design of the blade teeth have been tailored for improved severing performance. The blade comprises a blade body and a plurality of individual teeth extending outwardly from the blade body. The teeth each have a finite tooth radius and at least one tooth parameter selected from the group of optimized tooth parameters consisting of a tooth radius less than about 0.005 inches, a tooth pitch of less than about 0.050 inches, and a tooth thickness of less than about 0.006 inches. In a preferred embodiment of a blade in accordance with the present invention, at least two tooth parameters are selected from the group of optimized tooth parameters, and even more preferably three tooth parameters are selected from the aforementioned group of tooth parameters. Blades in accordance with the present invention may be unitary or composite structures and may be constructed in accordance with conventional fabrication techniques from a wide variety of commonly-available materials. Severing blades in accordance with the present invention may be affixed to and utilized in combination with a carton or container of generally conventional design for containing and dispensing a sheet material from a continuous web or utilized independently of a dispensing product container either as a hand-held implement or affixed to any stationary object, depending upon the operating environment. Such blades may be utilized to sever a wide variety of sheet materials, including two- and three-dimensional polymeric sheet materials.</p> |
