Serrated cutting knives are specialized implements, characterized by the presence of precisely-engineered serrations along their cutting edge. This unique geometry is crucial, as it enables the tool to facilitate the processing of various substrates while requiring minimal downward force and maintaining an optimal perpendicular contact angle (90 degrees).
Furthermore, the identification of these cutting implements is often determined by the substrate they process or their specific area of application. These specialized functional names include: Tape packer blades, Tape cutters, Packaging machine knives, Toothed packaging knives, Bagging machine knives, Wrapping machine knives, and General packaging knives.
Perforation Machine Knives for Packaging
Perforating blades or perforation knives are specialized variations of the crush knife distinguished by a serrated or perforated cutting edge. This design facilitates a perforated cut, and the specific pattern of the finished material’s perforation can be precisely controlled by the tooth count (density) of the perforating knife
Cutting Methodologies
The process of cutting with these implements is categorized into two primary methodologies: rotary cutting and vertical cutting.
- Rotary Cutting: This is executed using circular perforating knives that roll against a counter knife or counter shaft. This mechanism enables the continuous processing of web materials.
- Vertical Cutting: This method employs flat perforating knives paired with flat counter blades, simulating a chopping or shear-like action.
During the cutting or perforating process, the knife must be engaged against the counter blade/shaft with a specific applied force. To mitigate this required pressure and subsequently extend the operational life of the knives, heating technology is often integrated when processing web materials. Essentially, a perforating knife utilized for cross-cutting creates a series of small, strategically placed holes in the material, which collectively form the desired perforation line.
Industrial Applications
Collectively, this category of specialized serrated and toothed cutting implements demonstrates substantial utility across virtually all modern industrial environments. The broader applications for these blades are often defined by the need for low-force shearing or precise material separation.
Primary industrial utilization sectors include:
- Packaging: Handling films, foils, plastics, and various web materials (e.g., in wrapping, bagging, and tape-cutting machinery).
- Paper and Converting: Processing materials like paperboard, cardboard, tissue, and continuous paper webs (often involving cross-cutting and perforation).
- Food Processing: Ensuring clean, consistent cuts on various products, including baked goods, produce, and packaged items.
- Textile and Non-Wovens: Cutting and separating synthetic and natural materials requiring high-precision edges.
