Teeth blades, also known as serrated blades or toothed cutting knives, are widely used in the food packaging industry, particularly for cutting the outer sealing packaging and various types of flexible packaging bags. These blades are essential in ensuring clean, efficient, and user-friendly cuts, especially in high-speed automated packaging lines. The selection of blade type and material is based on the packaging film’s thickness, material properties, and tearing requirements.

Common Types of Teeth Blades

There are several types of teeth configurations commonly used in food packaging applications. Each tooth shape offers unique cutting characteristics, depending on the application:

1. Single-Sided Teeth
   These blades have teeth on only one side, producing a wavy or serrated cut edge. This type of cut is often seen on snack bags, plastic films, and flow pack packaging. The wavy edge is aesthetically pleasing and helps prevent sharp edges, making it safer for consumers.

2. Double-Sided Teeth
   Featuring symmetrical teeth on both sides, double-sided blades create a straighter and more even cut. This style is preferred for packaging that demands precise and clean cuts, such as vacuum-sealed food packages or resealable bags. It ensures minimal tearing during production and contributes to a professional package appearance.

3. Dashed-Line Teeth (Perforation Blades)
   Dashed-line teeth are designed not to cut completely through the material. Instead, they create perforated lines—a series of small cuts that leave uncut intervals. This design is perfect for tear-open packaging, as it allows end users to open the package easily without scissors. Common applications include instant noodle sachets, condiment packets, and other single-use food products.

4. Cross Teeth
   Cross-toothed blades are used to handle tougher or thicker packaging materials, such as multi-layer composite films or heavy-duty plastic wraps. These blades are engineered for high durability and provide reliable cuts even in demanding packaging processes. They are especially effective for packaging with high tensile strength and strong tear resistance.

Materials Used in Teeth Blade Manufacturing

The performance and longevity of a teeth blade greatly depend on the type of steel used. Each material has its specific characteristics in terms of hardness, wear resistance, corrosion resistance, and cost-efficiency. Common materials for manufacturing teeth blades include:

• 65MN: A high-manganese carbon steel offering good wear resistance and hardness. Suitable for standard cutting applications where cost-effectiveness is a priority.

• SK-5: A Japanese high-carbon tool steel known for its sharp edge retention and hardness. Ideal for blades requiring frequent high-speed cutting.

• SUS-440C: A high-carbon stainless steel that provides excellent corrosion resistance and high hardness (up to HRC 58+), commonly used for food-grade cutting tools.

• 420-J2: A moderate stainless steel option that balances corrosion resistance and toughness. Suitable for general-purpose food packaging cuts.

• SKD-11: A high-performance cold work tool steel, similar to D2 steel, offering excellent wear resistance. Often used for high-precision blades with long life cycles.

• SKH (e.g., SKH-9, SKH-51): High-speed steel, suitable for ultra-durable applications requiring high heat resistance and exceptional sharpness retention