Manufacture of flat rubber seals

In the gasket industry, there are many different technologies that enable the precise processing of rubber and rubber materials. One of the most modern and efficient methods is the use of a CNC plotter with an oscillating knife. This technology brings a number of advantages that make it an ideal choice for processing a variety of materials, especially for small and medium batches of gaskets.

The CNC (Computer Numerical Control) oscillating knife plotter works on the principle of a computer controlled machine that controls the knife movements according to a precise digital design. The oscillating knife oscillates at a high frequency, which allows even soft and flexible materials such as rubber to be cut with high precision.

• Design and data preparation:
  The seal design is created in CAD software and then converted into a format that the plotter interprets.
• Material selection:
  The rubber plate is placed on the work surface of the CNC machine. The choice of material depends on the requirements for resistance to chemicals, temperature or mechanical stress.
• Cutting with an oscillating knife:
  The knife cuts the rubber finely and precisely according to the design, ensuring high precision and clean cut edges.
• Inspection and finishing:
  After cutting, the seal is checked to ensure it meets the required dimensions and quality.

This gasket technology has several key advantages over traditional methods:

• High flexibility: thanks to the ability to quickly change designs, the CNC plotter is ideal for the production of small and medium-sized batches, prototypes or specific orders.
• No need for moulds: Unlike traditional methods where expensive moulds must be made, the CNC plotter cuts the seal directly from the digital design. This saves costs and time.
• High precision: precision cutting minimises waste and ensures that the seal is a perfect match.

1. Laser cutting
Laser cutting is very precise and can process complex shapes. However, it can cause problems with thermal edge damage in rubber materials. Laser often produces burnt edges which can affect the quality of the seal, especially if high durability is required. 2. Die cutting production
This method is traditionally used for large batches where it is worth investing in metal mould production. It is very efficient for mass production but less flexible. Each design change requires a new mould, which can significantly increase costs and slow down the process. 3. Waterjet cutting
Waterjet cutting is very accurate and suitable for a wide range of materials, including rubber. This method does not cause thermal damage, which is an advantage over laser. On the other hand, it is more expensive to maintain as it requires the use of abrasive material and special equipment.

A detailed description of the plotter as a sealing machine can also be found, for example, at this link.