1. Raw material preparation: select high-quality rubber or plastic raw materials, mix them according to the formula ratio, and add fillers, additives, pigments and other auxiliary materials.

2. Mixing preparation: Put the mixed raw materials into the mixer for mixing to make them evenly mixed, and gradually heat to a certain temperature to make them soft and sticky.

3. Extrusion molding: put the mixed material into the extruder, and extrude the rubber strip through extrusion molding. In the extrusion process, it is necessary to select different extrusion dies and extrusion speeds according to the shape and size of the door and window sealing strips.
4. Cutting to length: Cut the extruded long strip of rubber material, and cut it to a size suitable for door and window installation according to the required length and width.
5. Packing and leaving the factory: Pack the cut door and window sealant strips, usually using plastic bags, cartons and other packaging materials, and carry out quality inspection, labeling, etc., and then transport them to the warehouse or leave the factory.
It should be noted that during the production process, attention should be paid to controlling parameters such as temperature, extrusion speed, and extrusion pressure to ensure the quality of the sealing strip. At the same time, strict quality testing is required to ensure that products meet relevant standards and requirements.