1. Use and scope of application
Plastic PP (polypropylene) profile production line is mainly used to produce polypropylene profile products of various shapes and sizes. These profiles are widely used in construction, furniture, automobiles, packaging, electronics and other fields. In the field of architecture, PP profiles can be used to make door and window frames, partitions, decorative strips, etc. In the field of furniture, it can be used to make table legs, chair backs and other parts; In the automotive field, it can be used to make interior parts, bumpers, etc. In the field of packaging, it can be used to make packaging boxes, pallets, etc. In the field of electronic appliances, it can be used to make shells, brackets, etc. Due to its characteristics of light weight, high strength, corrosion resistance and easy processing, PP profile has a broad application prospect in the market.
2. Main components of the device
Plastic PP profile production line is mainly composed of the following key parts:
Extruder: responsible for heating and melting PP raw materials and extrusion. Extruder is usually composed of screw, barrel, heating device and transmission device.
Mold system: According to the shape and size of the profile, design and manufacture a specific mold for extruding the molten PP plastic into the desired shape.
Shaping device: preliminary shaping of the extruded profile to ensure that its section shape and size meet the design requirements.
Cooling system: air cooling or water cooling is usually used to quickly cool the shaped profiles to improve their hardness and strength.
Traction and cutting device: responsible for pulling the cooled profile out of the mold and cutting it as needed.
Control system: Monitor and control the temperature, speed, pressure and other parameters of the entire production line to ensure the stability of the production process and product quality.
3. Raw material selection and preparation
The selection and preparation of raw materials is the key step in the production of PP profile. PP raw materials with stable quality and high purity should be selected, and proportioned and mixed according to production needs. In the preparation process, attention should be paid to the drying and dedusting of raw materials to avoid the impact of impurities on product quality.
4. Heating melting process
In the extruder, PP raw material is gradually heated and melted after rotation and shearing of the screw. The heating device of the extruder usually uses an electric heating wire or an electric heating rod to achieve a molten state of PP raw materials by controlling the heating temperature and time. The molten PP plastic is pushed into the mold by the screw. The stability and uniformity of the heating melting process are very important for product quality.
5. Extrusion molding
Die is the key component of PP profile production. When the molten PP plastic enters the mold, the molding part of the mold squeezes and shapes the plastic to form the desired shape. The screw speed of the extruder and the design of the die will affect the extrusion speed and shape accuracy of the profile. In the extrusion molding process, the temperature and pressure of the extruder need to be strictly controlled to ensure that the plastic can be uniformly and stably extruded.
6. Cooling and shaping technology
The extruded profiles need to go through a cooling shaping step to ensure that their cross-section shape and size are stable. The cooling system is usually air-cooled or water-cooled to quickly cool the profile below room temperature. The choice of cooling speed and cooling method will affect the hardness and strength of the profile. In the cooling setting process, it is necessary to keep the temperature of the cooling medium stable to avoid size changes caused by temperature changes.
7. Traction and cutting steps
After cooling and shaping, the PP profile needs to be pulled out of the mold by the traction device. The speed of the traction device should match the speed of the extruder to ensure the continuity and stability of the profile. At the same time, cutting devices can be used to cut the profile to the required length. The cutting process should be accurate and rapid to avoid damage to profiled profiles.
8. Inspection and packaging process
The PP profile after traction and cutting needs to be inspected for quality. The inspection content includes dimensional accuracy, surface finish, hardness and other aspects of the inspection. Qualified profiles will be fed into the packaging process for packaging, labeling, etc., for transportation and storage. During the packaging process, attention should be paid to protecting the surface of the profile from scratches and contamination.
