Wood-plastic profiles are mainly made of wood as the base material, thermoplastic polymer materials (plastics) and additives. The thermoplastic polymer materials are mixed evenly and then coated on the surface of the profile by mold equipment and then extruded. High-tech wood-plastic profile, which has both the performance and characteristics of wood and plastic, is a new type of composite material that can replace wood and plastic. During the use of the current mold, the thermoplastic polymer material will have the problem of uneven flow after it is passed into the mold cavity, resulting in a rough surface formed by the thermoplastic polymer material on the wood, and the poor water cooling effect will lead to deformation of the formed surface . Some enterprises have proposed a production line for wood-plastic co-extrusion profiles and its production process, which solves the problem of rough surfaces of the plastic layer of wood-plastic profiles during production in the prior art.

Its principle and effect are as follows:

1.When the co-extrusion mold is used to produce wood-plastic co-extrusion profiles, the core body is first transferred to the feed port, feed cavity and extrusion cavity connected to the feed cavity of the co-extrusion mold through the core conveying device At the same time, the plastic supply device sequentially feeds thermoplastic polymer materials into the extrusion cavity through the channel and the gap connected with the extrusion cavity, and the thermoplastic polymer material will be coated on the surface of the core to form a plastic layer. When the thermoplastic polymer material enters the extrusion cavity through channels and gaps, the gap can make the thermoplastic polymer material more uniform when entering the extrusion cavity, ensuring that the thermoplastic polymer material flows into the extrusion cavity uniformly and synchronously. The polymer material forms a delicate and smooth plastic layer on the surface of the core body, which solves the problem of rough surface of the plastic layer of the wood-plastic co-extrusion profile.

2.The co-extrusion mold is divided into three parts, the upper mold, the lower mold, and the end mold are connected together by bolts to form a co-extrusion mold. The end mold is provided with a feeding cavity and a plastic inlet channel, an extrusion cavity is formed between the upper mold and the lower mold, the core enters the extrusion cavity through the feeding cavity, and the thermoplastic polymer material passes through the plastic flow channel The channel enters the extrusion cavity, and the thermoplastic polymer material is coated on the surface of the core in the extrusion cavity to form a plastic layer.

3.The feeding cavity is surrounded by a circular edge, the outer wall of the circular edge is inclined, and the end away from the feeding port is inclined inward, so that the thermoplastic polymer material can flow into the extrusion cavity through the annular gap in an all-round and uniform manner. , and cover the surface of the core to form a plastic layer.

4.The channel includes the plastic inlet channel set on the end mold for conveying plastic and is connected to the plastic supply device. The plastic inlet channel communicates with the extrusion cavity through the diversion channel and the gap in turn, and the diversion flow The channel will evenly divide the thermoplastic polymer material into the plastic flow channel, so that the thermoplastic polymer material can evenly flow into the extrusion cavity through the surrounding gap, and form a uniform shape on the surface of the core body in the extrusion cavity. And the smooth plastic layer can make the wood-plastic co-extruded profile better airtight and waterproof. The shunt flow channel is set on the side of the cavity mold in contact with the end mold and surrounds the periphery of the extrusion cavity. The plastic flow channel passes through the main flow path, several branch paths, overflow channels, gaps and extrusion molds in turn. The cavity is connected, so the material can be supplied to the extrusion cavity from all directions, avoiding the situation that the plastic layer is not smooth or cannot completely cover the core due to uneven material supply, so that a uniform layer can be formed on the surface of the core. plastic layer.

5.The plastic layer is a thermoplastic polymer material that is formed on the surface of the core at high temperature. Therefore, it needs to be cooled after the plastic layer is formed. Water cooling is carried out after conveying out of the mold. At this time, the temperature of the plastic layer is still high, easily deformed, and the cooling effect is poor. Therefore, deformation or pitting may be formed on the surface during the conveying process, which will affect the quality of the profile. In the present invention, a water-cooling channel is provided on the co-extrusion die. The water-cooling channel includes a plurality of interconnected upper channels and lower channels, so the cooling area is larger. The upper channel and the lower channel are respectively arranged on the upper and lower sides of the extrusion cavity. Therefore, it can have a good cooling effect on the profile in the extrusion cavity, and the plastic layer will not be deformed or pitted, so that the plastic layer can form a smooth surface on the surface of the core. One end of the lower channel closest to the contact surface is connected to the water inlet pipe, and the upper channel far away from the contact surface is connected to the water outlet pipe. The channel can be connected, and the water inlet pipe and the water outlet pipe are connected with the water storage tank, so the water can circulate between the water storage tank and the water cooling channel, and play a good cooling effect on the wood-plastic co-extrusion profile. The plastic inlet channel is connected with the plastic supply device, and the plastic supply device can provide thermoplastic polymer materials for the production process of wood-plastic co-extruded profiles, so as to form a plastic layer on the surface of the core body.

6.The core is conveyed into the extrusion cavity connected to the feed port through the core conveying device. After starting the drive motor, the two roller conveyor belts will start to drive at the same time, thereby driving the core in the core conveying channel to the Feed port movement.

7.After the surface of the core body is coated with a plastic layer to form a wood-plastic co-extruded profile, it will be cooled and shaped through the water-cooled channel after the co-extrusion cavity is initially cooled by the water-cooled tank. The spraying device on the side of the water cooling tank will spray the wood-plastic co-extrusion profile in the water cooling tank to realize the cooling and shaping of the wood-plastic co-extrusion profile, and ensure that the plastic layer coated on the core is smooth and even without deformation or Pockmarks appear.

8.After the core is conveyed into the extrusion cavity, the plastic is simultaneously conveyed into the extrusion cavity to cover the surface of the core, and a plastic layer is formed on the surface of the core. Due to the high temperature of the plastic, it is formed After the plastic layer, first pass cooling water into the water-cooling channel to initially cool the wood-plastic co-extruded profile. The shower pipe is sprayed for further cooling and shaping to ensure that the plastic layer is uniform and the surface is smooth.

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