A plant fiber injection molded product and its manufacturing method and application

Abstract

The invention relates to a plant fiber injection molding product, and a manufacturing method and application thereof, belonging to the field of manufacturing of plant fiber injection molding products. The method comprises the following steps: (1) mixing plant fibers, glue and additives to obtain a plant fiber mixture; and (2) heating a mold to 110-160 DEG C within 30 seconds, injecting the plant fiber mixture into the mold cavity, maintaining the pressure at 15-350 MPa for 3-5 minutes, cooling the mold to 50-80 DEG C within 30 seconds, maintaining the pressure at 15-350 MPa for 3-5 minutes, cooling the mold to -10-30 DEG C within 30 seconds, maintaining the pressure at 15-350 MPa for 3-5 minutes, lowering the pressure to 10-15 MPa, and maintaining the pressure for 2-5 minutes to obtain the plant fiber injection molding product. The plant fiber injection molding product has the advantages of smooth surface, low cracking rate and no bubbles.

Description

technical field [0001] The invention relates to a plant fiber injection molded product and its manufacturing method and application, belonging to the field of plant fiber injection molded product manufacturing. Background technique [0002] Existing injection molded product technology, the main raw material sources in the world are thermosetting plastics, thermoplastic plastics or thermosetting rubber. However, plastics or rubber are not easy to be decomposed and rotted by microorganisms in the natural environment or landfills. In the process of combustion and incineration, a large amount of dense smoke and toxic gases will be produced, causing various environmental pollutions such as air, soil, water, etc., and become an environmental protection problem. [0003] In addition, the existing manufacturing methods of thermoplastic injection molded products need to use high temperature to keep the plastic in a molten state during mixing and injection so that it can be injected i...

AI Technical Summary

Problems solved by technology

[0002] Existing injection molded product technology, the main raw material sources in the world are thermosetting plastics, thermoplastic plastics or thermosetting rubber. However, plastics or rubber are not easy to be decomposed and rotted by microorganisms in the natural environment or landfills. In the process of combustion and incineration, a large amount of thick smoke and toxic gases will be produced, causing various environmental pollutions such as air, soil, water, etc., and become an environmental protection problem.

[0003] In addition, the existing manufacturing methods of thermoplastic injection molded products need to use high temperature to keep the plastic in a molten state during mixing and injection so that it can be injected into the mold cavity. The plastic is gradually cooled and shaped in the mold cavity before being injected. For molded products, in order to completely melt the plastic, the injection tube must be continuously heated and kept at a high temperature above 200°C. In the cavity, it must wait until the injection molded product is completely shaped and cooled below the predetermined temperature before taking it out to avoid injection. The molded product is softened and deformed, which makes the manufacturing time of the injection molded product too long. Therefore, the existing thermoplastic injection molded products have disadvantages such as unenvironmental protection of materials, waste of energy, low manufacturing efficiency, and high cost; the same thermosetting plastic and thermosetting rubber Injection molded products also have disadvantages such as unfriendly materials, waste of energy, low manufacturing efficiency, and high cost.

[0004] In order to solve the problem of non-environmental protection of materials, although some daily necessities use wood or pulp as raw materials, the existing wet manufacturing methods of wood and pulp will not only cut down trees, but also discharge a large amount of papermaking sewage, which will still have a negative impact on the environment. Serious damage, and the cost can not be reduced

[0005] In addition, in order to meet the needs of environmental protection, there have been products made of plant fibers in recent years, but these products are mainly manufactured by hot pressing. The main disadvantage of the hot pressing method is that the input material is not easy to be even Uneven thickness leads to high deformation rate and cannot form products with special structures and shapes. To manufacture products with special shapes, secondary or multiple processing is required, which has the disadvantages of high cost and low process efficiency. The products obtained by the molding method are also prone to cracking, rough surface or bubbles, and the need for secondary processing increases the cost and reduces the efficiency

Images