Patent Application
20150130107
The present invention relates to a recycling method of waste fishnet.
2. Description of the Prior Art
Usually, fishnets are made of nylon-6, and nylon-6 has good mechanical intensity, high softening point and durability of heat, oil, acid and base; also, it has characteristics which can facilitate processing. However, after being used for years, fishnets are oxidized or cracked due to being immersed in seawater or exposed to sunlight for a long time, and the structural intensity will be weakened.
Therefore, fishnets become consumable. A large quantity of fishnets is abandoned, and thus it is not eco-friendly. In addition, a large amount of dirt, waterweed, shell and garbage is stuck in waste fishnets, so waste fishnets are difficult to be recycled. Besides, even if waste fishnets are recycled, the insufficient mechanical characteristic such as structural strength of the recycled nylon-6 makes it hard to be reused.
The present invention is, therefore, arisen to obviate or at least mitigate the above-mentioned disadvantages.
The main object of the present invention is to provide a recycling method of waste fishnet so as to effectively recycle waste fishnets and remanufacture the waste fishnets into other articles.
To achieve the above and other objects, the present invention provides a recycling method of waste fishnet, including the following steps.
Roughly cutting waste fishnets; removing large impurities in the waste fishnets; chopping the waste fishnets; cleaning the chopped waste fishnets; drying the cleaned waste fishnets to form fishnet chips; mixing the fishnet chips and nylon-66 together, wherein the fishnet chips are of 70% by weight, and nylon-66 is of 30% by weight; melting the mixed fishnet chips and nylon-66; granulating the molten fishnet chips and nylon-66 to form grains; and spinning the grains produced in the step of granulating.
Thereby, the present invention can process the waste fishnets in advance and add proper materials to allow the grains to be manufactured into useful recycled materials.
The present invention will become more obvious from the following description when taken in connection with the accompanying drawings, which show, for purpose of illustrations only, the preferred embodiment(s) in accordance with the present invention.
Please refer to
Cutting S11: roughly cutting waste fishnets 10 to make the following steps like removing impurities easier, wherein the waste fishnets 10 are composed of nylon-6.
Removing impurities S12: removing large impurities such as shell, garbage, waterweed, dirt and others in the waste fishnets 10. In the main embodiment, this step is carried out via human eye.
Removing metal impurities S13: metallic materials are detected by a metal detector and are removed; thereby, the metallic materials which are not completely removed in the previous step will be removed so as to prevent the metallic materials from causing mechanical damage in the following steps.
Chopping S14: further chopping the waste fishnets 10, and preferably, using a machine to chop the waste fishnets 10 into shreds whose diameters are smaller than 10 mm.
Cleaning S15: cleaning the chopped waste fishnets 10, and preferably, washing away sand or dirt via a drum washing machine.
Drying S16: drying the cleaned waste fishnets 10 to form fishnet chips 20; and preferably, dewatering the cleaned fishnets 10 through centrifugation and drying them in a drying oven to form the fishnet chips 20 which can be stored in a hopper for later use.
Mixing S21: mixing the fishnet chips 20 with nylon-66 30, wherein the fishnet chips 20 are of 70% by weight, and nylon-66 30 is of 30% by weight; preferably, the fishnet chips 20 occupy 70% of the total weight, and the nylon-66 30 occupies 30% of the total weight. In addition, the nylon-66 30 can be acquired from waste airbags or waste parachutes.
Melting S22: melting the mixed fishnet chips 20 and nylon-66 30.
Sieving S23: sieving impurities through meshes, wherein the sizes of the meshes are between 200 to 600 mesh.
Granulating S24: granulating the molten fishnet chips 20 and nylon-66 30.
Spinning S25: spinning grains produced in the step of granulating S24, and preferably, spinning with an area of 400 mesh.
Remanufacturing S26: the plastic raw material produced in the previous step can be manufactured into other plastic products.
More specifically, the viscosity of waste fishnets composed of nylon-6 is only 1.8-2.35 dl/g, so the waste fishnets are not suitable for spinning. In contrast, the viscosity of new nylon-6 can reach 2.45 dl/g, so new nylon-6 is suitable for spinning Therefore, recycled waste fishnets cannot be spun and remanufactured directly. In the present invention, nylon-66 with viscosity of 3 dl/g is mixed and melted with waste fishnets in a specific ratio so as to make waste fishnets suitable for spinning and remanufacturing, in which the viscosity of the mixture of waste fishnets and nylon-66 can reach beyond 2.45 dl/g, so the mixture is suitable for spinning. Besides, when the viscosity of waste fishnets changes, the mixing ratio of the present invention can be adjusted to allow the viscosity of the mixture to reach approximately 2.45 dl/g so as to meet the requirement of spinning
Given the above, waste fishnets can be effectively recycled, and waste fishnets as the base material are added with nylon-66 to gain enforcement, thus avoiding the problem with that the material manufactured by recycled waste fishnets will have insufficient mechanical strength and be too weak to be used. Moreover, nylon-66 can be acquired from wastes, so the recycling method of waste fishnet is low-cost and environmental-friendly.
