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A technology of injection molding and weld lines, which is applied in the field of injection compression molding, can solve problems such as prominent weld lines, and achieve the effect of optimizing process parameters
Inactive Publication Date: 2014-12-17
南通冠东模塑股份有限公司
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[0004] The object of the present invention is to provide a multi-material porous non-weld line injection molding method to solve the problem of prominent weld lines in multi-material porous compression molding in the prior art
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Embodiment 1
[0020] The multi-material porous non-weld line injection molding method provided by the present invention comprises the following steps:
[0021] S1, according to the shape of the above teacup holder, first make figure 1 the mold shown;
[0022] S2, set mold temperature to 75°C, base material temperature to 180°C, auxiliary material temperature to 200°C, pressure to 150MPa, clamping force to 1600T, base material to ABS, auxiliary material to PMMA, weight ratio of ABS to PMMA 16:1, 118S After molding, the product is demoulded.
[0025] The multi-material porous non-weld line injection molding method provided by the present invention comprises the following steps:
[0026] S1, according to the shape of the above teacup holder, first make figure 1 the mold shown;
[0027] S2, set mold temperature to 85°C, base material temperature to 270°C, auxiliary material temperature to 250°C, pressure to 180MPa, clamping force to 2500T, base material to ABS, auxiliary material to PMMA, weight ratio of ABS to PMMA 30:1, 142S After molding, the product is demoulded.
[0030] The multi-material porous non-weld line injection molding method provided by the present invention comprises the following steps:
[0031] S1, according to the shape of the above teacup holder, first make figure 1 the mold shown;
[0032] S2, set mold temperature to 80°C, base material temperature to 230°C, auxiliary material temperature to 240°C, pressure to 170MPa, clamping force to 2000T, base material to ABS, auxiliary material to PMMA, weight ratio of ABS to PMMA 22:1, 130S After molding, the product is demoulded.
[0033] The pass rate of its products reaches over 98.5%, and there is no weld line by visual inspection.
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Abstract
The invention provides a multi-material porous weld-mark-free injection moulding method. The method comprises the following steps: step one, manufacturing a mould with a cavity having the same shape as the product; step two, weighing a basic material and an auxiliary material according to a weight ratio of 2-36:1, setting the mould temperature of an injection machine at 75 to 95 DEG C, wherein the basic material melt temperature is 180 to 285 DEG C, the auxiliary material melt temperature is 180 to 270 DEG C, and the mould locking force is 1000 to 2500 T, and finally carrying out moulding for 30 to 240 seconds and then demoulding so as obtain the finished product. In the provided method, the basic material and the auxiliary material can be two different plastics with different properties, thus the product has different characteristics, and the weld mark cannot be seen by eyes through optimizing the technology parameters.
Description
technical field [0001] The invention relates to the field of polymer materials, in particular to an injection compression molding method. Background technique [0002] Compression molding is an important technical process in plastic molding. Due to the limitations of a single plastic in terms of material, it is urgent to propose a material that integrates the superior properties of multiple plastics; Especially in the preparation of porous products, the molten plastic needs to overcome multiple obstacles to achieve self-leveling, and, due to the increase in the viscosity of the material at the multi-material mixing place, the above technical difficulties are more prominent in multi-material molding. [0003] After many tests, the applicant proposed a multi-material porous non-weld line injection molding method, which can overcome various technical problems in the above-mentioned multi-material porous compression molding. Contents of the invention [0004] The object of th...
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