A step-by-step pressure-controlled mold opening foaming process, device and foamed product obtained
A physical foaming agent and mold technology, applied in the field of plastic forming and processing, can solve problems such as low exhaust pressure relief speed, limited foaming process regulation, damage to high temperature and high pressure ball valves, etc., to reduce production, operation and maintenance costs, increase The effect of high cell nucleation number and exhaust pressure relief rate
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Embodiment 1
[0043] In this embodiment, a hierarchical pressure control mold opening and foaming device is provided, such as figure 1 As shown, the foaming device includes a storage tank 1, a first boost flow control pump 2, a first control valve 4, a second boost flow control pump 3, a second control valve 5, a mold 6, and a mold temperature controller 9. Air intake duct 11 and exhaust duct 12;
[0044] The storage tank 1 is used to store the physical foaming agent, and a foaming agent is stored in each storage tank. When the foaming agent used in the first stage and the second stage is different, two storage tanks should be used to correspond to the corresponding foaming agent respectively. The control pump communicates with the control valve.
[0045] The first pressurized flow control pump 2 is connected in series with the first control valve 4, and is used to inject the physical foaming agent in the storage tank 1 into the mold 6 in the first stage;
[0046] The second pressurized f...
Embodiment 2
[0051] The raw material is thermoplastic polyurethane (TPU) produced by BASF in Germany, the brand is 1180A, and its melt index and density are 15g / 10min (@190℃ / 8.7kg) and 1.11g / cm3 (@23℃). The TPU particles were dried in a vacuum drying oven, the temperature of the vacuum drying was set at 80° C., and the drying time was 3 hours. Using a tablet press and a template, the dried TPU granules are pressed into TPU sheets, the molding temperature is 200°C, and the molding pressure is 1MPa. The prepared TPU sheet is used as a blank to perform hierarchical pressure-controlled mold opening and foaming Craft test.
[0052] The first step is to preheat the TPU sheet and the mold, and the set preheating temperature is 130°C;
[0053] In the second step, after preheating, put the TPU sheet into the mold cavity, and close and lock the mold;
[0054] In the third step, nitrogen gas is introduced into the mold cavity through the first pressurized flow control pump 2, the first control valv...
Embodiment 3
[0059] The raw material is nylon elastomer (PEBAX) produced by French AEKEMA company, the grade is 35r53, and its density is 1.00g / cm3 (@23℃). The PEBAX particles were dried in a vacuum drying oven, the temperature of the vacuum drying was set at 60° C., and the drying time was 5 hours. Taking the fully dried PEBAX pellets as blanks, the foaming process test of graded pressure-controlled mold opening was carried out.
[0060] The first step is to preheat the PEBAX particles and the mold, and the set preheating temperature is 135°C;
[0061] In the second step, after preheating, put the PEBAX particles into the mold cavity, and close and lock the mold;
[0062] In the third step, through the first pressurized flow control pump 2, the first control valve 4 and the mold intake pipeline 11, carbon dioxide is introduced into the mold cavity, and the nitrogen pressure in the mold cavity is regulated to 3MPa, and Under this pressure, maintain for 20 minutes;
[0063] In the fourth...
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Abstract
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