Under the leadership of our party, people’s living standards are getting better day by day, and the requirements for the quality of life have also been improved. An elegant and poetic electrical appliance enters the lives of thousands of people, especially the fragrant living rooms and whitewashed bedrooms of young people in the new era.
humidifier is positioned as a scholarly and poetic household product, so it should be mini and beautiful. In the injection molding production of water tank, elephant nose, base body, middle plate , these exterior parts must be beautifully designed, produced beautifully, brightly colored, and accurate in size.
Mr. Chen opened an electrical appliance assembly plant in Foshan. After injection, painting and printing, the final assembly was completed directly. In the past, humidifiers were made by fewer people, less competition, and good profits in the final assembly plant, so they were not so concerned about the production loss of injection molded parts. In the past two years, many people have done it, the product requirements have been strict, the unit price has not risen, but the cost of artificial materials has risen a lot.
During a small chat, Mr. Chen told me that under the guidance of his factory consultant, the production loss of his humidifier water tank was too great. In half a year, 50 tons of humidifiers were piled in the warehouse. Water tank material nozzle. Find a way to reduce 30% of the raw material loss in the injection molding production of the water tank.
I went to Mr. Chen’s factory for two full days to carefully understand and analyze the injection molding production of the entire humidifier water tank. Then he explained two classes to the relevant personnel of Mr. Chen's injection molding factory for a total of 4 hours: how to prevent the color difference, black spots, and spattering of the water tank.
The injection molding production problems of the water tank in their factory mainly focus on color difference, black spots, and material spatter. The humidifier water tank is generally made of SAN material, and this material is particularly prone to color difference and black spots.
The first step is to deepen the awareness of the cause of color difference for the on-site technicians.
Mold reasons for the formation of color difference in injection molded products
, high gas flow, poor burning, local 14span span14, poor burning temperature
2, the nozzle runner, the water is too small, and the plastic shearing heat is yellowish.
3, the temperature control of the hot runner is abnormal, and the plastic burns yellow poorly.
4,The cooling effect of mold water transportation is not good, the mold temperature is too high, and the product has sub-color difference.
The reason for the adjustment of the color difference of the injection molded product
1
2. The melt stroke is set improperly. If it is too long or too short, there will be chromatic aberration. The gap between 10 and 20 is qualified.
3. The back pressure of the melt glue is too high, and the melt glue turns yellow and has poor color.
4, the mold temperature is set too high, the product becomes substandard and the color difference.
5, the screw speed is too fast, the plastic shearing heats up and burns yellow and the color is different.
6. The product is stored in the sun, yellow, or white.
7, the product storage space temperature is too high, yellow, white.
8,The cycle is set too slow, the plastic stays in the barrel for too long, and it burns badly.
Design reasons for the color difference of injection molded products
1. There is too much color difference in the thickness of the product.
Injection molding products formed a color difference because of poor machine quality, three plastic parts are broken, because of poor machine quality _span _span _sp16 14 Burning yellow is poor.
2. The barrel temperature is unstable, and the temperature is too high to burn yellow.
3, melt glue back pressure valve control is not accurate, and the plastic burns yellow poorly.
4, the baking temperature of the material barrel is out of control, and the temperature is overheated and it burns yellow.
Material reasons for the formation of color difference in injection molded products
1,The plastic batch is different from the sample batch, the background color is different, and the color difference.
2. Toner and masterbatch are abnormal and produce color difference.
3, the nozzle material ratio is abnormal, and the color difference.
4, the nozzle material is too mixed and the color is poor.
5. When mixing the material, the color difference is caused by not strictly following the operation instructions.
6. The material has been drying for too long and it has been roasted yellow.
The second step, curing parameters, especially after the first part of the mold is turned on, no parameters are allowed to be baked on the span16.料温度。 Material temperature. Because of the chromatic aberration of SAN injection products, the material (spray, cold rubber) is directly related to these conditions. Whoever violates the rules and adjusts the conditions randomly will receive 200 points for each assessment.
The third step is to gradually change the toner and masterbatch raw materials to the same supplier for dyeing and pelletizing.The SAN raw material is cured into a blue-bottomed SAN material from the same supplier. Because dyeing and pelletizing will reduce the black spots and poor color difference caused by the non-diffusion of toner and color masterbatch; the performance of blue-bottomed SAN material is more flexible, and the product is not easy to be broken during injection molding.
The fourth step, the SAN material shutdown will produce black spots and must be passed. PP can’t be used after the machine, because the PP machine is used for the production of SAN transparent material, it will be mixed with white when it is restarted for production, which is not easy to remove, resulting in material loss.
The machine must be cleaned with ABS material when it is stopped, and the machine must be air-injected. After the plastic in the original barrel is completely discharged, the melt stroke should be lengthened by 50MM, the back pressure is 5bar, and the medium-pressure high-speed air-to-air injection is no less than 10 times. When the machine is stopped, the screw needs to be retracted 60MM.
Those who do not pass the machine as required are assessed for 200 points each time.
The fifth step is to strictly control the pollution of the nozzle material ; SAN must strictly implement the action of adding the dust collector according to the proportion of 8% each time after the material nozzle is broken. Violators will be assessed for 200 points/time.
The sixth step,When the SAN material injection molding production loss of the humidifier water tank is reduced from the original 30%, the relevant personnel shall be rewarded accordingly.
1. When it is reduced to 10%, the material room staff and technicians will receive 1,000 points per month, and the foremen and supervisors will award 2,000 points per month.
2. When it is reduced to 6%, the material room staff, technicians will receive 1500 points per month, and the foremen and supervisors will receive 3000 points per month.
3, when it is reduced to 2%, the material room staff, technicians will receive 2000 points per month, and the foremen and supervisors will receive 5000 points per month.
, who was in charge of the consultant who visited me at the same time in the span , Technicians, and material room personnel almost each send me a pack of cigarettes or a cigarette, which makes me very embarrassed...
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