Production process of plastic packaging products

- May 03, 2018-

Production process of plastic packaging products


1, computer design: after the basic approval of the quotation, the customer will submit the requirement, the object or the sample of the plastic to the business department. The production scheduling will require the computer design department to scan the customer's object and combine the design of the printed product to make a graphic design drawing of the plastic products.


2, draw the sample: after the customer recognised the computer design draft, the production scheduling will decide which way to develop the mold (plaster mold, copper mold, aluminum mold) according to the complexity of the product. The development cycle is 3-5 days. The plastic sample is mostly plaster mold, and the operation steps are as follows: 1. first paste the object into shape with hand mud; 2. to shape the bubble shell hair on the suction plate machine; 3. to pour into the embryo of the bubble shell with the special gypsum plaster, and form the gypsum hair embryo after the air drying; 4. use the electric milling machine to make the gypsum hair embryo and the regular shape deep. Processing; 5. hand grinding and manual adding parts; 6. glue the polished plaster parts into the complete plaster mold; 7. then put into the complete sample of the plastic drawing machine, and 8. according to the finished size, hand cutting and sealing, complete the whole proofing process. If there is a need, the printing and typing department will also make the paper, adhesive, or color boxes used for the sample, and they will reflect the actual printing results with the full open digital proofing function.


3, production mold: samples approved by customers, usually a certain number of production orders. According to the complexity of production and plastic molding, the production scheduling will determine which mold production to adopt: using plaster mold production, the mold making process is similar to the plastic drawing, the advantage is that the production cycle is short and the cost is the lowest. The production of a 60X110cm mold is only one to two days, the deficiency lies in the absorption of the surface of the finished product. Rough, mold is easily broken in production, poor durability, unable to form deep, complex, thick sheet products. Using electroplated copper mould, the process is to spray a good layer of foam on the surface of the shell with a layer of conductive agent, and then put thick copper layer in the electrolyzer. The electroplating process takes 72 hours, then the copper mold should be cast in plaster (increase hardness), polishing and air treatment. The advantages of the electroplated copper mold production are the smooth surface of the plastic products. The cost is moderate and the durability is moderate. The drawback is that the mold manufacturing cycle is too long to complete the production of precision plastic products. Using plastic aluminum mold production, the mold production needs to use the computer design drawings first, and then CNC CNC milling machine. The advantage is that the production cycle is moderate, the later die processing time is short (the drilling air eye is finished in the CNC machining), the product dimension precision is high, the mould durability is strong, and the disadvantage is the high cost. Because the forming range of the fully automatic high speed plastic molding machine is about 66X110cm, so whether it is the plaster mold, the copper mold or the aluminum mold, it is necessary to put together a single mold together to reach the shape size. We all call this process a spelling, which needs to be spelled on the aluminum plate or board with a good air hole. It is the bottom mold. For a product with deep plastic molding, it is also necessary to make the upper mold. At the same time, the sheet vacuum is absorbed by the bottom die, the pressure is applied above the sheet, and the sheet is stretched evenly to each part, otherwise the thickness of the local thickness will be too thin. The entire production cycle of the production mold should be 5 to 7 days.


4, plastic molding production: using the full automatic high speed plastic molding machine production, the basic principle is: the rolled sheet into the oven to heat to soften the oven, and then pull the heat to the top of the plastic mold, the mold move and vacuum, the softened sheet adsorbed to the mold surface, and spray the cooling water spray in the shape of the molding. The sheet surface is hardened, and the molded sheet is automatically pulled to the storage bin. The pneumatic cutter will separate the molding from the unfinished sheet so as to complete the whole process. Most of the main quality problems arising from plastic products occur in this process: 1. plastic suction is not in place, is the shape of the deformation, not suck into the same shape as the mold product; 2. plastic excessive, is the product is too thin; 3. wire, refers to the molding product appears undue line marks; 4. uneven thickness. These problems need to be in good mold, debugging in place, including: the time of the sheet, the temperature and time of heating, the intensity and time of the vacuum, the position of the fall of the upper die, the time and depth, the placement of the mold in the plate, the addition of the accessories between the dies and so on.


5, punch processing: Blister molded large format products must pass through the punching machine, with a knife plate split into a single product. The principle is that there is a large plastic anvil on the bottom of the punching machine. The large plate forming product is placed on the anvil, and the finished tool die is stuck on a single product and a single finished product is cut through the motion of the punch. But the defect is that the cutting plate and the knife die are easily damaged, thus cutting the cutting plate. The edge is not smooth and has a rough edge. For high quality blister, it is necessary to use cold die (one male mold, one female mold) and cold punching machine.