TAIZHOU HEYA MOULD CO., LTD.

PLASTIC MOLDING PROCESS (2) - BLOW MOLDING Blow molding: the molten thermoplastic material extruded from the extruder is clamped into the mold, and then the air is blown into the raw material. The molten raw material expands under the action of air pressure, fits to the mold cavity wall, and finally cools to curing into the desired product shape.Blow molding is divided into two types of film blow molding and hollow blow molding: 1.Film blow molding：molten plastic is extruded from a circular thin tube in the annular gap of the die of the extruder head. At the same time, compressed air is blown into the inner cavity of the thin tube from the center hole of the head to blow the thin tube into a diameter larger tubular film (commonly known as bubble tube), take up after cooling.  2.Hollow blow molding is a secondary molding technology that uses gas pressure to blow the rubber-like parison closed in the mold cavity into a hollow product, and is a method for producing hollow plas

PLASTIC MOLDING PROCESS(1) 1. Injection molding Injection molding: The principle is to add granular or powdered raw materials to the hopper of the injection machine. The raw materials are melted and heated to a flowing state. The pouring system of the nozzle and the mold enters the mold cavity and hardens and sets in the mold cavity. Factors affecting injection molding quality: injection pressure, injection time, injection temperature. Process characteristics: Adva ntages: 1). Short molding cycle, high production efficiency and easy automation 2). Plastic parts with complex shapes, accurate dimensions, and metal or non-metal inserts can be formed 3). Stable product quality 4). Wide range of adaptation Shortcomings: 1). The price of injection molding equipment is relatively high 2). The injection mold has a complicated structure 3). The production cost is high, the production cycle is long, and it is not suitable for the production of plas

How to calculate the relationship between the size of the injection molded product and the molding cavity? In order to ensure that the structure of the injection molded product reaches the required size, considering the influence of the shrinkage of the injection molded product on its size, the cavity size of the molded product must be slightly larger than the actual size of the product when the mold is designed . How larger is more suitable, which can be calculated according to the following formula: A = B ×（1 + S）  A——The linear dimension of the mold cavity at room temperature, mm; B——The linear size of the product at room temperature, mm; S——Shrinkage of different raw materials (see table below).   Raw material shrinkage

GATE TYPE - INJECTION MOULD 1.Sprue gate 2.Edge gate 3. Fan gate .Overlap gate 4.Fan gate 5.Diapragm gate 6.Ring gate 7.Pin point gate 8.Submarine gate  9.Banana gate

   CLASSIFICATION OF MOULD [ Use points ]: A [Plastic mould] Plastic mould: used to manufacture plastic products . S uch as: 3C products [3C: Computer (Computer),   Communication (Communication), consumer electronics: (Consumer Electrics)] Automotive and motorcycle structural parts, interior parts, commodity , children's toys, PVC pipe fitting for construction, handles of various tools, precision instrument parts, etc. B [Pressing die] die (Pressed tooling): used to manufacture metal sheet metal, cutting and cutting of sheet materials, etc.   Such as:   Computers and other types of chassis, cabinets, stainless steel kitchenware, connector terminals, copper sheets for connectors, circuit board cutouts, sheet metal forming ,  etc. C [die casting mold] Die casting (alloy mould): mainly used for casting aluminum alloy, zinc alloy, magnesium alloy, etc.   S uch as notebook shells, automobile and motorcycle engines, speakers, valve body accessories, etc. D [Compressio

How to calculate the clamping pressure？ The relationship between "clamping pressure" and "projected area" and "plastic molding pressure" is as follows: <A> Projected area of finished product(cm2) ×<P> Plastic molding pressure(kg/cm2) =<F> Required clamping pressure(kg÷1000=t) 1. Case: one cavity finished product, ABS material. How much injection molding machine must be used? <A> Projected area: (18 × 12) + (10 × 8) = 296 cm2 <P> Plastics: ABS refers to the plastic molding pressure gauge on the following page, ABS = 400 kg / cm2 Calculation: Because A × P = F (the above program) <F> Therefore, 296 cm2 × 400 kg / cm2 = 118400 kg is converted into tons, it must be ÷ 1000, so 118400 ÷ 1000 = 118.4 tons (required clamping pressure) 2. Case: The shape and size of the finished product and the beer plastic material are as shown in the above figure. The output must be increased to two out of one. How mu