The plastic product recycling symbol was formulated in 1988 by the Society of the Plastics Industry (now renamed Plastics Industry Association). This set of logos stamps plastic material identification codes on containers or packaging materials, plastic recycling numbers 1 to 7, so that people can simply join the ranks of recycling without having much work to learn the similarities and differences of various plastic materials. Every plastic container has a plastic recycling symbol, usually at the bottom of the plastic containers. Each number represents a kind of plastic container. They are made of different materials, and there are also different contraindications. The recycling mark is also a health certificate The plastic recycling symbol is a triangle symbol, usually at the bottom of the plastic container. There are numbers from 1 to 7 in the triangle. Each number represents a different material. Therefore, the different numbers in the recycling mark indicate which resin the product is made of. If the product is made of several different materials, What is marked is the main and basic materials of the product. Remember,
Read more →There are thousands of plastic injection mold makers in China today. It makes lots of people confused about how to choose a plastic mold maker correctly or to pick up the right mold supplier for your project. Here are some guidelines you should know to help you out with the problem. 1st of all, we must know our requirements for the exact product for the project. Then we can sort out how to choose a right mold maker to manufacture our mold. Here we simply list the key points for different grand mold manufacturers as below: 1. Top Grand Injection Mold Manufacturers: A professional injection mold manufacturer has an experienced team for mold design, manufacturing, quality control, inspection, and many top machines in the industry. Including but no only: high-speed CNC lathes, CNC milling machine, CNC machining centers, mirror spark machines, slow-moving wire, precision grinders, high precision injection molding machines, two-dimensional, three-dimensional testing equipment, etc. It is suitable for molds with complete surface treatment, perfect interface, flawless product assembly, reasonable and standardized internal structure, and mold tolerance of about 0.02mm.
Read more →Difference Between Three-plate Mold and Two-plate Mold The three-plate mold refers to a set of mold blanks consisting of A plate, B plate, and nozzle stripping plate; the two-plate mold batch is composed of A plate and B plate. The difference between the three-plate mold and the two-plate mold is that there is a nozzle stripper. From the perspective of mold structure, the guide posts of the three-plate mold are in the front mold, and the guide posts of the two-plate mold are in the rear mold. From the point of view of use, products with a glue inlet (fine nozzle) feeding method use a three-plate mold; while plastic products with a large nozzle feeding method use a two-plate mold. Three-plate mold structure description: The spout edge nail cooperates with the guide sleeve, and then the front mold is guided (the straightening spout plate panel A plate). Secondly, the spout edge nail is not added with a guide sleeve on the entire rear mold, and the template is avoided. Therefore, the spout nail only guides the front mold, while the
Read more →Injection Stretch Blow Moulding Process Injection stretch blow moulding process is best known for manufacturing high quality and high clarity products. Exactly it`s PET water bottles. And of caused some other products are using the same molding process, like baby feeding bottles, outdoor drinking water bottles,cosmetic bottles,etc. The injection stretch blow molding process includes below 2 process: 1. Injection molding process: The raw material is heat and melt with a screw and barrel,and then injection to a preform injection mold. 2. Stretch and blow molding process: The preform is transferred to a blow mold before it`s cooled or reheated to the glass transition temperature for stretching, Then it was stretched in axial direction with a stretch rod, then release compressed air into the preform to force against the inside of the blowing mold, when it was cooled we have the mold shape products. Some people may be confused with the injection blow molding process and injection stretch blow molding process. Just noted there is only one different thing: stretching process. Injection stretch blow molding means the preforms must be stretched
Read more →Plastic Extrusion Blow Molding Process Extrusion blow moulding process is the largest and the earliest type of blow molding method. It is used to create hollow plastic products. It is suitable for the blow molding of polymers such as PE, PP, PVC, thermoplastic engineering plastics and thermoplastic elastomers, and various plastic blends. Used to produce packaging containers, storage tanks and other industrial parts. Extrusion blow molding process is start from the material is melted and plasticized in the barrel. And then extruded from the head of the extruder with conventional downward tube. When the hube parison reaches a predetermined length, a section of tube embryo is intercepted and placed in the blow mold while still hot. The mould is closed catching and holding the neck end open and pinching the bottom end closed. the compressed air blown into the parison through the air blowing nozzle The tube prison will be precisely inflated as the desired shape of the mold cavity. After the mould is completely cooled and then the mold can be opened to take out the product. Advantage and
Read more →Plastic Injection Blow Moulding Process Injection blow moulding process can be separated as injection moulding process and blow moulding process. 1. Injection moulding process: The injection molding is finished by an injection molding unit or machine. In this process we will produce a semi-finished product called preform or parison. Raw material is melt in a barrel and feed to the nozzles, injection to a injection mold, then we have the perform with kinds of bottle neck types. 2. Blow Moulding process: The blow molding is we put the performs or parisons to a blowing mold and use high pressure air to blow it up as a bottles or other hollowed containers. Now you know exactly two steps injection blow moulding process. And you can see we will need two main machines: injection molding machine and blow molding machine. It is a bit comples to produce a bottle or container but running very fast and have huge output capacity. This two step injection molding process is mostly use for PET bottles and containers manufacturing (Water bottles, soft drink bottles, edible oil
Read more →Plastic PA6 Injection Molding Process Settings Barrel temperature: Feeding area 60～90°C (70°C) Zone 1 230 to 240 ° C (240 ° C) Zone 2 230 to 240 ° C (240 ° C) Zone 3 240 ~ 250 ° C (250 ° C) Zone 4 240 ~ 250 ° C (250 ° C) Zone 5 240 ~ 250 ° C (250 ° C) Nozzle 230 ~ 240 ° C (250 ° C) The temperature in parentheses is recommended as the basic set value, the stroke utilization is 35% and 65%, and the ratio of module flow length to wall thickness is 50:1 to 100:1. Feed zone and zone 1 temperature directly affect feed efficiency, increasing these temperatures can make feed more even Melt temperature: 240 ~ 250 ° C Barrel constant temperature: 220 ° C Mold temperature: 60 ~ 100 ° C Injection pressure: 100 ~ 160MPa (1000 ~ 1600bar), if you are processing thin section long channel products (such as wire tie), you need to reach 180MPa (1800bar) Holding pressure: 50% of the injection pressure; due to the relatively fast
Read more →Plasticized polyvinyl chloride (P-PVC) Barrel temperature: feeding zone: 30～50°C (50°C) Zone 1: 140 ~ 160 ° C (150 ° C) Zone 2: 150 to 180 ° C (165 ° C) Zone 3: 160 ~ 220 ° C (180 ° C) Zone 4: 160 ~ 220 ° C (190 ° C) Zone 5: 160 ~ 220 ° C (190 ° C) Nozzle: 160～220°C (200°C) The temperature in parentheses is recommended as the basic set value, the stroke utilization is 35% and 65%, and the ratio of module flow length to wall thickness is 50:1 to 100:1. Melt temperature: 200 ~ 220 ° C Barrel constant temperature: 120 ° C Mold temperature: 30 ~ 50 ° C Injection pressure: 80 ~ 120MPa (800 ~ 1200bar) Holding pressure: 30% to 60% of injection pressure Back pressure: 5～10MPa (50～100bar) Injection speed: In order to obtain a good surface quality, the injection should not be too fast (multi-stage injection if necessary) Screw speed: set the medium screw speed, the maximum folding line speed is 0.5m / s Measuring stroke: 1.0 ~ 3.5D Residual amount: 2
Read more →Plastic PVC-U Injection Molding Process Settings PVC – unplasticized (PVC-U) Barrel Heating temperature: feeding zone: 30～50°C (50°C) Zone 1: 140 ~ 160 ° C (150 ° C) Zone 2: 165 ~ 180 ° C (170 ° C) Zone 3: 180 ~ 210 ° C (190 ° C) Zone 4: 180 ~ 210 ° C (200 ° C) Zone 5: 180～210°C (200°C) Nozzle: 180～210°C (200°C) The temperature in parentheses is recommended as the basic set value, the stroke utilization is 35% and 65%, and the ratio of module flow length to wall thickness is 50:1 to 100:1. Melt temperature: 210 ~ 220 ° C Barrel constant temperature: 120 ° C Mold temperature: 30 ~ 60 ° C Injection pressure: 80 ~ 160MPa (800 ~ 1600bar) Holding pressure: can not be set too high, 40 to 60% of injection pressure, based on modules and gates Back pressure: Due to its thermal sensitivity, it is critical to set the back pressure correctly; the heat generated by the screw friction (closed heat input control) is better than the heat generated from the barrel heating
Read more →Plastic PS Injection Molding Process Settings Polystyrene (PS) Heating Temperature: Barrel temperature feeding zone: 30～50°C (50°C) Zone 1: 160 ~ 250 ° C (200 ° C) Zone 2: 200 ~ 300 ° C (210 ° C) Zone 3: 220 ~ 300 ° C (230 ° C) Zone 4: 220～300°C (230°C) District 5: 220 ~ 300 ° C (230 ° C) Nozzle: 220 ~ 300 ° C (230 ° C) The temperature in parentheses is recommended as the basic set value, the stroke utilization is 35% and 65%, and the ratio of module flow length to wall thickness is 50:1 to 100:1. Melt temperature: 220 ~ 280 ° C Barrel constant temperature: 220 ° C Mold temperature: 15 ~ 50 ° C Injection pressure: has good flow performance, avoiding excessive injection pressure of 80 ~ 140MPa (800 ~ 1400bar) Holding pressure: 30% to 60% of injection pressure; relatively short holding time Back pressure: 5～10MPa (50～100bar); in the place where the back pressure is too low, bubbles are easily generated in the melt (there are gray and black lines in the product)
Read more →Plastic PP Injection Molding Process Settings Polypropylene (PP) Heating Temperature: Barrel temperature feeding zone 30～50°C (50°C) Zone 1 160 ~ 250 ° C (200 ° C) Zone 2 200～300°C (220°C) Zone 3 220 ~ 300 ° C (240 ° C) Zone 4 220 ~ 300 ° C (240 ° C) District 5 220 ~ 300 ° C (240 ° C) Nozzle 220 ~ 300 ° C (240 ° C) The temperature in parentheses is recommended as the basic set value, the stroke utilization is 35% and 65%, and the ratio of module flow length to wall thickness is 50:1 to 100:1. Melt temperature: 220 ~ 280 ° C Barrel constant temperature: 220 ° C Mold temperature: 20 ~ 70 ° C Injection pressure: has good flow performance, avoiding excessive injection pressure of 80 ~ 140MPa (800 ~ 1400bar); Except for some thin-walled packaging containers, it can reach 180MPa (1800bar) Holding pressure: avoiding the shrinkage of the product, it takes a long time to hold the product (about 30% of the cycle time); about 30% to 60% of the injection pressure
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