Difference between Extrusion Blow Molding and Injection Blow Molding Extrusion blow molding and injection blow molding is widly used to produce hollow products with small and big size. Most engineers and manufacturers in plastic industry may know very well for the difference between extrusion blow molding and injection blow molding. They can check very fast for a bottle or product how it is made or how to produce the kind of plastic containers or products.But as a layman,most people may be confused for how a product is made. Here we will talk about how the find out the differece of the extrusion blow molding process and injection blow molding process. Extrusion Blow Molding Process 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
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 →Plastic Blow Moulding Process There are different plastic blow moulding process to make a bottle. But what kind of technology should be chosen depends on the characteristics required. What are the exactly molding process? Here we will explain more details about them and their characteristics and comparison. Plastic Injection Blow Molding 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, injected 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 prisons to a blowing mold and use high pressure air to blow it up as a bottles or other hollowed containers. The injection blow moulding process is known as two steps injection blow molding and one step injection blow molding. Preforms whether cooled
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 →Advantages and Disadvantage of hot runner system Many customers ask us what is the advantages and disadvantage of hot runner system on plastic injection mold? Here we list some of the hot runner`s advantages and disadvantage for your information. ◆ Advantages of hot runner system (1) No nozzle material, no post-processing is required, so that the entire molding process is fully automated, saving working time and improving work efficiency. (2) The pressure loss is small. The temperature of the hot runner is equal to the temperature of the injection nozzle of the injection molding machine, which avoids the surface condensation of the raw material in the runner and the injection pressure loss is small. (3) The repeated use of nozzle materials will degrade the performance of plastics, and the use of hot runner system without nozzle materials can reduce the loss of raw materials and thus reduce product costs. The temperature and pressure in the cavity are uniform, the stress of the plastic parts is small, and the density is uniform. Under a lower injection pressure and a shorter molding
Read more →It is very important for PET preform Mould Lubrication System which have sufficient stiffness and strength. There are many factors should take care for a mold maker when starting a PET perform mould designs. The lubrication system of the mold plays a vital role in the PET preforms mould quality. It is the key in the PET preforms forming process. The material used for PET performs mould should be strictly select with considering their characteristic. Each part should be helpful for the mold gliding property, stability, accuracy, stiffness and strength, etc. There are two major categories for a mold making materials: metal and metal materials. The metal materials is mostly includes different no. of steel, aluminum alloy, etc. And the non-metallic materials are mainly have gypsum, cement, FRP, wood and so on. No matter what materials is used, but the preform mold must meet below requirements: 1. Reach the PET performs` accuracy of size. This is the basic rule you should keep in mind during the whole process of a PET preform mould design. 2. Make sure the mold have
Read more →Plastic mold is an abbreviation of molds includes compress molding, extrusion molding, injection molding, blow molding and low foam molding. It is a tool to make a fixed shape products with kinds of plastics. The tool is mostly have two parts called male mold and female mold. There is some empty space after the male mold and female mold closed. That is the plastic product`s shape. We put some melt plastic to fill the empty space and then we got a plastic part after it was cured. Please refer to below picture to help you understand the plastic mold definition. A series of plastic parts with different shapes and different sizes can be produce by changing the mold convex and concave molds and the auxiliary molding system. Plastic molds is the base factor of modern industry, and the release of new products will involve plastics parts. Plastic Mold Structure Plastic molds mainly includes a concave mold with a variable cavity composed of a concave mold combined substrate, a concave mold assembly and a concave mold combined card board, a convex
Read more →PET Bottle Blowing Troubleshooting is a skilled work needs lots of professional acknowledge on PET treatment process, bottle stretch blow molding machine and other auxiliary equipment. The production engineer should know much about PET preform treatment for the storage and tranportation, PET bottle blowing machine`s electronic circuit information,electrical diagram,hydraulic diagram, infrared heating system, compressed air drying system and other automatic controlling systems. Below we had listed the common pet bottle manufacturing defects and solutions of PET bottles blow molding for your checking. Feel Free to Contact Us if Any Questions
Read more →PET Preform Heating Temperature is about 75°C to 130°C on the preforms. So it will need to be adjusted according to the PET preforms` height, thickness, workshop indoor temperature, etc. A reheating step is then necessary to condition the preforms to the appropriate temperature distribution (slightly above the glass transition, which is typically ~75°C). This stage is generally performed using infrared (IR) heaters, taking advantage of the semi-transparent behavior of PET with regard to IR radiation. the objective function is reduced by 60% of its initial value after the first iteration, and by more than 80% at the end of the optimization process. Consequently, the thickness distribution of the formed bottle is 80% more uniformed after optimization. The algorithm converges after five iterations, which involves only 10 objective-function evaluations (that is to say, 10 FE simulations). On average, one cost-function evaluation requires 26 min CPU. Thus, the total CPU time required for the optimization is ~ 3 h 20 min. PET Preform reheat Temperature versus time inside and outside of the PET preforms for the oven configuration from publication. PET
Read more →It is important to select suitable models of plastic machinery for your plastic products. You will learn 7 proved procedures to choose right models of injection molding machines. Meanwhile, you will grasp 4 ways to calculate locking force of clamping units. You will be an expert in selection of models after minutes-reading. In general, most customers who have been in plastic industry for many years have the ability to select suitable model of plastic injection machines for their own projects. But sometimes, customers will require support from us, the manufacturers of plastic injection moulding machines to give suggestion on correct models of machines. Sometimes, customers only have samples in hand or just idea of new item in their brains, and then they need to be sure if our machines can make their new products or which model is best. And customer maybe require complete solution for efficient production. For example, for some special plastic parts, the production line will require accumulator, close loop, injection compress, etc. So, it is very critical to select right model of plastic injection machines. We
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