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PET injection molding machine is an injection molding machine designed according to the characteristics of PET materials and products. The modern plastic bottle industry is constantly changing, and the market requires efficient, hygienic, versatile and flexible PET preform injection molding machines to meet the production requirements of manufacturers. As a professional PET injection molding machine manufacturer, we will give you 8 tips to choose the most suitable PET injection molding machine for your business.
1. Screw.
For screw aspect ratio, special PET screw is designed. Generally, the aspect ratio of plastic screw is about 18-22. The aspect ratio of PET screw is generally above 1:24. The larger the aspect ratio, the better the plasticizing ability.
2. Mold space.
Judging by the size of the mold, the inner distance of the large column, the thickness of the mold, the minimum size of the mold and the size of the template are suitable to confirm whether the mold can be placed. The width and height of the mold should be smaller than or at least one side is smaller than the inner distance of the large column; The width and height of the mold should preferably be within the size range of the template; The thickness of the mold should be between the thickness of the injection molding machine; The width and height of the mold should be Complies with the recommended minimum mold size for PET injection molding machines.
3. Product take-out space.
It is determined by the mold and the finished product whether the mold opening stroke and the mold supporting stroke are sufficient for the finished product to be taken out. The mold opening stroke must be at least twice the height of the finished product in the direction of opening and closing the mold; the mold supporting stroke and mold supporting force must be sufficient to eject the finished product.
4. Clamping force
The tonnage of the clamping force of the machine is determined by the product and the plastic. When the raw material is injected into the mold cavity at high pressure, a mold-pulling force will be generated, so the clamping unit of the injection molding machine must provide enough clamping force to prevent the mold from being stretched. The clamping force requirement is calculated as follows:
Calculate the projected area of &#;&#;the finished product in the direction of the opening and closing die from the appearance size of the finished product;
Supporting mold force = the projected area of &#;&#;the finished product in the direction of opening and closing the mold (cm2) × the number of mold cavities × the pressure in the mold (kg/cm2);
The clamping force of the machine needs to be greater than the clamping force of the die, and for the sake of safety, the clamping force of the machine usually needs to be more than 1.17 times the clamping force of the die.
Preliminarily determine the specifications of the clamping unit and roughly determine the tonnage of the PET machine, and then the following steps must be performed to confirm which injection unit has a more suitable screw diameter.
5. Injection volume
Determine the required "shot volume" and select the appropriate "screw diameter" from the weight of the finished product and the number of cavities. The number of mold cavities (one mold several cavities) should be considered when calculating the weight of the finished product; for the sake of stability, the injection volume should be more than 1.35 times the weight of the finished product, that is, the weight of the finished product should be within 75% of the injection volume.
6. Forming effect
Conditions such as "screw compression ratio" and "injection pressure" are determined from PET plastic. PET plastic needs good plasticizing ability and suitable screw compression ratio design to have a good molding effect. Therefore, in order to make the finished product injection better, the plasticizing demand and compression ratio must also be considered when selecting the screw.
7. Increase the storage motor
PET plastic is easy to stick and the molding temperature is high, which requires a large screw torque, and a storage motor that is two or more stages larger than ordinary machines is often selected to meet the needs of the machine.
8. Increase the power system.
The storage motor increases the screw speed and reduces the speed of the screw. When the storage motor is enlarged, the power system is also increased to ensure more stable operation of the machine and shorten the product cycle time. There are some special issues that may also have to be considered:
Contact us to discuss your requirements of Plastic Bottle Moulding Machine. Our experienced sales team can help you identify the options that best suit your needs.
In some special cases, the customer's mold or product may have a small mold but a large amount of shots, or a large mold but a small amount of shots. In this case, the standard specifications set by the manufacturer may not be able to In line with customer needs, there is a mismatch in injection volume and volume.
In this case the following two occur:
Using the original standard clamping unit with a smaller injection screw
Use the original standard clamping unit with a larger injection screw.
Of course, there may be several levels of difference between clamping and injection.
In addition, it is necessary to consider the mold waterway to improve the cooling efficiency of the mold. The PET mold is equipped with a special PET water dividing block.
PET injection molding machine, as an important injection molding machine category, is very competitive in the market. There is no doubt that choosing the right PET injection molding machine has a huge impact on your business. Hope this article is helpful to you.
LOG Machine is a leading PET injection molding machine manufacturer in China, if you have questions or are looking for a suitable injection molding machine, please contact us!
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There are four distinct blow molding processes that use heated liquid plastic to create hollow objects, like bottles or other packaging. Pressure forces the material into a mold cavity, which gives the object its hollow shape. At Drug Plastics, we use all four distinct blow molding processes to manufacture our products: Extrusion Blow Molding (EBM), Compression Blow Molding (CBM), Injection Blow Molding (IBM), and Injection Stretch Blow Molding (ISBM).
In general, the size and geometry of the bottle and the type of plastic resin being used determine the best manufacturing process. We leverage our knowledge acquired from over 60 years of bottle making to choose the optimal blow molding process for every product we produce. Drug Plastics commits to deliver perfect bottles each and every time.
We believe it&#;s important for our customers to understand the primary differences between molding processes. Why? Because understanding how we manufacture our products will help you make more informed decisions about your plastic packaging. Let&#;s review the differences between the four distinct blow molding processes. Read further or watch our video to learn more. Each process starts the same way &#; with pellets of plastic resin.
In the EBM process, we extrude the heated resin to form a parison. The parison is a vertical tube-like piece of plastic through which compressed air can pass. A two-part mold closes on the parison from both sides. A blow pin is inserted into the neck area of the bottle that blows air into it when sealing the mold. The air pressure makes the parison conform to the shape of the mold, including the threads in the neck portion of the mold.
The mold is cooled, and the bottom of the parison is trimmed. The mold opens and the bottle is placed on a conveyor belt, the top (typically dome-shaped) is trimmed, leaving the finished bottle. The EBM process is used to manufacture large-size, High Density Polyethylene (HDPE), Low Density Polyethylene (LDPE), and Polypropylene (PP) bottles with large necks.
CBM is a specialized form of extrusion molding. In CBM, the blow pin not only blows air into the parison so the plastic conforms to the shape of the bottle, but it also uses physical pressure to force the plastic into the neck area of the mold. This results in increased thread definition and precise bore tolerance.
Bottles with medium to large blow-up ratios are produced using CBM. The blow-up ratio is the comparison between the diameter of the neck of the bottle and the diameter of the body of the bottle. Bottles with large blowup ratios typically have large bodies and relatively small necks. The CBM process can be used to manufacture bottles that are made with HDPE, LDPE, and PP resin, and can achieve very tight critical neck dimensions.
The EBM and CBM processes also allow the weight of the bottle to be adjusted. This is done by controlling the amount of plastic in the parison. This is ideal when the contents of the filled bottle require a thicker wall, or as a conscious effort to conserve raw materials by reducing the amount of plastic. The EBM and CBM processes are also used when a bottle has multiple plastic layers (outside and inside); and when a transparent window stripe is needed to allow for determining the amount of product remaining in the bottle.
During the IBM process, the heated resin is injected into the mold using a long screw. This injected plastic is molded into a preform, then air is used to blow the preform into the shape of the mold. The mold is cooled and the bottle is placed on a conveyor belt after being ejected from the mold.
This process is ideal for the production of HDPE, LDPE, and PP bottles with a small to medium blowup ratio. Bottles with small blow-up ratios typically have small bodies and relatively small necks. IBM is used when manufacturing bottles with very tight neck tolerances.
During the ISBM process, the heated resin is injected into the machine using a long screw. This injected plastic is then molded into a preform.
Next, the preform is conditioned and prepared for stretching. The preform is stretched as air is used to blow it into the shape of the mold. The stretching of the preform increases the barrier properties of the PET bottle. The mold is cooled and the bottle is placed on a conveyor belt after being ejected from the mold. ISBM is typically used for bottles with small to medium blow-up ratios. We use ISBM to manufacture all of our Polyethylene Terephthalate (PET) bottles.
We are also proud to have our own mold-making facility. There are instances when a customer wants custom designed packaging for their brand &#; that&#;s our specialty. Our team can design, fabricate, maintain, and repair our own molds. From unit-cavity prototype molds through multi-cavity production molds, we build the highest precision tools using high-grade materials and proprietary technologies developed in-house. This ensures that our molds produce a consistent product, perform exceedingly well under high production demands, and work on all of the relevant blow molding machines. Our team will take the time to work with you to determine the best solution for your packaging challenges. For those times when quick production-ready solutions are needed, Drug Plastics offers a large selection of stock bottles in our inventory.
Whether you are looking for plastic packaging for a new product, or if you want to enhance your brands&#; existing packaging, we can help. Our plastic bottles are used worldwide to package prescription drugs, over-the-counter medications, vitamins, supplements, and cannabis products. When you work with us, we will recommend the best blow molding process to make your bottle. Our goal is to manufacture defect-free packaging every time, no exceptions. Ready to discuss your packaging? Call 610-367- to get in touch with a knowledgeable team member.
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