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What factors need to be considered when choosing a PVC injection molding machine?
To choose a PVC Injection Molding Machine, there are several important factors to consider. These include Process, Variables, Cost, and Challenges.
Process
The PVC injection molding machine works by injecting the plastic into a mold. The injection time is typically less than a second. The part's thickness and volume also play a role in determining the injection time. The injection speed must be controlled to prevent excessive shearing, which can lead to degradation of the product. A multi-stage injection speed control is generally used, with the injection speed starting low and increasing as the product diameter increases.
Once the product is placed in the mold, a circular runner is placed around the center of the mold. The diameter of the runner should be between 6 and 10mm. An ejector bar must be installed at the back half of the mold. It will then push the solidified part out of the mold's open cavity.
Variables
A PVC injection molding machine's performance is affected by a wide range of variables. The screw geometry, mold design, and shot size are just a few examples of these factors. In addition, machine size, shot size, and the exact conditions of the machine also have a large impact.
The most important variable to consider is the material temperature. It affects the quality of the final product. According to Taguchi's approach, the higher the S/N ratio, the higher the quality of the part. Other variables that may affect the quality of your parts include the mold temperature, the holding time, and the injection pressure.
Costs
The costs of PVC injection molding machines are dependent on several factors. The mold's size, features, and added services can all affect the price. A mold with 16 or 24 cavities will be more expensive than one with less cavities. Another factor determining mold price is the amount of precision required for each cavity. The higher the precision, the higher the mold price.
The machine must be able to produce various sized parts, which require larger molds and more injected material. As a result, the larger the mold, the higher the cost. Also, it is advisable to choose more shots than two. This will help to increase production speed and shorten time to market. Additionally, choosing a larger number of shots reduces tooling costs because fewer cycles are needed to produce the same number of parts.
Process
The PVC injection molding machine works by injecting the plastic into a mold. The injection time is typically less than a second. The part's thickness and volume also play a role in determining the injection time. The injection speed must be controlled to prevent excessive shearing, which can lead to degradation of the product. A multi-stage injection speed control is generally used, with the injection speed starting low and increasing as the product diameter increases.
Once the product is placed in the mold, a circular runner is placed around the center of the mold. The diameter of the runner should be between 6 and 10mm. An ejector bar must be installed at the back half of the mold. It will then push the solidified part out of the mold's open cavity.
Variables
A PVC injection molding machine's performance is affected by a wide range of variables. The screw geometry, mold design, and shot size are just a few examples of these factors. In addition, machine size, shot size, and the exact conditions of the machine also have a large impact.
The most important variable to consider is the material temperature. It affects the quality of the final product. According to Taguchi's approach, the higher the S/N ratio, the higher the quality of the part. Other variables that may affect the quality of your parts include the mold temperature, the holding time, and the injection pressure.
Costs
The costs of PVC injection molding machines are dependent on several factors. The mold's size, features, and added services can all affect the price. A mold with 16 or 24 cavities will be more expensive than one with less cavities. Another factor determining mold price is the amount of precision required for each cavity. The higher the precision, the higher the mold price.
The machine must be able to produce various sized parts, which require larger molds and more injected material. As a result, the larger the mold, the higher the cost. Also, it is advisable to choose more shots than two. This will help to increase production speed and shorten time to market. Additionally, choosing a larger number of shots reduces tooling costs because fewer cycles are needed to produce the same number of parts.
