“Tight tolerance” is a term that is often tossed around loosely in the industry—however, if tight tolerance is not done correctly, parts and products will underperform or possibly fail, resulting in customer dissatisfaction and a tooling and/or process overhaul. Other tight-tolerance benefits may include the elimination of secondary operations like machining, making it easier to procure mating parts, and allowing the possible conversion of metal parts to plastic—all of which help reduce costs.
In general, a typical tight tolerance for injection molding is +/-0.05mm. A very tight tolerance is +/-0.02. Major factors that impact tight tolerance include part design and complexity, material selection, tooling, and process design and control.
It is important to optimum quality plastic injection unscrew mold with correct assembly procedure and identification datum marking. Export tooling to Europe for cycle time of less than 20 seconds, ease of maintenance and reliable.
What is a Stack Mold?
The defining characteristic of a stack mold are the two (or more) mold parting surfaces or mold split lines. A stack mold does not require much more clamp force than a single face mold because the projected part surface areas of the cavities on both sides of the center block cancel out each others force.
Without increasing the machine platen size you can double the amount of cavities producing parts. Most stack molds have an equal number of the same cavities in each parting surface. For example, a 2+2 cavity grid mold with an 8+8 hotrunner produces four identical parts per cycle.
Some stack molds have different cavities in each mold parting surface and they produce a family of parts per shot, each different in shape and size.
Double Your Machine Output
Compared to conventional single-face molds, stack molds can virtually double the output of an injection molding machine by distributing the plastic melt into two or more separate mold parting surfaces
All parts are machined correct and clean, the work tools required are available and the workplace is well organized, before assembling the mold, all the components must be check and verified.
Mold assembly is one of the most critical steps of which all the parts machined or purchased need to be put together and required to be work functionality. Mold assembly job requires comprehensive understanding of mold structure. Quality of mold assembly determines the mold precision, injection productivity.
Double Injection, sometimes known as 2 material 2 shot molding or 2K molding, is an innovative manufacturing process used to produce complicated molded parts from two different materials. Through a highly specialized and automated process we carefully control the injection of multiple materials, including two different kinds of resin, into a single, multi-chambered mold.
Double Injection in performed on one machine that is programmed to perform two injections in one cycle. In the first cycle, a nozzle injects plastic into a mold. The mold is then automatically rotated and a different type of plastic is injected into the mold from a second nozzle.
Double Injection Molding optimizes co-polymerization of hard and soft materials to create powerful molecular bond. The result is a single part with production and feature advantages. It can be used for a variety of product designs across all industries. It also allows for molding using clear plastics, colored graphics and stylish finishes which improves your product functionality and marketplace value.
Double Injection advantages include:
Sheet matal can also be ovemolded by plastic. It is usual application on metal plastic combined nature in general application.
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