Most Chinese injection mould companies are clustered around Guangdong province and Zhejiang providence. But, how can we choose the most suitable injecton mould maker from so many companies and factories?
We can choose from the following aspects:
Have a correct mold flow analysis before the whole mold design is very necessary.
And second, you can start your design, which must be based on the customer’s actual requirements. A reasonable design will help a lot to the following workflow.
And also, a good precious mold tooling is the very key to the quality of plastic injection moulding products. Because if the injection moulds have some problems, and that will directly reflected on the plastic products.
Injection-molded tube technology is reportedly less expensive and capable of overcoming many limitations of traditional techniques. SOC Co., Ltd claims it can now make multi-dose plastic squeeze tubes with novel shapes and profiles in attention-getting designs with innovative decorating options, including textured and embossed surfaces, plus injection label and integral closures. They work with resins with enhanced performance benefits such as excellent barrier properties, moldability in long, thin-wall shapes and sealability.
Before the parison cools down, a hollow ramrod is injected into its center and pushed to the top of the mold, stretching out the warm plastic preform as it goes. Compressed air is then forced out in controlled low-pressure stages through the hollow ramrod. The plastic form is forced out to the sides of the mold. Because the stretching is performed evenly, the plastic remains uniformly thin and strong. The soda bottle assumes the shape of the mold and is dropped out of the blow molding machine as the two mold halves separate. A new parison is extruded and the entire blow molding process begins again. The actual manufacture of a soda bottle takes only a few seconds.
Since the introduction of bottled water into the market in the 90′s, it has become a household norm. Blow molding a two-liter soda bottle requires a preformed piece called a parison. The parison is mechanically loaded onto a stand and two sides of a bottle-shaped metal mold come together around it and is usually extruded from a plastic injection mouldplaced very close to the blow molding machine. The warm parison looks like an upside-down plastic test tube, with a preformed collar and threads for the cap at the bottom.
We can choose from the following aspects:
It is very necessary to have a correct mold flow analysis before the whole mold design. Second, you can start your design, which must be based on the customer’s actual requirements. A reasonable design will help a lot to the following workflow.
And also, a good precious mold tooling is the very key to the quality of injection mold products. Because if the injection mold have some problems, and that will directly reflected on the plastic products.
The design purpose of injection process regulation is to make these negative influences ineffective, and thus to attain an even higher reproducibility of the parts.
The dicisive factor for all quality features that are concerned with dimension and weight is the internal pressure of the mould. Constant maintenance of this pressure curve in every cycle guarantees uniformity of the quality of injection moulded parts. If the mould internal pressure curve is maintained at a constant, all of the negative factors mentioned above are compensated.
During plastic injection moulding without injection process regulation, a specified pressure curve is established for injection and holding pressure, which can also be maintained with assurance with a regulated machine. However, the mould internal pressure curve that arises can only be assumed. Pressure losses through the runner manifold as well as the mould specific filling behavior cannot be identified.
With the application of injection process regulation, the mould internal pressure is first measured and compared with a nominal value. If there is a deviation, a hydraulic valve that applies pressure to the injection cylinder is actuated. It is thus possible to follow the nominal value precisely and independently of negative factors. The switch over from injection to holding pressure also occurs as a function of internal pressure. Thus, no pressure spikes can occur since the switch over takes place when a specified threshold value is reached.
An injection mould tool has two major purposes:
1. It is the cavity into which the molten plastic is injected.
2. The surface of the tool acts as a heat exchanger, as the injected material solidifies with contact.
Injection mould designs differ depending on the type of material and component being moulded. Mould tool design and component design are equally important considerations for success. Component design is beyond the scope of this book but the various tooling, gating, temperature control and ejection systems that make up the mould tool will be considered here. After parts are injection moulded they must be ejected. A variety of mechanisms can be employed such as ejector pins, sleeves, plates or rings.