Weld Line defect analysis and troubleshooting

Weld line, the most common of many defects in injection moulding products. Except for a few very simple injection molded parts, they occur on most injection molded parts (typically in the form of a line or V-groove), especially large complex items that require use of multi-gate molds and inserts. Main reason for weld line is that molten plastic encounters in the cavity when insert, hole, flow rate is inconsistent, or area where filling flow is interrupted, confluence of multiple melts occurs; when gate injection is filled, materials cannot be completely blended.


Analysis of common faults in hot runner system

Compared with ordinary flow channel molds, hot runner mould have significant advantages such as saving time and materials, high efficiency, and stable quality. However, its wide application has been affected by their failure in use. With technological advancement of mold industry, hot runner mould has made great progress in flow channel melt temperature control, structural reliability, hot runner component design and manufacture, which makes hot runner technology regain people's attention and favor.

Four standard development processes for injection moulding

Before drawing master assembly drawing, process drawing should be drawn and conformed to requirements of part drawing, process data. Size guaranteed by next process shall be marked with words "process size" on drawing. If no other machining is performed after molding except for repair of burrs, process diagram is exactly the same as workpiece drawing.

Quenching, tempering, normalizing, annealing, do you know clearly?

In order for metal workpiece to have required working properties, a heat treatment process is often necessary. Heat treatment process generally includes three processes of heating, heat preservation and cooling. It is divided into quenching, tempering, normalizing, annealing, etc. depending on process. Can you distinguish it? What is quenching? Quenching of steel is to heat steel to … Continue reading Quenching, tempering, normalizing, annealing, do you know clearly?

Advantages and disadvantages of 3d printed molds

3D printing has already had a huge impact on manufacturing industry. Hand pieces that used to cost a few hundred dollars and took a few weeks can now be designed in the morning, printed at night, and delivered to customers next morning. Some companies are already using 3D printing process to make injection molding mold. It is no longer necessary to spend months waiting for manufacture of mold that can be used for production, or because of downstream design changes that result in a large amount of money invested in modifying mold, or uncertainty in production layer. Whether it's mold validation or small batch production of injection molded parts, you can quickly print 3d printed molds. If there is a problem with mold or if you need to modify design, print one, repeat verification or production.

24 mold processing standards summarized by injection molding expert!

In order to ensure rationality and consistency of mold making process, optimize processing technology, and improve precision of mold making, each mold factory generally formulates process standards that suits its own mold factory. This article provides a standard for reference.

Injection molding mold cleaning requirements

Injection molding tool are the most important molding equipment for products made by injection moulding, and their quality is directly related to quality of products. Moreover, since mold occupies a large proportion in production cost of plastic injection molding factory, its service life directly affects cost of products made by injection moulding. Therefore, by improving quality of injection molding manufacturing process, maintaining it, and extending its life cycle, more products can be produced.

The world’s three advanced mold cooling technology

Advanced mold cooling technology, in addition to recent hot-selling water transport technology, there are many other technologies that are unfamiliar to everyone, but has been put into production. The most representative ones are: pulse cooling technology, CO2 gas cooling technology and nano fluid cooling technology.This article will focus on pulse cooling technology, CO2 gas cooling technology and conformal cooling technology analysis. Pulse cooling technology Pulse cooling technology was first … Continue reading The world’s three advanced mold cooling technology

Reasons for injection moulding defects

1. Material is wrong.2. Mold cavity size NG (shrinkage rate error, processing error)3. Mold cavity size is OK, unreasonable mold structure (number or position of gate, mold has no heating system or heating failure, uneven cooling), unreasonable product structure (deep cavity, thin wall, uneven wall thickness), unreasonable process parameters (holding pressure, sequence valve), injection molding machine (small tonnage, insufficient injection pressure)

Fifteen steps of molding design and design focus

A mold is an industrial product that shapes a material by a certain structure in a specific structure, and is also a production tool capable of mass-producing industrial product parts having a certain shape and size requirement. Large to airplanes, cars, small cups, nails, almost all industrial products must rely on molding. High precision, high consistency, and high productivity of parts produced by mold are unmatched by any other processing method. Molds largely determine quality, efficiency and new product development capabilities of product. Therefore, mold has honorary title of “Mother of Industry”.