Plastic is a material which very sensitive to temperature. Previously in properties of plastic, we have discussed important plastic characteristics which are related to the same. In a molding process, the temperature of plastic is well controlled from drying, transporting, melting (the injection molding machine heat the raw material up to process range), and of… Continue reading
Author Archives → Andrew Chiang
C-2-Ejection
During molding process, the part shall be able to be taken out smoothly after mold open. In doing so, the part maybe damaged since it is still stick on the moving side of mold after mold open in most mold design. Since the melt plastic starts to cool down after it is being injected into… Continue reading
C-1-Mold Concept
Injection molding process needs 3 major elements: raw material, injection molding machine, and mold. The process basically is that Injection molding machine melts raw material and inject it into mold, the mold opened, and we get the part. The purpose of mold is to form the melt plastic to the shape of part. It could… Continue reading
B-7-Plastic Properties
Here discuss 4 plastic characteristics which being mostly considered in product/process development, and how they affects through out the entire product life cycle. Note: Polymer manufacturer shall provide these information. 4 Temperature Each kind of plastic behaves differently when at 4 different temperature This information help designer to decide injection molding equipment/tool/plastic raw material. This… Continue reading
B-6-Common Plastic Issues
As any manufacturing process, defects can happen and negatively affect your product quality and productivity. To help you avoid this problem and create consistently great products, here discusses 35 different kinds of common plastic part issues (see table-1), their background and possible countermeasure. Before start identifying the issues, it is suggested to complete following actions… Continue reading
B-5-Different polymers and their characteristics
Resin and polymer are organic materials. The key difference between resin and polymer is that resins have small molecular weights, whereas polymers have large molecular weights. Polymers can be divided into 2 major categories: This site we discuss thermoplastic are commonly used in injection molding process. Each plastic model from different supplier can have different… Continue reading
B-4-Ribs
Rib is a kind of mechanical profile which is very common to be seen in plastic part design. Most of the time, the purpose of rib is to increase the strength of plastic part. See illustration of rib in Pic.-1 and 2. While rib is only necessary under the scenario when the area need more… Continue reading
B-3-Wall Thickness
Wall thickness could be measured by parts cross section. Depending on part design, a single part could have many different wall thicknesses. For injection molding part, there are some suggestion regarding wall thickness for a better surface finish and easier production. Too much wall thickness Plastic expends when temperature goes up and shrinks when temperature… Continue reading
B-2-Tolerance
Plastic parts will never be the 100% same as the CAD design, since part geometry, material characteristics (raw material expands and contracts according to thermal difference), mold construction (CNC machining), processing variability…etc. Therefore, to indicate the area of the part that shall follow the CAD design and the allowed difference is very important. The allowed… Continue reading
B-1-Design Preparation
There are many ways to produce products, why choose “plastic injection molding” ?? I see 3 reasons below after comparing several manufacturing processes: Here are some principles (not limited) I will consider during design stage if we decide to produce a part with plastic injection molding process, many factors affect plastic-part design. Among these factors… Continue reading
A-5-Exhibition Preparation
Participate in exhibition is a very interesting experience, it gave me chances to traveled to many countries, meet different people, food ,and culture. Exhibition is an assembly at particular time and place by people who are in common in particular aspect, it is a chance for participants to know each other and get very much… Continue reading
A-4-Supplier Management
An automotive consisted of thousands of parts such as engine, transmission system, steel frame, and many plastic parts……etc. These parts could not be manufactured by a single company, but hundreds of suppliers. If a party generates trouble, everybody would be in trouble, good supplier management is really mattering to the project and industry. The major… Continue reading