PPS injection molding plastic resin
Poly phenylene sulfide, abbreviated as PPS, is a new type of engineering plastic, which is mainly divided into two categories: one is a branched thermoplastic polymer with a high viscosity, and the other is a thermosetting polymer which has a linear molecular structure before curing, and can be softened to a certain extent if sufficiently heated after curing. In the following, we will mainly introduce the thermosetting PPS. The Properties of PPS Physical Properties PPS is a white, highly crystalline polymer with a density of 1.34. It is characterized by excellent mechanical properties, with tensile strength and flexural strength superior to that of PA, PC, and PBT, etc. It possesses extremely high rigidity and resistance to creep, but high brittleness … Read more
Flash plastic injection molding defects
Flash, also known as flashing or burrs, mostly occurs between the matching parts of a mold, such as the parting surface of the mold, the sliding part of the slider, the clearance of the insert, and the gap of the ejector, etc. If the flashing is not resolved in a timely manner, it will be further worsened, so that the mold will be pressed to cause local collapses or other permanent damages. The flashing occurring in the clearance of the insert and the gap of the ejector will also cause the product to stick on the mold, thus affecting ejection. Flash is actually the excessive plastic material which enters the matching gaps of the mold and is attached to the … Read more
How to improve the life of plastic injection mold?
A plastic injection mold is one of the most important tooling for injection molding, whose quality directly determines the quality of the final product. In the meantime, the mold cost takes up a great proportion in the production cost of an injection molder. If the injection mold life is short and the precision is not well kept, not only will the product quality be affected, but also huge waste will be caused, including material waste and labor waste during plastic injection molding. Therefore, increasing the service life of injection mold has a significant impact on reducing the cost of plastic products, as well as improving tooling productivity and company competitiveness. During the plastic injection molding process, some plastics will decompose … Read more
A Comparison of the HDPE, LDPE and LLDPE Resins
This article is to analyze the engineering application scope, the respective characteristics of their applications and the application scope of HDPE, LDPE and LLDPE resin materials from the aspects of raw material, molecular structure, density, crystallinity, softening point, corrosion resistance, temperature range, mechanical properties, tensile strength, elongation at break, resistance to environmental stress cracking, industrial production principles, processes and additives, etc. As one of the five commonly used synthetic resins, polyethylene is a synthetic resin that boasts the largest production capacity and the highest import volume in China. At present, China is already the largest importer and the second largest consumer of polyethylene in the whole world. Polyethylene is a mixture of ethylene monomers, while polyethylene plastic is a plastic … Read more
Sink Marks Injection Molding Defects
The dents and hollows on the surface of a plastic product are referred to as “sink marks”. In addition to the appearance of the product, sink marks also affect the quality and strength of the final product. The reasons for sink marks are related to molding processing, mold design and the choice of the plastic material. Raw Material The shrinkage rates of different plastic materials are different. Usually, the raw materials that are prone to sink marks are crystalline, such as nylon. During the injection molding process, the crystalline plastic is heated to a fluid state, with the molecules randomly arranged; when filled into the cold cavity, the plastic molecules are slowly arranged neatly to crystallize. As a result, the … Read more
How much does injection molding cost?
The cost of injection molding is influenced by a multitude of factors, but is mainly comprised of the following: Raw material cost – This cost is quite easy to be calculated. Ask the raw plastic material supplier how much 1kg costs, multiply the product weight by 3% of loss rate, and then multiply the raw material price to get the cost of the raw material; Machine cost – Regarding this cost, ask a plastic injection molding factory what the hourly processing rates of different plastic injection molding machines are? Assume that the processing cost per hour for a 100-ton plastic injection molding machine is 60 RMB/hour, then the cost per minute is 1 RMB; at this point, it is necessary … Read more
Rapid prototyping play a very important role in China product development
Study shows that 80% of the production cost is determined at the design stage. Therefore, the design stage is of great importance to product cost control. Rapid prototyping constitutes an important part in the industrial design process. From the fully manual prototyping (hand sampling) to the semi-mechanical prototyping, then to the modern 3D printing of prototypes, the progress epitomes the technological progress of the modern manufacturing industry. Among them, though Rapid prototyping is an advanced supportive design technique, it doesn’t receive enough attention. It has been proved th Rapid prototyping not only plays a very important role in product design decision, but is also an effective tool for protecting product information and marketing. Now, let’s talk about the importance of … Read more
Different mold cooling channel design cause different cooling effect
Many believes that the special-shaped cooling channel is not effective at all, but is a kind of deceptive technology! As a matter of fact, the point is not that the special-shaped cooling channel is not effective, but where you choose to place the cooling channel is still arguable. Let’s take a look at the example below: Figure 1 shows the same part, coming with special-shaped cooling channels designed by different designers. Although all of them adopt the special-shaped design, they perform differently with regard to mold temperature improvement. See Figure 2, let’s verify this using the CAE software. We can find that some of the designs give a great performance as shown in Figure 4, but some others are not … Read more
Types of Food Grade Plastic Materials
PET PET Usually, this plastic is used in the production of plastic bottles, beverage bottles and the like. The plastic water bottles and carbonated beverage bottles people often buy are packaging products made from PET, which is a food-grade safe plastic material. Potential Risks: PET is only suitable for the packaging of room temperature or cold drinks, rather than overheated food. If the temperature is too high, the bottle will release toxic substances, which may cause cancer. If the PET bottle is in service for a long time, it will automatically release toxic substances, so the plastic beverage bottles should be disposed right away after use, and should not be used to contain other foods for a long time, so … Read more
How to control the cost of plastic injection molding?
The cost control of plastic injection molding also involves many factors. It must be controlled from the equipment, application process, raw material, as well as management and technology to achieve the optimal efficiency at the lowest cost. Tools and Components Control: Tools – All screws, nuts, nylon hoses and hose clamps, etc. in the packaging workshop must be controlled with a corresponding method, or great waste will be caused! Mold Application Control: Production Process: Appropriate clamping pressure during the adjustment process – It is appropriate as long as the product meets the requirements, and the clamping force is able to ensure that the injection pressure does not force the core and the cavity open to cause flashing. The ejection … Read more