-
-
Products
-
-
-
-
Detailed
Basic Knowledge of Plastic Kits
Time:
2023-01-09 10:38
Author:
Web scraping
The plastic component design should be as successful as possible. For areas where reliability is difficult to ensure—such as those prone to feeding difficulties in the mold or easy ejection issues during mold correction—consider pre‑providing a slight clearance for the molded part.
Plastic kit The design should be as successful as possible. For areas where reliability is difficult to ensure—such as cases where mold feeding is challenging or part ejection becomes problematic during mold modification—consider pre‑providing a slight clearance in the molded part.
Commonly used plastics include ABS, AS, PC, PMMA, PS, HIPS, PP, and POM. Among these, the frequently employed transparent plastics are PC, PMMA, PS, and AS. The housings of high-end electronic products typically use ABS+PC; display panels are made of PC, and if PMMA is used, it requires a surface hardening treatment. HIPS and ABS are primarily used for the housings of everyday consumer electronics. Due to its excellent aging resistance, HIPS is increasingly replacing ABS.
Surface treatments include electroplating, spray coating, screen printing, and pad printing. ABS, HIPS, and PC materials exhibit excellent surface‑treatment results; however, PP materials have relatively poor surface‑treatment performance and typically require pre‑treatment. Other techniques include in‑mold decoration (IMD), in‑mold labeling (IML), and, in recent years, the development of semi‑transmissive, semi‑reflective mirror‑manufacturing technologies.
Differences and Advantages of IMD and IML:
1. The substrate of IMD films is typically a PET with strong release properties, whereas IML films are usually made of PC.
2. During IMD injection molding, only the ink on the diaphragm bonds with the resin, whereas IML uses resin to coat the entire diaphragm.
3. IMD is automatically fed and positioned by the film‑feeding machine, while IML is manually hung by an operator.
1.1 Exterior Design
For plastic components, if the exterior design is flawed, the mold may be rendered unusable, so utmost care is essential. The design should ensure an aesthetically pleasing, streamlined appearance with smooth, natural transitions between curved surfaces, while also adhering to ergonomic principles. In most consumer electronics used in everyday life, the housing typically consists of an upper shell and a lower shell. In theory, the shapes of these two halves can match; however, in practice, factors such as mold‑making tolerances and injection‑molding parameters often lead to dimensional discrepancies—resulting in either “face scraping” (where the top shell is larger than the bottom) or “bottom scraping” (where the bottom shell is larger than the top). Such surface misalignments are generally considered acceptable.
Generally, the top cover, with more button openings, exhibits greater molding shrinkage; therefore, a higher shrinkage rate—typically 0.5%—is selected. In contrast, the bottom cover experiences less molding shrinkage, so a lower shrinkage rate—usually 0.4%—is chosen. Consequently, the shrinkage rate of the front cover is typically 0.1% higher than that of the bottom cover.
Related News
How can LED display panel manufacturers achieve closed-loop innovation?
Products are the foundation of an enterprise, and innovation is the soul of those products. As the LED display‑module industry continues to evolve, manufacturers are increasingly recognizing the critical importance of innovation. With numerous avenues for innovation at their disposal, how can companies build a closed-loop ecosystem that unlocks new opportunities and enables sustainable, long-term growth?
Which domestic suppliers are well-known for LED digit modules?
When choosing a digital tube kit, users naturally turn to suppliers, as this often results in significantly lower prices, helping consumers save considerably. So, which well-known digital tube kit suppliers are available in China? This is a question that frequently comes up online. To help you identify reliable manufacturers, we’ll walk you through the options below.