Do not consider the draft
Drafting is one of the more practical considerations when designing injection Pet Bottle Preform molded . Essentially, incorporating a draft into a part design means that you are tapering or otherwise making the part easier to release or remove from the mold. Parts that are difficult to remove from the mold are more susceptible to damage and increase cycle time, offsetting some of the benefits of injection molding.
Wall thickness not correctly planned
The material in the injection molding is a plastic that has been heated to a liquid state. As the wall thickness varies, the liquid will cool back to the solid at different speeds - if the difference in thickness is sufficiently sudden, it will result in inaccurate part production because the still molten material flows from the thicker wall area to the already cooled thinner Wall. This also causes dents and warps. If you can't design a wall of uniform thickness, be sure to gradually change the thickness throughout the part.
Do not consider all types of molds
Injection molds are usually made of tool steel or other strong metals that are manufactured for durability. A high-quality mold can produce millions of parts with almost no degradation in quality. However, if you want to make it in smaller quantities—either prototypes or tests, or simply because you don't expect millions of demands—you might consider prototype molds. Prototype molds typically use lower grade metals and are manually introduced. This is why prototype molds have lower upfront costs, allowing you to make smaller quantities.
Total cost not considered
However, it is always important not to be fooled by the low upfront costs of any aspect of the project. Total cost is the most important consideration – whether it's the life of the tool, the material you choose, or the supplier and distributor you work with. This is not always the case, but low upfront costs hide more expensive problems. Be sure to look at your product in the long run.
Improper material selection
The versatility of injection molding means you can use a very wide range of plastic materials. Use this opportunity to research and choose the materials that are right for you. Consider the needs and environment of your role. Strength, flexibility, temperature range and transparency are several common requirements that affect plastic selection, manufacturing processes and even the parts themselves. Making correct, sensible choices can improve lead time, part quality, and cost efficiency. If you need help with plastics, you can choose Jilian Molding, a well-experienced pet preform manufacturers that can solve all your problems.