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| anitahenley4 | 04 Apr 2023 - 19:01:03  |
| 37 Posts |
Gates Gates are the openings at the end of the runners that direct the flow of molten plastic into the mold cavity. Gates vary in size and shape depending on the part design and resin material. Design engineers must take into account a number of factors to determine gate types and locations to achieve optimum flow, fill pressure, cooling time, and dimensions/tolerance. It is important to locate gates where they won’t impact part performance or appearance (flow marks, shrinkage, warping). Draft One aspect of mold design that cannot be overlooked is the easy removal of the final product from the mold, with no damage to the surface of the part. This is accomplished by applying a draft angle, or taper, to the walls of the mold. The amount or degree of draft angle depends on several factors, including design of the part, material, depth of the mold cavity, surface finish, texture, and amount of shrinkage. Typically an angle of only a few degrees is applied to the side walls of the mold and creates enough space that the part can be easily removed when the mold is opened. Generally, the deeper the cavity, the more draft is required. Draft angles typically vary from about 1 to 5 degrees. Finish and texture Mold cooling and part cooling are critical for determining surface finish. For example, a smooth surface finish on a 50-percent glass-filled resin depends on proper temperature control. The surface must be resin-rich with the fiber glass slightly deeper in the part, which requires a hotter mold—this also means it takes about ten percent longer to cool. Molds can also be designed to apply a texture or pattern to the mold surface—this can actually eliminate assembly steps by creating the company logo in the plastic, for example. Texture can also provide better product function, such as enhanced grip or reduced wear from friction. Types of textures include matte, gloss, graphics, grains, logos, and geometric patterns. Depending on the type, depth, and location of texture, draft may need to be adjusted to facilitate part ejection, which is determined during the mold design process. |
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| Annette78 | 04 Apr 2023 - 19:01:46 |
| 6 Posts |
TDL Mold (Hong Kong) Ltd. has over 30 years of experience in precision plastic mold manufacture and check out how to do Mold Design maintenance services. TDL provides a complete range of plastic injection molding services to its diverse clientele, including designers, OEM manufacturers, electronics manufacturers and distributors. |
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