For resins that are compatible, compression molding eliminates molded stresses, produces less wasted material, improves molding cycle speed and significantly reduces tonnage requirements. Modor design engineers can help you decide if compression molding is right for you.
Both compression and injection molding come with pros and cons. But how do you know which manufacturing process better suits your food and beverage closure design? There are many factors from the size of the cap to your desired lead time that can make or break your decision.
Compression molding is more limited when needing complex geometrics and larger diameter closures that are greater than 48mm. On your next closure project, work with Silgan Closures.
While depression molding is an easy and low-cost method of producing products at high volume, it has limitations when it comes to complex geometric designs. Is injection molding better for your needs? There are a few things to consider. Injection molding is ideal for more complex parts and components.
While the plastic polymer used in compression molding is generally heated before it’s inserted into the mold, the mold is also heated to encourage expansion. The combination of both pressure and heat makes compression molding a highly effective molding process in the manufacturing industry.
If the plastic polymer is heated too much, on the other hand, it may create an excessive amount of pressure while requiring a longer cooling time. There are also different heating methods available for compression molding, which can affect the performance of this molding process.
With that said, they aren’t necessarily the same.
3. For producing those large or complex plastic article, in order to prevent starved feeding or uneven density, the plastic material should be placed appropriately in mold cavity to fill all mold areas, which is based on the prediction of flow direction.
Advanced composite thermoplastics can also be compression molded with unidirectional tapes, woven fabrics, randomly orientated fiber mat or chopped strand.
Compression molding is often the more economical manufacturing process when working with low volume thermoset resins. The compression molding process provides additional geometry flexibility over standard injection molding and is typically used to produce large, fairly complex parts that are unsuitable for injection molding presses.
Compression molding is only compatible with a select number of thermoset resins. For resins that are compatible, compression molding eliminates molded stresses, produces less wasted material, improves molding cycle speed and significantly reduces tonnage requirements. Modor design engineers can help you decide if compression molding is right for you.
Since there is no gate present, as there is with injection molding, gate vestige is avoided and visual appearance is better . Compression also offers the ability to be more efficient with color changeovers. Compression molding is more limited when needing complex geometrics and larger diameter closures that are greater than 48mm.
Injection molding is usually the method of choice for a lower volume run because of its easy line changes and multiple material choices. If you’re looking to run a higher volume, you may want to consider compression molding. This process extrudes plastic material that is melted, cut, and inserted into a cavity.
Plastics are used to make everything from children’s toys to critical medical components. However, the process by which these products are made is determined by your industry’s specifications. There are several plastic molding options available for this very reason, each capable of adhering to specific requirements.
The process of compression molding begins with placing hot plastic inside a heated mold and compressing the plastic into the desired shape. Once the part has been cooled, it is removed from the mold and cured to ensure that the part maintains its structural integrity.
The injection molding process is the most utilized manufacturing process for the fabrication of plastic parts. Melted plastic is injected into a mold, where it gradually takes shape. Once injected, the plastic begins filling the cavities outfitted on the mold and is left to cool and harden.
The process for compression molding is slightly different. This method uses compression and heat to produce plastic parts and components. Instead of liquid plastic, thermosetting resins are poured into a heated mold cavity . The resin will be forced down into the cavity until filling the mold completely.
The injection method makes it easier to change sizes and is more efficient due to the ability to independently control the inner cavity.
Injection molding is a process in which heated liquid material is “injected” into a mold. Once the material cools and hardens, it forms the shape of the mold. Nova injects melted plastic into molds to create auto parts or a single component of a larger part.
It is also highly versatile for producing most any part you need. There are around 20,000 plastic components that can be used for injection molding, making it suitable for a wide variety of auto parts or other plastic products, as well as products for different industries.
Gate feature – Injection molds use something called a “gate” through which the heated material is injected into the cavity (mold).
With pressure kept steady until the material has taken the shape of the mold. Compression molding is a good method for basic plastic products that demand high-volume output.
Speed – Mass production becomes easier and faster as injection molding can be done completely through mechanical means. During the molding, machines take over with no need to slow down or stop for adjustments in the assembly process.