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Transfer Molding Method

The transfer molding method can be thought of as a slightly improved version of the compression molding method. It is basically close to the principle of manual injection. It is a production method used with a combination of compression molding and injection molding. The presses used in transfer molding are the same as those used in compression molding. In transfer molding, the material is placed in a transfer chamber in the mold instead of being placed directly into the mold chamber. The material in the transfer chamber is forced into a flow to fill the mold chambers, passing through the runners where the material advances, by the compression of a pusher on the mold top plate, and the vulcanization process is initiated as in compression molding.

Some advantages and disadvantages of production by transfer molding can be listed as follows:
• Thanks to the transfer of the material to the chambers through the runners in the mold, more than one chamber can be filled with material from a single chamber.
• Compared to compression molding, since there will not be a separate material placement in each mold chamber, it can be more advantageous in terms of cycle times in parts with high production numbers.
• It is preferred as a more suitable method than compression molding in the production of parts for which precision is required, since material feeding will be done more.
• The areas that cannot be filled and reached with manual feeding in compression molding can be fed more easily with transfer molding.
• According to the weight and geometry of the part in compression molding, the pre-forming work done before production is less in transfer molding. Labor losses are less with the transfer chamber and the weight adjustment in the ratio of the total number of cells.
• The transfer molding method, which will be printed on another material in the form of coating in a silicone material mold, is suitable for this type of production with the principle of semi-injection.
• Mold costs are between compression and injection molds. Transfer molds can be used in presses where compression molds are used.
• Transfer burrs from vulcanized silicone remain in the transfer chamber after the cycle in the process. This situation increases material wastage. The post-cycle transfer chamber needs to be cleaned in preparation for the next print, resulting in increased cycle times.
• Burr formations occur on the part in compression molding. However, if the process conditions, mold and material are balanced, less burr formation can be achieved compared to compression molding. This indirectly affects the time spent on secondary cleaning operations.
• Silicone formulations with high material hardness and high viscosity are not suitable for use in transfer molds in terms of manufacturability. Problems may arise at the point of flow of the material into the mold chambers.

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