 Molding Methods Simple Drawings
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| In order to let our website visits can understand easily what are the molding of compression, trasfer and |
| injection, how there are work? We show simple drawings of these main molding methods as below: |
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| Compression molding of rubber |
Transfer molding is used for |
Used for both rubber and plastic |
| parts utilizes relatively molds. |
high volume production of |
components, injection molding is |
| The use of accurately weighed |
close tolerance rubber parts. |
ideal for very long production |
| preforms keeps material costs |
Material costs are higher, but |
runs where the parts must have |
| to a minimum. |
“trimless” molding reduces |
excellent dimensional integrity. |
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finishing costs. |
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| What's compression molding? |
| Compression Molding is the original production method for molded rubber.It |
| is ideal for low to medium volumes and a useful molding process for forming |
| bulky parts, gaskets, seals and O-rings. It is a widely used, efficient,econom |
| -ical production method for many products particularly low production volu |
| -mes of medium to large parts, materials with a high cost and applications |
| that demand extreme hardness. The process involves compressing preform |
| -ed rubber in a mold with a press. During the compression process, rubber is |
| forced into the mold cavity to form the final product. |
| Rubber Compression Molding offers advantages over other methods by |
| providing: |
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Tooling savings |
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Short setup time (saves on short production runs) |
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The capacity to process stiff, high durometer materials |
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Least amount of waste |
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| What's rubber transfer molding? |
| Rubber Transfer Molding combines the advantages of injection molding with |
| the ease of compression molding. Rubber transfer molding is the ideal |
| process for forming parts that require: |
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Exact positioning |
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Bonding rubber to fragile metal parts - such as wire |
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Mold designs that contain multiple cavities and can trap air |
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Intricate parts with lower volume requirements |
| The process of transfer molding involves pushing unvulcanized rubber top |
| through sprues into a heated mold. The rubber is placed in a chamber at the |
| of the mold then placed in a press. During the transfer process, rubber is |
| forced through the mold to prevent trapped air while forming the final |
| product. |
| Transfer molding offers several advantages over other methods by |
| providing: |
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Shorter production cycles |
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Maintains closer dimensional tolerances than compression molding |
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Provides uniformity |
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Fast mould setup |
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| What's rubber injection molding? |
| Rubber Injection Molding is an ideal process for forming high volume production, large |
| quantities of small to medium size parts, complex inserts, close dimensional tolerances, |
| insert molding and components that require uniformity. Rubber injection molding is |
| particularly suited for products similar to the grommets shown above. |
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| The process of rapidly forcing an exact amount of rubber from a tube/cylinder into a |
| closed, heated mold. This process provides economical advantages including: |
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Short molding cycle |
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Lower unit cost
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High dimensional tolerances |
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Absence of flash |
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Little scrap/waste |
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