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them from the mold cavity. Ejector plate is to push a molded part off a core or out of a cavity mold. It is attached to a core and moves linearly along leaders.
3.5 Coding of standard structural units
After specifying structural unit dimensions, this investigation
introduces a coding system to assist in managing these components and units.
3.5.1 Structural unit codes
This study uses three digits to code all of the structural units
(Fig. 6a). The first digit is the main function code, which represents product geometry and dimensions, and symbolizes standardized structural units. The second digit is the sub-function code, which represents materials, and is widely used in bills of materials (BOM) for structural units. The third digit represents the characteristics of each structural unit, and includes the codes for products families and dimensions.
3.5.2 Product identification complex code
This code is designed for rapidly searching structural units which are mutually exchangeable during product development. This code integrates all structural units correlated with the manufacture of a specific container, and also reveals information on mold geometry and dimensions, and product characteristics, as shown in Fig. 6b.
4. Procedure for developing container products
Based on the above-mentioned modular design approach, a standard operation procedure for designing beveragecontainer injection molds can be generated. Thus, merely following the procedure can easily design molds for new products and identify interchangeable structural units which
can help effectively manage and maintain products and molds. Figure 7 shows the standard operation procedure for designing beverage-container injection molds. The procedure comprises nine steps and is illustrated as follows.
Step 1. Confirmation of product specifications: In order to exactly describe the geometry, dimensional accuracy, and quality characteristics of products, this step defines the product with its geometrical characteristics, such as width, height, projection area, and weight.
Step 2. Manufacturing facility analysis: Based on the information from Step 1, the most suitable injection molding machine is determined by checking specifications such as clamping force, shot volume, range of mold thickness, and daylight.
Step 3. Modular design of injection molds: Through the pision of mold function into several functional modules, the injection mold of a specific container can be rapidly and easily developed by module stacking. Modules to be designed include male mold module, female mold module, hot-runner
module, and others.
Step 4. Product and unit coding: Each structural unit is assigned a component code, which is then integrated with the product characteristics to yield a product complex identification code. Consequently, mutually exchangeable units are available in the product development stage. Furthermore, the code system simplifies mold maintenance and product management.
Step 5. List of modular objects: According to the structural specifications from Step 3, all components of an injection mold are listed in BOM. For instance, the BOM of a cup-shaped injection mold as an example is illustrated in Fig. 8. This step facilitates ease of handling during the subsequent quotation and production scheduling process.
Step 6. Component drawing: Since dimensions of structural units are for semi-products, the BOM information listed in Step 5 simply is the initial
stage of mold design. Thereby, all structural units of an injection mold designed for customer requirement and specification have to be drawn
in the format of engineering drawing for engineering purposes.
Step 7. Structural unit manufacturing: Following the information of BOM and component drawing generated in Steps 5 and 6, respectively, this step
enables the factory floor to further manufacture the injection mold.
Step 8. Mold assembly and inspection: This step inspects each unit manufactured in Step 7 to assure mold quality. Based on the assembly drawing of a mold, the location of related modules and structural units