Apr 01,2022
Here, the editor will briefly explain the situation. The requirements of a manufacturing process do not depend solely on the materials; they also hinge on the product’s structure and the desired quality of the finished goods. While higher material costs inevitably lead to higher production expenses, this does not necessarily mean longer production times or higher labor costs—rather, it is the material cost that drives the overall expense.
Apr 01,2022
Can plastic water cups with the same cup shape but different materials use the same set of molds?
First, for plastic materials with similar material properties and the same manufacturing process, a single mold can often be shared. However, this is contingent on numerous factors—such as the product’s process requirements, production complexity, and its inherent structural characteristics. If all these conditions are met—for example, an AS blow-molding mold can also accommodate PC, and a PC mold can be used for Tritan—this does not mean that AS and Tritan can share a mold simply because AS and PC can. The manufacturing processes for AS and Tritan differ significantly, and their processing parameters vary considerably as well. Secondly, there are even more cases where sharing a mold is not feasible. Take, for instance, a simple disposable coffee cup: although both are produced using injection molds, melamine and Tritan cannot share a mold, as the two materials have entirely different production requirements—including distinct temperature settings, pressure levels, and molding cycle times. Whether it’s an injection mold or a blow‑molding mold, we fully understand buyers’ concerns, since plastic molds are relatively expensive and they seek to maximize compatibility and utilization. Therefore, when selecting materials for a plastic product, it’s essential to carefully consider which material will best suit your needs—provided that cost‑effectiveness and budgetary constraints allow for such a decision. Similarly, polypropylene (PP), due to its softer nature, is prone to shrinkage and other material‑related issues during production, so it likewise cannot share a mold with other plastics.
May 18,2026
According to the workpiece and the manufacturing process, molds can be classified as follows: ① Molds for processing metals. ② Molds for processing non-metals and for powder metallurgy, including plastic molds (such as two‑color molds, compression molding molds, and extrusion molding molds), rubber molds, and powder metallurgy molds. Based on their structural characteristics, molds can further be divided into flat blanking dies and three‑dimensional cavity molds. Molds are typically produced in single pieces or small batches.
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How to Design an Blister Molding Mold
Blow-molding molds are something we often see and use, yet many people assume their design is straightforward. But do you really know how to design a blow-molding mold? Let’s examine the key considerations during the design process. ### 1. Mold Opening Direction and Parting Line At the outset of designing any blow-molded product, it’s essential to determine the mold opening direction and parting line. This ensures minimal reliance on core‑pulling mechanisms and eliminates visible parting lines that could affect the product’s appearance. ### 2. Draft Angle 1. An appropriate draft angle helps prevent surface defects such as stringing or fuzziness. For smooth surfaces, the draft angle should be ≥0.5°; for textured (sanded) surfaces, it should exceed 1°; and for rough-textured surfaces, it should be greater than 1.5°. 2. Proper draft angles also help avoid top‑surface damage, including whitening, deformation, or cracking at the product’s apex. 3. When designing deep‑cavity products, the outer surface draft angle should ideally be steeper than the inner surface draft angle. This prevents core misalignment during molding, ensures uniform wall thickness, and maintains material strength at the product’s opening. ### 3. Wall Thickness 1. Different plastics have specific recommended wall‑thickness ranges, typically between 0.5 mm and 4 mm. If wall thickness exceeds 4 mm, cooling times become excessively long and shrinkage issues may arise; in such cases, consider revising the product’s geometry. 2. Uneven wall thickness can lead to surface shrinkage. 3. Irregular wall thickness may cause porosity and weld lines. ### 4. Reinforcing Ribs 1. Appropriately applied reinforcing ribs enhance product rigidity and reduce deformation. 2. The rib thickness must not exceed 0.5–0.7 times the product’s wall thickness; otherwise, surface shrinkage may occur. 3. The single‑side slope of reinforcing ribs should be greater than 1.5° to prevent top‑surface damage. Blow-molding molds are something we often see and use, yet many people assume their design is straightforward. But do you really know how to design a blow-molding mold? Let’s examine the key considerations during the design process. ### 1. Mold Opening Direction and Parting Line At the outset of designing any blow-molded product, it’s essential to determine the mold opening direction and parting line. This ensures minimal reliance on core‑pulling mechanisms and eliminates visible parting lines that could affect the product’s appearance. ### 2. Draft Angle 1. An appropriate draft angle helps prevent surface defects such as stringing or fuzziness. For smooth surfaces, the draft angle should be ≥0.5°; for textured (sanded) surfaces, it should exceed 1°; and for rough-textured surfaces, it should be greater than 1.5°. 2. Proper draft angles also help avoid top‑surface damage, including whitening, deformation, or cracking at the product’s apex. 3. When designing deep‑cavity products, the outer surface draft angle should ideally be steeper than the inner surface draft angle. This prevents core misalignment during molding, ensures uniform wall thickness, and maintains material strength at the product’s opening. ### 3. Wall Thickness 1. Different plastics have specific recommended wall‑thickness ranges, typically between 0.5 mm and 4 mm. If wall thickness exceeds 4 mm, cooling times become excessively long and shrinkage issues may arise; in such cases, consider revising the product’s geometry. 2. Uneven wall thickness can lead to surface shrinkage. 3. Irregular wall thickness may cause porosity and weld lines. ### 4. Reinforcing Ribs 1. Appropriately applied reinforcing ribs enhance product rigidity and reduce deformation. 2. The rib thickness must not exceed 0.5–0.7 times the product’s wall thickness; otherwise, surface shrinkage may occur. 3. The single‑side slope of reinforcing ribs should be greater than 1.5° to prevent top‑surface damage.
How to Properly Maintain Rubber Molds
Every object has a finite lifespan, and to extend its service life, we must understand the proper maintenance procedures. Below are the correct methods for maintaining rubber molds. First, the wear curve of regularly maintained molds exists for every mold. Mold maintenance focuses on addressing abnormal wear that occurs during operation, and the number of stamping cycles completed during this period is easy to track. Once the predetermined cycle count is reached, a maintenance plan can be implemented, making it straightforward to identify maintenance tasks and manage maintenance timing. Second, enhanced maintenance aims to prolong mold life, ensure consistent quality, and simplify upkeep by refining specific mold components through targeted improvements. Third, routine maintenance involves standard cleaning and inspection of rubber molds, as well as lubrication with oil or similar substances. This work typically ensures the mold remains in good working condition, enabling early detection of any abnormalities. Fourth, when rubber molds experience malfunctions during processing—resulting in issues such as excessive burrs, incorrect dimensions, surface defects, or even burnt mold parts—they can no longer function safely. Such abnormalities necessitate immediate repair and maintenance, which is referred to as “accident‑related maintenance.” This type of maintenance is usually performed when the mold is nearing its operational limits; if the cost of maintaining the mold becomes prohibitive, its useful life may be short. Because such repairs often occur unexpectedly, it is essential to have contingency plans in place, including scheduled shutdowns and emergency response procedures.
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