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What is the structure of a plastic mold?
Release Date:
2022-04-06 17:48
Source:
Plastic mold The structure primarily comprises a variable‑cavity female die consisting of a female die base plate, a female die assembly, and a female die assembly clamping plate, as well as a variable‑core male die composed of a male die base plate, a male die assembly, a male die assembly clamping plate, a cavity‑cutting assembly, and a side‑cutting assembly plate.
In order to improve Plastic mold To achieve desirable performance, various auxiliary materials—such as fillers, plasticizers, lubricants, stabilizers, and colorants—must be added to the polymer, enabling it to become a high‑performance plastic.
1. Synthetic resins are a crucial component of plastics, typically accounting for 40% to 100% of the material. Due to their high content and the fact that resin properties often determine the overall performance of the plastic, resins are frequently used as a synonym for plastics. For example, PVC resin is often confused with PVC plastic, and phenolic resin with phenolic plastic. In reality, resin and plastic are distinct concepts: resin is a raw polymer used not only in plastic production but also as a precursor for coatings, adhesives, and synthetic fibers. With the exception of a few plastics that consist entirely of resin, most plastics, in addition to resin as the primary constituent, require the incorporation of other additives.
2. Packaging
Fillers, also known as reinforcing agents, can enhance the strength and heat resistance of plastic molds while reducing costs. For example, adding wood flour to phenolic resin can significantly cut production expenses, making phenolic plastics one of the more affordable types of plastic, while also markedly improving their mechanical strength. Fillers are classified into organic and inorganic types: the former includes wood flour, shredded cloth, paper, and various textile fibers, whereas the latter comprises glass fiber, diatomaceous earth, asbestos, and carbon black.
3. Plasticizer
Plasticizers can enhance the plasticity and flexibility of plastic molds, reduce brittleness, and make plastics easier to process and mold. Plasticizers are typically high-boiling organic compounds that are miscible with resins; they are non-toxic, odorless, and stable under light and heat. Phthalates are among the most commonly used types. For example, when producing PVC plastics, adding more plasticizer yields a softer PVC material. Conversely, if no plasticizer is added or only a small amount is used (at a dosage…
4. Stabilizer
To prevent synthetic resins from being degraded by light and heat during processing and use, thereby extending their service life, Plastic mold Stabilizers should be added to the formulation. Commonly used ones include stearates and epoxy resins.
5. Colorant
Colorants can impart a wide range of vibrant and attractive hues to plastic molds. Organic dyes and inorganic pigments are commonly used as colorants.
6. Lubricant
The function of a lubricant is to prevent Plastic mold During molding, it adheres to the metal mold while ensuring a smooth, aesthetically pleasing plastic surface. Common lubricants include stearic acid and its calcium and magnesium salts. In addition to these additives, flame retardants, foaming agents, antistatic agents, and others can also be incorporated into plastics.
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