Commonly Used Resins

,

Commonly used resins for injection and blow molding in daily use plastic wares：

daily use resin types

1. Polypropylene (PP)

  • Characteristics: Lightweight, chemical-resistant, high tensile strength, and flexible.
  • Applications: Containers, kitchenware, toys, and automotive parts.
  • Technical Difficulties: High shrinkage rate can lead to warping.
  • Mold Requirements: Precise temperature control and high tolerance to manage shrinkage and ensure dimensional accuracy.

2. Polyethylene (PE)

  • a. High-Density Polyethylene (HDPE)
  • Characteristics: Strong, impact-resistant, and moisture-resistant.
  • Applications: Bottles, milk jugs, detergent containers, and piping.
  • Technical Difficulties: Can experience warping and requires careful cooling.
  • Mold Requirements: Consistent cooling systems and robust mold design to handle high pressure.
  • b. Low-Density Polyethylene (LDPE)
  • Characteristics: Flexible, translucent, and chemical-resistant.
  • Applications: Shopping bags, squeeze bottles, and food wraps.
  • Technical Difficulties: Prone to deformation under stress.
  • Mold Requirements: Molds should facilitate uniform cooling and support flexible part ejection.

3. Acrylonitrile Butadiene Styrene (ABS)

  • Characteristics: Strong, rigid, heat-resistant, and good dimensional stability.
  • Applications: Electronic housings, toys (e.g., LEGO), and automotive components.
  • Technical Difficulties: Issues with sink marks and voids.
  • Mold Requirements: Ensure even pressure distribution and optimal cooling to prevent defects.

4. Polyvinyl Chloride (PVC)

  • Characteristics: High chemical resistance, rigidity or flexibility (depending on formulation), and durability.
  • Applications: Pipes, bottles, and medical devices.
  • Technical Difficulties: Releases corrosive gases when heated.
  • Mold Requirements: Corrosion-resistant materials and adequate ventilation systems to handle gases.

5. Polystyrene (PS)

  • a. General Purpose Polystyrene (GPPS)
  • Characteristics: Clear, rigid, and brittle.
  • Applications: Disposable cutlery, food containers, and packaging materials.
  • Technical Difficulties: Prone to cracking and brittleness.
  • Mold Requirements: Facilitate easy ejection and smooth surfaces to prevent cracking.
  • b. High Impact Polystyrene (HIPS)
  • Characteristics: Impact-resistant, opaque, and slightly flexible.
  • Applications: Refrigerator liners, toys, and display panels.
  • Technical Difficulties: Can warp if not cooled properly.
  • Mold Requirements: Uniform cooling and robust mold design to handle impact resistance.

6. Polyethylene Terephthalate (PET)

  • Characteristics: Strong, lightweight, and transparent.
  • Applications: Beverage bottles, food jars, and containers.
  • Technical Difficulties: Issues with crystallization and moisture sensitivity.
  • Mold Requirements: Precise temperature control and drying systems to manage crystallization and moisture.

Injection and blow molding with different resins involves specific challenges and mold requirements. PP and HDPE require managing shrinkage and cooling. LDPE demands flexible ejection systems. ABS and HIPS need molds that handle pressure and impact resistance. GPPS requires smooth surfaces for easy ejection, while PET demands strict temperature control to prevent crystallization and moisture issues. Understanding these nuances ensures efficient production of high-quality daily use plastic wares.

VolksMolds is a leading plastic injection mold manufacturer known for its expertise, experience, and proven history. Moreover, the company excels in producing high-precision molds for various sectors, including packaging, store displays, and homewares. With a commitment to quality and innovation, VolksMolds consistently delivers reliable and efficient molds, thereby earning a strong reputation in the global market.

click to try our free part costing tool