INDUSTRY COMPONENT

Shot Sleeve

A cylindrical component in injection molding machines that transfers molten plastic from the hopper to the injection unit.

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Component Specifications

Definition
The shot sleeve is a critical component in plastic injection molding systems, serving as the conduit through which molten plastic material is transferred from the hopper to the injection unit. It is typically a cylindrical tube made from high-grade steel, designed to withstand high temperatures and pressures while maintaining precise dimensional stability. The shot sleeve ensures consistent material flow and prevents contamination during the injection process.
Working Principle
The shot sleeve operates by receiving molten plastic from the hopper and guiding it through the injection system. As the injection screw rotates and moves forward, it pushes the molten material through the shot sleeve into the mold cavity. The sleeve's smooth interior surface minimizes friction and ensures uniform flow, while its thermal properties help maintain the material at optimal processing temperature.
Materials
Typically made from high-grade tool steel (such as H13 or P20), often hardened and chrome-plated for wear resistance and corrosion protection. Some applications use bimetallic linings for enhanced durability.
Technical Parameters
  • Length 500-2000 mm
  • Diameter 40-120 mm
  • Wall Thickness 10-30 mm
  • Pressure Rating 150-250 MPa
  • Surface Hardness 45-55 HRC
  • Operating Temperature 200-350°C
Standards
ISO 294, DIN 16742

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Shot Sleeve.

shot sleeve injection molding plastic injection molding component material transfer injection system manufacturing equipment Shot Sleeve in Rubber and Plastic Product Manufacturing

Parent Products

This component is used in the following industrial products

Injection System

Component responsible for injecting molten metal into the die cavity under high pressure

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Engineering Analysis

Risks & Mitigation
  • Material degradation due to overheating
  • Wear and scoring from abrasive materials
  • Corrosion from certain plastic additives
  • Thermal stress cracking
FMEA Triads
Trigger: Inadequate temperature control
Failure: Material sticking or degradation
Mitigation: Implement precise temperature monitoring and control systems
Trigger: Abrasive plastic compounds
Failure: Premature wear and scoring
Mitigation: Use hardened or coated sleeves and implement regular inspection schedules
Trigger: Improper alignment
Failure: Uneven material flow and pressure variations
Mitigation: Ensure proper installation and periodic alignment checks

Industrial Ecosystem

Compatible With

Interchangeable Parts

Compliance & Inspection

Tolerance
±0.05 mm diameter, ±0.1 mm straightness
Test Method
Dimensional inspection with micrometers, surface roughness testing, pressure testing at 1.5x operating pressure

Procurement Evaluation Criteria

Not customer reviews or live demand data. These dimensions support RFQ preparation and supplier evaluation.

Technical documentation
4/5
Manufacturing capability
4/5
Inspection readiness
5/5
Supplier transparency
3/5

These scores are example evaluation dimensions, not real customer ratings, country-specific buyer feedback, or live inquiry activity.

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Frequently Asked Questions

What is the primary function of a shot sleeve?

The shot sleeve transfers molten plastic from the hopper to the injection unit while maintaining material temperature and ensuring consistent flow into the mold cavity.

How often should shot sleeves be inspected?

Shot sleeves should be inspected every 6-12 months for wear, scoring, or corrosion, with more frequent checks in high-volume production environments.

Can shot sleeves be repaired if damaged?

Minor surface damage can often be polished out, but significant wear or scoring typically requires replacement to maintain injection quality.

Can I contact factories directly?

Yes, each factory profile provides direct contact information.

Data Basis

CNFX manufacturer profiles, technical classification, publicly available product information, and ongoing plausibility checks.

Preliminary Technical Classification
This page supports structured research, RFQ preparation, and supplier evaluation. It does not replace buyer-led supplier qualification, standards review, or technical approval.

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