Cooling Jackets for Extrusion and Injection Molding

Product Specifications

Technical details and manufacturing context for Cooling Jackets

Definition

Cooling jackets are essential components of barrel assemblies in extrusion and injection molding machinery. They form an annular space around specific barrel zones where temperature-sensitive materials are processed. By circulating water, oil, or other heat transfer fluids through this jacket, they actively remove excess heat generated by mechanical shear and friction during plasticization, preventing material degradation and maintaining precise thermal profiles critical for product quality. Constructed from carbon steel or stainless steel (304/316), these jackets are designed to match the barrel's outer diameter, with inner diameters ranging from 100 to 500 mm, lengths from 200 to 2000 mm, and wall thicknesses from 5 to 20 mm. They operate at pressures of 1.0 to 1.6 MPa and temperatures from -20°C to 200°C, with flow rates of 10 to 100 L/min. Connection sizes range from DN15 to DN100 (ISO 7005), and surface roughness can be specified from 0.8 to 3.2 μm Ra (ISO 4287), with lower values for food or pharmaceutical applications. Weights vary from 10 to 150 kg depending on size and material. These parameters are reference ranges; actual values must be confirmed with the manufacturer for specific models. Cooling jackets are selected based on barrel dimensions, cooling demand, and process requirements. They interface with the barrel via bolted flanges or clamps, and with the cooling system via inlet and outlet ports. Verification questions include checking material grade, pressure rating, and dimensional fit. Maintenance signals include leaks, reduced cooling efficiency, or corrosion. Failure boundaries include exceeding pressure or temperature limits, which can cause seal degradation or structural damage.

Working Principle

Heat from the barrel wall is conducted to the inner surface of the cooling jacket. A coolant (typically water) is pumped through the jacket's internal channels, absorbing this heat via forced convection. The heated coolant then exits to an external heat exchanger, dissipates the heat, and is recirculated. This creates a closed-loop system for precise, active temperature reduction in designated barrel zones.

Common Materials

Carbon Steel, Stainless Steel (304/316)

Technical Parameters

Parameter	Typical range	Notes & selection driver
Inner Diameter	100–500 mm	Matches barrel outer diameter
Length	200–2000 mm	Customizable per barrel section
Wall Thickness	5–20 mm	Affects heat transfer and strength
Operating Pressure	1.0–1.6 MPa	Below 1.0 MPa insufficient cooling flow
Operating Temperature	-20–200 °C	Above 200°C may degrade seals
Flow Rate	10–100 L/min	Depends on cooling demand
Material	304/316L	316L for corrosive mediaASTM A240
Surface Roughness	0.8–3.2 μm Ra	Lower for food/pharmaISO 4287
Connection Size	DN15–DN100	Inlet/outlet portsISO 7005
Weight	10–150 kg	Depends on size and material

Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.

Components / BOM

Jacket Body/Casing Part
Forms the primary structure enclosing the barrel and contains the coolant channels.

Material: Carbon Steel or Stainless Steel
Coolant Inlet/Outlet Ports Part
Threaded connections for attaching hoses to supply and return coolant from the circulation system.

Material: Steel (often welded or threaded fittings)
Internal Baffles/Channels Part
Direct the flow of coolant in a specific path (e.g., spiral) within the jacket to maximize heat transfer efficiency and prevent dead zones.

Material: Steel (integral to casing)
Sealing Gaskets/O-Rings Part
Create a pressure-tight seal between the jacket and the barrel or between split jacket halves to prevent coolant leaks.

Material: Silicone, Viton, EPDM, or other temperature-resistant elastomers

Applied To / Applications

This component is essential for the following industrial systems and equipment:

Barrel Assembly

View system integration details

Manufacturers of Cooling Jackets

Manufacturer profiles associated with Cooling Jackets.

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Frequently Asked Questions

What materials are cooling jackets available in?

According to the directory, cooling jackets are available in carbon steel and stainless steel (304/316). For corrosive media, 316L may be specified, but confirm with the manufacturer.

What is the operating pressure range?

The reference range is 1.0 to 1.6 MPa. Below 1.0 MPa, cooling flow may be insufficient. Always verify the actual rating for your specific model.

How do I select the right cooling jacket size?

Key parameters include inner diameter (matching barrel outer diameter, 100-500 mm), length (200-2000 mm), and wall thickness (5-20 mm). These must be confirmed with the manufacturer based on your barrel section.

What maintenance is required?

Monitor for leaks, reduced cooling efficiency, or corrosion. Ensure operating pressure and temperature stay within limits (-20°C to 200°C) to prevent seal degradation.

Data Basis

Editorial classification, named public sources where available, and source-reviewed manufacturer records.

Preliminary Technical Classification

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pressure:	Up to 10 bar (150 psi) standard, higher available with reinforced designs
flow rate:	5-100 L/min per jacket section, adjustable via port sizing
temperature:	-40°C to 200°C (typical), depending on seal and material selection
slurry concentration:	Up to 40% solids by weight with proper port design and erosion-resistant materials

Cooling Jackets

Product Specifications

Applied To / Applications

Industrial Ecosystem & Supply Chain Structure

Application Fit & Sizing Matrix

Reliability & Engineering Risk Analysis

Compliance & Manufacturing Standards