Orifice Array for Extrusion Die Plates

Product Specifications

Technical details and manufacturing context for Orifice Array

Definition

The orifice array is a critical component of a polymer extrusion die plate, consisting of multiple precisely machined openings arranged in a specific pattern. This array directly determines the flow distribution, shape, and dimensions of the extruded polymer product by controlling how molten polymer exits the die. The design of the orifice array affects product uniformity, surface finish, and production efficiency in plastic extrusion processes. In the rubber and plastic product manufacturing industry, this component is essential for achieving consistent cross-sectional profiles in extruded sheets, films, or profiles. The array is typically fabricated from tool steel, stainless steel, or hardened alloy steel, with material grade H13 (per ASTM A681) commonly specified for high wear resistance. Key parameters include the number of orifices (typically 100–500), orifice diameter (0.5–5.0 mm), orifice pitch (1.0–10.0 mm), and plate thickness (10–50 mm). These parameters influence flow distribution, pressure drop, and melt distribution. The operating temperature range is 200–400 °C, and the operating pressure range is 10–50 MPa. Surface roughness is typically Ra 0.4–0.8 µm (per ISO 4287), and hardness is 48–52 HRC (per ASTM E18). The weight of the plate ranges from 5–20 kg depending on size and thickness. Flow uniformity is critical, with a tolerance of ±5%. When selecting an orifice array, engineers must verify that the specific configuration meets the required flow characteristics for the intended polymer and extrusion process. It is essential to confirm model-specific values and standards with the legal manufacturer or supplier, as the listed ranges are reference values and may vary for a particular application.

Working Principle

Molten polymer flows through the die plate and is forced through the orifice array openings. The size, shape, spacing, and arrangement of these openings control the flow rate, distribution, and final cross-sectional profile of the extruded material. Pressure differentials across the array ensure uniform flow distribution to produce consistent product dimensions. The orifice diameter and pitch determine the resistance to flow, affecting pressure drop and flow rate. The plate thickness provides structural strength and defines the flow channel length. The array's design must balance flow uniformity with mechanical integrity under operating temperatures and pressures. Proper maintenance involves monitoring for wear or blockage, which can affect product quality.

Common Materials

Tool steel, Stainless steel, Hardened alloy steel

Technical Parameters

Parameter	Typical range	Notes & selection driver
Number of Orifices	100–500 pcs	Determines flow distribution uniformity
Orifice Diameter	0.5–5.0 mm	Affects pressure drop and flow rate
Orifice Pitch	1.0–10.0 mm	Influences melt distribution
Plate Thickness	10–50 mm	Affects structural strength and flow channel length
Flow Uniformity	±5 %	Critical for product consistency
Operating Temperature	200–400 °C	Must withstand polymer melt temperature
Operating Pressure	10–50 MPa	Exceeding may cause deformation
Material Grade	H13	Hot-work tool steel for high wear resistanceASTM A681
Surface Roughness	Ra 0.4–0.8 µm	Smooth finish reduces melt adhesionISO 4287
Hardness	48–52 HRC	Ensures durability and wear resistanceASTM E18
Weight	5–20 kg	Depends on plate size and thickness

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

Orifice Opening Part
Individual flow channel for polymer extrusion

Material: Hardened steel
Land Area Part
Surface surrounding each orifice that controls flow characteristics

Material: Tool steel
Die Plate
The plate the orifices are machined into; its thickness sets the land length.

Applied To / Applications

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

Bearing Pad/Orifice Plate

View system integration details

Manufacturers of Orifice Array

Manufacturer profiles associated with Orifice Array.

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Frequently Asked Questions

What is the primary function of an orifice array in extrusion?

The orifice array controls the flow distribution of molten polymer as it exits the die plate, determining the shape, dimensions, and uniformity of the extruded product.

What materials are commonly used for orifice arrays?

Common materials include tool steel, stainless steel, and hardened alloy steel. A typical grade is H13 per ASTM A681, known for high wear resistance.

How does orifice diameter affect the extrusion process?

Orifice diameter influences pressure drop and flow rate. Smaller diameters increase resistance, while larger diameters allow higher flow but may affect distribution uniformity.

Why is flow uniformity important and what tolerance is typical?

Flow uniformity ensures consistent product dimensions and quality. A typical tolerance is ±5%, but this must be verified for the specific application with the manufacturer.

Data Basis

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pressure:	Up to 100 MPa (depending on die plate material and orifice design)
flow rate:	0.1 to 500 kg/hr per orifice (varies with polymer viscosity and orifice diameter)
temperature:	50°C to 300°C (typical polymer processing range)
slurry concentration:	Not applicable (designed for polymer melts, not slurries)

Orifice Array

Product Specifications

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