HEAVY-DUTY CO-EXTRUSION FEED BLOCKS

• Model/ID References: A-B-B, E-6726-3LSP-01, 01-6726, E-6726-0303-01, D-6726-3102-01, E-6726-3L8P-01
• Dimensions: 15 inches depth, 21 inches height, 7 inches width/diameter
• Heavy-duty steel construction
• Precision machined with multiple flow channels
• Designed for multi-layer co-extrusion

Description

This is a high-quality co-extrusion feed block designed for combining and distributing multiple polymer melt streams into a uniform layered flow. The part numbers and design indicate it is configured for A-B-B style layering, ideal for films and sheets requiring two or three-layer constructions.

What It Does

The feed block merges polymer melts from different extruders and arranges them into precise layered structures before entering the die. This ensures exact layer distribution, thickness control, and adhesion between dissimilar materials.

Capabilities

• Supports A-B-B co-extrusion layering
• Handles multiple polymers with different viscosities
• Allows for fine-tuning of individual layer ratios
• Can be integrated with a wide range of flat dies and extrusion systems

Core Functions

• Combines multiple polymer streams
• Aligns and stabilizes melt flows into a single, consistent layered sheet or film
• Maintains uniform distribution across the width of the product
• Provides flexibility in product design for barrier layers, adhesive layers, or protective coatings

Design Features & Benefits

• Precision-machined channels for accurate melt flow control
• Heavy-duty block for durability under high pressure and temperature
• Modular design for easier integration into existing lines
• Capable of handling a wide range of thermoplastics including polyethylene, polypropylene, EVA, and specialty resins
• Enhances product performance by maintaining strong interlayer bonding and uniform thickness

Applications & Industries

• Packaging films (barrier films, multi-layer films, laminates)
• Sheet extrusion for automotive, construction, or consumer products
• Medical and pharmaceutical packaging requiring barrier properties
• Industrial films requiring multiple functional layers (UV protection, chemical resistance, adhesives)

Machine Overview & Summary

This co-extrusion feed block is a precision-engineered unit designed to merge multiple melt streams into a seamless layered structure. Its A-B-B configuration provides excellent flexibility for packaging and industrial applications where a strong core layer is supported by outer protective or functional layers. With a rugged design, accurate flow distribution, and wide application range, this feed block is a valuable asset for any extrusion line seeking to produce high-quality multi-layer films or sheets.

Machine Overview & Summary

This is a heavy-duty co-extrusion feed block, manufactured by Jhn & Tesch, Lüdenscheid (Germany), serial number Nr. 2.83. It is labeled for V 220 W 500 / W 600 (likely nominal voltages or dimensions). The unit is constructed of robust metallic castings and precision-machined internal flow channels, intended for combining multiple polymer melt streams into a multi-layer composite structure prior to entering an extrusion die. With its substantial size (approx. 13 in depth, 8 in width, 7 in diameter for certain flanges), it is suited for industrial-scale film, sheet, or coating lines.

Specifications

• Manufacturer: Jhn & Tesch (Lüdenscheid, Germany)
• Model / Serial: Nr. 2.83
• Voltage / Marking: V 220 W 500 (also marked W 600)
• Depth (front to back): ~13 inches
• Width: ~8 inches
• Circular flange / diameter section: ~7 inches
• Inlet / outlet interface: multiple ports (as seen in photos)
• Material: heavy-duty metal (likely steel or alloy casting)
• Finish: factory-machined, with bolt flanges and mounting features
• Condition: used, showing surface rust and wear; internal passages need inspection / cleaning

Description

This is a precision feed block used in polymer co-extrusion operations. It receives molten polymer streams from two or more extruders, merges them in a controlled manner, and delivers a composite melt with the desired layer configuration to the downstream die. The device is engineered for accurate flow distribution, laminar merging, and the capacity to fine-tune layer proportions. Its solid cast housing and internal flow geometry ensure consistent performance and long service life when properly maintained.

What It Does

• Accepts multiple melt streams and merges them into a single layered flow
• Controls the layer thickness, sequence, and flow balance
• Serves as the “mixing manifold” or “layer combining” unit before the die
• Interfaces between extruders and the extrusion die (sheet, film, coating)

Capabilities

• Multi-layer co-extrusion: can combine 2 or more polymer melts
• Adjustable layer distribution (depending on internal geometry)
• Supports medium to high throughput lines (depending on die and extruder sizing)
• Suitable for polymers with fairly similar melt viscosity and temperature ranges
• Stable under steady-state conditions with proper thermal control

Core Functions

• Melt channel merging
• Flow balancing across the width
• Layer profiling (to correct nonuniform flow)
• Distribution to downstream die manifold
• Sealing and alignment via flange/bolt interfaces

Design Features & Benefits

• Robust construction: heavy cast metal body resists deformation and thermal cycles
• Precision internal geometry: channels-and-inserts are machined to ensure minimal dead zones and maintain laminar flow
• Flanged inlets/outlets: ease of integration into existing extrusion line
• Removable inserts (likely): many feedblocks use replaceable inserts or modules for easier maintenance or flow adjustment. (Patent literature shows removable flow distribution modules in feedblocks for cleaning or replacement.) 
• Potential for adjustability: some co-extrusion feedblocks allow active profiling using sliding vanes or adjustable elements to fine-tune layer thickness during operationGood heat capacity / thermal stability: thick metal walls help buffer against temperature fluctuations
• Ease of maintenance: if designed with modular flow inserts or removable covers, access for cleaning and repair is straightforward. 

Applications & Industries

• Multi-layer film and sheet extrusion (e.g. barrier films, laminates)
• Coating or laminating lines combining polymer layers or functional barrier layers
• Packaging (food packaging, blister films, barrier films)
• Technical films for electronics, photovoltaics, barrier membranes
• Industrial polymer sheet production
• Research or pilot-scale coextrusion setups

 Machine Overview & Summary

This is a Randcastle RCFBP (co-extrusion feed block) module, likely used in a multi-layer sheet or film production line. The “RCFBP” naming suggests it’s part of Randcastle’s modular feed block / manifold family (“RCF” perhaps for “Randcastle CoFeed” or “Randcastle Coextrusion Feed Block” plus “P” variant). It is designed to accept multiple melt streams, merge them into a composite multi-layer structure, and feed them into a downstream die or slot lip for sheet / film / coating applications.
From your photos, the feed block is a rectangular plate with multiple inlet / outlet ports (holes) and mounting surfaces. Its dimensions (measured) and bolt patterns will help potential buyers or integration engineers match it to melt lines or downstream dies.

Description

This feed block is a multi-channel modular module that takes two or more polymer melt streams and combines them in a controlled way into a single layered melt flow, maintaining layer uniformity and enabling adjustment of layer thickness. It is a vital component in co-extrusion systems, especially for cast film, sheet, coating, and laminate lines.
It features external bolts / ports for melt feeds, and a plate section with multiple holes (likely for melt channel routing, balancing pins or vanes). The modular design of Randcastle feed blocks allows layer control, flow balancing, and possibly pin exchange without full disassembly.

What It Does

• Combines multiple resin melt streams into a composite melt with defined layers (e.g. A/B, A/B/A, A/B/C, etc.).
• Balances flow velocities across each melt channel to avoid layer distortion.
• Delivers the composite melt to a downstream die (slot or film die) for forming sheet or film.
• Allows fine tuning / adjustment of layer thicknesses via internal valves, pins, or selector inserts.
• Enables switching or turning off certain layers (depending on design) by changing pins or inserts.

Capabilities

• Multi-layer coextrusion (commonly 2 to 5 layers; some Randcastle modular blocks support up to 7 or more). 
• Modular layer configuration: you can reconfigure layer stack, insert or remove layers via pin access. 
• External pin access for layer adjustments without full teardown (i.e. you can fine tune flows while the block is installed). 
• Flow balancing / velocity matching across channels for mismatched resin viscosities.
• Ability to change the manifold or inserts to match different viscosities or layer designs.
• Compatible with Randcastle’s cast film / coating / lamination lines (bench / floor models). 

Core Functions

• Layer Sequencing / Selection: internal paths within the block route each inlet melt stream to the appropriate layer position (e.g. top, core, bottom).
• Flow Equalization & Pin Adjustment: balancing pins or valves allow small corrections to flow or velocity mismatches among layers.
• Melt Confluence / Merge Section: smooth transition zone where the separate melt channels merge before the die.
• Mounting / Flange Interface: bolt or mount surfaces to connect melt pipes (from extruders) and connect to downstream die.
• Thermal / Heater Provisions (if applicable): may include heater bands or temperature control channels to maintain melt temperature and avoid thermal gradients (though many feed blocks are passive, heated externally).
• Modularity / Expandability: ability to add or remove layer modules or pins to adapt to different coextrusion designs without full replacement.

Design Features & Benefits

• Interchangeable Manifold System: Randcastle uses a design where manifolds or inserts can be swapped to suit different viscosity or layer designs, improving uniformity. 
• External Pin Access: ability to access balancing pins from outside, so you do not need to fully disassemble the feed block to make adjustments.
• Modular & Expandable: supports adding or removing layers / extruder inputs over time without replacing the whole feed block. 
• Short Common Flow Path: Randcastle’s multi-manifold designs share a relatively short common flow path to minimize residence time and thermal degradation. 
• Adaptable to Viscosity Mismatch: design can compensate for differences in melt viscosity among layers via pin adjustments. 
• Robust Construction: built for industrial use, likely using hardened steels, precision machining, and tight tolerances.
• Versatility in Layer Structures: support for different layer stack ideas (e.g. ABCBA, ABA, etc.) depending on pin configuration. 

Applications & Industries

• Cast Film & Sheet Production: for multi-layer films, barrier films, packaging, laminates.
• Extrusion Coating & Lamination: applying polymer layers onto substrates (paper, film, foil) in coating / lamination lines.
• Barrier Film / Protective Films: where you need layers of different materials (e.g. barrier, sealant, structural).
• R&D / Pilot / Lab Extrusion Lines: often used in research or development setups to test layer combinations or novel materials 
• Specialty Polymer / Compounding Lines: combining functional or filled resins in discrete layers (e.g. adding compatibilizers, adhesives, barrier resins).
• Packaging & Flexible Film Industry: food packaging, flexible pouches, shrink films, barrier packaging.
• Medical / Pharmaceutical Film: in cases requiring multilayer films (e.g. drug delivery layers, moisture barriers).

Specifications (Based on Your Measurements + Inferred)

• Model / Designation: Randcastle RCFBP feed block (coextrusion type)
• Plate / Block Dimensions: (from your photos) the main rectangular plate appears ~ 8 to 9 inches (≈ 200-230 mm) in one direction (width) (as measured by your tape).
• Circular Flange/Diameter Section: 3 inches 
• Bolt / Port Hole Pattern: multiple circular ports (six or more) plus a central port, with balancing holes / bolt provisions.
• Material Construction: likely hardened tool steel or stainless / alloy steel suitable for polymer melt environments
• Layer Capability: likely 2 to 5 layers (depending on design), possibly up to 7 in advanced modular versions.
• Melt Ports / Inlets: multiple inlet flanges or ports (to receive melt from extruders) — the holes in the block correspond to melt channels or bolt holes.
• Outlet / Die Interface: one outlet side that matches downstream die or adapter (slot / lip die)
• Thermal Control: may support external heater bands or thermal jacket (not obvious in photos)
• Adjustability: external balancing pins or vanes accessible from outside
• Adaptability: modular inserts / manifolds for different layer designs
• Compatibility: works with Randcastle cast film / coating lines (bench or floor) and their extruder / manifold system

Manufacturer: Cloeren Company

• Model/Part No.: 86-166-28
• Engraved No.: EN E-428-5201-01
• U.S. Patent Numbers: 4,152,387 and 4,197,069
• Approximate Dimensions: ~12” width x ~21” length (based on tape measurement shown in photos)
• Circular Flange/Diameter Section: 4 inches 
• Construction: Heavy-duty precision-machined steel body
• Origin: Made in U.S.A.

Description

This is a Cloeren co-extrusion feedblock used in plastic extrusion lines. Feedblocks are engineered devices that combine multiple polymer melt streams into a uniform, layered structure before they enter the extrusion die. Cloeren is a leading manufacturer in feedblock technology, well known for precision and reliability in film, sheet, and coating extrusion applications.

What It Does

The feedblock enables the precise combination of two or more molten polymer streams into a controlled, multilayer configuration. It distributes and arranges these layers evenly across the width of the extrusion die, ensuring high-quality end products with consistent layer thickness and adhesion.

Capabilities

• Handles multiple polymer melt streams simultaneously
• Configures coextruded layers in uniform thicknesses
• Compatible with various extrusion die setups for film, sheet, and coating
• Maintains melt uniformity and reduces defects such as streaking, gels, or uneven layering
• Adjustable distribution for fine-tuning layer ratios

Core Functions

• Layer combining and distribution of different polymer melts
• Flow channeling and streamlining for optimal melt homogeneity
• Integration with extrusion lines for producing multilayer film, sheet, or coating structures
• Design Features & Benefits
• Cloeren’s patented flow channel designs for superior layer uniformity
• Robust steel construction for long-term industrial use
• Compact block design for integration into existing extrusion lines
• Patented technology ensures consistent quality across the web width
• Reduces scrap and material waste by maintaining precision layer control

Applications & Industries

• Packaging industry (multilayer films and barrier films)
• Automotive (decorative and protective sheet)
• Construction (protective and specialty sheets)
• Consumer products (multilayer laminates, coatings)
• Medical and pharmaceutical packaging requiring precise barrier layers

Machine Overview & Summary

This Cloeren co-extrusion feedblock is a precision-engineered component designed to combine multiple polymer melts into uniform, multilayer structures for extrusion processes. Built in the USA and covered under Cloeren’s patented technology, it is suited for high-performance film, sheet, and coating production across various industries. With its robust build, patented flow distribution, and proven reliability, this feedblock is an essential tool for companies seeking consistency and quality in multilayer extrusion applications.

Custom-Built Co-Extrusion Feed Block (3-Extruder Adaptable)

Specifications

• Type: Custom-built co-extrusion feed block
• Extruder Connections: Adaptable to 3 extruders
• Dimensions:
• Approx. 18” wide (see measurement photos)
• 10” central block height
• Heavy-duty steel construction
• Heating: Integrated with multiple cartridge heaters and thermocouple ports
• Electrical: Equipped with heating zones and wiring for process temperature control
• Condition: Used, solid mechanical integrity, requires cleaning/refurbishing

Description

This is a custom-built co-extrusion feed block designed for use in plastic extrusion lines. It provides the ability to combine and layer materials from three separate extruders into a single melt stream, which is then delivered to the extrusion die. Its robust, heavy-duty design makes it suitable for industrial production environments requiring multi-layer film, sheet, or coating extrusion.

What It Does

• Accepts melt streams from up to three different extruders
• Precisely distributes, layers, and directs the combined melt flow into an extrusion die
• Maintains uniform flow and consistent temperature control to ensure product quality
• Provides adaptability for different polymers and layer thicknesses

Capabilities

• Handles multi-material extrusion for co-extruded films, sheets, or coatings
• Supports three extruder inlets with customizable layering configurations
• Withstands industrial production rates and high processing temperatures
• Suitable for thermoplastics such as polyethylene, polypropylene, PVC, PET, and specialty resins

Core Functions

• Melt stream management and distribution
• Multi-layer co-extrusion capability (up to 3 layers)
• Heat-controlled zones for precise temperature regulation
• Structural support for continuous production operations

Design Features & Benefits

• Adaptability: Can be configured for different resin types and layering requirements
• Heavy-Duty Construction: Built for long-term durability in demanding environments
• Integrated Heating: Multiple cartridge heaters and thermocouple ports for stable melt temperature control
• Flexibility: Fits a wide range of extrusion lines and die assemblies
• Efficiency: Reduces material waste by ensuring proper layer distribution

Applications & Industries

• Plastic film extrusion (multi-layer packaging films)
• Sheet extrusion (multi-layer rigid or flexible sheets)
• Coating and laminating applications
• Packaging, automotive, and construction materials industries
• Specialty multi-layer products requiring barrier layers or performance enhancements

Machine Overview & Summary

This custom-built co-extrusion feed block is engineered for versatility and durability in multi-layer extrusion processes. With the capacity to integrate up to three extruders, it allows for the production of complex layered products in film, sheet, or coating applications. Its rugged build and integrated heating system ensure consistent performance under demanding operating conditions. This unit is ideal for processors seeking to expand their co-extrusion capabilities, optimize product design, and increase production flexibility