{"id":1781,"date":"2019-11-28T09:14:27","date_gmt":"2019-11-28T09:14:27","guid":{"rendered":"https:\/\/www.fhopepack.com\/videos\/?p=1781"},"modified":"2026-10-27T13:50:42","modified_gmt":"2026-10-27T13:50:42","slug":"automatic-backpacking-and-shrinking-line","status":"publish","type":"post","link":"https:\/\/www.fhopepack.com\/videos\/automatic-backpacking-and-shrinking-line\/","title":{"rendered":"Automatic Shrink Packaging Line for Rectangular Block Products: Engineering Guide &#038; Operating Sequence"},"content":{"rendered":"<blockquote>\n<p><strong>Executive Summary<\/strong><\/p>\n<p>Packaging bulky rectangular block products\u2014ranging from furniture components and acoustic foam billets to high-density mattress panels\u2014presents persistent line bottlenecks when done manually. Hand wrapping invariably yields inconsistent film overlap, loose tail ends, trapped air pockets, and uneven package integrity across work shifts. This automated line eliminates manual variance through a continuous four-stage sequence: heavy-duty roller conveyor infeed, synchronized multi-axis film application, integrated top-press stabilization, and a calibrated hot-air shrink tunnel. Designed specifically for rigid, semi-rigid, and compressible rectangular items, the system applies uniform tension and balanced thermal exposure across all faces to output high-integrity, pallet-ready blocks. Project-specific parameters, machine dimensions, and film specifications are tailored to match targeted block sizing and throughput requirements.<\/p>\n<\/blockquote>\n<iframe loading=\"lazy\" width=\"940\" height=\"535\" src=\"https:\/\/www.youtube.com\/embed\/yCPj2iQ21Dk\" frameborder=\"0\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share\" allowfullscreen><\/iframe>\n<hr \/>\n<h2>Table of Contents<\/h2>\n<ul>\n<li><a href=\"#why-block-products-are-hard-to-pack\">Why block products are hard to pack<\/a><\/li>\n<li><a href=\"#how-the-line-runs\">How the line runs<\/a><\/li>\n<li><a href=\"#infeed-by-roller-conveyor\">Infeed by roller conveyor<\/a><\/li>\n<li><a href=\"#applying-the-film\">Applying the film<\/a><\/li>\n<li><a href=\"#press-and-shrink-station\">Press and shrink station<\/a><\/li>\n<li><a href=\"#heated-shrink-tunnel\">Heated shrink tunnel<\/a><\/li>\n<li><a href=\"#typical-configuration\">Typical configuration<\/a><\/li>\n<li><a href=\"#what-the-video-shows\">What the video shows<\/a><\/li>\n<li><a href=\"#selection-checklist\">Selection checklist<\/a><\/li>\n<li><a href=\"#operation-and-safety\">Operation and safety<\/a><\/li>\n<li><a href=\"#engineering-faq\">Engineering FAQ<\/a><\/li>\n<li><a href=\"#next-step\">Next step<\/a><\/li>\n<li><a href=\"#related-reading\">Related reading<\/a><\/li>\n<li><a href=\"#sources-and-standards\">Sources and standards<\/a><\/li>\n<\/ul>\n<p><a id=\"why-block-products-are-hard-to-pack\"><\/a><\/p>\n<h2>Why block products are hard to pack<\/h2>\n<p>Furniture assemblies, engineered foam blocks, insulation slabs, and mattress cores are bulky, heavy, and awkward to handle. Many feature soft, compressible edges combined with broad surface areas. When wrapped manually using handheld stretch film dispensers or stationary heat guns:<\/p>\n<ol>\n<li><strong>Excessive operator dependency<\/strong>: Film tension varies widely across operators and work shifts. One package might have excessive edge tension that crushes structural foam corners, while the next has loose film tails that snag on transfer conveyors.<\/li>\n<li><strong>Trapped air and bulk volume<\/strong>: Large rectangular products trap substantial air within the wrapping boundary. Without mechanical top-pressing during sealing, the trapped volume prevents tight shrink wrap, resulting in ballooned packages that shift during stacking.<\/li>\n<li><strong>Transport scuffing and moisture ingress<\/strong>: Loose film slips during long-distance logistics. Friction against trailer walls or wooden pallets creates surface scuffing on delicate painted surfaces or fabric upholstery, while unsealed seams allow dust and moisture to degrade core materials.<\/li>\n<\/ol>\n<p>The automated block packaging line eliminates these inconsistencies by enforcing repeatable mechanical feeding, controlled pneumatic pre-pressing, and precise thermal air-distribution around every product.<\/p>\n<p><a id=\"how-the-line-runs\"><\/a><\/p>\n<h2>How the line runs<\/h2>\n<p>The automated system routes each rectangular block continuously through four dedicated workstations without requiring manual intervention during the main packing cycle:<\/p>\n<ol>\n<li><strong>Infeed Transfer<\/strong>: The incoming block aligns onto a motorized live-roller bed, indexed by optical sensors for square, centered presentation.<\/li>\n<li><strong>Film Enclosure<\/strong>: Low-friction feed carriages lay polyethylene (PE) or polyolefin (POF) film cleanly over the top, bottom, and lateral faces with regulated unwind tension.<\/li>\n<li><strong>Pneumatic Press &amp; Seal<\/strong>: An overhead pneumatic platen compresses the block to evacuate internal air while a hot-knife sealing bar trims and joins the film perimeter.<\/li>\n<li><strong>Thermal Shrink Tunnel<\/strong>: High-velocity recirculating air heats the film uniformly to shrink tension, locking tightly over every flat surface and corner edge.<\/li>\n<\/ol>\n<p>Because machine parameters are preset in the central PLC, each cycle delivers identical structural containment, cycle time, and aesthetic finish regardless of production shifts.<\/p>\n<p><a id=\"infeed-by-roller-conveyor\"><\/a><\/p>\n<h2>Infeed by roller conveyor<\/h2>\n<p>The infeed section utilizes heavy-duty powered roller conveyors configured to handle payloads ranging from lightweight expanded polystyrene (EPS) to high-density wooden cabinets weighing up to 250 kg.<\/p>\n<ul>\n<li><strong>Roller Construction<\/strong>: Zinc-plated or polyurethane-sleeved carbon steel rollers prevent marring on pre-finished furniture panels while providing high frictional drive for consistent tracking.<\/li>\n<li><strong>Positive Indexing<\/strong>: Integrated photoelectric gate sensors detect the leading edge of the block to regulate conveyor speeds (typically 5 to 15 m\/min via variable-frequency drive), ensuring synchronized handoff to the downstream film wrapping station.<\/li>\n<li><strong>Centering Guides<\/strong>: Adjustable side-guide rollers align off-center products with the machine center line, avoiding asymmetrical film distribution.<\/li>\n<\/ul>\n<p><a id=\"applying-the-film\"><\/a><\/p>\n<h2>Applying the film<\/h2>\n<p>At the film station, roll-fed shrink film is applied around the advancing block. The mechanical carriage feeds film smoothly over the top, leading, and trailing faces, establishing the primary envelope:<\/p>\n<ul>\n<li><strong>Tension-Controlled Unwind<\/strong>: Magnetic particle or pneumatic friction brakes maintain consistent web tension across the entire roll diameter, preventing film wrinkling or tears along sharp corners.<\/li>\n<li><strong>Full-Enclosure Coverage<\/strong>: The cross-sealing and vertical feed system places enough film slack around oversized blocks to accommodate height variations while avoiding excessive waste margins.<\/li>\n<li><strong>Base Foundation for Shrinking<\/strong>: Uniform lateral film tension ensures that when the package enters the heating zone, the shrink percentage translates directly into structural clamping force rather than irregular, twisted seam lines.<\/li>\n<\/ul>\n<p><a id=\"press-and-shrink-station\"><\/a><\/p>\n<h2>Press and shrink station<\/h2>\n<p>Immediately following the film placement, the product enters an integrated press station. This assembly stabilizes compressible products and pre-tacks the film boundary:<\/p>\n<ul>\n<li><strong>Pneumatic Top Platen<\/strong>: A guided overhead pressure plate descends with adjustable pneumatic force (0.2 to 0.5 MPa). For compressible blocks like polyurethane foam or mattress cores, this press evacuates trapped air pockets and flattens uneven crowns.<\/li>\n<li><strong>Tension Stabilization<\/strong>: By pressing the film flush against the horizontal panels before and during perimeter sealing, the station prevents thermal ballooning inside the heating tunnel.<\/li>\n<li><strong>Taut Package Execution<\/strong>: The press ensures the film remains fully taut across all faces, eliminating baggy wrinkles and forming tight, balanced seals along the neutral center axis of the block.<\/li>\n<\/ul>\n<p><a id=\"heated-shrink-tunnel\"><\/a><\/p>\n<h2>Heated shrink tunnel<\/h2>\n<p>After perimeter sealing and stabilization, the package enters the recirculating hot-air shrink tunnel. This chamber supplies the thermal energy required to activate the film&#8217;s bidirectional memory:<\/p>\n<ul>\n<li><strong>Dual-Directional Airflow<\/strong>: Blower turbines force heated air through adjustable side and bottom nozzles, delivering balanced thermal convection around all six faces of the block simultaneously.<\/li>\n<li><strong>Precise Temperature Regulation<\/strong>: Digital PID controllers maintain internal air temperature within \u00b12 \u00b0C (typically set between 130 \u00b0C and 180 \u00b0C, depending on whether 40\u201380 \u00b5m PE or heavy-duty POF is specified).<\/li>\n<li><strong>Controlled Dwell Time<\/strong>: Mesh conveyor or silicone-sleeved roller chains advance the product through the tunnel at a continuous pace, giving the film adequate time to draw tight over structural edges without burning or puncturing soft foam substrates.<\/li>\n<\/ul>\n<p>The block emerges from the cooling tunnel discharge fully encapsulated, dimensionally rigid, and ready for immediate stacking or automated robotic palletizing.<\/p>\n<p><a id=\"typical-configuration\"><\/a><\/p>\n<h2>Typical configuration<\/h2>\n<p>The table below outlines common engineering parameters and operational ranges for our rectangular block shrink packaging installations:<\/p>\n<table>\n<thead>\n<tr>\n<th style=\"text-align: left\">System Parameter<\/th>\n<th style=\"text-align: left\">Typical Engineering Range<\/th>\n<th style=\"text-align: left\">Functional Purpose<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td style=\"text-align: left\"><strong>Compatible Products<\/strong><\/td>\n<td style=\"text-align: left\">Mattresses, foam blocks, furniture, panels<\/td>\n<td style=\"text-align: left\">Rectangular geometries with flat surfaces<\/td>\n<\/tr>\n<tr>\n<td style=\"text-align: left\"><strong>Max Block Width<\/strong><\/td>\n<td style=\"text-align: left\">600 mm \u2013 1600 mm (project-matched)<\/td>\n<td style=\"text-align: left\">Determines sealing jaw width and tunnel clearance<\/td>\n<\/tr>\n<tr>\n<td style=\"text-align: left\"><strong>Max Block Height<\/strong><\/td>\n<td style=\"text-align: left\">100 mm \u2013 600 mm<\/td>\n<td style=\"text-align: left\">Sets overhead platen stroke and tunnel chamber height<\/td>\n<\/tr>\n<tr>\n<td style=\"text-align: left\"><strong>Conveyor Speed<\/strong><\/td>\n<td style=\"text-align: left\">5 \u2013 15 m\/min (variable speed)<\/td>\n<td style=\"text-align: left\">Synchronizes throughput with plant production flow<\/td>\n<\/tr>\n<tr>\n<td style=\"text-align: left\"><strong>Film Material<\/strong><\/td>\n<td style=\"text-align: left\">PE flat film \/ POF shrink film (40\u2013100 \u00b5m)<\/td>\n<td style=\"text-align: left\">Heavy-duty puncture resistance and moisture barrier<\/td>\n<\/tr>\n<tr>\n<td style=\"text-align: left\"><strong>Tunnel Temperature<\/strong><\/td>\n<td style=\"text-align: left\">120 \u00b0C \u2013 190 \u00b0C (PID adjustable)<\/td>\n<td style=\"text-align: left\">Delivers balanced multi-face shrink ratio<\/td>\n<\/tr>\n<tr>\n<td style=\"text-align: left\"><strong>Overhead Press Force<\/strong><\/td>\n<td style=\"text-align: left\">500 N \u2013 3500 N (pneumatic, regulated)<\/td>\n<td style=\"text-align: left\">De-airs compressible foam and locks film stability<\/td>\n<\/tr>\n<tr>\n<td style=\"text-align: left\"><strong>Electrical Supply<\/strong><\/td>\n<td style=\"text-align: left\">380 V \/ 415 V, 3-Phase, 50\/60 Hz<\/td>\n<td style=\"text-align: left\">Main system drive and tunnel heating power<\/td>\n<\/tr>\n<tr>\n<td style=\"text-align: left\"><strong>Air Consumption<\/strong><\/td>\n<td style=\"text-align: left\">0.5 \u2013 0.7 MPa, 150 \u2013 300 NL\/min<\/td>\n<td style=\"text-align: left\">Powers pneumatic platen cylinders and seal cutters<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p><a id=\"what-the-video-shows\"><\/a><\/p>\n<h2>What the video shows<\/h2>\n<p>The accompanying demonstration video showcases a complete automatic shrink packaging line configured for large rectangular block components:<\/p>\n<ol>\n<li><strong>Automatic Conveyance &amp; Registration<\/strong>: Demonstrates how rectangular items travel smoothly on the live roller bed and pause precisely at the sealing zone.<\/li>\n<li><strong>Top-Press Downstroke<\/strong>: Illustrates the overhead pneumatic press plate depressing the top face of the block, firmly holding it flat while the heated impulse sealing bar cuts and seals the film envelope.<\/li>\n<li><strong>Tunnel Shrinking Action<\/strong>: Shows the continuous transition into the heated tunnel chamber, highlighting the immediate contraction of the film as recirculated convective air pulls the loose covering into a taut, glass-clear outer barrier.<\/li>\n<li><strong>Discharge Finish<\/strong>: Concludes with the finished block moving onto the exit conveyor, showing uniform, puncture-resistant edge wrap and secure seam integrity on every corner.<\/li>\n<\/ol>\n<p><a id=\"selection-checklist\"><\/a><\/p>\n<h2>Selection checklist<\/h2>\n<p>Use this engineering checklist when scoping an automated block shrink line for your production facility:<\/p>\n<table>\n<thead>\n<tr>\n<th style=\"text-align: left\">Evaluation Item<\/th>\n<th style=\"text-align: left\">Parameter to Confirm<\/th>\n<th style=\"text-align: left\">Engineering Consideration<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td style=\"text-align: left\"><strong>Block Dimensions (L \u00d7 W \u00d7 H)<\/strong><\/td>\n<td style=\"text-align: left\">Minimum and maximum values (mm)<\/td>\n<td style=\"text-align: left\">Dictates tunnel aperture size and platen cylinder stroke<\/td>\n<\/tr>\n<tr>\n<td style=\"text-align: left\"><strong>Compressibility &amp; Rigidity<\/strong><\/td>\n<td style=\"text-align: left\">Rigid board vs. flexible open-cell foam<\/td>\n<td style=\"text-align: left\">Determines required pneumatic press cylinder bore and pressure range<\/td>\n<\/tr>\n<tr>\n<td style=\"text-align: left\"><strong>Product Weight Range<\/strong><\/td>\n<td style=\"text-align: left\">Minimum to maximum unit mass (kg)<\/td>\n<td style=\"text-align: left\">Confirms conveyor roller pitch, shaft diameter, and gearmotor kW<\/td>\n<\/tr>\n<tr>\n<td style=\"text-align: left\"><strong>Film Chemistry &amp; Gauge<\/strong><\/td>\n<td style=\"text-align: left\">PE, POF, or barrier films (thickness in \u00b5m)<\/td>\n<td style=\"text-align: left\">Dictates heating element wattage, tunnel length, and seal-wire coatings<\/td>\n<\/tr>\n<tr>\n<td style=\"text-align: left\"><strong>Target Output Rate<\/strong><\/td>\n<td style=\"text-align: left\">Blocks per minute \/ hour<\/td>\n<td style=\"text-align: left\">Determines conveyor drive velocity and tunnel dwell time<\/td>\n<\/tr>\n<tr>\n<td style=\"text-align: left\"><strong>Plant Power &amp; Utilities<\/strong><\/td>\n<td style=\"text-align: left\">Operating voltage, phase, pneumatic line flow<\/td>\n<td style=\"text-align: left\">Ensures full compatibility with existing factory infrastructure<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p><a id=\"operation-and-safety\"><\/a><\/p>\n<h2>Operation and safety<\/h2>\n<p>The packaging line is operated via a centralized Siemens or Delta PLC touchscreen HMI. Standard recipe storage allows operators to switch between different block heights and lengths with single-touch automatic adjustments.<\/p>\n<ul>\n<li><strong>Machinery Safety Standards<\/strong>: Built in strict compliance with ISO 12100:2010 and EN 415-4\/10 standards for packaging machinery.<\/li>\n<li><strong>Perimeter Guarding &amp; Interlocks<\/strong>: Transparent polycarbonate access panels and perimeter wire mesh prevent operator contact with heated tunnel components and moving sealing jaws.<\/li>\n<li><strong>Safety Light Curtains<\/strong>: Optical curtains (Category 4, PL e per EN ISO 13849-1) monitor infeed and outfeed openings; breaking the optical beam immediately cuts pneumatic and drive power to hazardous moving assemblies.<\/li>\n<li><strong>Emergency Stop Protocol<\/strong>: Hardwired E-stop pushbuttons are placed at the primary HMI station, sealing station, and tunnel exit to trigger instantaneous fail-safe pneumatic venting and mechanical braking.<\/li>\n<\/ul>\n<p><a id=\"engineering-faq\"><\/a><\/p>\n<h2>Engineering FAQ<\/h2>\n<p><strong>Q: Can this line handle both rigid furniture panels and soft, compressible foam blocks?<\/strong>\nA: Yes. The pneumatic top-press station includes a precision pressure regulator and variable stroke limiters. For rigid panels, it acts as a light clamp (0.1\u20130.2 MPa) to prevent product movement during sealing; for soft foam or mattress cores, pressure can be increased (up to 0.5 MPa) to evacuate internal air before heating.<\/p>\n<p><strong>Q: Why is an overhead press station necessary prior to the heat tunnel?<\/strong>\nA: Large rectangular surfaces trap substantial air inside the sealed film envelope. If an unpressed, air-filled package enters the heated tunnel, the expanding hot air resists film contraction, producing large loose pockets and ballooning. Pre-pressing ensures the film remains fully taut and the package remains compact.<\/p>\n<p><strong>Q: What film materials are compatible with this system?<\/strong>\nA: The system supports both Low-Density Polyethylene (LDPE, 40 to 100 \u00b5m) for heavy-duty, scuff-resistant protection and Polyolefin (POF, 19 to 35 \u00b5m) for high-clarity retail presentations.<\/p>\n<p><strong>Q: How does the tunnel prevent soft products from melting or deforming?<\/strong>\nA: The shrink tunnel utilizes high-velocity air circulation rather than static radiant heat. Adjustable louvers direct hot air along the outer film boundaries rather than concentrating heat on the product core. In addition, an automatic outfeed conveyor ejects packages immediately if downstream line stoppages occur.<\/p>\n<p><strong>Q: What routine maintenance is required?<\/strong>\nA: Daily inspections include cleaning the Teflon coating on the sealing jaws and wiping photo-eye sensors. Weekly tasks involve inspecting pneumatic cylinder seals, checking drive chain tension, and cleaning the tunnel intake air filters to ensure unimpeded air circulation.<\/p>\n<p><a id=\"next-step\"><\/a><\/p>\n<h2>Next step<\/h2>\n<ol>\n<li><strong>Submit Product Specs<\/strong>: Email your exact block dimensional matrix (minimum and maximum L \u00d7 W \u00d7 H), unit weights, and daily throughput targets to <strong>info@fhopepack.com<\/strong>.<\/li>\n<li><strong>Engineering Review &amp; 2D\/3D Layout<\/strong>: Our mechanical design team will generate a customized packaging line proposal and plant layout drawing within 48 hours.<\/li>\n<li><strong>Factory Acceptance Testing (FAT)<\/strong>: Ship sample blocks to our technical center for film trial evaluation, seam-integrity burst testing, and complete cycle-time verification.<\/li>\n<\/ol>\n<p><a id=\"related-reading\"><\/a><\/p>\n<h2>Related reading<\/h2>\n<ul>\n<li><a href=\"https:\/\/www.fhopepack.com\/videos\/automatic-film-sealing-machine-application-on-panel-doo\/\">Automatic film sealing machine on panel and door<\/a><\/li>\n<li><a href=\"https:\/\/www.fhopepack.com\/videos\/plates-automatic-shrink-packaging-machine-for-c\/\">Automatic shrink packaging machine for plates<\/a><\/li>\n<li><a href=\"https:\/\/www.fhopepack.com\/videos\/automatic-panel-shrink-packing-machine\/\">Automatic panel shrink packing machine<\/a><\/li>\n<li><a href=\"https:\/\/www.fhopepack.com\/Products\/\">FHOPE packing machinery product lines<\/a><\/li>\n<\/ul>\n<p><a id=\"sources-and-standards\"><\/a><\/p>\n<h2>Sources and standards<\/h2>\n<ul>\n<li><a href=\"https:\/\/www.iso.org\/standard\/51528.html\">ISO 12100:2010 Safety of machinery \u2014 General principles for design \u2014 Risk assessment and risk reduction<\/a><\/li>\n<li><a href=\"https:\/\/www.iso.org\/\">EN 415-4: Safety of packaging machines \u2014 Palletisers and depalletisers, formers, and shrink wrappers<\/a><\/li>\n<li><a href=\"https:\/\/www.nen.nl\/en\/nen-en-415-10-2014-en-191845\">EN 415-10:2014 Safety of packaging machines \u2014 General requirements<\/a><\/li>\n<li><a href=\"https:\/\/www.iso.org\/standard\/83615.html\">EN ISO 13849-1:2023 Safety of machinery \u2014 Safety-related parts of control systems<\/a><\/li>\n<\/ul>\n<p><em>FHOPE automatic block packaging and shrinking line technical specification document. Tailored layout and machine parameters confirmed per project application.<\/em><\/p>\n<p><em>Last reviewed: 2026-10-10<\/em><\/p>","protected":false},"excerpt":{"rendered":"<p>Executive Summary Packaging bulky rectangular block products\u2014ranging from furniture components and acoustic foam billets to high-density mattress panels\u2014presents persistent line bottlenecks when done manually. Hand wrapping invariably yields inconsistent film overlap, loose tail ends, trapped [&hellip;]<\/p>","protected":false},"author":1,"featured_media":2178,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_seopress_titles_title":"Automatic Backpacking and Shrinking Line | FHOPE","_seopress_titles_desc":"Automatic backpacking and shrinking line for rectangular blocks from 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