Shrink wrap is a heat-applied plastic film that shrinks tightly around a single product or a multi-pack bundle, protecting it and making it tamper-evident. Stretch wrap (also called stretch film or pallet wrap) is a stretchable plastic film applied without heat around a full pallet load to unitize multiple boxes into one stable, transportable unit. Shrink wrap protects and presents individual items or small bundles. Stretch wrap secures and contains larger palletized loads for shipping.
What Is Shrink Wrap?
Shrink wrap is a plastic film that shrinks tightly around a product once heat is applied, typically through a shrink tunnel. Once shrunk, the film holds its shape, encases the item closely, and provides tamper evidence, meaning any attempt to open the package is visible. Shrink wrap also requires minimal storage space compared to rigid packaging and, because it is light compared to cardboard, it can reduce transportation costs. PACKPRO sources high-performance shrink films for consistent sealing and shrinking through crosslinking technology, which supports strong, repeatable seals across production runs. High-yield, thin-gauge films are built for lightweight products, while multilayered, high-performance crosslinked films are designed for multi-packing and unitizing products. Opaque shrink films are also available for applications that need to conceal contents, such as sensitive documents or high-value products. Shrink wrap is applied using shrink wrap machines, which include L-bar sealers, intermittent motion side sealers, continuous motion side sealers, vertical wrappers, and shrink tunnels. These systems support automatic film splicing at speeds up to 200 feet per minute without interrupting the wrapping process, and some side-seal shrink wrappers are optimized for throughput up to 65 packages per minute. For multi-pack applications, shrink bundlers handle sleeve wrap and bundle formats where the package has open ends, sometimes called “bull’s eyes.” Shrink bundlers can reduce packaging costs by eliminating the need for cartons, trays, or cases, and they are available in both intermittent and continuous motion configurations to match different production speeds.
What Is Stretch Wrap?
Stretch film, also called pallet wrap, has one main purpose: unitizing products so they move through the distribution channel in the condition they were manufactured in. Unlike shrink wrap, stretch film is not heated. It is mechanically stretched and wrapped around a load, and its elasticity creates a cling and containment force that holds boxes together on a pallet. High-performance stretch films are engineered to stretch up to 300%, and some machine-grade films, such as one-side cling films, are engineered to stretch up to 250% while maintaining puncture resistance and cling. Stretch wrapping equipment can extend this further, with powered pre-stretch film delivery systems capable of pre-stretching film up to 400%, which reduces the amount of film needed per load. Stretch wrapping systems come in several formats, including turntable, rotary arm, orbital, and robotic wrappers. Automatic stretch wrappers are built for speed and consistency in high-volume facilities, while PACKPRO’s expertise with robotic systems like the Robot S7 platform is reported to improve productivity by 25% or more through pre-stretch and containment technology.
Shrink Wrap vs. Stretch Wrap: Key Differences
Where Automation Fits In
Both shrink and stretch packaging processes are increasingly automated, and the data shows why. According to PMMI, (The Association for Packaging and Processing Technologies) U.S. packaging machinery sales reached $11.3 billion in 2024, with a growth forecast of 2.2% for 2025 as manufacturers invest in automation and digital solutions to offset labor shortages and increase throughput. The Canadian packaging machinery market reached $1.2 billion in sales that same year, with a comparatively flat growth rate of 0.8% forecast for 2025, reflecting a market that PMMI describes as maintaining a strong base while facing similar labor and efficiency pressures as its U.S. counterpart (PMMI 2025 Packaging State of the Industry, via Packaging World). PMMI’s 2025 Economic Outlook also found that more than half of companies in the sector are actively investing in automation specifically to address workforce gaps and improve operational speed. On the shrink side, automation shows up as automatic film splicing, integrated labelers, and shipping software that produce ready-to-ship packages without manual tray assembly. On the stretch side, it shows up as programmable wrap cycles, powered pre-stretch delivery, and robotic or mobile wrappers that reduce both film usage and manual labor per pallet. For operations managing rising volumes with the same headcount, this is often where the largest efficiency gains are available.
Which One Does Your Packaging Line Need?
The choice is not usually either-or. Many operations use both: shrink wrap for individual products or retail-ready multi-packs, and stretch wrap to unitize the resulting cases onto pallets for distribution. The right fit depends on product size and fragility, whether tamper evidence or product visibility matters, line speed requirements, and how the product needs to look when it reaches the shelf versus how it needs to travel through the supply chain. PACKPRO’s team can conduct a packaging audit to identify the best fit for your specific facility. Getting the film gauge, machine type, and automation level right affects material cost, line speed, and product protection all at once. A packaging line running the wrong film gauge or an under-automated wrapping step can lose efficiency in ways that are not obvious until they are measured. Contact PACKPRO to discuss optimizing your shrink or stretch packaging process.
