The material known as shrink wrap is a clear plastic wrap that is used to package millions of products around the world. Shrink wrap is called shrink wrap because it shrinks around the product being packaged when it is exposed to heat.
Each of these three wraps can be co-extruded into multilayer wraps with different additives offering specific barrier properties required for shelf-life or appearance. Shrink wraps can be formed into flattened roll stock, bags, overwrap, banding, and tubing, and add a form of tamper-resistant protection to packaged goods. If you aren’t sure that you are using the ideal wrap for your application, here’s a breakdown of the three:
PVC Shrink Wrap
Once the most commonly-used shrink packaging material in the world due to its lightweight and inexpensive multi-purpose capabilities, PVC Shrink wrap has since taken a backseat to PE and POF for many reasons. Most specifically due to the dangers in health during creation and incineration, and sustainability.
In its rigid form, PVC is durable and is used in many applications, including construction projects and houseware products. In terms of packaging, PVC is seen in rigid applications including blister and clamshell packaging, & flexible applications including shrink wrap, bagging. Polyvinyl chloride is a combination of three elements, carbon, hydrogen, and chlorine.
It is recommended for use in well-ventilated facilities due to the strong, harmful odors that are released when heated. Due to its chemical composition and these harmful byproducts released during its creation, and decomposition for that matter, PVC has been banned in many countries.
POF Shrink Wrap
Polyolefin shrink is an extremely durable and versatile ‘premium’ shrink wrap. It has taken the place of PVC mentioned above in many applications and is also an FDA-approved food-safe material. Polyolefin materials are available with different characteristics, including cross-linked wrap that provides high-tensile strength and incredible clarity for high-speed packaging applications. The cross-linked wrap also prevents buildup on sealing components of your packaging machinery.
With added strength, the ability to create longer rolls of wrap with thinner gauges available allows for less roll change-over and increased efficiency and productivity. Polyolefin shrink wrap has excellent puncture resistance and seal strength, allowing for irregular-shaped items to have excellent protection throughout their supply chain life-cycle.
The versatility and fairly low cost that POF offers for multiple machines and packaging forms make it a go-to form of protective packaging manufacturers of any size. In some instances POF will need perforations added to the wrap; tiny holes added to the wrap before application which allows air to escape during the shrinking process for a smooth package. Pre-perforated shrink wrap is available by many suppliers for this reason.
PE Shrink Wrap
Polyethylene is a type of polyolefin, meaning it is a single monomer wrap that is formed with the addition of ethylene during polymerization. PE is used in several forms of flexible protective packaging including shrink wrap and stretch wrap and performs very differently for each.
There are multiple forms that PE can take, but the three most common would be Low-Density Polyethylene (LDPE), Linear Low-Density Polyethylene (LLDPE), & High-Density Polyethylene (HDPE). Each of these is best used in different industrial applications, but for shrink packaging, LDPE would be the most common form.
The benefits of using LDPE over the other forms of shrink packaging would be added strength and durability for heavier, larger items, like multipacks of beverages. These wraps are also printable and can have excellent graphics added while still maintaining the image and the strength required.