Single-Wound VS Centerfold Shrink Film: What Is The Difference?
So, you have been tasked with purchasing shrink film for your company's packaging needs. You went to Google, searched for shrink film and you found two common types of this material. Single-wound shrink film and centerfold shrink film.
Now what? Which type of shrink film is right for your products? Is one or the other more appropriate for your packaging line? If so, how do you identify which type of shrink film is right for you?
Sure, you could just order a roll of each and test them on your products. Or, you could roll the dice on one or the other and hope it works out. But, wouldn't you rather choose the correct shrink film for your products? Then you will have to understand the differences between these packaging materials.
Industrial Packaging has been selling shrink films for decades while providing our customers with quality information to make proper buying decisions. When it comes to your shrink film needs, you will be able to find the resources you need to source your films here.
In this article, we will help you to figure out if single-wound or centerfold shrink film is right for you.
What Is Single-Wound Shrink Film?
Single-wound shrink films come on a flat sheet which is wrapped onto a roll. Single-wound films are also known as single-layer or flat films. They are commonly used for the packaging of various types of consumer products. These films are always wound onto a core.
Our single-wound films range from 45 gauge to 60 gauge although, other sizes are available upon request (the smaller the gauge the thinner the film). On average, stock sizes can run from 8 inches up to 32.5 inches in width (other widths are available upon request).
Films average approximately 11,660 to 23,320 feet depending on the width of the film (the gauge of the film will determine the footage of the roll). There are custom sizes available as well, you can speak to one of our reps if interested.
Polyolefin film is great for multi-packs, toys and games. Some PVC is food or meat grade. All polyolefin films are food-grade and FDA approved.
When packaging products in single-wound shrink film, the product is sealed on the front and back of the film. Generally speaking, single-wound film has an electrical or static seal on the bottom. This is to hold the overlapping layers of the film together.
It should be noted that some single-wound films are designed to meet mailing standards and USPS T-3204 regulations. These are set by the United States Postal Service. These specialized films are approved for similar applications which require film that is more than 1 mil in thickness.
You can buy individual rolls, multiple cases of rolls, or pallet quantities of single-wound shrink film.
What Is Centerfold Shrink Film?
Center-folded shrink film is a type of shrink film which is folded lengthwise in half. It is then formed into a roll. A 20-inch-wide center-folded roll would unfold into 40-inch width.
PVC is good for lightweight products and general-purpose packaging. Some PVC is food or meat grade. Polyolefin is great for multi-packs and game boards. Also, all polyolefin films are food-grade, and FDA approved.
The centerfold films average between 8 inches to 32.5 inches in width (other widths are available upon request). They range from 45 gauge to 100 gauge in thickness although, other gauges are available upon request (the smaller the gauge the thinner the film). The average footage on a roll is determined by the gauge of the film. There are custom sizes available as well. You can speak to one of our reps if interested in custom sizes.
Center-folded shrink film is commonly used in packaging applications that use tabletop shrink machinery. However, centerfold film can run on any machine that can accommodate centerfold shrink film.
When using centerfold film, the sealer will seal the front, the back, and the side of the film prior to being sent into the heat tunnel.
It should be noted that some centerfold films are designed to meet mailing standards and USPS T-3204 regulations. These are set by the United States Postal Service. These specialized films are approved for similar applications which require film that is more than 1 mil in thickness.
You can buy individual rolls, multiple cases of rolls, or pallet quantities of centerfold shrink film.
Need Help Choosing The Right Shrink Film?
Applications For Single-Wound VS Centerfold Shrink Film
Some applications (for example, consumer goods, food, electronics, and game boards) will fit either single-wound or centerfold shrink film.
When packaging your products with centerfold film, generally the seam is visible on three sides. With single wound, the seal appears on two sides with an overlapped seam on the bottom.
Centerfold can run on various types of side or L-sealers. Single-wound film applications would be run through a horizontal form, fill, and seal machine. The main difference here, is the type of machinery that these films are commonly run on.
When it comes to the product packaging itself, the aesthetic of the package can be a concern based on where the seams are placed. Depending on how you want your packaging to look on the shelf, you will need to decide where you want your seams to show and choose the correct application.
Single-Wound Or Centerfold Shrink Film: Which One Is Right For Me?
If the appearance of your product is a key consideration, and you want the least amount of seams showing, single-wound would be the better choice for your packaging applications. If you are running a taller package, centerfold film accommodates this type of package better.
More Resources For Sourcing Shrink Film
Would you like a recommendation from a packaging professional? If so, consider reaching out to one of our packaging experts. They will be able to help you choose the right film regardless of whether you buy from us or not.
Would you like to learn more about shrink film to inform your buying decision? Then you will want to check out our learning center. There, you can find tons of useful information about shrink film. This information will help you to purchase the right film for your needs.
About Nathan Dube
As the Digital Marketing Specialist at Industrial Packaging, I am honored to create content for such a phenomenal company and work with one of the greatest teams in the Packaging Industry. Whether creating a video, writing blog posts or generating other pieces of content and multimedia, I am always excited to help educate and inspire our prospects and clients to reach their highest potential in regards to their packaging processes and needs.