If you are using perforated vented stretch wrap to unitize loads that need to breather then you need to read this and see how you can get a better wrap at a fraction of the cost. It is quite surprising the number of packaging applications that require some form of breathability. Breathability is defined as allowing either airflow to flow from the product or allow airflow to reach the product. There are many types of product loads that require air gaps to allow such breathability. Here a few examples of types of instances where breathability is necessary.
Product types requiring airflow:
- Wrapping product when it is still warm; (ex: dog food, sauces, soups). allowing the heat to escape so as not to cause condensation buildup inside the wrapped load. Otherwise rust, product and /or case damage results.
- Products that need to breathe; (ex: fruits, vegetables, eggs, plants). Without these air gaps, all fruit and produce will wilt and/or spoil very quickly.
- Changing Climate during product shipment; (ex. humidity in an overseas vessel, mountain ranges) Changes in temperature and humidity during transportation will cause condensation. This can result in the same product issues as above. Shipping beer overseas is a good example where cases fall apart due to trapped condensation during shipping.
- Flash freezing products; (yogurt, fish, seafood, berries) Flash freezing requires that a large portion of the product be open to the flash-freezing blast of air. Otherwise, the freezing process is not achieved and spoilage is the result.
As you can see, there are a tremendous number of applications that require airflow. However, each one requires different amounts of airflow and different amounts of stretch film holding force. The key is getting the right amount of airflow with the right amount of stretch film applied to ensure the product gets delivered to the client in one piece, and without damage. We speak of this as the “film to air ratio”. The ratio of air gaps, so the product does not spoil, to film application so the pallet maintains it’s load integrity. is critical in allowing the product to breathe, while also holding the pallet together.
Perforated or vented stretch wrap has long been considered the only way to wrap such loads. Such stretch film has either holes punched out, or overlapped layers create a gap system of holes. If it is applied correctly it can create the air gaps required. However, there are many drawbacks to using vented films.
Perforated Vented Stretch Wrap Drawbacks:
- Perforated vented films are very expensive. In some cases 200% to 300% more than std stretch films.
- Vented films are not std items available everywhere and thus you must stock more films.
- Difficult on the wrapping equipment causing downtime. Strands of this get caught everywhere causing issues. It is difficult to cut and clamp in automatic stretch wrap equipment.
- The film to air ratio is fixed based on the number and size of the opening in the film. You can not adjust to allow more or less air and/or film. Different products require more or less airflow, or more or less holding film force to keep pallet load stable.
- Roll lengths are shorter due to the thickness of the film causing more downtime changing film rolls.
- Film to air ratio is the ratio between the amount of film coverage required to hold pallet together and the number of air gaps required to properly vent the product. This ratio is very important and is different for nearly every product. The film sitting system allows the customer to set the film gap to suit the specific product being wrapped
Phoenix Breathe Easy Film Slitting Solution:
Phoenix Wrappers is the clear leader in airflow technology. We call it BREATHE EASY technology. We have multiple film-slitting designs that are available on our least expensive semi-automatic stretch wrappers up to our fastest high-speed rotary arm stretch wrap systems. How does it differ from perforated vented stretch films? it eliminates all the drawbacks that vented stretch films have.
- Using standard stretch films means you prestretch the standard 240-300%. Most vented films max out at 200% or less.
- This technology uses standard stretch film and slits the film to create ventilation on the fly as you wrap. No expensive consumables.
- Using standard off the shelf stretch films means being able to get the best price for a stock product.
- By using standard stretch film means uptime for equipment is maximized.
- The bands can be adjusted to any width to allow more or less air to pass thru to the product, thus the film to air ratio is fully adjustable.
- Roll lengths are the standard roll lengths provided with all regular stretch films.
Maybe do this in 2 posts. one explaining the weaknesses of vented films and intro film slitting. then do a second post detailing the positives of film slitting.
- available as a bolt-on retrofit for existing wrapping machines. No replacement machine required.
- the system allows for wrapper use as std full web wrapping and also in film slitting mode. 2 systems- 1 machine.
Here are more interesting articles that may be of interest to you.
Here is a link to more information about Phoenix Wrappers Breathe East film slitting technology
You can go to our Phoenix Wrappers Youtube Channel to see our complete line of pallet stretch wrappers
Watch more videos on our Youtube channel. Phoenix Youtube
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