Cold weather affects your carton sealing efforts primarily in two ways
– it affects the adhesive on the tape, and it affects the surface of the box. Bear in mind that, when shipping, your
product will be exposed not only to the environment at your location, but at the
destination and also everywhere in between (which, depending upon where it’s
going and whether it is shipping ground or air, may not be a very direct
route).
The Effect of Extreme
Cold on Carton Sealing Tape
There are three types of pressure sensitive (as opposed to
water activated) carton seal tape – acrylic, hot melt, and natural rubber. Each type has its own strengths and
weaknesses. Regardless of the type of
tape you choose, each of these must be applied in an environment where
the temperature is at least above freezing (32 degrees Fahrenheit, and 35 degrees or higher for hot melt tape). Application in a temperature below these limits will not guarantee a good seal and could lead to problems as your package
transits to its destination.
Once the tape has been applied, the different tapes have
different temperature tolerances. Acrylic
and natural rubber tapes are rated to hold their adhesion in temperatures as low as
-30 degrees Fahrenheit. Hot melt
tape can hold its adhesion down to -40 degrees Fahrenheit.
Almost anything has the potential to freeze, and the
adhesive on your carton seal tape is no exception. While it is very tolerant of the cold, none
are immune to the effects of extreme cold.
Make sure you prepare accordingly when sealing your boxes and don’t
forget to factor in both the destination of your shipment and the route it will
likely follow. Also keep in mind that
the primary mode of transportation for ground parcel shipping and all
LTL/freight shipping is in trailers (transiting via truck or rail) which are not climate controlled. Even packages shipped via air will be in
non-climate controlled environments for potentially extended periods of time.
The Effect of Extreme
Cold on Boxes
Factoring in the variables noted above regarding carton
seal tape, it’s also important to note how extreme cold can affect your
boxes. The biggest problem with extreme
cold and boxes would be moisture. This
can happen before or after the tape is applied,
particularly as the box makes its transit and passes from non-climate
controlled environments to those that are climate controlled. Such cases can produce moisture on the
box either as frost or snow melts, or simply in the form of condensation resulting from temperature
changes.
To accommodate for this, it’s important, once again, to look
at the type of tape being used. All of the
standard pressure sensitive carton seal tapes – acrylic, hot melt, and natural
rubber – have good resistance to moisture.
But of these, the tape with the greatest moisture resistance is natural
rubber. It also has the best adhesion to
boxes with dusty or rough surfaces or those made of recycled materials.
The moisture and/or condensation that can affect the outside
of your box can also affect the product inside.
In this case, it’s important to look at protecting the product itself,
as well as the box in which it ships.
The best protection would typically be to enclose the product in a poly bag. This will protect it from most
moisture issues, including those where the box is exposed to snow or ice which
later changes to water and could penetrate the box, exposing the contents to
moisture or even weakening the box to the point of risking fall-out.
Recommendation: Natural Rubber Tape
To ensure the best adhesion in any temperature or environment, natural rubber carton sealing tape is the best selection for carton seal. It is also, unfortunately, the most expensive. If you can't justify the cost of natural rubber, acrylic tape or hot melt tape carton tape will generally be sufficient, but not as reliable in extreme cold as the natural rubber. 
Natural rubber will give you the best adhesion (keeping in mind that it must be applied at temperatures of at least 32 degrees Fahrenheit) in extreme cold and also hold its adhesion down to -30 degrees Fahrenheit while still retaining its hold in spite of any reasonable humidity or moisture.
Take a look at the natural rubber tapes that are available and contact us with any questions you may have. We will be happy to assist you in ensuring your product gets where it needs to go as safely and reliably as possible.
