The next time you pick up a package, give it a closer look.
The kraft box with window, with its brown, burlap-like texture and transparent
opening to reveal the contents, is not new. It's the product of more than 100
years of materials engineering, consumer behavior and packaging technology.
From its origins in a German lab, to its sustainable designs of today, kraft
boxes with windows are now one of the most widely-used packaging materials on
the planet. Here is the full history of this everyday product.
It all starts with paper. In 1879, German chemist Carl Dahl
invented a new way of making pulp for the Schaffhausen paper mill. The original
method of making paper involved using acids to dissolve wood, weakening it.
Dahl's innovation was to use sulfate, which left the fibers intact and
stronger.
Dahl called his invention kraft paper (the German word for
"strength"). This paper was rough, brown and very strong. It was
stronger and less stretchy than other papers. For the most part, at first,
kraft paper was used in industrial applications: to package heavy machinery,
line railway cars, and make sandpaper backing.
Few people in the 1880s would have thought that this new
material would be used to wrap cookies, cosmetics or house cables behind a
clear window.
In the 1890s, corrugated cardboard was invented. In 1871,
Albert Jones developed single-faced corrugated paper to wrap bottles. In 1890,
Robert Gait developed the pre-cut cardboard box that could be folded into
shape. This box could be mass-produced.
At this time, kraft paper was used as the facing for
corrugated boxes. This allowed boxes to be stacked higher. The unappealing
brown color was acceptable because boxes were concealed in transit: boxes were not
showpieces.
Windowed boxes begin to appear around this era, but were
unusual. These windows were holes punched out of the cardboard. You could see
the product - and touch it, and dirty it. This restricted them to dry and
robust products such as nails and hardware.
What was needed was clear and safe packaging. In the 1920s,
Swiss chemist Jacques Branden Berger invented cellophane, a transparent film
made of regenerated cellulose. Cellophane became readily accessible in the
1930s, and could be glued or heat-sealed to cardboard.
Now you could package a product to protect it and show it
off through a window. The first users were bakers. Pastries in the 1930s were
sold in boxes with cellophane windows, so you could see the cookies, cakes and
donuts. The concept was quickly extended to confectionery, pasta products and
even small hardware.
kraft came to be is everything you need to know about the
history of kraft
boxes with window because if the hole was not protected by clear film,
dirt, moisture, and little hands could get to the contents.
The postwar boom in consumerism. Department stores and
supermarkets replaced corner stores. Goods now needed to be sold without
personal attention. Packaging became advertising.
Cellophane had a problem: it was hygroscopic and became
brittle. Oil-based plastics such as PET (polyethylene terephthalate) and PVC
(polyvinyl chloride) replaced cellophane as the material of choice for windows
in the 1970s. They were stronger, clearer and cheaper.
Window sizes grew. The 1960s porthole window grew to a 1980s
half-panel. In the 1990s, some kraft boxes had windows that took up 75% of the
front of the box, leaving just a border for printing labels. This "see
almost everything" trend was applied to toys, electronics and craft
supplies.
A wake-up call occurred in the 2000s. Plastic waste was in
crisis. Companies were asked to remove non-recyclable elements. Plastic window
Kraft boxes were caught in the crossfire.
There were two solutions. First, compostable windows were
developed with materials such as cellulose (back to the roots of cellophane) or
PLA (corn plastic). These are compostable at industrial facilities and some
paper plants accept them.
Second, companies "designed for recycling” by using a
perforated window or a water-soluble glue that released the window from the
cardboard during the pulping process.
By 2020, we entered the now standard era: the fully
recyclable kraft box with a compostable or easily removed window. This
packaging was embraced by major brands like Patagonia, Lush and many food
co-ops.
The kraft box with window in 2026 is highly evolved. Modern
versions feature:
1.
Kraft paperboard from sustainably harvested woodlands
(FSC-certified)
2.
Compostable window films from wood pulp or other
crops
3.
Water-soluble glues used for packaging
4.
Printing inks made from soy or vegetable oils
5.
Products with 30% less material than those of
the 1990s
Future developments include windows created with bioplastics
derived from algae, and boxes that grow flowers when planted.
|
Year |
Event |
|
1879 |
Carl Dahl invents kraft paper in Germany |
|
1890 |
Robert Gair creates the first folding cardboard box |
|
1910s |
First cut-out windows appear (uncovered holes) |
|
1920s |
Cellophane invented, enabling covered windows |
|
1930s |
Bakeries adopt windowed pastry boxes |
|
1950s |
Kraft boxes become retail standard |
|
1970s |
PET and PVC replace cellophane |
|
1990s |
Large-panel windows become popular |
|
2000s |
Plastic waste concerns emerge |
|
2015 |
Compostable window films enter market |
|
2020 |
Fully recyclable kraft window boxes become standard |
|
2024–2026 |
Algae-based and plan table windows in development |
Knowing the history of kraft boxes with windows is helping
brands today. The material has always had three key attributes: protection,
visibility and price. Now, a fourth demand, sustainability, has been added.
The bad news is that it has been done before. All of the
challenges (brittle cellophane, recycling incompatibility, high material costs)
have been met with innovation. The problem of plastic waste is no exception.
The brown box with the window on your kitchen counter shows
more than 140 years of industrial innovation. The brown paper began in the lab
of a German chemist. The clear film started out as a Swiss-invented wood pulp.
The box shape came out of American innovation.
And now, you are holding the kraft box with window in your
hands: it is recyclable, compostable, and well, it displays its contents. It is
the product of human creativity, material technology and our curiosity about
what we are about to purchase.
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