Paper Shipping Sacks Today
| Assembly lines can be custom-formatted for specific construction, filling and closure needs.
Following World War II, the multiwall paper shipping sack
industry continued its development toward becoming a packaging leader.
Sacks had been extensively transformed from their origins in
the 1920s when sack makers supplied hand-tied sacks to Portland cement
This evolution has allowed the kraft paper sack to take
shape using an unlimited array of constructions, such as carefully
selected papers, films, foils, special coatings, laminations and
surface and other treatments. The construction materials specified in
each case are determined by the product itself and the degree of
product protection required to safeguard its quality.
Thousands of people are directly involved in the production
of paper shipping sacks in America, with many in addition who work in sales, accounting, customer service and other
supporting or related functions.
From a modest beginning, the paper shipping sack and consumer bag industry has
emerged into a billion dollar a year industry with shipments of over
three billion sacks annually. Today, paper shipping sacks are used to package a wide variety of food, agricultural building material and industrial purpose products.
Advantages Paper Shipping Sacks
Paper shipping sacks are flexible containers made from
one or more walls of specification papers and other materials. They
are custom-designed to meet the exact requirements of individual
shippers and provide the highest degree of product quality protection
at the lowest cost that meets normal handling, shipping and service
|| Multiwall sacks are frequently used as master containers (balers) for consumer bags.
Current specifications for sack papers, constructions and
various types of closures have been developed by scientific evaluation
of the performance of paper shipping sacks over a long period of
time. This continuous, long-term research has led to evolutionary
improvements in materials and closures over the period.
The package engineer is virtually unlimited in the
choice of constructions available in paper shipping sacks. Walls of
the sack and treatments used can be precisely specified to provide
types and degrees of product protection required for whatever the
distribution system and handling characteristics dictate. Sack designs
and constructions can be adapted to existing or new filling and
Paper shipping sacks offer excellent printing surfaces.
Today's sack manufacturing plants are equipped to print product
graphics on the outer ply of a sack with the clarity and detail that
approach magazine and other fine paper printing technologies.
- Basic raw material is a renewable resource
- Protects contents from the absorption of moisture
- Prevents loss of essential moisture from contents
- Permits top-icing of fresh produce
- Prevents the escape of oils or flavors from products
- Protects against chemical action of contents
- Prevents seepage or penetration of products packed “hot”
- Provides a gas or vapor barrier for volatile products
- Prevents sifting of finely ground products
- Provides low-cost protection against contamination
- Permits stacking for better utilization of warehouse space
- Serves as a degradable package under certain conditions
- Has the FDA approval for food packaging
- Provides excellent graphics for improved “buy appeal”
- Permits free-standing use as a point-of-purchase display
Sizes and General Types
Paper shipping sacks are made in many sizes as specified by
the shipper, consistent with the suppliers’ manufacturing
capabilities and product requirements. Multiwall sack capacities
usually range from 20 pounds to 110 pounds of product. Self-opening style sacks holding less than 20 pounds of contents are referred to as consumer bags. Sack
constructions usually are of two general types and designated
according to the filling method to be used:
- Open mouth: filling is done by gravity or compression
- Valve: filling is done through a filling tube or spout
Valve sacks are usually fabricated entirely in the sack
plant, except for a corner opening to allow filling at the customer's
packing plant. Open mouth sacks are fabricated in the sack plant
except for the top which is closed in a variety of ways at the packing
Originally used for packing low-cost,
bulk-type commodities, paper shipping sacks are now used for the
delivery of thousands of different types of products. In value, these products
typically range from a few cents to several dollars per pound. As improvements
in materials, constructions and distribution systems continue to
develop, more products with a greater value-per-pound are being
packaged in shipping sacks.
The paper shipping sack industry is one of growth,
innovation and service to its customers. Significant advancements in
sack packaging are continuously being made to better serve current
customers and develop new package uses for the versatile multiwall paper sack.