A Sewn Open Mouth (“SOM”) multi-wall paper bag is a common industrial packaging style designed to package a wide variety of dry flowable products. The SOM bag is an open mouth bag that is closed using sewing thread.
Open mouth bags are packed on equipment that deposits material into the bag via hopper or vertical filling spout. The bottom of the bag is pre-closed by the bag manufacturer. Once the bag is filled, the flush cut open end of the bag is sewn closed by the user. SOM bags can be equipped with an easy-open pull tape feature to quickly open the bag and discharge its contents.
SOM bags were one of the earliest multi-wall bag constructions available in the market. Today they remain a tough, economical, workhorse bag style for a broad range of applications. Bags can be packed on manual or fully automated equipment.
To package basic free-flowing products such as animal feed, rice, seed, and fertilizer, a gross weight open mouth bagger under a control hopper would be considered. An operator places an empty bag on a conveyor that transitions to the filling mechanism. The bag's mouth is presented manually or automatically on the fill spout and filled until it achieves the desired weight. The filled unclosed bag then transfers to a sewing head where it can be manually or automatically fed through the sewing head. Once the bag is closed it will transition to the pallet for shipping.
Used with larger size material that won’t leak out between stitches. Options include 1 thread (generally with portables) or 2 threads (fixed heads, high speed applications).
Reduces major leaking.
Allows quick opening of sewn bags.
|Traditional Kraft Paper||High Performance Extensible Paper|
|Manufactured from short wood fiber||Manufactured from long wood fiber|
|Heavy, coarse sheet||Smooth sheet|
|Strength through high basis weight||Strength through superior stretch and flexibility|
|Limited stretch||6-7% stretch|
|Low levels of porosity||High levels of porosity|
|Limited energy absorption||Superior energy absorption|
|Ideal for 3-4 ply bag construction||Ideal for 2 ply bag construction|
Need a custom size, style, and print? We offer fully customized SOM bag options for your business. Our range of bag styles include:
Minimum order quantities and artwork charges may apply. Lead times vary between 4 and 16 weeks depending on bag style.
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