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Structural Design and Standing Mechanism of Stand-Up Food Pouches
Release Date:
2026-03-17
Summary
In the field of flexible food packaging, stand-up pouches are a type of packaging that can stand upright on their own without external support. Their unique bottom design gives them distinct advantages in terms of shelf display and ease of use.
I. Bottom-up Structure: The Core of Self-Reliance
The key to a stand-up pouch’s ability to stand lies in the folding and sealing method of the bottom film:
Bottom support structure: The bottom of the pouch features a folded edge, where a layer of film is folded inward to form a support surface. After filling with food, the bottom unfolds outward under the weight of the contents, creating a stable, upright base
Bottom Sealing Method: The bottom of a stand-up pouch is typically heat-sealed, with the sealing area forming an elliptical or rectangular contour. This ensures both a secure seal and provides the necessary support area for the pouch to stand upright.
Folding Direction: The direction of the bottom fold runs parallel to the front of the pouch. When opened, the width of the bottom surface exceeds the thickness of the pouch, keeping the center of gravity within the support area.
II. Overall Structure: A combination of three-side sealing and a stand-up bottom
Stand-up pouches incorporate the sealing features of three-side-sealed bags into their overall structure, with the addition of a bottom-forming design:
Main Sealing: The left, right, and top edges of the pouch are heat-sealed to form a sealed container structure.
Bottom Forming: The bottom hem is formed during the manufacturing process; the precision of this fold affects the pouch’s stability when standing upright.
Top Opening: The top remains open prior to filling and is sealed after filling. Some stand-up pouches feature a resealable zipper or a tear-open tab at the top.
Dimensions and Proportions: The ratio of the bag’s height to its base width is engineered to ensure the bag maintains an upright posture when fully loaded.
III. Bag Manufacturing Process: From Film Rolls to Stand-Up Pouches
The production of stand-up pouches requires the installation of a bottom forming device on standard bag-making equipment. The main processes are as follows:
Unwinding and Folding: After the laminated film roll is unwound, it passes through the bottom forming plate to create a folded edge, forming the bottom gusset structure
Bottom Sealing and Forming: The folded edges are heat-sealed to secure the bottom support structure and simultaneously seal the bottom.
Side and Top Sealing: The left and right sides, as well as the top, are heat-sealed according to preset dimensions to form the main body of the bag.
Cutting and Collection: The continuous film strip is cut into individual stand-up pouches, which are then inspected for appearance before being packaged and stored.
IV. Factors Affecting Standing Stability
The stability of stand-up pouches is influenced by various factors and must be controlled during both the design and production phases:
Base width: The width of the base when unfolded should be in a reasonable proportion to the thickness of the pouch. A base that is too narrow is prone to tipping over, while one that is too wide compromises aesthetics and packaging density.
Base seal strength: The base seal area must have sufficient heat-seal strength to prevent delamination or cracking under load.
Film stiffness: The rigidity of the outer layer affects the bag’s vertical support; insufficient stiffness may cause the upper part of the bag to tilt.
Content Distribution: The distribution of food within the bag after filling also affects the center of gravity. Powdered or granular foods typically stand upright better than block-shaped or strip-shaped foods.
The bottom structure design of stand-up pouches is the key feature that distinguishes them from ordinary three-side sealed bags. Through the combination of bottom gussets and sealing processes, flexible packaging gains the ability to stand on its own, offering convenience for food display and use.
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