Gas-Tight Coated Paper Sack Overlap Venting
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing paper sacks fail to provide sufficient product protection and stability for sensitive filling materials, as the barrier layer is loosely overlapping, allowing moisture and gases to diffuse into the material, leading to faster aging or destruction.
Innovation Solution
A paper sack with a gas-tight coated paper layer having an overlap that is adhesively bonded internally, featuring perforations for air escape during filling, preventing external gas and moisture penetration, and using a multi-layer structure with metalized films for enhanced protection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a barrier layer is interposed between inner and outer paper layers, then product protection is improved, but the structure complexity increases and manufacturing difficulty arises
Solution Approach 1:
The patent merges the barrier layer function with the inner paper layer by applying a gas-tight coating directly onto the inner paper layer. This integration eliminates the need for a separate loose barrier layer while maintaining product protection, thereby reducing structure complexity and manufacturing difficulty.
Solution Approach 2:
The patent uses a composite structure where a gas-tight coating (such as metalized film or plastic coating) is applied onto the inner paper layer. This composite material approach provides both the mechanical properties of paper and the gas-tight barrier properties, achieving product protection without adding complex separate layers.
2Stability of the object's composition
If a further paper layer is arranged within the barrier layer, then structural stability is improved, but residual moisture diffusion into filling material increases
Solution Approach 1:
The patent replaces additional paper layers with a gas-tight coating applied on the inner paper layer. This coating acts as an effective barrier to moisture diffusion while the underlying paper layer provides structural stability, thus avoiding the harmful effect of moisture diffusion from multiple paper layers.
Solution Approach 2:
The patent uses a thin gas-tight coating film on the inner paper layer to prevent moisture diffusion. This thin film approach provides effective barrier protection without the bulk and moisture content of additional paper layers, thereby preventing harmful moisture diffusion while maintaining necessary structural integrity.
3Reliability
If the overlap of the coated paper layer is adhesively bonded toward the sack interior, then leaktightness is improved, but air escape during filling is hindered
Solution Approach 1:
The patent applies adhesive bonding only in specific local areas of the overlap region rather than across the entire overlap. This localized bonding approach maintains leaktightness at the bonded areas while leaving other areas open for air escape during filling, thus resolving the contradiction between leaktightness and air escape.
Solution Approach 2:
The patent incorporates a porous layer in the overlap region that allows air to pass through while maintaining the adhesive bond. This porous structure enables air escape during filling while the adhesive provides sufficient leaktightness for the filled sack, thus resolving the contradiction between these two requirements.
4Reliability
If the overlap extends from base to upper part, then product protection is improved, but manufacturing complexity increases
Solution Approach 1:
The patent combines the overlap function with the existing paper layer structure by applying the gas-tight coating continuously across the overlap region. This integration allows the overlap to extend from base to upper part for comprehensive protection while using the same manufacturing process for the coated layer, thereby reducing manufacturing complexity.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Ensures effective venting during filling while maintaining product stability and protection by preventing atmospheric gases and moisture from damaging the filling material, extending storage life and preventing spillage.
Implementation Method 1
a coated paper layer (20) having a coating facing the sack interior which forms a good seal against gas passage, in particular against the passage of atmospheric oxygen, CO2 or gaseous water
Implementation Method 2
the layer of the inner layer facing the sack interior is adhesively bonded to the layer of the coated paper layer facing the sack exterior in the region of the overlap
Implementation Method 3
the layer of the coated paper layer facing the sack interior has perforations in the region of the overlap which are covered by the layer of the overlap facing the sack exterior. Air can escape through these perforations
Data Source
AI summary
The present invention relates to a paper sack for bulk material such as cement, gypsum, granulate, animal feed or similar, having a base, preferably a cross bottom or block bottom, and having an upper part which is disposed opposite the base and in which a valve hose is optionally arranged for filling the paper sack, wherein the paper sack has a coated paper layer, having a gas-tight coating facing the sack interior, wherein the coating forms the surface of the inner wall of the paper sack contacting the filling material, and wherein the coated paper layer has an overlap which is sealingly adhesively bonded toward the sack interior, and wherein the layer of the coated paper layer facing the sack interior has perforations in the region of the overlap which are covered by the layer of the coated paper layer facing the sack exterior.