FFS Bag Seam Strength via Localized Adhesive Application
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Solution Overview
Problem
Existing methods for producing form, fill, and seal (FFS) sacks face challenges in achieving significant material savings without compromising the strength of the bags, as previous approaches either require excessive material or result in insufficient bonding during the welding process.
Innovation Solution
The method involves adding a second material component to the flat web material only in specific areas, particularly at the seams, using techniques like applying extrudate or adhesive to enhance seam durability without affecting the entire surface, thereby optimizing material usage and seam strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If adhesive layers are applied to entire surfaces to improve bonding strength, then seam strength is improved, but material consumption increases significantly
Solution Approach 1:
The patent applies adhesive only in specific local areas where seams are formed (transverse and longitudinal seams) rather than coating the entire surface. This localized adhesive application maintains bonding strength at critical junctions while dramatically reducing overall adhesive consumption and material cost.
Solution Approach 2:
The adhesive application is segmented into discrete locations corresponding to seam positions. The flat web material receives adhesive at specific segments (seam areas) rather than continuous coverage, optimizing the balance between bonding requirements and material efficiency.
2Quantity of substance
If fabric material is used to reduce material consumption, then material savings are achieved, but strength is lost during welding processes
Solution Approach 1:
The patent employs a composite structure combining flat web material with strategically placed adhesive layers. This composite approach allows the use of lighter materials while maintaining overall seam strength through the adhesive reinforcement at critical locations.
Solution Approach 2:
Strength reinforcement is applied locally at seam positions using adhesive rather than uniformly across the entire fabric surface. This allows fabric material to be used for the bag body while adhesive provides concentrated strength at joining points.
3Duration of action of stationary object
If coating is applied over entire surface to retain fabric strength during welding, then seam durability is improved, but material consumption increases
Solution Approach 1:
The coating or adhesive is applied only where durability is critical - at the seam locations - rather than covering the entire surface. This localized treatment ensures seam durability while minimizing coating material consumption.
Solution Approach 2:
Instead of applying coating excessively over the entire surface, the patent uses partial action by applying adhesive only to the extent necessary for seam formation, achieving sufficient durability without excessive material use.
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
This approach allows for significant material savings while maintaining or improving the strength of the bags by targeting material addition specifically to areas that require reinforcement, such as transverse and longitudinal seams, thereby enhancing the durability of the seams without unnecessary material usage.
Implementation Method 1
A transverse seam is usually created by welding, whereby heat and contact pressure are applied to the bag material from the outside using welding jaws
Implementation Method 2
at least one second material component in the form of an adhesive layer is applied to the flat web material
Implementation Method 3
adding at least one further material component to the flat web material from which the tube is formed before the bags are formed
Data Source
Figure 1
Figure 2
Figure 3~5
AI summary
The invention relates to a method for producing, filling, and closing bags (27), wherein a tube material (4) is formed from a flat web material comprising a first material component (43), wherein tube pieces (18) are formed by transversely severing tube material (4), said tube pieces having a longitudinal axis, wherein the tube pieces (18) are provided with a bottom seam by means of a first transverse joining process, and thus bags (27) are produced, wherein the bags are filled through the remaining opening of the bags, and wherein the remaining opening of the bags (27) are provided with a top seam (64) by means of a second transverse joining process. At least one second material component (45, 48) is added to the flat web material before the bags are formed, and the combination of the at least two components (43; 45, 48) of the flat web material is varied in the direction of the tube axis in such a way that the qualities of the tube material formed from the flat web material change in the direction of the tube axis, at least in portions of the tube width (B).