Flexible Pouch Manufacturing Using Hot Thermoplastic Coating
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Solution Overview
Problem
Current flexible pouches for medical and food use, made from thermoplastic materials, face issues such as plasticizer migration, time-consuming manufacturing processes, and product losses due to sharp edges, which pose health and efficiency concerns.
Innovation Solution
A process involving preparing hot flexible thermoplastic material in a pasty state, coating an annularly arranged insert with it, locking blow mold shells, and expanding the sheath internally or externally with pressurized gas to form a flexible pouch without edges or the need for plasticizers, using materials like polyurethane or PVC.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If high-frequency or hot welding is used to manufacture flexible pouches from thermoplastic films, then the pouches can contain liquids effectively, but the manufacturing process becomes time-consuming and generates product losses due to cutting and sharp edges
Solution Approach 1:
The invention changes the manufacturing approach from welding films to molding thermoplastic material directly in a pasty state. The material is coated on the insert while hot and pliable, then molded into the final pouch shape without requiring cutting or welding operations, eliminating sharp edges and reducing manufacturing steps
Solution Approach 2:
The insert is pre-formed and coated with hot thermoplastic material before molding. This preliminary coating action allows the material to be shaped around the insert in one continuous process, avoiding subsequent cutting and welding operations that would otherwise be required to assemble the pouch
2Ease of operation
If thermoplastic materials containing plasticizers are used to make flexible pouches, then the material achieves necessary flexibility, but plasticizers may migrate into the liquid causing health problems
Solution Approach 1:
The invention uses composite or alternative thermoplastic materials that achieve the required flexibility without relying on plasticizers. The material formulation is designed to provide inherent flexibility through its molecular structure or composition, eliminating the need for additives that could migrate into liquids
Solution Approach 2:
The invention removes plasticizers from the material composition entirely. By selecting thermoplastic materials that achieve flexibility through their base composition rather than additives, the harmful plasticizer migration issue is eliminated while maintaining the necessary material properties
3Reliability
If multiple manufacturing steps including calendering, cutting, and welding are used to produce flexible pouches, then the pouches meet functional requirements, but the process generates troublesome structures such as sharp edges and product losses
Solution Approach 1:
The invention combines multiple manufacturing operations into a single molding process. The coating of hot thermoplastic material on the insert and the formation of the final pouch shape occur simultaneously in one continuous operation, eliminating separate cutting and welding steps that generate waste and sharp edges
Solution Approach 2:
The invention changes the material state and processing method from cold film handling to hot material molding. By working with thermoplastic material in a hot, pliable state that can be directly molded, the process eliminates cutting operations and the resulting sharp edges, producing a seamless pouch structure
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 method results in a more economical, edge-free flexible pouch production that eliminates the need for additives, reduces production time, and minimizes material loss, while ensuring asepsis and safety for medical applications.
Implementation Method 1
coating all or part of said insert of hot flexible thermoplastic material in the pasty state
Implementation Method 2
injecting a pressurized gas inside said enclosure so as to expand the sheath from the inside on the internal surface of said mould
Implementation Method 3
locking the imprinted shells of the blow mold around said insert
Data Source
Figure 1~1B
Figure 2~2C
Figure 3~3D
AI summary
The invention relates to a method for producing a flexible pouch (1) made of flexible thermoplastic material. Said method is characterized in that it comprises the steps of : (i) preparing said hot flexible thermoplastic material in a pasty state, (ii) placing a so-called "proximal" pre-molded insert (2) onto a mounting (4) such that said insert is arranged in a ring around said mounting, (iii) coating all or part of said insert with hot flexible thermoplastic material in the pasty state, (iv) locking the blow-mold shells around said insert, and (v) injecting a pressurized gas into said chamber so as to expand the sleeve from inside onto the inner surface of said mold or expand the sleeve from the outside by creating negative pressure inside said chamber.