Oral Active Substance Laminate Coating via Roller Gap Control
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Solution Overview
Problem
Existing methods for producing oral active substance laminates struggle with achieving a consistent weight per unit area of active substance-containing layers, particularly in multi-layer systems, due to fluctuations in substrate thickness and weight, which affects the overall laminate's uniformity and active ingredient distribution.
Innovation Solution
A method involving a substrate with a top and bottom, where an active substance-containing composition is applied in a gap formed by rotating rollers, allowing for controlled application and drying to achieve a consistent thickness and weight per unit area, independent of the substrate's basis weight or thickness fluctuations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If standard roll coating method is used to apply active ingredient-containing mass directly to substrate, then the coating process is simple and direct, but the basis weight of the active ingredient layer fluctuates due to substrate thickness variations
Solution Approach 1:
A doctor blade is introduced as an intermediary element between the active ingredient-containing mass and the substrate. The doctor blade controls the thickness of the applied layer by maintaining a precise gap, ensuring consistent basis weight regardless of substrate variations. This mediator decouples the coating thickness from substrate thickness fluctuations.
Solution Approach 2:
The gap distance between the doctor blade and substrate is controlled as a critical parameter to regulate the basis weight of the active ingredient layer. By precisely adjusting and maintaining this gap parameter, the invention achieves consistent coating thickness and basis weight independent of substrate variations.
2Productivity
If direct coating of active ingredient mass onto substrate is performed, then the manufacturing process is short and efficient, but the active ingredient layer thickness is not sufficiently constant
Solution Approach 1:
The doctor blade serves as a mechanical intermediary that precisely controls the active ingredient layer thickness. It creates a defined gap that acts as a template for uniform coating, ensuring constant layer thickness while maintaining continuous production flow.
Solution Approach 2:
The active ingredient-containing mass is pre-applied to a carrier film before being transferred to the substrate. This preliminary coating step on a stable carrier surface ensures uniform thickness is achieved first, then the pre-coated carrier with active ingredient layer is transferred to the substrate, decoupling thickness control from substrate variations.
3Device complexity
If the active ingredient layer is applied directly to the substrate without a carrier film, then the process steps are minimized, but the basis weight cannot be determined separately from the substrate
Solution Approach 1:
The coating process is segmented into two independent stages: (1) coating the active ingredient layer onto a carrier film where basis weight can be precisely controlled and measured, and (2) transferring the pre-coated carrier film to the substrate. This segmentation allows separate determination and control of active ingredient layer basis weight independent of substrate weight.
Solution Approach 2:
A carrier film is introduced as an intermediary substrate that provides a stable, measurable base for applying and determining the active ingredient layer basis weight. The carrier film acts as a temporary carrier that enables precise basis weight control and measurement before final transfer to the product substrate.
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 ensures a uniform and precise application of the active substance layer, resulting in a consistent and reliable active substance content in the oral active substance laminate, enhancing its efficacy and stability.
Implementation Method 1
Applying an active ingredient-containing mass into a gap formed by a first rotating roller and a second rotating roller
Implementation Method 2
The active ingredient-containing mass is applied from the second roller to the top surface of the substrate
Implementation Method 3
Drying the intermediate laminate, in particular the active ingredient layer, wherein the intermediate laminate is exposed to a temperature of 30°C - 120°C in the drying device
Data Source
AI summary
The invention relates to a method for producing an active substance laminate, in particular an oral active substance laminate (100) having at least one active-substance-containing layer (31), which is arranged on a substrate (20), wherein the method comprises the following steps: a) providing a substrate having an upper side (21) and an underside (22); b) applying an active-substance-containing mass (24) in a gap (25) formed by a first rotating roller (26) and a second rotating roller (27); c) transporting the substrate (20) to the second roller (27) by means of a third rotating roller (28) in such a way that the active-substance-containing mass (24) is applied to the upper side (21) of the substrate (20) by the second roller (27) in the form of an active-substance-containing layer (31); d) transporting an intermediate laminate (30), formed by the substrate (20) and the active-substance-containing layer (31), to a drying device (40); and e) drying the intermediate laminate (30), in particular the active-substance-containing layer (31).