Asymmetrical Side Tab Application for Sanitary Articles
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Solution Overview
Problem
Existing machines for producing absorbent sanitary articles, such as diapers, face challenges in efficiently applying asymmetrical side tabs with minimal waste and ensuring secure fastening, particularly in creating trapezoidal shapes with alternating mirror-symmetrical side tab orientations.
Innovation Solution
A machine with a forming and application unit that applies side tabs to a continuous web of permeable material, using folding and adhesive means to sandwich the tabs between permeable and impermeable layers, and a conveyor system to rotate and translate the tabs into precise positions for alternating mirror-symmetrical arrangements, ensuring efficient cutting and application with minimal waste.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If side tabs are applied to the continuous strip along predetermined stretches, then the absorbent articles can be produced with side tabs, but the asymmetrical shape and trapezoidal configuration require complex positioning and folding mechanisms
Solution Approach 1:
The continuous strip is divided into multiple stretches, and side tabs are applied separately to each stretch at predetermined positions. The folding means then folds each side tab individually onto the permeable material. This segmentation allows for precise positioning of asymmetrical side tabs while simplifying the application process by handling each tab independently rather than requiring complex coordinated movement.
Solution Approach 2:
The side tabs are applied to the continuous strip before the folding operation. The forming and application unit positions and attaches the side tabs to the permeable material in advance, and then the folding means folds them into their final positions. This preliminary action simplifies the overall process by separating the positioning step from the folding step, reducing the complexity of the folding mechanism.
2Manufacturing precision
If the continuous strip is cut into individual absorbent articles, then discrete products are obtained, but the asymmetrical shape requires precise cutting alignment with the side tabs
Solution Approach 1:
The side tabs are applied to the continuous strip before cutting. By positioning the side tabs on the continuous strip in advance and securing them, the cutting means can then cut the strip into individual articles with precise alignment to the pre-positioned side tabs. This eliminates the need for complex real-time alignment during cutting, maintaining high productivity while ensuring precise asymmetrical shaping.
3Reliability
If side tabs are folded onto the permeable material, then the tabs are secured between layers, but the folding process requires precise engagement of folding means with protruding portions
Solution Approach 1:
Each side tab is folded independently onto the permeable material. The folding means engages with the protruding portion of each side tab separately, folding it onto the permeable material and securing it between the permeable and impermeable layers. This independent folding of each segment simplifies the engagement mechanism compared to folding multiple tabs simultaneously, while ensuring reliable fastening of each individual tab.
Solution Approach 2:
The protruding portion of each side tab is extracted or separated from the main body during the folding process. The folding means engages with only the protruding portion, which is then folded back onto the permeable material. This extraction of the protruding portion simplifies the folding mechanism by focusing the engagement action on a specific, isolated part of the side tab rather than the entire structure.
4Shape
If the machine produces absorbent sanitary articles with asymmetrical shapes, then the trapezoidal configuration is achieved, but material waste increases due to the complex shaping requirements
Solution Approach 1:
The continuous strip is segmented into multiple stretches with side tabs applied to specific stretches. The folding means then folds the side tabs onto the permeable material, creating the asymmetrical trapezoidal shape. By applying side tabs to predetermined stretches and folding them individually, the machine achieves the required asymmetrical shape with minimal material waste, as the folding process utilizes the existing material layout rather than requiring additional cutting or trimming.
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
The machine effectively produces absorbent sanitary articles with securely fastened, asymmetrical trapezoidal shapes and increased productivity by optimizing the application and cutting of side tabs, enhancing the efficiency and accuracy of the manufacturing process.
Implementation Method 1
adhesive means to sandwich the tabs between permeable and impermeable layers
Implementation Method 2
folding means located downstream of the unit (11) for forming and applying the pair (6) of side tabs (7) in the feed direction of the sheet of permeable material (12) engage the protruding portions (7a) of the side tabs (7) and fold them onto the sheet of permeable material (12)
Data Source
AI summary
A method for making absorbent sanitary articles whereby each absorbent article is provided with at least one pair of side tabs. The method includes the steps of feeding a single continuous web with a longitudinal axis towards at least one cutting station where the continuous web is divided, by a succession of cuts transverse to the longitudinal axis, into a first and a second series of side tabs, each of which has an asymmetrical shape and separately applying each rotated side tab of the first series and each side tab of the second series along a continuous strip of a material for making the absorbent articles, in such a way that each rotated tab of the first series is juxtaposed with a respective tab of the second series to define a respective pair of side tabs.