Elastic Member Attachment in Absorbent Article Manufacturing
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Solution Overview
Problem
The existing manufacturing method for underpants-type absorbent articles results in increased material costs due to the cutting and removal of bands and sheet webs, which are not used in the finished product, and requires additional equipment for forming and affixing bands, leading to higher production costs.
Innovation Solution
A method that forms and attaches elastic members around the leg holes without cutting and removing bands and sheet webs, allowing for continuous production and reducing material waste and equipment costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If bands and sheet webs are cut and removed continuously along the edges of the sheet webs, then elastic members can be provided discontinuously around the leg holes, but material costs increase due to waste of bands and sheet webs
Solution Approach 1:
The elastic member is attached to the absorbent article before the cutting step. By preliminarily attaching the elastic member to the sheet web, the patent enables the elastic member to be positioned correctly before the sheet web is cut to remove excess material. This preliminary attachment allows the elastic member to be preserved in the final product while the excess sheet web is removed, resolving the contradiction between achieving discontinuous elastic members and minimizing material waste
Solution Approach 2:
The patent segments the elastic member attachment process from the cutting process. Instead of cutting first and then attaching, the elastic member is attached to specific portions of the sheet web that will become the final product edges. This segmentation allows the elastic member to be selectively positioned only where needed, reducing material waste while achieving the desired discontinuous configuration around the leg holes
2Ease of manufacture
If a device for forming and affixing bands is installed, then elastic members can be attached to sheet webs, but production equipment costs increase
Solution Approach 1:
The patent merges the elastic member attachment process with the existing sheet web handling and cutting process. By integrating the attachment step into the continuous production line that already handles sheet webs, the patent avoids the need for completely separate band forming and affixing equipment. The elastic member can be attached using modified existing machinery or simpler attachment mechanisms that utilize the already-present sheet web transport and positioning infrastructure
Solution Approach 2:
The patent extracts the essential function of elastic member attachment from complex band forming equipment. Instead of using elaborate devices to form and affix traditional bands, the patent attaches elastic members directly to the sheet web in a simplified manner. This extraction of the core attachment function eliminates the need for complex band forming mechanisms while still achieving the desired elastic member attachment
Data Source
AI summary
A manufacturing method of an underpants-type absorbent article comprises each of the steps of transporting a continuous body of a sheet that forms a front piece or a back piece in the form of a sheet web in a machine direction, supplying a continuous elastic body to the sheet web while oscillating in a cross-machine direction, alternately positioning the continuous elastic body on the sheet web and outside the sheet web, attaching those portions of the continuous elastic body positioned on the sheet web to the sheet web, holding those portions of the continuous elastic body positioned outside the sheet web with a holder, and cutting and removing those portions of the continuous elastic body positioned outside the sheet web.