Reclosable Flap Container Structure for Precise Sealing
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Solution Overview
Problem
Existing cigarette containers face challenges in achieving a balanced adhesive strength for the reclosable flap, leading to issues such as damage to the lid, poor repositioning of the cover flap, attachment failures, and contamination from tobacco crumbs, while also suffering from preservation problems and difficulties in opening the container without distorting embossed indicia.
Innovation Solution
A container design with a reclosable flap that maintains tension through specific distance ratios and hinge line positioning, allowing for precise repositioning and effective sealing, while minimizing slack and risk of damage, and incorporating a planar indicium to prevent distortion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If adhesive strength is increased to ensure reliable sealing, then sealing reliability is improved, but the lid and hinge are damaged during first opening
Solution Approach 1:
The adhesive is applied selectively only in the overlap region between the reclosable flap and the inner package, rather than across the entire flap surface. This localized adhesive application provides sufficient bonding strength for sealing while minimizing the overall adhesive mass that could cause damage during opening operations.
Solution Approach 2:
The adhesive extends beyond the overlap region to the free end of the reclosable flap, creating a longer adhesive strip than strictly necessary for sealing. This partial extension ensures adequate bonding area for reliable sealing while the adhesive is positioned to not interfere with lid opening mechanics.
2Ease of operation
If adhesive strength is decreased to allow easy opening, then ease of opening is improved, but the cover flap repositioning becomes imprecise and attachment fails
Solution Approach 1:
The adhesive is concentrated in the overlap region where precise repositioning is critical, providing strong local bonding that ensures accurate flap alignment and attachment during repositioning operations.
Solution Approach 2:
The reclosable flap is pre-positioned and temporarily held by the adhesive during the opening operation, allowing the user to remove cigarettes and then reposition the flap accurately. The adhesive provides a temporary anchoring point that facilitates precise repositioning before final sealing.
3Device complexity
If adhesive area is reduced to simplify the system, then device complexity is reduced, but attachment reliability deteriorates
Solution Approach 1:
The adhesive is applied only in the overlap region between the reclosable flap and inner package, creating a focused, localized bonding area. This simplifies the adhesive application process and reduces material usage while maintaining sufficient attachment reliability for the flap to remain securely positioned during normal use.
4Reliability
If the reclosable flap is made longer to improve sealing coverage, then sealing effectiveness is improved, but slack increases and positioning precision decreases
Solution Approach 1:
The length of the reclosable flap is optimized to extend just beyond the inner package boundary by a controlled amount (5-20mm). This parameter optimization ensures sufficient sealing coverage while preventing excessive slack that would compromise positioning precision during opening and closing operations.
Data Source
Figure 1
Figure 2~3A
Figure 3B
AI summary
The invention refers to a container for consumer goods, comprising: an outer housing (1) comprising a box (2) and a hinged lid (3) rotatable between open and closed positions, wherein the hinged lid comprises a first lid panel (32) and a second lid panel (31), wherein the first lid panel is movable relative to the second lid panel during movement of the hinged lid between the open and closed positions; an inner package (5) of consumer goods within the box comprising an access opening (6) through which consumer goods can be removed and that is provided at least at a portion of top and front walls of the inner package; and a reclosable flap (8) arranged to cover the access opening and attached to the first lid panel; wherein a ratio between a length of the first lid panel to a distance between a top, front edge of the inner package and a top, front edge of the box is at least 0.3.