Blank Supply Apparatus Roller Cutting for Round Edge Box Forming
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Solution Overview
Problem
The production of package boxes with round edges requires precise formation of folding lines, which is challenging due to variations in geometry and material properties, leading to defects such as swelling, adhesive detachment, and separation issues, resulting in increased production costs and quality variations.
Innovation Solution
A blank supply apparatus with a transfer path and rollers that form cut lines in the blank to reduce bending strength, allowing for controlled folding geometries and improved productivity and quality, featuring a cutting roller with blades to create cut lines in the strip regions corresponding to the edges of the box.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a platen is used to emboss folding lines on the blank, then folding lines can be formed, but production costs increase due to the need for multiple platens for different geometries and subtle adjustments of pressing pressure are necessary
Solution Approach 1:
The patent replaces the conventional platen with a segmented roller structure having multiple pressing sections along its circumference. Each pressing section can independently press different regions of the blank, allowing a single roller to perform the function of multiple platens with different geometries. This segmentation eliminates the need for multiple separate platens and reduces device complexity while maintaining folding line formation precision.
Solution Approach 2:
The patent enables dynamic adjustment of pressing parameters (pressure, position, duration) for each pressing section on the roller. This allows the system to adapt to different folding line geometries and material properties without requiring physical replacement of platens. The parameter changes are controlled based on the position and type of folding lines needed, reducing both device complexity and production costs.
2Manufacturing precision
If pressing force of the platen is not appropriate or not uniform, then folding lines can be formed, but quality variations occur such as too shallow or too deep folding lines
Solution Approach 1:
The patent incorporates feedback mechanisms that monitor the pressing force and folding line formation process in real-time. Based on this feedback, the system automatically adjusts the pressing parameters for each section to maintain consistent folding line depth and quality. This closed-loop control ensures uniform folding lines across different blanks and positions, eliminating quality variations caused by inappropriate or non-uniform pressing force.
3Ease of manufacture
If folding lines are formed too shallow, then the blank can be folded, but round edges are hard to form and boxes may swell resulting in adhesive detachment
Solution Approach 1:
The patent applies different pressing forces and durations to different regions of the blank based on their specific requirements. For regions requiring round edge formation, the pressing parameters are optimized to create sufficiently deep and precise folding lines that can withstand the forming process without swelling. This local quality approach ensures that each region receives the appropriate pressing treatment, maintaining both foldability and geometric precision.
4Manufacturing precision
If folding lines are formed too deep, then the blank can be folded, but the platen will bite into the material web excessively and adjacent sections may be separated
Solution Approach 1:
The patent employs dynamic control of the pressing process, where the pressing force and duration are automatically adjusted based on the real-time state of the blank and the specific folding line requirements. This prevents excessive pressing that would bite into the material web and cause separation, while still achieving sufficient folding line depth. The dynamic adjustment ensures that pressing parameters are optimized for each specific case, maintaining blank integrity while achieving the required folding line quality.
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 solution effectively controls folding geometries, reduces defects, and enhances the quality and productivity of package boxes by minimizing the bending strength of the blank, ensuring proper bonding and formability, thus improving the overall package quality.
Implementation Method 1
a pair of rollers rotatably placed on opposite sides of the transfer surface and provided with a pressing region on an outer circumferential surface to feed the blank while pressing a strip region of the blank
Implementation Method 2
one of the pair of rollers has a large number of blades in the pressing region, and when the blank passes between the pair of rollers, the blades form a large number of cut lines in the strip region of the blank to reduce bending strength
Data Source
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AI summary
The invention is related to a blank supply apparatus (8) adapted to supply blank (10) used to form a box (14) of a package (1) to a packaging machine (12), the supply apparatus (8) comprising: a transfer path (26) adapted to transfer the blank (10) piece by piece along a transfer surface (40) by extending from a supply source (4) of the blank (10) to the packaging machine (12); a pair of rollers (30) rotatably placed on opposite sides of the transfer surface (40) and provided with a pressing region (46) on an outer circumferential surface (42c, 44c) to feed the blank (10) while pressing a strip region (24) of the blank (10) corresponding to a square edge (16) of the box (14); and a preliminary folding station (38) placed at a preliminary folding position established downstream of the pair of rollers (30) and adapted to preliminarily fold the strip region (24) of the blank (10) and give a preliminary folding angle to the strip region (24) when the blank (10) is placed at the preliminary folding position, wherein the preliminary folding station (38) includes: a preliminary folding guide (60) placed on the transfer path (26) and provided with a lateral edge (68) extending along the transfer path (26), where when the blank (10) is placed at the preliminary folding position the blank (10) is superimposed under the preliminary folding guide (60) and a flap section (22) of the blank (10) protrudes from the lateral edge (68), the flap section (22) being provided with the strip region (24); and a folding element (64A, 64B) placed in a neighborhood of the lateral edge (68) of the preliminary folding guide (60) and provided with an axis extending along the lateral edge (68), wherein the folding element (64A, 64B) folds the flap section (22) by pressing the strip region (24) along the lateral edge (68) and thereby establishes the preliminary folding angle of the flap section (22) with respect to the blank (10), the flap section (22) includes an inside flap (22a) located inside the box (14) during forming of the box (14) and an outside flap (22b) located outside the box (14) during the forming of the box (14), the folding element (64A, 64B) includes a first folding member (67a) adapted to fold the inside flap (22a) and a second folding member (67b) adapted to fold the outside flap (22b), and the first and second folding members (67a, 67b) give different preliminary folding angles to the inside and outside flaps (22a, 22b).