Packing Box Perforated Lines for Film Opening
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Solution Overview
Problem
Existing packing boxes for photosensitive recording materials, such as X-ray film, face issues with excessive paper powder generation and uneven opening forces due to zipper or perforated line designs, leading to defects and operational challenges.
Innovation Solution
A packing box with a rectangular cross-section and a lid portion featuring two perforated lines arranged at an angle, forming a trapezoidal opening strip, which can be easily broken with one hand, reducing paper powder generation and requiring minimal force, and is constructed from corrugated board with strategically positioned cut and non-cut portions for enhanced strength and safety.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a lateral zipper is used to form an opening port, then the opening port can be opened, but a large amount of paper powder is generated which attaches to the light-shielding moisture proof bag and is carried into the imager tray
Solution Approach 1:
The opening port is formed by breaking two perforated lines that divide the front panel into segments, allowing the opening strip to be separated cleanly without generating excessive paper powder. The perforated lines create controlled break points that minimize dust generation compared to tearing a long zipper.
Solution Approach 2:
The opening strip is extracted as a separate functional element formed by the two perforated lines, allowing it to be broken away cleanly to form the opening port. This extraction method reduces paper powder generation compared to the lateral zipper approach.
2Ease of operation
If perforated lines are used to form an opening port, then the opening port can be opened, but if the length of portions to be broken is too short the compression strength is lowered and if too long a large opening force is required
Solution Approach 1:
The optimal length of the perforated line portions to be broken is determined as 50-75% of the entire width of the output port. This parameter optimization balances the compression strength requirement with the opening force requirement, allowing easy one-handed opening while maintaining box strength.
Solution Approach 2:
Instead of using the full width of the output port for the perforated lines, only 50-75% of the width is used. This partial action approach reduces the opening force required while maintaining sufficient compression strength for the box structure.
3Strength
If the distance between perforated lines is large in a wide box, then the box structure is maintained, but it may not be opened successfully unless opened in parallel with the perforated lines using both hands
Solution Approach 1:
The two perforated lines are arranged asymmetrically at angles of 60-90 degrees relative to the upper side of the front panel, converging toward the bottom portion of the box body. This asymmetric arrangement creates a triangular opening strip that can be easily broken with one hand while maintaining box structure.
Solution Approach 2:
The perforated lines are arranged in a triangular configuration rather than parallel lines, creating a converging pattern that reduces the effective opening distance. This dimensional arrangement allows one-handed operation even in wide boxes while maintaining structural integrity.
4Ease of operation
If the perforated lines are arranged at angles of 60-90 degrees, then the opening strip can be broken easily with one hand, but the complexity of the perforated line configuration increases
Solution Approach 1:
The perforated lines have different properties in different sections: cut portions with main lines and introduction lines for easy breaking, and non-cut portions for maintaining strength. This local differentiation allows one-handed opening while managing configuration complexity through functional zoning.
Data Source
Figure 1
Figure 2(a)
Figure 2(b)
AI summary
A packing box comprising a box body for storing a photosensitive recording material and a lid portion having an insertion flap, wherein two perforated lines including cut portions and non-cut portions arranged alternately are formed from two points at a distance of 50 to 75% of an entire width of the output port toward a bottom portion of the box body so as to approach toward each other at the same angle between 60° and 90° with respect to an upper side of a front panel on the side of the output port of the front panel of the box body to which the insertion flap comes adjacent when the lid portion is closed, wherein an area surrounded by the two perforated lines and lines connecting between upper ends and between lower ends of the respective perforated lines constitutes a substantially trapezoidal opening strip for forming an opening port for facilitating the photosensitive recording material to be taken out from the output port when the respective perforated lines are broken, wherein the cut portions of the perforated line each include a main line extending in a breaking direction and an introduction line formed so as to open at a starting side of the respective cut portions outward from the breaking direction, and wherein the respective cut portions are arranged such that when an imaginary line vertical to the upper side of the front panel is drawn from a terminal of the main line to the cut portion located immediately below, the imaginary line passes through a center area of the introduction line out of three equally divided parts of the cut portion immediately below.