Paper Roll Packaging with Slit Sheath and Single End Gable
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing methods for packaging paper and board rolls result in costly solutions due to increased material consumption and mechanical complexity, with issues of damage to 'ears' formed during handling and potential moisture ingress.
Innovation Solution
A packaging method where the end gable circular blank constitutes the only end gable, using a sheath paper web with thermoplastic resin coverage and strategically placed slits to prevent loose flaps and enhance moisture barrier properties, reducing material and equipment costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an outer end gable circular blank is applied outside the folded-down edge and heat sealed against it, then moisture barrier protection is improved, but material consumption and device complexity increase
Solution Approach 1:
The invention extracts and eliminates the outer end gable circular blank from the packaging system, relying instead on the single inner end gable circular blank combined with the folded-down sheath paper web to provide moisture barrier protection. This removes the complex heat sealing operation between outer and inner blanks while maintaining protection.
Solution Approach 2:
The sheath paper web's folded-down edge serves its own protective function by forming the moisture barrier against the single end gable circular blank, eliminating the need for an additional outer blank. The system uses its own components rather than requiring external additions.
2Reliability
If an outer end gable circular blank is applied outside the folded-down edge and heat sealed against it, then moisture barrier protection is improved, but material consumption increases
Solution Approach 1:
The invention removes the outer end gable circular blank from the material list, reducing material consumption while maintaining moisture barrier functionality through the folded-down sheath paper web and single inner blank configuration.
Solution Approach 2:
The invention discards the outer end gable circular blank as unnecessary material, recovering cost savings while the folded-down edge continues to provide the required protective function.
3Reliability
If the sheath paper web is wound multiple turns about the roll, then packaging coverage is improved, but slit alignment issues arise when slits are not properly spaced
Solution Approach 1:
The invention changes the critical parameter from slit positioning accuracy to slit spacing, allowing multiple turns of the sheath paper web while preventing alignment issues by ensuring slits of adjacent turns do not overlap, thereby maintaining packaging integrity.
4Ease of manufacture
If the end gable circular blank uses only paper fibre material, then manufacturing simplicity is maintained, but friction and stability during handling are reduced
Solution Approach 1:
The invention applies a thermoplastic resin coating to the paper fibre material carrier, creating a composite material that combines the manufacturing simplicity of paper with the enhanced friction and stability properties of thermoplastic resin during roll handling and piling.
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
This method achieves improved protection and reduced costs by minimizing material usage and mechanical complexity, while ensuring a stable and moisture-resistant packaging solution.
Implementation Method 1
a sheath paper web with thermoplastic resin coverage and heat sealing the folded-down side edge portions against the end gable circular blanks
Implementation Method 2
The thermoplastic resin preferably covers the entire side of the papery carrier, such that the sheath paper web will consist of a laminate of the carrier and the thermoplastic resin. Thereby, the sheath paper web will become waterproof
Data Source
Figure 1~1A
Figure 2~3A
Figure 4
AI summary
A method for packaging of paper and board rolls (1), comprising a sheath paper web (2) consisting of a papery carrier (20) with side edge portions (22) that have least one portion thereof covered by a thermoplastic resin (21) that becomes adhesive when heated, said method comprises the winding of said sheath paper web (2) at least one turn about the envelope surface (10) of the roll (1) with the thermoplastic resin (21) facing the envelope surface (10) and the papery carrier (20) facing away from the envelope surface (10), such that a side edge portion (22) of the sheath paper web (2) projects externally of each end gable (11; 12) of the roll (1), the bringing of end gable circular blanks sized (d) to fit the diameter (D) of the roll (1) to lie against the end gables (11, 12) of the roll (1), and the folding of the projecting side edge portion (22) down against the end gable (11; 12) of the roll, providing the projecting side edge portion (22) to be folded down against the end gable (11; 12) of the roll with a series of lateral slits (23) that between themselves form a series of tongues (24, 24'), and heat sealing the folded-down side edge portions (22) against the end gable circular blank (3; 4) positioned between the end gable (11; 12) of the roll and the side edge portion (22), wherein the end gable circular blank (11; 12) constitutes the only end gable circular blank at each end in question of the final packed board or paper roll (1).