Coreless rolled paper manufacturing method
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Solution Overview
Problem
Coreless paper rolls manufactured without cores often have a hardened central section that makes it difficult to completely use up the paper, as the hardened section can be left unused and the roll may deform during shipping and use.
Innovation Solution
A method involving winding paper into a roll shape, inserting an adhesive-ejecting section into the center hole, adhering the adhesive to specific areas, and heating to harden the opposite ends while maintaining the center section's adhesive strength for easy peeling, ensuring the roll can be used to its last edge without deformation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the leading wound section of the paper is hardened to form a tubular shape, then the roll shape is maintained during shipping, but the hardened section becomes difficult to peel and cannot be completely used up
Solution Approach 1:
The patent applies different adhesive properties to different sections of the roll. The leading wound section has strong adhesive force to maintain roll shape during shipping, while the trailing wound section has weak or no adhesive force to enable easy peeling and complete usage. This local differentiation resolves the contradiction between shape stability and peeling ease.
Solution Approach 2:
The patent divides the roll into functionally different sections: a leading wound section with hardened adhesive for structural integrity, and a trailing wound section with soft adhesive for usability. This segmentation allows each section to fulfill its specific function without compromising the other.
2Strength
If adhesive is applied to the leading edge of the paper to form a tubular shape, then the roll maintains its shape, but the adhesive strength becomes too strong and prevents complete usage of the roll
Solution Approach 1:
The patent varies the adhesive strength locally along the roll length. The leading edge receives strong adhesive application to ensure shape maintenance, while subsequent sections receive progressively weaker or no adhesive, allowing the paper to be peeled and used completely without leaving a hardened core.
Solution Approach 2:
The patent applies adhesive selectively only where needed (leading wound section for shape formation) rather than uniformly throughout the entire roll. This partial application ensures sufficient strength for shape maintenance while avoiding excessive adhesive that would prevent complete usage.
3Stability of the object's composition
If the center of the toilet paper roll is hardened, then the roll shape is stabilized, but the hardened section cannot be completely used up
Solution Approach 1:
The patent hardens only the leading wound section at the center of the roll to provide structural stability, while keeping the trailing sections soft and peelable. This localized hardening maintains roll shape during shipping and storage while allowing complete usage of the paper without leaving a hardened unusable core.
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 method allows for complete utilization of the paper roll without leaving a core and prevents shape loss during transportation, ensuring the roll remains usable and intact.
Implementation Method 1
a second step for inserting an insertion section, which ejects an adhesive, into a center hole of the paper roll; a third step for causing the adhesive to adhere to a predetermined position of the center hole
Implementation Method 2
a fourth step for performing a heating and drying process on an area to which the adhesive is adhered so as to harden opposite ends of the center hole
Implementation Method 3
a fourth step for performing a heating and drying process on an area to which the adhesive is adhered so as to harden opposite ends of the center hole
Data Source
Figure 1~3
Figure 4~5
AI summary
Provided is a coreless paper roll manufacturing method for manufacturing roll-shaped wound paper that can be used up to its last edge. The method includes: a first step for winding up paper (2) to form paper roll (1) having a roll shape; a second step for inserting an insertion section, which ejects an adhesive, into a center hole (3) of the paper roll (1); a third step for causing the adhesive to adhere to a predetermined position of the center hole (3); and a fourth step for performing a heating and drying process on an area to which the adhesive is adhered so as to harden opposite ends (3a, 3b) of the center hole (3). The third step includes causing the adhesive to adhere to near opposite extending ends of the center hole (3). The adhesive has adhesive strength to an extent that the paper (2) wound up into the roll shape is peelable when the paper roll (1) is to be used. The fourth step includes drying the adhesive adhered to the center hole (3) before the adhesive spreads from the predetermined position of the center hole (3).