Pre-applied Adhesive Deposits for Carton Flap Bonding
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Solution Overview
Problem
Current hot melt adhesive application systems for carton assembly are inefficient due to energy consumption, labor requirements, high maintenance, and inaccuracies in adhesive placement, leading to waste and increased costs.
Innovation Solution
A method of assembling cartons using pre-configured blanks with pre-applied adhesive deposits on major flaps, activated by an energy source such as lasers or heat, allowing for precise alignment and bonding, reducing adhesive quantity and improving stacking stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If hot melt adhesive is applied at high speed (100-250 feet per minute), then productivity is improved, but manufacturing precision deteriorates due to large margin of error in adhesive placement
Solution Approach 1:
The adhesive is pre-applied to the carton flaps before the carton enters the high-speed assembly line. This preliminary action allows the adhesive to be applied with high precision when the carton is stationary or moving slowly, eliminating the placement errors that occur when attempting to apply adhesive at high speeds. The pre-applied adhesive then simply needs to be activated and bonded during the high-speed assembly process.
2Manufacturing precision
If a larger quantity of hot melt adhesive is used to compensate for placement errors, then manufacturing precision is improved, but loss of substance increases due to adhesive waste
Solution Approach 1:
By pre-applying the adhesive to the flaps before assembly, the system can use precise adhesive application methods that minimize waste. The adhesive is applied only where needed on the flap surfaces, rather than attempting to apply it accurately during high-speed assembly. This eliminates the need to use excessive adhesive to compensate for placement errors.
3Strength
If hot melt adhesive is heated to appropriate temperature, then strength of adhesive bond is improved, but use of energy increases due to heating large quantity of adhesive
Solution Approach 1:
The system extracts or removes the heating function from the main adhesive application system. Instead of heating large quantities of adhesive in a central reservoir, the adhesive is pre-applied in a cool or ambient state, and then only the specific adhesive areas on the flaps are heated locally during assembly. This dramatically reduces the total energy required for heating.
Solution Approach 2:
The system changes the temperature parameter of the adhesive from a continuously heated state to a locally and temporarily heated state. The adhesive is applied at ambient temperature and then rapidly heated only at the bonding locations using energy sources such as lasers, infrared heaters, or radio frequency heating, rather than maintaining the entire adhesive supply at high temperature.
4Productivity
If hot melt adhesive is applied to moving cartons, then productivity is improved, but manufacturing precision deteriorates due to carton orientation deviations
Solution Approach 1:
The adhesive application step is performed as a preliminary action before the carton enters the high-speed moving assembly line. The cartons are processed through the adhesive application station at a slower pace or are stationary, allowing for precise adhesive placement. Once the adhesive is applied, the cartons then proceed through the rest of the assembly process at high speed, where only the activation and bonding steps are required.
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 enhances precision in adhesive placement, reduces adhesive waste, lowers energy consumption, and improves the stability and ease of assembly of cartons, while minimizing maintenance and labor costs.
Implementation Method 1
activating the adhesive deposits on the first and, if present, on the second major flaps using an energy source
Implementation Method 2
the adhesive deposits are in alignment and at least partially in contact with each other to permit the pre-applied adhesive deposits to adhesively bond
Data Source
AI summary
A carton having a pair of end flaps for closing an end of the carton is disclosed. The end flaps each have at least one pre-applied adhesive deposit. When the end flaps of the carton are in their closed postions, the pre-applied adhesive deposit on one of the end flaps is generally in alignment and at least partially in contact with the pre-applied adhesive deposit on the other of the end flaps to permit the pre-applied adhesive deposits to adhesively bond.