Ultrasonic-Welded PET Tote Bags for Small-Batch Graphic Printing
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Solution Overview
Problem
Current methods for manufacturing tote bags from nonwoven polypropylene (PP) fabric struggle to produce high-quality promotional information and accommodate small batch production while maintaining a high production rate and low cost, especially when incorporating recycled materials.
Innovation Solution
The use of nonwoven polyethylene terephthalate (PET) fabric with ultrasonic bag welding and dye sublimation printing allows for high-quality promotional images on tote bags, enabling small batch production and inclusion of recycled materials, along with the integration of biaxially oriented polypropylene (BOPP) film lamination and ultrasonic welding for handle attachment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If nonwoven polypropylene (PP) fabric is used for tote bag manufacturing, then production cost is reduced, but the ability to produce high-quality promotional information and accommodate small batch production is limited
Solution Approach 1:
The patent changes the material parameter from polypropylene to polyethylene terephthalate (PET) nonwoven fabric, which has a higher melting point and better printing properties. This parameter change enables both high-quality promotional information production and small batch manufacturing while maintaining cost-effectiveness through ultrasonic welding compatibility.
Solution Approach 2:
The patent employs composite material construction by laminating BOPP film to nonwoven PET fabric. This composite structure combines the printing capabilities of BOPP film with the structural integrity and ultrasonic welding compatibility of PET fabric, resolving the contradiction between promotional quality and manufacturing ease.
2Productivity
If traditional stitching or sewing methods are used for handle attachment and seam sealing, then manufacturing simplicity is maintained, but production rate increases and cost decreases when using ultrasonic welding
Solution Approach 1:
The patent replaces the mechanical stitching system with an ultrasonic welding system. This substitution eliminates the need for needles, threads, and complex stitching mechanisms, thereby increasing production rate and reducing operational complexity despite requiring ultrasonic welding equipment.
Solution Approach 2:
The patent utilizes the phase transition of PET fabric from solid to molten state during ultrasonic welding. The sonotrodes reach the melting point of nonwoven PET fabric, creating a molten phase that bonds seams and handles through ultrasonic vibration, enabling rapid welding without mechanical stitching.
3Productivity
If ultrasonic welding is used for handle attachment and seam sealing, then production rate increases and cost decreases, but the fabric must withstand higher temperatures
Solution Approach 1:
The patent changes the fabric material parameter from polypropylene to polyethylene terephthalate (PET), which has a higher melting point suitable for ultrasonic welding temperatures. This parameter change enables the use of ultrasonic welding while preventing fabric degradation.
4Adaptability or versatility
If small batch production is implemented for promotional tote bags, then customization capability is improved, but production efficiency may decrease
Solution Approach 1:
The patent applies preliminary action by pre-printing promotional information on BOPP film before lamination to the PET fabric. This preliminary printing step enables quick customization for small batches without requiring time-consuming setup changes during production, thereby maintaining both customization capability and production efficiency.
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 approach enables the production of tote bags with high-quality promotional information in small batches at a high rate and low cost, incorporating recycled materials, by leveraging the higher melting point and printing capabilities of PET fabric and the efficiency of ultrasonic welding.
Implementation Method 1
an ultrasonic bag welding device that ultrasonically welds seams and handles of tote bags using sonotrodes capable of reaching the melting point of nonwoven PET fabric
Implementation Method 2
Promotional information is printed directly on nonwoven PET fabric tote bags using dye sublimation
Implementation Method 3
a method for manufacturing tote bags includes laminating biaxially oriented polypropylene (BOPP) film to nonwoven polypropylene (PP) or PET fabric
Data Source
AI summary
In one method, a piece of nonwoven PET or PP fabric is formed into a tote bag using a bag forming device. Seams of the tote bag are ultrasonically welded using an ultrasonic bag welding device. The ultrasonic bag welding device includes at least one sonotrode. In another method, BOPP film is received and a full-color graphic is printed on the BOPP film for each tote bag using a printer. The printed BOPP film is received from the printer and nonwoven PP or PET fabric is received from a roll of nonwoven PP or PET fabric using a laminator. The printed BOPP film is laminated to the nonwoven PP or PET fabric. The printed BOPP film laminated to nonwoven PP or PET fabric is received from the laminator and a finished version of each tote bag is produced using an ultrasonic bag welding device.