Easy-Open Synthetic Resin Bag With Adhesion Width Difference
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Solution Overview
Problem
Existing synthetic resin bags with easy peel tapes face challenges in easily opening the bag while maintaining airtightness and preventing fluid exudation, as the adhesive strength required for easy peeling is insufficient against internal pressure, limiting content weight and filling rate, and making it difficult to peel off the tape from the opening section.
Innovation Solution
The bag features two easy peel tapes with weak adhesion layers facing each other and strong thermally adhesive layers adhered to the inner faces of the panel films, with adhesion width differences to facilitate easy opening by opposing forces and prevent separation under internal pressure, ensuring easy peeling on the opening side without compromising closure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the adhesive intensity of the easy peel tape is set at 0.6 through 1.5 kg/15 mm to enable easy peeling on the opening section side, then the peeling operation becomes easy, but the adhesive strength is insufficient against pressure from the bag interior section, limiting the kind, weight, and filling rate of contents
Solution Approach 1:
The easy peel tape is divided into two distinct adhesive layers: a first adhesive layer with strong adhesion (2.0-4.0 kg/15 mm) for bonding to the bag body, and a second adhesive layer with weak adhesion (0.6-1.5 kg/15 mm) for easy peeling. This segmentation allows each layer to perform its specific function optimally without compromise
Solution Approach 2:
Different regions of the tape structure are assigned different adhesive properties: the first adhesive layer positioned against the bag body provides strong local adhesion to prevent peeling under internal pressure, while the second adhesive layer positioned on the opening section side provides weak local adhesion for easy manual peeling
2Reliability
If the adhesive intensity of the easy peel tape is set at 2.0 through 4.0 kg/15 mm or more to prevent peeling on the interior section, then the closure reliability is improved, but the peeling on the opening section side of the bag body becomes difficult
Solution Approach 1:
The tape is segmented into multiple adhesive layers with different strengths, allowing the strong first adhesive layer to ensure closure reliability while the weak second adhesive layer maintains peeling ease, resolving the contradiction between these two requirements
Solution Approach 2:
The easy peel tape uses a composite structure combining different adhesive materials with contrasting adhesion strengths, creating a multi-functional tape that simultaneously provides strong anchoring and easy release capabilities
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
Enables easy opening of the bag with minimal force while maintaining a tight seal, preventing fluid exudation and ensuring the bag remains closed under internal pressure, even with heavy or high-filling contents, and simplifies the manufacturing process.
Implementation Method 1
said thermally adhesive layers of said two easy peel tapes being strongly adhered to the inner faces of said panel films of said bag body
Data Source
AI summary
There is provided a synthetic resin bag having an easy-opening function in which an opening operation can be easily made on a side of an opening section of a bag body while it is prevented on a side of an interior section of the bag body and comprising two front and back panel films 1a and 1b of the bag body and two easy peel tapes 4a and 4b each including an easy peel layer and a thermally adhesive layer and disposed inside of the panel films of the bag body in an opening section 2 thereof over the whole lateral widths thereof, the easy peel layers of the two easy peel tapes faced to each other being weakly adhered to each other as indicated by a reference numeral 6 and the thermally adhesive layers of the two easy peel tapes being strongly adhered as indicated by reference numerals 5a and 5b to the inner faces of the panel films 1a and 1b of the bag body, respectively, so that the thermally adhesive layers have adhesion width difference of long and short widths C1 and C2 in a direction perpendicular to the lateral width of the bag body whereby the easy peel tapes can be easily separated on the side of the opening section 2 of the bag body while the easy peel tapes can be prevented from being separated on the side of the interior section of the bag body.