Cross-Laminated Drawstring for Plastic Can Liners

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Solution Overview

Problem

Conventional plastic can liners with drawstrings lack sufficient strength and sealing properties, particularly in terms of tensile and tear strength, which can lead to easy tearing and inadequate closure mechanisms.

Innovation Solution

A cross-laminated plastic film drawstring is used, comprising multiple layers with different orientations to enhance tensile strength, elasticity, and sealing properties, featuring a ridged texture and slanted seal lines for improved grip and closure efficiency.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Strength

If a conventional drawstring is used in a plastic can liner, then the closure mechanism is simple and easy to manufacture, but the tensile strength and tear strength are insufficient leading to easy tearing

Engineering Contradiction:

Improvetensile strength and tear strengthVSAvoiddrawstring structure complexity

Core Design Contradiction:

StrengthVSDevice complexity

Solution Approach 1:

The drawstring is constructed from cross-laminated plastic film comprising multiple layers (at least two layers) laminated together with major directions of orientation at an angle to each other. This composite structure combines materials with different properties to achieve both high tensile strength and tear resistance while maintaining flexibility for closure functionality.

Inventive Principle:

Principle #40Composite materials

Solution Approach 2:

The invention changes the physical and structural parameters of the drawstring by using cross-laminated film with specific orientation angles between layers, creating a material with enhanced mechanical properties including improved tensile strength, tear strength, and elasticity compared to conventional single-layer drawstrings.

Inventive Principle:

Principle #35Parameter changes

2Reliability

If a cross-laminated plastic film drawstring is used to enhance strength and sealing properties, then tensile strength and tear strength are improved, but the manufacturing process becomes more complex

Engineering Contradiction:

Improvesealing properties and closure efficiencyVSAvoidmanufacturing process simplicity

Core Design Contradiction:

ReliabilityVSEase of manufacture

Solution Approach 1:

The cross-laminated plastic film is manufactured and prepared in advance with the desired multi-layer structure and orientation angles before being formed into the final drawstring product. This preliminary preparation of the laminate material simplifies the subsequent drawstring manufacturing process while ensuring the reliability and sealing properties are already built into the material structure.

Inventive Principle:

Principle #10Preliminary action

3Duration of action of moving object

If multiple layers with different orientations are laminated together to enhance tensile strength, then the drawstring becomes more durable and elastic, but the manufacturing precision requirements increase

Engineering Contradiction:

Improvedrawstring durability and elasticityVSAvoidlayer orientation and lamination precision

Core Design Contradiction:

Duration of action of moving objectVSManufacturing precision

Solution Approach 1:

The invention optimizes the lamination parameters by specifying that multiple layers are laminated with their major directions of orientation at an angle to each other (without requiring exact 90-degree perpendicularity). This parameter specification provides sufficient precision for enhanced durability and elasticity while avoiding excessively tight manufacturing tolerances that would make production impractical.

Inventive Principle:

Principle #35Parameter changes

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 cross-laminated drawstring provides strong, elastic, and durable closure with enhanced tensile and tear strength, ensuring effective sealing and easy mounting/removal from containers while maintaining good mechanical properties.

Implementation Method 1

the drawstring is a cross-laminated plastic film

Methodology Applied

Scientific EffectLamination: Lamination

Data Source

PatentUS9555932B2Plastic liner bag with drawstring

Publication Date: 2017.01.31 INTEPLAST GROUP CORPORATION

AI summary

A plastic can liner and a drawstring for closing the can liner. First and second plastic panels joined along edges of the panels define a bag body. Opposed first and second panel edges that are not joined define a can liner opening. A first hem extends along the first panel edge and a second hem extends along the second panel edge. A drawstring extends through the first and second hems. The drawstring is a cross-laminated plastic film. In some embodiments, the drawstring includes first and second drawstring strips sealed together adjacent the opposite ends thereof. Each of the first and second drawstring strips can be made from a plastic film including a first layer and a second layer bonded to the first layer. Each of the first and second layers have a machine direction oriented transverse to the length of the drawstring and the machine direction of the other layer.