Electrostatically Charged Plastic Sheet Packages for One-at-a-Time Dispensing

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Solution Overview

Problem

Existing plastic deli scale sheets do not dispense reliably one-at-a-time due to their lower friction coefficient and higher density, leading to issues such as sheets clinging together and requiring manual separation, especially when using conventional packaging designs.

Innovation Solution

Electrostatically charge discrete plastic sheets and design a dispensing opening structure that provides controlled resistance to facilitate reliable one-at-a-time dispensing by leveraging electrostatic forces and controlled opening dimensions.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If conventional packaging designs are used with plastic sheets, then the sheets can be stored in a stack, but the sheets do not dispense reliably one-at-a-time due to lower friction coefficient and higher density

Engineering Contradiction:

Improvedispensing reliabilityVSAvoidmanual separation requirement

Core Design Contradiction:

ReliabilityVSEase of operation

Solution Approach 1:

The patent applies parameter changes by modifying the electrostatic charge characteristics of the plastic sheets. Specifically, the sheets are given controlled electrostatic charges that create attractive forces between adjacent sheets, fundamentally changing the physical interaction parameters from purely friction-based to electrostatically-controlled, enabling reliable one-at-a-time dispensing

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent replaces the mechanical friction-based dispensing mechanism with an electrostatic field-based mechanism. Instead of relying on friction between sheets to control dispensing, the system uses electrostatic attraction forces to hold sheets in place and release them controllably, substituting mechanical interaction with electrical field interaction

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

2Reliability

If electrostatically charged discrete plastic sheets are used, then reliable one-at-a-time dispensing is achieved, but the sheets require special charging treatment

Engineering Contradiction:

Improveone-at-a-time dispensingVSAvoidcharging process complexity

Core Design Contradiction:

ReliabilityVSEase of manufacture

Solution Approach 1:

The patent applies preliminary action by charging the plastic sheets with electrostatic charge during or before the stacking process. This pre-charging ensures that the sheets are ready for reliable dispensing from the moment they are stacked, eliminating the need for additional charging steps later in the process

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent applies self-service by designing the stacking process itself to generate or distribute the electrostatic charge to the sheets. The stacking mechanism incorporates charging capabilities, allowing the sheets to charge themselves during the normal stacking operation, thereby eliminating separate charging equipment or processes

Inventive Principle:

Principle #25Self-service

3Quantity of substance

If sheets are stacked in an interfolded stack, then storage is efficient, but sheets may cling together and require manual separation

Engineering Contradiction:

Improvestack densityVSAvoidsheet separation

Core Design Contradiction:

Quantity of substanceVSEase of operation

Solution Approach 1:

The patent applies parameter changes by introducing controlled electrostatic repulsion between adjacent sheets in the interfolded stack. By carefully controlling the charge polarity and magnitude, the sheets maintain tight stacking for efficient storage while experiencing sufficient repulsive force to prevent unwanted clinging, enabling easy separation when needed

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

Ensures consistent, mess-free dispensing of plastic sheets by maintaining each sheet in a ready-to-dispense configuration, reducing contamination and waste, and enhancing user convenience.

Implementation Method 1

each of the plurality of discrete plastic sheets is electrostatically charged

Methodology Applied

Scientific EffectElectrostatic charge: Electrostatics

Data Source

PatentUS12391461B2Sheet product package and method of making dispensable sheet product

Publication Date: 2025.08.19 INTEPLAST GROUP CORPORATION

AI summary

A sheet product package and method of making discrete plastic sheets includes a package enclosure with a dispensing opening structure and a plurality of discrete plastic sheets arranged in a stack. The plurality of discrete plastic sheets are disposed within the package enclosure, and each of the plurality of discrete plastic sheets is electrostatically charged. In the method of making the dispensable plastic sheets, electrostatically charged discrete plastic sheets are formed and arranged in a stack. The method may include forming a continuous plastic film, cutting the continuous plastic film into discrete plastic sheets, and, after cutting, electrostatically charging the discrete plastic sheets.