PVDC Coating with HDPE Particles for Friction Reduction

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Solution Overview

Problem

Polyvinylidene chloride (PVDC) coated composite films exhibit high coefficients of static and sliding friction, leading to blocking tendencies, unwanted sticking to machine parts, and poor sliding characteristics, which result in aesthetic issues and potential material destruction during thermoforming processes.

Innovation Solution

Incorporating polymer particles with specific properties into the PVDC coating, such as HDPE micronizates, to act as spacers between film wraps, reducing friction and improving sliding characteristics without altering the surface structure.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If PVDC copolymer dispersion is applied to form a sealable coating and barrier layer, then sealing and barrier properties are improved, but friction coefficients increase and sliding characteristics deteriorate

Engineering Contradiction:

Improvesealing and barrier propertiesVSAvoidsliding characteristics

Core Design Contradiction:

ReliabilityVSEase of operation

Solution Approach 1:

The patent introduces an intermediary substance (wax or lubricant additive) between the PVDC coating and other surfaces. This intermediary layer reduces direct contact and friction while maintaining the integrity of the PVDC barrier coating, thus resolving the contradiction between sealing properties and sliding characteristics

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The patent creates a composite coating system combining PVDC copolymer dispersion with wax or lubricant additives. This composite structure maintains the barrier and sealing functions of PVDC while incorporating the low-friction properties of wax or lubricants, simultaneously achieving both sealing reliability and ease of sliding operation

Inventive Principle:

Principle #40Composite materials

2Shape

If PVDC coating is applied to form a smooth surface, then appearance is improved, but blocking tendency increases and adhesion to machine parts worsens

Engineering Contradiction:

Improvesurface smoothnessVSAvoidblocking tendency

Core Design Contradiction:

ShapeVSObject-generated harmful factors

Solution Approach 1:

The patent applies local quality modification by incorporating wax or lubricant additives specifically at the surface level of the PVDC coating. This creates a dual-layer effect where the bulk PVDC maintains smoothness and barrier properties, while the surface additives provide reduced blocking and adhesion characteristics, resolving the contradiction between surface smoothness and blocking tendency

Inventive Principle:

Principle #3Local quality

3Object-affected harmful factors

If surface structure is generated to reduce air-enclosure effect, then air escape is improved, but film thickness decreases and productivity is reduced

Engineering Contradiction:

Improveair-enclosure effectVSAvoidfilm thickness and productivity

Core Design Contradiction:

Object-affected harmful factorsVSProductivity

Solution Approach 1:

The patent uses wax or lubricant additives as intermediary substances that facilitate air escape without requiring surface structuring. These additives create a compliant surface layer that allows air bubbles to escape through the coating itself rather than requiring physical surface structures, thus avoiding thickness reduction and maintaining productivity

Inventive Principle:

Principle #24Intermediary (Mediator)

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 embedding of polymer particles significantly reduces static and sliding friction, prevents material destruction, and enhances the handling and finishing of composite films in machines, while maintaining the barrier effect of the PVDC coating.

Implementation Method 1

Methodology Applied

Scientific EffectFriction reduction: Friction

Implementation Method 2

The purpose of the vinylidene chloride copolymer coating is to form a sealable coating and/or formation of a barrier layer against vapor, oxygen and aromas

Methodology Applied

Scientific EffectBarrier effect:

Implementation Method 3

The coefficients of sliding friction may be reduced after the surface of the PVDC coating has become harder due to more or less quickly on-setting and progressing crystallization

Methodology Applied

Scientific EffectCrystallization: Crystallisation

Data Source

PatentUS8986826B2Polyvinylidene chloride coating, process for producing a coating and use thereof

Publication Date: 2015.03.24 KLOECKNER PENTAPLAST

AI summary

A coating 8 made of polyvinylidene chloride contains particles 12 made of HDPE. Other particles can also be embedded in the coating, such as polymers from the group LDPE, LLDPE, PP, PVDC, PVC, polyamides, polyurethanes, polyacrylates, polystyrenes, acrylonitrile-butadiene styrene polymerizates (ABS), PTFE, hard waxes, synthetic resins, as well as mixtures and copolymerizates thereof. The coating 8 is applied to a film 9 of a composite which features a carrier film 11, to which the film 9 is laminated by means of an adhesion promoter 10 (FIG. 2).