Pinhole Assessment | Plastic Testing Other Properties - Smithers
Smithers can locate pinholes in flexible films using a range of vacuum, gas detection, optical, porosity and dye penetration techniques to corresponding standards. Pinholes in packaging films may result from the material conversion process or subsequent manual handling and transit of the primary packaging.
When polymer layers cover the pinhole, one can compute the amount of moisture and oxygen coming through the pinhole, knowing the area of the foil pinhole and the transmission properties of the layers covering the pinhole. In the case of a PET film and LDPE extrusion laminate, Fick’s law would govern this transmission as barriers for
A robust algorithm for detecting pinholes in transparent plastic films ...
1993年8月1日 · Pinholes appear as white blobs with a very dark boundary in the microscopic images of transparent plastic films. The microscopic image is first mapped into three different colors. The boundary pixels of each white blob in a binarized image are then extracted.
How to Beat the Odds: Avoid Packaging Pinholes
2022年2月12日 · Packaging engineers are familiar with this common packaging failure: the dreaded pinhole. Having been through it myself as a medical device packaging engineer—and helping customers design and analyze their packaging as the Technical Director at Oliver Healthcare Packaging—I’ve learned how to reduce or avoid pinholes altogether.
A robust algorithm for detecting pinholes in transparent plastic films ...
1993年8月1日 · A computer vision based technique which automatically detects pinholes in microscopic images of transparent plastic films and also provides accurate and consistent information about the size, number and location of pinholes is presented. Pinholes appear as white blobs with a very dark boundary in the microscopic images of transparent plastic films.
Influence of artificial pinholes in aluminium foils and plastic films on water vapour and oxygen permeation was determined in this study. Results show clear correlation between the size and number of pinholes and gas permeation. Water vapour and oxygen permeation increase significantly when there are pinholes through the structure.
Leak detection of micro pinholes | LeakTEC - Tantec
This fully automatic test is capable of detecting pin holes even smaller than 3 microns by introducing an electrical potential between a detecting electrode and an electrical ground, (i.e. metal jig or mandrel holding the part) while the plastic part itself acts as the insulator.
Pinhole Effect and Formation of Microplastics on PVC, PP and PET ...
2024年7月19日 · The pinhole effect, the creation of openings in the polymer film, depends on the frequency of pulsed electrical microdischarges at the same location, heat intensity, pressure at a specific point, and exposure time to DCSBD plasma.
Plastics — Film and sheeting — Guidance on the testing of ... - ISO
This International Standard has been prepared to provide guidance in the testing of plastic films for producers and users. Although there are existing standards that provide this guidance for a number of film products, these are quite specific in respect to the materials covered and do not address many commercial films that are produced as ...
Flex Resistance | Plastic Testing Physical Properties - Smithers
The flex resistance or flex durability of a plastic film is a measure of its toughness, specifically its resistance to pinholing when subjected to flexing abuse. A cylinder of the film is repeatedly flexed under specified conditions using a Gelbo flex tester and the sample inspected for pinholes after a set number of full or partial flex cycles.