Influences of micro-ridges orientation and position on the replication of micro-structured surfaces by injection molding

Francesco Regi*, Alberto Basso, Martin Kain, Dario Loaldi, Dongya Li, Yang Zhang, Guido Tosello

*Corresponding author for this work

Research output: Contribution to journalConference articleResearchpeer-review

Abstract

In this work, directional optical properties were achieved with a microstructure composed of a close array of ridges, defined by their width and by the angle with respect to the main surface. Under constrained lighting, the reflectance was maximized from a certain viewing angle and direction, and minimized from its horizontally orthogonal position. The purpose was generating quick response codes (i.e. Data matrix) that could be easily scanned by means of commercially available software. The ridges were 1.2 mm long, 0.2 mm wide and with a 10° slope angle, for a depth of about 0.03 mm. Each code was defined by 10x10 modules, each composed of 6 ridges. The code was machined on a tool insert and replicated by means of Injection Moulding. This study investigated the effect of the ridge orientation with respect to flow front and the effect of the distance from the gate The inserts have then been replicated using Acrylonitrile butadiene styrene (ABS). Inserts and replicates were characterized using a Olympus Lext OLS4100 Laser Confocal microscope. Values of height, slope and roughness of the milled ridges and their replicates have been measured. The results showed that ridges parallel to the flow on the replicates had better replication accuracy and that, contrary to the expectations, ridges closer to the gate were replicated worse than the micro-structures far from the gate.
Original languageEnglish
Article number020013
JournalAIP Conference Proceedings
Volume2205
Issue number1
Number of pages5
ISSN0094-243X
DOIs
Publication statusPublished - 2020
Event35th International Conference of the Polymer Processing Society (PPS-35) - Çeşm-Izmir , Turkey
Duration: 26 May 201930 May 2019

Conference

Conference35th International Conference of the Polymer Processing Society (PPS-35)
CountryTurkey
CityÇeşm-Izmir
Period26/05/201930/05/2019

Keywords

  • Functional Surface
  • Micro-Structured Surface
  • Injection Molding
  • Thermoplastic

Cite this

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title = "Influences of micro-ridges orientation and position on the replication of micro-structured surfaces by injection molding",
abstract = "In this work, directional optical properties were achieved with a microstructure composed of a close array of ridges, defined by their width and by the angle with respect to the main surface. Under constrained lighting, the reflectance was maximized from a certain viewing angle and direction, and minimized from its horizontally orthogonal position. The purpose was generating quick response codes (i.e. Data matrix) that could be easily scanned by means of commercially available software. The ridges were 1.2 mm long, 0.2 mm wide and with a 10° slope angle, for a depth of about 0.03 mm. Each code was defined by 10x10 modules, each composed of 6 ridges. The code was machined on a tool insert and replicated by means of Injection Moulding. This study investigated the effect of the ridge orientation with respect to flow front and the effect of the distance from the gate The inserts have then been replicated using Acrylonitrile butadiene styrene (ABS). Inserts and replicates were characterized using a Olympus Lext OLS4100 Laser Confocal microscope. Values of height, slope and roughness of the milled ridges and their replicates have been measured. The results showed that ridges parallel to the flow on the replicates had better replication accuracy and that, contrary to the expectations, ridges closer to the gate were replicated worse than the micro-structures far from the gate.",
keywords = "Functional Surface, Micro-Structured Surface, Injection Molding, Thermoplastic",
author = "Francesco Regi and Alberto Basso and Martin Kain and Dario Loaldi and Dongya Li and Yang Zhang and Guido Tosello",
year = "2020",
doi = "10.1063/1.5142928",
language = "English",
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journal = "A I P Conference Proceedings Series",
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publisher = "American Institute of Physics",
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TY - GEN

T1 - Influences of micro-ridges orientation and position on the replication of micro-structured surfaces by injection molding

AU - Regi, Francesco

AU - Basso, Alberto

AU - Kain, Martin

AU - Loaldi, Dario

AU - Li, Dongya

AU - Zhang, Yang

AU - Tosello, Guido

PY - 2020

Y1 - 2020

N2 - In this work, directional optical properties were achieved with a microstructure composed of a close array of ridges, defined by their width and by the angle with respect to the main surface. Under constrained lighting, the reflectance was maximized from a certain viewing angle and direction, and minimized from its horizontally orthogonal position. The purpose was generating quick response codes (i.e. Data matrix) that could be easily scanned by means of commercially available software. The ridges were 1.2 mm long, 0.2 mm wide and with a 10° slope angle, for a depth of about 0.03 mm. Each code was defined by 10x10 modules, each composed of 6 ridges. The code was machined on a tool insert and replicated by means of Injection Moulding. This study investigated the effect of the ridge orientation with respect to flow front and the effect of the distance from the gate The inserts have then been replicated using Acrylonitrile butadiene styrene (ABS). Inserts and replicates were characterized using a Olympus Lext OLS4100 Laser Confocal microscope. Values of height, slope and roughness of the milled ridges and their replicates have been measured. The results showed that ridges parallel to the flow on the replicates had better replication accuracy and that, contrary to the expectations, ridges closer to the gate were replicated worse than the micro-structures far from the gate.

AB - In this work, directional optical properties were achieved with a microstructure composed of a close array of ridges, defined by their width and by the angle with respect to the main surface. Under constrained lighting, the reflectance was maximized from a certain viewing angle and direction, and minimized from its horizontally orthogonal position. The purpose was generating quick response codes (i.e. Data matrix) that could be easily scanned by means of commercially available software. The ridges were 1.2 mm long, 0.2 mm wide and with a 10° slope angle, for a depth of about 0.03 mm. Each code was defined by 10x10 modules, each composed of 6 ridges. The code was machined on a tool insert and replicated by means of Injection Moulding. This study investigated the effect of the ridge orientation with respect to flow front and the effect of the distance from the gate The inserts have then been replicated using Acrylonitrile butadiene styrene (ABS). Inserts and replicates were characterized using a Olympus Lext OLS4100 Laser Confocal microscope. Values of height, slope and roughness of the milled ridges and their replicates have been measured. The results showed that ridges parallel to the flow on the replicates had better replication accuracy and that, contrary to the expectations, ridges closer to the gate were replicated worse than the micro-structures far from the gate.

KW - Functional Surface

KW - Micro-Structured Surface

KW - Injection Molding

KW - Thermoplastic

U2 - 10.1063/1.5142928

DO - 10.1063/1.5142928

M3 - Conference article

VL - 2205

JO - A I P Conference Proceedings Series

JF - A I P Conference Proceedings Series

SN - 0094-243X

IS - 1

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ER -