Lubricants and Mold-Release Agents

Štěpek, J.; Daoust, H.

doi:10.1007/978-1-4419-8481-4_3

Cited by 3 publications

(1 citation statement)

References 2 publications

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“…The modification of the mold surface in order to decrease the adhesion between the mold and the molded plastic component is one approach to reduce the ejection force. An established method is to apply release agents such as waxes, soaps, or silicones onto the mold in order to reduce the sticking of adherent polymers, hence reducing the ejection force and removing the injected part without any damage [8,9]. However, the release agents are non-permanent and only effective for eight to ten injection molding cycles [9].…”

Section: Introductionmentioning

confidence: 99%

Reduction of Ejection Forces in Injection Molding by Applying Mechanically Post-Treated CrN and CrAlN PVD Films

Tillmann

Stangier

Dias

et al. 2019

JMMP

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In injection molding, the reduction of ejection forces is a process relevant aspect to improve the production rates. For this purpose, CrN and CrAlN films were sputtered on cylindrical and quadratic AISI H11 cores of an injection mold in order to investigate their influence on the resulting ejection forces to demold polypropylene test components. Within this context, the ejection forces of the PVD coated cores were compared to those of uncoated cores made of AISI H11. For both the cylindrical and quadratic cores, the as-deposited CrN and CrAlN films exhibit higher ejection forces than the uncoated cores due to the increase of the roughness profile after sputtering. It is known that the ejection forces are directly related to the surface roughness. In order to ensure comparable surface conditions to the uncoated surfaces, and to demonstrate the potential of PVD coated mold surfaces when reducing the ejection forces, the coated surfaces were mechanically post-treated to obtain a similar roughness profile as the uncoated cores. The combination of a PVD deposition and post-treatment ensures a significant reduction of the ejection forces by 22.6% and 23.7% for both core geometries.

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Section: Introductionmentioning

confidence: 99%

Reduction of Ejection Forces in Injection Molding by Applying Mechanically Post-Treated CrN and CrAlN PVD Films

Tillmann

Stangier

Dias

et al. 2019

JMMP

View full text Add to dashboard Cite

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Release Agents

Owen¹

2000

Kirk-Othmer Encyclopedia of Chemical Technology

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Owen, Michael J. (Dow Corning Corp.). Release agents are used to minimize adhesion between surfaces in many industrial processing and handling operations such as extrusion, molding, transferring, and packaging. They function either by lessening intermolecular interactions between surfaces or by preventing close contact. Consequently, they are either low surface‐tension materials such as fatty acid derivatives, natural and synthetic waxes, and polymers such as polytetrafluoroethylene and polydimethylsiloxane, or particulate solids such as silica or mica. The principal classes of materials used are waxes, fatty acid metal soaps, other long‐chain alkyl derivatives, polymers, and fluorinated compounds. These are formulated into products of various forms, including solvent solutions, emulsions, and films. They are widely used in the metal, glass, rubber, plastics, furniture, and food industries. Some key material transfer processes critically dependent on release agent technology include hot stamping foils, pressure‐sensitive adhesives, photocopying, transfer coatings, and transfer printing of textiles. Growth is modest, but new products are evolving. The trend is from solvent to waterbourne systems, and from single‐application products to semipermanent types. Vol. 21, pp. 207–218, 31 refs. to June 1994.

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