Sofia Martinez
Many consumers associate glossy plastic with cheapness, especially in product photography and advertising. This is partly due to its prevalence in low-cost toys and electronics, as well as its tendency to showcase scratches, smudges, and fingerprints more easily than matte finishes. The perception of glossy plastic as inexpensive may also stem from the fact that most plastics are inherently glossy, and the process of making plastic shinier often involves higher temperatures, which can lead to discoloration and brittleness.
| Characteristics | Values |
|---|---|
| Glossy plastic | Cheap |
| Reasons | Looks good in press shots and ads; most plastics are inherently glossy; melt temperature is an important controller of gloss; extrusion process makes glossy plastic more brittle and prone to scratches; cheaper grades of materials are used |
| Issues | Prone to fingerprints, smudges, and scratches; Inconsistent gloss due to varying wall thickness and inadequate venting; dull appearance due to deflection and temperature issues |
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What You'll Learn
Glossy plastic is used for advertising purposes
Plastic is cheap because it is a by-product of gasoline production. For every gallon of gas produced, a pound of plastic is also created. This has led to plastic being used for single-use items, despite being a material that is as rare as gold.
The versatility of plastic allows for a broad range of design and fabrication options. For instance, polyvinyl chloride (PVC) can be manufactured to be rigid or flexible. In its rigid form, it is commonly used in construction materials, doors, windows, and bottles, while the softer form is used in plumbing products, electrical cable insulation, and clothing.
Additionally, acrylic, a transparent thermoplastic, is used as a lightweight, shatter-resistant alternative to glass. Acrylic sheets can be made in various colors and finishes, such as fluorescent, abrasion-resistant, bullet-resistant, UV-tolerant, non-glare, and anti-static. This makes it ideal for advertising displays that require clear, durable, and customizable materials.
Furthermore, polycarbonate plastic, which is thirty times stronger than acrylic, offers inherent design flexibility. It can be easily worked, molded, and formed on-site, making it suitable for a wide range of applications, including advertising displays that require impact resistance and design versatility.
Overall, the low cost, versatility, and durability of glossy plastic make it a popular choice for advertising purposes, enabling creative designs and unique implementations in various advertising technologies and display formats.
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It is inherently glossy
Glossy plastic is often used for advertising purposes as it looks good in press shots and photographs. However, it is usually disliked by consumers due to its propensity to attract fingerprints, smudges, and scratches.
Most plastics are inherently glossy. The non-crystalline (amorphous) polymers are also inherently transparent, but even for the semi-crystalline resins, the crystallites are typically so minuscule that they do not significantly affect the gloss. The glossiness of plastics can be altered by additives. For instance, fillers like calcium carbonate or mica, which lends a sparkly opacity, can be added. The particle size and shape of these fillers are critical factors that must be carefully selected and tested.
The extrusion process, particularly the melt temperature, plays a crucial role in determining the glossiness of plastic. Higher temperatures generally result in a glossier finish, but this must be balanced with the potential for discoloration and brittleness. Additionally, the lamination or co-extrusion of a glossy polymer layer over a tougher but less glossy core can be employed to enhance glossiness. However, this technique may also increase brittleness and scratch visibility.
The processing conditions, such as cavity water temperatures, pack/hold pressures, fill speeds, and material temperatures, can also impact the gloss level. For instance, a cooler mold, melt, and lower pack/hold pressure, along with slower fill speeds, tend to result in a glossier plastic part. This occurs because the cooler and less pressurized plastic does not conform as closely to the micro-details of the cavity steel surface finish.
Inconsistent gloss can arise from variations in wall stock thickness, inadequate venting, and converging material flow fronts. Thinner or thicker wall sections may exhibit excess gloss or glossy spots due to reduced plastic pressure or shrinkage, respectively. Inadequate venting can lead to dull or shiny spots, and converging material flow fronts can cause buildup, resulting in gloss issues.
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Gloss is controlled by melt temperature
Gloss is influenced by the flow front speed and mould temperature, which in turn affect the development rate of the melt pressure and the recovery rate of the surface stiffness. A high mould temperature is recommended when it is difficult to adjust the other moulding conditions or to revise the mould design. As the mould temperature approaches the glass transition temperature of the polymer material, the recovery of the surface stiffness is suppressed, and the polymer surface can replicate the mould surface, even at a slow development of melt pressure.
The flow front speed in the filling stage is a significant parameter for surface gloss, as much as the mould temperature. The mould temperature has the largest influence on the surface gloss. A high flow-front speed can suppress the gloss transition defect. The surface gloss sharply increases at a coolant temperature of 40 °C and flow front speeds of less than 100 mm/s. However, the surface gloss converged to approximately 90 GU at flow front speeds greater than 100 mm/s.
The surface gloss increases with distance from the flow front. A higher melt pressure suppresses the generation of a rough surface to a greater extent. A sufficiently high melt pressure maximises the mould surface replication of the polymer surface. The fluctuation of the surface gloss due to the flow front speed stabilises at high flow-front speeds.
The mould design and process conditions should be optimised to enhance the uniformity of the flow front speed and mould temperature. This will help to avoid a gloss transition defect, which is a visually recognisable transition on the surfaces of injection-moulded products.
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Glossy plastic is brittle and shows scratches
Glossy plastic is often used for advertising purposes and in product photography as it looks good in press shots and ads. However, glossy plastic has its drawbacks. Firstly, it is brittle and shows scratches easily. This is due to the extrusion process, where the melt temperature is the most crucial factor in determining glossiness. While higher temperatures yield a shinier product, they also increase the risk of discolouration and brittleness.
To mitigate this issue, some manufacturers laminate or co-extrude a glossy polymer surface over a tougher but less glossy core. However, this approach is more expensive and may not always be feasible. Another way to reduce brittleness is to add rubber to the plastic, but this will also make the product duller.
Additionally, glossy plastic is prone to smudges, fingerprints, and light reflection, which can be off-putting to some consumers. Many people prefer matte finishes, especially for handheld devices and controllers, as they are less likely to show fingerprints and smudges and may feel better in the hands over extended periods.
To address the issue of scratches and smudges on glossy plastic, some consumers opt for white devices, as scratches and fingerprints are less visible on lighter colours. Others choose to cover their devices with a matte sheet or decorate them with vinyl to hide imperfections. Ultimately, while glossy plastic may enhance the appearance of a product, it is more susceptible to scratches and brittleness, which can detract from its overall appeal.
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Glossy spots can be caused by shrinkage
Although plastic is inherently glossy, the production process can impact the level of gloss. Glossy spots can be caused by shrinkage when the wall stock is too thin or too thick. This prevents the plastic from adequately packing out, resulting in excess gloss in certain areas.
The extrusion process, which involves melting plastic, is a significant factor in determining the glossiness of plastic. Melt temperature, specifically higher temperatures, plays a crucial role in achieving a glossy finish. However, excessive heat can lead to issues such as discoloration and brittleness. To address this challenge, a glossy polymer surface can be laminated or co-extruded over a tougher but less glossy core. Nevertheless, this approach has its drawbacks, as the glossy surface is more prone to scratches and brittleness.
During processing, various factors can influence gloss, including cavity water temperatures, pack/hold pressures, fill speeds, and material temperatures. A cooler mold, cooler melt, lower pack/hold pressure, and slower fill speeds contribute to a glossier finish. This occurs because the cooler plastic exerts less pressure and does not conform as closely to the micro details of the cavity steel surface.
Additionally, the force of deflection on a plastic component can create a dull appearance. Temperature plays a role in diagnosing this issue, as the initial shots at higher temperatures should not exhibit the defect. Buildup can also cause gloss irregularities, and coatings can be applied to address this problem without compromising cavity gloss. Inadequate venting, converging material flow fronts, and the use of cheaper grades of materials are contributing factors to buildup.
While glossiness in plastic can be desirable for aesthetics and advertising purposes, it is important to consider the potential drawbacks, such as increased brittleness and scratch susceptibility, as well as the impact of processing conditions on the final product's gloss level.
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Frequently asked questions
Glossy plastic is cheap because it is brittle and shows scratches more easily.
The gloss of plastic is determined during the extrusion process. Melt temperature is the most important controller of gloss—the hotter, the better. However, this can also lead to discoloration and brittleness.
A cooler mold, cooler melt, lower pack/hold pressure, and slower fill speeds will tend to make plastic less glossy.
Matte plastic is a common alternative to glossy plastic. It is often preferred because it doesn't show fingerprints or smudges as easily.
Glossy plastic is often used for advertising purposes as it looks good in press shots and ads. However, some consumers dislike it because it feels cheap and is more prone to scratches and smudges.
