Mass Pigmentation Essay

3244 words - 13 pages

1.0 Introduction
2.0 Mass pigmentation
3.1 Definition Features of a pigment Aplication of pigments.
3.2 Mass pigmentation application characteristics.
3.0 Textile spin finishers and finishes
4.3 Definiton
4.4 Classification of finishes
4.5 Pre-treatment processes
4.6 Important finishes

This is a research assignment on mass pigmentation, being a part of Textile raw materials MIT 221.

Mass pigmentation is the incorporation of the pigment in a molten polymer mass during processing into a compound or molten batch or when ...view middle of the document...

The term mass pigmentation encompasses al the processes by which metal flakes are combed with polymer to ultimately form a finished article. Of these methods injection moulding is the most technically challenging because it has the most variables requiring control. They include;
i. Colour
Colour in the context of pigments generally means brilliance/brightness. It broadly corresponds to cleanliness in organic pigments. Metallic colour is influenced by the surface finish of the pifgment,its tint strength and its concentration.
The specific case of alluminium pigments, improved colour equates to increased whiteness. These properties are in turn dependant on the particle size distribution and the surface brightness of the flake.
ii. Dispersability
The process of dispersion starts with a combination of metal flakes and polymer in dry state. Masterbatch preblending is used here. Masterbatch in this context covers the metal flake pigment damped or carried by any suitable organic material such as a plasticizer or a polymer.
A short period of dry tumbling erg in a double can blender should be sufficient for most commonly available alluminium pigment masterbatches. High speed powder blenders are not recommended for two reasons:
a) There is a danger that the high shear will break down the masterbatch, releasing single flakes with a consequent danger of explosion.
b) The same high shear can bend or break the flakes leading to a loss of metallic brightness.
Most metal flake pigments are very resistant to heat. The flakes themselves remain stable well above the highest polymer processing temperatures. In practice, the maximum processing temperature is often dictated by the polymer.
iii. Opacity and tint strength
Opacity or hiding power is a function of flake diameter, thickness and density of the metal. At constant thickness and density, opacity is roughly proportional to the inverse square of the diameter. The smaller the diameter or thickness, the higher the total surface area. With more surface area available to obliterate the substrate, opacity is higher.
Tint strength refers to the ability of a metal pigment to modify the colour depth of a colourant with which it is incorporated.
Thus a deep blue metallic effect will become paler if further metal flake pigment is added to the formulation.
A finer particle size flake will create a greater colour shift than the same weight of a courser flake. Increasing flake thickness i.e. reducing the aspect ratio is practiced to improve degradation resistance. It is at the expense of opacity.
Folded and bent flakes have an ambivalent effect on opacity. Folded and bent flakes have reduced effective surface area.
Alternatively if the focus becomes thinned and breaks, surface area is increased. This is however accompanied by loss of brightness due to both increased concentration of fine particles and the disruption of uniform orientation...

Other Essays Like Mass Pigmentation

Living In A Cashless Society Essay

1637 words - 7 pages Money in a traditional sense no longer exists. Money is becoming much of a concept than a physical material, and most ordinary bitter have not see the reality of the switch. People today are using credit and debit cards on a regular basis and in everyday situations such as meal purchased at fast food, highway tolls, clothing, groceries, gas stations, etc. all of these means of systems could be regarded as a cashless society or world. The question

The French And Indian War: The "Real" First World War

1955 words - 8 pages The Seven Years War, or more commonly referred to as “The French and Indian War”, has been called the true First World War. In this book The French and Indian War: Deciding the Fate of North America, the author and historian Walter R. Borneman paints a detailed and elaborate picture that justifies the claim of it being the first true war of global proportions. If ever there truly was a climax to the never ending feud of the European powers

Is The Use Of Animals In Medical Research A Necessary Measure?

1513 words - 7 pages Throughout history, animals have been used in experiments to test product safety and obtain medical knowledge that benefits both humans and animals alike. Every year there are numerous medical breakthroughs, such as medications and surgical instruments, which are tested on animals to insure their safety before they are deemed acceptable for human use. Even though the results of the experiments saved millions of human lives, they are also

Education And The Evolving Job Market

2363 words - 10 pages The lives of students today are changing. They are preparing for lives and jobs that have never before existed. If teachers hope to have a significant and worthwhile impact on these quickly changing lives, they must change the way they think, prepare, and instruct our future generations. Children cannot afford to have teachers who remain stagnant in their methods and ideals. Students crave instructors that are willing to allow them to tap

Young And Relentless

1737 words - 7 pages teenager’s sexual behavior. Many of these teens try to avoid the awkward sex talks arranged by parents which make sexual activity more likely to occur. As a result, this topic has had a major influence among today’s group of teenagers. Talking with teens and educating them about sex, can influence and thus change their perception towards the advertising campaigns and media relating to this expanding issue. In mass media, the advertisements that depict

The Natural Law Theory

1231 words - 5 pages Obeying by the natural law theory is the only true and moral way to live life; especially a life lived in God’s image. God’s presence is a guiding factor to obtaining a moral and virtuous life, which can only be obtained by following the natural law theory. God created a set of laws as a supreme guide for humans to live life, like any law these laws were created to ensure wellbeing for everyone. The laws he created are the civil law, the natural

Resolved: Presidential Signing Statements Threaten To Undermine The Rule Of Law And The Separation Of Powers

1811 words - 8 pages signing statements, such as the decision made in INS vs Chadha, but it was the Reagan administration that took action to create structure for presidential signing statements (Kelley, 2007) It was in 1986, during Reagan’s presidency, that “the Department of Justice developed a system for using the signing statement and a strategy for making them effective” (Kelley, 2007). Finally, signing statements gained mass public attention, and a connotation

Oppressive Systems Of Government In Egypt And Animal Farm

1529 words - 7 pages As in Egypt, Orwell demonstrates through his allegorical novel “Animal Farm” that leaders are able to establish and maintain power over a people, and in turn create an oppressive and corrupt government system. Orwell shows the significant difference in the education and levels of knowledge in the animals, and how the government takes advantage of this difference. The split between the levels of intelligence is portrayed in the first chapter when

The Pathway To Psychosis

1415 words - 6 pages “How all occasions do inform against me” is a line from act IIII, scene IIII of William Shakespeare’s Hamlet. This line, spoken by Hamlet, expresses his emotional state as he is currently overwhelmed by the death of his father, the king of Denmark, and the situation surrounding it. After Hamlet learns of his father’s death he finds out that his mother has married Claudius, Hamlet’s uncle. On top of all of that, Hamlet soon after

Rated “M” For “More Censorship Not Needed”

1241 words - 5 pages Since the moment video games became a commercial success there have been people who have pushed for unfair amounts of censorship to be placed upon the content of the games and its availability to children. These groups push for increased regulations on content but there is already an appointed group to handle this issue, the ESRB. Even though there has been an increase in mature content in the video game industry, increased censorship is not

Four Components Of A Legally Astute Social Media Marketing Manager

1914 words - 8 pages With the advances in technology constantly changing companies have to find better ways to market their products to consumers. The explosion of Facebook has given companies a way to market products to consumers. Examine how a legally astute manager can use social media to his advantage. Review different forms of dispute resolution and determine which one works the best. What is the best course of action, the government can use to

Related Papers

Human Evolution And Climate Change Broad Topic: Climate Change And Evolution

3397 words - 14 pages efficient sweating mechanism (Jones 48).Body sizeLarge bodied humans with shortened extremities can tolerate cold climates better, because less heat loss occurs (Jones 46). Vasoconstriction of blood vessels can cause a decrease in blood to such extremities. In humans and other animals that use sweat for cooling, a high ratio of skin surface to body mass is advantageous in heat regulation (Jones 46).Skin colorMelanin in the skin, which is

The Separation Of Capital Ownership And Control

1577 words - 7 pages The argument of whether the separation of capital ownership and control is an efficient form of organization has constantly been a controversial issue. The criticism whether the controllers’ act is in the best interest of the owners’ wills never end as long as hired managers operate management. As the number of public companies has been increasing over the course of this century, meanwhile the American style of contact based corporation has

The Versatility And Flexibility Of Oled's

1014 words - 5 pages In April 1, 2002, organic light emitting diodes gain rise in the scientific community with their published, more practical form at Ames Laboratory. “Scientists at the U.S. Department of Energy's Ames Laboratory, in collaboration with scientists at the University of Michigan, Ann Arbor, have developed and demonstrated a novel, fluorescence-based chemical sensor that is more compact, versatile and less expensive than existing technology of its

Comparing The Moral Virtues Of Antony And Julian The Apostate

1103 words - 5 pages Roman emperor Julian the Apostate and Christian leader Antony both exhibited many qualities of character during their existence. Both of them led very distinctive lives although shared several ethical values. Book 25 of “The Later Roman Empire” and the book “Early Christian Lives” show concrete evidence of this. In the following essay, I will argue how both leaders’ lives were devoted to their religious beliefs and their mutual cardinal virtues