Finishing Techniques for Leather

Finishing Techniques for Leather Summery These papers make a brief clarification of some of the finishing technique which is to applied to two finishing procedure and clarification for full grain aniline leather finish and a full grain pigmented leather finish the material to be used in it and whey to apply such material for such both finishing type . also an observation on the needs for the finish for the leather . also a describe for the difference between the pigment and the dyes from their origin and behavior and other points of study for them . and after that an investigation about the organic and the inorganic pigment and the difference between them . plus a brief explanation about the comparison between cationic and ionic dyestuffs. more a study about two formulation for shoe upper finish for aniline and pigmented full grain leather plus study for the material to be applied for them . then end with product understanding from stahl mentioning their use and needs in the finish formulation and monitoring their behavior. Introduction Finishing The term finishing is applied in the leather industries to help enhance the properties and the appearance of the final piece of the leather its gives the leather more enhanced color and remove defaults that could be caused through the leather operation or a nature defect. The piece of leather is enhanced by treating it with dyestuff solutions, pigments, preparations, top coating then it enters he mechanical treatment in terms of plating. The basic rule in the leather finishing is the fewer blemishes on the raw hide The less finish has to be applied. The more grain layers is damaged layer is damaged, the more coats the leather required to replace The natural grain. Also the purpose of finishing is to provide different types of leather with special characteristics satisfy the requirement markets, The processes of finishing the leather give the leather upgrading of the following characteristics such as Color , brightness , matting , feel , softness , print pattern , water resistance and more . Part 1 Dyes and pigments Both dyes and pigments are powerful colorants material used to color other substances Pigments Pigments are the special type of dyeing material for wet processing technology. Pigment can also be define as a water insoluble coloring material and a coloring substance that makes the color of the product look different because of its absorption of certain wavelengths . dyes Dyes are substances found naturally and also made synthetically too . Dyes have the ability to change the color of the leather and material which they are applied. In earlier times, most of the dyes were obtained from plant sources , roots ,wood , stem bark and plants leaves . also in the 19th century synthetic dyes were produced and since then many of synthetic dyes have been produced . Special needs for the dyes in the surface coating where a high level of transparency is required, Dyes vs pigments Organic and inorganic pigments . The difference between organic pigments and inorganic pigment are based upon some principle factors. Such as Molecular structure of the pigments Carbon chains or carbon rings are always presented in the molecules of the organic pigments. But in the molecules of the inorganic pigments , the cations of metal are found in an array from the non-metalic anions . which with this arrangement does not allow these pigment to dissolve in the solvent . Source of pigments the main source of organic pigment are plants and plant products. The inorganic pigment are manufactured from topical cosmetic and dirt . Inorganic pigment are non-ferrous metal oxides , or some metal insoluble metal salts . Main difference between inorganic pigment and organic pigment Cationic and ionic dyes . Anionic dyes have a negative charge and attached to cationic surfaces, Cationic dyes have a positive charge and attached to anionic surfaces, The cationic dyes react with anionic sites on the surface of the substrate, the cationic produce a bright shades. The solubility of these dyes is very good in water in the presence of glacial acetic acid . Both anionic and cationic dyes have poor levelling properties . Part 2 One can ask the question. Why are there so many different types of leather ? simple answer is its all down to cost . The tanner should have the experience to sort and select the leather after the chrome tanning to forward each type leather batch selected and sorted to its category end use type product . The tanner forward the sorted chrome leather batches to the retanning and dying process. Such sorting is done according to the hide size, grain condition, surface grades , extra†¦ When it comes to finish the leather. The tanner already sort the leather in previous states So he knows what is he going to do with such sorted leather to apply the required finish to it . Almost all types of hides and skins can be finished . The final uses of the different leather leads to the type of the finishing to be applied . Type of the finish the tanner choose depend on the appearance he want sell his leather with it . Among of the types of finishing types of leather is. a – Aniline finish ( full grain aniline leather finish ) Aniline leather is the most natural looking leather with the unique surface characteristics of the hide remaining visible . To get such aniline leather you need to apply what’s called â€Å" aniline finish â€Å" Leather with an aniline finish is colored with dyestuffs only which means no opaque finish ie transparent finish so that the original grain surface can be seen through. Another transparent top coat can be applied to give bright finish and water repellent surface . Aniline finished leather has excellent tooling , polishing , and redyeing properties . B – Pigment leather finish ( full grain pigmented leather finish ) Such pigmented finish contains no aniline dyestuffs . the dyestuffs are all replaced with an opaque inorganic pigment , such mixture is bound together using a small amount of casein and a use of a binder ( mostely is thermoplastics type ) to form a continuous film , resulting in a more level finish and better coverage of the finish skin . The presence of such small amount of casein contained in the finish ensures the leather does not become sticky . After the leather is finally coated with a matt or bright water based lacquer emulsion to enable sealing the finish to give certain amount of resistance to wet , dry rubbing . Full grain aniline finish vs full grain pigmented finish

HIV/AIDS Policies in the US

Today, the 26 year old HIV/AIDS is becoming one of the major challenges facing health-care policymakers worldwide (HIV/AIDS Policy in the US, 2006). According to Collins (2007), there are over 1.5 million HIV infections and more than half a million deaths into HIV/AIDS afflicted in the United States.The acronym AIDS stands for acquired immunodeficiency syndrome and describes the collection of symptoms and infections resulting from the severe damage of immune system caused by the HIV in humans.On the other hand, HIV stands for human immunodeficiency virus, a retrovirus that infects cells of the human immune system, and destroys or impairs their function (Fast facts about AIDS, n.d.; AIDS 2006).The introduction of HIV infection into the human body results to progressive depletion of the immune system, leading to immune deficiency. People who are described as immune-deficient are highly vulnerable to a wide range of infections known as opportunistic infections that take advantage of a w eakened immune system.Hence, it is vital to measure the level of HIV in the body and the appearance of certain infections as these are used as indicators that HIV infection has progressed to AIDS (Fast facts about AIDS, n.d.; AIDS 2006). With these, there are numerous policies and guidelines published to fight against HIV/AIDS.EVIDENCE OF THE PROBLEMAccording to the Center of Disease Control (CDC), the cumulative number of estimated deaths in the U.S. of persons with AIDS through 2005 are 525,442, including 4,865 children under the age of 13 and persons living with AIDS are 437,982 (HIV/AIDS in the United States, 2007).In the past two decades, the demographics of HIV/AIDS have changed, moving from an illness that initially affected white gay men to a disease that increasingly affects men of color or African men who have sex with the same sex, women and older adults (Gorin, 2004).The prevalence rates of AIDS among African American men and women rose up by 150 percent between 1993 and 2001 compared with a 68% rate increase among white people.The rates of HIV/AIDS among communities of color were notably higher than those for white people when considering their percentage of the total population. For instance, the African Americans only make up 12% of the U.S. population, however account for 76.3% of individuals with AIDS.In addition, African American teenagers ages 13 to 19 make up only 15% of U.S. teenagers, but account for 61% of new AIDS cases reported among teenagers in 2001 (KFF, 2003a). This shows that African American or communities of color have high incidence of HIV/AIDS compared to white people both in the teenage or adult population.On the other hand, women represent an increasing proportion of new AIDS cases. The epidemiology shows that African American women represent a greater number of AIDS cases than white women.There were 7,113 newly reported AIDS cases among African American women in 2001 compared with 1,981 among white women. These correlates s uggest that women in communities of color have a higher probability of contracting HIV/AIDS than white people (KFF, 2003b).In addition, majority of women in all groups are most likely to have been infected by heterosexual contact and injection drug use. The results shows that 67% African American are infected by heterosexual contact compared with 59% white women while 30% African American are infected through drug injection compared with 38% white women.This shows that HIV/AIDS contracted with heterosexual contact is higher in African American women while HIV/AIDS contracted with the use of drug injection is greater in white women.   Furthermore, heterosexual contact accounts for 75% of HIV infection among women 13 to 24 years of age (KFF, 2003b).These show that teenage or young adults are engaging to sexual intercourse at an early age give them higher risk of being afflicted with the disease.Among older adults, the CDC estimates 42,104 people ages 55 and older were living with AI DS in 2002, including 8,902 people 65 and older (CDC, 2003). Among older adults, the risk is particularly high for gay men who abuse drugs or engage in anonymous sexual encounters and for women above 60 years of age, who is due to normal bodily changes, face higher risk for HIV infection during intercourse.Even though little attention has been given to preventing HIV and AIDS in older adults, there are numerous older adults that do not understand the importance of condom usage or other precautions when engaging in sexual contact.In addition, many physicians fail to provide the information on the related risk factors of HIV/AIDS or discuss the necessary information to help older adults protect themselves against infection (Laurence & Luciano, 2000).Hence, this reflects the general perception that the older adult population is not at risk of HIV and society's reluctance to discuss at-risk behaviors. For these and other reasons, older adults have been called a â€Å"hidden HIV risk gr oup† (Gorin, 2004).

Anne Sexton Confessional Poetry Analysis - 1192 Words

Her style of poetry, confessional poetry, was used in a way to connect with her audience as stated above, and without it, she would have been unable to achieve the level of rapport necessary to reach her popularity. Confessional poetry is the poetry of the personal or I, and it began to emerge in the late 50s and early 60s (A Brief Guide to Confessional Poetry). It is associated with poets like Robert Lowell, Sylvia Plath, Anne Sexton, W. D. Snodgrass, etc., with Lowell playing teacher for both Plath and Sexton. This poetry movement was all about opening closed doors, allowing the discussion of topics that were once considered forbidden and shameful. Anything once indecent to mention in polite company was used to prove a point, to†¦show more content†¦While Plath is proud embracer of her nihilistic vision, mythologizing death and misery and silence and choosing artistic brilliance often over the more personal to achieve the myth she wishes to create for her readers, Sexton s peaks more longingly, hopefully (Johnson). Her poetry is more about trying to gain back the wholeness she feels is missing, the desire for a healthy and complete world, though she may doubt its existence. Her poetry is about the struggle, the blunt nature of desire and the often-impossible odds. Her power, more than anything, is her use of her own vulnerability, perhaps making her even more vulnerable than many of her fellow confessional poets. And then using her craft to make all of her audience feel it, like shes engraving her uphill battle into their chests. That is her trademark. Through the use of one of her poems, Knee Song, it is easy to see the wistful nature of her poetry. Being kissed on the back of the knee is a moth at the windowscreen and yes my darling a dot on the fathometer is tinkerbelle with her cough and twice I will give up my honor and stars will stick like tacks in the night yes oh yes yes yes two little snails at the back of the knee building bon- fires something like eye- lashes something two zippos striking yes yes yes small and me maker (Anne Sexton: Poems).Show MoreRelatedConfessional Poetry Essay1640 Words   |  7 PagesConfessional poetry is a style that emerged in the late 1950’s. Poetry of this type tends to be very personal and emotional. Many confessional poets dealt with subject matter that had previously been taboo. Death, trauma, mental illness, sexuality, and numerous other topics flowed through the works of the poetry from this movement. Confessional poetry was not purely autobiographical, but did often express deeply disturbing personal experience. (Academy of American Poets) Three importantRead MoreImportance Of Feminism Within Writing1938 Words   |  8 PagesThelma Barraza Professor Olson LIT-230-02 November 24, 2014 Anne Sexton: Importance of Feminism within Writing Anne Sexton was born Anne Gray Harvey on November 9, 1928 in Newton, Massachusetts. Her parents, Ralph Harvey and his wife, Mary Gray Staples Harvey overlooked their youngest child Anne. According to the Great Lives from History, she grew up lonely and excluded from family activities, because she was never able to reach the standards her father wanted. She felt overlooked and unwanted, andRead MoreConfessional Mode in Poetry of Kamala Das3267 Words   |  14 PagesCONFESSIONAL MODE IN POETRY OF KAMALA DAS Confessional mode of writing has its virtual origin in the mid50s in America. It is hybrid mode of poetry which means objective, analytical or even clinical observation of incidents from one’s own life. Confessional poems are intensely personal and highly subjective. There is no ‘persona’ in the poems. ‘I’ in the poems is the poet and nobody else. The themes are nakedly embarrassing and focus too exclusively upon the pain, anguish and ugliness of life atRead MoreMutilating Self Into Spirit: Sylvia Plaths Poems.4131 Words   |  17 Pagesmetaphors and irony in literature. He has highlighted the use and importance of irony in a very impressive and literary way. His article Irony as a Principle of Structure is an excellent piece that stresses and underlines the importance of irony in poetry. According to Brooks, this was one way to visualize the impact of the context in regards to the literary techniques. The backbone of his article is the irony used in any literary work. He believes that this is the key technique to make the poetic

Story Of Jesus - Free Essay Example

Sample details Pages: 2 Words: 512 Downloads: 4 Date added: 2019/07/01 Category Religion Essay Level High school Tags: Jesus Christ Essay Did you like this example? As we’ve read in class, there many moments throughout the book of Luke were Jesus would take time away from his followers and seek solitude. Over the course of Thanksgiving break, I replicated this as best I could and kept a journal of my most intimate moments alone with Jesus and I’m not too proud of what I found. At first, I didn’t take this journal that seriously. I thought that I had a great relationship with Christ and so this would be easy for me to accomplish. However, I wasn’t prepared to become totally lost in my own jungle of thought and doubt just as Jesus was. I’m not in any way saying that I view myself to be a better writer than Luke, but I feel I did a good job recording my own experiences during the course of break. During the very rare quiet moments in my house, I Found myself alone in my room trying to seek God. It was, to my suprise, much more difficult than I originally thought. As I laid in my bed, my mind would wander to and fro and I would find myself thinking about my future, my many mistakes I made in my past, and what plan God has in store for me. I desperately wanted to hear him. I cried out to him asking for peace of mind and for his guidance. Don’t waste time! Our writers will create an original "Story Of Jesus" essay for you Create order Almost immediately after crying out to God, I found myself more at ease and ready to roll with God. As I said in the begging, where I went in those quiet moments really did frighten me. However, in those dark moments, found myself growing closer to God. I recalled in class while on my own journey, we talked about what it meant to be â€Å"in between the two trees.† This is the idea that humans are between both God and Satan. We are subject to all of this sin and misfortune in this world because we chose to forsake God’s love and grace and exchanged it for the harsh reality of the world we live in today. Despite all of the pain, suffering, and sin of our world which we’ve caused with our own hands, God still wants to form a relationship with us which he showed through his son Jesus. As I mentioned above, throughout the book of Luke, there are several instances where Jesus sought solitude which I would like to highlight. Luke 4:1-2, 14-15. After Jesus was baptized, He spent 40 days praying in the wilderness. After this He was tempted by Satan and then began His public ministry. Luke 6:12-13. Early in His ministry Jesus spent the whole night alone in prayer. The next day He chose his 12 disciples. Luke 22:39-44. Hours before Jesus was arrested He went to the Mt. of Olives and went a short distance away from His disciples to pray. He was in great emotional agony knowing what he was about to face. Luke 5:16. Many times in Jesus’ ministry He spent time alone in prayer.