จำนวน Repository ( 113 )

การทดสอบการอัดตัวของวัสดุผสมภายใต้สภาวะอุณหภูมิต่างๆ
การทดสอบการอัดตัวของวัสดุผสมภายใต้สภาวะอุณหภูมิต่างๆ

Brake system is used the friction between disk and pads. In the driving conditions the brake behavior from the driver is difference. Based on this reason the damage on disk and pads are occurring. Nowadays the ratio of compound materials in pads is several and involved automotive industry has not available enough to experiment. Thus it is difficult to brake pads damaged analyzing in several driving conditions. In this problem the mechanical property tester is main tool for experimental works and test procedure base on the Brake lining and disc brake pads compressibility JIS D 4413. The experiment emphasizes on the flexibility behavior and internal energy by volume with 3 types of brake lining and pads. For the experiment focused on conditions by normal apply brake repeat apply brake and suddenly apply brake. The results revealed the normal apply brake condition the maximum and minimum of flexibility behavior was appeared on brake lining and pads type A and type C with testing temperature at 200C. By the repeat and suddenly apply brake conditions the brake lining and pads type C and type A with 300C is given to the maximum and minimum flexibility behavior. In case of internal energy by volume the maximum and minimum energy was appeared on pads type C and type B at the 30C of testing temperature. For the testing temperature at 200 and 400C the pads type A and type B were got the maximum and minimum energy respectively. On the other hand at the high flexibility behavior is given to high internal energy at the high temperature of the apply brake condition.

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การเปรียบเทียบวัสดุที่ใช้ทำแม่พิมพ์ฉีดที่ทำจากอลูมิเนียมเกรด A7075 กับ เหล็กเกรด P20
การเปรียบเทียบวัสดุที่ใช้ทำแม่พิมพ์ฉีดที่ทำจากอลูมิเนียมเกรด A7075 กับ เหล็กเกรด P20

Material selection for mold making are not only material prices wages but also there are other factors such as thermal strength shine and resistance to temperature changing that caused distortion and cracks. Preform injection molding from Polyethylene Terephthalate (PET) consumes time for drying granulated plastic in 4 – 6 hours at 140 - 160°C and injects at 280 – 300 °C. This is a very high temperature to inject into mold at 10 – 15°C in cool area. The material for mold making must be able to resist to thermal shock. Today molding machines are made of grade P20 steel (Standard JIS) to produce preform that takes long cycle time due to poor cooling. The research aims to compare the pricing time in mold making to preform injection time that made of aluminum -A7075 grade and grade P20 steel. The experiment is to make a mold that made of aluminum A7075 grade and grade P20 steel injects 15 gram preform. The PET is used to blow into a blow mold with pressure at 30 – 35 bar (Two – Stage) that are 2 bottles of 350 ML. The results of material selection for preform mold making showed that aluminum A7075 grade is cheaper 27.04% the mold price is cheaper 23.6% and consumes less cycle time than grade P20 steel.

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การพัฒนาผืนผ้าด้วยเส้นด้ายพิเศษจากเศษวัสดุสิ่งทอเหลือทิ้ง
การพัฒนาผืนผ้าด้วยเส้นด้ายพิเศษจากเศษวัสดุสิ่งทอเหลือทิ้ง

The research aimed to Develop of textile in SLUB Yarn fabric from textile material waste. The purpose is to develop Fancy yarn (SLUB Yarn) from textile material waste. To develop woven with Fancy yarn (SLUB Yarn) textile material waste. To study Fancy yarn (SLUB Yarn) properties and woven with Fancy yarn (SLUB Yarn) from textile material waste. The First step is sorting and scouring textile material waste from silk yarn and to spin 2 types of Fancy yarn SLUB Yarn as 50 percent silk fiber blended with 50 percent Cotton and other type as 100 percent Silk. The Second steps is to testing of physical properties in the textile testing laboratory. The testing results are Silk Fancy yarn (SLUB Yarn) from textile material waste have twisted more than Silk blended with Cotton. It make textile material waste from Silk yarn smaller and stronger than Silk blended with Cotton and also more tenacity meanwhile it has highest tensile strength and elongation than Silk blended with Cotton. The Third steps to produce woven fabrics with plain weave structure. The weaving results have 2 fabrics the first types from Fancy yarn (SLUB Yarn) weaved by 50 percent Silk fiber blended with 50 percent Cotton in Industrial woven system and the second types from Fancy yarn (SLUB Yarn) weaved by 100 percent silk in hand woven system or with traditional weaving loom. The Last steps are to test the 8 topics physical properties of 2 woven in the textile testing laboratory. First Colorfastness to washing testing was found that Silk fabrics of Fancy yarn (SLUB Yarn) from textile material waste is durable to washing than 4.58 percent. Second Water absorbency Testing was found that both of two fabric types are equal to 60 (seconds). Third Moistures Management testing was found that the moisture absorption and wet textile as follows at 6 parts : the duration of the wet cloth was found that Silk fabrics of Fancy yarn (SLUB Yarn) from textile material waste is more absorbed than Silk fiber blended with Cotton and the duration of adsorption rate was found that Silk fiber blended with Cotton fabrics of Fancy yarn (SLUB Yarn) from textile material waste is better than Silk fabrics. The radial distribution of moisture on the both side of fabric surface was found that Silk fiber blended with Cotton fabrics of Fancy yarn (SLUB Yarn) from textile material waste is better and more effective and also there are the distribution and direction of motion better than Silk fabrics of Fancy yarn (SLUB Yarn) from textile material waste. MoreoverIt was humidity control overall properties. Forth Pilling Resistance Testing was found that both of 2 fabrics are Pilling Resistance fur and beads up on the surface slightly. Fifth Fabrics Thickness testing was found that Silk fabrics of Fancy yarn (SLUB Yarn) from textile material waste more over was 0.10 mm. Sixth Dimensional stability to washing after 5 times Testing (changes size after washing) was found that Silk fiber blended with Cotton fabrics of Fancy yarn (SLUB Yarn) from textile material waste was shrinkage after washing in the warp yarn more than -7.6 and shrinkage after washing in the weft yarn more than -7.0. Seventh pH-Acid Value Testing was found that Silk fiber blended with Cotton fabrics of Fancy yarn (SLUB Yarn) from textile material waste has pH-Acid less than 0.07. Eighth Heavy Metal Testing was found that Silk fiber blended with Cotton fabrics of Fancy yarn (SLUB Yarn) from textile material waste has 3 Heavy Metals such as chromium lead and copper while Silk fabrics of Fancy yarn (SLUB Yarn) from textile material waste has 2 Heavy Metals such as copper and lead.

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การพัฒนาสารกั้นสีจากแป้งที่ได้จากหัวบอนเพื่อใช้ในการพิมพ์ย้อมผ้าแบบรีซีสต์
การพัฒนาสารกั้นสีจากแป้งที่ได้จากหัวบอนเพื่อใช้ในการพิมพ์ย้อมผ้าแบบรีซีสต์

The purpose of this research was to study the white resist printing with colour resistant material from flour of wild taro (Colocasia Esculenta (L.) Schott) and using reactive pigment and natural dyes as dyestuffs. Five formulas of printing pastes were applied to light cotton thick cotton and silk fabrics by the use three techniques nauely Silk screen (White resist and colour resist methods)stencil and batik. The optimal ratio of colour resistant materials from flour of wild taro were compose of 20 grams flour of wild taro 32-36 ml. water 30-34 ml. sodium chloride 10-13 ml. calcium hydroxide and 1-4% vegetable oil. The viscosities of printing paste from five recipes were shown in the rage between 559.9-671.9 Centipoise. All five recipes can resist dyestuffs and also easy to remove the flour of wild taro. The pattern at resist printing area of fabrics shows sharpness and whiteness. The colour fastness to washing water and perspiration on cotton and silk fabric results were ranging between poor to fair level when using reactive and natural dyes as dyestuff. However the fastness property of pigment dye shows medium to good level. The colour fastness to rubbing is shown to be in range of 4 to 4-5 for all recipes. The ratings of colour fastness to light in terms of colour change are fair to good (4 to >6).

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การศึกษากระบวนการถ่ายทอดเทคโนโลยีการผลิตปุ่บอินทรีย์อัดเม็ดจากวัสดุท้องถิ่นของชุมชน
การศึกษากระบวนการถ่ายทอดเทคโนโลยีการผลิตปุ่บอินทรีย์อัดเม็ดจากวัสดุท้องถิ่นของชุมชน

The main objective of this articipatory research was to study technology ransfer process for producing granule organic fertilizer in Nongkrathum community using qualitative and semi-experimental methodology. The main instruments consisted of interview questionnaire and training. The samples and key informants were farmers and technology instructors. Data analysis and synthesis involved content and inductive analysis fundamental statistical analysis and Wilcoxon Sign-Rank test. Results showed that the technology transfer process was divided into three stages: 1) Knowledge and persuasion stage 2) Decision stage and 3) Implementation stage which included 2 training sessions. Only eight of farmers could participate in both training sessions. The total mean scores of satisfaction in technology were at moderate level ( =3.28) before training and very high level ( =4.25) after training. Regarding expectation of utilizing the technology before training 62.5% of farmers had high expectation. However 87.5% of the farmers had a very high expectation after training. Comparison of expectations before and after training showed significant differences at the level of .05.

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