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Widjaja, Hartono
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Computer Science & IT Control & Systems Engineering Electrical & Electronics Engineering Industrial & Manufacturing Engineering Mechanical Engineering Social Sciences

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Analisis Penambahan Warna Masterbatch 1%, 5% dan 15% Terhadap Kekuatan Tarik Material Plastik Polypropylene (PP) Vita; Widjaja, Hartono
JTRM (Jurnal Teknologi dan Rekayasa Manufaktur) Vol 4 No 2 (2022): Volume: 4 | Nomor: 2 | Oktober 2022
Publisher : Pusat Penelitian, Pengembangan, dan Pemberdayaan Masyarakat (P4M) Politeknik Manufaktur Bandung (Polman Bandung)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.48182/jtrm.v4i2.109

Abstract

Plastic has a very big role in everyday life, usually used for household needs, and in the automotive industry. One of the most widely used types of plastic is polypropylene (PP). Polypropylene (PP) has unique properties, flexibility, and a relatively low melting point that makes it stand out as an excellent material for a variety of applications such as ropes, hinge caps, food packaging, and the automotive industry. The addition of dyes to plastic materials can affect the good properties of plastics, one of which is tensile strength. In general, the addition of dye is given as much as 1 kg of granulated dye compared to 25 kg of plastic (4% granulated dye). This study aims to determine the tensile strength of polypropylene (PP) plastic material with the addition of 1%, 5% and 15% dye. So, it is necessary to test to assess the tensile strength which consists of 3 (three) components, namely: 1. Yield strength. 2. Maximum tensile strength and 3. Modulus of elasticity. The manufacture of product specimens uses the ASTM D638 standard and is made using the injection molding process. The values of yield strength, maximum tensile strength and modulus of elasticity on plastic materials without added dye were 30.02 N/mm2, 42.47 N/mm2 and 0.43 GPa. While the addition of dyes of 1%, 5% and 15% respectively the values are 1. Yield Strength of 32.53 N/mm2, 30.59 N/mm2 and 28.29 N/mm2, 2. Maximum tensile strength of 46.13 N/mm2, 45.33 N/mm2 and 41.57 N/mm2, 3. The elastic modulus are 0.58 GPa, 0.55 GPa and 0.42 GPa. The results showed an increase in the value of yield strength, maximum tensile strength and modulus of elasticity at the level of addition of 1% dye, but the value decreased with the addition of dye by 5% & 15%.
Pengaruh Tekanan Injeksi pada Suhu Mould yang Tidak Sesuai terhadap Low Length Material Plastik ABS dengan Tebal Produk 1MM Widjaja, Hartono; Rahajo, Andika
JTRM (Jurnal Teknologi dan Rekayasa Manufaktur) Vol 5 No 1 (2023): Volume: 5 | Nomor: 1 | April 2023
Publisher : Pusat Penelitian, Pengembangan, dan Pemberdayaan Masyarakat (P4M) Politeknik Manufaktur Bandung (Polman Bandung)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.48182/jtrm.v5i1.110

Abstract

One example of a plastic material is ABS (Acrylonitrile Butadiene Styrene) which is a type of thermoplastic plastic. Thermoplastics are organic synthetic materials that melt when heated and can be formed under the influence of pressure. In the book “Molding Simulation: Theory and Practice, there is a table of reasonable design values for the L/t ratio. The table states that the flow length of ABS material with a product thickness of 1mm is 100mm-200mm. This study aims to determine the flow length of ABS material at the lowest and highest injection pressures with a mold temperature of 25 °C (the correct plastic material mold temperature is 50 - 80 °C), to find out the comparison between the trial results and the reference table, to determine the effect of injection pressure on flow. length ABS plastic material on the long and short runners. Based on the conditions and parameters used in this study, it was found that the greater the injection pressure, the longer the resulting flow length and the mold temperature affecting the resulting flow length. And in order to obtain a flow length or flowability in accordance with the table of reasonable design values for the L/t ratio, the correct width of the product/specimen mold is 7.941 mm for the long runner and 12.687 mm for the short runner.
Pengaruh Tekanan Injeksi terhadap Flow Length Material Polypropylene (PP) dengan Ketebalan Produk 1MM Widjaja, Hartono; Fauzan, Mochammad
JTRM (Jurnal Teknologi dan Rekayasa Manufaktur) Vol 5 No 1 (2023): Volume: 5 | Nomor: 1 | April 2023
Publisher : Pusat Penelitian, Pengembangan, dan Pemberdayaan Masyarakat (P4M) Politeknik Manufaktur Bandung (Polman Bandung)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.48182/jtrm.v5i1.111

Abstract

Injection molding is the injection of melted plastic material into a mold to form a product. A good formulation of the injection process is affected by several factors, factors that affect the injection process include the plastic melt temperature, product design, injection speed and injection pressure. This study examines the parameters that affect the flow length of the polypropylene (PP) material. This material was chosen because it is commonly used in life, such as food and beverage containers. This study aims to determine how far the flowability of PP plastic with a product thickness of 1 mm is based on the table of reasonable design values for the L/t ratio in the book Molding Simulation: Theory and Practice. This research method goes through several steps including, creating a cavity layout to form the research specimens, analysis of specimen molds, trial molds with calculated parameters and changing injection pressure parameters gradually, measuring and assessing the resulting flow length of the injection trial process, concluding the experimental results. The results of this study are expected to be taken into consideration when designing a product made from PP so as to minimize failures in the mold making process.
Analisis Springback Pelat ST 37 dengan Tegangan Tarik 343 N/mm2 Tebal 1,98 mm pada Proses V-Bending Dengan Sudut 120, 135, dan 150 serta Arah Tekukan Berlawanan Grain Direction Pelat Widjaja, Hartono; Khairuman, Rizq Rafi
JTRM (Jurnal Teknologi dan Rekayasa Manufaktur) Vol 7 No 1 (2025): Volume: 7 | Nomor: 1 | April 2025
Publisher : Pusat Penelitian, Pengembangan, dan Pemberdayaan Masyarakat (P4M) Politeknik Manufaktur Bandung (Polman Bandung)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.48182/jtrm.v7i1.176

Abstract

Springback is a deviation in the bending angle which tends to return to its original position due to the remaining elasticity of the material in the bending area which crosses the plastic material boundary. The five main parameters that influence springback are punch/die profile, work material, material properties, bending technique, and process conditions. This research focuses on the angle of impact which influences the amount of springback. Tests were carried out with punch angles of 120˚, 135˚, and 150˚ using an AIDA direct servo press machine forming the DSF-C1-A series. The results show that the larger the punch angle, the smaller the springback. All angles produce negative springback values, with the 150° strike angle of -0.990° closest to the target angle. The amount of springback can be calculated using a simple linear regression formula. The angular deviation due to springback can be used as a compensation value in making bending tools to obtain the desired bending results.
Co-Authors Fauzan, Mochammad Khairuman, Rizq Rafi Rahajo, Andika Vita