THERMAL ANALISIS INJECTION MOLDING PADA COVER AIR FLOW TERHADAP SHORT MOLD DEFECT

Plastik Injection Molding (PIM) merupakan proses produksi pembentukan material plastik dari material resin berbentuk butiran yang digunakan dalam membuat suatu komponen manufaktur. Defect atau kecacatan yang umumnya terjadi pada plastik injection molding yaitu short mold yaitu kondisi dimana part yang dihasilkan tidak terisi material plastik secara sempurna. Pada penelitian membahas tentang analisa panas pada cover air flow terhadap short mold defect. Metode yang digunakan adalah metode perhitungan actual dan analisa aktual terhadap part injection kemudian membandingkan hasil dari variasi suhu. Material yang digunakan dalam penelitian ini adalah Polypropylene (PP) dengan grade M560 yang dimasukan kedalam injection molding dengan tekanan 96 Mpa. Suhu yang akan dianalisis yaitu 130̊C dengan cooling time 15 second , suhu 150̊C cooling time 19 second dan suhu 170̊C cooling time 23 second. pada barrel. Hasil penelitian ini menunjukan temperatur 170̊C dengan cooling time 23 detik dapat mengatasi masalah short shot pada cover air flow pada saat proses injection part.

STUDY OF DEFECT ON LLDPE PLUG FOR TELON OIL PRODUCTS USING A HAITIAN MOLDING INJECTION MACHINE 1600MA AT PT X

The type of plastic packaging that is popular among the public is bottle packaging, plastic bottle packaging always has a bottle cap. Some people only know that the part of the bottle cap is only on the outer cap, even though the plastic bottle cap consists of two types, namely the outer cap (cap) and the inner cap (plug). The plastic material used to make the plug is Linear Low Density Polyethylene (LLDPE), a telon oil plug is produced using an injection molding machine, by inserting plastic pellets into the hopper and then heating it by the barrel, plastic pellets that have melted will be injected into the mold ( print). In the process of making the telon oil plug, a defect was found. From the observation, it is known that several types of defects that occur during the LLDPE oil plug production process include black dot, flashing, and unmould / short shot. Defects that occur during the telon oil plug production process are caused by damage, contamination, and mismatches in the engine parameter settings. The purpose of this study is to determine the causes and solutions of defects that occur in LLDPE telon oil plugs with the HAITIAN 1600MA injection molding machine at PT X. Some solutions are made to reduce defects that occur in telon oil LLDPE plugs is to clean the material reservoir, repair or replace the mold, clean the hopper before loading the material, and set up the barrel parameter 180-230oC, inject pressure 60 bar, holding pressure 30 bar, speed 17.8 seconds.

IDENTIFICATION OF DEFECTS OF PET AND HDPE-BASED DRINKING WATER PACKAGING PRODUCTS

Increased community mobility has an impact on increasing demand for packaged beverage products. Data from Aspadin (the association of bottled water companies) there are more than 1500 brands of bottled water (AMDK) in Indonesia and it is estimated that trade will continue to increase every year. However, the profit margins of bottled drinking water products are not classified as high, so producers must do efficiency. One form of efficiency that can be done is to reduce the waste of packaging production, where most bottled water is made of plastic. This study aims to identify several product defects that often occur during the production process of bottled water based on PET. The process of making plastic-based drinking water packaging is divided into 3 stages. First is to make a bottle preform, the second is the blow molding process, which is the process of making a whole package from a preform, and the third is the process of making a lid. The machines used in these stages are different and in each of the stages successfully classified types of product defects. During the preform manufacturing stage, black specks or contaminants, short shots, bubbles, and flash are found. At the stage of making the whole bottle includes, off center base, failed blowing, arising bracelet, rough parting line. The last defect in the process of making the cap includes excess material flash Short shot, bridge or ring break, leak centergate.

Numerical Simulation during Short-Shot Water-Assisted Injection Molding Based on the Overflow Cavity for Short-Glass Fiber-Reinforced Polypropylene

Compared with water penetration condition of short-shot water-assisted injection molding with or without overflow cavity, it can be known from theory and common knowledge that short-shot water-assisted injection molding with overflow cavity has many advantages, such as it can save materials and energy. Then, the effects of melt short shot size, water injection delay time, melt temperature and water injection pressure on the penetration of water after penetration, and the orientation distribution of short fibers during water-assisted injection molding of the overflow cavity short-shot method were studied. It is found that the melt short shot size had the greatest influence on it, followed by water injection pressure, water injection delay time, and finally, melt temperature. With the increase of the melt short shot size, the thickness of the residual wall of the whole main cavity becomes thinner, the orientation of short fiber along the melt flow direction becomes higher, and the degree of fiber orientation changes becomes lower. In the front half of the main cavity, with the decrease of water injection pressure, the delay time of water injection, and the melt temperature, in the front part of the main cavity, the residual wall thickness becomes thinner, the fiber orientation along the melt flow direction becomes lower, and the fiber orientation changes degree becomes higher; in the latter half of the main cavity, the influence of the water penetration and the orientation distribution of short fibers along the melt flow direction are not significant.

ANALYSIS OF INJECTION MOLDING PROCESS TO REDUCED DEFECTS (SHORT-SHOT)

This paper deals with optimal injection molding process parameters for minimum short shot. In this study, analyses of injection molding process parameters were carried out to reduced defects and minimize short shots. Optimal injection molding conditions for minimum short shot were determined by the DOE technique of Taguchi and the analysis of variance (ANOVA) methods. For this study CPVC plastic specimen was tested. Determination of the optimal Injection molding process parameters were based on S/N ratios. According to results mold closing speed had significant effect on quality characteristic. Mold pressure and Injection pressure had no significant effect

METODE FAILURE MODE AND EFFECT ANALYSIS UNTUK MENGURANGI CACAT PRODUK

PT. DMIP merupakan perusahaan yang bergerak dibidang industri dengan berbahan baku plastik,i memiliki target maksimal persentasi cacat yaitu 3%. Tercatat pada tahun 2017 dari 13 produk yang di produksi terdapat 12 produk yang melebih batas toleransi. Hal ini dapat dikatakan bahwa pengendalian kualitas terhadap produk masih kurang dilakukan oleh perusahaan. FMEA merupakan prosedur terstruktur untuk mengidentifikasi dan mencegah sebanyak mungkin mode kegagalan. Tujuan proses FMEA adalah untuk menentukan prioritas perbaikan produk, untuk menghilangkan potensi kegagalan produk dan mengurangi peluang terjadinya potensi kegagalan produk yang kemudian diberikan usulan perbaikan produk untuk mengurangi dan mencegah mode kegagalan. Pengolahan data yang telah dilakukan yaitu identifikasi produk dengan jumlah cacat tertinggi, identifikasi jenis dan penyebab cacat, penentuan urutan prioritas perbaikan berdasarkan nilai RPN dan usulan tindakan perbaikan. Berdasarkan hasil penelitian, produk yang mempunyai jumlah cacat paling banyak adalah splash b, mini splash b dan jumbo splash b dan terdapat 4 jenis cacat seperti black spot, spotting, crack dan short shot. Produk cacat disebabkan oleh manusia, metode dan mesin. Berdasarkan nilai RPN, urutan prioritas perbaikan yang dilakukan adalah untuk cacat black spot dan spotting, lalu cacat crack dan short shot. Sedangkan untuk langkah perbaikan, usulan tindakan adalah menetapkan standar prosedur dalam bekerja (SOP) secara tertulis dan pengaturan mesin, menetapakan standar pengontrolan operator, membuat pelatihan khusus bagi operator, melakukan perawatan mesin, dan menetapkan standar penggantian cetakan. Dengan beberapa tindakan perbaikan yang direkomendasikan diharapkan jumlah kecacatan terhadap produk yang dihasilkan dapat berkurang.