The study of water absorption by capillarity on paper with a simple technique is simple but important to do to inform the public about the characteristics of paper and for the development of research on the absorption of different types of paper. In this study, five types of paper were used, namely HVS paper, cardboard, tissue paper, concord paper and buffalo paper. In the capillary water absorption test on paper, the physical quantities analyzed are the water absorption, the absorption time and the water absorption rate. The capillarity of the paper is a comparison of the rate of water absorption by the paper which is analyzed using the straight line movement approach. The value of water absorption is estimated using the ratio between the height of water absorption and the time absorption. Based on the results of the capillary test on paper, it was found that the water absorption height for the five types of paper increases with increasing absorption time. The highest water absorption capacity is tissue paper, which is 7.4 ± 0.2 cm every 180 seconds. While the lowest water absorption capillarity is HVS paper which is 0.5 ± 0.1 cm at the 180th second. Cardstock and buffalo paper have almost the same water absorption value and are higher than HVS paper and match. The absorption speed which is almost the same between cardboard and buffalo paper is due to the fact that both belong to the same type of paper, namely printing paper.
Plastic trash in Indonesia has reached 64 million tons per year. Consequently, a solution is required to decrease synthetic plastic waste. A film based on nata de coco has been made as an alternative to biodegradable plastic material using materials consisting of nata de coco, chitosan, and 1% acetic acid. The nata de coco based film was made by varying the composition of chitosan. The variations of chitosan used were 0.1 gram, 0.2 gram, 0.3 gram, and 0.4 gram. The biodegradation test used the soil burial test method by immersing the sample in the soil and the mixed microbial batch method using effective microorganisms 4/EM4 with an estimated time of 15 days. The results of the soil burial test method showed a variation of 0.1 experienced a weight loss of 100%. Meanwhile, variations of 0.2, 0.3, and 0.4 experienced a weight loss of 60-75%. Meanwhile, the results of the mixed microbial batch method showed that the nata de coco-based film underwent biodegradation as indicated by the tearing of the surface of the nata de coco-based film. From these results, nata de coco-based films can be said to be biodegradable plastics.
Material kemasan makanan yang umum digunakan adalah karton. Karton memiliki beberapa keunggulan diantaranya ringan, murah, mudah dibentuk, mudah dicetak, mudah disimpan dan mudah didaur ulang. Namun material kemasan ini mudah robek jika dibandingkan dengan material lain seperti plastic, kaleng, dan kaca. Laminasi dilakukan untuk meningkatkan nilai ketahanan sobek dari karton, sehingga tidak mudah robek. Jenis karton yang umum digunakan sebagai material kemasan pangan adalah ivory. Ivory yang digunakan sebagai bahan pengujian ini bergramasi 260 gsm dan 310 gsm. Ada tiga jenis perlakuan ivory yang diuji yakni ivory non laminasi dan ivory laminasi doff, dan ivory laminasi glossy. Penelitian ini bertujuan untuk menganalisis perbandingan nilai ketahanan sobek ivory laminasi dan non laminasi. Metode yang digunakan dalam pengujian adalah ISO 534:2011, ISO 536:2010, dan ISO 1974:2012. Hasil penelitian menunjukkan bahwa peningkatan nilai ketahanan sobek karton ivory laminasi doff sebesar 22%-24% dan untuk laminasi glossy meningkat 24%-26%.
The color deviation that occurs during the printing process is one of the problems often encountered in the graphics. This is very detrimental in terms of cost, time and energy. To know the color deviation, you can measure the L*a*b* value of the print. The offset printing process is used in this deviation analysis of L*a*b* value. When the technical specifications relate to paper, ink, machines, techkon measuring instruments and milk packaging products The machine used is the Heidelberg Speedmaster machine where there are four stages of operation, namely the preparation of machine, machine setting, ACC color and production in many quantities. The instrument used to measure the deviation of L*a*b* value or ΔE value of the milk packaging is Techkon. The value of L*a*b* for special colors as a reference is taken from the color gamut, i.e. at minimum L*: 20.21, a*: 7.09, b*: -40.19, standard L*: 18.69, a*: 9.77, b*: -42.63, maximum L *: 18.41, a*: 11.16, b*: -43.65, and the maximum value of ΔE* ab is 2.50. The factors that cause deviation are the thickness of the ink layer and the color reflection from the paper surface. Giving an ink layer less / thin, the resulting color tends to match the reflection of the paper surface, giving a thicker ink layer can cause the print to set off and the color to deviate from the color range.Keywords— Deviation, L*a*b* value, Milk Packaging
Pemanfaatan teknologi pembelajaran jarak jauh (e-learning) perlu disiasati agar tujuan pembelajaran dapat tercapai secara efektif meskipun kegiatan tidak dilakukan secara tatap muka langsung di dalam kelas. Salah satu cara meningkatkan fokus d an minat peserta didik dalam kegiatan pembelajaran adalah pemanfaatan elemen yang ada dalam game pada media pembelajaran e-learning atau disebut juga dengan istilah gamifikasi. Platform gamifikasi kebanyakan memiliki lisensi ataupun berbayar sehingga Guru harus mengeluarkan biaya ekstra. Solusi atas permasalahan tersebut adalah diadakan pelatihan dan pendampingan penggunaan platform gamifikasi dalam jaringan kepada para Guru dimana aplikasi tersebut tidak berbayar dan sederhana dalam penggunaannya. Tujuan dari kegiatan pengabdian masyarakat ini adalah mengenalkan dan meningkatkan kompetensi digital Guru dan Pendidik dalam menggunakan platform gamifikasi daring (dalam jaringan) sebagai media pembelajaran. Metode yang digunakan dalam kegiatan pengabdian adalah metode pelatihan dan pendampingan. Hasil kegiatan pengabdian kepada masyarakat ini berupa tahapan pembuatan media pembelajaran menggunakan platform gamifikasi wordwall.net, yaitu membuka laman wordwall.net, memilih Sign Up, mengatur tampilan myActivities, membuat Maze Chase, dan mengevaluasi/melihat hasil kerja siswa. Kesimpulan kegiatan ini adalah adalah meningkatnya keterampilan digital peserta kegiatan, Produk media pembelajaran berbasis game dan kuis, serta buku panduan praktis penggunaan platform gamifikasi. Materi yang disampaikan bermanfaat bagi para Guru dan Pendidik dalam mempersiapkan bahan ajar digital berbasis game dan kuis.
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