Prolonged Storage of Lemons Using Individual Seal-packaging

`Eureka' lemons [Citrus limon (L.) Burro. f.] treated for commercial storage were held for 6 months at 13C. One-half of the fruits were individually sealed in high-density polyethylene (HDPE) plastic film and half not sealed. The HDPE-seaIed lemons showed little change in the water relations characteristics, while unsealed lemons lost weight and decreased in water potential throughout the storage period. The maturity indices in the two treatments were generally similar during the first 3 months of storage, after which maturation of wrapped fruit was slower than that of the control. The overall marketable quality of the fruit was higher in HDPE-sealed lemons than in unsealed. From these results, it appears feasible to introduce seal packaging in packing lines where lemons will be placed in extended storage.

Download Full-text

Effects of low density polyethylene liners and high-density polyethylene wraps on quality, decay and storage life of lemon and tangor fruits

Australian Journal of Experimental Agriculture ◽

10.1071/ea9850718 ◽

1985 ◽

Vol 25 (3) ◽

pp. 718 ◽

Cited By ~ 1

Author(s):

PJ Sharkey ◽

CR Little ◽

IR Thornton

Keyword(s):

High Density Polyethylene ◽

Citrus Sinensis ◽

Storage Life ◽

High Density ◽

Low Density Polyethylene ◽

Citrus Limon ◽

Citrus Reticulata ◽

Low Density ◽

Cool Storage ◽

And Storage

Winter-maturing Lisbon lemons (Citrus limon (L.) Burm.f.) and Ellendale tangors (Citrus reticulata x Citrus sinensis (L.) Osbeck) which had been dipped in fungicides and waxed, developed less than 10% rot but remained fresh for only 2-3 months in cool-storage at 10�C and 80-90% RH. High-density polyethylene (HDPE) wraps delayed loss of firmness and peel coloration of tangors and lemons for 5 and 8 months respectively, in cool-storage, but both citrus developed unacceptable levels of rotting within 4 months of harvest. Perforated low-density polyethylene liners were less effective than HDPE wraps for preserving fruit condition but they extended the storage life of lemons until early January (6 months) without incurring levels of decay greater than 10%. However, tangors cool-stored in liners became unsaleable after only 3-4 months owing to loss of acidity and flavour.

Download Full-text

Application of Nondestructive Testing in Quality Controlling of High-Density Polyethylene Silicore Plastic Duct

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.470.693 ◽

2013 ◽

Vol 470 ◽

pp. 693-696

Author(s):

Bai Yan Gong ◽

Yu Hong Lu ◽

Juan Ren

Keyword(s):

Nondestructive Testing ◽

Product Quality ◽

High Density Polyethylene ◽

High Density ◽

Important Indicator ◽

Breaking Elongation ◽

Sampling Inspection ◽

Weight Impact ◽

Falling Weight

Some key quality problems has been exposed in several years of quality supervision sampling inspection of industry products for HDPE silicore plastic duct, such as dimension, breaking elongation, performance of falling weight impact and ring stiffness. Quality consistency is an important indicator in evaluating product quality. Nondestructive testing can be used to evaluate the quality of the whole pan and batch of silicore plastic duct, and it will play important role in product quality controlling.

Download Full-text

Effect of thawing on the quality of frozen mechanically deboned meat

Agricultural and Food Science ◽

10.23986/afsci.72914 ◽

1990 ◽

Vol 62 (5) ◽

pp. 407-415

Author(s):

L. Riihonen ◽

P. Linko

Keyword(s):

High Density Polyethylene ◽

High Density ◽

Quality Product

The effect of thawing conditions on the quality of mechanically deboned beef (MDB) and mechanically deboned pork (MDP) recovered using a pressure-based Inject Star deboner was investigated. Samples were recovered using a freshly disinfected machine, and immediately packed in 3 kg portions in high density polyethylene (HDPE)-coated cartons or in Cryovac vacuum bags. Three methods of thawing were used: microwave thawing and thawing at +4°C and at +21°C. All samples were analysed chemically and microbiologically immediately after thawing. Microwave thawing resulted in a better quality product (P

Download Full-text

Can Edible Coatings Maintain Sweet Pepper Quality after Prolonged Storage at Sub-Optimal Temperatures?

Horticulturae ◽

10.3390/horticulturae7100387 ◽

2021 ◽

Vol 7 (10) ◽

pp. 387

Author(s):

Shani Kehila ◽

Sharon Alkalai-Tuvia ◽

Daniel Chalupovicz ◽

Elena Poverenov ◽

Elazar Fallik

Keyword(s):

Storage Temperature ◽

Gas Permeability ◽

Chilling Injury ◽

Storage Period ◽

Co2 Production ◽

Prolonged Storage ◽

Layer By Layer ◽

Fruit Storage ◽

Chitosan Coating

This work evaluated the efficacies of different coatings: chitosan, gelatin and chitosan-gelatin applied layer-by-layer (LbL); for maintaining the quality of sweet peppers that were stored for 3 weeks at a sub-optimal temperature (1.5 °C) and at an optimal storage temperature (7 °C). After the cold-storage period, fruits were kept under marketing conditions (21 °C) for 3 more days. An edible chitosan coating (2%) effectively alleviated chilling injury and the incidence of decay, and also preserved the nutritional quality of sweet peppers that were kept for 3 weeks at 1.5 °C plus 3 more days at 21 °C. The chitosan coating was more effective than the two other coatings. All three coating treatments significantly reduced external CO2 production, as compared to uncoated control fruit. Storage temperatures did not significantly affect external CO2 production, although CO2 production was slightly higher at 1.5 °C. The chitosan coating exhibited good CO2 gas permeability properties and the peppers coated with that material had lower respiration rates than those in the other two experimental treatments or the control. From a practical point of view, chitosan coating could replace the plastic bags previously found to alleviate chilling injury in peppers that are stored at 1.5 °C as a quarantine treatment.

Download Full-text

Modelling of stresses and strains in two-layer combined materials at their formation

Archives of Materials Science and Engineering ◽

10.5604/01.3001.0013.2866 ◽

2019 ◽

Vol 1-2 (97) ◽

pp. 12-19

Author(s):

G.M. Koloskova

Keyword(s):

High Density Polyethylene ◽

Bottom Layer ◽

High Density ◽

Bottom Plate ◽

Distribution Dynamics ◽

Polymer Metal ◽

First Time ◽

Practical Implications

Purpose: The aim of the represented study was to model the behaviour of two-layer combined material during its manufacturing. Design/methodology/approach: The model of material layers joining by means of calender method is built in LS-DYNA software on the basis of finite element method. Using the developed model the study of stress and strain condition changes is carried out. Numerical modelling was carried out for two types of two-layer combined materials in similar conditions. First combination was of high-density polyethylene top layer and aluminium foil bottom layer. Second combination was of high-density polyethylene top layer and low- density polyethylene bottom layer. Joining materials had equal thicknesses. Findings: During formation of two-layer combined materials the primary strain always occurs at the bottom plate of the bottom layer. However, the maximum plastic strain will be represented for the layer with lower elastic modulus value. At the point of the highest loading applied to the two-layer combined material the elasticity condition is changed to the plasticity one and the yield process is registered. Practical implications: Multi-layer combined materials are some of the most advanced types of materials. The quality of the joining of the layers, the strains and the stresses arising in their manufacturing process are the main causes of low interlayer strength. It leads to easy exfoliation and destruction of the material. The results of the study may be used to improve the quality of multi-layer combined materials. Originality/value: For the first time the model was developed for the determination of strains and stresses arising during the formation of multi-layer combined materials by means of calendering method. The calculations of the stresses and strains distribution dynamics for two-layer combined materials are represented for polymer-metal and polymer-polymer layers combinations. The results of the study may be of interest to specialists in the field of multi-layer combined materials designing and manufacturing.

Download Full-text

Peningkatan Mutu Briket dari Sampah Organik dengan Penambahan Minyak Jelantah dan Plastik High Density Polyethylene (HDPE)

Jurnal Kimia VALENSI ◽

10.15408/jkv.v0i0.3567 ◽

2015 ◽

pp. 91-96

Author(s):

Silvia Septhiani ◽

Eka Septiani

Keyword(s):

Natural Resources ◽

High Density Polyethylene ◽

Alternative Fuel ◽

High Density ◽

Cooking Oil

The objective of this research was to looking for the alternative fuel to overcome the limitations of natural resources by using organic garbage and to investigate the improvement quality of biobriket after HDPE and cooking oil addition. Making biobriket with carbonitation organic garbage was a method that is used. The result of the research suggests that the quality of biobriket increased after HDPE and cooking oil addition. The analysis of water biobriket showed that HDPE was decreased from 13.99% to 13.88% and biobriket of cooking oil is 9.39%. More over the decreasing also happened to the content of the ash, from 25% to 23% biobriket HDPE and 20% to biobriket of cooking oil. Calorific biobriket 4703.27 cal/g, the increasing of HDPE biobriket was 5009.16 cal/g and biobriket of cooking oil 6245.66 cal/g. DOI :http://dx.doi.org/10.15408/jkv.v0i0.3567.

Download Full-text

Application of Oxalic Acid and 1-Methylcyclopropane (1-Mcp) with Low and High-Density Polyethylene on Post-Harvest Storage of Litchi Fruit

Sustainability ◽

10.3390/su13073703 ◽

2021 ◽

Vol 13 (7) ◽

pp. 3703

Author(s):

Md. Saddam Hossain ◽

Karna Ramachandraiah ◽

Rashidul Hasan ◽

Rabiul Islam Chowdhury ◽

Kawser Alam Kanan ◽

...

Keyword(s):

Oxalic Acid ◽

High Density Polyethylene ◽

Combined Treatment ◽

Storage Period ◽

High Density ◽

Total Phenol ◽

Anthocyanin Content ◽

Flavonoid Content ◽

Post Harvest ◽

Red Pericarp

The present study investigates the effects of oxalic acid and 1-methylcyclopropane (1-MCP) treatments in combination with low-density polyethylene (LDPE) and high-density polyethylene (HDPE) on the post-harvest storage of litchi fruits. The physicochemical properties, bioactive compounds, antioxidant activities, and dismutase enzyme activity (SOD) of treated and untreated litchi fruits were examined during 30 days of storage at 4 ℃. The most effective combination was 1-MCP and HDPE packaging, which lowered the weight loss and preserved the red pericarp. Fruits treated with 1-MCP and HDPE also exhibited higher content of ascorbic acid (74.73–34.95 mg/100 g), total phenol (55.70–28.83 mg/100 g), and total flavonoid content (82.46–48.54 mg/100 g), whereas anthocyanin content (0.24–0.39 mg/100 g) was lowered during the entire storage period. In addition, higher levels of DPPH activity, reducing power, and SOD activity were observed in 1-MCP and HDPE-treated fruits. While antioxidants, SOD activities, and acidity were positively associated with total phenol and flavonoid content, these were negatively associated with anthocyanin content. Thus, the combined treatment of 1-MCP and HDPE are proposed as a sustainable strategy to preserve red pericarp, improve quality, and increase fruit shelf life of litchi.

Download Full-text

Dielectric Properties and Relaxation Behavior of High Density Polyethylene (HDPE)

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.799-800.1319 ◽

2015 ◽

Vol 799-800 ◽

pp. 1319-1324

Author(s):

F. Benabed ◽

Tahar Seghier

Keyword(s):

Dielectric Properties ◽

Dielectric Response ◽

High Density Polyethylene ◽

Chemical Structure ◽

High Density ◽

Dielectric Relaxation Spectroscopy ◽

Dielectric Studies ◽

Frequency Range ◽

Wide Range

The method of dielectric spectroscopy is an instrument of choice for the diagnosis of insulation used in high voltage and also to assess the quality of the insulation of HV equipment such as transformers, cables, capacitors, etc...This method allows to estimating the state and the quality of the insulation using the dielectric response of the frequency range. In this article, we have presented results of dielectric studies in high-density polyethylene (HDPE) by means of dielectric relaxation spectroscopy (DRS) in frequency range 10-2 - 106 Hz and temperature between-60 and 60 °C, we will invest this method to measure the dielectric properties and evaluate the performance of this insulator witch has always been chosen as a model polymer material because it is the simplest polymer with respect to its chemical structure and is used in a wide range of applications in daily life.

Download Full-text

Optimization of ultrasonically welded High density polyethylene with Medium density polyethylene

10.21203/rs.3.rs-615324/v1 ◽

2021 ◽

Author(s):

Vignesh Asokan ◽

Venkat Prasanna

Keyword(s):

Mechanical System ◽

High Density Polyethylene ◽

Hold Time ◽

Ultrasonic Welding ◽

High Density ◽

Medium Density ◽

Acoustic Vibrations ◽

Strong State ◽

Weld Time

Abstract Ultrasonic welding is a mechanical system whereby high-recurrence ultrasonic acoustic vibrations are privately connected to workpieces being held together compelled to make a strong state weld. It is usually utilized for plastics, and particularly for joining disparate materials. The point of the undertaking is to examine the quality of weld when unique materials are welded together. The sort of weld will rely upon an on-hold time, weld time, weight, and recurrence. Materials utilized will be HDPE (High Density Polyethylene) and a blend of HDPE-LDPE which is termed as MDPE (Medium density polyethylene). Diverse materials have distinctive properties and thus making a joint with wanted properties will give a better outcome. If one material has properties like better elasticity, pressure quality and other material have properties like pliability and flexibility and so forth then the blend of these materials will have properties of both the materials and when these kinds of materials are welded ultrasonically, they give a better outcome. Subsequently we will get a material which will give better quality with ease. Likewise, the material will be increasingly adaptable.

Download Full-text

PENGGUNAAN FILM PLASTIK UNTUK KEMASAN KELAPA KOPYOR

Jurnal Penelitian Tanaman Industri ◽

10.21082/jlittri.v21n2.2015.99-107 ◽

2020 ◽

Vol 21 (2) ◽

pp. 99

Author(s):

MUHAMMAD YUSUF ANTU ◽

ROKHANI HASBULLAH ◽

USMAN AHMAD

Keyword(s):

Fatty Acids ◽

High Density Polyethylene ◽

Storage Temperature ◽

Color Change ◽

Thiobarbituric Acid ◽

Quality Parameters ◽

High Density ◽

Cool Temperature ◽

Plastic Film ◽

Fat Hydrolysis

ABSTRAKKelapa kopyor memiliki kandungan gizi yang penting, seperti karbohidrat, protein, lemak, dan asam lemak. Selama penyimpanan kelapa kopyor mudah mengalami kerusakan karena proses oksidasi dan hidrolisis lemak. Hal ini menyebabkan kelapa kopyor mengalami ketengikan dan perubahan warna dari putih menjadi kuning kecoklatan. Untuk mengatasi hal tersebut, dilakukan pengemasan dengan film plastik dan menyimpannya pada suhu dingin. Tujuan penelitian adalah untuk Memberikan informasi mengenai keefektifan film plastik untuk penyimpanan daging kelapa kopyor. Bahan penelitian adalah kelapa kopyor dari Kalianda (Lampung Selatan). Kelapa kopyor dikemas film plastik jenis Polyamide (PA), Polypropylene (PP), dan High Density Polyethylene (HDPE). Arameter mutu yang dianalisis adalah Thiobarbituric acid (TBA), asam lemak bebas (ALB), total padatan terlarut (TPT), pH, total mikrob, kadar lemak, serta uji organoleptik warna, aroma, dan rasa. Penelitian menggunakan Rancangan Acak Lengkap dengan dua faktor. Faktor pertama adalah film plastik dengan tiga taraf (PA, PP, HDPE), dan faktor kedua adalah suhu dengan dua taraf (5 ± 2 dan 10 ± 2 oC). Hasil penelitian menunjukkan jenis film plastik PA pada penyimpanan suhu 5 ± 2 oC merupakan kemasan yang efektif dalam mempertahankan mutu kelapa kopyor hingga enam hari, yang dibuktikan dengan rendahnya total mikrob, TBA, dan ALB. Selain itu, panelis masih menyukai kelapa kopyor dari warna, aroma dan rasa.Kata kunci: kelapa kopyor, plastik film, mutu, suhu, waktu penyimpanan The Usage of Plastic Film for Kopyor Coconut Packaging ABSTRACTKopyor coconut contains important nutrients, such as carbohydrates, protein, fat, and fatty acids. During storage kopyor coconut is easily suffered damage, because of oxidizing and fat hydrolysis processes. The processes cause kopyor coconut suffered rancidity and color change from white to brownish-yellow. Packaging kopyor coconut with plastic film and keep it in a cool temperature could overcome this problem. The aim of the research was to provide information the effectiveness of plastic films for kopyor coconut storage. Research material was kopyor coconut obtained from Kalianda (South Lampung). Kopyor coconut packaged in plastic film type Polyamide (PA), Polypropylene (PP), and High Density Polyethylene (HDPE). The quality parameters observed were Thiobarbituric acid (TBA), free fatty acids (FFA), pH, total soluble solid (TSS), pH, total microbes, fat content, and sensory characteristics including color, flavor, and taste. This research used Randomized Complete Design with two factors. The first factor was the packaging material with three different types (PA, PP, HDPE), and the second factor was the storage temperature at two levels of 5 ± 2 and 10 ± 2 oC. The results showed that the type of plastic film packaging PA at storage temperature 5 ± 2 oC is effective in maintaining the quality of kopyor coconut up to six days, as evidenced bythe low total microbe, TBA, and ALB. In addition, panelists still like kopyor coconut of color aroma and taste.

Download Full-text