OPP Film Research Articles

Full-color Window Display Using Birefringence Colors by OPP Films Which Enable to Make Images Invisible from Back Side

Full-color Window Display Using Birefringence Colors by OPP Films Which Enable to Make Images Invisible from Back Side

Microbiota Assessment of Fresh-Cut Apples Packaged in Two Different Films.

The aim of this work was to assess the natural microbiota of packed fresh-cut apples during refrigerated storage. Two different films were tested for the package, a biodegradable (PLA) film and a conventional and commercial one (OPP). Two antioxidant additives were applied, a natural olive pomace extract and the commercial ascorbic acid used by the industries. The results revealed lower bacteria counts in samples with olive pomace extract and PLA films than in those with ascorbic acid and OPP films after 5 and 12 days of storage. These findings suggest that the use of such natural extracts as additives in fruits could delay the growth of mesophilic bacteria. The characterization and identification of the bacterial isolates from fresh-cut apple samples showed that the most prevalent species were Citrobacter freundii, Staphylococcus warneri, Pseudomonas oryzihabitans, Alcalinogenes faecalis, Corynebacterium jeikeium, Micrococcus spp., Pantoea aglomerans and Bacillus spp. Furthermore, an increase in the microbial diversity during the storage time at refrigerated temperatures was observed, except for the sample treated with olive pomace extract and packaged in OPP film. The highest microbial diversity was found for samples with ascorbic acid as an additive. This could indicate a negative effect of ascorbic acid on the microbial inhibition of apple slices. The natural olive pomace extract demonstrated potential as an antimicrobial additive for fresh-cut apples.

Influence of modified atmosphere packaging on post-harvest physiology, overall quality, and bioactive compounds during cold storage and shelf-life of 'Tondo Nero' figs (Ficus carica L.)

The impact of four polymers [(a) oriented polypropylene film (OPP); b) polyolefin heat-shrinkable film (BOLPH), c) micro-perforated OPP film (MICRO); and d) macro-perforated OPP film (MACRO)] was tested on ‘Tondo Nero’ figs, cold stored at 1 °C for 7 or 14 d (CS) plus 3 d at 20 °C in simulate marketing conditions (SMC). In-package ethylene increased as film permeability decreased, peaking in OPP-packages. CO2 partial pressure of OPP-packages, peaking at 15 kPa in CS conditions and at about 30 kPa at the end of SMC, and O2 partial pressure tending to 0 kPa, negatively affected the overall acceptability. In-package CO2, never exceeding 8 kPa, and O2, never dropping 12 kPa, of MICRO and MACRO films did not affect fructose and glucose concentration, but reduced the loss of phenolic compounds, ascorbic acid and antioxidant activity of the peel as well as of the pulp, showing a better performance compared to the other films.

Active tensegrity structures using electrostatic actuators

Tensegrity structures have been applied to soft robots because of their light weight, mechanical stability, and flexibility. Many tensegrity robots developed in other research have been driven by motors. However, there are concerns that the use of motors may lead to problems such as increased weight, increased structural complexity, and reduced flexibility. In this study, we propose the integration of a type of smart material, hydraulically amplified self-healing electrostatic actuators (HASEL actuators), into tensegrity structures. The use of HASEL actuators as cables for tensegrity is expected to simplify the structure, reduce weight, and improve flexibility. In this paper, we fabricated and characterized a tensegrity structure consisting of three rods and four HASEL actuators to demonstrate the proof-of-concept of a tensegrity structure integrating HASEL actuators. OPP film was used for the shell, Fluorinert (FC40, 3M) was used for the liquid dielectric, and conductive double-sided tape (CN4490, 3M) was used for the electrodes of HASEL actuators. The rods were fabricated by a 3D printer (Form3, Formlabs). Four Hasel actuators were subjected to a voltage and the change in tensegrity structure was determined. It was confirmed that the higher the applied voltage, the smaller the tensegrity structure. The experimental results indicate that the tensegrity structure integrated with the HASEL actuators is actuated, and the concept proposed in this study is proven. Further analysis of the characteristics and optimization of the tensegrity structure will be the focus of future work.

Influence of Printing Substrate on Quality of Line and Text Reproduction in Flexography

This study characterizes and compares the parameters of the quality reproduction of fine elements in flexography on coated and uncoated paper as well as on OPP film (oriented polypropylene). A monochrome test form was created and printed using cyan UV ink. The analysis of results confirms the importance of interaction between the printing substrate and ink; it also indicates identical line and text deformations on the print. Quality reproduction on coated paper is higher in relation to OPP film for all the research parameters. The ink penetrates significantly more and with more irregularity into the pores and throats of the uncoated paper, which results in less homogeneous elements, and in such way that it loses its original shape. In coated paper and OPP film, the ink spreads more on the substrate area which gives it a significantly more homogeneous shape. However, due to the surface spread of the ink, the biggest changes in the size of fine elements are noticeable in the OPP film. The scientific contribution of this paper is based on the comparison of print quality parameters of fine elements, which can contribute to the optimization of the production process and quality of the final graphical product.

Water vapor transmission rate of polymer hybrid latex poly-(St-co-BA-co-MMA) synthesized via miniemulsion polymerization technique with montmorillonite as filler

Nanocomposites based on poly-(St-co-BA-co-MMA) and organo-montmorillonite (OMMT) were synthesized through miniemulsion polymerization. OMMT was used as filler after modification with cetyltrimethylammonium bromide (CTAB) through ion exchange method. The results were characterized with x-ray diffraction (XRD) and Fourier-transform infrared (FTIR) spectrophotometer. Unmodified MMT showed a diffraction peak at 2θ = 7.2° with interlayer spacing of 12.78 Å, shifting to lower angle of 2θ = 4.7° with interlayer spacing increased to 22.31 Å formed pseudotrilayer or paraffin structure. FTIR confirmed the XRD results with the presence of new peaks on modified MMT, indicated the amine groups have inserted into MMT layers. Miniemulsion polymerization with OMMT level up to 8.0 wt% was performed well with less coagulum in the latex; scaling up to higher level of OMMT (>10 wt%) affected instability in polymerization system, created high amount of coagulum and increased the latex Broekfield Viscosity from 150 cPs to 528 cPs. Water vapor transmission rate (WVTR) of latex with 8.0 wt% OMMT level was compatible to LDPE and PET films but still unable to compete with OPP film.

The Impact of Printing Substrate on Dot Deformation in Flexography

This study characterizes and compares the dot properties in flexography on coated and uncoated paper and on OPP film, with the use of conventional AM screening technology and photopolymer plate with flat top dots. A monochrome test form was created and printed with cyan ink on three different printing substrates. For the study of the dot deformation, microscopic images were taken from the prints and analyzed using ImageJ software. The primary area of the study are highlight tones since the reproduction of small dots is synonymous with high quality reproduction. All significant parameters of the dot deformation were evaluated, including the dot geometry, dot sharpness and uniformity of density. The image analysis showed that dot deformation is the result of spreading and penetration of the ink. The microscopic snapshots of the test areas on the prints show that ink penetrates significantly into the pores and holes of the uncoated paper, resulting in a non-homogeneous dot, thus losing its original shape. On coated paper and OPP film, the ink spreads more on the surface of the printing substrate and in such way gives a more homogeneous dot shape.

Evaluation of novel bitter cassava film for equilibrium modified atmosphere packaging of cherry tomatoes

Equilibrium modified atmosphere packaging (EMAP) technology offers the possibility to maintain produce postharvest quality and extend its shelf-life. However, EMAP stability depends on well-tuned packaging design parameters to match environment conditions. This study defined design requirements of a biobased film EMAP that can preserve quality and prolong shelf-life of fresh cherry tomatoes under recommended and simulated abuse supply chain conditions. Optimum EMAP was evaluated based on headspace gas composition at 10–20 °C, 75–95% RH and verified by determining quality changes of packed cherry tomatoes in using a continuous or micro-perforated (0.27 μm) bio-based intact bitter cassava (IBC) film. This was compared with a non-bio-based polymer film (oriented polypropylene, OPP). The IBC film attained equilibrium O2 (2–3%) after 180 h at 10 °C, with 0 and 1 perforation, for 75 and 95% RH while OPP film maintained a downward O2 fall. Continuous and micro-perforated IBC film did not show any major differences in equilibrium headspace O2, thus perforation can be neglected. Based on desirability optimisation results, biobased IBC film demonstrated better optimized EMAP system in attaining recommended gas and stretching cherry tomato shelf-life as compared to non-biobased (OPP) film. The application of bio-based IBC film offers new possibilities in packaging fresh produce under equilibrium modified atmosphere without compromising their quality.

Photochromic properties of spiropyran in epoxy resin as anti-counterfeiting coating on flexible materials

A kind of spiropyran derivatives, 1-chloro-3-(3′,3′-dimethyl-6-nitrospiro[chromene-2,2′-indolin]-1′-yl)propan-2-ol (CSP), was synthesized and characterized by FT-IR, 1H NMR, EI-MS, which contained the spiropyran moiety. The photochromism and solvatochromism in the diverse solvents were investigated in details. The polarity of the solvent played a crucial effect on the absorbance of the ring open form (MC) for CSP, characterized by using the relative polarity and Reichardt's empirical solvent polarity parameter (ET(30)). The fatigue resistance was evaluated by the number of cycles required to reduce the initial absorbance at λmax by 50% (Z50). Entrapment of the radical-scavengers such as butylated hydroxyl toluene (BHT) and 2,2,6,6-tetramethyl-piperidine-1-oxyl (TEMPO) practically enhanced the duration of CSP and protected most of the molecules from further oxidation in acetone. The parameter Z50 in ethyl acetate was 534 and was much higher than the others. However, it reached to more than 1200 when CSP was doping in the epoxy resin on OPP film. It indicated that the CSP could be applied in the flexible substrate for foods and medicine package.

Heat treatment and active packaging to improve the storage of fresh-cut melons (Cucumis meloL.)

Introduction. Melon (Cucumis melo L.) is highly appreciated by consumers due to its sensory attributes and nutritional content. Producing minimally processed fruit has potential, because consumers look for freshness and convenience. However, fresh-cut processing increases the contact enzymes and their respective substrates because the cell tissue rupture, and this causes browning, softening and decay. This study investigated the effect of a combination of heat treatment with active modified atmosphere packaging on the quality of fresh-cut melons. Materials and methods. Whole ‘Charentais’ melon fruits were dipped in hot water (at 50 °C for 30 min), cooled, minimally processed and packaged in traditional polymeric film (oriented polypropylene, OPP) or biodegradable film (polylactic acid, PLA) with an initial flush of a gas mixture composed of 2−3% O2 and 7−8% CO2 . The quality of the fresh-cut melons was monitored for 11 days after treatment. Results and discussion. Gas changes demonstrated that (i) PLA permeability was higher than OPP permeability, and (ii) the heat treatment could temporarily reduce the respiration rate of fresh-cut melons. Heat treatment as a stress could also increase the beta-carotene content. Conclusion. The combination of heat treatment and active MAP with OPP film significantly improved both the decay development and the visual quality of fresh-cut melons for up to 11 days.

Design of biodegradable bio-based equilibrium modified atmosphere packaging (EMAP) for fresh fruits and vegetables by using micro-perforated poly-lactic acid (PLA) films

Equilibrium modified atmosphere packaging (EMAP) is used for prolonging the shelf life of fresh produce such as fruits and vegetables and preserving their quality characteristics such as freshness, colour and aroma. However, the resulting extensive use of plastic packaging films raises serious environmental concerns. Replacing conventional plastic films with novel biobased and biodegradable under composting conditions materials such as films made of poly-lactic acid (PLA), offers new sustainable solutions to the problem. In the present work, the gas transport properties of three layer PLA films have been studied in relation to their potential as EMA packaging materials for fresh produce. A simple one-dimensional model simulating the combined gas diffusion through micro-perforations and the permeable membrane was developed as a designing tool for PLA based EMA packaging systems. By using this model, innovative biodegradable bio-based EMAP systems were designed specifically for selected fruits and vegetables using laser microperforated, water vapour (WV) permeable PLA films. It was shown that the relatively high water vapour permeability of PLA films compared to conventional OPP films allows the development of an optimised biodegradable bio-based EMA packaging for the specific applications.

Argon gas 병용처리가 신선편이 감자의 품질에 미치는 영향

The effect of the combined argon (Ar) gas packaging treatment on the browning of fresh-cut potatoes was studied. Fresh-cut potatoes were prepared for the following six groups: dipping distilled water for 1 minute and air packaging (Cont); dipping in distilled water for 1 minute and argon gas packaging (AR); dipping in 1% ascorbic acid for 1 minute and air packaging (AA); dipping in 1% ascorbic acid for 1 minute and argon gas packaging (AAR); blanching at 35℃ for 30 minutes and air packaging (BL); and blanching at 35℃ for 30 minutes and argon gas packaging (BAR). The potatoes were washed, peeled, and sliced (1.5×1.5×1.5 cm) before treatment. The samples were packed with a 0.04-mm-thick OPP film and were stored at 5℃ for 9 days. During the storage, the O2 concentration decreased in Cont but increased in the AR, AA, AAR, BL, and BAR groups. The CO2 concentration increased during storage. The AR, AAR, and BAR groups showed high L* and low a*, b* values (browning index). The growth of the total aerobic bacteria was also inhibited in the AR group. During storage, the PPO activity gradually increased, and the AR group showed lower PPO activity. The AA and AAR groups showed high DPPH radical scavenging activity. It was demonstrated that the argon gas packaging is effective in the quality maintenance of fresh-cut potatoes.

Phytoncide 처리가 신선편이 양상추의 저장 중 이화학적, 미생물학적 및 관능적 특성에 미치는 영향

본 연구는 솔잎 유래의 phytoncide essential oil을 증류수에 희석한 것(1%, v/v, DP)과 식용 에탄올에 희석한 것(1%, v/v, EP), 증류수(DW) 및 식용 에탄올(EE)을 침지액으로 이용하였다. pH는 DW 처리구에서 가장 높고 EP 처리구에서 가장 낮았으며, 증류수보다는 에탄올 포함 처리구에서, 대조구보다는 phytoncide 성분이 포함된 처리구에서 낮은 pH인 것으로 나타났다. 적정산도는 EP 처리구가 가장 높고, DW 처리구가 가장 낮은 것으로 나타나 pH의 결과와 잘 일치하는 경향이었다. 총 가용성 고형분 함량은 1.60~2.23의 범위로, 에탄올이 포함된 EE 및 EP 처리구에서 유의적으로 높은 함량으로 나타났으며, 포장필름 내 기체조성 분석결과, EP 처리구가 modified atmosphere packaging (MAP)의 원리인 저산소 및 고이산화탄소 조건인 것으로 나타났다. 관능검사 결과, 외관, 색 및 갈변 정도에서 EP 처리구가 유의적으로 높은 점수를 얻었으며, DW 처리구가 가장 낮은 점수를 얻어 갈변 저해에 뛰어난 효과가 있음을 알 수 있었다. 총균수는 저장 중 꾸준히 증가하는 경향이었으며, EP 처리구가 가장 완만한 증가율을 보여 항갈변뿐만 아니라 항균에도 효과가 있음을 확인할 수 있었다. 이러한 결과들로 보아 EP 처리구는 갈변 저해 및 항균에도 효과가 뛰어나 품질 유지에 긍정적인 영향을 미치므로, 고품질 신선편이 양상추의 가공 및 유통에 있어 효과적인 방법으로 이용될 수 있을 것이라 기대된다. The effect of phytoncide solution treatment on the browning and quality of fresh-cut iceberg lettuce during storage was studied. The treatments were applied as four solutions adjusted at <TEX>$10^{\circ}C$</TEX>: distilled water (DW) as the control; edible ethanol (EE); 1% (v/v) phytoncide essential oil from pine needle diluted with distilled water (DP); and 1% (v/v) phytoncide essential oil diluted with edible ethanol (EP). Fresh-cut lettuce was dipped in each solution for 60 sec, was rinsed with distilled water, was packaged with an OPP film bag, and was then stored at <TEX>$4^{\circ}C$</TEX> for 12 days. The EP group had a significantly high level of total soluble solids, titratable acidity, and carbon dioxide, and low total bacteria counts, pH, and oxygen. The sensory score of color in the EP group recorded a high value, but the EE and EP groups recorded low scores in aroma and taste during the storage period. Alcohol and phytoncide were vaporized by opening the package for two hours, and the score of the aroma and taste of EP showed no differences from those of the other groups. Based on the above results, it was determined that the phytoncide essential oil diluted in edible alcohol with 1% solution inhibited the browning of and microbial growth in fresh-cut lettuce, and will be a useful natural compound in maintaining the quality of fresh-cut produce.

저장 중 무화과(Ficus carica L) 선도유지를 위한 고농도 이산화탄소 처리된 포장 시스템 적용 연구

This experiment was conducted to establish the optimum conditions for high gas treatment in combination with a proper gas-permeable packaging film to maintain the quality of fig fruit (Ficus carica L). Among the fig fruits with different high treatments, the quality change was most effectively controlled during storage in the 70%--treated fig fruit. Harvested fig fruit was packaged using microperforated oriented polypropylene (MP) film to maintain the optimum gas concentrations in the headspace of packaging for the modified-atmosphere system. MP film had an oxygen transmission rate of about /day/atm at . The weight loss, firmness, soluble-solid content (SSC), acidity (pH), skin color (Hunter L, a, b), and decay ratio of the fig fruits were monitored during storage at 5 and . The results of this study showed that the OPP film, OPP film + 70% , and MP film+70% were highly effective in reducing the loss rate, firmness and decay occurrence rate of fig fruits that were packaged with them during storage. In the case of using treatments with packages of OPP film and OPP film+70% , however, adverse effects like package bursting or physiological injury of the fig may occur due to the gas pressure or long exposure to . Therefore, the results indicated that MP film containing 70% can be used as an effective treatment to extend the freshness of fig fruits for storage at a proper low temperature.

Barrier property and penetration traces in packaging films against Plodia interpunctella (Hübner) larvae and Tribolium castaneum (Herbst) adults

The barrier property of different types of plastic film (with or without pinholes) against two insects, Plodia interpunctella (Hübner) larvae and Tribolium castaneum (Herbst) adults, and the morphology of damage produced in these insects were investigated. Using a penetration apparatus, four types of plastic films varying in thickness were used for insect-penetration tests: casted polypropylene, 20 μm and 25 μm (CPP20 and CPP25); oriented polypropylene, 20 μm and 30 μm (OPP20 and OPP30); linear low-density polyethylene, 40 μm and 50 μm (LLDPE40 and LLDPE50); and polyethylene terephthalate 12 μm and 16 μm (PET12 and PET16). After being fixed and tested in the penetration apparatus, each film was cut into a disc shape and 10 holes (200 μm diameter) were made by a pin. The shape of film damage and the mouthparts of insects were observed using scanning electronic microscopy. Plodia interpunctella larvae could penetrate all films with pinholes, while T. castaneum adults were unable to penetrate any of the films tested, even those with pinholes. The penetration-percentages by P. interpunctella larvae were 38% (LLDPE40), 3% (LLDPE), 53% (CPP20), 37% (CPP25), 63% (OPP20), 43% (OPP30), 83% (PET12) and 63% (PET16). The elongation value, tensile strength and thickness of film were important factors in the penetration test. LLDPE, which has the highest elongation value and the lowest tensile strength value, was the film that best protected against insect penetration. In CPP and LLDPE films, there were many scratches and tears around the holes. In comparison, much less damage was observed around the holes in OPP and PET films. By observing the mouthparts of insects, it was determined that P. interpunctella larvae had sharper mandibles than those of T. castaneum adults.

Quality of minimally processed red chicory (Cichorium intybus L.) evaluated by anthocyanin content, radical scavenging activity, sensory descriptors and microbial indices

SummaryChanges in the quality of minimally processed red chicory (Cichorium intybus L.) were studied during storage in a polyvinyl chloride (PVC) film and in a mono‐oriented polypropylene (OPP) film at 4 °C. The maximum limit of 5 × 107 CFU g−1 for mesophilic aerobic bacterial count was attained after 4 days using the PVC film and after 4.5 days using the OPP film. The loss of fruity aroma occurred after 3 days in the products stored in PVC but not in those stored in OPP. In spite of microbial growth, no off‐odour was perceived by trained panellists. Storage in PVC slightly decreased the contents of cyanidin 3‐O‐malonyl glucoside, total phenolics and antioxidant activity, whereas these parameters increased upon storage in OPP. When red chicory heads subjected to mild stress in the field were minimally processed, OPP packaging decreased the microbial growth with respect to PVC, but antioxidants were degraded in both conditions.

Antagonistic Effect of Lactic Acid Bacteria on Microflora of Shredded Cabbage in High CO2 Modified Atmosphere Packaging

Shredded cabbage was packaged in four types of non-perforated and perforated OPP films with initial 10% CO2. In the perforated OPP film with a O2 permeability of 25,000 mL/m2 per day/atm, CO2 remained at about 10%, O2 decreased to 13%, and the shreds showed the best organoleptic quality after 4 days of storage at 10 °C. The bacteria isolated from the shredded cabbage in the perforated MA package were predominantly Gram-negative rod-forms including Enterobacteriaceae and phytopathogenic bacteria, while only lactic acid bacteria (Leuconostoc citreum) was isolated as Gram-positive bacteria. For biological control of the pathogens, two lactic acid bacteria strains (Leuconostoc mesenteroides subsp. mesenteroides and Pediococcus acidilactici) were selected from bacteriocinogenic 6 strains, based on the growth in culture broth under 5% to 20% CO2 atmospheres. Shredded cabbage was inoculated with these two bacteriocin-producing strains, packaged in 10% CO2 perforated MA packaging, and stored at 10 °C. The growth of coliforms and psychotrophic aerobic bacteria was reduced due to antagonistic effect of lactic acid bacteria and the quality of shreds was not affected detrimentally by the strains. These results indicate that the combination of added bacteriocin-producing lactic acid bacteria and 10% CO2 perforated MAP was useful in biopreservation of shredded cabbage.

Effects of chlorine treatment and packaging on the quality and shelf-life of modified atmosphere (MA) packaged coleslaw mix

The effects of an anti-microbial washing treatment combined with modified atmosphere packaging (MAP) on the quality and storage life of dry coleslaw were determined. The anti-microbial treatment consisted of washing for 5 min with agitation in a chlorine solution (100 ppm available chlorine). The coleslaw mix was packaged within two micro-perforated OPP films, PA-160, and PA-210 and stored at 4 and 8 °C for nine days. Chlorine treatment had large beneficial effects on quality, particularly at 4 °C. It significantly reduced respiration rate, resulting in significantly lower CO 2 and higher O 2 concentrations at both 4 and 8 °C compared with water washed coleslaw. Washing with chlorine was found to significantly improve sensory scores, particularly at 4 °C with better acceptability of appearance, colour and aroma. Microbial loads were significantly reduced by the use of chlorine and these reductions were substantially greater at 4 °C. Chlorine had no effect on tissue pH. Overall, chlorine washing had significant effects on the quality and storage life of MA packaged dry coleslaw mix of the treatments studied, the most effective was chlorine washing combined with storage in PA-160 film at 4 °C.

Physiological and Microbiological Characteristics of Fresh-cut Cucumber Stored in CA/MAP in Relation to High CO2 Atmosphere

Fresh-cut cucumber slices were stored at 10 and 20 °C in high CO2 controlled atmospheres (5%, 10%, and 20%) or in MAP of OPP non-perforated and perforated with 50 micro m pores (P-plus) films. In CA storage, respiration rates and surface yellowing of slices were reduced by high CO2 atmospheres at 10°C, but increased with increasing CO2 levels at 20 °C. Counts of mesophiles, psychrotrophs and coliform group on slices stored at 10 °C were not affected by high CO2, except lactic acid bacteria, which the counts increased when stored in 20% CO2. At 20°C, all bacterial counts were higher with slices in 10% or 20% CO2 than those in air or 5% CO2. For MAP study, the used films were non-perforated OPP films (1170 mL/m2/day/atm, O2 permeability) and P-plus films having high (51000 and 74000 mL/m2/day/atm for storage at 10 and 20 °C, respectively) and low (17000 and 51000 mL/m2/day/atm for storage at 10 and 20 °C, respectively) O2 permeability. Cucumber slices were stored in MAP for 7 days at 10 °C and 2 days at 20 °C. The CO2 accumulated to 17.5% and 30% and O2 depleted to 2.5 and 3% at 10 and 20°C, respectively, in the non-perforated OPP film packages. Ethylene accumulated only in non-perforated OPP films at both temperatures. Growth of coliform group at 20 °C and lactic acid bacteria at 10 and 20 °C was greater in slices packaged in non-perforated OPP films than in P-plus films, while growth of mesophiles and psychrotrophs was similar in any packaging films. At the end of storage period, the bacteria isolated frequently from cucumber slices were Enterobacteriaceae and plant pathogenic bacteria. Lactic acid bacteria such as Leuconostoc citreum were detected on slices in non-perforated OPP films.

Aroma, Oxygen and Moisture Barrier Behavior of Coated and Vacuum Coated OPP Films for Packaging

Various coated and vacuum coated, biaxially oriented polypropylene film product designs are examined in terms of their moisture, oxygen and aroma barriers. Factors that are thought to control oxygen barrier in these products are discussed and extended to aroma barrier development. The differences between the various vacuum coated and uncoated films with three organic permeants are evaluated and discussed in relationship to the impact on the polymer/coating interface and the development of aroma barrier in coated films. It is demonstrated that the existence of an evaporated barrier layer does not guarantee the existence of a chemical barrier. New combinations of film technology are described that permit the development of excellent aroma, oxygen and moisture barrier films.