Machine Direction Research Articles

In-plane elastic properties of geosynthetics from in-air biaxial tension tests

Geosynthetics experience load simultaneously in each principal material direction in applications such as retaining walls, constructed slopes, roadways, and reinforced granular load transfer platforms. Biaxial loading results in a stiffer load-strain response compared to that observed in uniaxial loading. Load-strain properties of geosynthetics determined from wide-width uniaxial tension tests are unable to account for this effect and are generally regarded as an index test. This paper presents the development of a biaxial testing procedure to provide load-strain response data necessary to determine in-plane linear elastic tensile properties of geosynthetics. These properties consist of two elastic moduli, two dependent in-plane Poisson's ratios and an in-plane shear modulus. The elastic moduli and Poisson's ratios are derived from non-bias biaxial tests where load is applied in the two principal directions of the material. The in-plane shear modulus is determined from biaxial tests on specimens where load is applied on a bias such that the principal material directions are oriented at a 45-degree angle to the test machine directions. The tests are performed on geosynthetics that have been load conditioned such that the subsequent load-strain response is considered to be a resilient response pertinent to repetitive load applications such as geosynthetic reinforced pavements.

Application of modified wheat starch glues to increase the physical and mechanical parameters of paper and cardboard production processes

The waste paper is mainly used as a fibrous semi-finished product for technological production processes of paper and paperboard products. The use of waste paper in the production of paper and paperboard products makes it possible to reduce the use of natural resources and the load of pollutant emissions on the environment significantly. But together with the positive aspects there are a number of problems in the production process stipulated by lower waste paper quality compared with cellulose. The fiber retention on the wire of a paper or paperboard machine deteriorates, and, accordingly, this leads to contamination of pit water, increasing the raw materials losses with pit water. Repeated use of retained fiber as a sediment degrades the quality of the finished product, because the content of fine fibers in the composition of the finished product increases. Due to such phenomena, in order to increase the percentage of fine fiber on the wire of the paper-paperboard machine and the physical and mechanical properties of the finished product, modified starch glues are used in the paper and paperboard production [1,2].Analysis of literature sources [1,2] and additional studies of paper and paperboard production systems made it possible to determine the field of experimental research, as well as factors that have a decisive influence on the production state. In order to carry out the researches at the laboratory, a plan (matrix) of the experiment is developed. The synthesis of experimental research plans is carried out using criteria that provide maximum informativeness of the conducted experiments [3]. Such approach to the experiment ensures the researcher the maximum possible amount of useful information about the behavior of the object to be studied. It should be noted that with a fairly significant number of factors included to the experiment and the change of factors at least at 4 levels the number of experiments is fixed at a certain reasonable level. However, the researcher has no, i.e. in advance indeterminate, information about the structure of the dependence between the optimization parameters, as well as factors that are included to the process of research and modeling. The next step in the research implementation is to create adequate mathematical models that will be suitable for the purposes of situations modeling that occur by paper and paperboard production. The development of mathematical models is carried out with using the method of self-organization MSUA [4,5].The purpose of this article is to study the effect of starch glue from wheat grains and the degree of its substitution on the paper web quality, provided the glue addition at the stage of waste paper grinding.Based on the results of literature research and previous laboratory studies, a set of factors is determined that, according to the experimenter, will have an influence on the physical and mechanical properties of finished products.Taking into account the fact that the dependencies will be clearly nonlinear, the factors are planned to change, if possible, at 4 levels [3].The following parameters were chosen as optimization parameters, according to which the indices of finished products will be evaluated, namely:- flat compression resistance, H, (Ŷ1);- absolute bursting strength, kPa, (Ŷ2);- specific tearing strength in the machine direction, kN \ m, (Ŷ3);- end compression resistance, kN \ m, (Ŷ4);- surface water absorption, g, Cobb30, (Ŷ5).Experimental studies were carried out at the laboratory of the Department of E and TRP in accordance with the developed matrix of experimental studies.In accordance with the volume of the experimental data and using the necessary methodology [4-5] the mathematical models for optimization parameters were created, which were determined during the process of the research problem setting.Using mathematical models, a study was carried out and was found that the optimal value of the degree of waste paper grinding by glue addition at the stage of grinding for waste paper brand MS-5B by indices: flat compression resistance and absolute bursting strength is within 55° SHR. According to the indices of specific tensile strength and end compression resistance, the optimal value of the grinding degree can be considered to be 60° SHR, at which the maximum strength value is achieved.The next step of the study is to verify in real production conditions the results obtained on the basis of adequate mathematical models.

Tunable Tensile Properties of Polypropylene and Polyethylene Terephthalate Fibrillar Blends through Micro-/Nanolayered Extrusion Technology.

Fiber-reinforcement is a well-established technique to enhance the tensile properties of polymer composites, which is achieved via changing the reinforcing material concentration and orientation. However, the conventional method can be costly and may lead to poor compatibility issues. To overcome these challenges, we demonstrate the use of micro-/nanolayer (MNL) extrusion technology to tune the mechanical properties of polypropylene (PP)/polyethylene terephthalate (PET) fibrillar blends. PET nanofibers-in-PP microfiber composites, with 3, 7, and 15 wt.% PET, are first prepared using a spunbond system to induce high aspect-ratio PET nanofibers. The PP/PET fibers are then reprocessed in an MNL extrusion system and subjected to shear and extensional flow fields in the channels of the uniquely designed layer multipliers. Increasing the mass flow rate and number of multipliers is shown to orient the PET nanofibers along the machine direction (MD), as confirmed via scanning electron microscopy. Tensile tests reveal that up to a 45% and 46% enhancement in elastic modulus and yield strength are achieved owing to the highly aligned PET nanofibers along the MD under strongest processing conditions. Overall, the range of tensile properties obtained using MNL extrusion implies that the properties of fiber-reinforced composites can be further tuned by employing this processing technique.

Effect of molecular weight on molecular orientation and morphology of polypropylene sheets containing a β‐nucleating agent

AbstractIn this study, polypropylene (PP) films containing the β nucleating agent,N,N′‐dicyclohexyl‐2,6‐naphthalenedicarboxamide, were prepared using PP with three different molecular weights (low, medium, and high) by extrusion process with T‐shaped die. The structure and morphology of the films were studied after stretching. It was found that a unique molecular orientation, in which both thec‐axis and crystalline lamellae were oriented perpendicular to the flow direction, was formed in all undrawn film samples, irrespective of the molecular weights of the PP. In the PP sheets stretched in the machine direction, the low‐molecular‐weight sample containing the nucleating agent exhibited brittle properties owing to a lack of tie chains in the stretching direction. In contrast, cavitation was prominent in the medium (M‐PP)‐ and high (H‐PP)‐molecular‐weight samples. Notably, M‐PP containing the nucleating agent, with a high degree of molecular orientation, promoted the formation of a large number of voids. In H‐PP containing the nucleating agent, the presence of numerous tie chains inhibited cavitation, resulting in fewer voids. The experimental results demonstrated the influence of the molecular weight on the void structure, which will be useful in the field of microporous membranes.

Design of Powernet Knitted Fabrics from PET/BaTiO3 as Pressure Garments for Rehabilitation of Cerebral Palsy

In this study, powernet warp-knit fabrics were designed using polyethylene terephthalate (PET) yarns melt-spun with three different amounts (20, 25, and 30 wt.%) of barium titanate (BaTiO3) and 30 wt.% elastane yarns. The resulting fabrics were characterized by antimicrobial activity cytotoxicity electromagnetic shielding properties, differential scanning calorimetry (DSC) analyses, stiffness tests at MD and CD (machine and cross directions), and pressure measurements using wireless pressure sensors. According to the results, the newly-designed pressure garments would help in the rehabilitation of cerebral palsy patients to improve motor skills and to prevent complications by training muscles with the needed tight structure and electric stimulus onto limbs. They would also provide a hygienic environment during long physical therapy for future designs.

Optimizing Roller Design to Improve Web Strain Uniformity in Roll-to-Roll Process

In this work, we investigated the compensation of strain deviation in the machine direction of a web in the roll-to-roll process. As flexible devices have become popular, many researchers have begun to study roll-to-roll processes for the mass-production of flexible devices at low cost. In the continuous roll-to-roll process, an electronic circuit pattern is printed on the web while the web is transferring. Due to tension and Poisson’s ratio, a non-uniform strain distribution can occur in the web. This strain distribution occurs mainly at the center of the web and causes a register error in the machine direction. In this work, we designed a roller to minimize the strain deviation. The design of the compensation roller was optimized using the design of experiments (DOE) methodology and analysis of variance (ANOVA), and the compensation performance was verified through experiments and simulations. According to the results of a comparative experiment conducted to confirm the correcting performance of the optimized roller, the strain deviation in the machine direction decreased by approximately 48% with the proposed roller compared to that of the conventional roller.

Healthcare Professional Protective Mask for COVID-19

The World Health Organization’s (WHO) guidelines regarding prevention and control of the COVID-19 outbreak recommends respiratory hygiene and the use of personal protective equipment. Three layered antiviral mask has been developed by combining polyester nonwoven as an outer, Polytetrafluroethylene (PTFE) as a middle and viscose nonwoven as an inner layer. All three layers of fabrics were fused as laminate to develop the mask to protect healthcare professionals from Corona virus. All the surgical mask tests were performed to make compliance with global standards. Primarily viral penetration and bacterial filtration efficiency was performed according to ASTM standard F1671 and F2100 respectively. Mean flow pore diameter of Single layer Polyester surgical mask, Dual layer of Polyester and PTFE film surgical mask, three layered surgical mask was 0.33, 0.30, 0.39 µm. The developed three layered fabric with polyester as an outer layer, microporous PTFE film as a middle layer and viscose nonwoven fabric as an inner layer has passed the viral penetration test, which confirms that the mask has protection against Corona virus. Paired t-test analysis of the tensile strength in machine and cross directions shows that there is significant difference at 95% confidence interval. Single layer polyester nonwoven surgical mask failed viral penetration test as the average pore diameter is 0.33 µm which is more than size of ΦX174 bacteriophage virus as 0.2 µm and in the absence of PTFE film. Dual and three layered surgical mask passed viral penetration analysis as it has smallest pore diameter is 0.16 µm and 0.19 µm respectively. PTFE film allows water vapour to pass through. In the current pathetic and demanding situation the three layered surgical mask was having barrier against Coronavirus which facilitate healthcare care professionals from cross-contamination and protecting them from current Pandemic

Influence of fibre orientation on cutting force in up and down milling of UD-CFRP composites

Machining of carbon fibre reinforced polymer (CFRP) composites is extremely difficult, mainly due to their inhomogeneous and anisotropic properties. Predicting of cutting force during machining of CFRP is also difficult because the machinability properties of the composite are significantly orientation-dependent (fibre and machining directions). The main objective of the present study is to analyse the influence of fibre orientation on cutting force in milling of unidirectional CFRP. Up and down milling experiences were conducted based on a full factorial design. Experimental data were processed by fast Fourier transformation, regression analysis, and graphical adequate analysis. Multiple-order polynomial models were developed in order to minimise cutting force. Experimental results show that fibre orientation angle significantly influences the cutting force; furthermore, it does not have a significant effect on the passive force component, while the radial force component is more sensitive to the fibre orientation at up milling, than at down milling. An optimal condition is recommended for zig-zag milling of unidirectional CFRPs.

Preparation, characterization and properties of biodegradable poly(butylene adipate‐co‐butylene terephthalate)/thermoplastic poly(propylene carbonate) polyurethane blend films

Poly(butylene adipate‐co‐terephthalate) (PBAT)/thermoplastic poly(propylene carbonate) polyurethane (PPCU)/ADR blend films were obtained by melt blending and blowing films technique. The rheological behavior, thermal properties, mechanical properties, barrier properties, water vapor permeability (WVP), wettability performances, optical properties, and biodegradability properties were investigated. Differential scanning calorimetry (DSC) and dynamic mechanical analysis (DMA) indicated that PBAT and PPCU had good miscibility. The addition of PPCU could reduce the crystallization process. All blend films exhibited good mechanical properties with high tensile strength of 42.1 to 66.6 MPa and elongation at break of 629% to 968% in the machine direction (MD) and tensile strength of 33.2 to 46.4 MPa and elongation at break of 1080% to 1665% in the transverse direction (TD). The thermal stability of PBAT/PPCU/ADR blend films was decreased when PPCU was added, however the processing and use of blend films were not affected. From barrier properties and WVP analysis, all PBAT/PPCU/ADR blend films showed good water vapor barrier properties and gas barrier performance. Surfaces of PBAT/PPCU/ADR blend films were hydrophobic with contact angle of 94.3° to 102.6°. All PBAT/PPCU/ADR blend films had high transparency. Biodegradability results showed that PPCU content could affect biodegradability of the films. This study indicates that PBAT/PPCU/ADR blend films as biodegradable packaging materials have great potential for application in fresh fruit and vegetable packaging, cosmetics and other industries in the future.

Optimal design and experimental investigation of the material-nanostability and deformation behaviour of Al-5.78Zn-1.45Cu-2.49 Mg, Al-5.6Zn-2.5Mg-1.6Cu and Al-Mg-0.6Si alloys under cyclic-loading for ultra-precision structural applications

This paper presents the design and construction of a new simple test facility for the investigation and testing of the deformation behaviour of material properties, namely plastic monolithic, inelastic, elastic and spring joints under cyclic loadings. Test samples were prepared in various machining directions (orthogonal and longitudinal) of Al-5.78Zn-1.45Cu-2.49 Mg, Al-5.6Zn-2.5Mg-1.6Cu and Al-Mg-0.6Si aluminium alloys. As a pulling force for sample deformation, an electromagnet unit was used. The test load range was between 0.2N to 200N, increased by a programmable factor of 1.1-1.4 for a train time of 900s. Two capacitive sensors and interferometers sensors mounted at different sample locations were used to test the sample deformation with and without loading. In a temperature-stable housing that offers isothermal conditions, the overall measuring machine is integrated. The calculated parameters include plastic and inelastic deformation.

Spunlace (Su Jeti ile Bağlama) Teknolojisi ile Üretilen Dokusuz Yüzeylerin Morfolojik Özelliklerinden Bazı Performans Özelliklerinin Yapay Zeka ile Tahminlenmesi

Fiber placement and fiber distribution characteristics of nonwoven surfaces significantly affect the physical, mechanical and permeability properties of the fabric. In the studies from the literature, significant relationships between fiber distribution and porosity with mechanical performance properties have been revealed. In this study, an algorithm developed using image processing techniques for statistical data related to texture features were obtained images from nonwoven surface fabric samples. The texture features obtained were used as input data in the artificial neural network model. Air permeability, machine direction breaking strength, cross direction breaking strenth, and breaking elongation performance characteristics were used as output data. Thus, it is aimed to estimate the air permeability, breaking strength and breaking elongation performances of the fabric samples produced with spunlace (hydroentaglement bonding) technology without testing by using the texture characteristic features obtained directly from the surface images. As a result, the correlation coefficient values of R2 = 0,97 in air permeability, R2 = 0,90 in breaking strength and R2 = 0,89 in breaking elongation were obtained between experimental results and artificial neural network prediction results.

Effect of Structural Parameters on the Deformational Behaviors of Multiply 3D Layer-by-Layer Angle-Interlock Para-Aramid Fabric for Fiber-Reinforcement Composite

Materials used in the technical application including composite reinforcements and ballistic fabrics should show not only good mechanical performance but also better deformational behaviors. Meanwhile, three dimensional (3D) warp interlock fabrics have been widely employed in such applications to substitute the two dimensional (2D) fabrics because of their enhanced through-the-thickness performance and excellent formability. The deformational behaviors of such 3D warp interlock fabrics have been also influenced by various internal and external parameters. To understand and fill this gap, the current paper investigates the effects of the warp yarn interchange ratios inside the fabric structure on the formability behaviors of dry 3D warp interlock p-aramid fabrics. Four 3D warp interlock architecture types made with different binding and stuffer warp yarn interchange ratios were designed and manufactured. An adapted hydraulic-driven stamping bench along with hemispherical punch was utilized for better forming behavior analysis such as in-plane shear angle and its recovery, material drawing-in and its recovery, deformational depth recovery, and required stamping forces. Based on the investigation of various formability behaviors, the formability of (3D) warp interlock fabrics were greatly influenced by the binding and stuffer warp yarns interchange ratio inside the 3D warp interlock structure. For example, preform 3D-8W-0S exhibited a maximum deformational height recovery percentage of 5.1%, whereas 3D-4W-8S recorded only 0.72%. Preform 3D-8W-4S and 3D-8W-8S revealed 1.45% and 4.35% recovery percentages toward the deformational height at maximum position. Besides, sample 3D-4S-8W revealed the maximum drawing-in recovery percentage of 43.13% and 46.98% in the machine and cross direction, respectively, around the preform peripheral edges. On the contrary, samples with higher binding warp yarns as 3D-8W-0S show the maximum drawing-in recovery percentages values of 31.21% and 34.99% in the machine and cross directions respectively.

Design Modification of Ice-Cream Cone to Control Ink Migration and Crimping

In the present study, two unaddressed problems, ink migration and crimping in ice-cream cones of a reputed brand along with three different market samples were aimed and their solutions were portrayed. The mechanical properties like thickness and grammage of the individual layer as well as of whole material and scuff proofness strength were determined. The cross-direction and machine direction analysis during the cone formation process revealed their effect on proper combination of cone structure and lid. The problem of crimping in S3 brand was due to swapping of cross-direction and machine-direction during the cone formation process. The ink migration on the hands of the observer during the cold storage could not be correlated with the scuff proofness testing as all the samples showed slight scuffing of printed ink at 1000 rpm and 2 psi pressure. Yet, a different package design was proposed to prevent ink migration in which water resistance ink protective coating of nitrocellulose was suggested.

Effect of Process Parameters on Tensile Strength of Sansevieria and Areca Husk Fiber Needle-Punched Nonwoven Fabrics

Abstract The present study intends to determine the optimum process conditions for needle punching the nonwoven fabrics produced from blends of sansevieria and areca husk fibers. The Box–Behnken experimental design is used for the optimization of the fabric weight (200–400 g/m2), punch density (150–250 punches/cm2), and blend ratio (30:70–70:30) with respect to the tensile strength of the nonwoven fabrics and to evaluate the effects and interactions of the needle punching process conditions. The optimum process conditions were obtained at a fabric weight of 400 g/m2, 250 punches/cm2, and 70:30 blend ratio. Nonwoven fabric with a highest breaking force of 17.58 N in the machine direction and 36.51 N in the transverse direction was obtained at the optimum process conditions. The nonwoven fabric developed from this study can be used as a floor covering material in the construction field.

Plasticization Effect of Poly(Lactic Acid) in the Poly(Butylene Adipate-co-Terephthalate) Blown Film for Tear Resistance Improvement.

The mechanical properties and tear resistance of an ecofriendly flexible packaging film, i.e., poly(lactic acid) (PLA)/poly (butylene adipate–co–terephthalate) (PBAT) film, were investigated via a blown film extrusion process. The application of PLA and PBAT in product packaging is limited due to the high brittleness, low stiffness, and incompatibility of the materials. In this study, the effects of various plasticizers, such as adipate, adipic acid, glycerol ester, and adipic acid ester, on the plasticization of PLA and fabrication of the PLA/PBAT blown film were comprehensively evaluated. It was determined that the plasticizer containing ether and ester functionalities (i.e., adipic acid ester) improved the flexibility of PLA as well as its compatibility with PBAT. It was found that the addition of the plasticizer effectively promoted chain mobility of the PLA matrix. Moreover, the interfacial adhesion between the plasticized PLA domain and PBAT matrix was enhanced. The results of the present study demonstrated that the plasticized PLA/PBAT blown film prepared utilizing a blown film extrusion process exhibited improved tear resistance, which increased from 4.63 to 8.67 N/mm in machine direction and from 13.19 to 16.16 N/mm in the transverse direction.

Crystallization Behaviors of Plasticized Poly(Lactic Acid)/Microcrystalline Cellulose Composite Sheet

Poly(lactic acid) (PLA) is a potential biodegradable polymer to replace petroleum-based plastic, however, its main drawback is brittleness because of slow crystallization rate. To overcome this limitation, compounding with some additives is the most chosen choice due to easy and effective preparation. In this study, an epoxidized soybean oil (ESO) and a microcrystalline cellulose (MCC) were applied as a plasticizer and a nucleating agent, respectively. The PLA was compounded with ESO and MCC by using a twin-screw extruder. The product sheets were prepared by using a chill-roll cast film extruder. Change of thermal property after adding ESO and MCC was investigated by a differential scanning calorimeter. Mechanical property of the prepared sheet was carried out by using a universal testing machine in a tensile mode. Microstructure of the sheets was also studied by wide angle X-ray diffraction (WAXD) and small angle X-ray scattering (SAXS) techniques. The results showed that ESO assisted plasticization while the MCC induced crystallization of PLA. Also, ESO and MCC eased flowability and alignment of PLA microstructure in machine direction.

Surfactant-assisted β-NA supramolecular self-assembly in mini injection molding PP composite

The introduction of surfactant (polyoxyethylene sorbitan monoisostearic acid ester, Tween-60) conduces to the dispersion of β-NA (N,N′-dicyclohexylterephthalamide, TMB-5) and regulation of its self-assembly morphologies. In this work, surfactant-assisted β-NA was firstly utilized in a strong flow field when processing β-iPP by mini-jet injection molding. The polymorphism morphologies and crystalline structure in isotactic polypropylene (iPP)/surfactant-assisted β-NA self-assembly were explored. The SEM results indicated that hierarchical structures containing shish-kebab and cylindrites in the skin and mid layer, inter-locked β-transcrystals and spherulites structure in the core layer were obtained. The strong shear drove the surfactant-assisted β-NA self-assembly needles to align in a dense orientation along machine direction which induced the formation of inter-locked β-transcrystals. The crystalline structure and orientation of different layers were further investigated via small-angle X-ray scattering (SAXS) and wide-angle X-ray diffraction (WAXD) characterization. The variation of surfactant-assisted β-NA supramolecular self-assembly and crystalline structure in mini injection molding PP composites were systematically discussed. This paper would have referential significance for the β-NA self-assembly.

Thermal error compensation of a 5-axis machine tool using indigenous temperature sensors and CNC integrated Python code validated with a machined test piece

Achieving high workpiece accuracy is the long-term goal of machine tool designers. There are many causes for workpiece inaccuracy, with thermal errors being the most common. Indirect compensation (using prediction models for thermal errors) is a promising strategy to reduce thermal errors without increasing machine tool costs. The modelling approach uses transfer functions to deal with this issue; it is an established dynamic method with a physical basis, and its modelling and calculation speed are suitable for real-time applications. This research presents compensation for the main internal and external heat sources affecting the 5-axis machine tool structure including spindle rotation, three linear axes movements, rotary C axis and time-varying environmental temperature influence, save for the cutting process. A mathematical model using transfer functions is implemented directly into the control system of a milling centre to compensate for thermal errors in real time using Python programming language. The inputs of the compensation algorithm are indigenous temperature sensors used primarily for diagnostic purposes in the machine. Therefore, no additional temperature sensors are necessary. This achieved a significant reduction in thermal errors in three machine directions X, Y and Z during verification testing lasting over 60 h. Moreover, a thermal test piece was machined to verify the industrial applicability of the introduced approach. The results of the transfer function model compared with the machine tool's multiple linear regression compensation model are discussed.

Cold Tribo-Nanolithography on Metallic Thin-Film Surfaces.

This paper demonstrates a modified tribo-nanolithgraphy (TNL), micro- to nanometer scale mechanical machining processes, on metallic thin film surfaces which have poor machinability in micro scale under several mN normal loads. TNL is one of the promising atomic force microscopy (AFM)-based lithography processes which is more effective fabrication technology, as compared to conventional photolithography due to its relatively simple processes, high resolution, short processing time, and low cost. We propose ultra-precision machining at sub-0 °C temperatures using a lab-made micro polycrystalline diamond (PCD) tool on a retrofitted piezo stage with a Peltier device. The workpiece, located on the stage, is cooled artificially, and a normal load of several mN is applied by a micro PCD tool for micro scale machining processes. The machining results indicated considerably different machinability when the work was performed at sub-0 °C, as opposed to the ambient surface temperature, due to the changed mechanical characteristics of surface by the forced cooling of the workpiece. Although the normal load, machining speed, and machining area remained constant, the width and depth of machined grooves are significantly increased at sub-0 °C temperature conditions. In addition, we analyzed the TNL characteristics when machining with the PCD tool in four different machining directions. The mechanical surface properties, surface topography, scanning electron microscope (SEM) images, chip formation and other physical properties are investigated for more discussions.

Preparation of polypropylene/poly (butylene adipate‐co‐terephthalate) composite films incorporated with melanin for prevention of greening of potatoes

Polypropylene (PP) and poly (butylene adipate‐co‐terephthalate) (PBAT) blend films incorporated with melanin (Mel) were prepared using an extrusion casting method. Scanning electron microscopy results showed that Mel was evenly dispersed to form a well‐blended film. The PP/PBAT/Mel composite films prevented UV light transmittance, especially UV‐B rays. The addition of Mel influenced the surface color, water vapor transmission rate, oxygen transmission rate, and water contact angle of the composite films. After the addition of Mel, the tensile strength and elongation at break in the machine direction of the composite film increased by 30% and 27%, respectively. Packaging potatoes with PP/PBAT/Mel film and storing them under fluorescent light for 6 days effectively prevented the greening of potatoes caused by the production of chlorophyll. The PP/PBAT/Mel films have a high potential for the prevention of greening of potatoes during storage and distribution.