The Effect of Light on the Changes of White Office Paper

2016 ◽  
Vol 688 ◽  
pp. 104-111
Author(s):  
Jarmila Geffertova ◽  
Anton Geffert ◽  
Nencho Deliiski
Keyword(s):  
Light Fastness ◽  
Functional Feature ◽  
Paper Surface ◽  
Near Ultraviolet ◽  
Tear Index ◽  
Paper Ageing ◽  
Breaking Length ◽  
Ultraviolet Treatment ◽  
Effect Of Light ◽  
Office Paper

Light, primarily its more energy-rich component - near ultraviolet radiation, causes gradual degradation (ageing) of paper and other organic based materials. The objective was to determine selected characteristics of the changes of white office paper, which occur under intensive ultraviolet treatment, and to calculate their light fastness, as this is an important functional feature for the number of papers. The most visible sign of paper ageing is the change of its optical characteristics. The value of specific lightness decreased by 2.2%, red / green coordinate a* moved from the red region (1.5) colour space to green (-0.8), b* coordinate moved from the blue region (-8.4) to yellow (4.7) and colour difference ΔE* reached 13.4 during 120 minutes' exposure. The pH values of paper surface gradually decreased with time of UV exposure from 8.86 to 7.91. Effects of light also deteriorated the selected mechanical characteristics of paper, such as breaking length and tear index. Out of the monitored properties, the specific lightness of paper surface showed the greatest stability (97.8%). UV radiation most affected breaking length of paper whose stability was only 79.4%.

Passivation of pressure sensitive adhesive stickies by addition of acrylic fibers to OCC pulp before papermaking

TAPPI Journal ◽  
2016 ◽  
Vol 15 (10) ◽  
pp. 631-639
Author(s):  
MOHAMMAD HADI ARYAIE MONFARED ◽  
HOSSEIN RESALATI ◽  
ALI GHASEMIAN ◽  
MARTIN A. HUBBE
Keyword(s):  
Adverse Effects ◽  
Control Sample ◽  
Pressure Sensitive Adhesive ◽  
Acrylic Fiber ◽  
Burst Strength ◽  
Pressure Sensitive Adhesives ◽  
Pressure Sensitive ◽  
Tear Index ◽  
Breaking Length ◽  
Acrylic Fibers

This study investigated the addition of acrylic fiber to old corrugated container (OCC) pulp as a possible means of overcoming adverse effects of water-based pressure sensitive adhesives during manufacture of paper or paperboard. Such adhesives can constitute a main source of stickies, which hurt the efficiency of the papermaking process and make tacky spots in the product. The highest amount of acrylic fiber added to recycled pulps generally resulted in a 77% reduction in accepted pulp microstickies. The addition of acrylic fibers also increased pulp freeness, tear index, burst strength, and breaking length, though there was a reduction in screen yield. Hence, in addition to controlling the adverse effects of stickies, the addition of acrylic fibers resulted in the improvement of the mechanical properties of paper compared with a control sample.

EFFECT OF LIGHT ON GEMMAE FORMATION: IN MYCENA CITRICOLOR

1967 ◽  
Vol 45 (5) ◽  
pp. 675-679 ◽  
Author(s):  
C. J. Rodrigues Jr. ◽  
D. C. Arny
Keyword(s):  
Light Intensity ◽  
Ultraviolet Light ◽  
Exposure Time ◽  
Lesion Size ◽  
Yellow Pigment ◽  
Limited Size ◽  
Maximum Production ◽  
Near Ultraviolet ◽  
Test Conditions ◽  
Effect Of Light

Maximum production of gemmae and yellow pigment by Mycena citricolor occurred under a glass filter which transmitted near ultraviolet light (310–400 mμ) and infrared. Within the limits of test conditions involving four rather broad areas of the spectrum, gemmae formation decreased as wavelength of light increased. Optimum light intensity was between 20 and 160 ft-c. At 740 ft-c the optimum daily exposure time was 6 hours. Infected leaves of Coffee arabicz in the light produced lesions of limited size and having numerous gemmae, but, in the dark, lesion size was indeterminate and no gemmae were formed.

scholarly journals Study on technology of greaseproof paper for dry food packaging

2021 ◽  
Vol 63 (3) ◽  
pp. 55-59
Author(s):  
Van Son Cao ◽  
◽  
Thi Quynh Hoa Le ◽  
Thi Thu Nguyet Do ◽  
Thanh Tu Do ◽  
...  
Keyword(s):  
Food Safety ◽  
Food Packaging ◽  
Laboratory Scale ◽  
Experimental Production ◽  
Machine Direction ◽  
Research Results ◽  
Cross Direction ◽  
Tear Index ◽  
Breaking Length ◽  
Dry Food

This paper presents the research results that established the main technological conditions in the production of greaseproof paper, used as the packaging of dry food as the proportion of pulp types, the degree of the beating of pulp, the use of chemicals and oil and greaseproof resistant agent to the properties of the paper on a laboratory scale. At the same time, experimental production and technology conditions were regulated on a 3 ton/day capacity line. The paper quality produced is equivalent to the imported paper products of the same type which is consumed in the market: basis weight: 42.5 g/m2; tensile breaking length: MD (Machine Direction): 7,520 m, CD (Cross Direction): 3,740 m; tear index: MD: 6.8 mN.m2/g, CD: 5.4 mN.m2/g; burst index: 5.6 kPa.m2/g; Cobb60: 17.2 g/m2; KIT rating: 8; ensuring food safety and hygiene.

Investigation of the effect of light fastness on the color changes of maps prepared by electrophotographic digital printing

2022 ◽  
Vol 0 (0) ◽  
Author(s):  
Zafer Özomay ◽  
Çağla Koşak Söz ◽  
Sinan Sönmez
Keyword(s):  
The Other ◽  
Digital Printing ◽  
Light Fastness ◽  
Color Changes ◽  
Before And After ◽  
Printing System ◽  
Different Color ◽  
Coated Surfaces ◽  
Electrophotographic Printing ◽  
Effect Of Light

Abstract In this study the prints were made on paper substrates, which were thought as map substrate alternatives, with 3 different surface properties at 1200 dpi by using the electrophotographic printing system. Color and gloss values of the samples were determined both before and after exposure to light for a period of 42 hours to determine the light fastness of the substrate and the print on it. The studies revealed that after the light fastness tests (i) the width of the color universe of the papers with matte surfaces is more than that of the papers with glossy surfaces, (ii) the loss of brightness of woodfree paper is higher than that of the other paper samples and (iii) the print chroma values obtained in woodfree paper is lower than those of the coated surfaces. Moreover, (iv) the delta E 00 {E_{00}} measurements revealed that all paper samples experienced different color losses in different colors, and the most significant differences in these color losses were in magenta and black.

Enhancement of processability, surface, and mechanical properties of paper based on rice straw pulp using biopolymers for packaging applications

TAPPI Journal ◽  
2019 ◽  
Vol 18 (7) ◽  
pp. 431-440
Author(s):  
SHUBHANG BHARDWAJ ◽  
NISHI KANT BHARDWAJ ◽  
YUVRAJ SINGH NEGI
Keyword(s):  
Rice Straw ◽  
Suspended Solids ◽  
Strength Properties ◽  
Absorption Index ◽  
Paper Machine ◽  
Oxidized Starch ◽  
Surface Sizing ◽  
Tear Index ◽  
Breaking Length ◽  
Crush Strength

Two biopolymers, chitosan and oxidized starch, were used as wet-end additives to improve the strength properties of the paper because of their biodegradable and non-hazardous qualities. The present study reports the improvement in surface and strength properties of packaging-grade paper made with rice straw pulp using biopolymers, chitosan, oxidized starch, and surface sizing added at the wet end of the paper machine. Use of chitosan at all doses from 0.5 to 10 kg/ton enhanced important surface and strength properties of paper. The breaking length, tear index, burst index, ring crush strength, stretch, tensile energy absorption index, and Taber stiffness of the paper with 10 kg/ton of chitosan as a wet-end additive showed 22%, 14%, 20%, 59%, 16%, 44%, and 48% improvement, respectively, in comparison to control, (i.e, without its addition). The Cobb60 was also reduced by 45%, showing better resistance to water in comparison to rice straw paper alone. The effects of chitosan added at the wet end on the paper surface were investigated using Fourier transform infrared spectroscopy (FTIR). The use of 10 kg/ton of chitosan at the wet end reduced the color and total suspended solids in the back water of the papermaking system by 55% and 51%, respectively. Further enhancement in the surface and strength properties of paper was observed following surface sizing with oxidized starch.

scholarly journals Role of Cellulose Nanofibrils in Improving the Strength Properties of Papers: A Review

2021 ◽  
Author(s):  
Thabisile Brightwell Jele ◽  
Prabashni Lekha ◽  
Bruce Sithole
Keyword(s):  
Cellulose Nanofibrils ◽  
High Strength ◽  
Barrier Properties ◽  
Strength Properties ◽  
Biochemical Properties ◽  
Factors Affecting ◽  
Tear Index ◽  
Different Types ◽  
Breaking Length

Abstract The pursuit for sustainability in the papermaking industry calls for the elimination or reduction of synthetic additives and the exploration of renewable and biodegradable alternatives. Cellulose nanofibrils (CNFs), due to their inherent morphological and biochemical properties, are an excellent alternative to synthetic additives. These properties enable CNFs to improve the mechanical, functional and barrier properties of different types of paper. The nanosize diameter, micrometre length, semi-crystalline structure, high strength and modulus of CNFs has a direct influence on the mechanical properties of paper such as tensile index, burst index, Scott index, breaking length, tear index, Z-strength, E-modulus, strain at break, and tensile stiffness. This review details the role played by CNFs as an additive to improve strength properties of papers and the factors affecting the improvement in paper quality when CNFs are added as additives. The paper also includes techno-economic aspects of the process and identifies areas that need further research.

scholarly journals Chemical Composition and Pulp Properties of Abaca (Musa textilis Née) cv. Inosa Harvested at Different Stages of Stalk Maturity

2012 ◽  
pp. 45-62
Author(s):  
Luz Moreno ◽  
Calixto Protacio
Keyword(s):  
Chemical Properties ◽  
Ash Content ◽  
Pulp And Paper ◽  
Pulp Yield ◽  
Paper Production ◽  
Tear Index ◽  
Global Demand ◽  
Breaking Length ◽  
Pulp Properties

Given the increasing global demand for pulp, there is a need to look into the prospects of increasing fiber production and shortening the harvesting cycle of abaca without sacrificing the quality of fibers for pulp production. This study investigated the chemical and pulp properties of abaca cv. Inosa fibers harvested at different stages of stalk maturity to determine their suitability for pulp and paper production. Fibers obtained from 8-10-month-old (immature) abaca cv. Inosa possessed the desirable chemical properties for pulping, namely; low lignin and ash content, high alpha-cellulose, holocellulose and hemi- cellulose contents; which are comparable with those obtained from intermediate and mature stalks. The average pulp yield, Kappa number, viscosity, tear index and breaking length of pulps from immature stalks were already comparable with those of mature fibers and were even higher than the mature fibers of Linawaan and Laylay cultivars. Fibers of abaca cv. Inosa obtained from immature stalks were thus, found suitable for pulp and paper production.

Effects of Latency Removal on the Fiber Properties of Poplar APMP

2013 ◽  
Vol 690-693 ◽  
pp. 1101-1104
Author(s):  
Lin Qu ◽  
Jia Chuan Chen ◽  
Gui Hua Yang
Keyword(s):  
High Temperature ◽  
Physical Properties ◽  
Strength Properties ◽  
Pulp Fibers ◽  
Fiber Properties ◽  
Important Stage ◽  
Tear Index ◽  
Breaking Length

The refining is the important stage in the APMP pulping process, and high temperature pulses generated in this stage make pulp fibers stiff and ankylosis, which can reduce the strength properties of the pulp. Latency removal is the best way to modify pulp fibers properties and improve their strength. This study focused on the effect of latency removal on the properties of the poplar APMP pulp. atency removal can improve effectively the physical properties of the APMP pulp,the breaking length of the latency removal pulp increased 3.06%, burst index increased 1.97%, tear index decreased 6.07%, and brightness increased by 0.38%ISO.in the 60°C. the breaking length of the latency removal pulp increased 11.80%, burst index increased 14.30%, tear index decreased 6.63%, and brightness increased by 0.77%ISO in the 80°C.

Improving Hydrogen Peroxide Bleaching of PRC-APMP by Using Urea

2013 ◽  
Vol 295-298 ◽  
pp. 335-338
Author(s):  
Zong Quan Li ◽  
Hong Yan Dou ◽  
Xiao Qian Chen ◽  
Chao Wang
Keyword(s):  
Hydrogen Peroxide ◽  
Fiber Length ◽  
High Yield ◽  
Mechanical Pulp ◽  
Peroxide Bleaching ◽  
Bleached Pulp ◽  
Alkaline Peroxide ◽  
Tear Index ◽  
Breaking Length ◽  
Urea Addition

Preconditioning Refiner Chemic Alkaline Peroxide Mechanical Pulp (PRC-APMP) is one of the most currently used high yield pulps in China. During the bleaching of PRC-APMP, hydrogen peroxide is a commonly used bleaching agent. In order to improve the bleaching efficiency of PRC-APMP, urea was used as an activator in peroxide bleaching of aspen PRC-APMP. The results showed that the brightness of the urea-based bleached pulp higher than that without urea addition at the same hydrogen peroxide dosage. The physical properties such as the breaking length, tear index and fiber length of the bleached pulp were comparable to those without urea addition in peroxide bleaching.

scholarly journals EFFECT OF PAPER SURFACE PROPERTIES ON INK COLOR CHANGE, PRINT GLOSS AND LIGHT FASTNESS RESISTANCE

2021 ◽  
Vol 55 (1-2) ◽  
pp. 133-139
Author(s):  
CEM AYDEMIR ◽  
NEMANJA KAŠIKOVIC ◽  
CSABA HORVATH ◽  
STEFAN DURDEVIC
Keyword(s):  
Surface Roughness ◽  
Surface Structure ◽  
Surface Topography ◽  
Color Change ◽  
Quality Level ◽  
Print Quality ◽  
Light Fastness ◽  
Related Factors ◽  
Paper Surface ◽  
Made In

"Printability is a combination of paper-related factors that contribute to achieving the desired print quality level and relates to the paper's ability to absorb ink. An important property of ink on paper is its setting behavior. The spread and placement of the ink on the paper surface is affected by the surface structure of the paper. The surface topography of the paper is decisive in the process of ink placement on the paper surface. In this study, the effects of surface roughness of the paper on wettability, print gloss, ink color change and light fastness change were investigated. For this purpose, prints on papers with different surface roughness were made in accordance with ISO 12647-2 with Cyan color ink in accordance with DIN ISO 2846-1. The CIE L*a*b* and gloss values of the test prints, which were allowed to dry in order to detect color and print gloss differences on the paper surfaces, were measured periodically until the ink film was completely dry. In addition, the effects of the paper surface on the light fastness of the ink were measured and recorded. The results were discussed in terms of print quality. "

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