scholarly journals The Influence of the Roll-Laminating Process on the Bonding Quality of Polymer-Coated Steel Interface

Coatings ◽  
2021 ◽  
Vol 11 (4) ◽  
pp. 472
Author(s):  
Jiyang Liu ◽  
Qingdong Zhang ◽  
Boyang Zhang ◽  
Mingyang Yu
Keyword(s):  
Bonding Strength ◽  
Coated Steel ◽  
Interface Bonding ◽  
Relevant Research ◽  
Bonding Quality ◽  
Bonding Area ◽  
New Type ◽  
Lamination Process ◽  
Bonding Rate

Polymer-coated steel (PCS) is a new type of metal packaging material under development, which has better performance in saving resources, energy, and environmental protection. The lamination process has an important influence on the bonding quality of the PCS interface. PCS samples under different lamination temperatures and lamination speeds were prepared through experiments. A binding rate is defined to represent the real bonding area of the PCS interface. The micro-scratch tester and scanner are used to study the influence of the lamination process on the bonding rate and bonding strength of the PCS interface. It is proposed that the bonding rate and bonding strength of the PCS interface increases with the increase of lamination temperature and increases with the decrease of lamination speed. The PCS interface bonding rate and bonding strength are positively correlated. SEM and DSC experiments revealed the cause of bubbles on the PCS surface. It is proposed that controlling the uniformity of the TFS surface temperature can reduce the quality defects of PCS surface bubbles. Relevant research results bring guiding significance for the formation of enterprises.

Design of Ultrasonic Measurement System for BRRPO

2012 ◽  
Vol 229-231 ◽  
pp. 1419-1422
Author(s):  
Meng Meng Qu ◽  
Peng Zhai ◽  
Shao Peng Zhai
Keyword(s):  
Measurement System ◽  
Special Functions ◽  
Flaw Detection ◽  
Ultrasonic Measurement ◽  
Bonding Quality ◽  
Ultrasonic Flaw Detection ◽  
Ultrasonic Flaw ◽  
Basic Functions ◽  
Bonding Rate

Bonding rate of ring and piston's ontology (BRRPO) is used to describe the bonding quality of inserted ring and piston's ontology. According to the basic principle of ultrasonic flaw detection, shape of inserted ring and nature of material, penetration method is utilized to detect the bonding quality. An ultrasonic measurement system is designed. The design consists of hardware and software. Controlling process of hardware has been designed legally and made the detection precise. The design of software, based on VC++, consists of accomplishment of basic functions, such as data collection and data processed, and some special functions, such as automatic detection.

Study and Measurement of Micro-Scale Bonding Strength in Vertical Direction

2007 ◽  
Author(s):  
Dongning Liu ◽  
Dacheng Zhang
Keyword(s):  
Edge Effect ◽  
Bonding Strength ◽  
Vertical Direction ◽  
In Situ Monitoring ◽  
Vertical Force ◽  
Bonding Quality ◽  
Micro Scale ◽  
Silicon Cantilever ◽  
Bonding Area

A new way to evaluate the strength of micro-scale bonding is developed by using a silicon cantilever beam bonded on the substrate by a small anchor. The central concept is that the bonding area will be fractured when a certain vertical force is loaded on it, and this force can be used as a “standard”. This test is easy to be carried out. It also can be used in in-situ bonding quality monitoring in MEMS fabrication. Edge effect, the length of the bonding area partly determines the bonding strength, is found in micro-scale bonding. The coefficients of the edge effect, which determine the bonding strength at the interface of the bonding are, are calculated. Designers can use the equations and the coefficients to design the bonding areas according to the requirement of bonding strength for their devices or the appropriate test structures for the bonding quality in-situ monitoring.

scholarly journals Physical properties and bonding quality of laminated veneer lumber produced with veneers peeled from small-diameter rubberwood logs

2019 ◽  
Vol 6 (12) ◽  
pp. 191763 ◽  
Author(s):  
P. S. Khoo ◽  
K. L. Chin ◽  
P. S. H'ng ◽  
E. S. Bakar ◽  
C. L. Lee ◽  
...  
Keyword(s):  
Phenol Formaldehyde ◽  
Small Diameter ◽  
Lower Grade ◽  
Bonding Quality ◽  
Laminated Veneer Lumber ◽  
Short Rotation ◽  
Different Temperatures ◽  
Lamination Process ◽  
Lathe Check

The peeling of small-diameter rubberwood logs from the current short-rotation practices undoubtedly will produce lower grade veneers compared to the veneers from conventional planting rotation. Hence, this raises the question of the properties of the produced laminated veneer lumber (LVL) from veneers peeled from small-diameter rubberwood logs using the spindleless lathe technology. Different thicknesses of rubberwood veneers was peeled from rubberwood logs with diameter less than 20 cm using a spindleless lathe. Three-layer LVLs were prepared using phenol formaldehyde (PF) adhesive and hot pressed at different temperatures. During the peeling of veneer, lathe checks as deep as 30–60% of the veneer thickness are formed. Owing to deeper lathe check on 3 mm rubberwood veneer, higher pressing temperature significantly increased the gluebond shear strength of the PF-bonded LVL. In addition, lathe check frequency was also shown to influence the bond strength. The presence of higher lathe check frequency on 2 mm veneer increased the wettability, thus facilitating optimum penetration of adhesive for stronger bonding. These findings stress the importance of measuring and considering the lathe check depth and frequency during the lamination process to get a better understanding of bonding quality in veneer-based products.

scholarly journals Influence of natural surface ageing on bonding quality of thermally modified oak and beech wood

2019 ◽  
Vol 70 (3) ◽  
pp. 273-278
Author(s):  
Vjekoslav Živković ◽  
Gustav Gabrek ◽  
Goran Mihulja
Keyword(s):  
Contact Angle ◽  
Shear Strength ◽  
Wood Species ◽  
Contact Angles ◽  
Bonding Quality ◽  
Natural Surface ◽  
Lamination Process ◽  
Thermally Modified Wood ◽  
Modified Wood

This paper presents the influence of natural surface ageing in indoor conditions on bonding quality of thermally modified wood used in structural laminated products. Two unmodified and thermally modified wood species were used for the experiment: oak and beech. Samples were planed and glued with MUF adhesive 2 hours, 1, 2, 6, 10, and 18 days after planing. Properties of laminated beech and oak beams, namely shear strength, delamination and contact angle, were measured in order to detect 1) suitability of wood species for lamination process and 2) influence of extended storage time after planing on properties of laminated wood. Generally, both native and thermally modified beech exhibited better results of shear strength and delamination and had lower contact angles compared to oak and thermally modified oak. Results of the delamination test (total delamination) indicate time dependence of surface ageing. Both unmodified and thermally modified beech may be successfully laminated at least up to 2 days after planing, whereas neither oak nor thermally modified oak are suitable for lamination process due to excessive delamination. Results of delamination may be related to contact angle measurements. Shear strength of glue lines did not show any influence on natural surface ageing. However, whereas beech and thermally modified beech samples exhibited almost the same values of the shear strength regardless of the duration of surface ageing, there is an obvious difference in shear strength of oak and thermally modified oak samples.

Plasma treatment of plastic film or decorative veneer and its effects on the peel strength and curling deformation of plastic film-reinforced pliable decorative sliced veneer (PR-RP-DSV)

Holzforschung ◽  
2019 ◽  
Vol 73 (3) ◽  
pp. 313-322 ◽  
Author(s):  
Xiaorui Peng ◽  
Zhankuan Zhang
Keyword(s):  
Bonding Strength ◽  
Peel Strength ◽  
Surface Finishing ◽  
Great Decrease ◽  
Plastic Film ◽  
Interface Bonding ◽  
Pressing Time ◽  
Product Surface ◽  
New Type ◽  
Interface Bonding Strength

AbstractA new type of plastic-film-reinforced pliable decorative sliced veneer (PF-RP-DSV) for wood product surface finishing was developed. The plastic film served as both the reinforcing and adhesive material. Consequently, the veneer did not need adhesives during preparation and wood surface finishing. However, the interface bonding strength between the two composite was low and the curling deformation was serious because of the large difference in polarity and thermal expansion coefficient of the two materials. In this paper, low-density polyethylene (LDPE) plastic film (PF) and a decorative sliced veneer (DSV) fromBrachystegia laurentiiwere treated with plasma to improve interfacial adhesion and reduce curling deformation. The plasma-modified (PM) PF and DSV increased the bonding strength of the resulting composites and generated an evenly distributed quasi glue layer between the two materials. The PM-PF had more influence on the interface bonding strength than the PM-DSV. This effect can be attributed to the great decrease in crystallinity and increment of oxygen-containing functional group in the PM-PF. The veneer fromB. laurentiican achieve good gluing performance and small curling deformation at a hot pressing temperature of 120°C, pressing time of 150s and pressing at 0.6 MPa.

scholarly journals Supporting Caregivers of Older Adults Through Education in Mindful Gratitude Practice

2020 ◽  
Vol 4 (Supplement_1) ◽  
pp. 16-16
Author(s):  
Sungsim Lee
Keyword(s):  
Older Adults ◽  
Negative Impact ◽  
Well Being ◽  
Positive Influence ◽  
Mindfulness Practice ◽  
Practice Research ◽  
Relevant Research ◽  
Won Buddhism ◽  
The Relationship

Abstract This presentation describes a supportive mindfulness practice for caregivers of older adults based on the principles of Won Buddhism (an integrative, a modernized Buddhism). As the aging population grows, there is a significant increase in recognition of the negative impact of caregiver stress on older adults’ quality of life. The ability for caregivers to deal compassionately with stress is essential, as caring for older adults can awaken feelings about one’s own vulnerability and mortality. The ‘Mindful Gratitude Practice’ offers a way to cope with stress, cultivate self-care, and improve the care of others. Relevant research will be summarized, which shows mindfulness and gratitude practice respectively benefit positive influence in both physical and emotional well-being. Mindful Gratitude Practice as a spiritual approach that fosters caregivers' emotional stability, reduces their stress and improves the relationship between older adults and their caregivers. In this presentation, three processes of Mindful Gratitude Practice will be described: 1. Understanding a mindfulness practice by establishing intention, attention, and attitude, 2. Learning the principles of a gratitude practice and implementation, and 3. Incorporating mindfulness into a gratitude practice. Research results have demonstrated that through this learning process, caregivers have acquired the concept of interconnectedness, experience grateful moments, and a deep feeling of appreciation in their caregiving relationships. The presenter will guide participants in a short experience of Mindfulness Gratitude Practice. Further readings and resources will be provided for those who are interested.

scholarly journals Publication by association: how the COVID-19 pandemic has shown relationships between authors and editorial board members in the field of infectious diseases

2021 ◽  
pp. bmjebm-2021-111670
Author(s):  
Clara Locher ◽  
David Moher ◽  
Ioana Alina Cristea ◽  
Florian Naudet
Keyword(s):  
Infectious Diseases ◽  
Evidence Based Medicine ◽  
Medical Community ◽  
Board Members ◽  
Evidence Based ◽  
Ripple Effect ◽  
New Type ◽  
Based Medicine

During the COVID-19 pandemic, the rush to scientific and political judgements on the merits of hydroxychloroquine was fuelled by dubious papers which may have been published because the authors were not independent from the practices of the journals in which they appeared. This example leads us to consider a new type of illegitimate publishing entity, ‘self-promotion journals’ which could be deployed to serve the instrumentalisation of productivity-based metrics, with a ripple effect on decisions about promotion, tenure and grant funding, but also on the quality of manuscripts that are disseminated to the medical community and form the foundation of evidence-based medicine.

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