ISSN:0894-3214    

DOI:10.1002/pts.2770080102

出版商:John Wiley&Sons, Ltd    

年代:1995

数据来源: WILEY

ISSN:0894-3214    

DOI:10.1002/pts.2770080103

出版商:John Wiley&Sons, Ltd    

年代:1995

数据来源: WILEY

ISSN:0894-3214    

DOI:10.1002/pts.2770080104

出版商:John Wiley&Sons, Ltd    

年代:1995

数据来源: WILEY

摘要:

AbstractRe‐cycled polymers can be used for food packaging with a layer of virgin polymer as a functional barrier protecting the food from contamination by material from the re‐cycled layer. A mathematical treatment of the diffusion of the contaminant (initially at a uniform concentration in the re‐cycled plastic) is made by considering the diffusion through the two layers with a constant diffusivity.In order to better define the role of the functional barrier, the case without transfer of contaminant through the external surfaces is considered. Dimensionless numbers are used so as to draw master curves either for the kinetics of contaminant transfer or for the profiles of concentration of contaminant in the material. The efficiency of the functional barrier can be defined by the lag time for the start of migr

ISSN:0894-3214    

DOI:10.1002/pts.2770080105

出版商:John Wiley&Sons, Ltd    

年代:1995

数据来源: WILEY

ISSN:0894-3214    

DOI:10.1002/pts.2770080106

出版商:John Wiley&Sons, Ltd    

年代:1995

数据来源: WILEY

摘要:

AbstractA study of the truck and rail transport environments using racks containing Ford engines was conducted to quantify shock and vibration levels during shipment. Tri‐axial acceleration data was collected at several locations on the floor of the vehicles and on the racks themselves to determine the severity of shock and vibration input from truck trailers and rail boxcars. Power Spectral Density plots were developed from the data collected and used to simulate truck and rail shipments on an electro‐hydraulic vibration table. The results showed that the highest vibration levels in the steel racks occurred at 4 Hz in the vertical direction for truck shipments, and between 12–16 Hz for rail shipments. The vibration levels in the longitudinal and lateral directions were much lower than in the vertical direction for truck shipments. The most severe shock to a rack in rail shipments was 5.7 G peak in the longitudinal direction as a result of cou

ISSN:0894-3214    

DOI:10.1002/pts.2770080107

出版商:John Wiley&Sons, Ltd    

年代:1995

数据来源: WILEY

ISSN:0894-3214    

DOI:10.1002/pts.2770080108

出版商:John Wiley&Sons, Ltd    

年代:1995

数据来源: WILEY

ISSN:0894-3214    

DOI:10.1002/pts.2770080109

出版商:John Wiley&Sons, Ltd    

年代:1995

数据来源: WILEY

ISSN:0894-3214    

DOI:10.1002/pts.2770080101

出版商:John Wiley&Sons, Ltd    

年代:1995

数据来源: WILEY