Tissue360 - Spring/Summer 2017 - 28

Global Yankee Deliveries
By 15-year time periods
600

550

534
513

517

1986-2000

2001-2015

500

450

400

1971-1985

Fig. 5

Regional Yankee Deliveries
By 15-year time periods
300
250

253
229

209

200
150

115

100

99

123

117
109
57

62

50

39

70
16 25

41

0

Europe

Asia

North America

1971-1985

Latin America Africa & Mid- East

1986-2000

2001-2015

Fig. 6

Asian Yankee Deliveries
By 15-year time periods
150
100

99

134

113
95

50
10

0

0

Asia (w/o China)
1971-1985

China
1986-2000

2001-2015

Fig. 7
Regional Yankee Deliveries - 1971 to 2015
Est. Operating Yankees (Asia under-reported)
600

577

500

451

400
288

300

166

200

82

100
0
Europe

Asia

North America

Latin America

Fig. 8
28

delivered with extra thickness (grinding allowance) that will allow 10
to 15 re-grinds, depending on thickness removed with each grinding.
Metallization of gray cast iron yankee dryers first began in the 1980s.
This started as an effort to extend the operating life of yankee dryers
constructed with gray cast iron shells. Metallized spray coatings on
the shell papermaking surface have extended the time between grinds
and have allowed great increases in the useful lifetime of the currently
installed yankee dryers. Many operators believe that the useful life of
yankee dryers with metallized coating can be as long or longer than
several decades.
All welded steel yankee dryers come supplied with a metallized coating
so as to minimize any galling and/or adhesive wear between the doctor
blades and the yankee dryer welded steel shell.
Figure 8 shows regional deliveries from 1971 to 2015. Of interest to
most TAPPI tissue producers is the number of operating machines in
North America:
USA = 263 yankee dryer deliveries/operating machines
Canada = 25 yankee dryer deliveries/operating machines
Mexico = 32 yankee dryer deliveries/operating machines
(Mexico is included in the Latin America totals.)
When analyzing the yankee dryer size information by region, the
only metric that stood out clearly was the average shell face length.
As can be seen in Fig. 9, most regions use yankee dryer cylinders with
approximately 3,200 mm average shell face length. The North America
region is different in that the average shell face length is much greater,
at almost 4,700 mm. North American tissue machines are 47 percent
wider in shell face/tissue sheet width than other global tissue producers.

Tissue360ยบ SPRING/ SUMMER 2017

Africa & Mid-East

RECENT DELIVERIES - CAST IRON VERSUS
WELDED STEEL SHELL MATERIAL
One of the biggest changes to the yankee dryer manufacture has
been the use of welded steel shells as an alternative to the traditional
gray cast iron shells, which started around the early 2000s (Fig. 10).
The analysis will look at deliveries during the 45-year period as well as
deliveries since 2000, a 15-year period broken into five-year intervals.
Cast Iron and Steel Yankee Deliveries Since 1970: Currently, as a
percentage of global operations, there are (approximately) 1,368 cast
iron yankee dryers and almost 196 welded steel yankee dryers. Thus, the
current global population of yankee dryers with gray cast iron shells is
87.5 percent (1,368 of 1,564), and the population of yankee dryers with
welded steel shells is 12.5 percent (196 of 1,564).
Recent Trend: Steel is Growing as a Percent of Yankee Dryer
Deliveries: However, because yankee dryers with welded steel shells
have only been delivered since 2000, it is appropriate to look at the 15-year
period of 2001-2015 when evaluating the two-shell materials. Figure 11
shows the world yankee dryer deliveries during the 2001-2015 period in
five-year intervals. It clearly shows the growing dominance of yankee
dryers with welded steel shells. In the past five-year period analyzed (20112015), the percentage of yankee dryers that were delivered with gray cast
iron shells was 44.5 percent (130 of 292) and the percentage of yankee
dryers delivered with welded steel shells was 55.5 percent (162 of 292).
In North America, the ASME Pressure Vessel code is used in the design
and construction of pressure vessels. ASME Section VIII, Division 1 are
the primary sections of the code that are used in the design and manufacture of yankee dryers. Gray cast iron yankee dryers are manufactured
per ASME Section VIII, Division 1, Part UCI. Welded steel yankee dryers
are manufactured per ASME Section VIII, Division 1, Part UCS.
www.tappi.org


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Table of Contents for the Digital Edition of Tissue360 - Spring/Summer 2017

Setpoint
Tissue Industry News
ST Tissue Launches PM 5 Conversion to Tissue at Virginia Mill
Global Survey Shows Trends in Yankee Dryer Deliveries
How Will the Tissue Connection Between Europe and North America Continue?
St. Croix Tissue: The Strong Newcomer in the US Tissue Business
Sustainability is Central for Sofidel
RISI and TAPPI to Co-Produce Key Tissue Event in 2017
Tissue360 - Spring/Summer 2017 - intro
Tissue360 - Spring/Summer 2017 - cover1
Tissue360 - Spring/Summer 2017 - cover2
Tissue360 - Spring/Summer 2017 - 3
Tissue360 - Spring/Summer 2017 - 4
Tissue360 - Spring/Summer 2017 - 5
Tissue360 - Spring/Summer 2017 - Setpoint
Tissue360 - Spring/Summer 2017 - 7
Tissue360 - Spring/Summer 2017 - 8
Tissue360 - Spring/Summer 2017 - Tissue Industry News
Tissue360 - Spring/Summer 2017 - 10
Tissue360 - Spring/Summer 2017 - 11
Tissue360 - Spring/Summer 2017 - 12
Tissue360 - Spring/Summer 2017 - 13
Tissue360 - Spring/Summer 2017 - 14
Tissue360 - Spring/Summer 2017 - ST Tissue Launches PM 5 Conversion to Tissue at Virginia Mill
Tissue360 - Spring/Summer 2017 - 16
Tissue360 - Spring/Summer 2017 - 17
Tissue360 - Spring/Summer 2017 - 18
Tissue360 - Spring/Summer 2017 - 19
Tissue360 - Spring/Summer 2017 - 20
Tissue360 - Spring/Summer 2017 - 21
Tissue360 - Spring/Summer 2017 - 22
Tissue360 - Spring/Summer 2017 - 23
Tissue360 - Spring/Summer 2017 - 24
Tissue360 - Spring/Summer 2017 - Global Survey Shows Trends in Yankee Dryer Deliveries
Tissue360 - Spring/Summer 2017 - 26
Tissue360 - Spring/Summer 2017 - 27
Tissue360 - Spring/Summer 2017 - 28
Tissue360 - Spring/Summer 2017 - 29
Tissue360 - Spring/Summer 2017 - 30
Tissue360 - Spring/Summer 2017 - 31
Tissue360 - Spring/Summer 2017 - 32
Tissue360 - Spring/Summer 2017 - How Will the Tissue Connection Between Europe and North America Continue?
Tissue360 - Spring/Summer 2017 - 34
Tissue360 - Spring/Summer 2017 - 35
Tissue360 - Spring/Summer 2017 - 36
Tissue360 - Spring/Summer 2017 - St. Croix Tissue: The Strong Newcomer in the US Tissue Business
Tissue360 - Spring/Summer 2017 - 38
Tissue360 - Spring/Summer 2017 - 39
Tissue360 - Spring/Summer 2017 - 40
Tissue360 - Spring/Summer 2017 - 41
Tissue360 - Spring/Summer 2017 - 42
Tissue360 - Spring/Summer 2017 - Sustainability is Central for Sofidel
Tissue360 - Spring/Summer 2017 - 44
Tissue360 - Spring/Summer 2017 - 45
Tissue360 - Spring/Summer 2017 - RISI and TAPPI to Co-Produce Key Tissue Event in 2017
Tissue360 - Spring/Summer 2017 - cover3
Tissue360 - Spring/Summer 2017 - cover4
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