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Research paper
Abstract
Kanban is a lean tool for pull production system that controls the flow of material between workstations by using kanban signal. During
years, this kanban signal is taking use of new technologies given by industrial revolutions. The latest one described the industry 4.0 as
the industry of the future based on cyber-physical systems. In this context, this paper discusses the functioning of new kanban system for
industry 4.0 environment, called kanban 4.0. At first, the current functioning of kanban system was analyzed and object interactions were
demonstrated. Afterwards, two potential functioning of kanban system within industry 4.0 environment were presented, focusing on po-
tential object roles and interactions, in case when the product is smart and the other one considering the smart bin/container. The pro-
posed functioning was discussed with industrial experts and can constitute a basis for further researches.
Keywords: Industry 4.0; kanban; kanban 4.0; lean manufacturing; lean production system.
cause problems for a traditional kanban system, because it requires Since it publication, the interest is remarkable of industrials and
adjusting the number of cards used as well as updating the infor- researches worldwide. However, until today, there is no agreed
mation contained in kanban cards [10]. definition of industry 4.0 [27]. It can be considered as the fourth
In addition, kanban card system is not suitable for all enterprises, industrial revolution applying the principles of cyber-physical
especially those with fluctuating demand, poor quality production systems, internet and future oriented technologies and smart sys-
processes, or having a relatively wide variety of products [22]. tems with enhanced human-machine interaction paradigms [28]. A
cyber-physical system combines the physical world with the cyber
2.2.2. Electronic Kanban System or E-Kanban System world by embedded computer controlled feedback loops [13]. The
production system is then transformed to a cyber-physical produc-
To get around the traditional kanban limits, the most optimal solu- tion system [15] with radical changes in the execution of opera-
tion is the use of the electronic kanban system, based on a digital tions [28]. In contrast to conventional forecast based on produc-
signal, which offers many advantages over the kanban card system tion planning, industry 4.0 enables real-time planning of produc-
[8]. tion, along with dynamic self-optimization [28].
The electronic kanban system (also referred as e-kanban) is a sig-
naling system that uses a mixture of technology, such as barcodes, 3.3. Industry 4.0 for Lean Production System
RFID (Radio Frequency Identification) and electronic messages
[6], to trigger the movement of materials within a manufacturing Researchers agreed that the industry 4.0 can be integrated in lean
or production facility [6]. By using these technologies, the kanban production system and beyond that improve lean production by
system can be more reliable [7], with few errors in card manage- increased integration of information and communication technolo-
ment and decision making [7]. This kanban system can be inte- gies (ICT) [29]. Hence, the new manufacturing environment will
grated into enterprise resource planning systems (ERP) [10], be characterized by the following four elements:
which contain all the company's information in a centralized data-
base. 3.3.1 Augmented Operator
E-kanban acts as a "command panel", which allows real-time visi-
bility of demand signals and gives an overview of the status of The industry 4.0 environment will enable new types of interac-
each workstation in the system [21]. All transaction-related infor- tions between operators and machines [30] also new mission /role
mation is automatically collected and analyzed at different stages to be accomplished by operator. In fact, the operator will be a
of the manufacturing process to control and make decisions in decisions maker and a problem solver [27] as well as in charge of
relation to the size of production batches, hence the definition of supervision and control of ongoing activities [27, 29] within a
the passage time of the products [7, 21]. reduced time of reaction [29, 31] by using innovative technology.
The e-kanban supports implementing a Pull production system in Therefore, he will be transformed to an augmented operator who
a manufacturing environment where the traditional kanban system is capable to interact with intangible assets and digital contents in
would face difficulties [7]. It can be used with a production flow highly interactive as well as absorbing fruition experiences [32].
that constantly evolves according to the needs of the customers, as An augmented operator will address the automation of knowledge
the location and the size of each batch is known and the change of which makes it the most flexible and adaptive part in the produc-
the kanban cards takes place automatically in the computer system tion system [33]. He gets an intelligent personal digital assistant
[7], which reacts as a basis for mutual communication [21] with [32], by smart watches [29], the mobile, context-sensitive user
the enterprise stakeholders: customers and suppliers [8]. Quality interface and user-focused assistance systems [34].
problems or failures of the machine are minimized and recovery is Romero et al. [35] present the “operator of the future” or “the
done in a controlled manner [7]. Also, an e-kanban system can operator 4.0” as the smart and skilled operator who performs
bring visibility and improvement of the production and manage- ‘work aided’ by machines if and as needed.
ment of materials into an arrangement where operations are dis-
persed [7]. 3.3.2. Smart Product
In addition, there are still areas where traditional kanban may be
better than e-kanban; this occurs when there is no production in- The role of a product, in the framework of industry 4.0, is changed
formation in the ERP system [8]. from a passive role to an active one [27]; so that the product be-
came smart.
However, while some definitions for smart product exist, it is not
3. The Latest Industrial Revolution: Industry possible to find an agreed upon, generally accepted, and well rec-
4.0 ognized definition of smart products in the literature [36]. Accord-
ing to Rijsdijk and Hultink [37] a smart product is product that
3.1. Industrial Revolutions contain information technology (IT) and that is able to collect,
process, and produce information. In other way, this has a memory
Until today, the industrial environment has known fourth major to store operational data and requirements individually, and is able
revolutions. The first one achieved the mechanization of produc- to request for the required resources and coordinates the produc-
tion using water and steam power; the second industrial revolution tion processes for its completion [38].
introduced mass production by means of electric power; followed
by the digital revolution based on the use of electronics and IT to 3.3.3. Smart Machine
further automate production [25]. Then, the industrial production
According to Alturu et al. [39] a smart machine is defined as “a
is moving from a physical process with IT support to an integrated
machine that knows its capabilities to come up with the most effi-
cyber-physical system of production [26], this characterizes the
cient way to produce a correct part the first time, every time and
fourth industrial revolution, known also as the industry 4.0.
will check and monitor itself using the data to help close the gap
between the designer, manufacturing engineer, and the shop floor”.
3.2. Industry 4.0 It can imply a machine that is better connected, more flexible,
more efficient and safe [40]. Also, it can participate in predictive
In 2011, the approach of industry 4.0 has been presented at the maintenance practices while minimizing its own environmental
Hannover Fair [11, 12]. It was developed in the framework of a footprint and total cost of ownership [40].
project initiated by high-tech strategy of the German government
to promote the computerization of manufacturing [12].
62 International Journal of Engineering & Technology
In addition, a smart machine is able to ensure four levels of intel- priories the production request and to get information on
ligence [41]: Support for humans, repetitive task automation, con- WIP (Work In Progress) level.
text awareness and learning, and self-awareness [41]. Material flow system: the product flow has one way di-
rection; it is transferred from the supplier workstation to
3.3.4. Smart Planner the customer workstation. On the other hand, the full
container/ bin has the same flow direction as the product,
As a result of the connection between the industry 4.0 elements but the empty container circulates in the invers direction.
cited above, the information system can collect data in real time Machine: the kanban signal allows the communication
from suppliers, customers, products, operators and machines, among the adjacent workstations which are connected
analyses them and planes the activities by taking into considera- via material handling equipment.
tion all requirements to be respected such as deadlines and capaci- Each sub-system contains one or more components that must ac-
ties of machines. Therefore, the processes are optimized in nearly complish its defined tasks and interact with others components for
time [29, 31], the planer system is dynamic and the production the functioning of kanban system. The seven identified compo-
system is more flexible. nents are summarized in figure 2 and their interactions are pre-
sented in figure 3.
4. Kanban System Evolution During the In-
dustrial Revolution
While the second industrial revolution, the kanban system was
developed with the idea to control material flow between work-
stations, using material cards (kanban cards).
The evolution of technology proposes bring solution to some kan-
ban cards limitations ,such as the loss of cards and the demand
that must be regular, and gives birth of a new generation of kan-
ban; the e-kanban system based on a digital signal transferred
from workstation to another trough an ERP system based on RFID
technology.
The fourth industrial revolution is based on the cyber-physical
systems. That means that all objects in a manufacturing environ-
ment are interconnected. The kanban system must follow this Fig. 2: Kanban system components
revolution and be transformed to the kanban 4.0 or smart kanban.
Some industrials proposed solution to this transformation; e-
kanban 4.0, which is a combination of electronic kanban, RFID
and the e-ink that replaces the tag that contain the information
related to a container/bin [42]. Other types of kanban was devel-
oped such as kanban bin or iBin (intelligent bin) based on smart
bins (combination of bin and sensors) able to get information on
inventory level, on real time and communicated it to other work-
station [43]. iBin reports wireless the status to an inventory con-
trol system [44].
The following figure summarized the evolution of kanban system
and its relation with industrial revolutions.
The diagram below shows that the operator is the main actor in the
current functioning of kanban system. He visualizes the order
priority and the WIP level on the kanban board. He is also in
charge of reading the kanban signal and send the work order (idem
transfer order) to the production machine (idem material handling
Fig. 1: Kanban evolution equipment) which is responsible to add value to the product (idem
transfer bin/ container or product according to the transfer order).
5. Analysis of Kanban System Functioning in In case of the use of kanban card, the operator is in charge to
transfer kanban card to the supplier/customer workstation. In some
Current Manufacturing Environment case, he will also add value to product as well as to transfer bin/
container or product.
Based on the description of the kanban system given above, we
can identify four primary sub-systems that constitute this kanban
system which are:
6. Potential Kanban System Functioning for
Operator: he is the main actor. He supervises the func- Industry 4.0 Environment
tioning of current kanban system.
Informational system: the kanban signal can be a kanban 6.1. Role of Kanban System Components in the Indus-
card or a digital kanban signal. It has double roles; first try 4.0 Environment
it allows the customer workstation to get information on
the products, and second it orders the production for the In the framework of industry 4.0, the kanban system will be
supplier workstation. A kanban board can be used to changed and transformed to a kanban 4.0 or a smart kanban that
International Journal of Engineering & Technology 63
means that all components cited in Figure 2 should be adapted to 6.2. Potential Object Interactions for the Functioning pf
the new environment. Kanban 4.0
The following table highlights the role/ characteristics of each
kanban system components in the current manufacturing environ- There are two potential functioning of kanban system, the first one
ment as well as its potential role in the industry 4.0 environment. when the product is smart and the second one when the bin is
smart.
Table 1: role/ characteristics of kanban system component in current man-
ufacturing environment as well as in industry 4.0 environment 6.2.1. Case 1: Kanban 4.0 Functioning based on Smart Prod-
Kanban system Role/ characteristics in Potential uct
components current industrial role/characteristics in
environment industry 4.0
In case the product is smart, it will send directly work order to the
environment
Operator Workforce Decision maker
production machine which could response to this order by adding
Supervisor Problem solver value to the product. Idem, smart product will send transfer order
Supervisor and to material handling equipment, so that the product could be
controller of activities moved to next workstation. Otherwise, the product can communi-
Kanban signal Work/transfer order Digital work/transfer cate its operational information with an augmented operator. This
(card/ digital) information order information later receives also information from smart production machine and
Kanban board WIP level information Integrated in the smart material handling equipment. Also, the operator is in charge
Work order priority Kanban system of ensuring the efficiency of the kanban system functioning.
information The following figure shows the interactions between objects in
Production Support for Humans, Autonomous and this case.
machine Repetitive Task automatic add value
operations
Material Handling operation Autonomous and
handling automatic handling
equipment operation
Product Passive role Contain operational
information and
Kanban information
Collect, process and
produce information
Request for required
resources
Coordinates the
production process
Container/ bin Passive role Contain kanban
information
Digital WIP level in
Fig. 4: Kanban 4.0 functioning based on smart product
real time
Basing on the assignment of task to each kanban system compo- 6.2.2. Case 2: Kanban System Functioning based on Smart
nents, we will identify its equivalent in industry 4.0 environment. Bin/Container
The following matrix shows the correlation between kanban sys-
tem components and industry 4.0 environment, using as scale: In this case, the work order (idem transfer order) can be sent by
White case: no correlation smart bin/container/packaging to smart production machine (idem
Gris case: high correlation smart manufacturing handling equipment) which will then add
value to product (idem transfer bin/container/packaging).
Table 2: correlation matrix between kanban system components and in- The augmented operator will receive information from smart pro-
dustry 4.0 environment duction machine, smart MHE as well as smart
bin/container/packaging, and then he will react on any object in
Industry 4.0 environment
the kanban system, to ensure the efficiency of the kanban system
Kanban system Augmented Smart Smart
components operator machine product
functioning.
Operator The following figure shows the interactions between objects in
Machine this case.
Kanban signal
(card/digital)
Kanban board
Product
Container/bin
Material handling
equipment
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International Journal of Engineering & Technology 65