Monday, September 3, 2012

Modular Garments Production System

Modular Garments Production System 
There are so many popular apparel garments production systems, such as


-Progressive bundle system
-Unit Production System
-Modular Garments Production System
-Combined garments Production System
A modular garments production system is a contained, manageable work unit that includes an empowered work team, equipment, and work to be executed. Modules frequently operate as minifactories with teams responsible for group goals and self-management. The number of teams in a plant varies with the size and needs of the firm and product line in garments. Teams can have a niche function as long as there are orders for that type of garments product, but the success of this type of garments operation is in the flexibility of being able to produce a wide variety of products in small quantities in garments.

Many different names are currently used to identify modular garments production systems, including modular garments manufacturing, cellular garments manufacturing units, compact work teams, flexible work groups, self-directed work teams, and Toyota Sewing System (TSS) in garments. The basic premise is similar among these production systems, although the organization and implementation may vary.

The number of employees on a team, usually 4 to 15, varies with the product mix. A general rule of thumb is to determine the average number of operations required for a style being produced and divide by three. Team members cross-trained and interchangeable among tasks within the group. Incentive compensation is based on group pay and bonuses for meeting team goals for output and quality. Individual incentive compensation is not appropriate for team-based garments production. Teams may be used to perform all the operations or a certain portion of the assembly operations depending on the organization of the module and processes required. Before a firm can establish a modular production system, it must prioritize its goals and make decisions that reflect the needs of the firm.

With a team-based system operators are given the responsibility for operating their module to meet goals for throughput and quality. The team is responsible for maintaining a smooth work flow, meeting production goals, maintaining a specified quality level, and handling motivational support for the team. Team members develop an interdependency to improve the process and accomplish their goals. Interdependency is the relationship among team members that utilizes everyone's strengths for the betterment of the team.

Work flow in modular garments production
A Modular garments Production System operates as a Pull System, with demand for work coming from the next operator in line to process the garment. Wastage is normal, and workflow is continuous and does not wait ahead of each operation. This increases the potentials for flexibility of styles and quantities of products that can be produced. Teams usually operate as ‘Stand-up’ or ‘Sit-down’ units.

A module may be divided into several work zones based on the sequence of garments operations and the time required for each operation. A work zone consists of a group of sequential garment operations. Operators are trained to perform the operations in their work zone and adjacent operations in adjoining work zones so they can move freely from one operation to another as the garment progresses.

Work flow within a module may be with a Single-piece hand-off, Kanban, or Bump-back system. If a single-piece hand-off is used, machines are arranged in a very tight configuration. As soon as an operation is completed the part is handed to the next operator for processing. Operations need to be well balanced as there is usually only one garment component between each operation. Some modules may operate with a buffer or small bundle of up to ten pieces of work between operators. If a small bundle is used, an operator will complete the operation on the entire bundle and carry the bundle to the next operation. An operator may follow a component or bundle for as many operations as they have been trained or until the adjacent operator is ready to assume work on the bundle.

A Kanban uses a designated work space between operations to balance supply with demand. The designated space will hold a limited number of completed components (two or three) in queue for the next operation. If the designated space is full, there is no need to produce more until it is needed or the space empties. This limits build up of product ahead of the next operation. When the space is full the operator can assist with other operations that may be slow.

The bump-back or TSS (Toyota Sewing System) approach was developed by the Toyota Sewn Product Management System and is probably the most widely used type of team-based manufacturing. It is a stand-up module with flexible work zones and cross-trained operators. Operators may be cross-trained on up to four different successive operations. This enables operators to shift from operation to operation until the next operator is ready to begin work on the garment. The operator needing work steps to the beginning of the zone and takes over the processing at whatever point it is in the production process. The operator who has been relieved of the garment will then move back to the beginning of the work zone and take over work on another garment. This approach enables continuous work on a garment and allows each operator to perform several different operations. This arrangement frequently uses a 4-to-l ratio of machines to operators.

Advantages of a Modular Garment Production System are:
1.) High flexibility
2.) Fast throughput times
3.) Low wastages
4.) Reduced Absenteeism
5.) Reduced Repetitive Motion Ailments
6.) Increased employee ownership of the production process
7.) Empowered employees
8.) Improved Quality

Disadvantages of Modular Garments Production System:
1.) A high capital investment in equipment.
2.) High investment in initial training.
3.) High cost incurred in continued training

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Progressive Bundle System of Apparel garments production

 of apparel garments manufacturing could be summarized :
There are so many popular apparel garments production systems, such as


-Progressive bundle system
-Unit Production System
-Modular Garments Production System
-Combined garments Production System

The progressive bundle system (PBS) of apparel garments production gets its name from the bundles of garment parts that are moved sequentially from operation to operation. This bundle system, often referred to as the traditional garments production system, has been widely used by garments manufacturers for several decades and still is today. The AAMA Technical Advisory Committee (1993) reported that 80 percent of the apparel manufacturers used the bundle system of garments production. They also predicted that use of bundle systems for garments production would decrease as firms seek more flexibility in their production systems.

Bundles system of apparel production consist of garment parts needed to complete a specific operation or garment component. For example, an operation bundle for pocket setting might include shirt fronts and pockets that are to be attached with garments. Bundle sizes may range from two to a hundred parts. Some firms operate with a standard bundle size of particular garments, while other firms vary bundle sizes according to cutting orders, fabric shading, size of the pieces in the bundle, and the operation that is to be completed. Some firms use a dozen or multiples of a dozen of garments because their sales are in dozens. Bundles of garments are assembled in the cutting room where cut parts are matched up with corresponding parts and bundle tickets.

Bundles of cut parts are transported to the sewing room in the garments and given to the garments operator scheduled to complete the garments production operation. One garments operator is expected to perform the same operation on all the pieces in the bundle, retie the bundle, process coupon, and set it aside until it is picked up and moved to the next operation of garments production. A progressive bundle system of garments production may require a high volume of work in process cause of the number of units in the bundles and the large buffer of backup that is needed to ensure a continuous work flow for all operators in garments.

The progressive bundle system of garments production may be used with a skill center or line layout depending on the order that bundles are advanced through garments production. Each style may have different processing requirements and thus different routing. Routing identifies the basic operations, sequence of garments production, and the skill centers where those garments operations are to be performed. Some garments operations are common to many styles, and at those operations, work may build up waiting to be processed.

Disadvantages of progressive bundle system of garments production:
The progressive bundle system of garments production is driven by cost efficiency for individual garments operations. Garments operators perform the same operation on a continuing basis, which allows them to increase their speed and productivity. Operators of garments who are compensated by piece rates become extremely efficient at one garments operation and may not be willing to learn a new garments operation because it reduces their efficiency and earnings. Individual operators that work in a progressive bundle system of garments production are independent of other operators and the final product.

Slow processing, absenteeism, and equipment failure may also cause major bottlenecks within the system. Large quantities of work in process are often characteristic of this type of garments production system. This may lead to longer throughput time, poor quality concealed by bundles of garments, large inventory, extra handling, and difficulty in controlling inventory of garments industry.

Advantages progressive bundle system of garments production:
The success of a bundle production system of garments manufacturing may depend on how the production system is set up and used in a plant. This production system may allow better utilization of specialized garments production machines, as output from one special purpose automated garments machine may be able to supply several garments machine operators for the next operation. Small bundles of garments allow faster throughput unless there are bottlenecks and extensive waiting between operations.
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Unit Production System of garments manufacturing

Unit Production System of garments manufacturing:
There are so many popular apparel garments production systems, such as


A unit production system (UPS) of garments production is a type of line layout that uses an overhead transporter system to move garment components from work station to work station for assembly. All the parts for a single garment are advanced through the production line together by means of a hanging carrier that travels along an overhead conveyor. The overhead rail garments production system consists of the main conveyor and accumulating rails for each work station of garments. The overhead conveyor operates much like a railroad track. Carriers are moved along the main conveyor and switched to an accumulating rail at the work station where an operation is to be performed. At the completion of an operation the operator presses a button, and the carrier moves on to the next operation.

Most unit production systems of garments production are linked to a computer control center that routes and tracks production and provides up-to-the-minute data for management decisions. The automatic control of work flow sorts work, balances the line, and reduces claims of favoritism in bundle distribution in garments production. Electronic data collection provides payroll and inventory data, immediate tracking of styles, and costing and performance data for prompt decisions.

Processing begins at a staging area in the sewing room of garments. Cut parts for one unit of a single style are grouped and loaded directly from the staging area to a hanging carrier. Loading is carefully planned so minimal handling is required to deliver garment parts in precisely the order and manner that they will be sewn. When possible, garments operations are completed without removing the parts from the carrier. Varied sizes and types of hanging carriers are available for different types of garments products. Automated garments handling replaces the traditional garments production system of bundling, tying and untying, and manually moving garment parts. Unit production systems eliminate most of the lifting and turning needed to handle bundles and garment parts.

The need for bundle tickets and processing operator coupons is also eliminated when an integrated computer system monitors the work of each garments operator. Individual bar codes or electronic devices are embedded in the carriers and read by a bar code scanner at each workstation and control points in garments factory. Any data that are needed for sorting and processing such as style number, color shade, and lot can be included.

Integrated garments production systems have on-line terminals located at each work station to collect data on each operation. Each garment operator may advance completed units, reroute units that need repair or processing to a different station of garments, and check their efficiencies and earnings. Garments operator may signal for more inventory or call for a supervisor if assistance is needed. The terminals at each station enables central control center to track each unit at any given moment and provide garments management with data to make immediate decisions on routing and scheduling.

Garments operators of the UPS control center can determine sequences of orders and colors to keep operators supplied with work and to minimize change in equipment, operations, and thread colors. A unit garments production system can control multiple routes and simultaneous production of multiple styles without restructuring production lines in garments. The control center may perform routing and automatic balancing of work flow, which reduces bottlenecks and work stoppages. Each operator as well as the control center is able to monitor individual work history. Data can be collected on the amount of time an garments operator works, time spent on each individual unit, number of units completed, the operator who worked on each unit, and the piece rate earned for each unit in garments. The system of garments production will calculate the earnings per hour, per day, and the efficiency rate of each garments operator.

Advantages of Unit Production System of garments production:
Benefits of a unit garments production system depend on how a production system is used and the effectiveness of management. Throughput time in the sewing room can be drastically reduced when compared to the progressive bundle system of garments production because works in process levels are reduced. Garments operator productivity increases. Direct labor costs are reduced because of prepositioned parts in the carriers and elimination of bundle processing. Indirect labor costs may be reduced by elimination of bundle handling and requiring fewer supervisors. Quality is improved because of accountability of all garments operators and immediate visibility of problems that are no longer concealed in bundles for extended periods of time. The central control system in garments production makes it possible to immediately track a quality problem to the operator that completed the operation. Other benefits that are realized are improved attendance and employee turnover and reduced space utilization.

Disadvantages Unit Production System of garments production:
Considerations for installing a UPS include costs of buying equipment, cost of installing, specialized training for the production system, and prevention of downtime. Down time is a potential problem with any of the garments production systems, but the low work in process that is maintained makes UPS especially vulnerable.
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