The decision of whether to perform manual waste stripping or automatic stripping following die cutting is based on volume, complexity of the product, labor availability, batch size, and the amount of scrap that is still attached to the finished blank. A fast platen die cutter can be used by a plant and the loss of capacity can result because operators may not quickly or consistently clear waste and keep the next stage fed. Manual stripping is still effective where volumes are smaller and the layout is simpler, and where job changes are frequent. The value of automatic stripping increases when waste removal is the limiting factor, requires several people to remove the waste, causes quality differences, or results in an unfinished pile that delays the folding, gluing or packing.
What Is Waste Stripping After Die Cutting?
When a flat sheet is removed from the die-cutting station the finished blank is sometimes still attached to edge trim, internal windows, handle cutouts or other scraps. The removal of the above mentioned pieces is a separate step, called waste stripping, and allows the blank to glide smoothly into the subsequent steps of folding, gluing, packing or further processing. The challenge of this step is dependent on the layout of the dies, their number and dimensions, the caliper of the board, the coating on the sheet, and how the stripping tools (or the hands) engage the board.
The Difference Between Die Cutting and Waste Removal
Stripping becomes difficult due to small internal pieces, narrow bridges and long waste strips and dense layouts. Products that have numerous closely spaced cutouts need to be handled more carefully, and pose a greater potential risk of incomplete removal or edge damage. Whether the sheet is small or large, or the die cutter has only a certain speed, the decision should be made based on the actual die layouts that are running in the plant.
Why Waste Geometry Matters
The usual manual process is to have die-cut sheets exit the delivery pile and transferred to a stripping table or area. They use operators to remove blanks and edge waste and internal scrap, check for defects or missing components and place product in stack for next operation. Often hand trucks or simple conveyors are used for material handling from the die cutter to the stripping station. The process is scalable and time consuming if layouts are complicated or volume increases.
Manual Waste Stripping: How the Process Works
Manual stripping works well for low-to-moderate volumes, short runs, simple product designs and plants that change jobs frequently. When multiple carton styles are being produced in relatively small volumes, a converter can save on the cost and time of dedicated stripping tools by using a converter that can handle several carton styles. In such situations, the manual approach is often the safer bet due to availability of labor and flex scheduling.
Where Manual Stripping Can Be Effective
Labor requirements vary depending on the size of the sheet, the variety and complexity of the waste, the type of board and the quantity produced. Clean, straight edges may require only one operator for a simple one-up carton. Many internal cutouts may make a multi-up layout one or two people to keep up with the die cutter. Further costs, such as moving piles, sorting mixed blanks, removing scrap and re-inspecting damaged blanks are a cost that is easy to overlook when working out the actual stripping cost.
Manual Labor and Handling Requirements
Most common problems are inconsistencies in quality, operator fatigue, product damage, mixed piles and piling of unprocessed sheets. These are all good indicators that manual capacity is being reached; such as piles of die-cut blanks in need of labour; piles of finished blanks awaiting inspection; overtime on the stripping bench; increased scrap rates and slowing the die cutter to match the speed of the downstream line.
Common Problems With Manual Waste Removal
After the cutting and creasing station, an automatic stripping system is used to remove waste with special tools and machine movements. Depending on the design of the machine, this may be arranged in various ways. The system will minimise hand separation but requires proper tooling, setup and maintenance training and skilled operators to operate.
Automatic Waste Stripping: What Changes in the Process?
An automatic stripping system uses dedicated tooling and controlled machine motion to separate waste after the cutting and creasing station. The exact arrangement varies by machine design. The system reduces the amount of hand separation required, but it still needs correct tooling, careful setup, routine maintenance and trained operators.
Integrated Stripping and Separate Stripping Operations
A few machines have a section for stripping immediately following the platen. Others use a separate stripping unit from the die cutting unit. The integrated designs minimize intermediate handling and movement on the floor. Separate units are more flexible but will include transfer time and another process step. The decision will impact on investment, continuity of workflow and time from die-cut sheet to finished blank.
Stripping Tooling and Setup
Automatic waste removal requires the use of stripping boards, pins, frames or the upper/lower tools that are matched to the product. Whether or not waste is removed without harming the blank depends on the quality of the tool and its accuracy. Usually takes longer to prepare these tools for a new job than to just assign operators to a manual table. The expected run length needs to be considered to balance the cost of that setup.
What Automatic Stripping Can Improve
If the product, tooling and machine configuration is right, automatic stripping can help to reduce direct labour, maintain flow continuity, provide better stack quality and provide cleaner blanks to downstream operations. The benefits of these come only with the right system setup and when the volume amassed is worth the preparation effort. They do not come automatically.
Manual vs Automatic Stripping: The Main Production Differences
The practical differences are reflected on labour, throughput, quality, flexibility, setup, and total operating cost.
| Factor | Manual Stripping | Automatic Stripping |
| Labor | Direct operators for separation, inspection and stacking; scales with complexity | Operators mainly for setup, monitoring, tool changes and quality checks |
| Throughput | Limited by operator speed and fatigue; can lag behind die-cutter output | More continuous when tooling is correct; still affected by setup and stops |
| Quality consistency | Varies with operator skill and fatigue | More repeatable when tools are well designed and maintained |
| Flexibility | High for short runs and varied products | Lower; requires product-specific tooling |
| Setup time | Minimal for new jobs | Higher; tool preparation and alignment needed |
| Investment & maintenance | Lower capital; ongoing labor cost | Higher equipment and tooling cost; scheduled maintenance required |
Labor and Staffing
Manual stripping consumes direct labor that rises with waste complexity and volume. Automatic systems still need people for setup, monitoring and quality control, but they free operators from repetitive separation work once the job is running.
Throughput and Workflow Continuity
Measures of blanks after being finished and not just sheets passed through the die cutter per hour. Often manual stripping is the limiting factor that forces the upstream machine to slow down or results in big work in process piles. When the tooling is compatible with the product, automatic stripping can fill that gap.
Quality and Product Damage
The danger of manual work is that it may not be done consistently, edges may be torn and scrap may be lost. Pressure, timing or tool design can damage blanks if automatic systems are used. Sample checks and process control are necessary for both methods and quality risk is not inherent.
Flexibility and Product Changeover
When products are frequently changed, manual methods are preferred since there is no need for special tools. Automatic stripping is more suitable for stable, repetitive jobs that have a good quantity.
Investment, Maintenance and Training
There is high capital, tooling and maintenance cost and operator training for automatic stripping. Low direct labor cost and less delays in the downstream if the utilization rate is high enough.
When Manual Stripping Is Still the Better Choice
For many packaging plants, manual stripping is still the appropriate method. It saves on unwarranted investment when volumes are small, product line is complex, and layouts are straightforward.
Short Runs and Frequent Product Changes
Different stripping tools will be required for each new job. The preparation of these tools may take longer and be more expensive than the manual labor used to prepare the batch. When considering the full job cycle (including changeover), it is sometimes more advantageous to maintain the job manual.
Simple Product Layouts and Limited Waste
Few internal cutouts or easily separable edge waste offer any benefit to automation. The only way to be sure of the value of automatic tooling is to test the sample in the actual board and layout.
Low or Irregular Production Volume
The longer the machine or tooling is not used, the less it is worth investing in. Repeat-order frequency, and annual volume have more significance than one big order.
When Automatic Stripping Becomes Worth Considering
Upgrade signals are issued when measurements indicate that waste removal is causing the whole system to be limited.
Waste Removal Is Slower Than Die Cutting
Operators can’t get ready to clear the die-cut sheets fast enough. Work in process piles increase, folding or gluing stations maintain queues and the die cutter might need to operate sub-optimally. The real difference can be seen when the time taken to get from die-cutting to finished stripped blanks is measured.
Labor Cost Is Rising or Staffing Is Unstable
Manual stripping’s real cost is increased by wage increases, overtime, absenteeism and turnover. The specific wages spent on waste removal per year (for training and quality inspection) provide a better idea than general wages.
Product Complexity Is Increasing
Consistent manual work is harder with windows, handles and dense cutouts and difficult waste geometries. Automatic tooling designs that properly utilize automatic tools can enhance control; however, some automatic tooling designs may require additional hand finishing steps.
Output and Quality Requirements Are Becoming More Demanding
A reliable flow of stripped product becomes more valuable due to smaller deliveries, better blanks, and fewer defects. The most compelling argument is rejection, rework and delay data.
How to Evaluate the Upgrade Economically
An industry average is not used for a structured comparison – the plant’s own figures are used.
Calculate the Current Manual Stripping Cost
Include the number of operators, hours per shift, wage and overtime rates, annual working days, average stripping output, rework and damage cost, scrap handling, work-in-process movement and any delays which affects the folding, gluing and packing.
Estimate the Full Automatic Stripping Investment
Consider equipment, stripping tools, installation, commissioning, training, spare parts, maintenance, floor space changes and any upstream and/or downstream modification that may be necessary. If included in a new die cutter, consider the cost difference between configurations, instead of a stripping section cost.
Compare Net Output Instead of Theoretical Speed
Count out saleable stripped blanks per hour. Consider set-up, tool change, stop, pile change, quality control and operator intervention. The figure for cutting speed alone is not relevant.
Consider Utilization and Future Production
Automatic stripping is more valuable when you have repeat jobs or multiple shifts that are performed in the same manner. Predict utilization for an entire year, including projected volume growth and the labor trends in the next 3-5 years without the benefit of being overly optimistic about peak usage.
Product and Tooling Factors That Affect Stripping Performance
Success is as much the result of the product and tools as it is the product and method selected.
Number and Size of Internal Cutouts
Additional small internal pieces and windows add to difficulty. If waste is tightly packed, it is often necessary to use special tools and controlled motions to remove it. Samples are still necessary on the real site.
Board Type, Caliper and Coating
Paperboard, coated board and corrugated materials do not separate the same way. Tearing and edging quality are affected by stiffness, fiber direction, thickness and surface coating. Test board that represents current production lots, don’t take samples for granted.
Die Layout, Bridges and Waste Connections
The quality of separation of waste is significantly influenced by the design of the bridge. If bridges are not in the right position or are too large, there can be a residual connection that requires additional manual cleanup or results in torn margins. These are minimized by coordinating the packaging design, die making and the machine team.
Stripping Tool Design and Maintenance
The tool needs to be properly designed, aligned and maintained on the machine. Repeated faults are caused by worn pins, damaged boards or incorrect clearances. There is no need to abandon the requirement for skilled setup and inspection due to automation.
How to Choose Between D1060, D1060S and D1060SQ
After making an operational decision, the DAIS 1060-series configurations can be adapted to the desired level of automation.
D1060 for Flexible Semi-Automatic Production
The D1060 semi-automatic option is appropriate for plants with a requirement for flexible job scheduling, moderate production and investment control. It is effective in those areas where they can be found and product mix has not become standardized. Actual suitability will depend on size of sheet, board type, layout and output.
D1060S for Higher Automation Requirements
The automatic configuration for the D1060S allows more continuous production and a lesser manual handling of sheets. Where job volume, labour cost and desired workflow warrant the increase from a semi-automatic operation to a fully automatic system, its value becomes evident.
D1060SQ for Integrated Stripping Applications
The D1060SQ is set for automatic die cutting operation, which includes an integrated stripping station. Designed for plants with repeat products, complex waste or higher downstream output targets. Performance of stripping needs to be validated based on the actual product layout and the material.
What Information DAIS Needs to Recommend a Model
Helpful quotation information involves the maximum and minimum size of the sheets, board type and thickness, board layout, board internal cutouts, existing stripping method, required output, number of operators, annual or monthly volume, requirements for stripping integration and destination, electrical standard. By providing these data, a configuration review can be made which matches the application.
Questions to Ask Before Upgrading to Automatic Stripping
- What is the maximum number of operators that can be replaced/reassigned on average jobs?
- Which products have been successfully tested using the suggested tooling?
- What tools do you need to strip and how much does it take?
- What if the removal of waste is challenging or there are bridges?
- Will the required board type, caliper and coating for production be accepted by the system?
- What is the stable production of finished stripped blanks instead of just die-cut sheets?
- How can the damaged or partially stripped products be identified?
- What work must be done for routine maintenance and what are the spare parts?
- Does stripping occur at the same time as the die cutting or is it done on another machine?
- What installation support/training and production trial support is included?
These questions help keep the discussion relevant with the buyer’s actual products and numbers as opposed to generic automation claims.
Final Guidance: Upgrade When Waste Removal Limits the Production System
Manual stripping is still viable for flexible, lower volume and simpler products. Automatic stripping makes a greater sense when the product complexity and/or the output targets, or downstream delays, result in an identifiable labor constraint that affects the entire line. The key to the right decision is based on total job economics, including labor, tooling, changeover, quality, utilization and maintenance of the die cutter and actual finished stripped output.
Not certain whether manual stripping or automatic stripping is right for your production? Provide DAIS with your product layout, type of board, size of board, and current product production rate and waste removal needs. We can assist you in comparing the D1060, D1060S and D1060SQ configurations for your application.