The production efficiency of diaper machines is determined not only by their own production capacity but also by the types of raw materials used in production. Different raw materials have distinct performance characteristics and prices, which affect both the production cost of products and the material wear and tear during equipment operation. Below, we will introduce and recommend how to select raw materials from the aspects of raw material types, compatibility between raw materials and production equipment, and the impacts of raw materials on production.
I. Types and Cost Characteristics of Raw Materials
Diaper raw materials can be broadly divided into two systems: traditional petroleum-based materials and emerging bio-based materials. The former currently accounts for 80% of the global market, with mature technology and a complete supply chain; the latter is growing rapidly at an average annual rate of 25% and is the core development direction of the industry in the next 5-10 years. There are essential differences between the two in terms of cost structure, performance and market positioning.
1. Core Petroleum-Based Raw Materials
Petroleum-based materials are the absolute mainstream in the industry at present, accounting for 75%-85% of the total cost of diaper products. Their prices are highly correlated with international crude oil prices and show obvious cyclical fluctuation characteristics.
Super Absorbent Polymer (SAP): Known as the "heart" of diapers, it accounts for 35%-40% of the product cost. The average market price in 2026 ranges from $1,700 to $2,600 per ton, with significant price differences among different subtypes: high-absorption-speed SAP is suitable for baby diapers and has a higher price; high-liquid-retention SAP is suitable for adult diapers and night-use products and has a relatively lower price. Its core performance indicators include saline absorption rate ≥50g/g, pressurized liquid retention rate ≥25g/g, and particle uniformity and dust content directly affect production stability.
Non-woven Fabric: Known as the "skin" of diapers, it accounts for 20%-25% of the cost, with a price range of $1,100 to $2,600 per ton. Among them, spunbond non-woven fabric (SS) has the lowest cost and is used for the bottom layer and waistband; through-air bonded non-woven fabric is fluffy and soft, used for the surface layer and acquisition layer; spunlace non-woven fabric has the closest hand feel to cotton and is used for high-end products. Key performance indicators include breaking strength, hydrophilicity and lint shedding rate, which directly affect the skin-friendliness and user experience of the product.
Breathable PE Film: Responsible for leak-proof and breathable functions, it accounts for 8%-12% of the cost, with a price of $1,300 to $2,300 per ton. Ordinary breathable films are used for mass-market products, while high-breathable and ultra-soft breathable films are used for mid-to-high-end products. The core indicators are air permeability and softness.
Hot Melt Adhesive: Used for bonding various layers of materials, it accounts for 5%-8% of the cost, with a price of $2,100 to $3,100 per ton. It is divided into structural adhesive, elastic adhesive and positioning adhesive, which are used for bonding different parts respectively. Peel strength and temperature resistance are key indicators.
Elastic Materials and Fluff Pulp: Elastic materials account for 4%-6% of the cost, including spandex yarn and elastic non-woven fabric, used for elastic fitting of waist and leg cuffs; fluff pulp accounts for 3%-5% of the cost, mainly providing bulkiness and liquid diffusion performance, and imported softwood pulp has better performance than domestic pulp.
In terms of price trends, affected by the geopolitical conflicts in the Middle East in the second half of 2025, petroleum-based raw materials entered a new round of upward cycle. In the first quarter of 2026, hot melt adhesive increased by 20.2% year-on-year, SAP increased by 18.8%, and non-woven fabric increased by 15.3%. In the long run, affected by global overcapacity, prices will remain volatile at high levels.
2. Core Bio-Based Raw Materials
Bio-based materials are made from renewable resources such as corn, bamboo and cotton, conforming to the global carbon neutrality trend, and are mainly targeted at the high-end maternal and infant market and European and American export markets, with a market share of 20% in 2026.
Bio-based SAP: Accounts for 45%-55% of the cost of bio-based products, with a price of $3,600 to $5,700 per ton. It is divided into multiple grades according to different bio-based contents: products with 30% bio-based content have lower prices and performance close to petroleum-based SAP; 100% fully bio-based products are completely biodegradable but have the highest price. Its core advantages are lower skin irritation and better environmental protection.
Bamboo/Cotton Fiber Non-woven Fabric: Accounts for 25%-30% of the cost, with a price of $2,100 to $3,600 per ton. It has the characteristics of natural antibacterial and good air permeability, and is the most accepted bio-based material in the market at present. Among them, bamboo fiber non-woven fabric has strong antibacterial properties, and cotton fiber non-woven fabric has the best skin-friendliness.
PLA/PHA Breathable Film: Accounts for 12%-18% of the cost, with a price of $2,900 to $4,300 per ton. It is completely biodegradable and an ideal material to replace traditional PE films, but it has poor thermal stability and high processing difficulty.
Bio-based Hot Melt Adhesive: Accounts for 8%-12% of the cost, with a price of $3,600 to $5,000 per ton. It is made from soybean oil and rosin, odorless and has good biocompatibility, but has poor thermal stability and is easy to carbonize.
The overall price of bio-based materials is showing a year-by-year downward trend, with a cumulative decline of 40%-50% from 2021 to 2026. It is expected that by 2028, the prices of bio-based hot melt adhesive and non-woven fabric will be basically the same as those of petroleum-based materials; by 2030, the price of bio-based SAP will drop to less than 1.5 times that of petroleum-based SAP, and its market competitiveness will be significantly enhanced.
3. Life Cycle Cost Comparison
Many customers only focus on the direct purchase price when selecting raw materials, while ignoring the hidden costs in the production process and the product premium capacity. Overall, although the purchase price of bio-based materials is 1.5-2.5 times that of petroleum-based materials, their comprehensive profitability is higher due to their strong product premium capacity.
In terms of direct purchase cost, bio-based materials are 50%-150% higher than petroleum-based materials;
In terms of equipment transformation cost, bio-based materials require an additional transformation cost of 5%-15% of the total equipment price;
In terms of production loss cost, bio-based materials are 20%-40% higher than petroleum-based materials;
In terms of maintenance cost, bio-based materials are 30%-50% higher than petroleum-based materials;
In terms of product premium, the selling price of bio-based products is usually 1.5-3 times that of petroleum-based products.
Comprehensive calculation shows that the net profit of bio-based products is 20%-80% higher than that of petroleum-based products, with better long-term profitability.
II. Compatibility Between Raw Materials and Production Equipment
Different raw materials have huge differences in physical and chemical properties, which have different requirements for the structure, precision and control system of equipment. Not all equipment can produce all types of raw materials, which is the core issue that must be clarified first when selecting equipment and raw materials.
1. Petroleum-Based Materials: Universal for All Series of Equipment
After more than 60 years of technological iteration, petroleum-based materials have formed a unified industry standard and are fully compatible with the design logic of all mainstream diaper production equipment. From the oldest mechanical cam machines to the latest ultra-high-speed intelligent production lines, they can directly produce petroleum-based materials without any additional transformation. The process parameters such as temperature, pressure and speed when the equipment leaves the factory are optimized based on petroleum-based materials, and there are mature standards in the industry to follow.
Among them, full-servo high-speed production lines (500-1200 pieces/minute) are the best matching equipment for petroleum-based materials, which can control the overall production loss rate at 3%-5%, and achieve the optimal production efficiency and product quality. Even old mechanical cam machines, although with low production efficiency and high loss rate, can stably produce petroleum-based products and are suitable for small workshop-style production.
2. Bio-Based Materials: Only Compatible with Transformed Full-Servo Production Lines
Bio-based materials generally have the characteristics of low strength, high brittleness, low melting point, poor thermal stability and strong hygroscopicity, which have extremely high requirements for the precision, stability and control system of equipment. Old equipment cannot meet their production needs at all.
Old mechanical cam machines (production speed below 200 pieces/minute): Extremely poor compatibility with bio-based materials, with no transformation value at all. If forced to produce, problems such as frequent material breakage, poor heat sealing and extremely low product qualification rate will occur, making normal production impossible.
Semi-servo production lines (200-400 pieces/minute): Poor compatibility. Although theoretically transformable, the transformation cost is as high as 25%-35% of the total equipment price, and the effect after transformation is not good, with the loss rate still as high as 10%-14%. The cost performance is extremely low, and transformation is not recommended.
Standard medium-speed full-servo production lines (400-800 pieces/minute): Medium compatibility, fully transformable, with a transformation cost of about 15%-25% of the total equipment price. After transformation, it can stably produce most bio-based materials, and the overall loss rate can be reduced to 5%-7%, suitable for customers with limited budgets.
Standard high-speed full-servo production lines (800-1200 pieces/minute): Good compatibility, with a transformation cost of about 20%-30% of the total equipment price. After transformation, it can efficiently produce all types of bio-based materials, and the overall loss rate can be reduced to 4%-6%, which is the mainstream choice at present.
Special full-servo production lines for bio-based materials: Excellent compatibility, all special transformations have been completed when leaving the factory, no additional investment is required, and the overall loss rate can be as low as 3%-4.5%, which is the standard configuration of international high-end brands.
To adapt to bio-based materials, the equipment must undergo the following special transformations: First, upgrade the full-servo multi-stage tension control system to improve the control accuracy to ±2%, solving the problems of low strength, easy breakage and deviation of bio-based materials; second, replace the high-precision temperature control system to improve the control accuracy to ±0.5℃, meeting the requirements of the narrow heat sealing window of bio-based materials; third, upgrade the SAP spreading system, replace the polyurethane screw conveyor and spreading roller, and add dehumidification and particle screening devices to reduce the breakage and agglomeration of bio-based SAP particles; fourth, replace the special hot melt adhesive system, adopt stainless steel glue guns and hoses with polished inner walls, and add automatic cleaning functions to prevent carbonization and blockage of bio-based hot melt adhesive; finally, upgrade the high-efficiency dust removal system to improve the dust removal efficiency to 99.9%, handling a large amount of dust and lint generated by bio-based materials.
3. Detailed Compatibility Requirements for Subsystems
From the perspective of each subsystem of the equipment, there are obvious differences in the requirements for petroleum-based and bio-based materials:
SAP Spreading System: Petroleum-based materials only require a standard screw conveyor plus negative pressure adsorption system; while bio-based SAP particles have low strength, are easy to break and have strong hygroscopicity, requiring polyurethane conveying components and additional dehumidification and screening devices.
Hot Melt Adhesive System: Petroleum-based EVA hot melt adhesive has good thermal stability, and a temperature control accuracy of ±2℃ can meet the requirements; while bio-based hot melt adhesive is easy to carbonize, requiring higher temperature control accuracy and automatic cleaning functions.
Heat Sealing System: Petroleum-based materials have a wide heat sealing window, usually between 120-140℃, and a temperature control accuracy of ±2℃ is sufficient; while the heat sealing window of bio-based materials is only about 10℃, requiring ±0.5℃ high-precision control and independent zone temperature control functions.
Tension Control System: Petroleum-based materials have high strength, and a tension control accuracy of ±5% is sufficient; while bio-based materials have low strength and are very sensitive to tension fluctuations, requiring ±2% high-precision control and multi-stage independent control functions.
Dust Removal System: Petroleum-based materials generate less dust, and a basic dust removal system can meet the requirements; while bio-based materials generate 3-5 times more dust and lint than petroleum-based materials, requiring a HEPA high-efficiency dust removal system and multi-point dust suction devices.
III. Comprehensive Impacts of Raw Materials on Production
The selection of raw materials not only affects product quality and production cost, but also has a profound impact on equipment service life, maintenance cost, production efficiency and product qualification rate. These hidden impacts are often more important than the difference in direct purchase costs.
1. Impacts on Equipment Wear and Service Life
Different raw materials have huge differences in the wear degree of key equipment components, which directly determine the service life and maintenance cost of the equipment.
Cutting and Heat Sealing Systems: The service life of die-cutting knives is 5-6 million times when using petroleum-based materials, but only 2.5-3.5 million times when using bio-based materials, with an increase in wear of 71%-100%; the service life of heat sealing rollers is shortened from 3-5 years to 1.5-2.5 years, with wear doubled. This is mainly because fibers and hard particles in bio-based materials will quickly wear the blade, and carbonized PLA materials will adhere to the surface of the heat sealing roller, requiring frequent grinding.
Conveying and Spreading Systems: The service life of SAP screw conveyors is 5-8 years when using petroleum-based materials, but only 2-3 years when using bio-based materials, with an increase in wear of 150%; the service life of guide rollers is shortened from 8-10 years to 4-6 years, with an increase in wear of 67%-100%. This is because bio-based SAP particles have high hardness and will quickly wear the screw blades, while the rough surface of bio-based non-woven fabric will wear the guide rollers.
Hot Melt Adhesive System: The service life of glue gun nozzles is 1-2 years when using petroleum-based materials, but only 3-6 months when using bio-based materials, with an increase in wear of 200%-300%; the service life of glue hoses is shortened from 2-3 years to 6-12 months, with an increase in wear of 200%. This is mainly because bio-based hot melt adhesive is easy to carbonize, which will block the nozzles and wear the inner walls of the glue hoses.
Transmission and Support Systems: The service life of bearings is 2-3 years when using petroleum-based materials, but only 6-12 months when using bio-based materials, with an increase in wear of 200%-300%; the service life of servo motors is shortened from 10-15 years to 7-10 years, with an increase in wear of 50%-71%. This is because a large amount of dust generated by bio-based materials will enter the bearings and transmission system, leading to lubrication failure, and the motors need frequent speed regulation, accelerating aging.
Overall, the use of bio-based materials will shorten the average service life of key equipment components by more than 50% and increase annual spare parts costs by 100%-150%. However, through special transformation, these negative impacts can be reduced by more than 60%, greatly extending the equipment life.
2. Impacts on Production Efficiency and Product Quality
The stability of raw materials and their compatibility with equipment directly determine the operating efficiency of the production line and the product qualification rate.
When using petroleum-based materials, the equipment operates very stably, with a failure rate ≤1%, mean time between failures (MTBF) ≥200 hours, effective operating time ≥95%, product qualification rate ≥98.5%, and overall production loss rate of only 3%-5%.
If using unmodified standard equipment to produce bio-based materials, the equipment failure rate will soar to 3%-5%, MTBF will be shortened to less than 50 hours, effective operating time will be only 80%-85%, product qualification rate will be lower than 92%, and overall production loss rate will be as high as 10%-14%. This means 720-1080 more hours of downtime per year than producing petroleum-based materials, equivalent to 30-45 days less production, resulting in millions of yuan in lost output value.
After special transformation for bio-based materials, the equipment operating status will be significantly improved, with the failure rate reduced to 1.5%-2.5%, MTBF increased to more than 120 hours, effective operating time ≥90%, product qualification rate ≥97%, and overall production loss rate reduced to 4%-6%, which is very close to the level of petroleum-based materials.
3. Impacts on Operating Costs
Taking a standard full-servo production line with a capacity of 600 pieces/minute as an example, we can clearly see the impact of different raw materials on annual operating costs.
When using petroleum-based materials, the annual spare parts cost is about $21,000-$31,000, labor maintenance cost is about $11,000-$17,000, energy consumption cost is about $170,000-$210,000, raw material loss cost is about $210,000-$290,000, and the total annual operating cost is about $420,000-$550,000.
If using unmodified standard equipment to produce bio-based materials, the annual spare parts cost will increase to $51,000-$79,000, labor maintenance cost will increase to $21,000-$29,000, energy consumption cost will increase to $200,000-$260,000, raw material loss cost will increase significantly to$570,000-$710,000, and the total annual operating cost will be as high as $840,000-$1,080,000, more than twice that of petroleum-based materials.
After special transformation for bio-based materials, the total annual operating cost will drop to $510,000-$650,000, only 34%-35% higher than that of petroleum-based materials. The cost of special transformation for bio-based materials is about $210,000-$290,000, and after transformation, it can save $330,000-$430,000 in costs every year, with an investment recovery period of only 6-12 months, which has very high cost performance.
IV. Recommended Combinations of Raw Materials and Equipment
According to the customer's target market, production scale and development plan, we recommend the following optimal combinations of raw materials and equipment:
1. Recommendations by Target Market
Mass Economy Market: Recommend a 100% petroleum-based raw material combination, matched with a standard medium-speed full-servo production line (400-600 pieces/minute), with a single-piece cost of about $0.04-$0.06. The core advantages of this combination are the lowest raw material cost, the most stable supply chain, and no need for any equipment transformation, ready to use, suitable for third- and fourth-tier cities, rural markets and OEM foundries.
Mid-range Quality Market: Recommend a combination dominated by petroleum-based materials with some bio-based surface materials. The equipment selects a medium-to-high-speed full-servo production line (600-800 pieces/minute) and is equipped with an electrostatic elimination device, with a single-piece cost of about $0.06-$0.09. This combination can significantly improve product quality with limited cost increase, meet consumers' demand for "natural and skin-friendly", and is suitable for mass brands and e-commerce brands in first- and second-tier cities.
High-end Maternal and Infant Market: Recommend a combination of high-performance petroleum-based materials with bamboo fiber blended non-woven fabric. The equipment selects a high-speed full-servo production line (800-1000 pieces/minute) and is equipped with an ultrasonic welding system, with a single-piece cost of about $0.09-$0.14. This combination can create obvious product differentiation and strong premium capacity, suitable for high-end maternal and infant brands.
Environmental Protection Export Market: Recommend a combination dominated by bio-based materials with some high-performance petroleum-based materials. The equipment selects a high-speed full-servo production line with special transformation for bio-based materials, with a single-piece cost of about $0.14-$0.21. This combination meets the environmental protection standards of the European Union and the United States, and the product premium can reach 300%, suitable for exporting to European and American markets and international environmental protection brands.
2. Recommendations by Production Scale
Small Factories (daily production capacity below 100,000 pieces): Recommend semi-servo production lines with 100% petroleum-based materials, with small investment and quick results, suitable for start-ups and regional markets.
Medium-sized Factories (daily production capacity 100,000-500,000 pieces): Recommend standard medium-speed full-servo production lines with mid-range raw material combinations, which have the highest cost performance and can balance cost and quality.
Large Factories (daily production capacity above 500,000 pieces): Recommend high-speed full-servo production lines with high-end raw material combinations, which can give full play to the scale effect and reduce unit production costs.
International Brand Foundries: Recommend special bio-based production lines with fully bio-based materials, which can meet the high-end needs of international customers and enhance enterprise competitiveness.
3. Recommendations by Development Plan
Short-term Plan (1-2 years): Prioritize the selection of petroleum-based materials with standard full-servo production lines, which can quickly recover investment and accumulate funds and experience.
Medium-term Plan (3-5 years): Select full-servo production lines with reserved bio-based transformation interfaces to prepare for the future transformation to bio-based products and avoid repeated investment.
Long-term Plan (more than 5 years): Directly deploy special bio-based production lines to seize the first-mover advantage in the future market and establish brand advantages.
V. Comprehensive Selection Suggestions
Prioritize the Upgradability of Equipment: Bio-based materials are an inevitable trend in the future development of the industry. Choosing an upgradable full-servo production line can protect customers' investment in the next 5-10 years and avoid early obsolescence of equipment.
Do Not Choose Inferior Raw Materials for Low Prices: Although inferior raw materials have low purchase prices, they will shorten the equipment life by 50%, double the maintenance cost, and reduce the product qualification rate, which is ultimately not worth the loss.
Quantify Cost Differences: When recommending to customers, do not only compare the direct purchase prices of raw materials, but comprehensively consider production losses, maintenance costs, downtime losses and product premiums, and use life cycle cost data to speak.
Provide a "Equipment + Raw Materials + Service" Package Solution: Establish cooperative relationships with high-quality raw material suppliers to provide customers with one-stop services, reduce customers' procurement risks and technical thresholds, and increase customer stickiness at the same time.
