Handern Machinery

Turning Waste into Treasure, Transforming “Stone” into Gold — Vice Mayor of Dangyang Leads Delegation to Wuhan Handern Machinery for Inspection of Phosphogypsum Hollow sheet Production Line

To further promote the resource utilization of industrial solid waste and explore new pathways for the green transformation of the phosphorus chemical industry, a delegation led by the Vice Mayor of Dangyang City recently made a special visit to Wuhan Handern Machinery Co., Ltd. They conducted an on-site inspection of the company's core product—the fully automated phosphogypsum hollow sheet production line—and engaged in in-depth discussions on technological cooperation and industrial implementation.

During the inspection, the delegation visited the production workshop, where they observed a detailed demonstration of the entire production process. This included the pretreatment of phosphogypsum raw materials, automatic batching, high-speed mixing, continuous extrusion molding, and automatic cutting and palletizing.

Technical representatives from Wuhan Handern Machinery systematically explained the core technological advantages of the production line. These include its efficient dehydration and modification process, stable extrusion system design, and mature application enabling a high mixing ratio of phosphogypsum raw materials.

The hollow sheet products produced by the production line have excellent properties such as high strength, light weight, fire resistance, water resistance, and environmental friendliness, and can be widely used in the field of environmentally friendly packaging.

The Vice Mayor pointed out that the comprehensive management and utilization of phosphogypsum is a crucial link for the sustainable development of the phosphorus chemical industry in Dangyang and nationwide. He noted that significant historical stockpiles, high ongoing production rates, and prominent environmental risks pose real challenges.

The phosphogypsum hollow-core slab production line technology from Wuhan Handern Machinery provides a practical and feasible industrial-scale solution for the large-volume and high-value utilization of phosphogypsum. It genuinely achieves "turning waste into treasure" and represents a vivid practice in developing a circular economy.

This inspection was highly fruitful. Not only did we witness advanced technological equipment, but it also strengthened our determination to promote the development of the phosphogypsum resource utilization industry.

He stated that Dangyang City possesses abundant phosphogypsum resources and is in urgent need of such mature and reliable conversion technologies.

He expressed hope that this inspection would serve as an opportunity to strengthen ties with high-tech enterprises like Wuhan Handern Machinery, actively explore cooperation models, and jointly promote the establishment of a phosphogypsum hollow sheet production project in Dangyang. The aim is to cultivate this into a new green engine that solves solid waste challenges, creates economic benefits, and promotes industrial upgrading, thereby injecting strong momentum into Dangyang's ecological civilization construction and high-quality industrial development.

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4 weeks ago | [YT] | 1

Handern Machinery

Stone Paper Production Line and Packaging Bag Applications

I. Product Overview
Stone paper bags are a new type of environmentally friendly packaging material made by compounding calcium carbonate powder (mainly derived from waste materials such as marble quarries) with food-grade environmentally friendly resin (such as PE) through a specific process. Its production process differs fundamentally from traditional plastic woven bags (commonly known as snakeskin bags), possessing different physical properties and environmental characteristics.

II. Objective Analysis of Load-Bearing Performance
According to existing test data, stone paper bags of specific specifications and structures can bear a weight of 30 kg under standard test conditions. This data is based on the following facts:

Specific Test Conditions

This data is typically obtained under standard laboratory conditions (temperature 23±2℃, relative humidity 50%±10%)

The test object is a product of specific specifications (e.g., a three-layer composite structure with a weight within a certain range)

The test method is mostly static load-bearing stability testing

Variable Factors in Practical Applications

Bag Structure: Different numbers of layers, thicknesses, sizes, and sealing processes directly affect load-bearing capacity.

Characteristics of Contents: Sharp objects and irregularly shaped objects have a significant impact on the puncture and abrasion of the bag.

Usage Environment: Environmental factors such as high temperature, high humidity, and ultraviolet radiation can affect material properties.

Handling Methods: Rough handling such as throwing and dragging will reduce the actual service life.

III. Actual Performance Characteristics of Stone Paper Bags
Verified Advantages:

Environmental Protection: Low water consumption during production; the product is recyclable.

Waterproof and Moisture-proof: Barrier to water and water vapor. Good Printability:

Printability: Smooth surface, suitable for high-quality printing

Food Safety: Uses food-grade raw materials, meets relevant contact standards

Characteristics Requiring Objective Understanding:

Material Rigidity: Differences in flexibility compared to traditional woven bags

Cost Factors: Current production costs differ from traditional woven bags

Process Maturity: As a relatively new material, the production process is still under continuous optimization

Market Acceptance: Time is needed to establish a complete supply chain and recycling system

IV. Actual Situation of the Production Line
The stone paper bag production line has the following characteristics:

Technical Principle: Calcium carbonate powder is compounded with resin through processes such as mixing, casting, and stretching.

Energy Consumption Characteristics: The production process does not require a large amount of water, but requires a specific heat energy supply.

Current Production Capacity: The production line efficiency differs from traditional woven bag equipment and is being gradually optimized.

Adaptability: More suitable for producing packaging products of specific specifications and uses.

V. About Wuhan Handern Machinery Co., Ltd.
Wuhan Handern Machinery Co., Ltd. is a world-leading manufacturer of stone paper production lines, capable of providing complete stone paper production lines, and can provide samples and test data. If you have any questions, please feel free to contact us.

WhatsApp: +8613554311083
Tel ​​and Wechat: +8618627187890
Email: handern@handern.com

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4 weeks ago | [YT] | 1

Handern Machinery

Some common choices in stone paper production lines.

For Production Capacity (Tons/Year):

Small Scale: 3,000 - 5,000 tons/year (Suitable for testing the market, initial investment)

Medium Scale: 10,000 - 15,000 tons/year (Most popular for commercial production)

Large Scale: 30,000+ tons/year (For mature market demand)

→ Which range sounds more aligned with your investment plan and market goal?

For Product Use (This decides the formula and process):

Shopping bags / Packaging bags (Most common use, requires good strength)

Printing paper / Notebook covers

Decorative materials / Wall covering

Food packaging (Requires highest grade raw materials and certification)

→ Which application is your primary target?

For Thickness (Micron or mm):

Thin: 80-150 micron (similar to regular paper for printing)

Medium: 200-400 micron (for cards, folders, durable bags)

Thick: 500+ micron (for rigid boxes, special packaging)

→ Do you have a sample or a target product we can match?

Wuhan Handern Machinery Co., Ltd. is a professional manufacturer of stone paper production lines.
Able to provide a complete stone paper production line.
If you have any questions about stone paper, please feel free to contact us.


whatsapp：+8613554311083
Email:handern@handern.com

1 month ago | [YT] | 1

Handern Machinery

What are the types of fluoroplastic films?

Fluoroplastic films, with their unique properties, play a crucial role in numerous high-end and demanding fields.

Main types of fluoroplastic films:

1. PTFE film

Characteristics: Resistant to high and low temperatures (-200°C ~ +260°C), excellent chemical corrosion resistance, extremely low surface energy (non-stick, hydrophobic), excellent dielectric properties and biocompatibility. It can be divided into non-oriented, semi-oriented, and fully oriented films; orientation significantly improves strength and ductility.

Main forms and applications:

Porous/microporous PTFE membranes: Manufactured through a stretching process, possessing a node-fiber microstructure. This is one of the most important forms.

Applications: High-end waterproof and breathable clothing fabrics (such as the core layer of GORE-TEX®), air/liquid precision filtration materials, medical protective equipment, electrolytic cell diaphragms.

Dense/smooth PTFE membranes:

Applications: High-frequency electronic circuit board substrates (such as copper-clad laminates), capacitor dielectrics, gaskets, anti-stick separators.

2. PVDF Film

Characteristics: Excellent weather resistance (UV resistance, radiation resistance), good mechanical strength, piezoelectric/thermoelectric properties, good resistance to common chemicals and oxidants.

Main Forms and Applications:

Single-layer/Multi-layer Co-extruded Film:

Applications: Outer weather-resistant protective film for solar photovoltaic backsheets (one of its core applications), outdoor building protective film.

Piezoelectric Film: Through special polarization treatment, it can convert mechanical energy into electrical energy and vice versa.

Applications: Sensors, acoustic transducers, haptic feedback devices.

Porous PVDF Membrane:

Applications: Water treatment ultrafiltration/microfiltration membranes, lithium battery separator coatings.

3. ETFE Film

Characteristics: Extremely high mechanical toughness (tensile strength up to 3-4 times that of PTFE), light transmittance of over 95%, excellent weather resistance and self-cleaning properties, heat-weldable.

Main Forms and Applications:

Inflatable Membrane Materials for Buildings: Typically manufactured as multi-layered air-cushion structures, inflating to form lightweight, highly transparent roofs or curtain walls.

Applications: Stadiums, airport terminals, botanical garden greenhouses (such as the exterior of Beijing's "Water Cube" and Munich's Allianz Arena). This is the most iconic application of ETFE film.

4. FEP/PFA Films

Characteristics: High transparency (similar to glass), chemical resistance close to PTFE, heat-sealable.

Main Forms and Applications:

FEP Film: Commonly used for windows requiring transparency and corrosion resistance, and solar collector covers.

PFA Film: Due to its extremely high purity, it is mainly used for wafer carriers in semiconductor manufacturing, high-temperature heat-sealing bags, and chemical storage tank liners.

THV Film (Tetrafluoroethylene-Hexafluoropropylene-Vylidene Fluoride Copolymer)

Characteristics: The softest and easiest to process (heat-sealable at low temperatures) among fluoroplastics, while maintaining good chemical resistance and high transparency.

Main applications: Adhesive layers in multilayer composite films, chemical-resistant linings requiring flexibility, and encapsulation films for solar cell modules.

Wuhan Handern Machinery Co., Ltd. produces PVDF/PTFE/ETFE/FEP/PEA production lines, and provides free, feasible solutions.

WhatsApp: +8613554311083
Email: handern@handern.com

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1 month ago (edited) | [YT] | 0

Handern Machinery

Biaxially Oriented Polypropylene (BOPP) and Biaxially Oriented Polylactic Acid (BOPLA) films are core materials in the packaging industry. BOPP is renowned for its excellent gloss, barrier properties, and high clarity, widely used in food, cigarette, and garment packaging. BOPLA, as a bio-based and biodegradable material, is experiencing surging demand driven by global plastic, representing the green future of the film industry.

The core of producing high-performance BOPP and BOPLA films lies in the Biaxial Oriented (BOP) production line. The process mainly includes:

1. Extrusion / Casting:Raw materials are extruded through a precision-designed T-die and formed into an amorphous thick sheet with uniform thickness on a chill roll.
2. Longitudinal Stretching (MD):The thick sheet passes through a series of preheating and stretching rolls with different speeds, achieving a 3.5-5 times stretch in the Machine Direction (MD), aligning the molecular chains.
3. Transverse Stretching (TD):The film enters the tenter frame, where it is gripped by clips on both sides and stretched 8-11 times in the Transverse Direction (TD) under high temperature, forming a stable network structure.
4. Heat Setting & Winding:The stretched film undergoes stress relaxation in the heat-setting zone to improve dimensional stability, finally being cooled, monitored by an online thickness gauge, and wound into mother rolls by a high-precision winder.

Technical Challenges and Innovations:
For BOPP: The key is achieving extremely high line speeds (often exceeding 400 m/min) and uniform thickness control to meet the demands of high-speed printing and lamination.
For BOPLA: Its thermal sensitivity is the main challenge. The production process requires a more precise temperature control window and a gentler stretching profile to prevent film breakage or excessive crystallinity.

Handern Machinery's Solution:
With decades of engineering experience, Handern Machinery provides mature and reliable BOPP/BOPLA biaxial stretching production lines. Our equipment features include:
Customized Temperature Control System: For sensitive materials like BOPLA, we offer a stretching and heat-setting system with precise zonal control, ensuring process stability.
Efficient Crystallization System: Dedicated crystallization and drying equipment for BOPP ensures efficient and uniform raw material treatment.
Intelligent Control: Integration of advanced DCS and online thickness gauges enables fully automatic closed-loop control, guaranteeing a high product A-grade rate.

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3 months ago | [YT] | 0

Handern Machinery

Biaxially Oriented Polyester (BOPET) and Biaxially Oriented Nylon (BOPA) films are high-performance engineering films. BOPET is known for its high strength, high barrier properties, excellent electrical performance, and chemical stability, widely used in magnetic recording, electrical insulation, capacitors, and high-end packaging. BOPA, with its outstanding toughness, puncture resistance, and oxygen barrier properties, is an ideal choice for food preservation and retort packaging.

Although the production processes for BOPET and BOPA are similar to BOPP, they place higher and more demanding requirements on equipment and technology:

Challenges in BOPET Production:
High-Temperature Process: Its melting and stretching temperatures are much higher than BOPP, requiring extruders, dies, and stretching zones to have superior heat resistance and thermal uniformity.
Cleanliness Requirements: For films used in electronics and capacitors, the production line must eliminate impurities and volatiles to prevent film defects.
High-Speed Winding: BOPET lines operate at very high speeds, posing a significant challenge to the tension control and roll shape precision of the winder.

Challenges in BOPA Production:
Hygroscopicity: Nylon raw materials are highly prone to moisture absorption. Therefore, deep drying before extrusion is essential; otherwise, hydrolysis degradation will occur, severely affecting film quality.
Narrow Process Window: The stretching process of BOPA is extremely sensitive to temperature and tension control; minor fluctuations can lead to film breakage or inconsistent properties.

Handern Machinery's Technical Edge:
Addressing these challenges, Handern Machinery has developed cutting-edge solutions specifically for BOPET and BOPA:
High-Temperature Design: Our production lines use special alloys and heating designs to ensure long-term stable operation in the high-temperature environments required by BOPET.
Ultra-Low Dew Point Drying System: The closed-loop low dew point (down to -40°C and below) dryer equipped for BOPA fundamentally solves the raw material moisture issue.
Expert-Level Stretching System: The tenter frame employs multi-zone independent temperature control and micro-tension control systems, providing a stable and controllable stretching environment for BOPA, significantly reducing film breakage rates.
Industry 4.0 Integration: Our production lines enable full-process data monitoring and tracing, providing powerful data support for process optimization and quality control.

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3 months ago | [YT] | 0

Handern Machinery

Biaxially Oriented Polystyrene (BOPS) film is a rigid, transparent, and easily printable packaging material. Due to its excellent stiffness, gloss, and recyclability (PS material), it is widely used in rigid packaging applications such as food trays, chocolate dividers, and cosmetic clamshells. Compared to alternative materials like PVC, BOPS is more aligned with environmental trends.

The production process of BOPS has its uniqueness, primarily adopting the "sequential biaxial stretching" method (MD first, then TD), which differs from the simultaneous stretching common in BOPP. The key points of its process include:

1. Extrusion and Casting: PS resin is melted and extruded through a screw, flowing through a T-die and formed into a thick sheet on a cooling roll. The temperature control of the chill roll is critical for the sheet's crystallinity.
2. Longitudinal Stretching (MD): After preheating, the thick sheet undergoes longitudinal stretching between a few large-diameter stretching rolls. The stretch ratio at this stage is relatively low.
3. Transverse Stretching (TD): This is the key step for BOPS formation. The film enters the tenter frame and undergoes a significant transverse stretch (stretch ratio can reach 4-5 times or more) under high temperature. This process greatly enhances the film's stiffness and strength.
4. Setting and Winding: After heat setting to relieve internal stress, the brittle BOPS film requires precise tension control for winding to prevent cracking or stress whitening.

The Technical Core of BOPS Production:
Thickness Uniformity: As a rigid packaging material, uneven thickness can lead to difficulties in subsequent thermoforming or packaging appearance defects.
Surface Quality: The film surface must be free of gel particles and scratches to meet the visual requirements of high-end packaging.
Energy-Saving Design:BOPS production is energy-intensive. Energy-efficient tenter frames and heat recovery systems can significantly reduce operating costs.

Handern Machinery's Focus and Optimization:
Handern Machinery provides efficient and stable BOPS biaxial stretching production lines. Our advantages are reflected in:
Precision Die and Automatic Feedback: Using a coat-hanger precision die coupled with an online thickness gauge for automatic lip adjustment, ensuring superior full-web thickness uniformity of better than ±1.5%.
Dedicated Tenter Frame Design: Our tenter frame is structurally reinforced for the high-ratio transverse stretching of BOPS and features an optimized airflow field, ensuring stable stretching and energy savings.
Anti-Damage Roller System: The entire line employs specially surface-treated rollers and a low-tension control strategy to minimize damage to the BOPS film surface.
Comprehensive Energy Efficiency Improvement: The system integrates waste heat recovery units, effectively reducing the overall line energy consumption and enhancing customers' ROI.

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3 months ago | [YT] | 0

Handern Machinery

Wuhan Handern Machinery successfully concluded the K Show in Germany, demonstrating its global presence and achieving significant success. Over 175 cooperation agreements were signed, with over 6 equipment purchase agreements concluded.

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4 months ago | [YT] | 0

Handern Machinery

# Germany K Exhibition welcomes you❗️❗️
Hollow sheet - Stone paper - Functional film
Deeply engaged in the plastic machinery industry for over 40 years
Developing over 30 types of plastic machinery

Associate with the strong and walk with the wise!
On-site consultation is in full swing...

Exhibition time and location:8-15 0CTOBER 2025, Dusseldorf, Germany

Exhibition Hall:Hall 12

Booth No.:12C78

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4 months ago | [YT] | 0

Handern Machinery

The 4th "National Industrial By-product Gypsum and New Technology and Equipment Exchange Conference for Comprehensive Utilization of Phosphorus Titanium Gypsum" attracted industry elites from all over the world. Handern Machinery showed the participants the phosphogypsum hollow sheet extrusion line, which can be filled up to 70%, while solving the problem of industrial solid waste and turning chemical solid waste into "green gold".

At the same time, Handern Machinery obtained the "2025 Industrial By-product Gypsum Resource Technology for Industrial Application of High-filled Phosphorus Gypsum Environmentally Friendly Moisture-proof Packaging Materials" Excellent Case Certificate, marking that the phosphogypsum hollow sheet extrusion line technology has officially obtained national authoritative recognition.

Handern Machinery has achieved a phosphogypsum addition ratio of over 70% through original modification technology, while overcoming the two bottlenecks of strength and moisture resistance. Its core process is to convert phosphogypsum into anhydrous gypsum, and after precision grinding and activation modification, it becomes a high-performance filler. This technical path coincides with the exploration of Guizhou Phosphorus Chemical Group and has reached in-depth cooperation. The group has built a 300,000 tons/year anhydrous gypsum production line, which improves the water resistance and wear resistance of the material through high-temperature calcination. Handern Machinery has gone a step further and combined modified phosphogypsum with polymer materials to create a new type of packaging material with excellent performance.

The performance comparison of hollow boards extruded by the phosphogypsum hollow sheet extrusion line is remarkable: compared with ordinary cartons, phosphogypsum packaging boxes have significant waterproof and moisture-proof capabilities, and the compressive strength is increased by more than 30%, which is suitable for high-end scenarios such as cold chain transportation and precision instruments. In terms of environmental benefits, each ton of phosphogypsum can replace 1.3 tons of pulp, greatly reducing deforestation and papermaking pollution.

The benefits of the phosphogypsum hollow sheet extrusion line are clearly visible: The cost of raw materials has been reduced by 30%, and the competitiveness will be further enhanced after scale-up. The product line has been expanded to more than ten categories such as municipal pipes, communication equipment, and degradable ground film. A closed loop of "waste residue-material-application" has been established with leading phosphate fertilizer companies to achieve resource recycling. What is more noteworthy is that the project has been applied for the Hubei Provincial (China) Green Manufacturing Special Project and is expected to be included in the National Resource Comprehensive Utilization Promotion Catalog. Policy support will accelerate the industrialization process.

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7 months ago | [YT] | 0