Sulfur Free Kraft Paper is a special paper that strictly limits the sulfur content during the production process. It is made of kraft paper as the basic material and high-quality wood pulp as the main raw material. It undergoes a series of complex process treatments to ensure that the paper contains no sulfur or has a very low sulfur content. This kind of paper meets high standards in terms of physical strength, chemical stability and environmental performance, and is especially suitable for high-tech industries that are sensitive to sulfur. The production process of sulfur-free kraft paper includes steps such as wood pulp screening, bleaching, beating, papermaking, drying and calendering. The addition of sulfur is strictly controlled in each link to ensure the purity and quality of the final product.

Parameters:

Features:

1. High tensile strength and tear resistance: The tensile strength and tear resistance of Sulfur Free Kraft Paper are important indicators of its physical properties. After professional testing, the tensile strength of this paper can reach more than 650 Newtons and the tear resistance exceeds 28 milli-newton seconds per millimeter. This performance makes it perform well in various application scenarios, especially in environments that require high-strength support and protection.

   
   

2. Low sulfur content and high purity: The core feature of sulfur-free kraft paper is its extremely low sulfur content. During the production process, sulfur-free additives and special bleaching processes are used to ensure that the sulfur content in the paper is less than 10ppm (parts per million), which is far lower than the international standard. This feature makes it particularly suitable for the manufacture of sulfur-sensitive electronic components and photovoltaic cells, avoiding oxidation and corrosion problems caused by sulfur. At the same time, the purity of the paper reaches 99.9%, and the dust and impurity content is extremely low, ensuring reliability in high-precision applications.

   
   

3. Excellent moisture resistance: Sulfur Free Kraft Paper has excellent moisture resistance after special surface treatment. Its water absorption rate is less than 5%, and in an environment with a relative humidity of 80%, the dimensional change rate of the paper is less than 0.5%. This feature enables it to maintain stable physical properties in a humid environment and prevent deformation and strength loss caused by moisture absorption.

   
   

4. Environmental protection and degradability: Sulfur-free kraft paper pays attention to environmental protection during the production process, does not use harmful chemicals, and the paper itself has good biodegradability. Its whiteness is controlled between 55% and 65%, avoiding environmental pollution caused by excessive bleaching. In addition, paper waste can be naturally degraded or recycled, reducing the burden on the environment. This feature meets the requirements of modern industry for sustainable development, giving it a competitive advantage in a market with increasing environmental awareness.

   
   

5. High temperature and chemical corrosion resistance: Sulfur Free Kraft Paper has excellent high temperature resistance and can withstand temperatures up to 180°C in a short period of time without obvious deformation. At the same time, it has good tolerance to a variety of chemicals, such as weak acids, weak bases and organic solvents. This feature enables it to perform well in the manufacturing and packaging of electronic components, and can withstand the high temperature and chemical environment of processes such as welding and cleaning, ensuring the stability and reliability of the product.

Application:

1. Electronic component manufacturing: In the field of electronic component manufacturing, Sulfur Free Kraft Paper is widely used in the lamination and packaging of circuit boards. Its high tensile strength and low sulfur content ensure that the circuit board will not deteriorate due to paper cracking or sulfur corrosion during the lamination process. At the same time, the moisture resistance and dimensional stability of the paper ensure the reliability of the circuit board during transportation and storage. In the manufacture of multi-layer circuit boards, sulfur-free kraft paper as a laminating material can effectively isolate the circuits of each layer and prevent short circuits and oxidation problems.

   
   

2. Photovoltaic cell production: The production of photovoltaic cells requires extremely high purity and stability of materials. Sulfur Free Kraft Paper plays an important role in the processing, grinding and polishing of silicon wafers. Its low sulfur content and high purity ensure that the surface of the silicon wafer will not be oxidized by sulfur, thereby improving the conversion efficiency of photovoltaic cells. In addition, the moisture resistance and high temperature resistance of the paper make it perform well in high-temperature welding and cleaning processes, ensuring the long-term stability of the cell.

   
   

3. Semiconductor packaging: In the field of semiconductor packaging, Sulfur Free Kraft Paper is used to support and protect chips. Its high tensile strength and tear resistance ensure that the chip will not be damaged by paper breakage during the packaging process. At the same time, the low sulfur content and chemical corrosion resistance of the paper enable it to withstand the high temperature and chemical environment in the packaging process, preventing the chip from failing due to sulfur corrosion. During the cutting and forming of the chip, sulfur-free kraft paper as a supporting material can provide uniform support to ensure the accuracy and reliability of the chip.

   
   

4. Precision instrument packaging: Precision instruments have extremely high requirements for the moisture-proof, anti-static and impact-resistant properties of packaging materials. Sulfur Free Kraft Paper has good anti-static and impact resistance through special surface treatment. Its moisture-proof performance ensures that the instrument will not be damaged by moisture during transportation and storage, while its impact resistance protects the instrument from external impact. In the packaging of optical instruments and medical devices, sulfur-free kraft paper as a lining material can effectively absorb impact and prevent damage to the instrument.

   
   

5. Food and pharmaceutical packaging: In the field of food and pharmaceutical packaging, Sulfur Free Kraft Paper is favored for its environmental protection and safety. Its sulfur-free additives and biodegradability make it meet the hygiene standards for food and pharmaceutical packaging. At the same time, the moisture-proof and high-temperature resistance of paper enables it to adapt to the storage and transportation conditions of food and medicine. In the aluminum foil packaging of medicines, sulfur-free kraft paper as the lining material can provide additional moisture-proof and support, ensuring the stability and safety of medicines.

Maintenance:

1. Storage environment control: The storage environment of Sulfur Free Kraft Paper is crucial to its performance and life. Paper should be stored in a dry, cool, well-ventilated warehouse, away from direct sunlight and high temperature. The optimal storage temperature is 18℃ to 24℃, and the relative humidity is 50% to 60%. Too high or too low temperature and humidity will affect the physical properties and chemical stability of the paper.

   
   

2. Moisture and mildew prevention measures: In a humid environment, Sulfur Free Kraft Paper is prone to moisture absorption and deformation, and even mildew. To prevent this from happening, desiccant such as silica gel or activated carbon can be placed in the paper packaging to absorb excess moisture. At the same time, moisture-proof mats should be laid on the warehouse floor, and moisture-proof treatment should be done on the walls and ceiling. Check the paper packaging regularly to see if it is intact, and replace it in time if it is damaged. For long-term storage of paper, it is recommended to turn the pile every once in a while to ensure that each layer of paper is evenly damped.

   
   

3. Avoid heavy objects: During storage and handling, avoid heavy objects directly pressing on Sulfur Free Kraft Paper. Excessive pressure will cause paper deformation and physical strength to decrease, affecting its performance. It is recommended that the height of each stack of paper should not exceed 1 meter, and a pallet should be placed at the bottom of the stack to ensure that the bottom paper is well ventilated. At the same time, there should be enough passages between the stacks for easy handling and inspection. During the handling process, mechanical equipment such as forklifts or cranes should be used to avoid damage caused by manual handling.

   
   

4. Prevent contact with pollutants: The purity of Sulfur Free Kraft Paper is crucial to its application performance. During storage and handling, the surface of the paper should be kept away from pollutants such as oil, acid and alkali substances. Operators should wear clean gloves and use clean tools for handling and packaging. For contaminated paper, it should be isolated in time and cleaning measures should be taken, such as wiping the surface with a clean cloth or using a neutral detergent for cleaning. However, it should be noted that the cleaned paper should be thoroughly dried before storage or use.

   
   

5. Regular inspection and maintenance: To ensure the quality and performance of Sulfur Free Kraft Paper, it should be inspected and maintained regularly. The inspection content includes the appearance, size, strength and purity of the paper. If the paper is found to be deformed, damaged, damp or contaminated, measures should be taken in time to deal with it. For long-term storage of paper, it is recommended to conduct a comprehensive inspection every 3 to 6 months, and adjust the storage conditions or perform necessary maintenance based on the inspection results. In addition, a complete inventory management system should be established to record the storage, outbound and use of paper to ensure that the quality of paper can be traced.