UNCOATED SILICON BASE PAPER BCW/MGK/SCK/CCK ROLL

Product Description

1. The specification for Uncoated BCW/MGK/SCK/CCK Roll and Sheets (40 GSM) typically refers to a variety of paper or board products used in different industries like packaging, printing, or manufacturing. Below is a general outline of specifications that might be applicable for uncoated paper types such as BCW, MGK, SCK, or CCK at a grammage of 40 GSM (grams per square meter).

   1. Paper Type:
   • BCW (Board Coated White): A type of uncoated paperboard, usually used for high-quality packaging.
   • MGK (Machine Glazed Kraft): This is often a smooth, uncoated kraft paper with a glossy finish on one side, commonly used in flexible packaging.
   • SCK (Semi-Chemical Kraft): A type of kraft paper produced with semi-chemical processes; commonly used for a range of industrial applications.
   • CCK (Clay Coated Kraft): A form of kraft paper that has been clay-coated for smoothness and improved printability.
   2. Basis Weight (GSM):
   • 40 GSM (grams per square meter): The weight of the paper, with 40 grams indicating relatively lightweight paper, suitable for specific lightweight applications like packaging, printing, or wrapping.
   3. Thickness/Caliper:
   • The thickness will depend on the fiber content and the specific paper type, but it typically ranges between 0.05 - 0.1 mm for 40 GSM papers.
   4. Surface Texture:
   • Uncoated papers like these usually have a natural finish or slight texture without a glossy layer. This gives a more tactile and natural feel.
     • Machine Side (Glossy side): For MGK, one side may have a slight gloss due to the machine glazing process.
     • Uncoated Side (Matt): The uncoated side is often smoother or more textured.
   5. Brightness and Whiteness:
   • The brightness for these types of uncoated papers can vary depending on the treatment and fiber content. Expect a brightness range of about 75-85%.
   • Whiteness typically ranges between 70-80% for uncoated options.
   6. Color:
   • Most of these uncoated papers are natural or white, but variations can exist depending on the grade and manufacturer.
   7. Strength Characteristics:
   • Tensile Strength: Depending on the type of paper, tensile strength can vary but should meet the needs of general packaging or printing applications.
   • Bursting Strength: Important for packaging materials, generally for these types of paper, bursting strength could range around 1-2 kPa.
   • Tear Resistance: Uncoated papers often have moderate tear resistance, making them suitable for light-duty applications.
   8. Applications:
   • These papers are often used for:
     • Packaging: Light-duty boxes, envelopes, wraps.
     • Printing: Flyers, brochures, and other print materials.
     • Stationery: Letterheads, forms, and other office supplies.
     • Food packaging: For wrapping or bagging lightweight food items.
   9. Roll and Sheet Size:
   • Rolls: Can vary widely but may be offered in typical roll widths like 18", 24", or 36", or custom sizes.
   • Sheets: Standard sizes like A4 (210x297mm), A3, or custom sheet sizes as per customer requirements.
   10. Environmental Properties:
   • Many of these paper types can be made with sustainable sources (FSC or recycled content).
   • Typically, uncoated papers are biodegradable and recyclable.

   If you are referring to specific products, manufacturers may provide more detailed and customized specifications.