Gypsum plasterboard is a building board consisting of building gypsum as the main raw material, and is composed of core materials composed of certain fibers and external forces, and a protective sheet that is firmly combined with this core material. The longitudinal edges covered with paper in the sheet are edges; the edges of the edge of the protective sheet which are not overlapped are frontal; the edges of the edges of the edge of the protective sheet are overlapped; the dimension of the sheet parallel to the edges is the sheet The length of the board; the size of the board perpendicular to the edge is the width of the board; the vertical distance between the front and back of the board is the thickness of the board The user may consider the following aspects when purchasing the identified paper plasterboard.
(1) Shape: The edges of ordinary plasterboards are rectangle (code PJ), 45 degree chamfer (code PD), wedge (code PC), semicircular (code PB) and circle (code PY). ) Five kinds, as shown in Figure 2-9. Different shapes of edges form different surface shapes after being spliced ​​to each other, thus resulting in different decorative effects, and the user should fully consider the overall effect when purchasing.
(2) Size: The size of the plasterboard is shown in the table (2-56)
(3) Product marking: The product marking sequence of the paper gypsum board is: product name, plate edge shape code, board width, board thickness, and standard number. If the edge of the plate is wedge-shaped, the width is 900mm and the thickness of the plain plasterboard is 12mm. Marked as:
Plain plasterboard: PC900*12GB9775
(4) Mark: The manufactured product shall have a quality certificate. The name of the product, the name of the manufacturer, the date of manufacture, and the trademark shall be indicated on the back of each plate.
(5) Inspection of appearance quality: The surface of plain gypsum board should be flat, and for defects such as corrugations, grooves, stains, and scratches, it should comply with the regulations when it is tested according to the prescribed method. Visual inspection should be performed under the conditions of bright light illumination at a distance of 0.5M when the appearance quality is detected.
(6) Size tolerance: If the dimension deviation is too large, it will affect the surface effect after board splicing.
l) length measurement measurement, the box ruler and the gypsum board edge parallel, each board should be measured three length values, that is, each measured 50mm away from each edge, a value measured on the axis of symmetry, record three Length values ​​and calculate the maximum deviation of the length. Such as the length of the 2100mm plate, the length measurement of the three values ​​were 2100mm, 2007mm, 2006mm, the length deviation is 2100mm 2100mm = 0mm, 2006mm-2100mm = -4mm
2) When measuring width, the ruler should be perpendicular to the edges. If the sheet has a chamfer, the width of the sheet should be the back; the width of the sheet as the width of the sheet. Each panel measures three width values, ie the width of each panel as the width of the panel. Each panel measures three widths, one at each end 30 mm away, and one at the axis of symmetry. Record three width values ​​and calculate their maximum deviations.
3) Thickness measurement During the measurement, five measuring points that meet the requirements are arranged equidistantly at the width of each end of each board and measured with a board thickness meter. Record ten measurements and calculate the maximum deviation. Plain plasterboards are mainly used for indoor walls and suspended ceilings, but when used in wet environments where the kitchen, toilets and the relative humidity of the air are often greater than 70%, corresponding dampproof measures must be taken. When purchasing, please pay attention to whether the mark is complete, and whether the appearance quality and size deviation meet the requirements.
(1) Shape: The edges of ordinary plasterboards are rectangle (code PJ), 45 degree chamfer (code PD), wedge (code PC), semicircular (code PB) and circle (code PY). ) Five kinds, as shown in Figure 2-9. Different shapes of edges form different surface shapes after being spliced ​​to each other, thus resulting in different decorative effects, and the user should fully consider the overall effect when purchasing.
(2) Size: The size of the plasterboard is shown in the table (2-56)
(3) Product marking: The product marking sequence of the paper gypsum board is: product name, plate edge shape code, board width, board thickness, and standard number. If the edge of the plate is wedge-shaped, the width is 900mm and the thickness of the plain plasterboard is 12mm. Marked as:
Plain plasterboard: PC900*12GB9775
(4) Mark: The manufactured product shall have a quality certificate. The name of the product, the name of the manufacturer, the date of manufacture, and the trademark shall be indicated on the back of each plate.
(5) Inspection of appearance quality: The surface of plain gypsum board should be flat, and for defects such as corrugations, grooves, stains, and scratches, it should comply with the regulations when it is tested according to the prescribed method. Visual inspection should be performed under the conditions of bright light illumination at a distance of 0.5M when the appearance quality is detected.
(6) Size tolerance: If the dimension deviation is too large, it will affect the surface effect after board splicing.
l) length measurement measurement, the box ruler and the gypsum board edge parallel, each board should be measured three length values, that is, each measured 50mm away from each edge, a value measured on the axis of symmetry, record three Length values ​​and calculate the maximum deviation of the length. Such as the length of the 2100mm plate, the length measurement of the three values ​​were 2100mm, 2007mm, 2006mm, the length deviation is 2100mm 2100mm = 0mm, 2006mm-2100mm = -4mm
2) When measuring width, the ruler should be perpendicular to the edges. If the sheet has a chamfer, the width of the sheet should be the back; the width of the sheet as the width of the sheet. Each panel measures three width values, ie the width of each panel as the width of the panel. Each panel measures three widths, one at each end 30 mm away, and one at the axis of symmetry. Record three width values ​​and calculate their maximum deviations.
3) Thickness measurement During the measurement, five measuring points that meet the requirements are arranged equidistantly at the width of each end of each board and measured with a board thickness meter. Record ten measurements and calculate the maximum deviation. Plain plasterboards are mainly used for indoor walls and suspended ceilings, but when used in wet environments where the kitchen, toilets and the relative humidity of the air are often greater than 70%, corresponding dampproof measures must be taken. When purchasing, please pay attention to whether the mark is complete, and whether the appearance quality and size deviation meet the requirements.
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