瓦楞纸板边压强度的测定法
<DIV style="LAYOUT-GRID-MODE: char" align=center><SPAN style="FONT-SIZE: 14pt">中华人民共和国国家标准</SPAN></DIV><DIV style="LAYOUT-GRID-MODE: char" align=center><SPAN style="FONT-SIZE: 15pt">GB/T 6546—1998</SPAN><SPAN style="FONT-SIZE: 15pt">瓦楞纸板边压强度的测定法</SPAN></DIV>
<DIV style="LAYOUT-GRID-MODE: char" align=center>Corrugated fibreboard—Determination of</DIV>
<DIV style="LAYOUT-GRID-MODE: char" align=center>edgewise crush resistance</DIV>
<DIV style="LAYOUT-GRID-MODE: char">1 范围</DIV>
<DIV style="LAYOUT-GRID-MODE: char"><SPAN> </SPAN>本标准规定了瓦楞纸板边压强度的测定方法。</DIV>
<DIV style="LAYOUT-GRID-MODE: char"><SPAN> </SPAN>本标准适用于单楞<SPAN>(三层)、双楞(五层)、三楞(七层)瓦楞纸板边压强度的测定。</SPAN></DIV>
<DIV style="LAYOUT-GRID-MODE: char">2 引用标准</DIV>
<DIV style="LAYOUT-GRID-MODE: char"><SPAN> </SPAN>下列标准所包含的条文,通过在本标准中引用而构成为本标准的条文。本标准出版时,所示版本均为有效。所有标准都会被修订,使用本标准的各方应探讨使用下列标准最新版本的可能性。</DIV>
<DIV style="LAYOUT-GRID-MODE: char"><SPAN> GB 450—89 </SPAN>纸和纸板试样的采取</DIV>
<DIV style="LAYOUT-GRID-MODE: char"><SPAN> GB 10739—89 </SPAN>纸浆、纸和纸板试样处理与试验的标准大气</DIV>
<DIV style="LAYOUT-GRID-MODE: char">3 试验原理</DIV>
<DIV style="LAYOUT-GRID-MODE: char"><SPAN> </SPAN>矩形的瓦楞纸板试样置于压缩试验仪的两压板之间,并使试样的瓦楞方向垂直于压缩试验仪的两压板,然后对试样施加压力,直至试样压溃为止。测定每一试样所能承受的最大压力。</DIV>
<DIV style="LAYOUT-GRID-MODE: char">4 试验仪器</DIV>
<DIV style="LAYOUT-GRID-MODE: char">4.1 固定压板式电子压缩试验仪</DIV>
<DIV style="LAYOUT-GRID-MODE: char"><SPAN> </SPAN>该压缩仪是采用一块固定压板和另一块直接刚性驱动压板操作的,动压板的移动速度为<SPAN>(12.5±2.5)mm/min。压板尺寸应满足试样的选定尺寸,使试样不致超出压板之外。压板还应满足如下要求:</SPAN></DIV>
<DIV style="LAYOUT-GRID-MODE: char"><SPAN> a)</SPAN>压板的平行度偏差不大于<SPAN>1:1000;</SPAN></DIV>
<DIV style="LAYOUT-GRID-MODE: char"><SPAN> b)</SPAN>横向窜动不超过<SPAN>0.05mm。</SPAN></DIV>
<DIV style="LAYOUT-GRID-MODE: char">4.2 弯曲梁式压缩仪</DIV>
<DIV style="LAYOUT-GRID-MODE: char"><SPAN> </SPAN>该压缩仪是根据梁弯曲的工作原理,对上下压板的要求与固定压板式电子压缩仪相同。测试时,压溃瞬间的刻度应在仪器可能测量的挠度量程的<SPAN>20%~80%范围内;当压板开始接触到试样时,压板压力增加的速度应为(67±13)N/s。</SPAN></DIV>
<DIV style="LAYOUT-GRID-MODE: char"><SPAN> </SPAN>使用该种-仪器</A>试验时应在报告中注明,并不得用于仲裁检验。</DIV>
<DIV style="LAYOUT-GRID-MODE: char">4.3 切样装置</DIV>
<DIV style="LAYOUT-GRID-MODE: char"> <SPAN> </SPAN>可以使用带锯或-刀子</A>,也可使用-模具</A>准备试样,但必须切出光滑、笔直且垂直于纸板表面的边缘。</DIV>
<DIV style="LAYOUT-GRID-MODE: char">4.4 导块</DIV>
<DIV style="LAYOUT-GRID-MODE: char"><SPAN> </SPAN>两块打磨平滑的长方形金属块,其截面大小为<SPAN>20mm×20mm,长度小于100mm;导块用于支持试样,并使试样垂直于压板。</SPAN></DIV>
<DIV style="LAYOUT-GRID-MODE: char">5 试样的采取和处理</DIV>
<DIV style="LAYOUT-GRID-MODE: char">5.1 试样的采取按<SPAN>GB 450的规定进行。</SPAN></DIV>
<DIV style="LAYOUT-GRID-MODE: char">5.2 试样应按<SPAN>GB 10739的规定进行温湿处理。</SPAN></DIV>
<DIV style="LAYOUT-GRID-MODE: char">6 试样的制备</DIV>
<DIV style="LAYOUT-GRID-MODE: char"><SPAN> </SPAN>切取瓦楞方向为短边的矩形试样,其尺寸为<SPAN>(25±0.5)mm×(100±0.5)mm。试样上不得有压痕、印刷痕迹和损坏。除非经双方同意,至少需切取10个试样。</SPAN></DIV>
<DIV style="LAYOUT-GRID-MODE: char">7 试验步骤</DIV>
<DIV style="LAYOUT-GRID-MODE: char"><SPAN> </SPAN>在<SPAN>5.2条规定的大气条件下进行裁样和试验。</SPAN></DIV>
<DIV style="LAYOUT-GRID-MODE: char"><SPAN> </SPAN>将试样置于下压板的正中,使试样的短边垂直于两压板,再用导块支持试样,使之端面与两压板之间垂直,两导块彼此平行且垂直于试样的表面。</DIV>
<DIV style="LAYOUT-GRID-MODE: char"><SPAN> </SPAN>开动试验仪,施加压力。当加压接近<SPAN>50N时移开导块,直至试样压溃。记录试样所能承受的最大压力,精确至1N。</SPAN></DIV>
<DIV style="LAYOUT-GRID-MODE: char"><SPAN> </SPAN>按上述步骤测试剩余的试样。</DIV>
<DIV style="LAYOUT-GRID-MODE: char">8 结果表示</DIV>
<DIV style="LAYOUT-GRID-MODE: char"><SPAN> </SPAN>垂直边缘抗压强度按式<SPAN>(1)进行计算,以N/m表示:</SPAN></DIV>
<DIV style="LAYOUT-GRID-MODE: char" align=right><SPAN> </SPAN>………………………<SPAN> (1)</SPAN></DIV>
<DIV style="LAYOUT-GRID-MODE: char">式中:<SUB><SPAN><FONT size=2> </FONT></SPAN></SUB>——垂直边缘抗压强度,N/m;</DIV>
<DIV style="LAYOUT-GRID-MODE: char"><SPAN> </SPAN>——最大压力,<SPAN>N;</SPAN></DIV>
<DIV style="LAYOUT-GRID-MODE: char"><SPAN> </SPAN>——试样长边的尺寸,<SPAN>mm。</SPAN></DIV>
<DIV style="LAYOUT-GRID-MODE: char">9 试验报告</DIV>
<DIV style="LAYOUT-GRID-MODE: char"><SPAN> </SPAN>试验报告包括如下内容:</DIV>
<DIV style="LAYOUT-GRID-MODE: char"><SPAN> a)</SPAN>本国家标准的编号;</DIV>
<DIV style="LAYOUT-GRID-MODE: char"><SPAN> b)</SPAN>样品种类、规格;</DIV>
<DIV style="LAYOUT-GRID-MODE: char"><SPAN> c)</SPAN>试验所用的标准;</DIV>
<DIV style="LAYOUT-GRID-MODE: char"><SPAN> d)</SPAN>试验场所的大气条件;</DIV>
<DIV style="LAYOUT-GRID-MODE: char"><SPAN> e)</SPAN>所用试验仪的型号和加压速度;</DIV>
<DIV style="LAYOUT-GRID-MODE: char"><SPAN> f)</SPAN>试验结果的算术平均值;</DIV>
<DIV style="LAYOUT-GRID-MODE: char"><SPAN> g)</SPAN>其他有助于说明试验结果的资料。</DIV>
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