人造板及饰面人造板电子试验机
1.简介
该人造板及饰面人造板电子试验机主要用于检测人造板和饰面人造板及其制品的三点和四点静曲强度和弹性模量,内胶合强度,内结合强度,表面胶合强度,胶层剪切强度,耐剥离力,握螺钉力及抗拉强度.
2.试验方法
GB/T17657 人造板及饰面人造板理化性能试验方法test methods of evaluating the properties of wood-based panels and surface decorated wood-based panels
3.试验介绍
3.1三点弯曲强度和弹性模量测定:
三点弯曲的静曲强度和弹性模量,是在两点支撑的试件中部施加载荷进行测定.静曲强度是确定试件在载荷作用时的弯矩和抗弯截面模量之比;弹性模量是确定试件在材料的弹性极限范围内,载荷产生的应力与应变之比. 三点弯曲强度和弹性模量测定示意图如下:
变形测量仪置于支承辊中间,测量试件变形
3.2 四点弯曲静曲强度和弹性模量测定
四点弯曲静曲强度和弹性模量是在两点支撑的试件上,距支座三分之一处分别施加相同的载茶进行测定.静曲强度是确定试件在载荷作用时的弯矩和抗弯截面模量之比;弹性模量是确定试件在材料的弹性极限范围内,载荷产生的应力与应变之比. 四点弯曲静曲强度和弹性模量试验示意图如下:
3.3内结合(胶合)强度
内胶合强度是试件表面承受均匀分布的拉力,直至破坏时的抗拉能力的测定.内胶合强度是垂直于试件表面的破坏力的试件面积之比.试样尺寸为50x50mm. 内胶合强度试验示意图如下:
注: 1------金属卡头 2------卡头(金属、硬木或硬木胶合板) 3------硬木胶合板卡头（不适用于薄板） 4------试件 5------自动调心球窝连接 t≥15mm
3.4表面胶合强度测定-----方法1
表面胶合强度是指板表面层的刨花或纤维与下层材料之间（未饰面板）或饰面材料与基材之间（饰面板）的粘结强度或粘结质量，用表面层垂直于板面破坏拉力与试件胶合面积之比表示。该方法适用于未饰面的刨花板、纤维板、水泥刨花板以及非单板饰面的人造板。表面胶合强度测定-----方法1示意图如下：
3.4表面胶合强度测定-----方法2 示意图如下
3.5 胶合强度测定
胶合强度是通过拉力载荷使试件的胶层产生剪切破坏，以确定单板类人造板的胶合质量。试件尺寸为100mm长，25mm宽。试验时，把试件两端夹紧于试验机的活动夹具中，成一直线，试件中心应通过试验机活动夹具的轴线。夹持部位与试件槽口的距离应在5mm范围内。
3.6 胶层剪切强度测定
胶层剪切强度测定是对试件逐渐施加压缩载荷使胶层产生剪切破坏，以确定胶合质量。胶层剪切强度测定示意图如下：
3.7耐剥离力测定
耐剥离力用于测定剥离表面层所需的力，适用于聚氯乙烯薄膜饰面人造板。试样长度100mm，宽度25mm.耐剥离力测定示意图如下：
3.8 握螺钉力测定
握螺钉力用于确定拔出拧入规定深度的自攻螺钉所需的力，握螺钉力测定示意图如下：
3.9抗拉强度测定
抗拉强度用于确定试件拉伸载荷与试件横截面积之比。抗拉强度试件图如下：
3.10 顺纹抗压强度测定
顺纹抗压强度可确定顺纹压缩载荷与试件横截面积之比，试件长23mm，宽15mm,厚15mm,长度方向为顺纹方向。
4.试验机技术参数
序号 | 项目 | 规格 | |||
1 | 试验力 | 20KN及以下 | 30/50KN | 100KN | |
2 | 试验力测量范围 | 1%-99%FS | |||
3 | 试验力测量准确度 | 优于示值±1% | |||
4 | 横梁位移测量精度 | 0.01mm | |||
5 | 位移测量准确度 | ±1% | |||
6 | 变形测量范围 | 0.4%-99%FS | |||
7 | 变形测量精度 | ±0.5% | |||
8 | 变形分辨率 | 0.01mm | |||
9 | 力控速率调节范围 | 0.005-5%FS/S | |||
10 | 力控速率相对误差 | ±1%设定值以内 | |||
11 | 变形速率调节范围 | 0.02-5%FS/S | |||
12 | 变形控制速率相对误差 | 速率＜0.05％FS时，为±2%设定值以内； 速率≥0.05％FS时，为±0.5%设定值以内； | |||
13 | 横梁速度测量范围 | 0.001-500mm/min | |||
14 | 横梁速度相对误差 | 速率＜0.01 mm/min时，设定值的±1.0%以内； 速率≥0.01 mm/min时，设定值的±0.2%以内； | |||
15 | 恒力、恒变形、恒位移控制范围 | 0.5％～100％FS | |||
16 | 恒力、恒变形、恒位移控制范围 | 设定值<10%FS时，设定值 的±1.0%以内 设定值≥10%FS时,设定值的±0.1%以内 | |||
17 | 变形速率控制精度 | 速率<0.05%FS时为±2.0%设定值内 速率≥0.05%FS时为±0.5%设定值内 | |||
18 | 拉伸空间 | 700mm | 700mm | 700mm | |
19 | 工作环境 | 室温—35℃,相对湿度不超过80% | |||
20 | 整机电源 | 单相,220V±10%,50Hz | |||
21 | 电机功率 | 0.75KW | 0.75KW | 1.5KW | |
22 | 主机尺寸 | 750x480x1700mm | 720x520x1800mm | 900x600x2100mm | |
23 | 重量 | 280kg | 350kg | 450kg | |
Wood-based panels electronic universal testing machine
1.introductions
This wood-based panels electronic universal testing machine is to measure and determine mechanical properties of wood-based panel and surface decorated wood-based panels for parameter of 3 point and 4 point flexural test strength and elastic modulus, internal bonding strength, surface bonding strength, shear strength of bonding layer, peel force, screw holding force and tensile strength.
2. test method
GB/T17657 test methods of evaluating the properties of wood-based panels and surface decorated wood-based panels
3. test introductions
3.1 three point flexural strength and elastic modulus test
The three point flexural strength and elastic modulus test is to load at the center of test piece supported by two points. Static flexural test is to determine the ratio of bending moment and bending section modulus of test piece under the maximum load. The modulus of elasticity is to determine the ratio of the stress to the strain generated by the load within the elastic limit of the material. Drawing of three point flexural strength and elastic modulus test is as following:
Deformation measuring meter is under the center point of support rollers to measure deformation of test specimen
3.2 Four-point static bending strength and elastic modulus measurement
The four-point static bending strength and elastic modulus are measured on the specimen supported by two points, and the same load is applied at one-third of the distance from the support. The static bending strength is to measure the ratio of bending moment and bending section modulus under maximum load. Elasticity modulus is to determine the ratio of the stress to strain generated by the load within the elastic limit of the material. The schematic diagram of the four-point bending static bending strength and elastic modulus test is as follows:
3.3 internal bonding strength test
The internal bonding strength is the measurement of the tensile strength of the specimen surface with a uniformly distributed tension until failure. The internal bonding strength is the ratio of the specimen area perpendicular to the surface of the test specimen with the maximum destructive force. The specimen size is 50x50mm. The schematic diagram of internal bonding strength test is as follows:
Note: 1------metal chuck 2------chuck(metal , hardwood or hardwood plywood)
3------hardwood plywood chuck(not suitable for thin plate) 4------test piece
5------auto adjusting joint t≥15mm
3.4 Surface bonding strength determination-method 1
Surface bonding strength refers to the bonding strength or bonding quality between the shavings or fibers of the surface layer of the board and the underlying material (not veneer) or between the veneer material and the substrate (veneer). It is expressed as the ratio of maximum breaking tension force perpendicular to the surface board and bonding area. This method is suitable for non-veneered particleboard, fiberboard, cement particleboard and non-veneered wood-based panels. Surface bonding strength determination-Method 1 schematic diagram is as follows:
3.4 Surface bonding strength determination-Method 2. The schematic diagram is as follows
3.5 Bonding strength determination
Gluing strength is the shear failure of the glue layer of the test piece through tensile load to determine the glue quality of the veneer wood-based panel. The size of the test piece is 100mm long and 25mm wide. During the test, clamp both ends of the test piece in the movable fixture of the testing machine to form a straight line. The center of the test piece should pass through the axis of the movable fixture of the testing machine. The distance between the clamping part and the notch of the test piece shall be within 5mm.
3.6 Determination of adhesive layer shear strength
The shear strength of the adhesive layer is measured by gradually applying a compressive load to the specimen to cause shear failure of the adhesive layer to determine the bonding quality. The schematic diagram of the shear strength of the adhesive layer is as follows:
3.7 Determination of peel resistance
Peeling resistance is used to determine the force required to peel off the surface layer, and is suitable for polyvinyl chloride film facing wood-based panels. The length of the sample is 100mm, and the width is 25mm. The schematic diagram of the peel resistance measurement is as follows:
3.8 Screw holding force measurement
The screw holding force is used to determine the force required to pull out a self-tapping screw with a specified depth. The screw holding force measurement diagram is as follows:
3.9 Tensile strength determination
The tensile strength is used to determine the ratio of the maximum tensile load of the specimen to the cross-sectional area of the specimen. The tensile strength test piece diagram is as follows:
3.10 Determination of compressive strength along the grain
The compressive strength along the grain can determine the ratio of the maximum compressive load along the grain to the cross-sectional area of the specimen. The specimen is 23mm long, 15mm wide, 15mm thick, and the length direction is along the grain direction.
4. technical parameters
No | Item | Specification | |||
1 | Force capacity | 20KN and lower | 30/50KN | 100KN | |
2 | Measuring range | 1%-99%FS | |||
3 | Accuracy of force value | Less than ±1% of set value | |||
4 | Precision of displacement | 0.01mm | |||
5 | Accuracy of displacement value | ±1% | |||
6 | Deformation measuring range | 0.4%-99%FS | |||
7 | Accuracy of deformation measuring | ±0.5% | |||
8 | Resolution of deformation | 0.01mm | |||
9 | Force speed range | 0.005-5%FS/S | |||
10 | Accuracy of force speed | Less than ±1% of set value | |||
11 | Deformation speed range | 0.02-5%FS/S | |||
12 | Accuracy of deformation speed control | When set value is less than 0.05%FS，error is less than ±2.0% of set value When set value is more than 0.05%FS，error is less than ±0.5% of set value | |||
13 | Displacement speed range | 0.001-500mm/min | |||
14 | Accuracy of displacement speed | When speed is less than 0.01mm/min，error is less than ±1.0% of set value When set value is more than 0.01mm/min，error is less than ±0.2% of set value | |||
15 | Range of constant force, constant deformation, constant displacement control | 0.5％～100％FS | |||
16 | Accuracy of constant force, constant deformation, constant displacement control | When set value is less than 10%FS，error is less than ±1.0% of set value When set value is more than 10%FS，error is less than ±0.1% of set value | |||
17 | Accuracy of deformation speed | When set value is less than 0.05%FS，error is less than ±2.0% of set value When set value is more than 0.05%FS，error is less than ±0.5% of set value | |||
18 | Tension space | 700mm | 700mm | 700mm | |
20 | Voltage | Single phase,220V±10%,50Hz(110V) | |||
21 | Motor power | 0.75KW | 0.75KW | 1.5KW | |
22 | Dimension | 750x480x1700mm | 720x520x1800mm | 900x600x2100mm | |
23 | Weight | 280kg | 350kg | 450kg | |
