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Thickness of corrugated board

紙板的厚度也是紙箱外觀重缺陷檢驗(yàn)項(xiàng)日之一。紙板的厚度指標(biāo)如何，直接影響到紙板的邊壓強(qiáng)度、戳穿強(qiáng)度和抗壓強(qiáng)度等性能，而影響紙板厚度指標(biāo)的原因有多種情況，如瓦楞輥齒尖(頂)部位磨損變低、導(dǎo)紙片沒有調(diào)整好、單面機(jī)的速度過快、外界壓力過高以及瓦楞輥溫度偏低等。若瓦楞紙板厚度偏薄的話，它的邊壓強(qiáng)度、戳穿強(qiáng)度和抗壓強(qiáng)度等性能，也將相應(yīng)下降。瓦楞紙板的楞型不同，厚度也有所差異。

The thickness of cardboard is also one of the inspection items of carton appearance defects. The thickness index of paperboard directly affects the edge pressing strength, puncture strength and compressive strength of paperboard. There are many reasons affecting the thickness index of paperboard, such as low wear at the tooth tip (top) of corrugating roller, poor adjustment of paper guide, too fast speed of single-sided machine, too high external pressure and low temperature of corrugating roller. If the thickness of corrugated board is too thin, its edge compressive strength, puncture strength and compressive strength will also decrease accordingly. Corrugated board has different corrugated type and thickness.

瓦楞紙板厚度是指在一定壓力下瓦楞紙板上下面間的垂直距離，實(shí)驗(yàn)室通常采用瓦楞紙板厚度計(jì)檢測(cè)紙板的厚度，測(cè)量時(shí)，選擇紙板上無損壞、無壓痕、無塌瓦的若干部位(距邊緣不小于50mm)作為檢測(cè)點(diǎn)，分別置于測(cè)量頭與量砧之間進(jìn)行測(cè)量，并分別讀取百分表的測(cè)量數(shù)值。取樣數(shù)量一般為10個(gè)，較后，求其平均值，即為檢驗(yàn)結(jié)果。紙板的厚度大，紙箱的垂直抗壓和平面抗壓性能相應(yīng)也就高。所以，瓦楞紙板的厚度指標(biāo)，是生產(chǎn)過程中不可忽視的檢測(cè)項(xiàng)目。

Corrugated board thickness refers to the vertical distance between the top and bottom of corrugated board under certain pressure. Corrugated board thickness gauge is usually used in the laboratory to detect the thickness of corrugated board. During measurement, several parts on the board without damage, indentation and tile collapse (not less than 50mm from the edge) are selected as detection points and placed between the measuring head and anvil for measurement, And read the measured value of the dial indicator respectively. The number of samples is generally 10, and the average value is the inspection result. The thickness of paperboard is large, and the vertical and plane compressive properties of carton are correspondingly high. Therefore, the thickness index of corrugated board is a test item that can not be ignored in the production process.

三、邊壓強(qiáng)度

3、 Edge pressure strength

一定寬度的試樣，單位長度所能承受的壓力叫邊壓強(qiáng)度，它是指承受平行于瓦楞方向壓力的能力。按照有關(guān)的標(biāo)準(zhǔn)，邊壓強(qiáng)度的試樣從3個(gè)桿箱中，每個(gè)分別切取3塊無機(jī)械壓痕、無印刷痕跡和損壞的試樣，試樣的瓦楞方向應(yīng)為短邊，試樣規(guī)格為25mm x100mm，誤差±0．5mm。這就要求取樣器的刀口應(yīng)保持的鋒利，并且刀架上的刀片，安裝位置要合適，刀刃口與刀槽所成角度可調(diào)整45°為適。

The pressure that a specimen with a certain width can bear per unit length is called edge compression strength, which refers to the ability to bear the pressure parallel to the corrugation direction. According to relevant standards, three samples without mechanical indentation, printing trace and damage shall be cut from each of the three rod boxes for the sample of edge compression strength. The corrugated direction of the sample shall be the short side, and the sample specification shall be 25mm x100mm, with an error of ± 0.5mm. This requires that the knife edge of the sampler should be kept sharp, and the blade on the tool holder should be installed in an appropriate position, and the angle between the blade edge and the tool slot can be adjusted to 45 °.

此外，刀尖不可碰擦到刀槽底部，防止刀口彎曲變形，使切取出來的試樣邊緣瓦楞容易出現(xiàn)損壞和起毛現(xiàn)象，影響檢測(cè)的準(zhǔn)確性。邊壓強(qiáng)度的換算公式為：R= F／L x 103。式中：R為瓦楞紙板試樣邊緣的抗壓強(qiáng)度，用N／m表示：F是試樣壓潰時(shí)讀取的力值；L是試樣長邊的尺寸，單位是mm。原紙的環(huán)壓強(qiáng)度和紙板的粘合強(qiáng)度如何，很大程度上決定著紙板的邊壓強(qiáng)度。

In addition, the knife tip shall not touch the bottom of the knife groove to prevent the bending and deformation of the knife edge, so that the corrugated edge of the cut sample is prone to damage and fuzzing, which affects the accuracy of detection. The conversion formula of boundary pressure strength is: r = f / L x 103. Where: R is the compressive strength of the edge of the corrugated board sample, expressed in N / M; F is the force value read when the sample is crushed; L is the dimension of the long side of the specimen, in mm. The edge pressing strength of paperboard is largely determined by the ring pressing strength of base paper and the bonding strength of paperboard.

四、粘合強(qiáng)度

4、 Adhesive strength

瓦楞紙板的面紙、里紙、芯紙和波型瓦楞紙的楞峰粘合程度，在一定單位長度內(nèi)經(jīng)施加測(cè)試所能承受的較大剝離力，叫做瓦楞紙板的粘合強(qiáng)度。粘合強(qiáng)度的檢測(cè)，主要是檢驗(yàn)瓦楞紙板裱貼的牢度，A型瓦楞紙板的檢測(cè)，剝離架的插針應(yīng)采用中3mm，而B、C型瓦楞紙板的瓦楞孑L較細(xì)，剝離架的插針則應(yīng)采用①2mm比較合適。剝離架上的每根插針應(yīng)正好對(duì)準(zhǔn)瓦楞槽口的部位，且間距調(diào)相等后，將各只螺絲擰緊固定。粘合強(qiáng)度的檢測(cè)樣塊，要求取12塊，即從3個(gè)樣箱中分別各取4塊，其瓦楞方向?yàn)槎踢叺?即25mm)，材質(zhì)完好無損，無脫膠、無起泡的樣塊。

The peak adhesion degree of face paper, inner paper, core paper and corrugated paper of corrugated board is called the adhesion strength of corrugated board. The test of adhesive strength is mainly to test the mounting fastness of corrugated board. For the test of type a corrugated board, the pin of stripping frame should be medium 3mm, while the corrugated residue l of type B and C corrugated board is thin, and the pin of stripping frame should be ① 2mm. Each pin on the stripping frame shall be aligned with the corrugated notch, and after the spacing is adjusted to be equal, tighten and fix each screw. For the test sample blocks of adhesive strength, it is required to take 12 pieces, that is, 4 pieces from each of the three sample boxes. The corrugated direction is short side (i.e. 25mm), and the material is intact without degumming and blistering.

樣塊規(guī)格為25mm x 80mm，誤差±1．0mm，這樣可較好地保證檢測(cè)的準(zhǔn)確性。粘合強(qiáng)度的換算公式為：P F／L。式中：P為瓦楞紙板試樣的粘合強(qiáng)度，用N／m表示；F是試樣分離時(shí)讀取的力值，單位是N；L是試樣長邊的尺寸，單位是m。粘合劑的質(zhì)量、配方以及設(shè)備、操作工藝等因素的合適與否，決定著紙板的粘合強(qiáng)度，而紙板的粘合強(qiáng)度好壞，在很大程度上影響著紙箱的抗壓力強(qiáng)度、耐破強(qiáng)度和戳穿強(qiáng)度等性能。

The sample block specification is 25mm x 80mm with an error of ± 1.0mm, which can better ensure the accuracy of detection. The conversion formula of adhesive strength is: PF / L. Where: P is the bonding strength of corrugated board sample, expressed in N / M; F is the force value read during sample separation, in N; L is the dimension of the long side of the sample, in M. The quality, formula, equipment, operation process and other factors of the adhesive determine the adhesive strength of the paperboard, and the adhesive strength of the paperboard greatly affects the performance of the carton, such as pressure strength, burst strength and puncture strength.

五、戳穿強(qiáng)度

5、 Puncture strength

以一定形狀的角錐穿過瓦楞紙板所做的功，所顯示的稱為瓦楞紙板的戳穿強(qiáng)度，它的單位是：J。戳穿強(qiáng)度指標(biāo)是采用戳穿強(qiáng)度測(cè)定儀進(jìn)行檢驗(yàn)的，檢測(cè)時(shí)，挑選3個(gè)外觀較好的樣箱，從每個(gè)樣箱的箱壁上各取4塊無破壞、無水印、無折痕和無其他外觀缺陷的紙板，規(guī)格為175mm x 175mm的檢測(cè)樣12塊。分切試樣時(shí)應(yīng)注意起始線與瓦楞成平行狀態(tài)。在每次檢測(cè)之前應(yīng)對(duì)儀器調(diào)零校準(zhǔn)，其方法是：

The work done by a certain shaped pyramid passing through the corrugated board is called the puncture strength of the corrugated board, and its unit is J. The puncture strength index is tested by the puncture strength tester. During the test, select 3 sample boxes with good appearance, take 4 pieces of paperboard without damage, watermark, crease and other appearance defects from the box wall of each sample box, and 12 test samples with the specification of 175mm x 175mm. When cutting the sample, it shall be noted that the starting line is parallel to the corrugated. Before each test, the instrument shall be zeroed and calibrated by:

1.將重錘和試樣夾板去除后，將指針撥較大值處把擺置于開始試驗(yàn)的位置，按下擺的釋放裝置后，擺動(dòng)的擺應(yīng)使指針指向“0”位，否則，需擰動(dòng)調(diào)節(jié)螺絲進(jìn)行調(diào)整；

1. After removing the heavy hammer and sample splint, turn the pointer to the larger value and place the pendulum at the starting position of the test. After pressing the release device of the lower pendulum, the swinging pendulum shall make the pointer point to "0", otherwise, it is necessary to screw the adjusting screw for adjustment;

2.要根據(jù)試樣的大體強(qiáng)度，選擇適當(dāng)?shù)闹劐N，使測(cè)量值在測(cè)量范圍的20％～80％之間；

2. According to the general strength of the sample, select an appropriate heavy hammer to make the measured value between 20% ~ 80% of the measurement range;

3.將試樣牢固地夾在測(cè)試板中間，將指針撥較高刻度值，把磨擦環(huán)套在角錐后面，把擺鎖試驗(yàn)時(shí)的起始位置，

3. Clamp the sample firmly in the middle of the test plate, turn the pointer to a higher scale value, put the friction ring behind the corner cone, and lock the pendulum to the starting position during the test,

4.按下釋放裝置，使擺臂推動(dòng)角錐穿透試樣，然后讀取檢測(cè)數(shù)值；

4. Press the release device to make the swing arm push the corner cone to penetrate the sample, and then read the test value;

5.將正面、后面、縱向、橫向等檢測(cè)的數(shù)值，求出算術(shù)平均值，保留3位數(shù)字。

5. Calculate the arithmetic mean of the detected values of front, rear, vertical and horizontal, and keep 3 digits.