PN-4PF500F 4-Point Bending Stiffness Tester

USER MANUAL

HANGZHOU PNSHAR TECHNOLOGY CO.， LTD.

The cover image is for reference only, please read this manual carefully before use and keep it for future reference.

Preface

Thank you for choosing PNSHAR products.To ensure safety and best performance,please read the following instructions carefully. Incorrect installation and use may cause product damage or safety hazards.

PNSHAR follows the principle of continuous development, and sorry for cannot notify you of the subsequent product upgrades or user manual changes, and the upgraded products will be operated in accordance with the new user manual.

Any modification to the product is strictly prohibited!PNSHAR will not assume any responsibility for any problems or accidents caused by unauthorized modification.

PNSHAR promises that each product is produced in strict accordance with the company's process and quality management system. During the product warranty period, if any non-human problems affect normal use,PNSHAR wil repair the defective products free after confirmation.For products beyond the warranty period,our company provides chargeable maintenance services for life.

PNSHAR's registered trademark is

HANGZHOUPNSHARTECHNOLOGYCO.,LTD

2026-08 V2

Please read the following safety precautions carefully before use Safety precautions introduce important content related to safety, please be sure to follow them. Safety matters are divided into "danger" and "caution".The meaning is as follows:

Table of Contents

Preface.. 2
Tableof Contents 4
Chapter 1 Precautions for tester Installation . 5
Chapter 2 Brief Operating Procedures.. 6
Chapter 3 Introduction.. 7
Chapter 4 Tester Structure Diagram.. 9
Chapter 5 Standard Basis. 9
Chapter 6 Main Technical Parameters.. .10
Chapter 7 Operating System Diagram.. 11
7.1 Operation keys.. 11
7.2[Test] interface.. 13
7.3 [Data center] interface.. .13
7.4 [Setting] interface.. .14
7.5 [Support] Interface... 21
Chapter 8 Test... .23
8.1 Power on ... 23
8.2 Sample information setting. 24
8.3 Sampling and treatment. 24
8.4 Test .. ..24
8.5 Testing result processing. .29
Chapter 9 Tester Calibration and Maintenance . .31
9.1 Force calibration.. .31
9.2 Distance Calibration.. .32
9.3Maintenance of the tester . .32
Chapter 10 Intelligent Information Network Connection . .33
10.1 Wireless network connection . .33
10.2 Other forms of connection .. .33
Chapter 11 Troubleshooting. .34

Chapter 1 Precautions for tester Installation

Before testing each day, please turn on the power to warm up for 1 0 ~ 3 0 minutes.
The protective ground wire of the power supply must be reliably connected to the ground,otherwise, the tester cover may be lactiferous and the tester iselectrostatically interfered with.
Once the product is out of control, turn off the power immediately.

The time interval between turning the power switch off and on again must exceed 20 seconds.

Chapter 2 Brief Operating Procedures

1. Power on

Turn on the power and warm up for 1 0 { ~ } 3 0 minutes.

2. Parameter setting

Set V(test),Force,Deformation,distance L1 and Bend Length L2

3. SamplePreparation

Cut one sample at a time. The edges of the sample should be straight and parallel，with clean and undamaged cuts. The sample should be marked to indicate the testing direction and the testing surface. During sample preparation and subsequent handling,extreme care must be taken to avoid damaging the sample.When dimension L is in the longitudinal direction， the measurement reflects longitudinal stiffness.At least 1O samples should be cut for each direction.

4. Place sample

Select the most suitable test length and adjust the instrument accordingly. The support points are typically arranged such that 2 L _ { 1 } is approximately equal to L _ { 2 } ：

Place the sample on the lower pair of support points,and carefully adjust the upper (inner) pair of support points so that they just make contact with the sample.At this point, there should be no applied load.

5. Testing

Click on the touch screen or the metal button [Test] to start the test. The test result is displayed on the screen.

6. Data query, statistics,and printing

Each screen displays 10 sets of test data.Data printing is divided into single printing and statistical printing.Select one of the data for single printing. unselect it or press the key M and then press the key 骨 for statistical printing.

7. Power off

Turn off the power switch.

Chapter 3 Introduction

PN-4PF500F 4-Point Bending Stiffness Tester is a corrugated board bending stiffness testing instrument designed and developed based on relevant standards using the multi-point loading method. It is suitable for two-point, three-point, and four-point bending strength tests of various corrugated boards and rigid paperboards,as well as bending strength tests of other materials such as graphite.

This instrument adopts the four-point bending method.

Bending stiffness refers to the unit resistance moment generated when paper or paperboard is subjected to bending force within the elastic deformation range.Higher bending stiffness provides the board with certain rigidity and strength,enhancing the box's resistance to bulging and improving the protective capability of its contents.

During testing，the sample is placed on two adjustable supports.Upon pressing the start button, the upper pressure bar descends to apply a load to the sample.The deformation is measured under a preset force，or the force is measured under a preset deformation, to calculate the bending stiffness value.

Key Technical Features:

1.Adopt new module circuit design,with WIFl loT function. After networking, the test results can be saved to the cloud server，and through the dedicated PN-QMS series quality management system，data query, management， reporting， bigdata analysisstatistics， andvisual large-screen display can be used.
2. After the test, return at high speed to improve the test efficiency.
3. Adopt ball screw transmission structure, high transmission efficiency.
4. Using imported stepper motor control，using subdivision technology，so that the instrument positioning is accurate, the speed response is fast, the test time is saved,and the test efficiency is improved.
5. Usinghigh-speed ARMprocessor， optimize test program， preset parameters one-click test, improve test efficiency.
6. With curve and column chart display function, convenient for the review of test results.
7. Units can be switched: N，kgf， Ibf. Multi-language operating system switching.
8. Optional: can be connected to special computer test software，real-time display of force test curve， massive test data storage and query, management,analysis,statistics,reports,and other functions.

Chapter 4 Tester Structure Diagram

Chapter 5 Standard Basis

This product meets the following standards:

GB/T23144 ISO 5628

Chapter6 Main Technical Parameters

Chapter 7 Operating System Diagram

7.1 Operation keys

7.2 [Test] interface

Power on,the main interface of [Test] is displayed after the self-check is completed.

7.3 [Data center] interface

(1)[Data]-[ Curve] Curve Interface

In the test [curve] interface of [Data]，single test data and curves are displayed.

(2) [Data] Bar graph Interface

山 Inthe [Test] interface，click the key to enter the [Data] bar graph interface,displaying multiple test data and bar graph.

7.4 [Setting]interface

(1) [Parameter setting] interface

In the[Test] interface,click the button to enter the [Parameter Seting] interface,whichmainly has the following parameters.

1) 【Distance】

Click the [Distance] key to enter the platen distance setting interface.

The distance between the upper and lower side is set according to the test requirements. You can directly enter the value of the platen spacing,or you can use the keys to adjust.

2) 【Test Speed】

Adjustable between(1-500) mm/min

3) 【Force】

Force in the normal direction of the unbent specimen at each support point (formost instruments, the measured force is 2F).

4) 【Deformation】

The deflection of the specimen is measured at the midpoint between the inner support points,determined along the line connecting the contact points of the two inner supports with the specimen,expressed in mm.

5) 【Width】

The width of the sample is 1 0 0 ~ \mathsf {mm } or 5 0 ~ \mathsf {mm } =

6) 【Distance L1】

The distance L1，is the measured distance between one of the outer supporting anvils and the point of application of the neighbouring force,F.

7) 【Bend Length L2】

The bending length L2, is the distance between the points of application of the two inner forces and the two inner anvils.

8) 【Save】

Themodified parameters will take effect immediately. If you do not save the parameters, the parameters willbe restored to the last saved values when you turn on the machine next time.The parameter save password is "1253".

(2)[System] interface

In the[Test] interface,click the key 安 to enter the [System] interface, which has the following parameters or functions: system parameters，unit switching， language selection，network settings，tester calibration，backup recovery, optional,and time settings.

1)[System parameters]

Do not modify any parameter in this interface at will, otherwise, the testermay malfunction!

[More]

Inthe [Parameters] interface,press thekey to enable other function switches.Do not modify at will, otherwise, the tester may have a problem!

2) [Units]

There are three types of units for your choice:N、kgf、Ibf.

全 1 ~ { \mathsf { N } } = 0 . 1 0 1 9 7 1 ~ { \mathsf {kg } } { \mathsf { f } } = 0 . 2 2 5 Ibf☆ 1 ~ \mathsf {kg f } = 9 . 8 0 6 6 5 ~ \mathsf { N } = 2 . 2 0 5 Ibf\diamondsuit 1 Ibf = 0 . 0 4 5 3 6 {kg } { f } = 4 . 4 4 8 { N }

indicatestheselectedunit

3） [Language]

The system has two languages for your choice.The tester needs to be restarted after the language switch.

indicates the selected language.

4) 【WiFi】

Wireless WiFi network connection setting interface (only 2.4G WiFi network issupported).

SSID: the user name of the wireless network.

Password:The password of the wireless network.

Join:After entering the network name and key,click [Connect to the network]to connectto thenetwork.

Enable WiFi: black means not to enable, orange means to enable network.

Updates: update the system software under the network status (please do it under the guidance of our professional staff!).

◇Cloud Storage: black means not enabled,while the orange icon means that the data cloud storage function is on,and the test data will be saved automaticallyto thecloud server.

5) [Calibration]

The tester should be calibrated regularly as needed. The recommended calibration period isone year. See chapter 9 fordetails.

6) [Backup]

Backup: back up current parameters to the system backup area.Click the [Backup] button，enter the password "1263"，and prompt "Operation Complete"to complete the backup parameters.

Recovery: Overwrite the current parameters with the backup parameters. Click the [Recovery] button，enter the password "1263"，and prompt

"Please restart the tester" to complete the restoration of parameters

◇Default: tester production debugging parameters，users should not operate!

7） Optional

In the [System] interface，click the key to enter the [Optional] interface.

Initial Load

The initial load is the baseline load used to start calculating the deformation.

8) [Time]

Modify system time and date, input format:year ^ + month ^ + day ^ + hour ^ + minute ^ + second.

7.5 [Support] Interface

In the [Test Center],press the □_日 button to enter the [Support] interface to obtain related manuals,operation videos, or related information.

Chapter 8 Test

8.1 Power on

Turn on the power of the tester and the system self-checks as shown in the figure below:

After the self-check is completed,enter the[Test] interface,as shown in the figure below:

i

If the force value display is not O before any sample is placed, please click the force value displayarea to reset.

8.2 Sample information setting

□ In the[Test] interface,click the button on the left side of the [Sample] to display company information， tester，remarks，and return，and click the corresponding option to operate.

□ Sample: the number of the tested sample (within 16 English characters or numbers).

> Company: company name (less than 16 English characters or numbers) 全 Tester: Operator's name (less than 8 English characters or numbers). ☆ Remarks: Other remarks (less than 8 English characters or numbers). > Return: Exit

8.3 Sampling and treatment

The sample is taken according to ISO 186,and the treatment is according to ISO 187.

8.4 Test

Parameter Settings

Set the test speed, loading force, deformation, sample width,distance L1, and bend length L2. (It is recommended to set them slightly larger than the sample dimensions.) Fordetails,refer to Chapter7.

SamplePreparation

Cut one sample at a time,ensuring the edges are straight, parallel,and neatly trimmed without damage.Mark the sample to indicate the test direction and test surface.Handle the sample with extreme care during preparation and handling to avoid any damage.When dimension L is in the longitudinal direction, the measurement reflects longitudinal stiffness.At least 10 samples should be cut for each direction.

SamplePlacement

Select the most suitable test length and adjust the instrument .The support points should typically be arranged so that 2 \mathsf { L } 1 \approx \mathsf { L } 2 . \mathsf { P } | lace the sample on the lower pair of support points, then adjust the upper pair to lightly contact the sample without applying any load.

Test

Press on the touch screen or the metal button [Test] key to start Until the stacking condition is reached. The test process displays the force value, deformation，and curve in real-time. The test is over and reset,and the test result is displayed on the screen.As shown below:

Follow the above to test multiple samples.The tester can save up to 10 test results,and if thereare more than10,the latest10 test resultswillbe saved.

Calculation of bending stiffness

The bending stiffness S of sample is calculated according to Formula（1)

Where,

\mathsf { S } _ { \mathsf { b } } . The bending stiffness,mN.m ;
F—Force,N;
d- -lineardeflection,mm;
b- -Width of sample,mm;
L1 -distance in the four-point method,mm;
L2 -bending length in the four-point method,mm.

Four-point method

According to the formula,L1,L2,and b remain constant, with F (load force) and d (deflection) being the only variables.The test can be conducted either by:

(1) Setting a specific deflection to measure the corresponding force,or (2)Applying a predetermined force to measure the resulting deflection

Single print report style:

Statistical print report style:

Test Report

INSTRUMENT:PN-4PF500F Sample: PNSHAR123456789 Total: 03

01: \mathsf { S } = 5 . 0 0 \mathsf { m N } ^ { \star } \mathsf { m }
02: S= 5.31 mN\*m
03: \mathsf { S } = 5 . 5 6 \mathsf { m N } ^ { \star } \mathsf { m }

S(ave) = 0.90 mN\*m F(ave) = 8.00 N D(ave) = 0.47 mm

S(min) = 5.00 mN\*m S(max) = 5.56 mN\*m SD =0.2 mN\*m CV = 5.3 %

D:2022-08-18 T:16:32:54

Remark:

Test report description:

01,02,03:is the test serial number.
Average bending stiffness-S:the average value of bending stiffness of multiple samples in the same batch.
Average deformation: the average deformation of multiple samples in the same batch. Standard Deviation-SD describes the average of the distance (deviation from the mean) that each data deviates from the mean.It is the square root of the square sum of the deviation from the mean.
Coefficient of Variation-CV: The ratio of standard deviation to average.

8.5 Testing result processing

(1) Single test result curve display

In the test [curve] interface of [Data Center], you can query all test results by presing the keyand can also perform operations suchas printing and deleting.

(2) Bar graph display

In the[Test Curve] interface, press the key to display the test result in a bar graph.

Click [Force value N] to pop up the force etc. option.select according to your

needs.

(3) Data deletion

Select one or more data and press the key todeletethe selected data.

without selecting any data, press the key

to clearall the saved test data.

(4) Data statistics

In the [Data Center] interface,press the key £ to display the statistical report of all test results this time,including the average,maximum,minimum, standard deviation,and coefficient of variation.

(5) Result printing

Single print:

Select one or more data,click the key to print the selected data.

Statistics printing:

Click the [Statistics] key first, then click the key to print the statistics report.

Chapter 9 Tester Calibration and Maintenance

Calibration includes force value calibration and screen calibration. For force value calibration， please operate by professionals with metrological qualifications.The general calibration cycle is one year.

9.1Force calibration

In the [Test] interface,click the 安 $$ 回 $$ T key to get into the calibrationinterface.

Before calibration, apply the maximum test force at least three times as the preload (add force to full scale, repeat 3 times).

The calibration adopts a standard dynamometer, place the sensor of the standard dynamometer in the middle position of the pressure plate of the tester then adjusts the distance between the pressure plates to a suitable position and set the return speed to 1 { {mm / m i n } } .Performcalibrationat calibration point 4（ 8 0 % of full scale). Observe the force value displayed on the tester.If the deviation from the standard dynamometer exceeds 1 % , calibrate it.

Click [Calibrate] to pop up a digital dialog box, enter the force value of the standard dynamometer,and then click ,enter "1253",and the calibration is completed.and other calibration points can be calibrated as needed.

9.2 Distance Calibration

If there is a deviation between the platens displayed by the tester and the actual distance value,distance calibration is required.

In the test center，click 安 $$ 回 $$ [Distance]to enter the spacing calibrationinterface.

Measure the actual distance between the the upper and lower side，click the [distance calibration] button，the numeric keyboard will pop up,and then enter the actual distance between the upper and lower pressure plates.

The actual distance between the upper and lower platens is accurateat 0 . 1 \mathsf {mm }

9.3 Maintenance of the tester

\bullet To prolong the service life of the instrument and reduce the abrasion of mechanical parts，grease the polished rod and Ball screw rod regularly (usuallyabout half a year).

\bullet Keep instrument clean.

\bullet Long time when not in use,be sure to take down the power plug from the power socket.

Chapter 10 Intelligent Information Network Connection

The tester has a variety of connection forms,which can be connected to a computer via USB，serial port，WiFl network，and transmit test data to a designated local or cloud server.

10.1 Wireless network connection

Referto the description in Chapter 7 for the wireless connection method. After networking, turn on the [Data Storage] function,and the test results can be transmitted to the server in real-time via the WiFl network for use by the managementsystem.

10.2 Other forms of connection

In[Test Center], press 回四 to enter the [More Setings] interface.

Indicates thatit isselected,prss and enter the password "1263" to save the settings.

05Connect MTS:Connect PNSHAR professional test software.

06 Connect to ERP:Connect PNSHAR PN-QMS series quality managementsystemsoftware.

11 Connect to Lims:Connect to the customer's LIMS or ERP management system (connection agreement can be customized).

Chapter 11 Troubleshooting

Fault 1: Distance is not accurate.

Reason:

When the upper platen is moving, it stops abruptly affected by artificial influence.

Solution:

Distancecalibration.

Fault 2: The force value is always zero

Reason:

1) The force value coefficient is lost. 2) The sensor is damaged.

Solution:

1) Restore the parameters or contact our company to manually correct the force value coefficient.2) Replace the sensor.