CN106896055B

CN106896055B - Pressurization method for measuring wrinkle recovery angle of fabric

Info

Publication number: CN106896055B
Application number: CN201710248555.1A
Authority: CN
Inventors: 王蕾; 潘如如; 高卫东
Original assignee: Jiangnan University
Current assignee: Jiangnan University
Priority date: 2017-04-17
Filing date: 2017-04-17
Publication date: 2020-03-24
Anticipated expiration: 2037-04-17
Also published as: CN106896055A

Abstract

The invention discloses a pressurizing method for measuring the crease recovery angle of a fabric, which comprises the following steps: placing a rectangular sample on a test bench, wherein the long edge of the sample is parallel to a horizontal plane, the wide edge of the sample is vertical to the horizontal plane, one wing is clamped and fixed, and the other wing is not clamped; pressurizing the sample by adopting a pressurizing device which moves horizontally, wherein the pressure direction is the horizontal direction and is vertical to the plane of the sample fixing wing; the pressurizing device comprises a pressing block and a prepressing plate, and the prepressing plate fixes the position of the sample without clamping wings before the sample is pressurized; the motion power of the briquette is derived from the energy of compressed air; the pressurizing pressure and the movement speed of the pressing block are adjustable; when the pressurizing device releases the pressure, the pressing block and the prepressing plate are connected into a whole through electromagnetic action and are separated from the surface of the sample together. The pressurization mode can realize the acquisition of the recovery angle of the sample at the initial recovery stage, and further evaluate the whole recovery process of the sample.

Description

Pressurization method for measuring wrinkle recovery angle of fabric

Technical Field

The invention relates to the field of fabric quality detection methods, in particular to a pressurizing mode of a fabric wrinkle recovery angle detection method.

Background

The crease recovery performance of the fabric is one of important indexes for evaluating the quality of the fabric and is related to the usability and the shape retention of the fabric. The existing method for evaluating the crease recovery performance of the fabric mainly comprises a recovery angle method and an appearance method, wherein the recovery angle method can measure angle data which is more visual than the crease grade evaluation of the appearance method, so that the method is more widely used.

The current standard method for measuring the crease recovery angle of the fabric adopts a heavy hammer to pressurize a sample, and measures the recovery angle value of the sample in a set time after the pressure is released to measure the performance. However, due to the limitation of the pressurizing mode, the original position of the sample needs to be changed for testing after the sample is pressurized, so that the influence of gravity on the measurement result is avoided, and the recovery condition of the sample at the initial moment of the recovery stage cannot be obtained.

Therefore, the method adopts horizontal pressurization to make the sample generate crease, and realizes accurate measurement of the change condition of the crease recovery angle of the fabric in the whole recovery process.

Disclosure of Invention

In view of the above, the present invention aims to provide a scientific and reliable method for accurately measuring the wrinkle recovery performance of a fabric in the whole process.

Based on the above purpose, the invention provides a pressing method for measuring fabric wrinkle recovery angle, which comprises the following steps:

1. placing a rectangular sample on a test bench, wherein the long edge of the sample is parallel to a horizontal plane, the wide edge of the sample is vertical to the horizontal plane, one wing is clamped and fixed, and the other wing is not clamped;

2. pressurizing the sample by adopting a pressurizing device which moves horizontally, wherein the pressure direction is the horizontal direction and is vertical to the plane of the sample fixing wing;

3. the pressurizing device consists of a pressing block and a prepressing plate, and the prepressing plate fixes the position of the sample without clamping wings before the sample is pressurized;

4. the motion power of the briquette is derived from the energy of compressed air;

5. the pressurizing pressure of the pressurizing device to the sample and the movement speed of the briquetting are controlled by adjusting the flow of the compressed air;

6. when the pressurizing device releases the pressure, the pressing block and the prepressing plate are connected into a whole through electromagnetic action and are separated from the surface of the sample together.

Drawings

FIG. 1 is a schematic view of sample clamping

FIG. 2 is a schematic view of the pressurizing process of the pressurizing device

FIG. 3 shows the change of the recovery angle of the sample in the recovery stage

Detailed Description

The invention relates to a pressurization method for measuring the wrinkle recovery angle of a fabric, which mainly comprises the steps of applying stable pressure to a sample along the horizontal direction, wherein the pressurization pressure and the pressurization time are controllable, and the accurate evaluation of the whole process of the wrinkle recovery angle of the fabric from the initial recovery moment in the recovery stage is realized.

The size of the sample is a rectangle of 40mm multiplied by 15mm, the top view of the fixing mode of the sample on the test bench refers to fig. 1, the long side of the sample is parallel to the horizontal plane, the wide side is vertical to the horizontal plane, the fixed wing of the sample is clamped by the metal sheet 1 and the fixed bench 2, and the other wing is in a free state when not pressurized;

the pressurizing device (refer to fig. 2) comprises a pressing block 3 and a prepressing plate 4, and the pressurizing device moves along the horizontal direction, and the moving direction is vertical to the plane of the sample fixing table 2 contacted with the sample;

the prepressing plate 4 is used for fixing the position of the sample without clamping wings before the sample is pressed, and is separated from the surface of the sample together with the pressing block when the sample is released from the pressure.

The power of the pressing block 3 for pressurizing the sample is derived from the energy of compressed air, the pressing block 3 is connected with a piston rod on the air cylinder, and the piston rod controls horizontal movement. The movement of the piston rod is controlled by the air pressure entering the two ends of the cylinder. The air inlet adjusting valve is connected with the air inlet openings at the two ends of the piston rod respectively, the air inlet adjusting valve controls the flow rate of compressed air entering the two ends of the air cylinder, the moving speed of the pressing block 3 is controlled by the air inlet adjusting valve, the compressed air controls the flow rate of the compressed air flowing into the air cylinder through the electromagnetic valve, the pressure of the pressing block 3 is controlled by the pressure reducing valve, and the pressure reducing valve can perform stepless regulation on the pressure of the pressing block.

The pressing method for measuring the wrinkle recovery angle of the fabric comprises the following steps:

1. placing a sample on a test bench, wherein one wing is clamped by a metal sheet 1 and a fixed bench 2, and the other wing is in an unbound state;

2. the prepressing plate 4 is close to the sample, so that the free wing and the fixed wing are in a folded state, and the position of the free wing is set by the prepressing plate 4, so that the crease line generated by the sample being pressed is ensured to be at a specified position;

3. adjusting an air inlet adjusting valve to enable a pressing block to slowly move towards a sample, wherein the moving speed is 0.02m/s, the sample is pressurized at constant pressure, the pressurizing pressure is controlled by a pressure reducing valve, the pressure regulating formula of the pressure reducing valve is shown as a formula (1), and the pressurizing time is determined by a time relay in a control circuit;

4. when the pressure time set by the time relay is reached, the pressing block 3 and the prepressing plate 4 are mutually attracted through electromagnetic action and jointly withdraw from the surface of the sample, and the withdrawal speed when the pressure device stops pressurizing is controlled by the air inlet adjusting valve, so that the withdrawal speed reaches 0.2 m/s.

The crease is formed on the sample through the steps, and after the pressurizing device stops pressurizing, the crease recovery condition of the sample, particularly the resilience performance at the initial recovery moment can be obtained.

The pressurization method adopted by the invention can realize the adjustment of the pressurization pressure and the pressurization time, taking the following experiment as an example, the parameters of the pressurization pressure are set to be 3N, 5N, 10N and 15N, the parameters of the pressurization time are set to be 3min, 4min and 5min, and the detailed experiment parameter design is as listed in Table 1.

TABLE 1 pressurization parameter settings

The samples shown in Table 2 were tested by the pressurizing method of the present invention, and the test results are shown in Table 3.

TABLE 2 sample parameters

TABLE 3 test results for different pressing parameters

The data presented in table 3 are the mean recovery angle and standard deviation at 300s of the recovery phase for 5 samples of the same conditions. As can be seen from the average recovery angle, the recovery angle becomes smaller as the pressurizing time increases when the pressurizing pressure is constant. And the test result is compared with a Shirley crease recovery performance tester, and the result shows that the consistency of the result measured by the pressurization mode and the current method is higher. The method not only can measure the static recovery angle, but also can obtain the recovery condition of the sample in the whole process of the recovery stage. With 1^#The results of the fabric sample at test number 6 are shown as an example, and the angle change during the entire recovery process is shown in FIG. 3.

Through the above examples, it is proved that the pre-pressing plate 4 adopted by the present invention ensures that the crease line is parallel to the wide side of the sample, prevents the error of the crease position, and is convenient to operate.

The invention adopts air as a medium, is not easy to burn and is safer than a hydraulic medium, the air is spread all around, no extra cost is required to be paid to the medium, the exhaust treatment is simple, and the environment is not polluted; the mode is convenient for adjusting output force and working speed and has higher action speed than hydraulic and pneumatic modes; the mode has higher reliability and long service life.

Those of ordinary skill in the art will understand that: the invention is not to be considered as limited to the specific embodiments thereof, but is to be understood as being modified in all respects, all changes and equivalents that come within the spirit and scope of the invention.

Claims

1. A pressurization method for measuring the wrinkle recovery angle of fabric is characterized by comprising the following steps:

(1) placing a rectangular sample on a test bench, wherein the long edge of the sample is parallel to a horizontal plane, the wide edge of the sample is vertical to the horizontal plane, one wing is clamped and fixed, and the other wing is not clamped;

(2) pressurizing the sample by adopting a pressurizing device which moves horizontally, wherein the pressure direction of the pressurizing device is the horizontal direction and is vertical to the plane of the sample fixing wing;

(3) the pressurizing device comprises a pressing block and a prepressing plate, and the prepressing plate fixes the position of the sample without a clamping wing before the sample is pressurized;

(4) the motion power of the briquette is derived from the energy of compressed air;

(5) controlling the pressurizing pressure of the pressurizing device to the sample and the movement speed of the briquette by adjusting the flow of compressed air;

(6) when the pressurizing device releases the pressure, the pressing block and the prepressing plate are connected into a whole through electromagnetic action and are separated from the surface of the sample together.

2. The method of pressurizing according to claim 1, wherein the specimen does not need to be changed in clamping position during the test.

3. The pressing method according to claim 1, wherein the pre-pressing plate can ensure that the crease line is parallel to the wide edge of the sample, prevent the crease from being positioned incorrectly and facilitate the operation.

4. The pressurizing method according to claim 1, wherein the recovery angle of the sample at the initial stage of recovery can be obtained, and the whole process of recovery of the sample can be evaluated.