Textile fabric pilling test box method experimental process

1.Scope

This standard specifies the method of using a pilling box to determine the degree of pilling of fabrics without pressure.

Comply with standards: GB/T 4802.3-1997 replaces GB 4802.3-84. This standard is applicable to most fabrics, and is more suitable for wool needle woven fabrics.

2. Reference standards

The provisions contained in the following standards constitute provisions of this standard through reference in this standard. At the time of publication, the editions indicated were valid. All standards are subject to revision and parties using this standard should explore the possibility of using the latest version of the following standards. GB6529-86 Standard atmosphere for humidity conditioning and testing of textiles GB8170-87 Numerical rounding rules

3.definition

This standard uses the following definition.

3.1 Pilling After friction, the fiber ends of the pilling fabric protrude from the surface and become entangled with each other to form small balls of fluff.

3.2 Pilling resistance The ability of the fabric to resist pilling.

4.principles

According to the specified method and parameters, put the fabric sample on the polyurethane plastic tube and put it into a rotating square wooden box lined with rubber cork for rolling. Under specified lighting conditions, compare the rolled sample with the standard sample to evaluate the pilling grade.

5.devices

5.1 Pilling box: square wooden box, the inner wall is lined with 3.2mm thick rubber cork, and the length of each side of the unlined inner wall is 235mm. The box speed is 60r/min.

5.2 Polyurethane sample tube, weight 50g, length 140mm, diameter 30mm.

5.3 Use a 114mm square sample punch, or use a template, pen, or scissors to cut the sample. Approved by the State Bureau of Technical Supervision on 1997-06-09 and implemented on 1997-12-01

5.4 Sewing machine.

5.5 Tape paper.

5.6 Standard photos: Standard photos are a five-level system.

5.7 rating box

6.Regulator wet and test atmosphere

Atmospheric humidity conditioning, humidity conditioning and testing are carried out in accordance with the standards specified in GB 6529. The arbitration test adopts the secondary standard atmosphere.

7.specimens

7.1 The sample is humidified under the standard atmosphere for testing.

7.2 Randomly cut the sample at an upper and lower position 10cm away from the edge of the fabric. There should be no defects on the sample that would affect the test results.

7.3 Cut four pieces of 114mm×114mm specimens, fold them in half with the test side facing inward, and sew them into a specimen cover with a sewing machine at a distance of 6mm from the edge (see Figure 1). There are two longitudinal (meridian) sample sets and two transverse (weft) sample sets.

7.4 Turn over the sewn sample cover so that the fabric test side faces outward.

7.5 The sample is placed on the sample tube under uniform tension. The seam edges of the sample cover should be flat and spread apart on the sample tube.

7.6 In order to fix the position of the sample on the sample tube and prevent the sample from loosening, wrap the edge of the sample with tape (the length shall not exceed one and a half circles of the sample tube).

8.test steps

8.1 Before the test, the pilling box must be clean, and no short fibers or other substances that may affect the test should be left.

8.2 Put the four carrier tubes with specimens in them into the box, close the box lid firmly, and pull out the counter to the required number of rotations.

8.3 The preset revolution number is 7200r for coarse woven fabrics and 14400r for worsted fabrics or the number of revolutions according to the agreement.

8.4 Start the pilling box. When the counter reaches the required number of revolutions, remove the sample from the sample tube and remove the sutures; unfold the sample and compare it with the rating standard sample to evaluate the pilling procedure of each sample. Expressed as the nearest 1/2 level.

9.results

The pilling grade of the sample is expressed as the average value (level) of four samples. Calculate the average and round to two decimal places. If the decimal part is less than or equal to 0.25, go to the next level (for example, 2.25 is level 2); if it is greater than or equal to 0.75, go to the next level (for example, 2.85 is level 3); if it is greater than 0.25 and less than 0.75, take 0.5 .

10.Test report

Explain that the test was conducted according to the standard and report the following:

a) The name, specifications and batch number of the sample;

b) Test date;

c) Test conditions;

d) Model of the instrument

e) Pilling level

f) Any details that deviate from this standard and abnormal phenomena during testing must be explained.

Appendix A (standard appendix)

Pilling boxes and accessories

A1 rubber cork lining

After a period of use, the surface of rubber cork may become smooth or adhere to grease, softener and finishing agent. These changes will reduce the degree of pilling. When this happens, wiping the rubber cork with methanol should restore the original pilling performance; if it still fails after wiping, the rubber cork lining must be replaced.

Method for determination of friction properties of rubber cork surfaces (see Appendix B). After a new pilling box is started or a new lining is replaced, the friction properties of the rubber cork surface lined in the pilling box must be measured to determine the changes in the surface friction coefficient after use and to understand the service life of the rubber cork. When the friction coefficient of rubber cork drops below 1/2 of the original value, it needs to be replaced with new rubber cork.

A2 sample tube

It is necessary to check whether the new sample tube has any traces of the model during manufacturing, and the convex surfaces at both ends must be smooth.

A3 check

The pilling performance of the instrument can only be checked directly with fabric. A certain number of two or more fabrics of different grades (from grade 1 to grade 4) should be selected as reference fabrics. Regularly or when necessary, use the reference fabric for testing, compare with the original sample, and determine the differences and changes in pilling boxes or the same pilling box.

Appendix B

(Appendix to the standard) Method for determination of surface friction properties of rubber cork linings

Measuring the surface friction properties of rubber cork can be used to judge the pilling tail energy of the pilling box. It is important to check the friction properties of the rubber cork surface regularly after starting a new pilling box, replacing the rubber cork lining, or during use.

B1 Equipment and Supplies

B1.1 A wooden block with a volume of 115mm×55mm×15mm and a weight of about 55g, and a string for weighing the plate.

B1.2 200g weight.

B1.3 Pulleys and pulley devices (see Figure B1). Figure B1 Device for measuring friction performance

B2 Operating Procedures

B2.1 When verifying the rubber cork lining, it must be placed on a horizontal surface (see Figure B1).

B2.2 As shown in Figure B1, place the wooden block, 200g weight, weighing plate and pulley device, and the connection line should be parallel to the plane.

B2.3 Add weights to the weighing pan until the wooden block begins to move at a constant speed on the surface of the rubber cork lining. When adding weights to the weighing pan, do not impact the weighing pan.

B2.4 Use formula (B1) to calculate the friction coefficient CF of the rubber cork surface:

CF=(Mass of the weighing pan (g) + Mass of the weight on the weighing pan (g)) / (Mass of the wooden block (g) + Mass of the weight pressed on the wooden block 200g)------------------B1

 

Email: hello@utstesters.com

Direct: + 86 152 6060 5085

Tel: +86-596-7686689

Web: www.utstesters.com

Characteristic Composition And Working Principle Of Multihead Weigher

Multihead weigher

Source of multihead weigher

In the 1970s, the Japanese Agricultural Association asked weighing companies to weigh green peppers. In Japan, green pepper is usually packaged in bags in the form of quantitative packaging in supermarkets, if each bag of green pepper quantitative value is 120 grams, it is very difficult to fill 120 grams. As a single green pepper weight is heavier, and the difference is larger, less related to the interests of consumers, more related to the cost of the enterprise. The traditional way is manual weighing, that is, weighing on a static electronic scale, add up to 115 grams of green pepper one by one, and then it is almost impossible to find a 5 grams of green pepper to add, you must take a smaller green pepper from 115 grams, and add another larger green pepper. If the weight is much more than 120 grams or less than 120 grams, the above work needs to be repeated, so the weighing efficiency is very low, and it is difficult to achieve close to the target weight (quantitative value) results. After a lot of investigation and research, the technical personnel successfully solved the weighing problem of green pepper by using the combination weighing principle. Some large food enterprises will be its designated equipment.

Composition of multihead weigher

The basic composition of the combined scale is: main vibration plate, main vibration machine, line vibration plate, line vibration machine, hopper, weighing bucket, chute, hopper (optional), stepping motor, driving board, module conversion device, main control board.

Working principle of multihead weigher

1. The material is sent to the storage hopper by the material conveyor. When the material is added to the pre-set horizontal position, the electronic eye on the side of the storage hopper detects and sends out a signal to make the conveyor stop feeding until the material level on the storage hopper drops to the preset horizontal position, and then the electronic eye sends out the feed signal;

2.The material in the storage hopper, through the vibration of the main vibration machine to make the material from the main vibration plate evenly into the line vibration plate, to feed the line vibration plate;

3.The vibration of the line vibrator causes the material to be discharged from the line vibrator and into the hopper for storage;

4.When the weighing bucket completes the last weighing and emptying, the upper hopper is opened to make the material enter the weighing bucket for weighing. The output signal is transmitted to the motherboard of the control device through the lead wire. The CPU on the motherboard reads and records the weight of each weighing bucket, and then selects the combination weighing bucket closest to the target weight through calculation, analysis and combination.

5.When the feeding signal is allowed, the CPU issues a command to start the driver to open the selected weighing bucket, the material is sent through the chute into the hopper or directly into the packaging machine, and the feeding signal has been sent to the packaging machine to complete the weighting packaging system.

 

The Revolution of Multihead Weighers in the Food Packaging Industry

In the world of food packaging, accuracy, speed, and efficiency are crucial elements for success. To meet these demands, the industry has witnessed the rise of a remarkable technology called the Multihead Weigher. It has revolutionized the way products are weighed and packaged, offering unparalleled precision and productivity. In this blog post, we will delve into the workings of multihead weighers and explore their impact on the food packaging industry.

What is a Multihead Weigher?

A Multihead Weigher is a cutting-edge weighing system that employs advanced technology to accurately measure and distribute a wide variety of food products. It consists of several independent weighing heads, each equipped with its own load cell. These heads work together in synchronization, allowing for high-speed weighing and packaging operations.

How does it work?

The multihead weigher operates through a three-step process: weighing, calculation, and distribution. First, the product is fed into the multihead weigher, where it is divided into individual portions by the weighing heads. Each head simultaneously measures the weight of its designated portion using load cells and sends the data to a central processing unit.

Next, the central processing unit calculates the optimal combination of portions to achieve the desired target weight. It configures the distribution paths to ensure the accurate allocation of portions, taking into account factors such as the characteristics of the product and the packaging requirements.

Finally, the calculated portions are distributed to the packaging machine, which fills the individual packages rapidly and precisely. This seamless process ensures that each package contains the correct weight, minimizing product giveaway and maximizing efficiency.

Advantages of Multihead Weighers:

Precision: Multihead weighers are renowned for their exceptional accuracy, even with complex products like mixed nuts, snacks, or frozen foods. This accuracy results in consistent product quality and customer satisfaction.

Efficiency: With their high-speed weighing capabilities, multihead weighers significantly increase productivity. They can handle large volumes of product, reducing production time and labor costs.

Versatility: Multihead weighers are adaptable to various food product types, sizes, and shapes. They can handle both dry and wet products, making them suitable for a wide range of applications in the food packaging industry.

Hygiene and Food Safety: Multihead weighers are designed with food safety in mind. They feature smooth surfaces and removable parts for easy cleaning, promoting hygiene standards and reducing the risk of contamination.

Impacts on the Food Packaging Industry:

The integration of multihead weighers has had a transformative effect on the food packaging industry. It has brought about increased operational efficiency, improved packaging quality, and reduced product waste. The precise weighing and distribution capabilities of multihead weighers have also enabled manufacturers to meet stringent regulatory requirements and maintain compliance with industry standards.

Furthermore, the automation and speed provided by multihead weighers have facilitated streamlined production processes. This has allowed companies to scale their operations, penetrate new markets, and meet the growing demand for packaged food products.

Conclusion:

The advent of multihead weighers has revolutionized the food packaging industry, offering unparalleled accuracy, efficiency, and versatility. As technology continues to advance, we can expect further enhancements in multihead weighers' capabilities, enabling manufacturers to meet evolving consumer demands and achieve greater success in the competitive market.

Whether it's ensuring the consistent weight of a bag of chips or accurately portioning delicate confectionery treats, multihead weighers will continue to play a crucial role in the future of food packaging.