Car seat cushion material performance test method
1 Subject content and scope of application
This standard specifies the physical and mechanical properties of molded (including cold plastic and thermoplastic) formed polyurethane foams.
experiment method.
This standard applies to molded car seat cushions, polyurethane foam for backrest.
2 QCT 56-1993 car seat cushion material performance test method reference standard
Standard environment for GB 2918 plastic sample conditioning and testing
GB 10802 flexible polyurethane foam
GB 6343 Determination of apparent density of foams and rubber
Determination of the resilience of GB 6670 flexible foam
GB 10807 soft foam polymer material indentation hardness test method
GB 6344 Determination of tensile strength and elongation at break of flexible foam polymers
Test method for tearing performance of GB 10808 flexible foam
GB 6669 Determination of compression set of flexible foamed polymeric materials
3 test items
This standard specifies the test methods for seven tests: apparent density determination, resilience energy measurement, and indentation.
Determination, tensile strength and elongation at break, determination of tear properties, compression set determination, repeated pressure
Shrink test.
4 General conditions of the test
The standard environment for test condition adjustment and test shall be in accordance with the normal standard environment specified in GB2918, ie temperature.
23±2°C, relative humidity (50±5)%, gas pressure 86-106kPa, and 16h state adjustment.
5 sampling method
5.1 Under normal circumstances, according to the provisions of GB10802, the sample is cut in the middle of the product after 72 hours of production. Sample not
Should be with a skin.
5.2 When one of the following conditions is true:
a. The product of the specified size cannot be obtained due to irregular shape or too small thickness;
b. Products with inserts or through holes for the skin to be installed in the middle.
Allows the same formulation and the same process conditions to be used in a standard size mold to meet the size requirements
The sample is sought and the material properties of the product are replaced by the properties of the sample.
The sampling method should be indicated in the test report.
5.3 The specimen should be marked with the direction of the force applied during actual use in the product, and used as the force for the test.
direction.
6 Test methods
6.1 Apparent density determination
According to the provisions of GB6343. The sample is a cube, the side length is 50 ± 2 mm, and the number of samples is 5. Balance
The minimum scale is 0.01g and the minimum scale of the vernier caliper is 0.1mm.
6.4 Determination of tensile strength and elongation at break
According to the provisions of GB 6344, the gauge length is 50mm, and the number of samples is not less than three.
6.5 Determination of tear properties
According to the provisions of GB 10808, the test machine has a no-load speed of 50mm/min and the number of samples is not less than three.
6.6 Determination of compression set
According to the method A specified in GB6669, the length of the four sides of the sample is 50±1mm, the thickness is 25±1mm, and the compression test
75% of the sample thickness, the number of samples is not less than three.
6.7 repeated compression test
6.7.1 The sample size shall be not less than 3 according to the provisions of GB 10807.
6.7.2 In order to compress the air quickly, the square horizontal plate supporting the sample is drilled with a diameter of 6.5mm.
Hole. In the range of supporting the sample, the holes are arranged in a matrix form, and the distance between the hole and the center of the hole is 20 mm. plus
The area of ​​the platen should be larger than the area of ​​the sample.
6.7.5 Remove the sample and place it for 30 minutes under the standard environmental conditions specified in Article 4, as specified in 6.7.3.
The method is to measure its thickness and 25% hardness and 50% hardness.
6.7.6 According to the measurement results, the repeated compression set rate and 25% hardness change are calculated according to the following formula.
Rate and 50% hardness change rate.
a. Repeated compression rate
b. 25% hardness change rate
c. 50% hardness change rate
QCT 56-1993 car seat cushion material performance test method
Car seat body pressure distribution measuring system
GCTY-A
product description:
Application of TYFB-A human body pressure analysis system in car seat design
This system is widely used to measure the pressure distribution of the human body in car seats and office chairs. The information obtained can be used to improve the design of the seat and improve comfort. Not only does the system have access to dynamic data, but it is also extremely portable, so measuring in a moving car is as easy as measuring in the lab.
Product Usage:
Scan the pressure distribution of the human body on the seat
Seat design and development
Comfort study
Measuring pressure changes over time, contact area and peak area
Measuring sewing, padding, wiring, foam hardness, seat angle, lumbar support and packaging materials
Product Features:
Optimize foam hardness and packaging materials
Choose the best ergonomic position for the driver
Detecting the comfort of passengers entering and leaving
Measuring changes in driver position when driving a large amount of activity and driving for a long time
QCT 56-1993 car seat cushion material performance test method
Cash Register Paper
Cash register paper, as the name suggests, refers to the paper roll used in the cash register to record cash register details. It is mainly used to provide customers with a list of shopping details and can be replaced after use.
Generally, the material of the cash register paper is the corresponding material suitable for the internal printing parts of the cash register. For ordinary stylus printers, ordinary 1-3 layers of printing paper can be used for printing; for thermal head printers, only thermal printing paper can be used for printing.
Ordinary dot matrix printers require printing consumables such as ribbon and cash register paper.
Thermal head printers can print only by using thermal printing paper, without other auxiliary consumables.
The Different type of cash register paper
1. Double-adhesive paper: cash register paper produced by ordinary double-adhesive paper, all of which are single-layer, without any coating on the paper, and printed on the cash register paper with a ribbon.
2. Thermal paper: cash register paper produced by thermal paper processing, all of which are single-layer, coated with thermal chemical coating on the surface of the paper, the paper is printed with a laser thermal head to color cash register paper, its characteristic is not Printing consumables do not use ribbons, ribbons or ink cartridges; moreover, the surface of the paper is relatively smooth, and there will be clear marks when scratched on the paper with nails or hard objects.
3. Carbonless Paper: This kind of cash register paper consists of at least two layers or more. The first page needs to be printed with a needle printer for color development, but the next few pages are developed by the printing pressure of a needle printer.
4. Self-sensing paper: This kind of cash register paper is composed of one or more layers, and the color is developed by the printing pressure of the needle printer, and the printing paper does not need to install the ribbon. The first page of this cash register paper is called self-induction paper, and the following pages are ordinary carbonless paper.
Cash Register Paper,Cash Register Roll,Register Paper Rolls,Cash Register Paper Rolls
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