HG/T 21556.3-1995 Polypropylene Ball Ring Packing HG/T21556.3-1995 Standard download decompression password: www.bzxz.net

Polypropylene Ball Ring Packing
HG/T 21556.3-95
1 Subject Content and Scope of Application
1.0.1 This standard specifies the structural dimensions, manufacturing, inspection, packaging, storage and transportation requirements of polypropylene ball rings (with inner ribs) with packing diameters of 16, 25.38, 50 and 76 mm. 1.0.2 The applicable temperature range of polypropylene ball ring packing is less than or equal to 100°C. 87
GB12670
ZBG91004
ZBG91005
ZBG 91006
《Polypropylene resin》
Reference standards
《Polypropylene ball ring packing drop hammer impact test method》《Polypropylene ball ring packing compression test method》《Polypropylene ball ring packing long-term thermal deformation test method》3 Marking, specifications and characteristics
XXX.X-XXPRPP-X×
Nominal diameter
Polypropylene ball ring
Standard number
3.2 Specifications and characteristics
Polypropylene ball ring is a cylinder with a plurality of windows on the surface of equal height and diameter. There are 3.2.1
ribs inside, and the appearance is shown in Figure 3.2.1.
Figure 3.2.1 Polypropylene Ball Ring
In the figure: the unit of dimensions is mm: D
-diameter; H-
height; - wall thickness.
3.2.2 The nominal diameters of the commonly used ball rings in industry are DN16, DN25, DN38, DN50, and DN76mm.
The main specifications and dimensions of the polypropylene ball ring should meet the requirements of Table 3.2.3. Table 3.2.3 Specifications and dimensions of polypropylene ball ring packing
The characteristic parameters of polypropylene ball ring shall comply with the requirements of Table 3.2.4Table 3.2.4
Characteristic parameters of polypropylene ball ring packing
Diameter×height×wall thickness
16×16×0.8
25X25×1.2
38×38×1.4
50×50×1.5
76×76×2.6
Specific surface area
(m2/m\)
Stacking number
177600
Note: The density of polypropylene is 910kg/m2. Void ratio
(m2/m°)
Bulk density
(kg/m*)
The physical and chemical performance indicators of polypropylene ball rings shall meet the requirements of Table 3.2.5. 90
Ovality deviation
Not more than
Dry filling factor
Physical and chemical performance indicators of polypropylene ball rings
Drop hammer impact
(kgf·m)
Compression resistance
Long-term thermal deformation
4.0.1 The material shall be homopolymer polypropylene injection molding resin granules and shall meet the requirements of GB12670 standard. The technical indicators shall meet the requirements of Table 4.0.14.0.2 The selected materials must have a certificate of conformity and the chemical composition of the materials. Table 4.0.1 Properties of polypropylene resin
Melt index
Isotactic index
Apparent densitywww.bzxz.net
Ash content in powder
Test method
GB3682
GB2412
GB1636
GB9345
g/10min
Natural color granules
Manufacturing requirements
5.0.1 The structural dimensions of polypropylene ball rings are shown in Figure 5.0.1 and Table 5.0.1. A
Figure 5.0.1 Manufacturing dimensions of propylene ball ring
In the figure: the unit of dimensions is mm; H.--width; H,--window width or rib width H--upper and lower row window hole spacing E
upper and lower edge width; F-rib width H--height, D--diameter, .. wall thickness, B--window hole spacing
nominal diameter
Manufacturing dimensions of polypropylene ball ring
1.5±0.2
5.0.2 Processing adopts injection molding. The appearance of the finished product should be round, without warping or cracks. The surface of the filler should have no fusion marks or bubbles. The edge of the filler is required to be smooth and free of burrs. 94
6 Inspection and acceptance
6.1 Acceptance rules
6.1.1 The filler should be accepted in batches, and one size of filler can be regarded as a batch. The number of batches is shown in Table 6.1.1. When the production volume of a size of filler is less than the batch value specified in Table 6.1.1, the production volume of a size of filler can be used as a batch.
Table 6.1.1 Number of fillers in batches
Nominal diameter DN (mm)
Less than 38
Batch size (m\)
6.1.2 The number of samples for each batch of fillers used for inspection shall not be less than 60. 6.1.3 If more than 5% of the appearance dimensions of the sampled fillers do not meet the requirements of this standard, it is necessary to double the sampling volume from the same batch of products and retest. The results of the repeated tests are applicable to the same batch of products. If the unqualified rate of the retested samples is still greater than 5%, the batch of products is unqualified. 6.2 Inspection method
6.2.1 The diameter, wall thickness and height of the filler are measured with a vernier caliper, and each measurement item of each sample shall not be less than 2 measurement points. The measurement value requirements are shown in Table 3.2.3. 6.2.2 Use a vernier caliper to measure the ovality of the packing. Two mutually perpendicular diameters must be measured for each sample. The ovality is determined by the difference between the two mutually perpendicular diameters. The measurement value requirements are shown in Table 3.2.3. 6.2.3 Place the right angle meter on the end face of the packing, and use a feeler gauge to measure the gap between the right angle meter and the edge of the packing end face to determine the inclination deviation of the end face. The verticality deviation should be less than 1%. 95
6.2.4 Measure the drop hammer impact, compression resistance and long-term thermal deformation of the ball ring packing according to ZBG91004, ZBG91005 and ZBG91006 standards. 6.2.5
When changing the shape and size of the packing, it is necessary to perform packing property tests, including fluid mechanics tests and mass transfer performance tests.
7 Marking, packaging and storage and transportation
7.1 Marking
7.1.1 The product packaging should be accompanied by a packing list and a product certificate. The product certificate should indicate: product name, specifications and dimensions, production date, physical and chemical performance test results, inspection date and seal of the inspector, and manufacturer name.
7.1.2 The outer packaging box of the product should indicate: product name, mass (kg), product mark, manufacturer name, and words or signs such as "strictly prevent pollution" and "do not press heavily". 7.2 Packaging
7.2.1 The packaging container should be a dry box lined with polyethylene film or a polypropylene woven bag lined with polyethylene film. The packaging bag should be dustproof and its seal should ensure that the product is not contaminated during transportation and storage. 7.2.2 The packaging container must be strong enough to withstand multiple handling and loading and unloading, and arrive at the destination safely and reliably.
7.3 Storage and Transportation
7.3.1 The filler shall not be exposed to the sun or rain during transportation, and shall not be mixed with pollutants such as soil, metal, kerosene, etc. during transportation. Tarpaulin must be used when transporting by car. 7.3.2 Fillers of different specifications and sizes shall be stored separately. The product shall be stored in a dry and non-corrosive place. It shall not be stored when the inner packaging is damaged. 97
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