Plastic Conjugate Ring

Plastic conjugate ring is a modern, high-efficiency random tower packing that combines the strengths of saddle and ring packings in one shape. It uses a conjugate curved-fin body with fringed, toothed ends and an even length-to-diameter ratio, so the pieces touch each other and the tower wall only at points. That point contact stops the rings nesting or overlapping, which keeps the porosity uniform and very high, around 94 to 97 percent, and gives excellent fluid dynamics and mass transfer at a low pressure drop. It is produced in PP, RPP, CPVC, PVDF and PVC, comes light and easy to load, and is offered from 25 up to 100 mm.

Combines the advantages of saddle packing and ring packing in a conjugate curved-fin shape.
Fringed ends and point contact stop nesting, keeping porosity uniform and high (about 94 to 97 percent).
Excellent fluid distribution and mass transfer at a low pressure drop.
Available in PP, RPP, CPVC, PVDF and PVC; light and easy to load.
Used in petroleum, chemical, chlor-alkali and environmental towers; supplied from 25 up to 100 mm.

Technial Parameters

Spec	Pieces per m³	Surface area (m²/m³)	Void fraction (%)
φ25	75,000	185	95.3
φ38	16,000	116	95.7
φ50	9,700	86	96.6
φ76	2,480	81	94.8
φ100	1,800	76	94.1

Property	Value
Product Type	Plastic random packing (conjugate ring)
Material	PP / RPP / CPVC / PVDF / PVC
Model NO.	RJ-2328
Colour	Cream
Standard Sizes	25, 38, 50, 76, 100 mm
Structure	Conjugate curved fins with fringed ends; a saddle-and-ring hybrid
Void Fraction	About 94–97%
Contact	Point contact between pieces and wall — no nesting or overlap
Media Temperature	About 60–150 °C (by plastic)
Advantages	High mass transfer, uniform porosity, low pressure drop, corrosion-resistant, light
Applications	Petroleum, chemical, chlor-alkali and environmental filling / absorption towers
Trademark	RONGJIAN
Origin	China
HS Code	8419909000
Transport Package	Carton box / ton bag / steel drum

FAQs

How does the conjugate ring combine saddle and ring packing?

The conjugate ring earns its name by combining two older packing shapes in one body. From saddle packing it takes open, curved surfaces that spread liquid smoothly and offer little resistance; from ring packing it takes a compact, self-supporting body with good capacity. The two are merged in a conjugate curved-fin shape whose ends are fringed with small teeth. Those teeth and the ring's balanced proportions mean the pieces rest against one another, and against the tower wall, only at points, so they never nest or stack together. The bed that results has a very even, very open structure — porosity around the mid-nineties in percent — which is what gives the conjugate ring its high throughput and efficiency.

Which industries and duties is the conjugate ring made for?

Plastic conjugate rings are used as filling in absorption, scrubbing and mass-transfer towers across the petroleum, chemical, chlor-alkali and environmental-protection industries. Made from polypropylene and the other packing plastics, they hold up in harsh, corrosive service and last a long time, which keeps maintenance low. Their strong suit is fluid dynamics: the open, non-nesting bed distributes gas and liquid evenly and moves large volumes at a low pressure drop, so they lift the efficiency and capacity of a column. Wherever a plant wants a light, corrosion-resistant packing that performs better than plain rings, the conjugate ring is a good fit.

Which resin should I choose, and what heat can it stand?

The resin decides how much heat and chemical attack the ring can take. Polypropylene is the standard, low-cost pick and copes with most acids, alkalis and salts; reinforced polypropylene adds stiffness for taller beds. Where the stream carries chlorine or hot acid, CPVC holds up better than ordinary PVC, and PVDF is the grade to reach for when temperatures climb or the chemistry turns oxidising. As a rough guide the ring works with process fluids somewhere between 60 and 150 degrees, the low end for PVC and the high end for PVDF. Send through the fluid, its concentration and its running temperature, and we can match a grade to it.

How does a conjugate ring compare with Pall and Raschig rings?

The conjugate ring belongs to the newest generation of random packings, a step beyond both the Raschig ring and the Pall ring. The Raschig ring is a plain cylinder and the least efficient; the Pall ring improved on it by cutting windows into the wall to raise capacity and cut pressure drop. The conjugate ring goes further by blending saddle and ring geometry and using fringed, point-contact ends, so its bed is even more open and even more resistant to nesting and channelling. In practice that means more capacity, a lower pressure drop and better distribution than a Pall ring of the same size. Where a plain Raschig or Pall bed is holding a column back, the conjugate ring is the modern replacement. Give us the current packing and the bottleneck, and we can work through the comparison with you.

The plastic conjugate ring is a third-generation random packing, designed to outperform the plain Raschig ring and the windowed Pall ring that came before it. Its trick is to combine two different packing shapes. Saddle packings are open and curved, and they spread liquid gently with little flow resistance; ring packings are compact and strong, with good capacity. The conjugate ring fuses the two into a curved-fin body with toothed, fringed ends and a balanced length-to-diameter ratio. Because of that shape the pieces meet each other, and the tower wall, only at points, so they cannot nest or lie flat against one another — the bed stays open and its porosity stays uniform and high, in the mid-nineties in percent.

It is easiest to understand as the sum of what it borrows:

Borrowed from	What it contributes
Saddle packing	Open curved surfaces that spread liquid evenly at low resistance
Ring packing	A compact, self-supporting body with good capacity and strength
Conjugate fins and fringed ends	Point contact only — no nesting or overlap, uniform porosity

Produced in PP, RPP, CPVC, PVDF and PVC, the conjugate ring is light, shrugs off corrosion and drops easily into a column; the plastic it is moulded from sets its heat limit, somewhere between 60 and 150 degrees. Its open, high-void bed and even distribution give it more capacity, a lower pressure drop and better mass transfer than a Pall ring of the same size, which is why it serves as high-performance filling in petroleum, chemical, chlor-alkali and environmental towers. For a new column, or to uprate one that an older packing is holding back, it is a straightforward and effective choice. Send us the column diameter, the service and the operating temperature, and we can size the packing and choose the grade for you.