Bagged Bitumen Melting Equipment KRD-30 KRJ-40 (2-6t/h High-Performance Patented Melting Unit)

bagged bitumen melting equipment KRD-30 & KRJ-40 is our self-developed patented packaged bitumen melting system. It adopts composite temperature-controlled heating and hot-cutting melting technology, and can work alone or multiple units in combination. This unit handles packaged bitumen, imported bitumen, color bitumen and other special bitumen, widely used for road construction material preparation. All units are inspected in Dezhou factory before shipment.

Key Features & Working Principle

This series applies composite temperature-controlled heating, including thermal-oil constant-speed heating and direct rapid heating, two modes can be controlled separately. Thermal-oil heating keeps temperature within bitumen aging critical point to prevent bitumen deterioration. Direct rapid heating provides high-efficiency temperature rising when thermal convection is smooth.

The built-in hot-cutting structure of this unit cuts bulk cold bitumen into small blocks or sheets, expanding heating contact area and improving melting efficiency. The design of high-low double oil outlets on this unit allow simultaneous feeding and discharging, realizing non-stop continuous production. Users can run a single set or connect several units together according to actual project demands.

Model Comparison of the bagged bitumen melting equipment: KRD-30 VS KRJ-40

KRD-30
It is the solution for small and medium-size packaged bitumen. Compatible with 25-50 kg small bags and 1000-1200 kg ton-bags. Feeding speed reaches 2-5 t/h with bitumen storage volume above 30 m³. Total heating value is 60 ten-thousand kcal and total installed power is 29 kW.

KRJ-40
Specially designed for 20-ton flexible container liquid-bag bitumen. Its inlet size adapts to standard 17-meter flat-bed truck loading. Feeding speed is 5-6 t/h and bitumen storage volume exceeds 40 m³. Total heating value is 90 ten-thousand kcal and total installed power is 32 kW.

Configuration Options

There is no extra complicated optional configuration for this series. Customers select model according to bitumen package type and required melting speed. Multi-unit combination can be adopted when higher total throughput is required.

Factory Test & Export Terms

Every machine will complete assembly inspection and factory test run before delivery. We support container shipment under FOB Qingdao. Operation manual and technical documents will be provided for overseas clients.

Table 1: KRD-30 Main Technical Specifications.

Item	Unit	Parameter	Remarks
Melting kettle feeding rate	t/h	2-5
Asphalt storage quantity	m³	＞30
Thermal oil operating temperature	℃	200-220
Thermal oil capacity	kg	500
External dimensions (L×W×H)	cm	11600×2300×2550
Total equipment heat output	×10⁴ kcal/h	60
Total equipment power	KW	29

Table 2: KRJ-40 Main Technical Specifications.

Project	Unit	Parameter	Remarks
Melting kettle feeding rate	t/h	5-6
Asphalt storage quantity	m³	＞40
Thermal oil operating temperature	℃	200-220
Thermal oil capacity	kg	1200
External dimensions (L×W×H)	cm	12280×2680×2550
Total equipment heat output	×10⁴ kcal/h	90
Total equipment power	KW	32

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Composite Heating: Why It Prevents Ageing

Melting packaged bitumen is a compromise between speed and damage. Heat applied too slowly makes the unit a bottleneck; heat applied too aggressively overheats the binder at the point of contact and ages it before it ever reaches the mixer. The KRD-30 and KRJ-40 resolve the conflict with a composite temperature-controlled heating system that combines a thermal-oil constant-speed circuit with a direct rapid-heating circuit, each independently controlled.

The thermal-oil side holds the melting chamber within a band that sits below the critical point at which bitumen begins to age significantly, so the bulk of the melting happens without thermal damage. The direct-heating side provides the fast temperature rise that keeps throughput up when the unit is asked to work at its rated rate. Working thermal-oil temperature is 200–220 °C, with the KRD-30 carrying 500 kg of oil and the KRJ-40 carrying 1200 kg.

Hot-Cutting Technology and Why It Speeds Melting

The second half of the melting problem is geometry. A sealed bag of bitumen presents a large mass with a small surface area, so heat has to conduct inward and the melt rate falls away as the block shrinks. The hot-cutting device addresses this directly: it cuts the bulk low-temperature asphalt into small pieces and sheets, which multiplies the surface area exposed to the heated chamber and accelerates melting without raising the temperature.

The effect is visible in the throughput figures. The KRD-30 melts at 2–5 t/h and holds more than 30 m³ of asphalt storage, while the KRJ-40 reaches 5–6 t/h with more than 40 m³ of storage capacity. Both figures are achieved without a corresponding increase in chamber temperature, which is what keeps the ageing risk contained.

Choosing Between the KRD-30 and the KRJ-40

• KRD-30 — handles 25–50 kg small bags and 1000–1200 kg ton bags, with a feeding speed of 2–5 t/h, more than 30 m³ of asphalt storage, 500 kg of thermal oil, 60 × 10⁴ kcal of total heating value and 29 kW of installed power.
• KRJ-40 — designed for the 20-ton flexible container bag, with a feeding speed of 5–6 t/h, more than 40 m³ of storage, 1200 kg of thermal oil, 90 × 10⁴ kcal of heating value and 32 kW of installed power.

The decision follows the packaging your suppliers actually deliver. A plant receiving mixed small bags and ton bags needs the KRD-30’s wider packaging tolerance; an operation built around 20-ton container bags needs the KRJ-40’s higher throughput and larger storage and heating capacity. Because the models share the same melting principle and can be combined, a site that starts with one model can add capacity later by running units in parallel rather than replacing the original machine.

Continuous Feed and Discharge

Both models use high-low double oil outlets, which allow feeding and discharging to happen at the same time. That is what makes continuous operation possible: the discharge tap draws from the lower level while fresh material is still melting above it, so the downstream process receives a steady flow rather than a batch-by-batch pulse. A plant feeding a batching station or an emulsification line benefits directly, because the buffer requirement between the melter and the next process is smaller when the supply is continuous.

The same double-outlet arrangement is what makes multi-unit operation practical. Two units running in parallel can be phased so that their maintenance windows do not coincide, which keeps molten bitumen available even while one machine is being serviced.

Applicable Materials and Site Integration

The series handles packaged asphalt, imported asphalt, color asphalt and special asphalt, which covers the range of materials a plant is likely to receive in bagged or container form. Because the melting chamber is temperature-controlled rather than simply heated, color and special grades can be processed without the discolouration or property loss that uncontrolled heating would cause. A modest utility-model patent, ZL202021750490.4, covers the bagged asphalt fast-melting arrangement.

The unit works either as a stand-alone melting station or as part of a larger process, and it is normally installed close to the point of use so that molten bitumen does not have to travel far while hot. Where the site also runs an emulsification or foaming line, keeping those units within a short pipe run of the melter reduces the heat loss that otherwise has to be made up at the downstream equipment.

Bagged Bitumen Melting Equipment Installation and Maintenance

Installation requires a firm level base, the thermal-oil circuit filled and checked for leaks, and the electrical supply connected to the control panel — the KRD-30 draws 29 kW and the KRJ-40 32 kW in total. Because the thermal-oil circuit is central to the melting process, the oil level and quality check is the single most important routine item; oil that has degraded transfers heat less efficiently and shows up first as a longer melting time at unchanged settings.

Beyond the oil circuit, the daily routine covers the bag residue screen, the transfer pump and the temperature instrumentation. Cleaning the screen at every shift is worth the effort it takes, because a partially blinded screen forces the chamber to run hotter to maintain throughput, which is exactly the condition the composite heating system is designed to avoid. Both models are built at the LIJIU works in Dezhou and quoted FOB Qingdao.

Product images

Related equipment and guides

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• LIJIU Emulsified Asphalt Equipment LRA-LRB-LRC Series (6-15t/h Modified Bitumen Emulsification Plant)
• Colored Thin Pavement System Buying Guide: Water-Based 1-mm Greenway Overlay

Standards and references

Specifications on this page follow ASTM D6927 Standard Test Method for Marshall Stability. Ask us for the full test report when you request a quote.