CNG ENGINEERING LTD is a representative of D&G MACHINERY. See more here

D&G MACHINERY, founded in 1999, is a subsidiary of D&G Technology Holding Company Limited, which is listed on the Hong Kong Stock Exchange (stock code: 1301). The company is a leading manufacturer and supplier of high-tech asphalt mixing plants and environmentally friendly asphalt recycling plants.
Product range and production capacity
The company offers a wide range of products, including:
• Conventional, containerized and mobile asphalt plants.
• Asphalt recycling plants with recycled material (RAP) capacity from 15% to 100%.
The main production base is located in Langfang City, China, and covers an area of ​​200,000 m². The annual production capacity exceeds 100 units.
Achievements and Innovations
• D&G MACHINERY has been included in the “Top 100 (plus 50) of the world’s construction machinery manufacturers” ranking for three consecutive years since 2021.
• Its products are designed to meet various technical requirements in different regions around the world.
• The company focuses on high screening efficiency, precise dosing and effective heating of materials.

CNG ENGINEERING EOOD is the official representative of OKUR for Bulgaria.

We would like to introduce you in a few steps the activities of OKUR and what it will offer on the Bulgarian market through its official representative in our person: CNG ENGINEERING EOOD.

OKUR Company was established by ABDULLAH OKUR in Ankara in 1970 and is currently managed by the second generation of the Okur family. The company has gained knowledge and experience in various fields of production since its establishment until today, but has especially improved in the field of bitumen/asphalt machinery and equipment. For nearly half a century, we have a well-deserved place in the national and international market.

The Okur family follows several principles:

-to satisfy customer needs at the highest level with after-sales service and complete customer-oriented production. All efforts are aimed at increasing customer benefits and satisfaction. The Okur family is committed to maintaining customer relationships by following new technologies with 50 years of experience and knowledge in the field. Every member of the Okur family adheres to the concept of customer orientation and works to find a solution to every problem, keeping pace with technological progress.

Okur’s strength comes mainly from the importance given to quality in both production and after-sales service and the search for new technologies. Success is not accidental. Okur Makina, realizing that the greatest strength is an educated workforce, improves its staff through constant training, thus taking its deserved place in the market. The company always provides its customers with quality products, good services and economic solutions, and thus becomes the legitimate pride of Turkey, taking its place in the national and international market as a strong corporate brand.

BITUMEN EMULSIONS

At some point, it is necessary to resort to different methods in order to increase the possibility of application due to the fact that the bitumen binder is not liquid, but ready to use in outdoor conditions. At high temperatures, fire risks and energy consumption increase. When testing with chemical solvents, there are increased risks of ignition and toxic factors.
Because of these obstacles, specialists have found a way to dilute the bitumen binder with water for a more environmentally friendly and lower-cost solution, and the resulting material is called a “bitumen emulsion.” In the production of bitumen emulsion, chemicals called emulsifiers are used. These emulsifiers, dissolving in water, acquire a “+” or “–” charge. Depending on these charges, they are called anionic or cationic emulsifiers.
Bitumen binders are divided into two groups depending on the emulsifiers used: anionic bitumen binders and cationic binders. They are also divided into three groups depending on the cutting method: fast cutting, medium speed cutting and slow cutting.
CHEMICAL COMPOSITION OF BITUMEN EMULSION

Bitumen Binder: 40-70%
Water (Softened): 30-50%
Chemicals (Emulsifiers): 0.2-2.5%
Solvent (Solvent): 0-30%
Additive (DOP): 0-4%
TYPES OF EMULSIFIER

Anionic emulsifiers (negatively charged) convert emulsions from sodium hydroxide, potassium hydroxide in alkali (pH ↑)
Cationic emulsifiers (positively charged) convert hydrochloric acid into phosphoric acid. (pH ↓)

WHERE ARE BITUMEN EMULSIONS USED?

Bitumen emulsions in our country are mainly used for surface coating, adhesive layer, putty, for patching, protective layer of ready-made bitumen emulsion mixture, for works to prevent moisture on bitumen bases. In addition, it is also used as a darkening layer at airports.

Surface treatment

According to the road specifications for surface coating, bitumen binders RS-1, CRS-1 or CRS-2 can be used, which comply with the TS 1082:2007 standards.

Binding bitumen layer

According to the road specifications, bitumen emulsions of the type SS-1, SS-1h, CSS-1, CSS-1h are suitable for use as a primer and bitumen emulsions RS-1, RS-2, CRS-1 and CRS-2 as an adhesive.

Protective layer application and thin-layer cold application

SS-1, SS-1h or CSS-1, CSS-1h emulsions, which are produced according to TSE standards, slow-cutting anionic and cationic types, can be used as a binder. Bitumen emulsion can be used to increase adhesion, extend the life of the binder, prevent softening and crushing under temperature changes and provide stability.

Cold application and patching

Quick-cutting cationic bitumen emulsions of the CRS-1 or CRS-2 type, which are modified according to TS EN 12591:2011, can be used as a bitumen emulsion. This bitumen emulsion has increased adhesion due to the modifying agent in the composition After the cutting procedure, there will be no tearing, no separation from the crack, etc. negative accidents, as it contains rubber-based additives in its structure and has high adhesion.

Darkening layer

A thin layer of bituminous material, called a “Fog-Seal” layer, is applied to improve the visibility of the object, reduced by the fading of the color of the runway with

EMTEC BITUMEN EMULSION PRODUCTION

Selected for quick and easy installation, this model guarantees compliance, especially with the coldest mortar coatings (Slurry Seal). The facility is designed as a container with two solution tanks due to the continuous production. In the production process, the pumps for liquid materials such as bitumen, mortar, solvent, DOP, latex, operate with the help of an inverter and have the ability to feed the process with materials in the required proportion. In addition, by placing a flow meter at the back of each pump, it is balanced with the data obtained from the flow meter with the amount that the system needs during pumping. The bitumen and solvent are passed through the static mixer in the proportions determined according to the recipe, thus ensuring that the bitumen is in the required penetration values. In addition, this static mixer is fed with a mixture in a certain proportion to increase the adhesiveness of the bitumen with the DOP material. The bitumen leaving the static mixer in stable form enters a colloid mill.

It contains in its structure two different devices for heating the water required for the solution. It is easy to provide heating of cold water coming from outside using an electric heater or a single-plate heat exchanger, which is placed at the outlet of the emulsion product. This modern practice saves heat energy and time. The solution, homogeneously mixed and the temperature and pH reach the appropriate value, with a vertical centrifugal pump made of stainless steel 316, passing through the flow meter, reaches a colloid mill. The bitumen and mortar reaching the mill are mixed, crushed at high speed and form an emulsion. The bitumen emulsion with an approximate temperature of 80-90˚C is passed through a single-plate heat exchanger and its temperature is reduced to approximately 60˚C.

Other products offered by Okur

Polymer-Cement Bitumen Plant
Hot Oil Boiler
Mechanical Stabilization Plant
Gravel Laying
Asphalt Spreader
Tow-type Asphalt Spreader
Combined Surface Coating Machine
Intermediate Tank
Sweeper
Roll Forming Machine
Joint Filling Machine
Water Tanker
Asphalt Patching Plant
Drum Heating System
Bitumen Storage Tanks