Dong-Yih Machinery Co., Ltd.

Company Profile

Dong-Yih Machinery Co., Ltd. was founded in 1989 as a machinery repair shop and OEM assembly plant. In 1991 we set up a machinery R&D department to build special-purpose food machines to customer requirements. In 2001 the business was reorganized as Dong-Yih Machinery Co., Ltd., specializing in automatic encrusting and forming machines for all kinds of food. Our products: microcomputer-controlled fully automatic portioning machines, machines for baozi (steamed buns), mantou, and silver thread rolls, automatic encrusting and forming machines, flatbread presses, dough shaping and dividing machines, and more. Dong-Yih Machinery specializes in automated food machinery, supplying equipment that delivers high efficiency, high output, and easy maintenance, including automatic bun and mantou machines and microcomputer-controlled fully automatic portioning machines.

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Food Machinery Knowledge

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What Is an Encrusting Machine? Structure, Uses, and How It Differs from a Forming Machine

An encrusting machine feeds the outer dough and the filling into the machine at the same time, extrudes them through a concentric nozzle, and cuts and seals them with a shutter. It can make everything from red bean buns, mooncakes, and mochi to croquettes and tangyuan, and it plays a different role from a forming machine, which only shapes the product.

The Co-Extrusion Principle: How Dough Wraps Filling in a Continuous Flow

An encrusting machine meters the dough and the filling separately, brings them together in a concentric double-layer nozzle, and extrudes a continuous rope with filling in the center and dough around the outside, which a shutter then cuts. Feeding them separately is what makes the ratio adjustable and the weight consistent.

Feeding Mechanisms: Screws, Vane Pumps, and Roller Feeding Compared

An encrusting machine pushes the dough and filling into the nozzle, most commonly with twin screws plus a vane pump for metering, though roller feeding and cycloid flow regulators are also used. Different feeding methods suit materials of different hardness and elasticity, and the quality of the design directly affects gluten and weight.

Cutting and Sealing: How a Shutter Turns a Filled Rope into Individual Pieces

After the filled rope is extruded from the nozzle, a shutter made of several blades arranged in a ring closes like a camera iris, pinching off the rope and gathering the dough to cover the cut. The conveyor below moves up and down in sync to support the bottom, so the product comes out round without leaking filling.

How to Adjust the Ratio of Dough to Filling (Encrusting Ratio)

The dough-to-filling ratio on an encrusting machine is adjusted through the speed ratio of the two feed systems for dough and filling. RHEON's KASEIJIN series lists a ratio from 1:0 to 0:1, but extremely thin dough and very high filling content are still limited by the dough's extensibility, the firmness of the filling, and sealing conditions.

Weight Control: How Does an Encrusting Machine Keep Every Piece the Same Weight?

Whether each piece from an encrusting machine weighs the same depends on whether the feeding mechanism fills completely every time, whether the ingredients are uniform, and whether the control system can compensate. Microcomputer control turns speed and timing into stored numbers, making it easier to reproduce the same conditions than with mechanical adjustment.

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No.140, Aly.116, Ln.572, Sec.1, Qingsha St., Annan Dist., Tainan City 709, Taiwan (R.O.C.) View on map

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