Dong-Yih Machinery Co., Ltd.

Food Machinery Knowledge

Dough Temperature and Resting Time

Dough that is too warm becomes sticky and ferments too fast, while dough that is too cold is firm with poor extensibility. Resting relaxes the gluten so the dough does not shrink back on the machine. Adjust dough temperature with water temperature in summer and winter, and measure and record it consistently for stable products.

What to Watch When Running Fermented Dough on a Machine

The biggest worry with fermented dough on a machine is that it keeps growing while on the machine. Wrapping first and fermenting afterward is common in bun factories; overfermented dough is gassy and weak and tends to tear and slump; frozen dough should be thawed in the refrigerator first and brought to a uniform temperature inside and out before going on the machine.

Filling Viscosity, Particle Size, and Water Content

Filling that is too runny leaks and meters inaccurately, particles that are too large jam the feed and puncture the wrapper, and water release soaks the wrapper so the seal will not hold. Filling for machine production should hold together, have small and uniform particles and stable water content, and be chilled before going on the machine.

Filling Temperature: Why Fillings Are Often Chilled Before Going on the Machine

Chilled filling is firmer, does not release water or oil, meters accurately, seals well, and is more hygienic. Meat filling should be chilled before going on the machine; high-fat fillings soften and get slippery as soon as they warm up, so find the temperature at which they are easiest to work with and control it.

Vegetable Filling (Cabbage, Chinese Chives, Napa Cabbage): Dewatering and Water Release

Cabbage and napa cabbage hold a lot of water and keep releasing it once chopped and salted, making the filling runny, soaking the wrapper, and keeping the seal from holding. Before machine production, dewater them first, lock in the water with oil, the stickiness of meat filling, or absorbent ingredients such as starch and breadcrumbs, and chill before going on the machine.

Meat Filling (Adding Water, Mixing, Stickiness)

Mixing meat filling with salt releases salt-soluble proteins and creates stickiness, which holds water and makes the filling cohesive and easy to run on a machine. Too much added water makes it runny, so it releases water and leaks; frozen meat should be thawed slowly in the refrigerator, ice should be added during mixing to control temperature, and the mixed filling should be chilled before going on the machine.

Hardness and Oil Content of Sweet Fillings (Red Bean, Mung Bean, Taro Paste, Lotus Seed Paste)

Sweet fillings for machine production should be firm, not sticky to the touch, and not oily. Bean paste that is too soft leaks and weighs inaccurately, so it can be cooked down further or chilled; too much oil makes it slippery and keeps seals from sticking. Commercial fillings have consistent specifications, while homemade fillings taste better but batch variation must be controlled.

Characteristics of Glutinous Rice Dough (Tangyuan, Mochi) on Machines

Glutinous rice starch is almost entirely amylopectin, which becomes especially sticky once gelatinized, so on a machine it tends to stick to the hopper and conveyor and leave tails when cut. It can be improved with cooked flour for anti-sticking, adjusting the ratio of raw to cooked dough, and temperature control, while keeping the surface from drying out and hardening.

Sweet Potato and Taro Ball Dough: Recipes and Machine Running

Sweet potato ball and taro ball dough is made by kneading steamed sweet potato or taro mash with tapioca or other starches. Too much mash and too little starch makes it sticky and saggy; too much starch and too little mash makes it dry and prone to breaking. Fix your raw material condition first, then add water or mash if too dry, or starch if too wet, a little at a time.

Using Dough Improvers, Emulsifiers, and Additives

Dough improvers and emulsifiers can make dough more stable and easier to run on machines, but they cannot replace a correct recipe and proper temperature control. Additives must comply with Taiwan's Standards for Specification, Scope, Application and Limitation of Food Additives, and packaging must list additive names as required by the Act Governing Food Safety and Sanitation.

Do Machine-Made Products Need a Recipe Change?

Your handmade recipe is a good starting point, but machine production usually calls for fine-tuning water content, gluten strength, resting, and filling moisture and particle size. The producer leads recipe adjustments, the machine side provides parameter settings, and a trial run with your own ingredients gives the most accurate answer.

Quality After Freezing: What to Do About Cracked, Dried-Out Wrappers

Frozen dumpling wrappers commonly crack because freezing is too slow and forms large ice crystals, the surface loses moisture, the filling releases water, and the freezer temperature fluctuates. Quick freezing passes rapidly through the zone of maximum ice crystal formation, and the recipe can be adjusted for water retention and gluten strength.

Cart