Views: 227 Author: WENVA machine Publish Time: 2025-11-10 Origin: Site
Content Menu
● The Formation Principle of Hard Biscuit Dough
>> The Role of Flour Proteins and Gluten Structure
● Key Roles of Ingredients in the Production Process
● Functional Additives and Dough Improvement
>> Leavening Agents and Emulsifiers
● Main Stages in Hard Biscuit Production
>> 1. Mixing and Dough Preparation
● Functional Ingredients and Innovation Trends
>> Incorporating Functional Raw Materials
>> Automation and Quality Control
● Frequently Asked Questions (FAQ)
Hard biscuits, also known as semi-sweet or hard dough biscuits, are made mainly from cereal flours through processes such as mixing, sheeting, forming, and baking. They are characterized by a clean surface, distinct patterns, layered texture, and crispy bite.
Compared to short-dough biscuits, hard biscuits contain less fat, have a lighter density, and depend more on gluten formation and dough extensibility.
This article explains the production principle of hard biscuits and highlights the key technologies applied in a modern hard biscuit production line.
When flour proteins are hydrated under controlled conditions in a biscuit mixing machine, they form gluten networks that give the dough extensibility and moderate elasticity.
The quality and amount of gluten directly affect dough structure, gas retention, and final product quality.
During industrial production, consistent gluten development is achieved by precisely controlling mixing time, temperature, and hydration, ensuring a uniform and stable dough sheet for subsequent processes.

Sugar provides sweetness and participates in the Maillard reaction and caramelization during baking, influencing both color and flavor.
However, excessive sugar can darken the biscuit surface and increase hardness. Automated ingredient dosing systems maintain accurate sugar levels, ensuring consistent taste and appearance.
Fats contribute to biscuit texture by controlling water migration and limiting excessive gluten formation.
An optimal fat level creates a light, crisp structure and improves the biscuit's mouthfeel. In industrial mixing systems, controlled fat distribution ensures product uniformity and prevents oxidation.
Leavening agents such as sodium bicarbonate and ammonium bicarbonate release gases during baking, expanding the biscuit and creating a porous structure.
Emulsifiers like lecithin improve dough plasticity, enhance sheet smoothness, and contribute to a uniform texture.
Enzymes such as protease and xylanase are increasingly used as natural alternatives to chemical dough improvers.
These enzymes enhance dough rheology, increase extensibility, and improve baking performance — aligning with the industry's move toward clean-label production.
The process begins with a high-efficiency dough mixer, where flour, water, and other ingredients are blended into a uniform dough.
Proper control of hydration, temperature, and mixing time ensures the formation of a stable gluten network with good elasticity and plasticity.
The dough is passed through a series of dough rollers to form thin, even sheets. The sheeting sequence determines biscuit layering and final texture.
The sheets then enter the biscuit forming machine (rotary cutter), where they are shaped, embossed with patterns, and perforated to prevent uneven puffing during baking.
A modular forming system allows easy adjustment of roller gaps, line speed, and cutting molds to suit different hard biscuit recipes.
The shaped dough pieces are baked in a biscuit tunnel oven equipped with precise temperature control across multiple zones.
Even heat distribution ensures consistent color, proper expansion, and ideal moisture content.
After baking, the biscuits pass through a cooling conveyor to stabilize texture and prepare for packaging.
To meet consumer demand for healthier snacks, many manufacturers now incorporate ingredients such as yam powder, potato flour, oat flour, or mushroom powder into hard biscuit formulations.
These ingredients provide unique flavors and nutritional value but may weaken the gluten network. Therefore, recipe adjustments and process optimization are essential to maintain dough elasticity and structural integrity.
Modern biscuit production lines employ intelligent PLC systems for digital monitoring and process automation.
Parameters such as sheeting thickness, oven temperature, and line speed are precisely controlled to ensure consistent product quality and reduce human error.
Q1: What makes hard biscuit production different from short-dough biscuit production?
A1: Hard biscuits require strong gluten formation and multiple sheeting stages, while short-dough biscuits focus on high-fat formulations and minimal gluten development. Each type uses different mixers, rollers, and forming machines.
Q2: What are the key control parameters in hard biscuit manufacturing?
A2: Important parameters include dough hydration, mixing time, sheeting pressure, and baking temperature curves — all of which directly affect crispness, layering, and product uniformity.
Q3: Can one production line produce different types of biscuits?
A3: Yes. By adjusting process settings and forming molds, a single hard biscuit production line can be adapted to produce a variety of products, such as soda, digestive, or semi-sweet biscuits.
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