From Tree to Paper: The Journey of Cellulose
What is Cellulose?
Cellulose is the main component of cell walls in trees and other plants. This vegetable fiber, when observed under a microscope, resembles a human hair in structure. Its length and thickness vary depending on the type of tree or plant. For example, cotton fibers measure 20-25 mm, pine fibers 2-3 mm, and eucalyptus fibers 0.6-0.8 mm. Similarly, the cellulose content varies across different tree and plant species.
Currently, pulp mills in Chile extract fiber from pine and eucalyptus
Read MoreElectrical Installations in Diverse Environments: A Comprehensive Guide
1. Electrical Installations in Moist Environments
Moist or wet sites are characterized by brief or prolonged condensation, salt or rust stains, or water impregnation on ceilings and walls.
1.1. Busbar
Pipes, terminals, splices, and connections must be sealed to achieve an IPX1 rating (protection against vertically falling water droplets). This applies to busbar trunking as well.
1.2. Switchgear
Junction boxes, switches, sockets, and all switchgear must have an IPX1 rating. Covers and accessible parts
Read MorePrefabrication and Modular Coordination in Construction
Item 1: Rationalization, Industrialization, and Prefabrication
1.1 Rationalization
The set of studies on technology, management, and production methods made for improvements in productivity and profitability.
1.1 Industrialization
It is the process of mass production, machining and production scheduling, studying the market and design. Everything is automated.
- The item is performed at the factory and outside a specific project.
- Using the element does not require complex manipulation or alteration of features.
Construction Materials: A Comprehensive Guide to Stone, Ceramic & More
Construction Materials
1. Choosing Construction Materials
When selecting construction materials, consider the following:
- Climate of the building location
- Load-bearing capacity of each structural element
- Cost of the material
- Aesthetic considerations
2. Groups of Construction Materials
Common construction materials include:
- Stone
- Cement
- Mortar
- Concrete
- Plaster
- Ceramic
- Wood
- Metals
Stones
3. Common Stone Types in Galicia
Granite and slate are widely used in Galicia due to their abundance in local quarries.
4. Common Stone
Read MoreGuide to Parallel Welding Machines & Underwater Cutting/Welding
How to Put Two Welding Machines in Parallel
When using two welding machines in parallel, a parallel switch with a minimum capacity of 300 amperes is required. This necessitates the use of a double-pole safety switch. Adjusting two variable power machines for parallel operation involves two phases:
Phase 1: Current Adjustment
Each machine should be configured to deliver the same current when operating in parallel, with each machine providing half of the total current.
Phase 2: Voltage Adjustment
The open
Read MoreConstruction Materials: A Comprehensive Guide for Beginners
Construction Materials
1. – What must we take into account to choose a construction material?
To choose a construction material, we must pay attention to:
– The weather of the place where the building is going to be set.
– The effort that each element of the structure has to support.
– The cost of the material.
– Esthetical condition.
2. – Which groups of construction materials do you know?
Stone, cement, mortar, concrete, plaster. Ceramic,
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