Plastics cover a broad field of organic synthetic resin and may be divided into two main classifications - aerospace thermoplastics _ and aerospace thermosetting plastics. Thermoplastics may be softened by heat and can be dissolved in various organic solvents.
Thermoplastics may be softened by heat and can be dissolved in various organic solvents. Two kinds of transparent thermoplastic materials are commonly employed in windows, canopies, etc. These are known as acrylic plastics and cellulose acetate plastics. Cellulose acetate was used in the past but since it is dimensionally unstable and turns yellow after it has been installed for a time, it has just about passed from the scene and is not considered an acceptable substitute for acrylic. Acrylic plastics are known by the trade names of Lucite or Plexiglas and by the British as Perspex and meet the military specifications of MIL-P-5425 for regular acrylic, MIL-P-8184 -~ 184 for craze-resistant acrylic.
Aerospace Thermosetting Plastics.
Thermosetting plastics do not soften appreciably under heat but may char and blister at temperatures of 240 to 260 'C (400 to 500 °F). Most of the moulded products of synthetic resin composition, such as phenolic, urea-formaldehyde, and melamine formaldehyde resins, belong to the thermosetting group. Once the plastic becomes hard, additional heat will not change it back into a liquid as it would with a thermoplastic.
Storage and handling.
Because transparent thermoplastic sheets soften and deform when they are heated, they must be where the temperature will never be excessive.
Transparent acrylic plastics get soft and pliable when they are heated to their forming temperatures and can be formed to almost any shape. When they cool, they retain the shape to which they were formed. Acrylic plastic may be cold-bent into a single curvature if the material is thin and the bending radius is at least 180 times the thickness of the sheet. Cold bending beyond these limits will impose so much stress on the surface of the plastic that tiny fissures or cracks, called crazing, will form.
Simple Curve Forming. Heat the plastic material to the recommended temperature, remove it from the heat source, and carefully drape it over the prepared form. Carefully press the hot plastic to the form and either hold or clamp the sheet in place until it cools. This process may take from ten minutes to one-half hour. Do not force-cool it.
This type of forming is normally used for such parts as canopies or complex wingtip light covers, and it requires a great deal of specialized equipment. There are four commonly used methods, each having its advantages and disadvantages.
Stretch forming. Preheated acrylic sheets are stretched mechanically over the form in much the same way as is done with the simple curved piece. Special care must be taken to preserve uniform thickness of the material, since some parts will have to stretch more than others.
Male And Female Die Forming. This requires expensive matching male and female dies. The heated plastic sheet is placed between the dies which are then mated. When the plastic cools, the dies are opened.
Aerospace Vacuum Forming Without Forms. Many aircraft canopies are formed by this method. In this process a clamp with an opening of the desired shape is placed over a vacuum box and the heated sheet of plastic is clamped in place. When the air in the box is evacuated, the outside air pressure will force the hot plastic through the opening and form the concave canopy. It is the surface tension of the plastic that shapes the canopy.
Aerospace Vacuum Forming With A Female Form. If the shape needed is other than that which would be formed by surface tension, a female mould, or form must be used. It is placed below the plastic sheet and the vacuum pump is connected. When air from the form is evacuated, the outside air pressure will force the hot plastic sheet into the mould and fill it.
Custom boxes are made from different materials. Each element determines the strength of the box and its use. Depending on the depth of one's pocket and the purpose of acquiring a certain container, one can specify what material they want their boxes to be made of. However, it would be wise to do a quick research before getting on the phone (or laptop) to order a custom container.
Custom Box Materials
Corrugated Plastic: Also known as Corriboard, corrugated plastic is a wide-range of plastic-plastic-sheet products made from high-impact polypropylene resin. Lightweight but tough, this material is mainly used for making signs and containers (read: boxes). Boxes made of corrugated plastic come in different sizes are reusable, and carry heavier weights than paperboard boxes. Corrugated plastic has many trade names, including Coroplast, Correct, and Twinplast, and it also comes in many colors.
Corrugated Fiberboard: This is the brown material most boxes are made of. Corrugated fiberboard is a type of paperboard that is made up of three layers: two flat pieces of paper with a fluted (corrugated) layer in the middle. This layering gives the material its strength, as well as the boxes.
Paperboard: Paperboard is a thick material made of, yes, paper. The main difference between cardboard and paper is that the former is thicker than the latter. Paperboard has several types, depending on their use and the industry using them, such as kraft board, laminated board, et cetera. A kind of paperboard is what is used to make corrugated fiberboard.
Cardboard: This refers to any heavy-duty paper. As such, most people use the terms cardboard, paperboard, and corrugated fiberboard interchangeably. Technically they are not the same thing. Cardboard is the parent name for all other 'boards.'
Wood: A hard material gotten from trees, wood is used to make crates and boxes and cases. It would be nice if one decided not to use wooden crates, as this would help the afforestation movement, and make steps towards reducing global warming.
Plastic: light, durable material produced by chemical processes, it can be formed into different shapes when heated. Mostly used in making crates, the plastic containers are divided into compartments that hold bottles for transportation and storage.
Metal: Metal containers are made of iron, tin, gold, or other alloys like brass. Boxes made of metal are durable, though susceptible to rust, and very expensive.
These are the different types of materials that are used to make custom containers. The strength, durability, and cost of a custom box depends on the material a customer chooses, and one's choice matters greatly if they are getting custom boxes for delivering goods to their clients.