Moulding Flashcards
(17 cards)
What is molding?
A manufacturing process used to shape materials into specific forms
Molding can involve various methods such as injection molding, blow molding, and vacuum forming.
What is blow molding?
A process that produces hollow products from thermoplastics
Commonly used for making items like PET bottles.
What is injection molding?
A process where material is forced through a die to create products
It is distinct from other methods as it involves high pressure.
What is a hopper in the context of molding?
A container that holds granules of material before processing
Granules are fed into the hopper for molding processes.
How does the Archimedean spiral function in molding?
It moves granules through heat for processing
This mechanism helps in achieving uniform melting of materials.
What is a parison in blow molding?
An extruded hollow tube that is inflated to form products
Air is pumped into the parison to shape the final product.
What types of shapes can be produced through molding?
Complex 3D shapes
Molding allows for intricate designs that may not be achievable through other methods.
What is the significance of temperature in molding?
Heat is applied to melt materials for shaping
Different processes require different temperature controls.
What is vacuum forming?
A process where plastic is shaped by heat and force
Involves removing air to create a tight fit against the mold.
What is a draft angle in molding?
An angle designed into a mold to facilitate the removal of the product
It helps in preventing damage to the product during ejection.
What is the role of air holes in molding?
To allow air to escape during the molding process
Prevents defects in the final product.
What is rotational molding used for?
To produce hollow products with large wall thickness
Involves spinning a mold to evenly distribute the material.
What is the first step in rotational molding?
Powder is placed into the mold
This initial step is crucial for the subsequent heating and spinning process.
What is the final step in the rotational molding process?
Cooling the product to solidify it
The cooling phase ensures the final product maintains its shape.
What is a batch production in molding?
A method that produces a limited number of products at a time
It allows for easy customization of molds.
True or False: Thermosetting plastics can be re-melted and reshaped.
False
Thermosetting plastics harden permanently after heating.
What type of gutters can be produced through injection molding?
UPVC gutters
These are continuous and made from thermoplastics.
