disadvantage of using plastic as pattern materials

Plastics gain importance as patternmaking…

There are some disadvantages to using plastics for patterns. They generally include a surface hardness that is considerably less than metal and, thus, more.

Plastic Vs. Metal Fabrication - Advantages and…

This article offers a comparison between plastic and metal fabrication, . drilling and honing, use automated or manually controlled equipped to shape material.

What are the disadvantages of plastic? |…

Plastic has many disadvantages, including environmental, choking and chemical . it is made with recycled materials, including plastic milk jugs and shopping .

What are the advantages and disadvantages of using…

The advantages of using plastics are that they are lightweight, water resistant, . in any climate and for storing chemicals such as ammonia and caustic materials.

What are the advantages and disadvantages of…

The main advantages of plastic materials are also the reason why plastic is such . toxicologists recommending not re-using plastic water bottles and not storing.

Advantages & Disadvantages to Extrusion…

Find out about the advantages and disadvantages to extrusion blow molding plastic. . hollow 3D articles are produced using various kinds of thermoplastic materials. . by backpressure, land length, melt compression and melt flow pattern.

Pattern (casting) - Wikipedia

Typically, materials used for pattern making are wood, metal or plastics. . The downside is that it wears out fast, and is prone to moisture . Plaster of paris is usually used in making master dies and molds, as it gains hardness quickly, with a lot of flexibility when in the setting stage.

Investment casting - Wikipedia

Investment casting is an industrial process based on lost-wax casting, one of the oldest known . Investment casting is valued for its ability to produce components with . Produce wax patterns: Although called wax patterns, pattern materials may also .. The main disadvantage is the overall cost, especially for short-run.

Wood as a Building Material; It's Benefits and…

With other materials, it is almost impossible. . electricity that is dangerous for human health is not observed in wood unlike metal, plastic and other materials.

1.3 Advantages and Disadvantages of Composites -… ae.metu.edu.tr/./Advantages%20.n%20Systems.Reinforced concrete is a g~od example of a composite material. . Laminate patterns and ply buildup in a part can be tailored to give the required . plastics (GRP). . double-curvature parts with a smooth surface finish can be made in one.

Pattern - nptel

It is the replica of the object to be made by the casting process, with some modifications. . The usual pattern materials are wood, metal, and plastics. . The main disadvantage of wood is its absorption of moisture, which can cause distortion.

Engineering Materials

Engineering materials are metals and plastics. Wood is used to make patterns and models. . Engineering nylon grades are easy to machine with good resistance to biological attack. Unfortunately nylons can . Disadvantages - Very brittle

BBC - GCSE Bitesize: Batch production tools

For example, when drilling through a block of wood with two holes in, it will make . you can draw around to mark a shape onto material, so that it can be cut or shaped. A pattern is used to make a mould when casting in metal or plastic resin.

BBC - GCSE Bitesize: Packaging materials

Packaging materials. Plastics. Plastics are widely used in food packaging because they are: versatile - plastics can be flexible or rigid, . Advantages, disadvantages and uses of different types of materials. . may react with food. - soup cans.

What is The Best Cell Phone Case Material? -…

18 Nov 2015 . There are a variety of materials used for cell phone cases, each with its . The most popular materials are: metal, wood, plastic, leather and . from the plastic can have many customized designs and patterns. . Disadvantages.

The Advantages & Disadvantages of…

There are advantages and disadvantages to using plastic in your home. . Plastic is cheaper than other common storage materials, such as glass, metal and.

The Benefits of Using Wood - Make it Wood

Responsibly sourced wood is the only renewable building material available; it is . often be used in place of materials like steel, aluminium, concrete or plastics.

3 foundry - SlideShare

1 Oct 2013 . Plastic: Plastic as a pattern material has following advantages: 1) It is .. When making a mould using this pattern, a vertical spindle is firmly.

Laminated plastics - SlideShare

11 Oct 2015 . BUILDING MATERIAL SONALI PARASHAR PLASTIC LAMINATE WHAT IS . This sheet ADVANTAGES OF USING PLASTIC LAMINATE The .. that will show through the clear top layer for the desired surface pattern.

Design and Make Assignment: a snack tray

The tray must be made from a sustainable plastic material that can be washed . you should describe the advantages and disadvantages of using plastics made . a pattern; patterns for vacuum forming may be made from resistant materials.