Temperature of the molten plastic is an important factor to be controlled in injection moulding. The design of cooling system operating temperature of the injection moulding is affected by the following factors. Type of polymer used. Length of flow within the impression. Wall section of moulding length of the feed system. Number of impressions in
Design of Cooling System – Integer Type Read More »
Extruder is one of the most common processes used to create plastic components for further processing. Extruder machine is also similar to that of injection moulding machine. The process consists of feeding the powdered plastic from the hopper into the heated chamber. A rotating screw carries the material forward and forces it out through the heated
Extruder Screw Type Machine – Pedagogy Zone Read More »
Blow moulds are relatively simple in design and construction when the predominant blow moulded products are bottle and container. The blow moulding process are made of aluminum or other lightweight metal. It can be either machined or cast. Requires a high degree of cooling throughout the mould. It requires several vents at parting line and
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A standard mould for injection moulding is divided in two sides: cavity side and core side. A cavity side consists of sprue and runner system through which the plastic melted from nozzle enters into the mould. A core side consists of core, de moulding system and ejection system. Since this type of mould have one
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We have discussed so far various features of C language and are ready to write and execute programs of modest complexity. However, before attempting to develop complex programs, it is worthwhile to consider some programming techniques that would help design efficient and error free programs. The program development process includes three important stages, namely, program
Program Design in C Language – Developing a C Program Read More »
Application of linked list concepts are useful to model many different abstract data types such as queues, stacks and trees. If we restrict the process of insertion to one end of the list and deletions to the other end, then we have a model of a queue. That is, we can insert an item at
Application of Linked List Dynamic Memory Allocation Read More »
It is likely that we discover later, the previously allocated memory is not sufficient and we need additional space for more elements. It is also possible that the memory allocated is much larger than necessary and we want to reduce it. In both the cases, we can change the memory size already allocated with the
Realloc in C – Altering the Size of a Block Read More »
calloc in c is another memory allocation function that is normally used for requesting memory space at run time for storing derived data types such as arrays and structures. While malloc allocates a single block of storage space, calloc in c allocates multiple blocks of storage, each of the same size, and then sets all
Calloc in C – Allocating Multiple Blocks of Memory Read More »
A block of memory may be allocated using the function malloc in c. The malloc function reserves a block of memory of specified size and returns a pointer of type void. This means that we can assign it to any type of pointer. It takes the following form: ptr = (cast-type *) malloc(byte-size); ptr is
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Most often we face situations in programming where the data is dynamic in nature. That is, the number of data items keep changing during execution of the program. For example, consider a program for processing the list of customers of a corporation. The list grows when names are added and shrinks when names are deleted.
Dynamic Memory Allocation in C Language – Memory Allocation Process Read More »