Catic Igor

University of Zagreb · Department of Mechanical Engineering and Naval Architecture (FSB)

Croatian Names of New Diseases The strong development of natural sciences and technology, in particular after the intro�duction of e-communication, email and the Internet, has imposed the need to introduce new words into the professional language. This is especially important for the widest community. Croatian is a very fruitful and precise langu...

Since the middle of the 20th century, the world's population has been growing exponentially. This has required finding new procedures, methods, and materials to meet the necessary and desirable products of a growing population. The result is an increasing amount of waste, because of material or informational human activities. Its management has bec...

Od sredine 20. stoljeća broj stanovnika u svijetu eksponencijalno raste. To zahtijeva pronalaženje novih postupaka, metoda i materijala pri zadovoljavanju potrebnih i poželjnih proizvoda sve brojnijeg stanovništva. Rezultat je i sve brojniji otpad kao posljedica materijalne ili informacijske ljudske djelatnosti. Gospodarenje njime postao je globala...

Since the middle of the 20th century, the world's population has been growing exponentially. This has required finding new procedures, methods, and materials to meet the necessary and desirable products of a growing population. The result is an increasing amount of waste, because of material or informational human activities. Its management has bec...

The correlation between ceramics, plastics, and rubber on examples of works of art.

Ključne riječi informacija, energija, materija, sustavnosna teorija, vrste sustava, podrijetlo izvora, suvre­ meno obrazovanje 1. Uvod Preobilje najraznolikijih dostupnih informacija, razna rješenja u proizvodnji energije i otkriće sve raznovrsnijih oblika materije na subatomskoj te višim razinama vodi rascjepkavanju znanja. 1 To se posebno odražav...

The abundance of easily accessible information disenables systematization into meaningful wholes. It is becoming one of the major issues of the general education system. One of the solutions for educating new generations is the synthesiological approach. It requires a selection of available information and allows the creation of new, general knowle...

All created in the Nature is the result of natural technology. Solutions from Nature can be incentive for artificial, man's technology of living (biotechnology) and technology of abiogenesis. We have set ourselves the question what is a natural additive model for making parts. After geological analysis and playback of some products of Nature and ma...

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Data on the production of plastics in the world of the 1950th to 2014th was considered the application of plastics from cradle to grave

For a very long time materials have traditionally been classified in two main groups: metals and non-metals. Now we need a new paradigm in substances and materials (macromolecular compounds) and product classification. One demand for this new paradigm is based on the definition of polymers and their quantity. The second reason is the increased avai...

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In the past half century, the number of procedures that are basic models of metal die casting and injection molding of thermoplastics raised to more than 260. This requires a generalization and development of a general model that would cover all existing versions of these operations. On the basis of research it was found that the die casting and in...

The word polymers is usually related to plastics and rubber. This definition narrows down the meaning of the word to a very significant group of materials, but leaves out numerous other substances and materials that are also polymers. The consequence is the difficulty in observing the interconnection or comparability of polymers among each other or...

Based on research on influence of rubber and plastics on globalization, an interesting question arose: can we define the first globalization way of material culture? Manufacturing of first stone tools can be seen at the site of Gona, Ethiopia (dated to 2,6 million years ago), followed by several sites including the evidence from West Turkana in Ken...

The descriptions of the development of events in nature from the moment of the Big Bang are using concepts of 'energy' and 'matter'. Systemically, these descriptions lack the third component of every system - information. This brings up the question of where in these descriptions information is and does it possibly precede energy. The analysis used...

The research about the impact of rubber and plastics on globalisation has led to the idea of discovering the first material globalisation road. It started in Gona, Ethiopia, ∼ 2.6 million years ago by the making of the first stone choppers and flakes. Three characteristic places were found where these cutters were made within a time span of a milli...

Based on the philosophic ideas of O. Spengler and Aristotle it has been determined that polymers are ancient since they reach back all the way to the origin of the basic natural organic and inorganic polymers. At the same time it has been noted that the word polymers is frequently used as a common name for plastics and elastomers. Since the basic n...

Na temelju istraživanja o utjecaju gume i plastike na globalizaciju došlo se na zamisao da se otkrije prvi materijalni globalizacijski put. On počinje u Goni, u Etiopiji, prije oko 2,6 milijuna godina izradbom prvih kamenih rezala (sjekača i odbojaka). Utvrđena su tri karakteristična mjesta izradbe tih rezala u rasponu od milijun godina. To širenje...

Polazeći od fi lozofskih misli O. Spenglera i Aristotela, utvrđeno je da su polimeri prastari, jer sežu tamo do postanka osnovnih prirodnih organskih i anorganskih polimera. Istodobno je uočeno da se riječ polimeri učestalo upotrebljava kao zajedničko ime za plastiku i elastomere. Od osnovnih prirodnih organskih polimera: bjelančevina, nukleinskih...

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The catalyst for this paper on biofuels and bioplastics was a newspaper report which appeared in January 2007. The report stated that maize prices on the Chicago Stock Exchange had hit an all-time high, while stocks were at their lowest level for ten years. The price rises and dwindling stocks were explained by the decision by President George W. B...

Po svom obujmu šupljikave tvorevine čine najrasprostranjeniju skupinu polimernih tvorevina jer njihova gustoća može biti od 1,2 do 20 % kompaktnoga proizvoda. Tijekom sistematizacije postupaka proizvodnje ili izradbe pjenastih proizvoda u sklopu tehnologijskog projekta Injekcijsko prešanje polimera i ostalih materijala pokazalose nužnim proizvode s...

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SummaryThe spark for this paper about biofuel and bioplastics was stimulated by a newspaper article fromJanuary 2007. The news said: prices of corn on the Chicago stock exchange have reached theirrecord level, and the corn stocks fell to their lowest level in the last ten years. The reason for thegrowing prices of corn and the falling stocks was th...

Regarding their volume the products with hollows form the most widespread group of polymer parts since their density can be 1.2 to 20% of compact product. During the systematization of production processes or the production of foamed parts as part of the technological project of Injection moulding of polymers and other materials, ' it proved necess...

To pose a question about future development of e.g. welding means to answer the question of future development of Materials technology. The syntagm Materials technology is a common nominator for Material technology and Production technology. Material technology means the production and application of materials based on discoveries of natural scienc...

Danas se načela grupne tehnologije koriste u mnogim granama proizvodnje. Međutim, ona tek trebaju naći svoju primjenu kod injekcijskog prešanja. Postoji velik potencijal za sniženje troškova tijekom razvoja proizvoda primjenom grupne tehnologije. Također, standardiziranjem sklopa žig - gnijezdo za određenu obitelj proizvoda postižu se uštede u proi...

Today, group technology principles are used in many areas of manufacturing. However they are yet to find their usage in the injection moulding industry. There is great potential for cost-saving in product development process by using group technology. Also, standardizing the cavity - core set for part families gains the savings in mould production...

Načinjen je i opisan opći model injekcijskoga prešanja metalnih čestica s pomoću Ropohlovih teorijskih definicija. Modelom su opisane temeljne funkcije procesa, uključivo ulaze, izlaze i veze među funkcijama (sastavnice sustava). Temeljna načela procesa i svi fenomeni povezani s MIM-om predstavljeni su s pomoću ulaza, izlaza i relacija. Svrha je pr...

The study reported in this paper comprises the making and description of the general model for metal injection moulding (MIM) and the analysis of the mentioned process with Rophol's theoretical definitions. The model includes a complex of elements of the metal injection process. The elements are the core of the model and the inputs, outputs and rel...

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Just review of this book. Sincerely yours Igor Catic

The laws for optimal heat exchange in molds for injection molding of thermoplastic melts have been known for a relatively long time, more than 30 years. But from time to time we can read and hear that someone has achieved shortening of the cycle time and hence the cooling time of molding also by two-digit percentages. Based on the general equation...

Heat exchange in molds is very important parameter in optimizing the injection molding process. The research of this matter in the field of injection molding of thermoplastics melts are know and very extended described. This is not the case with the reactive injection molding of thermosets and rubber. Investigation had been made in industrial shops...

The paper stresses the importance of cavity temperature in the injection molding process of thermoplastics. From the study of the temperature field in the mold, it follows that there is no such thing as a uniform mold temperature. The heat balance equation for the injection mold is discussed in detail. It shows that the sum of the heat exchanges du...

Tooling has lived through substantial changes. The toolmaker has been, first of all, the designer and maker in one and the same person. Then, in the second part of the 20 th century the division took place in the form of the increased specialization. Three function specialists: the mold designer, function makers of mold elements, and the assembling...

Temeljeno na fraktalnoj raščlambi prošlosti i budućnosti opće tehnike,moguće je predvidjeti daljnji razvoj materijalstva (materijalike iproizvodne tehnike). U budućnosti je moguć revolucionarni razvojmaterijala na subatomskoj razini n-1. Naprotiv, jednom razvijeneproizvodne postupke i proizvode moguće je samo usavršavati. / Based on fractal analysi...

Mould design for injection moulding of thermoplastic melts is becoming an increasingly complicated task, so that even experienced mould designers could have problems. One of the most important phases of mould design is the conceptual mould design, and the mould designer must pay special attention to this phase. The approach to the conceptual mould...