Technology

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Why is the temperature raised in order to achieve crystallization in PET? Is that temperature higher ... Started by evelyn o bentley	3 Replies 112 Views	Aug 19, 2018 by kardosa007
What is the effect of crosslinks on an elastomer and what is the structural explanation for their ... Started by 09madisonrousseau09	1 Replies 306 Views	Aug 19, 2018 by jaaaaaaa
What are the differences between adiabatic heating and thermal heating as applied to extruders and ... Started by ap345	1 Replies 105 Views	Aug 19, 2018 by CourtneyCNorton
Discuss why the compression zone of a nylon-type screw is so much shorter than the compression zone ... Started by mpobi80	1 Replies 92 Views	Aug 19, 2018 by popopong
Why are injection molding machines not as effective for mixing additives or other resins as are ... Started by leilurhhh	3 Replies 82 Views	Aug 19, 2018 by quynhmickitran
Where is the normal separation point between the material that is removed with each cycle and the ... Started by Tirant22	1 Replies 52 Views	Aug 19, 2018 by Hikerman221
Why are ejector pins made of hard yet shock resistant materials? What will be an ideal ... Started by Arii_bell	1 Replies 51 Views	Aug 19, 2018 by mceravolo
List three advantages of the moveable system versus the rotary system for continuous extrusion blow ... Started by cnetterville	1 Replies 84 Views	Aug 19, 2018 by amit
Milk bottles are sometimes annealed after blow molding. Why is this done? What will be an ideal ... Started by cagreen833	3 Replies 64 Views	Aug 19, 2018 by joshraies
List three considerations that must be taken into account in the placement, number and size of the ... Started by SGallaher96	1 Replies 60 Views	Aug 19, 2018 by ghepp
A deep cup (20 cm deep x 10 cm diameter) is to be formed. Compare thermoforming, blow molding, and ... Started by Hungry!	1 Replies 130 Views	Aug 19, 2018 by Viet Thy
You are rotomolding a large children's toy with a very complicated shape and you have trouble ... Started by lak	1 Replies 69 Views	Aug 19, 2018 by bob
A resin supplier has suggested that a blow molder of polystyrene parts add 20 polyethylene to ... Started by bb	3 Replies 70 Views	Aug 19, 2018 by 1_Step_At_ATime
Identify three methods for controlling an exotherm in casting. What will be an ideal ... Started by wrbasek0	1 Replies 55 Views	Aug 19, 2018 by cloudre37
Describe how foamed plastic egg cartons are made. What will be an ideal ... Started by kshipps	1 Replies 52 Views	Aug 19, 2018 by Loise Hard
Describe poker chipping, and explain how it can be prevented. What will be an ideal ... Started by renzo156	1 Replies 295 Views	Aug 19, 2018 by elizabethrperez
What is meant by cryogenic flash removal? What will be an ideal ... Started by joe	3 Replies 66 Views	Aug 19, 2018 by essyface1
Why are sizes and coupling agents generally not generally used for aramid fibers? What will be an ... Started by karlynnae	1 Replies 55 Views	Aug 19, 2018 by durant1234
Would HDPE, LDPE, or LLDPE be the most strongly affected (crosslinked) by electron beam radiation? ... Started by tth	1 Replies 70 Views	Aug 19, 2018 by Joy Chen
Why not eliminate the cull and save this extra material when doing transfer molding? What will be ... Started by CORALGRILL2014	1 Replies 66 Views	Aug 19, 2018 by Li Jun
Discuss the value of a primer coat when painting a plastic part. What will be an ideal ... Started by penguins	3 Replies 104 Views	Aug 19, 2018 by 1_Step_At_ATime
What advantage does a two-part adhesive system have over a one-part system? What will be an ideal ... Started by jho37	1 Replies 79 Views	Aug 19, 2018 by whitcassie
Why is it advisable to have only one or two suppliers? What will be an ideal ... Started by jwb375	1 Replies 49 Views	Aug 19, 2018 by EAN94
What are two major disadvantages to degradable plastics? What will be an ideal ... Started by brutforce	1 Replies 62 Views	Aug 19, 2018 by k.lashomb
You are given samples of PVC, exposed to warm cooking oil (90 F) and acetone. Based on polymer ... Started by dbose	3 Replies 58 Views	Aug 19, 2018 by tanna.moeller