Question

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7 Hot-Runner Injection Molds
Hot-runner injection molds are gaining increasingly more importance because of their profitability, as they allow fast automatic cycling. The advantage lies in the feature that sprues and runners are eliminated and the plasticizing and injection capacity of the injection-molding machine can be fully utilized.
The liquid melt is conveyed from the sprue bushing to the cavities via runners. The melt has to be kept warm all the time so that it remains liquid and is available for the next injection sequence as soon as one is finished. The volume of the runners must be matched to the shot volume and the cycle time to avoid an excessive dwell time in the hot-runner channels.
Heating is usually by heater cartridges, which are rigid, or by heating tubes, which are flexible. The heating cartridges can have a watt density of up to 60 watt/cm2. Due to their excellent heat transference they can be fitted into hot-runner blocks in bores of tight tolerance. The distance between hot runner and heater cartridge should be at least 10 mm to avoid overheating of the plasticized material.
Figure 29 shows the layout of a hot-runner mold with heated runners. The manifold block (a) houses the heater cartridge (b), the distribution nozzle (c), the thermocouple (d), the sprue bushing (e) and the runners (f). The external shape and size of the manifold block — whether round, square or star shaped — depends entirely on the position and number of injection points. The individual heater cartridges (b) are connected to a junction box and divided into several heating circuits on larger tools. The energy requirement must be adequate to keep the melt in the runners If) and in the plasticized sprue bushing up to the tip at the molding cavity. The plugs (g) in the ends of the runners are profiled to facilitate material flow, as the material is diverted by them. This is important because “dead spots,” which could house burned material, must be avoided.
The heat-conductive core (h) built into the manifold nozzle (c) has been manufactured from good heat-conducting material, e.g., beryllium-copper. It forms a hollow space (i) with the surrounding nozzle, which is filled by plastic melt forming a heat-insulating layer.

Answer 1

7 个热赛跑者射入模子 热赛跑者射入模子获取越来越更多重要性由于他们的有利, 因为他们允许快速自动循环。好处在在sprues 和赛跑者被消灭并且射入造型机器成为可塑和射入容量可能充分地被运用的特点。 液体融解被表达从sprue 丛生对洞通过赛跑者。融解必须一直被保持温暖以便这保留液体和是可利用的为下个射入序列当你被完成。赛跑者的容量必须被匹配对射击容量和周期避免过份停留时间在热赛跑者渠道。 热化通常是由加热器弹药筒, 刚性, 或由加热管,是灵活的。热化弹药筒可能有瓦特密度60 watt/cm2 。由于它们的优秀热传递它们可能适合入热赛跑者块在紧的容忍打扰。距离在热的赛跑者和加热器弹药筒之间应该是至少10 毫米避免过度加热plasticized 材料。 图29 显示一个热赛跑者模子的布局与激昂的赛跑者。繁多块(a) 安置加热器弹药筒(b), 发行喷管(c), 热电偶(d), sprue 轴衬(e) 和赛跑者(f) 。繁多块- 是否圆, 方或星的外在形状和大小被塑造- 整个地取决于射入点的位置和数量。各自的加热器弹药筒(b) 被连接到接线盒和被划分成几条热化电路在更大的工具。能量需要必须是充分的保留融解在赛跑者如果) 和在plasticized sprue 轴衬由要诀决定在造型洞。插座(g) 在赛跑者的末端被描出促进原料流动, 因为材料被他们牵制。这重要因为"能安置被烧的材料的静点,", 必须被避免。 热导电性核心(h) 被建立入繁多喷管(c) 被制造了从好heat-conducting 材料, 即, 铍铜。它形成空心空间(i) 与周围的喷管, 由塑料融解填装形成保温层。

Answer 2

热流道注塑模具热流道注塑模具上占有越来越重要的,因为它们的盈利能力, 因为他们允许快速自动循环. 的优势就在于这一特点浇注选手被淘汰,塑化和注射量的 射出成型机,可充分利用. 液态熔融传达来自spruebushing的蛀牙途经亚军. 熔体要保暖的同时,使之保持液体和可供 明年注射序列尽快其一是完了. 体积的选手必须有相应的镜头数量和周期时间,以避免过度 停留时间在热流道渠道. 发热通常是由加热器的子弹,这是僵化,或加热管,这是有弹性的. 加热筒能有瓦特密度可达60watt/cm2. 由于其出色的热传递可以装成热流道座孔紧宽容. 距离热流道加热器和墨盒至少应为10毫米,以避免经济过热的塑 材料. 图29显示了布置一式热流道模具的加热做菜. 该集成块(一)住房加热器盒(b),分布喷嘴(三),热电偶(d) 该spruebushing(E)和转轮(六). 外部形状和大小的集成块是否回合 方形或STAR形,完全取决于政府的立场和若干注射点. 个人加热器盒(b)连接到分线盒,并分为几个加热电路对较大型的工具. 能源需求必须足够维持熔体在跑步如果),并在塑spruebushing 截至冰山在成型腔. 插头(G)在两端的选手都是异形便利的物质流, 由于材料是挪作他用. 这是很重要的,因为"盲点",可房子烧掉物质,必须避免. 热传导核心(h)建成形喷管(三)已制成良好的热传导物质,如铍青铜. 它是一个中空的空间(一)与周围的喷嘴,这是由塑料熔体形成一个保温层.