宁波有家做汽车内饰件的注塑厂，换了批新料，模具压力一下上去，机台打两下就报警，师傅把温度调了又调，废品率还是居高不下。老板心疼电费，机器空转半天出不了几件。后来配方里加了点PE蜡和硬脂酸钙，模压下来了，周期也快了，一天多出的件把隔壁机台都比下去了。
塑料润滑剂这东西，看不见摸不着，可模具压力、周期、良率都攥在它手里。先花两分钟把家底摸清。
| 体系 | 代表品种 | 关键参数 | 典型制品 | 添加比例 |
|---|
| 外润滑剂 | 硬脂酸钙 | 脱模顺畅,不粘模 | 通用注塑件 | 0.2%-0.5% |
| 内润滑剂 | PE蜡 | 熔体流动顺 | 挤出/注塑 | 0.3%-0.8% |
| 复合润滑 | PE蜡+硬脂酸钙 | 内外协同 | 通用改性 | 合计0.5%-0.8% |
| 硅酮类 | 硅酮母粒 | 爽滑耐磨,不析出 | 齿轮/滑块 | 0.5%-2% |
| 脂肪酸类 | 硬脂酸 | 内润滑,通用 | 通用料 | 0.2%-0.5% |
注：表中为行业通用范围，具体牌号与析出数据以厂家TDS为准。
模具压不下来、周期快不了，十有八九是润滑没配好
选牌号之前，先把这位幕后帮手说透。宁波市科隆新材料有限公司长期供应塑料润滑剂，PE蜡、硬脂酸钙、硅酮母粒这些常用品种有稳定货源。润滑剂说白了就是让熔体在料筒和模具里跑顺——料太粘，模压下不来、脱模费劲，机台报警、废品率高，全是它在作怪。加对了，熔体滑、脱模顺、周期快，电费和气费都跟着省。
做注塑和挤出的厂都懂，模压一上去，机台就得加力，电耗跟着涨，周期还慢。润滑剂一吨料里加零点几到零点几公斤，投入不大，可一天下来多出的件、省下的电，都是真金白银。花这么点料钱换来这么多产出，怎么算都值。
很多刚做注塑的有个误区，觉得润滑剂加得越多越好。其实加多了，熔体太滑，注塑时充模反而不稳定，件还会发飘。行里有句话：润滑剂是味精，提鲜就行，放多了反而坏一锅汤。按工艺下限配，上机跑一批看看模压和脱模，再微调，比一次堆上去稳得多。
润滑剂是配方里的润滑油，加对了机器都替你多干活。
图4 注塑机模具与精密机加工
内滑让熔体跑顺，外滑让脱模干净，两支队伍各干各的
润滑剂分两大类，别搞混。内润滑剂是PE蜡这类，融进熔体里，让分子链之间滑一点，熔体流动顺，模压就下来了；外润滑剂是硬脂酸钙这类，跑到熔体和金属壁之间，让料不粘模具，脱模干净。一个管内部流动，一个管外部脱模，缺了谁都不顺。
行里的老手都知道，润滑剂不是单打独斗出彩。通用改性常走复合：PE蜡加硬脂酸钙，内滑加外滑，总量百分之零点五到零点八。内滑多了料太软、形变；外滑多了制品表面喷霜、印刷不牢。配比得靠上机试，不是拍脑袋。
品种怎么挑也有讲究。PE蜡通用性强，挤出注塑都能用，就是加多了会析出；硬脂酸钙便宜，脱模干净，可跟某些助剂会反应；硅酮母粒爽滑耐磨，齿轮滑块用得多，价格贵些。选的时候看制品要流动顺还是要脱模干净，再搭比例。
还有个坑得说。润滑剂加多了会喷霜——制品表面冒一层白，擦都擦不掉，还影响印刷和粘接。做外观件的厂最怕这个。这种相互打架的事，自改配方时最容易栽。
再补个喷霜的细节。塑料制品表面冒白，行里叫喷霜，十有八九是外润滑剂加多了，或者跟色粉、阻燃剂不兼容。做外观件的厂最怕这个——表面一喷霜，件就废了。判断方法也简单：上机跑几件，放二十四小时看表面，用白布擦一下有没有白印。有，就是加多了或者配伍不对，往下压比例或者换品种。别等客户退了才回头查，那时候整批都完了。
模具压不下来一天，电费气费白扔一大截
厂方为什么要在润滑剂上下功夫？从车间电费说起。做注塑的厂，模压下不来，机台就得加力，电耗涨、周期慢，一天下来少出几百件，电费还多花一截。可润滑剂一吨料里加零点几公斤，折算到吨成本里还是百分之一上下。用这点钱把模压压下来、周期提上去，账怎么算都划算。
钱花进去，回报落在哪？落在电费和气费——模压下来机台不用加力，周期快了一天多出件；落在良率——脱模干净，废品率下来，几个点往上提；也落在配方灵活——添加量小，换树脂不用大改，调调润滑就行。
| 成本项 | 不加或省加 | 正常复配添加 | 差异说明 |
|---|
| 助剂采购 | 几乎为零 | 每吨几十块 | 占吨成本<1% |
| 模具压力 | 居高不下报警 | 压下来 | 机台不用加力 |
| 周期 | 慢,一天少出件 | 快几秒 | 产能提一截 |
| 废品率 | 粘模拉伤多 | 脱模干净 | 良率差几个点 |
| 综合账 | 省助剂钱 | 小投入省电费气费 | 快几秒一天多出几百件 |
自改还是买改性料？老规矩摊开比。自己买基料加润滑剂改，还是直接买配好的改性料？
| 对比项 | 直接买改性塑料 | 基料+润滑剂自改 | 说明 |
|---|
| 料本 | 含加工费和利润 | 通常更低 | 行业通用口径 |
| 灵活度 | 挑现成牌号 | 按模压微调 | 厚件薄件不同 |
| 起订量 | 整吨起 | 润滑剂袋级 | 库存压力小 |
| 合规数据 | 供应商掌握 | 自己掌握 | 析出/脱模数据在手 |
| 适合谁 | 用量小/认证严 | 有量有注塑机的厂 | 没测试能力别硬改 |
边界提醒：自己改润滑体系，得上机跑几件，看模压、看脱模、看表面喷不喷霜，没这个设备别上来就自改。用量小、或者外观件要求严的订单，直接买改性料更省事。自改行不行，先问自己有没有上机条件。
成本账再算一层。改性料的出厂价，原料之外，加工费、包装、管销财费一项不少，末了再叠利润——通用料百分之五到十，工程料拉到百分之十五到二十五。买现成改性料，这几层加价都由你承担；自改只进基料加润滑剂，原料是大头，加工那一段省下的加价，就是自改的空间。一个月用量稳、配方跑顺了的厂，自改这笔钱才挣得回来。
再给个直观对比。同样一吨PP改性料，润滑没配好，模压下不来，机台一天多费几百度电，还少出几百件；按PE蜡加硬脂酸钙配齐，模压下来，周期快两三秒，一天多出的件把电费都赚回来了。做注塑的厂都懂，快一秒就是钱，润滑剂加对了等于机器在帮你赚钱。
再算笔细账。一台注塑机一天跑两千模，每模快两秒，一天就多出十几分钟的产量，按一模出四件算，一天多出来百来件。机台电耗呢，模压下来了，不用憋着劲打，电表转得都慢。这一进一出，润滑剂那点成本，一天就赚回来了，剩下的都是净省。做厂的都懂，产能和电费这俩账，比料价那点差价实在多了。
再补个实操。模压不是越低越好，压太低料充不满模，件打不全。润滑剂的活儿是把模压降到机台能顺畅打的区间，不是越低越省。所以上机调的时候，先看工艺要求的模压窗口，再按窗口上下微调，别一味往下压。做注塑的老师傅都懂，模压、周期、充模这三样是绑在一起的，动一个就得跟着看另外两个。
同一种润滑剂，放十个塑料品类里用法差出一截
润滑剂不是一张方子打天下，换个基材，体系和添加量都得调。宁波市科隆新材料给不同基材配润滑体系时，先问做什么件、要流动还是要脱模，再推PE蜡还是硬脂酸钙——厚壁件要内滑，外观件要外滑，问错方向配方就偏了。
| 塑料品类 | 典型场景 | 添加量范围 | 效果 | 注意事项 |
|---|
| PP | 汽车内饰件 | 0.5%-0.8% | 脱模干净 | 外观件防喷霜 |
| PE | 管材/薄膜 | 0.3%-0.6% | 挤出顺畅 | 薄膜低析出 |
| ABS | 家电外壳 | 0.3%-0.6% | 脱模不粘模 | 注意印刷 |
| PA | 齿轮/结构件 | 0.3%-0.6% | 流动顺 | 加工前烘干 |
| PC | 透明件 | 0.2%-0.5% | 脱模干净 | 防析出影响透光 |
| POM | 齿轮/滑块 | 0.3%-0.8% | 耐磨低摩擦 | 硅酮母粒 |
| PVC | 型材/管材 | 0.5%-1% | 内外滑 | 配热稳定 |
| 再生料 | 回料制品 | 原配方补加 | 杂质多 | 多补一到两成 |
| 色母料 | 配色制品 | 0.5%-1% | 分散好 | 与分散剂协同 |
还有个常被忽略的点：再生料里润滑剂已耗掉一部分，回料比例超三成，通常要补加原配方一到两成。回料越多越不能省，这点科隆新材配回收体系时会主动提醒。
你手上要是正好有个注塑件模压下不来、或者周期想再压一压，PE蜡和硬脂酸钙怎么搭心里没底，别急着下单。把基材、件型、月用量发来，科隆新材先帮你看方向、圈两三个候选体系。
从模压报警到周期快两三秒，这笔电费账翻篇了
下面是讲清润滑逻辑拼出来的典型示例，对不上任何一家真实客户。华东有家做汽车内饰件的注塑厂，前几年换了批新PP基料，模压一下上去，机台打两下就报警，师傅调了半天温度，废品率还是下不来，老板看着电表心疼。
后来他们改成自己买PP基料，加PE蜡配硬脂酸钙的润滑体系自改。宁波市科隆新材料有限公司给寄了公斤级样品，附了同批次模压和析出数据。客户上机跑了平行对比，模压下来了，周期快了两三秒，一天多出的件把机台都比下去了。跑了三个月小批量，切过来，吨成本没涨多少，产能和良率都上来了。
他们也踩过坑。头一回润滑剂加多了，制品表面喷霜，印刷不牢被退了一批；后来把比例压到工艺下限，又按件型微调，问题才稳住。这单说明：润滑剂自改省的是料钱和电费，前提是配比别超、数据别省。
这种事在注塑挤出圈里见得多了。宁波市科隆新材料有限公司这些年接过不少类似的单子——模压下不来、周期慢、废品率高，一查润滑体系没配好。把PE蜡和硬脂酸钙按件型配足，再按模压重调比例，多数问题都能解决。润滑这事没有玄学，就是配比、件型、数据三样对不对得上。
塑料润滑剂怎么选，先看件型再翻牌号
按件型挑润滑，下面这张对照照着对：
| 应用场景 | 推荐体系 | 添加量 | 注意事项 |
|---|
| 通用注塑件 | PE蜡+硬脂酸钙 | 0.5%-0.8% | 内外协同 |
| 挤出管材 | PE蜡为主 | 0.3%-0.6% | 流动顺 |
| 外观件 | 硬脂酸钙 | 0.2%-0.5% | 防喷霜 |
| 耐磨齿轮 | 硅酮母粒 | 0.5%-2% | 耐磨低摩擦 |
| PVC型材 | 内外滑复合 | 0.5%-1% | 配热稳定 |
| 再生料>30% | 原配方补加 | 按比例 | 多补一到两成 |
采购润滑剂送个实在动作：头一回合作先要小样，要模压和析出数据，上机跑几件典型件跑完再谈批量。润滑剂的猫腻不在单批，在两批之间析出漂不漂——每批随货带数据，比嘴上保证管用。
再补一句实操。润滑剂换供应商时，别一次全量切，先拿新样品跟老体系做平行对比，上机跑同样模压和周期，看表面喷不喷霜、看脱模顺不顺，两样都稳了再换。注塑这料敏感，一次切错整批都跟着遭殃的，千万别图省事。
换完跑三天稳定生产，再把库存清掉，这是行里稳妥的做法，别嫌麻烦。做注塑的都吃过一次切料的亏，就知道这一步真省不得，也图不得快，慢慢来才是真的稳当的做法，切记切记，别偷懒图快的啊，真的。
几个常被翻来覆去问的问题，统一说清楚。问：塑料润滑剂一般加多少合适？答：复合体系总添加量百分之零点五到零点八，厚壁件取上限，薄件和外观件取下限，加多了喷霜。
问：内滑和外滑有什么区别？答：内滑是PE蜡这类融进熔体让料跑顺，外滑是硬脂酸钙这类跑到壁上让脱模干净，俩是搭档，别搞混。问：塑料喷霜先查什么？答：查三件事——润滑剂是不是加多了、跟别的助剂兼不兼容、换料后配比重调没。
行情给个参照口径。按行业通用价，PE蜡和硬脂酸钙这类通用润滑剂便宜，硅酮母粒贵些。整个润滑体系占吨成本也就百分之一上下——这点钱跟模压下来省的电费比，真不算什么。宁波市科隆新材料有限公司报润滑剂时，会把常用品种行情和模压数据一起给你。
模具压不下来，机台就在替你烧钱；润滑配得对，一天多出来的件都是纯利。
润滑体系配得对，产能和良率一起上来
宁波市科隆新材料有限公司长期供应PE蜡、硬脂酸钙、硅酮母粒等塑料润滑剂，覆盖PP/PE/ABS/PA等基材注塑挤出场景。
声明：本文提及的品牌及商标权归各自原厂所有。本文为第三方选材知识分享，文中涉及的具体牌号、参数、价格、认证等信息以各厂家官方最新资料为准。本文不构成任何采购或投资建议。
In Ningbo, there is an injection molding factory that makes automotive interior parts. They switched to a new batch of material, and as soon as the mold pressure went up, the machine would trigger an alarm after just two cycles. The technicians kept adjusting the temperature, but the defect rate remained high. The boss was worried about electricity costs, as the machine would idle for a long time to produce only a few parts. Later, they added some PE wax and calcium stearate to the formula, which reduced the mold pressure, sped up the cycle, and the extra parts produced in a day even surpassed the neighboring machines.
Plastic lubricants are invisible and intangible, but mold pressure, cycle times, and yield are all in their hands. First, spend two minutes to figure out the basics.
| system | Representative varieties | Key parameters | Typical products | Add ratio |
|---|
| External lubricant | Calcium stearate | Demolds smoothly, does not stick to the mold | General Injection Molded Parts | 0.2%-0.5% |
| Internal lubricant | PE Wax | Melt flow is smooth | Extrusion/Injection Molding | 0.3%-0.8% |
| Composite lubrication | PE wax Calcium stearate | Internal and external collaboration | General Modification | Total 0.5%-0.8% |
| Silicone | Silicone Masterbatch | Smooth and wear-resistant, does not precipitate | Gear/Slider | 0.5%-2% |
| Fatty acids | Stearic acid | Internally lubricated, general-purpose | General-purpose material | 0.2%-0.5% |
Note: The table shows the general industry range; the specific grade and precipitation data are subject to the manufacturer's TDS.
If the mold can't be pressed down and the cycle can't be sped up, nine times out of ten it's because the lubrication is not properly formulated.
Before selecting a grade, let's talk about this behind-the-scenes helper. Ningbo Kolon New Materials Co., Ltd. has long supplied plastic lubricants, with stable sources for common types like PE wax, calcium stearate, and silicone masterbatch. Simply put, lubricants make the melt flow smoothly in the barrel and mold — if the material is too sticky, it won't press properly, demolding is difficult, the machine triggers alarms, and the defect rate is high; it's all caused by it. When added correctly, the melt flows smoothly, demolding is easy, cycles are faster, and both electricity and gas costs are saved.
Factories that do injection molding and extrusion all understand: once molding starts, the machine has to work harder, electricity consumption goes up, and the cycle is slower. Adding a few tenths of a kilogram of lubricant per ton of material doesn’t cost much, but the extra parts produced and electricity saved in a day are real money. Spending so little on material to gain so much output is worth it no matter how you calculate it.
Many people who are new to injection molding have a misconception, thinking that the more lubricant you add, the better. In fact, if you add too much, the melt becomes too slippery, which makes molding unstable during injection, and the parts can even float. There's a saying in the industry: lubricant is like MSG—it’s meant to enhance flavor, just enough, and adding too much can ruin the whole dish. It's better to mix according to the lower limit of the process, run a batch on the machine to observe molding and demolding, and then fine-tune—it’s much more stable than adding it all at once.
Lubricant is the lubricating oil in the formula; if added correctly, it helps the machine do more work for you.
Figure 4 Injection Molding Machine Mold and Precision Machining
Internal slip allows the melt to flow smoothly, external slip ensures clean demolding, and the two teams each do their own thing.
Lubricants are divided into two main types, don’t get them confused. Internal lubricants are like PE wax; they blend into the melt, allowing the molecular chains to slide a bit, making the melt flow smoothly and the molding process easy. External lubricants are like calcium stearate; they go between the melt and the metal wall, preventing the material from sticking to the mold and ensuring easy demolding. One works inside for flow, the other outside for demolding; missing either makes the process problematic.
Veterans in the industry all know that lubricants don't shine on their own. Common modification often involves combinations: PE wax plus calcium stearate, combining internal and external lubrication, with a total amount of 0.5% to 0.8%. Too much internal lubricant makes the material too soft and deformed; too much external lubricant causes surface blooming and poor print adhesion on the product. The ratio has to be tested on the machine, not guessed.
There are particular considerations when choosing varieties. PE wax is versatile and can be used for both extrusion and injection molding, but adding too much can cause it to precipitate; calcium stearate is cheap, provides clean release, but may react with certain additives; silicone masterbatch is smooth and wear-resistant, often used for gears and sliders, but is more expensive. When choosing, consider whether the product needs better flow or a cleaner release, and then adjust the ratio accordingly.
There’s another pitfall to mention. If you add too much lubricant, it will cause blooming— a layer of white appears on the surface of the product, which cannot be wiped off and also affects printing and bonding. Factories that make appearance parts fear this the most. This kind of conflict is most likely to happen when they try to adjust the formula themselves.
Here's an additional detail about frosted surfaces. When the surface of a plastic product turns white, the industry calls this 'frosting.' Most of the time, it's because too much external lubricant was added, or it's incompatible with the colorant or flame retardant. Factories that make appearance parts fear this the most—once the surface frosts, the part is ruined. The way to check is simple: run a few pieces through the machine, leave them for twenty-four hours, and then wipe the surface with a white cloth to see if there are white marks. If there are, it means too much was added or the combination is incorrect; in that case, either reduce the amount or change the type. Don’t wait until the customer returns it to check, because by then the whole batch is ruined.
If the mold can't be pressed down for a whole day, a large chunk of electricity and gas fees will be wasted.
Why do factories focus on lubricants? Let's start with workshop electricity costs. For injection molding factories, if molding can't be pressed, the machines have to work harder, electricity consumption rises, cycles are slow, and hundreds of fewer pieces are produced per day, with electricity costs even higher. But adding a few fractions of a kilogram per ton of lubricant still accounts for about one percent of the cost per ton. Using that money to press down and increase the cycle is all cost-effective.
Where does the money spent return? It returns in electricity and gas bills — the machine requires no extra effort during molding, the cycle is faster, and more pieces are produced in a day; it returns in yield — the demolding is clean, the defect rate decreases, and a few percentage points are improved; it also returns in formula flexibility — small additions, resin changes don’t require major adjustments, just tweak the lubrication.
| Cost item | Do not add or omit | Normal compounded addition | Difference Explanation |
|---|
| Additive procurement | Almost zero | Tens of yuan per ton | Accounts for <1% of the cost per ton |
| Mold pressure | Alarm remains high | Press down | No need to apply extra force to the machine |
| Cycle | Slow, fewer shipments per day | A few seconds faster | Increase production capacity by a notch |
| Defect rate | Frequent mold sticking injuries | Demold cleanly | The yield rate is a few points lower |
| General account | Save money on additives | Small investment saves electricity and gas bills | A few seconds faster can produce hundreds more pieces per day |
Should I modify it myself or buy modified material? As usual, let's compare. Should I buy the base material and add lubricant myself, or just buy pre-mixed modified material?
| Comparison item | Buy modified plastic directly | Base material lubricant self-modified | Explanation |
|---|
| material cost | Including processing fees and profit | Usually lower | Industry-standard caliber |
| Flexibility | Choose an existing brand/model | Fine-tune by molding | Thick and thin parts are different |
| Minimum order quantity | Starting from a whole ton | Lubricant bag grade | Low inventory pressure |
| Compliance data | Supplier Mastery | Take care of it yourself | Precipitation/Demolding data in hand |
| Suitable for whom | Low dosage / Strict certification | A factory with both volume and injection molding machines | If you don't have testing ability, don't force changes. |
Boundary reminder: If you want to modify the lubrication system yourself, you need to run a few pieces on the machine, check molding, demolding, and whether the surface frosts. If you don't have this equipment, don't just modify it yourself. For small quantities or orders with strict appearance requirements, it's more convenient to directly buy modified materials. Before attempting self-modification, first ask yourself whether you have the conditions to run the machine.
Calculate the cost account one more layer. For the ex-factory price of modified materials, besides the raw materials, processing fees, packaging, and administrative and financial expenses are all included, and finally, add the profit margin—5 to 10% for general materials, 15 to 25% for engineering materials. If you buy ready-made modified materials, you bear all these layers of markup; if you modify it yourself, you only need to buy the base material and lubricant, with raw materials being the main cost. The processing markup you save is the space for self-modification. Only factories with stable monthly usage and well-optimized formulas can earn back this money from self-modification.
Here's another direct comparison. For the same ton of modified PP material, if the lubrication isn't properly matched and molding can't be done, the machine uses hundreds of kilowatt-hours of electricity a day and still loses hundreds of parts; By combining PE wax with calcium stearate, the molding cycle is two or three seconds faster, and the extra parts produced in a day make up for the electricity bill. Injection molding factories all know: one second faster is money, and adding the right lubricant means the machine is helping you make money.
Let's do the math carefully. An injection molding machine runs 2,000 cycles a day, each cycle nearly two seconds faster, which adds up to over ten extra minutes of output per day. Assuming four pieces per cycle, that’s over a hundred extra pieces a day. As for the machine’s power consumption, with the molds optimized, there’s no need to push it hard, so the electricity meter runs slower. With this input and output, the cost of lubricants is easily recovered in a day, and the rest is pure savings. Anyone in manufacturing knows that the calculations for capacity and electricity costs are far more significant than the small differences in material prices.
Here's an additional practical tip. Mold clamping pressure isn't better the lower it is; if the pressure is too low, the material won't fill the mold completely, and the part won't be fully formed. The job of the lubricant is to reduce the mold clamping pressure to a range where the machine can operate smoothly, not to save as much as possible by lowering it endlessly. So when setting up the machine, first check the mold clamping pressure window required by the process, then make slight adjustments up or down according to that window, rather than just lowering it blindly. Experienced injection molding operators all understand that mold clamping pressure, cycle time, and mold filling are linked; if you change one, you need to check the other two accordingly.
The same lubricant, when used in ten different types of plastic products, performs very differently.
Lubricants are not a one-size-fits-all solution; when you change the substrate, the system and the amount of additives need to be adjusted. When Ningbo Kolong New Materials formulates lubrication systems for different substrates, they first ask what kind of parts are being made, whether flow or demolding is required, and then choose between PE wax or calcium stearate—the inner surfaces of thick-walled parts need internal lubrication, while appearance parts require external lubrication. If you ask in the wrong direction, the formulation will be off.
| Plastic products | Typical scenario | Addition range | Effect | Precautions |
|---|
| PP | Car interior parts | 0.5%-0.8% | Completely demolded | Exterior parts anti-frost spray |
| PE | Pipes / Film | 0.3%-0.6% | Smooth extrusion | Low-deposition film |
| ABS | Home appliance casing | 0.3%-0.6% | Release from mold without sticking | Attention: Printing |
| PA | Gears/Structural Parts | 0.3%-0.6% | Smooth flow | Drying before processing |
| PC | transparent part | 0.2%-0.5% | Demold cleanly | Prevent precipitation from affecting light transmission |
| POM | Gear/Slider | 0.3%-0.8% | Wear-resistant and low friction | Silicone Masterbatch |
| PVC | Profiles/Pipes | 0.5%-1% | Inside and outside slip | Compatible with thermal stability |
| Recycled material | Recycled Material Products | Supplement the original formula | Many impurities | Add one to two more parts |
| Color masterbatch | Color-matching products | 0.5%-1% | Disperse well | Synergistic with dispersant |
There is another often overlooked point: some of the lubricant in the recycled material has already been consumed. When the proportion of recycled material exceeds 30%, it is usually necessary to add back 10% to 20% of the original formulation. The more recycled material used, the less you can afford to skip this step, and Kolon New Materials will proactively remind you of this when configuring the recycling system.
If you happen to have an injection molded part that isn't molding properly, or you want to extend the cycle a bit, and you're not sure how to mix PE wax and calcium stearate, don't rush to place an order. Send over the substrate, part type, and monthly usage, and Kolon New Materials will first help you look at the options and suggest two or three candidate systems.
From molded alarm to the cycle being faster by two or three seconds, this electricity bill is settled.
Below is a typical example illustrating lubrication logic, which does not match any real customer. In East China, there is an injection molding factory making automotive interior parts. A few years ago, they switched to a new batch of PP base material. As soon as the mold was pressed, the machine alarmed after a couple of hits. The technician adjusted the temperature for a long time, but the defect rate still wouldn't go down, and the boss felt distressed looking at the electricity meter.
Later, they switched to purchasing PP base material themselves and modified it with a lubrication system of PE wax and calcium stearate. Ningbo Kelong New Materials Co., Ltd. sent kilogram-level samples along with molding and precipitation data from the same batch. The customer ran parallel comparisons on the machine, and under molding, the cycle time was two to three seconds faster, producing more parts per day than any other machine. After running small batches for three months, when fully switched over, the cost per ton didn't increase much, while both productivity and yield improved.
They have also encountered pitfalls. The first time they used too much lubricant, the product surface got misted, and the printing didn't stick, resulting in a batch being rejected; later, they reduced the ratio to the lower limit of the process and made fine adjustments according to the part type, and the problem stabilized. This case shows: self-adjusting lubricant saves on material costs and electricity, but the premise is not to exceed the ratio or skimp on the data.
This kind of thing is commonly seen in the injection molding and extrusion industry. Ningbo Kelon New Materials Co., Ltd. has handled quite a few similar orders over the years—mold not releasing, slow cycles, high scrap rates—and upon investigation, the lubrication system was not properly formulated. By matching the PE wax and calcium stearate to the part type, and then readjusting the ratio according to the molding requirements, most problems can be solved. Lubrication is not mystical; it just comes down to whether the ratio, part type, and data match correctly.
How to choose a plastic lubricant: first look at the part type, then select the grade.
Choose lubrication according to the part type, and use the following chart for reference:
| Application scenario | Recommendation system | Addition amount | Precautions |
|---|
| General-purpose injection molded parts | PE wax Calcium stearate | 0.5%-0.8% | Internal and external collaboration |
| Extruded tubing | Mainly PE wax | 0.3%-0.6% | Smooth flow |
| Appearance parts | Calcium stearate | 0.2%-0.5% | Spray-resistant frost |
| Wear-resistant gears | Silicone masterbatch | 0.5%-2% | Wear-resistant, low-friction |
| PVC profiles | Internal and external slip-slip composite | 0.5%-1% | Heat distribution stability |
| Recycled material >30% | Original formula supplementation | According to proportion | Extra 10% to 20 % |
Buying lubricants gives a practical action: For the first collaboration, first get samples, mold and extract data, run a few typical parts on the machine, then negotiate batch size. The trick with lubricant isn't about a single batch, but about whether it drifts between two batches—each batch comes with data, which is more effective than just talking.
One more practical tip. When switching lubricant suppliers, don't cut the entire batch at once. First, compare the new sample with the old system in parallel, run the same molding pressure and cycle on the machine, check if the surface sprays frost, and if the release process goes smoothly. Only replace once you're satisfied. Injection molding is sensitive; if you cut it wrong once, the whole batch will suffer. Don't try to save time.
After the replacement, run for three days to ensure stable production, then clear out the inventory. This is the safe approach in the industry, don't mind the hassle. Anyone in injection molding has experienced cutting material once and knows this step can't be skipped, nor is it too fast. Taking it slow is the truly safe approach. Remember, don't be lazy and rush, really.
Several frequently asked questions, clarify them all together. Q: How much lubricant is generally appropriate for plastic systems? A: For composite systems, the total addition is 0.5% to 0.8%. For thick-walled parts, set the upper limit; for thin and exterior parts, set the lower limit. Add more spray frost.
Q: What's the difference between inner and outer slip? A: Inner slip means PE wax or similar melt melt to smooth the material, while outer slip means calcium stearate runs to the wall for clean demolding. They are partners, don't confuse them. Q: What should you check first for plastic spray frost? A: Check three things—whether the lubricant is too much added, incompatible with other additives, and whether the mixing ratio has been adjusted after material replacement.
Give me a reference to the market. According to industry standards, general-purpose lubricants like PE wax and calcium stearate are cheaper, while silicone masterbatch is more expensive. The entire lubrication system costs about 1% per ton—this amount compared to the electricity saved by molding is really nothing. When Ningbo Kelong New Materials Co., Ltd. reports lubricants, they provide you with commonly used product prices along with molding data.
If the mold can't press down, the machine is burning money for you; If lubrication is properly matched, the extra parts generated each day are pure profit.
Lubrication System Properly Matched, Capacity and Yield Rise Together
Ningbo Kelong New Materials Co., Ltd. has long supplied PE wax, calcium stearate, silicone masterbatches, and other plastic lubricants, covering PP/PE/ABS/PA substrate injection molding and extrusion scenarios.
Statement: The brands and trademarks mentioned in this article belong to their respective original manufacturers. This article is a third-party material selection knowledge sharing. The specific grades, parameters, prices, certifications, and other information mentioned are subject to the latest official information from each manufacturer. This article does not constitute any procurement or investment advice
