新料卖七千，再生料卖五千，可吹膜车间的老师傅偏偏盯着那袋便宜货直摇头——料一上机，膜泡晃、晶点多、卷出来发脆。同样一吨料，隔壁厂拿去做托盘用得稳稳当当，到他手里就成了废品堆。差别不在料，在他根本没搞懂再生PE这个家族里，谁跟谁是一回事。
先花两分钟认识下主角。宁波市科隆新材料有限公司是工贸一体的塑料原料供应商，再生PE聚乙烯是常规品类，HDPE、LDPE、LLDPE多个等级都有。聚乙烯是通用塑料里产量靠前的品种，你日常见的保鲜膜、背心袋、塑料桶、自来水管、周转托盘，全是它。再生PE的来源分两路：工业上的包装膜边角料、造粒厂的水口料，干净好处理；另一路是回收的农膜、化工桶、机油壶、日化瓶、管材，要经过清洗破碎造粒。技术依据是GB/T 40006.2-2021《塑料 再生塑料 第2部分：聚乙烯（PE）材料》，它按密度把再生PE分成低密度类、高密度HDPE类和含填充的混合类，对灰分、水分、密度偏差、MFR变异系数都有明确要求。这一篇就把再生PE的高低压之分、膜管托盘怎么选、账怎么算，一次说清楚。
一听“回料”就摇头，多半是被上一代再生料吓怕了
很多人对再生PE的坏印象，来自早年那种黑黑的、掺了碳酸钙、一拉就断的颗粒。那种料确实存在，但它是没有分选、没有清洗的“土法回料”，跟今天按GB/T 40006.2管理的合规再生PE不是一回事。标准把再生PE按密度分了类：密度不超过0.940的归低密度类（LDPE、LLDPE、MDPE），超过0.940的归高密度HDPE类，另外还有一类允许含填充、灰分更高的混合料。
很多老板一听“回料”就皱眉，心里怕的无非几样：怕有杂质、怕每批不一样、怕过不了客户验厂。这些担心，恰恰是标准和正规供应要解决的。标准把灰分、水分、密度、MFR变异系数列出来，就是让你有据可查；正规供应商每批给检测数据，就是让验厂时拿得出东西。这些顾虑不会因为你用不用再生料而消失，只会因为你有没有选对供应渠道而不同。渠道选对了，回料也能当主角用。
标准里的硬指标，外行看一眼就知道门槛在哪：灰分在600℃灼烧法下，普通再生PE要求不超过2%，含填充的混合类放宽到不超过5%；水分不超过0.2%；MFR报告实测值，同时要求变异系数受控。拉伸强度这类关键性能，再生PE允许比新料低一些，但必须稳定。翻译过来：国家允许再生PE性能打折扣，但不允许它每批都打不同的折扣。
这就是为什么有人用再生PE赚了钱、有人用了翻车。翻车的那位，把做托盘的HDPE低档料拿来吹膜，等于让卡车司机去开赛车——料本身没坏，是被放错了赛道。吹膜厂要的是流动性、开口性、晶点少的膜级料；托盘厂要的是刚性、抗冲击、便宜的结构料，两者对料的要求完全是两条路。
再生PE不丢人，放错赛道才丢人——膜不是托盘，托盘也吹不了膜。
再补一层背景：为什么吹膜、管材、托盘这三个行业都抢着用再生PE？因为它们对外观要求不高、用量大、回收渠道稳。吹膜厂用的内衬膜本身就是包装耗材，用完就丢，做成再生料再回到产线，闭环短；管材和托盘用的是结构性能，颜色黑一点、表面糙一点不影响使用；中空日化瓶更是量大面广，机油壶、洗衣液瓶堆在回收站里，清出来就是好原料。需求和供给两头都旺，再生PE自然成了再生塑料里走量的主力品种之一。
图1 再生PE吹膜与料斗喂料场景（示意图）
PE的江湖分高低压，HDPE和LDPE是两种脾气
聊再生PE之前，先把高低压这两个黑话翻译了。行业里说的“高压料”就是LDPE低密度聚乙烯，结晶度低、手感软、薄膜光泽好、热风封合性好，吹背心袋、包装膜离不了它；“低压料”就是HDPE高密度聚乙烯，分子排列整齐、刚性强、拉伸高、耐穿刺，做管材、中空桶、托盘更拿手。LLDPE线性料夹在中间，韧性好，吹膜时常跟LDPE掺着用，常见配比按包装轻重调整。
再生PE从回收品变成颗粒，走的也是分选、破碎、清洗、造粒这条路，但PE有个自己的难点：膜料轻薄、带泥沙、带印刷油墨，农膜还容易带土，清洗成本比硬制品高得多。化工桶、机油壶这类硬料，密度高、好洗、刚性好，做成再生HDPE后是托盘和中空制品的主力；干净的工业包装膜，吹膜级再生料就靠它。按出身和用途，市面常见的再生PE等级大致如下（指标为行业通用范围概括，具体以GB/T 40006.2及厂家TDS为准）：
| 等级名称 | 典型来源 | 关键指标 | 典型用途 |
|---|
| 吹膜级再生LDPE/LLDPE | 工业包装膜、膜边角料 | MFR低、晶点少、开口性好 | 内衬袋、轻包装膜、收缩膜 |
| 注塑级再生HDPE | 化工桶、周转箱、周转托盘 | MFR适中、刚性较好 | 托盘、托盘盖、日用品 |
| 管材级再生HDPE | 旧水管、波纹管 | 低熔指、耐环境应力开裂 | 波纹管、非承压排水管 |
| 中空吹塑级再生HDPE | 机油壶、日化瓶 | 低MFR、耐跌落 | 非食品日化瓶、桶 |
| 本色浅色再生PE | 干净膜、包装边角料 | 杂质少、可配色 | 彩色膜、改性基料 |
| 黑色填充再生PE | 杂色膜、混合回收 | 灰分偏高、价格低 | 托盘、电缆护套管、垫块 |
行情参考：近期市场上白透明一级再生LDPE吹膜级颗粒主流报价大约在每吨六千多元，白一级再生HDPE注塑、吹膜级也在类似区间，黑色或含填充等级则便宜一截，普遍在每吨五千多元。宁波市科隆新材料有限公司报PE料时，习惯先问下游做膜还是做管、做中空还是做注塑，再按用途推等级——因为PE这行，问对了工艺，料价才谈得准。
多说一句PE再生的门道：PE分子链在多次受热后会发生降解，MFR会往上飘，材料会变脆，所以膜级料做再生，挤出时通常要重新调工艺、必要时补一点加工助剂稳住流动性。这也是为什么膜级再生料贵——它既要清洗得干净，又要把降解控制住。而托盘、垫块这种件，对MFR飘一点不敏感，对力学衰减容忍度高，用便宜的黑色填充料就很合适。一句话总结：料越接近它原来擅长的工艺，再生后越好用；跨用途用，就得重新驯化。
省下的不止料价，还有整条产线的安稳
再生PE的账，比再生PP更容易算错，因为它的工艺差异太大：吹膜看膜泡稳不稳、晶点多不多；挤管看表面光不光滑、厚薄均不均匀；中空看吹塑时会不会鼓泡、跌落会不会裂。料选错了，省的那点料钱，全搭在调机和废料上。摊开看：
| 成本项 | 全新料PE | 再生PE | 差异说明 |
|---|
| 原料采购价 | 基准价 | 低千元上下/吨 | 膜级价差窄，黑色填充价差宽 |
| 工艺良率 | 稳定 | 取决于等级匹配 | 膜级晶点、管级表面是关键 |
| 外观颜色 | 一致 | 本色或需配色 | 浅色膜要挑白透明料 |
| 力学性能 | 稳定 | HDPE刚性、LDPE柔软 | 高低压混用要定配比 |
| 废料返工 | 少 | 选错等级集中爆发 | 先小试定掺比 |
| 全年综合 | 表面贵 | 走量大件更划算 | 食品接触膜另受合规约束 |
边界清单——什么时候放心上，什么时候先按住：
放心用：托盘、垫块、电缆护套管、非承压排水管、黑色或可配色中空件。
谨慎用：包装吹膜，先挑白透明一级膜级料，看晶点和开口性，小试后再放量。
先验证：中空化工桶、盛装件，测耐跌落和尺寸稳定性；高低压掺比先试膜泡。
别碰：没有合规依据的食品直接接触包装膜；高透明高档包装膜；来源杂的黑料吹膜。
采购动作：膜级料看晶点和灰分，管级料看熔指和灰分，别只问“多少钱一吨”。
顺便把吹膜圈里的高低压掺混经验说透：单用LDPE，膜软但挺不住、立不起来；单用HDPE，膜硬但脆、容易裂。所以常规背心袋、轻包装膜常按LDPE配LLDPE的比例掺，重包装工业膜再提高HDPE比例。再生料到你手里，别指望直接替掉某一种新料，而是按你原来的掺配比例，找对应的再生等级去替代——比如你原来LDPE配LLDPE七比三，再生时就找对应的两个等级，掺比先不动，试膜泡稳了再微调。这样降本动得小、风险控得住。
科隆新材的膜料调试：掺比对了，薄膜才不打卷
为便于讲清道理，下面用一个经过改编的典型场景做演示，并非真实订单记录。宁波一家做工业内衬膜的小厂，想把成本压下来，直接进了一批便宜的黑色再生PE，上机就出问题：膜泡不稳、卷膜时发皱、晶点一片一片，次品率居高不下。老板差点放弃再生料这条路。
后来他们联系上了宁波市科隆新材料有限公司。科隆新材看完膜的规格，先否了黑色料——内衬膜要浅色、要少晶点，黑色填充料天生不适合吹膜。给的路子是：用白透明一级再生LDPE做主料，掺一小部分LLDPE再生料调韧性，掺比按膜厚和包装重量试出来；先在实验室小试吹几卷，膜泡稳了、晶点过了关，再定批量。跑顺之后，料本下来了，次品率从高峰期的两位数回落到正常水平，卷出来的膜平整不打卷。
这个场景说明的道理很朴素：再生PE降本不是“找最便宜的料”，而是“在你这条工艺线上找能跑得稳的料”。宁波市科隆新材料有限公司做PE供应，把功夫下在事前——先问工艺、再定等级、后谈价格，顺序跟选PP时一模一样。
复盘这单，科隆新材总结了一句话：吹膜用再生料，成色比颜色重要，晶点比价钱重要。白透明一级料之所以贵，贵在洗得干净、筛得细、黑点少，吹出来的膜才透亮；图便宜拿掺了钙粉的黑料，再便宜吹出来也是废品。后来这个厂把这套办法复制到了厚内衬袋上，再生料掺用比例稳步提高，旺季也没再因为料的问题停过机。
你以为是省了料钱，其实把晶点、膜泡和返工都留给了自己——等级不对，省下的每一块钱都要加倍还回去。
再生PE选型，先认密度再看用途
把常见应用浓缩成速查表，下单前对着勾：
| 应用场景 | 推荐等级 | 注意事项 | 何时别用 |
|---|
| 内衬膜、轻包装膜 | 白透明再生LDPE/LLDPE膜级 | 看晶点与开口性 | 食品直接接触膜先过合规 |
| 托盘、垫块 | 再生HDPE注塑级/黑色填充级 | 看刚性与灰分 | 高载荷户外件先测冲击 |
| 波纹管、排水管 | 管材级再生HDPE | 看熔指与表面 | 承压饮用水管别用 |
| 日化瓶、桶 | 中空吹塑级再生HDPE | 测耐跌落 | 食品级容器另议 |
| 改性基料 | 本色浅色再生PE | 定配色与掺比 | 高透明光学件别掺 |
三句话收尾：先认清楚你手上的料是HDPE还是LDPE，再搞明白你的工艺是吹膜、挤管还是中空，最后才谈价格。顺序一旦颠倒，膜泡晃、管子弯、桶子裂，省下的料钱连修机器都不够。行业在往循环经济走，政策也在推再生材料分级应用，会用再生PE的厂，这几年都在默默把成本打下来；不会用的，还在被“回料=次品”的偏见挡在门外，这笔账早晚会算明白，早动手的人早省钱。
采购时再送你一个实用动作：头一回合作，别上来就整吨拿。先要几公斤样料上机跑半天，把晶点、黑点、水分都验过，再谈批量。再生PE的猫腻往往不在单批指标，而在两批之间——这一批干净，下一批可能就掺了杂。把验收范围写进合同、每批随货带检测数据，比任何口头保证都管用。这一步看着慢，却能帮你把后面半年的麻烦一次清掉。
再生PE从来不是“便宜的代名词”，它是一门把对的料放进对的工艺里的手艺，手艺到家了，成本和良率才会同时站在你这边。
再生PE用对地方，省的不止料价
宁波市科隆新材料有限公司长期供应再生PE聚乙烯原料，覆盖HDPE、LDPE、LLDPE多等级，应用于吹膜、管材、托盘、瓶盖、中空制品等场景。HDPE和LDPE再生后怎么选？膜料和注塑料等级差在哪？
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，文中涉及的具体等级、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。
New material sells for seven thousand, recycled material sells for five thousand, yet the experienced workers in the film-blowing workshop just shake their heads at that cheap bag—the moment the material goes into the machine, the film bubbles, there are many crystal points, and the rolls come out brittle. The same ton of material, taken by the neighboring factory, works perfectly for making pallets, but in his hands, it turns into a pile of scrap. The difference isn't in the material; it's that he simply hasn't figured out which types in the recycled PE family are equivalent to each other.
Let's spend two minutes getting to know the main character. Ningbo Kolon New Materials Co., Ltd. is a plastic raw material supplier integrating both industry and trade. Recycled PE (polyethylene) is a common category, with multiple grades of HDPE, LDPE, and LLDPE available. Polyethylene is one of the most widely produced types among general-purpose plastics. The cling film, vest bags, plastic buckets, water pipes, and turnover pallets you see every day are all made of it. The sources of recycled PE come from two channels: industrial packaging film scraps and sprue materials from pelletizing plants, which are clean and easy to handle; and the other channel is recycled agricultural film, chemical drums, motor oil bottles, daily chemical bottles, and pipes, which need to be washed, crushed, and pelletized. The technical basis is GB/T 40006.2-2021 "Plastics—Recycled Plastics—Part 2: Polyethylene (PE) Materials," which classifies recycled PE by density into low-density, high-density (HDPE), and filled/mixed types, with clear requirements for ash content, moisture, density deviation, and MFR variation coefficient. This article explains in one go the distinction between high- and low-pressure recycled PE, how to choose films, pipes, and pallets, and how to calculate the accounts.
Hearing 'recycled material' makes people shake their heads; it's mostly because they were scared by the previous generation of recycled materials.
Many people's bad impression of recycled PE comes from the early type of pellets that were black, mixed with calcium carbonate, and would break with a pull. Such material did exist, but it was 'homemade recycled material' without sorting or cleaning, which is not the same as today’s compliant recycled PE managed according to GB/T 40006.2. The standard classifies recycled PE according to density: those with a density not exceeding 0.940 are classified as low-density types (LDPE, LLDPE, MDPE), those exceeding 0.940 are classified as high-density HDPE types, and there is also a type that allows fillers and higher ash content mixtures.
Many bosses frown as soon as they hear 'recycled material,' and what they fear in their hearts is usually just a few things: fear of impurities, fear that each batch is inconsistent, fear that it won't pass customer factory inspections. These concerns are exactly what standards and reputable suppliers are meant to address. Standards list out the ash content, moisture, density, and MFR coefficient of variation so that you have something to reference; reputable suppliers provide test data for each batch so that you can present it during factory inspections. These worries won't disappear just because you use or don't use recycled material—they only vary depending on whether you choose the right supply channel. If the channel is chosen correctly, recycled material can also take center stage.
The hard indicators in the standard are obvious to outsiders at a glance: under the 600°C ash method, ordinary recycled PE is required to have ash content no more than 2%, and mixed types with fillers are allowed up to 5%; moisture content must not exceed 0.2%; MFR should report the measured value, and the coefficient of variation must be controlled. For key properties like tensile strength, recycled PE is allowed to be lower than virgin material, but it must be stable. In other words: the state allows recycled PE to have reduced performance, but it does not allow varying reductions from batch to batch.
This is why some people made money using recycled PE, while others ended up failing. The one who failed used low-grade HDPE from pallet production for film blowing, which is like asking a truck driver to drive a race car—the material itself wasn't bad, it was just put on the wrong track. Film blowing plants need film-grade materials that are flowable, easy to open, and have few crystalline points; pallet factories need structural materials that are rigid, impact-resistant, and cheap. The requirements for the materials are completely different for the two.
Recycled PE is not shameful; only being in the wrong track is shameful — a film is not a tray, and a tray can't replace a film.
Adding another layer of context: why are the film, pipe, and pallet industries all rushing to use recycled PE? Because they have low requirements for appearance, large usage volume, and stable recycling channels. The liner films used by film factories are packaging consumables that are discarded after use, so making them into recycled material and returning them to the production line creates a short closed loop. Pipes and pallets rely on structural performance, so being a bit darker in color or rougher on the surface doesn't affect their use. Hollow daily chemical bottles are even larger in volume and widespread; motor oil bottles and laundry detergent bottles pile up in recycling stations, and once sorted, they become good raw materials. With strong demand and supply on both ends, recycled PE naturally becomes one of the main varieties of recycled plastics in terms of volume.
Figure 1 Regenerated PE Blown Film and Hopper Feeding Scene (Schematic)
In the world of PE, there are high and low pressures; HDPE and LDPE are two temperaments.
Before talking about recycled PE, let's first translate the jargon of high and low pressure. In the industry, 'high-pressure material' refers to LDPE, low-density polyethylene, which has low crystallinity, a soft feel, good film gloss, and excellent heat-sealing properties. It is indispensable for making T-shirt bags and packaging films. 'Low-pressure material' refers to HDPE, high-density polyethylene, with well-ordered molecular arrangement, strong rigidity, high tensile strength, and puncture resistance, making it more suitable for pipes, hollow containers, and pallets. LLDPE linear material falls in between, has good toughness, and is often mixed with LDPE when blowing films, with common ratios adjusted according to the weight of the packaging.
Recycled PE turns from waste into pellets and follows the path of sorting, crushing, washing, and pelletizing, but PE has its own difficulty: film materials are thin, carry dirt and sand, and have printing ink, while agricultural films are prone to carry soil, making the cleaning cost much higher than rigid materials. Hard materials like chemical barrels and engine oil bottles have high density, are easy to clean, and have good rigidity, making recycled HDPE a main material for pallets and hollow products; clean industrial packaging films are the source for blown film-grade recycled material. According to their origin and use, the commonly seen grades of recycled PE on the market are roughly as follows (the indicators are general industry ranges and specific standards should refer to GB/T 40006.2 and the manufacturer's TDS):
| Level Name | Typical source | Key indicators | Typical uses |
|---|
| Blown film grade recycled LDPE/LLDPE | Industrial packaging film, film scraps | Low MFR, few crystal points, good openness | Liner bags, light packaging films, shrink films |
| Injection molding grade recycled HDPE | Chemical drums, turnover boxes, turnover pallets | Moderate MFR, relatively good rigidity | Trays, tray covers, daily necessities |
| Pipe-grade recycled HDPE | Old water pipes, corrugated pipes | Low melt index, resistant to environmental stress cracking | Corrugated pipe, non-pressure drainage pipe |
| Hollow blow molding grade recycled HDPE | Engine oil container, daily chemical bottles | Low MFR, drop-resistant | Non-food daily chemical bottles and barrels |
| Natural Light-Colored Recycled PE | Clean film, packaging scraps | Few impurities, can be color-matched | Color film, modified base material |
| Black filled recycled PE | Mixed-color film, mixed recycling | High ash content, low price | Pallets, cable conduits, spacers |
Market Reference: Recently, the mainstream quotations for white, transparent, first-grade recycled LDPE film-grade pellets in the market are around over 6,000 yuan per ton. White first-grade recycled HDPE for injection molding and film-grade are in a similar range. Black or filled grades are cheaper, generally over 5,000 yuan per ton. When Ningbo Kolon New Materials Co., Ltd. quotes for PE materials, they usually first ask whether the downstream application is film, pipe, hollow, or injection molding, and then adjust the grade according to the use — because in the PE business, knowing the correct process is key to quoting the right price.
One more point about PE recycling: PE molecular chains degrade after multiple heating cycles, the MFR tends to rise, and the material becomes brittle. Therefore, when recycling film-grade materials, the extrusion process usually needs to be readjusted, and if necessary, a bit of processing aid is added to stabilize flow. This is also why recycled film-grade material is expensive — it needs to be cleaned thoroughly and the degradation must be controlled. On the other hand, items like trays and pads are not sensitive to slight changes in MFR and can tolerate mechanical property decline, so using cheap black filled material is quite suitable. In short: the closer the material is to the process it was originally designed for, the better it is to use after recycling; for cross-purpose applications, it needs to be reconditioned.
What is saved is not just the material cost, but also the stability of the entire production line.
The accounts for recycled PE are easier to miscalculate than for recycled PP because its process variations are so large: for blown film, you check if the bubbles are stable and if there are many crystal spots; for extrusion tubing, you see if the surface is smooth and if the thickness is uniform; for hollow molding, you check if there will be bubbles during blow molding and if it will crack when dropped. If the wrong material is chosen, the little money saved on the material will all be lost on machine adjustments and waste. To break it down:
| Cost item | Brand new PE material | Recycled PE | Difference Explanation |
|---|
| Raw material purchase price | Benchmark price | Around a few thousand yuan per ton | The spread for film-grade is narrow, while the spread for black-filled is wide |
| Process yield | Stable | Depends on level matching | Film-level crystal points and tube-level surfaces are key |
| Appearance Color | consistent | The natural color may need to be matched | For light-colored films, choose white transparent material |
| Mechanical properties | Stable | HDPE is rigid, LDPE is soft | Mixing high and low pressure requires a set ratio |
| Scrap rework | few | Concentrated outbreak due to choosing the wrong level | First try a small test to determine the mixing ratio |
| Full-year comprehensive | superficially expensive | Buying large quantities of big items is more cost-effective | Food contact films are also subject to compliance restrictions |
Boundary List — When to Keep in Mind, When to Hold Back:
Use with confidence: trays, shims, cable conduits, non-pressure drainage pipes, black or color-matching hollow parts.
Use with caution: For packaging blown film, first select high-grade white transparent film material, check the specks and openness, and increase the quantity only after a small trial.
First verify: hollow chemical drums and containers, test for drop resistance and dimensional stability; for high and low pressure blends, test with film bubbles first.
Do not touch: food directly contacting the packaging film without compliance basis; high-transparency, high-end packaging film; blown film from mixed, unknown sources.
Procurement actions: For film-grade materials, look at the crystallization point and ash content; for pipe-grade materials, look at the melt index and ash content. Don’t just ask, 'How much per ton?'
By the way, let's thoroughly explain the high- and low-pressure blending experience in film blowing: using only LDPE makes the film soft but it can't hold up or stand; using only HDPE makes the film hard but brittle, prone to cracking. So conventional vest bags and light packaging films usually blend LDPE with LLDPE according to a certain ratio, while heavy-duty industrial films increase the HDPE proportion. When recycled material comes to you, don't expect to directly replace a certain type of virgin material. Instead, follow your original blending ratio and find the corresponding grade of recycled material to substitute—for example, if your original blend is LDPE to LLDPE at 70:30, then with recycled material, find the corresponding two grades, keep the blending ratio unchanged initially, and only fine-tune after the film becomes stable. This way, cost reduction is minimal and risks are controllable.
Cologne New Materials' film material debugging: only when the blending ratio is correct, the film won't curl.
To make the point easier to explain, the following demonstration uses a typical scenario that has been adapted and is not a record of a real order. A small factory in Ningbo that produces industrial liner films wanted to reduce costs, so it directly purchased a batch of cheap black recycled PE. Problems arose as soon as production started: the film bubbles were unstable, wrinkles appeared during rolling, and crystalline spots were scattered, resulting in a high defective rate. The owner almost gave up on using recycled materials.
Later, they got in touch with Ningbo Kelon New Materials Co., Ltd. After looking at the film specifications, Kelon New Materials first rejected the black material — the inner liner film needs to be light-colored with few crystal points, and black filler is inherently unsuitable for film blowing. Their suggestion was: use white transparent primary recycled LDPE as the main material, add a small portion of LLDPE recycled material to adjust toughness, with the blending ratio tested according to film thickness and packaging weight; first do small-scale lab tests by blowing a few rolls, and once the film bubbles are stable and the crystal points pass inspection, proceed to batch production. Once the process ran smoothly, the material supply was secured, the defective rate fell from double digits at its peak to normal levels, and the rolled film came out flat without curling.
The lesson illustrated by this scenario is very simple: reducing costs with recycled PE is not about 'finding the cheapest material,' but about 'finding material that can run stably on your production line.' Ningbo Kolon New Materials Co., Ltd. supplies PE by putting effort into the preparation stage—first asking about the process, then determining the grade, and finally discussing the price. The order is exactly the same as when selecting PP.
Reviewing this case, Kolon New Material summed it up in one sentence: for film blowing using recycled material, the clarity of the material is more important than the color, and the presence of crystal spots is more important than the price. The reason why white transparent first-grade material is expensive is that it is thoroughly cleaned, finely screened, and has few black spots, so the blown film is clear; if you go for cheap black material mixed with calcium powder, whatever you blow will be worthless. Later, this factory applied this approach to thick inner lining bags, steadily increasing the proportion of recycled material, and even during peak season, machines never stopped due to material issues.
You think you are saving on material costs, but in fact, you are leaving the crystal defects, blisters, and rework for yourself—the wrong grade means every penny saved has to be paid back double.
For selecting recycled PE, first consider the density, then look at the application.
Condense common applications into a quick reference table and check them off before placing an order:
| Application scenario | Recommendation Level | Precautions | When not to use |
|---|
| Liner film, lightweight packaging film | White Transparent Recycled LDPE/LLDPE Film Grade | Observe crystal points and openness | Food direct contact films must pass compliance first |
| Pallets, shims | Recycled HDPE Injection Molding Grade / Black Filled Grade | Check rigidity and ash content | High-load outdoor parts are tested for impact first |
| corrugated pipe, drainage pipe | Pipe-grade recycled HDPE | Observe the molten finger and surface | Do not use for pressurized drinking water pipes |
| Daily chemical bottles and barrels | Hollow blow molding grade recycled HDPE | Drop resistance test | Food-grade containers to be discussed separately |
| Modified base material | Natural Light-Colored Recycled PE | Determine Color Matching and Mixing Ratio | Do not mix with high-transparency optical components |
Three sentences to wrap up: First, clearly identify whether the material in your hands is HDPE or LDPE; then, figure out whether your process is film blowing, pipe extrusion, or hollow molding; only after that should you talk about price. If the order is reversed, the film bubbles wobble, pipes bend, barrels crack, and the money saved on materials won’t even cover the machine repairs. The industry is moving towards a circular economy, and policies are promoting the graded use of recycled materials. Factories that know how to use recycled PE have quietly been reducing costs in recent years; those that don’t, are still blocked at the door by the prejudice that "recycled material = inferior product." This account will be settled sooner or later, and those who act early save money.
Here’s a practical tip for you when purchasing: for the first-time cooperation, don’t start by buying tons. First, take a few kilograms of sample material and run it on the machine for half a day, checking for crystal points, black spots, and moisture, before discussing bulk orders. The trick with recycled PE often isn’t in the specifications of a single batch, but between batches—the current batch may be clean, but the next one could be mixed with impurities. Include the inspection criteria in the contract, and send testing data with each batch; this is more effective than any verbal guarantee. This step may seem slow, but it can help you eliminate half a year’s worth of trouble all at once.
Recycled PE has never been a 'synonym for cheap'; it is a craft of putting the right material into the right process. When the craft is mastered, both cost and yield will be on your side.
Using recycled PE in the right places saves more than just the material cost.
Ningbo Kolon New Materials Co., Ltd. has been supplying recycled PE polyethylene raw materials for a long time, covering multiple grades of HDPE, LDPE, and LLDPE, and is applied in film blowing, pipes, pallets, bottle caps, hollow products, and other scenarios. How to choose between recycled HDPE and LDPE? What are the differences between film-grade and injection-molding-grade materials?
Disclaimer: The brands and trademarks mentioned in this article are owned by their respective manufacturers. This article is a third-party material selection knowledge sharing, and the specific grades, parameters, prices, certifications, and other information mentioned herein are subject to the latest official information from each manufacturer. This article does not constitute any procurement or investment advice.
