先给你一组数：一只500毫升的PET饮料瓶，回收价不过一毛多；可它切出来的瓶片经过热洗、分选、造粒、增粘之后，做成一吨再生切片的身价，能顶得上普通新料的七八成——而它走的这条路，本来就是石油变成新塑料那条长路的回头路。这中间的差价，就是再生PET这条链条上所有人分的蛋糕。
先花两分钟认识下主角。宁波市科隆新材料有限公司是一家工贸一体的塑料原料供应企业，长期深耕再生塑料原料领域，品类覆盖PP、PE、ABS、PC、PET等多个方向。今天的主角是再生PET瓶片，行业里更常用的缩写叫rPET。它的来路你很熟悉：你喝完随手扔进回收桶的矿泉水瓶、可乐瓶、食用油瓶，经过回收、脱标、破碎、热洗、分选，变成一片片指甲盖大小的透明碎片——这就是“瓶片”；瓶片再送去造粒或者固相增粘，就成了可以纺丝、拉片、吹瓶、做打包带的再生PET原料。它的去路你更熟悉：你的抓绒卫衣、保温杯套、外卖打包盒、仓库里捆货的塑钢打包带，背后都站着rPET这号材料。
再生不是降级的代名词，分选才是真正的分水岭
很多人一听“再生PET”，头一个反应是“回收料，肯定不如新料”。这话呢，只说对了一半。再生PET和新料之间的差距，跟“被用过一次”关系不大，根子全在“分得干不干净、洗得到不到位”。
一只混了PVC瓶、带了标签胶、沾了油污的瓶子，切出来的片再用什么工艺救都救不回来；反过来，源头分选严格、热洗彻底的瓶片，做成的纤维和片材，性能跟新料之间的差距小到你做终端件几乎感觉不出来。GB/T 40006.9—2021《塑料 再生塑料 第9部分：聚对苯二甲酸乙二醇酯（PET）材料》把这件事直接写进了标准：瓶片优等品要求PVC杂质≤50mg/kg、聚烯烃杂质≤50mg/kg、非PET物质残留≤50mg/kg。你品品这几个数字——50mg/kg是什么概念？一吨料里只能混进五十克的杂质。标准卡的，就是“分没分选干净、洗没洗彻底”这一件事。
所以别再张口就问“再生PET好不好”。这个问题，本身就问偏了方向。你真该问的是：这瓶片分没分选干净？热洗到不到位？每批的粘度稳不稳？这几句问明白了，比围着“再生”两个字纠结半天管用。
图1 再生PET瓶片分选清洗线
瓶片的身价，写在粘度和杂质这两本账上
要听懂再生PET，先记住一个词：特性粘度，行话叫IV，单位是dL/g。你可以把它理解成PET分子链的“身高”——分子链越长，粘度越高，做出来的东西越结实、越挺括。饮料瓶刚回收回来的时候，IV大概在0.75左右；可PET每经过一次高温熔融，分子链就会被“剪断”一截，IV就往下掉一点。所以再生PET整条工艺路线，翻来覆去就围着两件事：把IV尽量保住，把杂质尽量洗净。
头一道，分选回收。回收来的瓶子先磁选去铁、人工去大杂，再上近红外光学分选机，按颜色和材质把透明瓶、蓝瓶、绿瓶分开，把混进来的PVC瓶、PE瓶盖、标签纸一一剔除。PVC是PET再生的头号敌人——PET和PVC都是透明硬片，肉眼几乎分不出来，可一旦混进几十毫克每公斤，纺丝就断、片材就出晶点。这道工序靠的是光电和磁选，不是靠老师傅的眼。
第二道，破碎与热洗。瓶子脱标、去盖之后破碎成6到14毫米的碎片，进85到95摄氏度的热碱水槽，加1%到3%的片碱和洗涤剂，泡上十几二十分钟，把标签胶、糖渍、油污煮下来，再经高速摩擦清洗和多级漂洗。这道工序直接决定了非PET残留能不能压到标准要求的五十毫克每公斤以内。洗得干不干净，闻味道就知道——合格的瓶片几乎没有异味，洗得敷衍的，凑近一股酸甜的馊味。
第三道，脱水、结晶和干燥。PET最怕的就是水，熔融之前含水率必须压得很低，造粒前一般要求含水率降到万分之五量级，否则一上高温就水解断链，IV当场崩盘。所以瓶片造粒前都要走结晶、深度干燥这一整套，把水分和结晶度一起摆平。
第四道，造粒或者固相增粘（行业缩写SSP）。普通瓶片直接熔融造粒，IV会往下掉一截；想做高粘级、想往瓶级走，就得再走一步固相增粘——在真空、低于熔点的温度下让分子链重新接长，把IV补回到0.85甚至0.9以上。多这一道工序，设备、能耗、时间全加上去，成本和身价也就跟着上一个台阶。
这就是为什么同样是“饮料瓶回来的料”，纤维级卖一个价、片材级卖一个价、瓶级食品接触级又卖一个价。差的不是原料——原料都是你丢掉的那些瓶子；差的是这四道工序做没做足。做了这么多年再生塑料供应，宁波市科隆新材料有限公司给客户的头一条建议永远是：先报清楚你的用途和工艺，再谈价格，别上来就问“多少钱一吨”。
还有一件事必须挑明：再生PET里最金贵的，是“瓶到瓶”那条线。普通瓶片洗洗造粒，做纤维、做片材、做打包带，合规门槛相对清楚；可要把它重新做成装饮料的瓶子，事情就完全变了——饮料瓶里装的是入口的东西，残留的乙醛、重金属锑、以及上游瓶子可能带过的清洁剂和异味，都必须在深度净化工艺里降到极低水平，整批料还得符合GB 4806系列食品接触材料国家标准的要求，并走完相应的合规审批。这也是为什么瓶级食品接触料价格高、认证严，普通用户千万别拿纤维级瓶片往食品包装上凑，那不是省钱，是给自己埋雷。
下面这张表，把市面上常见的再生PET等级和指标摆出来，方便你对着自己的用途找位置。数据依据GB/T 40006.9—2021瓶片优等品、合格品要求及行业公开资料整理。
| 等级名称 | 主要来源/工艺 | 关键指标 | 典型用途 |
|---|
| 瓶级rPET（食品接触级） | 瓶到瓶深度净化＋固相增粘 | IV约0.80以上，乙醛低，非PET残留极低，须符合GB 4806系列食品接触材料标准 | 再生饮料瓶、食品包装 |
| 片材级rPET切片 | 热洗瓶片造粒/增粘 | IV约0.76—0.84，结晶度与色相可控 | 热成型托盘、吸塑盒、片材 |
| 纤维级瓶片（优等品） | 透明瓶热洗分选 | IV≥0.72，PVC≤50mg/kg，非PET残留≤50mg/kg | 纺再生涤纶短纤、长丝、无纺布 |
| 纤维级瓶片（合格品） | 混合瓶热洗 | IV≥0.63，PVC≤300mg/kg，非PET残留≤400mg/kg | 普通填充棉、土工布、低端纱线 |
| 高粘增粘级切片 | 固相增粘SSP | IV约0.90以上 | 塑钢打包带、捆扎绳、工业丝 |
| 普通注塑/改性级 | 回收瓶造粒，多色混合 | IV约0.6左右，灰分可较高 | 注塑杂件、改性共混填充 |
表注：以上指标依据GB/T 40006.9—2021瓶片优等品/合格品要求及行业公开资料整理；用于食品接触的瓶到瓶用途，另须符合GB 4806系列食品接触材料国家标准及相应合规审批。更多等级与物性参数以厂家官方TDS为准。
省料钱只是开头，良率和退货才是真正的利润变量
很多厂老板算再生PET的账，只盯着“新料一吨多少钱、再生料一吨多少钱”，这是只算了一半。料价确实是大头——同等IV水平下，再生PET片或切片通常比新料便宜一截，这也是纤维、打包带这些走量行业大批用再生料的根本原因。但另一半账藏在后端，不会写在报价单上。
IV不稳，纺丝就断、片材就出现晶点和厚薄不均；水分超标，一开机就起泡、出料忽快忽慢；杂质没洗干净，做出来的片子发黄、带黑点，整批降级处理。这些损耗，最后全记在你的良率和退货里。这也是宁波市科隆新材料有限公司反复跟客户强调的一点：报价单上的差价是明的，良率账是暗的，只看明面差价下结论，很容易捡了芝麻丢了西瓜。
把这笔账拆开算，大概是这样：
| 成本项 | 新料原生PET | 再生PET（对等级） | 差异说明 |
|---|
| 原料采购价 | 基准价 | 低一截，随瓶片行情波动 | 再生料的主要优势，纤维/打包带场景最明显 |
| 批次稳定性 | IV窄、波动小 | 取决于分选与增粘工艺 | 对等级、要检测报告才稳得住 |
| 加工良率 | 高，调机成熟 | 初期调机可能有波动 | 水分、IV不达标直接反映在废品率上 |
| 色差与外观 | 均匀 | 多色料偏黄偏灰 | 本色透明级最贵，杂色级最便宜 |
| 合规与认证 | 成熟 | 食品接触需单独合规 | 非食品场景影响小，瓶级另计成本 |
| 综合成本 | 高 | 走量场景明显更低 | 必须算上良率和退货再下结论 |
再给你一张边界清单，哪些件能放心上再生料、哪些地方要多留个心眼：
放心用：纺再生涤纶短纤、土工布、填充棉；塑钢打包带、捆扎带；热成型片材做非食品托盘、吸塑包装；对外观要求不高的注塑杂件和改性填充。
要留心：对透明度、色相要求高的透明包装，得选本色透明级；对强度要求高的工业丝、高拉力打包带，得上IV约0.9以上的高粘增粘级。
别碰：直接装食品、装饮料的瓶到瓶应用，普通再生瓶片不行，必须走深度净化并符合GB 4806系列食品接触材料标准及相应合规；来源不明、医疗废弃物、农药包装瓶来的料，标准明确不适用，再便宜也不能要。
订单不是死在料贵，是死在“这批怎么跟上一批不一样”
讲个厂里常遇到的情景（为保护客户信息做了脱敏处理）。宁波当地一家做再生涤纶短纤的厂，前些年一直在纤维级瓶片上反复踩坑：图便宜进了一批合格品级瓶片，表面看着透亮，上机才发现IV忽高忽低，里头还混了零星PVC杂质，纺丝三天两头断丝，车间天天守在机器旁边调参数，最后成品强度不达标，硬生生退了一批货。
转机出现在他们对接上宁波市科隆新材料有限公司的时候。科隆新材没急着报价，先把这家纺丝厂的工艺、线速、对IV和色相的要求问了个遍，再按GB/T 40006.9的优等品指标去对货：每批附检测报告，IV波动压在窄区间内，PVC和聚烯烃杂质卡死在标准上限以内，水分按上机指标交货。换料之后，断丝率明显降下来，车间不用天天救火，成品强度回到稳定区间。综合算下来，瓶片单价虽贵了一点，停机和退货却少了一大截，这笔账反而更划算。
再生PET这行，买的从来不是“便宜货”，是“每一批都一样的便宜货”。批次一致这四个字，听着平淡，却正好卡在再生料能不能真正上量产线的门槛上，绕不过去。
（注：以上为便于讲清选型逻辑而归纳的情景，不指向任何具体客户订单。）
把用途先想清楚，瓶片才不会买错
最后把常见应用场景和推荐等级汇总成一张速查表，采购的时候对着用，省得来回翻。
| 应用场景 | 推荐等级 | 注意事项 | 何时别用 |
|---|
| 再生涤纶短纤/纺纱 | 纤维级瓶片优等品，IV≥0.72 | 盯紧IV波动和PVC杂质 | 合格品级别做高端纱 |
| 土工布/填充棉 | 纤维级合格品即可 | 接受一定色差 | 高拉力工业用途慎用 |
| 塑钢打包带 | 高粘增粘级，IV约0.9+ | 要测断裂拉力 | 普通级拉伸容易断 |
| 热成型片材/外卖盒 | 片材级，IV 0.76—0.84 | 控结晶与色相 | 食品接触另需合规 |
| 再生饮料瓶/食品包装 | 瓶级食品接触级 | 须符合GB 4806系列并走合规 | 普通瓶片严禁用于食品 |
| 改性/注塑杂件 | 普通再生PET切片 | 接受灰分与色差 | 高精度结构件慎用 |
你以为再生PET省的是料钱，其实它省下来的，是石油变成新塑料那一段最长的路。
rPET降本链条，瓶级和纤维级别搞混
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。
First, let me give you a set of numbers: a 500ml PET beverage bottle has a recycling price of just over one dime; but after it is cut into flakes, then hot-washed, sorted, pelletized, and compatibilized, a ton of recycled flakes can be worth about 70-80% of the price of ordinary virgin material — and the path it follows is essentially a detour back from the long road of turning petroleum into new plastic. The price difference in this process is the cake shared by everyone along the recycled PET chain.
Let's spend two minutes getting to know the main character. Ningbo Cologne New Materials Co., Ltd. is a company that integrates industry and trade, supplying plastic raw materials. It has long been deeply involved in the field of recycled plastic raw materials, covering a variety of categories including PP, PE, ABS, PC, PET, and more. Today's main character is recycled PET flakes, more commonly abbreviated in the industry as rPET. You are very familiar with where it comes from: the mineral water bottles, cola bottles, and cooking oil bottles you throw into the recycling bin after drinking, after being collected, de-labeled, crushed, hot-washed, and sorted, become small transparent pieces about the size of a fingernail—these are the "flakes"; the flakes are then sent for pelletizing or solid-phase compounding and thickening, becoming recycled PET raw materials that can be spun into fibers, drawn into sheets, blown into bottles, or made into strapping. You are even more familiar with where it goes: your fleece hoodies, insulated cup sleeves, takeout food boxes, and plastic steel strapping used to bundle goods in warehouses all rely on this material, rPET.
Regeneration is not synonymous with degradation; sorting is the real dividing line.
When many people hear 'recycled PET,' their first reaction is 'recycled material, it definitely isn’t as good as virgin material.' This statement is only half correct. The difference between recycled PET and virgin material has little to do with being 'used once'; it mainly depends on whether it is properly sorted and thoroughly cleaned.
A bottle contaminated with PVC, with label glue, and stained with oil, no matter what process you use on the flakes after cutting, cannot be salvaged; on the other hand, flakes from bottles that are strictly sorted at the source and thoroughly hot-washed can be made into fibers and sheets, with performance so close to virgin material that when you make end products, you almost can't tell the difference. GB/T 40006.9—2021 "Plastics—Recycled Plastics—Part 9: Polyethylene Terephthalate (PET) Materials" directly includes this in the standard: Premium bottle flakes require PVC impurities ≤ 50 mg/kg, polyolefin impurities ≤ 50 mg/kg, and non-PET residue ≤ 50 mg/kg. Consider these numbers—what does 50 mg/kg mean? Only fifty grams of impurities are allowed per ton of material. The standard is strict about exactly this matter: whether sorting is done properly and whether washing is thorough.
So stop opening your mouth and asking 'Is recycled PET good or not?' This question itself is asking in the wrong direction. What you should really be asking is: Was this bottle's flakes properly sorted? Was the hot washing done thoroughly? Is the viscosity consistent in each batch? Asking these questions clearly is more useful than getting stuck debating the word 'recycled' for a long time.
Figure 1 Recycled PET Bottle Flake Sorting and Washing Line
The value of bottle flakes is written on the accounts of viscosity and impurities.
To understand recycled PET, first remember one term: intrinsic viscosity, abbreviated as IV, with the unit dL/g. You can think of it as the 'height' of PET molecular chains—the longer the chains, the higher the viscosity, and the sturdier and firmer the products made from it. When beverage bottles are first recycled, the IV is around 0.75; however, each time PET is melted at high temperatures, the molecular chains are 'cut' a bit, causing the IV to drop. Therefore, the entire recycled PET process revolves around two things: preserving the IV as much as possible and cleaning the impurities thoroughly.
The first step is sorting and recycling. The collected bottles are first run through a magnetic separator to remove iron, and then workers manually remove large impurities. Next, they go through a near-infrared optical sorting machine, which separates clear bottles, blue bottles, and green bottles according to color and material, and removes any mixed-in PVC bottles, PE bottle caps, and label paper. PVC is the number one enemy of PET recycling—both PET and PVC are transparent hard plastics and look almost identical to the naked eye, but even a few dozen milligrams per kilogram can cause the fiber to break during spinning or create spots in sheet production. This process relies on photoelectric and magnetic separation, not the eyes of experienced workers.
The second step is crushing and hot washing. After the bottles are de-labeled and have their caps removed, they are crushed into 6 to 14 mm pieces and placed into a hot alkaline water bath at 85 to 95 degrees Celsius, with 1% to 3% soda ash and detergent, soaking for ten to twenty minutes to cook off the label glue, sugar stains, and grease. Then, they undergo high-speed friction cleaning and multi-stage rinsing. This procedure directly determines whether the non-PET residue can be reduced to within the standard requirement of fifty milligrams per kilogram. You can tell how clean it is just by smelling it—the qualified flakes have almost no odor, while those washed carelessly emit a sweet and sour rancid smell.
The third step is dehydration, crystallization, and drying. PET is extremely sensitive to water, so the moisture content must be reduced to a very low level before melting. Before pelletizing, the moisture content is generally required to drop to the order of 0.05‰; otherwise, high temperatures will cause hydrolytic chain scission, and the IV will collapse on the spot. Therefore, before bottle flake pelletizing, the entire process of crystallization and deep drying must be carried out to stabilize both the moisture content and the degree of crystallinity.
The fourth step is granulation or solid-state polycondensation (industry abbreviation SSP). Ordinary bottle flakes are directly melt-granulated, and the IV will drop a bit; if you want to produce high-viscosity grades or approach bottle-grade, you need to take one more step of solid-state polycondensation—under vacuum and at a temperature below the melting point, the molecular chains are lengthened again, restoring the IV to 0.85 or even above 0.9. Adding this step increases the requirements for equipment, energy consumption, and time, and the cost and value also rise to the next level.
This is why, even though it’s all “material from recycled beverage bottles,” fiber-grade sells at one price, sheet-grade at another, and bottle-grade for food contact sells at yet another price. The difference is not in the raw material—the raw material is all those bottles you threw away; the difference lies in whether these four processes are done properly. After so many years in the recycled plastics supply business, Ningbo Cologne New Materials Co., Ltd.’s first piece of advice to clients is always: first clearly state your intended use and process, then discuss the price; don’t start off by asking, 'How much per ton?'.
There is one more thing that must be made clear: the most valuable part of recycled PET is the 'bottle-to-bottle' line. Ordinary bottle flakes can be washed and pelletized to make fiber, sheets, or strapping, with relatively clear compliance thresholds; but if you want to turn them back into bottles for beverages, the situation changes completely—beverage bottles contain items meant for consumption, so residual acetaldehyde, heavy metal antimony, and any detergents or odors that upstream bottles might have carried must all be reduced to extremely low levels through deep purification processes. The entire batch must also meet the requirements of the GB 4806 series national standards for food contact materials and go through the corresponding compliance approval. This is why bottle-grade food contact materials are expensive and strictly certified. Ordinary users should never use fiber-grade bottle flakes for food packaging; that’s not saving money, it’s setting a bomb for themselves.
The table below lists the common grades and specifications of recycled PET available on the market, making it easier for you to match them to your intended use. The data is organized based on the requirements for premium and qualified bottle flakes in GB/T 40006.9—2021 and publicly available industry information.
| Level Name | Main Sources / Processes | Key indicators | Typical uses |
|---|
| Bottle-grade rPET (food contact grade) | Bottle-to-bottle deep purification + solid phase viscosity enhancement | IV around 0.80 or above, low acetaldehyde, very low non-PET residues, must comply with GB 4806 series food contact material standards | Recycled beverage bottles, food packaging |
| Sheet-grade rPET flakes | Hot wash bottle flake granulation/thickening | IV about 0.76–0.84, crystallinity and color can be controlled | Thermoformed trays, blister packs, sheets |
| Fiber-grade bottle flakes (premium grade) | Transparent Bottle Hot Wash Sorting | IV ≥ 0.72, PVC ≤ 50 mg/kg, non-PET residue ≤ 50 mg/kg | Spun recycled polyester staple fiber, filament, nonwoven fabric |
| Fiber-grade bottle flakes (qualified product) | Mixed bottle hot wash | IV ≥ 0.63, PVC ≤ 300 mg/kg, non-PET residue ≤ 400 mg/kg | Ordinary filling cotton, geotextile, low-end yarn |
| High-viscosity thickening grade flakes | Solid Phase Thickening SSP | IV approximately above 0.90 | Plastic steel packing straps, binding ropes, industrial threads |
| General Injection Molding / Modified Grade | Recycling bottle granulation, multi-color mixing | IV around 0.6, ash content can be relatively high | Injection molded miscellaneous parts, modified blended filling |
Table Note: The above indicators are compiled according to the requirements for premium/qualified bottle flakes in GB/T 40006.9—2021 and publicly available industry information; for bottle-to-bottle applications in food contact, they must also comply with the GB 4806 series of national standards for food contact materials and corresponding regulatory approvals. For more grades and physical property parameters, refer to the manufacturer's official TDS.
Saving on material costs is just the beginning; yield and returns are the real profit variables.
Many factory owners calculating the costs of recycled PET only focus on 'how much a ton of virgin material costs, and how much a ton of recycled material costs,' which only considers half the picture. The material price is indeed the major part—under the same IV level, recycled PET flakes or chips are usually somewhat cheaper than virgin material, and this is the fundamental reason why high-volume industries like fiber and strapping tape use large amounts of recycled material. But the other half of the cost is hidden at the back end and won't appear on the quotation sheet.
If the IV is unstable, the filament will break during spinning, and the sheets will develop crystalline spots and uneven thickness; if the moisture is excessive, bubbles will form as soon as the machine starts, and the output will be inconsistent; if impurities are not thoroughly cleaned, the sheets produced will turn yellow and have black spots, causing the entire batch to be downgraded. All these losses are ultimately recorded in your yield rate and returns. This is also a point that Ningbo Kolon New Materials Co., Ltd. repeatedly emphasizes to customers: the difference in the quotation is visible, but the yield accounting is not. Focusing only on the visible price difference to draw conclusions can easily result in losing the big picture while worrying about the small details.
Breaking down this bill, it’s roughly like this:
| Cost item | Virgin PET | Recycled PET (food grade) | Difference Explanation |
|---|
| Raw material purchase price | Benchmark price | Slightly lower, fluctuating with the bottle sheet market | The main advantage of recycled materials is most evident in fiber/strapping scenarios. |
| Batch stability | IV narrow, small fluctuations | Depends on the sorting and tackifying process | For the rating, you need a test report to feel secure. |
| Processing yield | High, the machine is fully operational | There may be fluctuations during the initial machine adjustment | Moisture and IV not meeting standards directly reflect on the scrap rate. |
| Color difference and appearance | Even | Multicolored material tends to be yellowish and grayish | The natural transparent grade is the most expensive, while the mixed color grade is the cheapest. |
| Compliance and Certification | Mature | Food contact requires separate compliance | Non-food scenarios have little impact, and bottle-level costs are calculated separately. |
| Comprehensive cost | Tall | The sales volume scenario is obviously lower | You must take yield and returns into account before drawing a conclusion. |
Here's another list of boundaries for you, indicating which parts can safely use recycled materials and which areas require extra caution:
Safe to use: recycled polyester staple fiber, geotextiles, filling cotton; plastic steel strapping, binding tape; thermoformed sheets for non-food trays and blister packaging; injection-molded miscellaneous parts and modified fillers with low appearance requirements.
Be careful: For transparent packaging with high requirements for transparency and hue, you need to choose natural transparent grade; for industrial threads and high-tensile packing straps with high strength requirements, you need to use high-adhesion grade with IV around 0.9 or above.
Do not touch: do not use regular recycled bottle flakes for applications where bottles are directly used for packaging food or beverages. They must undergo deep purification and comply with the GB 4806 series standards for food contact materials and corresponding regulations; materials from unknown sources, medical waste, or pesticide packaging bottles are explicitly not applicable according to standards, no matter how cheap, they cannot be accepted.
Orders don't fail because the materials are expensive; they fail because 'this batch is different from the previous one.'
Let me tell you a situation commonly encountered in the factory (customer information has been anonymized for protection). A local factory in Ningbo producing recycled polyester staple fiber had repeatedly run into problems a few years ago with fiber-grade bottle flakes: trying to save money, they bought a batch of qualified-grade bottle flakes that looked clear on the surface, but once used in the machine, the IV fluctuated wildly, and there were sporadic PVC impurities inside. The spinning broke threads constantly every few days, the workshop staff had to stay by the machines every day adjusting parameters, and in the end, the finished product didn't meet strength standards, forcing them to return a batch of goods.
A turning point came when they connected with Ningbo Kolon New Materials Co., Ltd. Kolon New Materials didn’t rush to quote; they first asked about every detail of the spinning factory’s process, line speed, and requirements for IV and color. Then they matched the goods according to the premium standards of GB/T 40006.9: each batch came with a test report, IV fluctuations were kept within a narrow range, PVC and polyolefin impurities were strictly within the standard limits, and moisture content was delivered according to the machine’s specifications. After switching materials, the breakage rate dropped noticeably, the workshop no longer had to fire-fight every day, and the finished product strength returned to a stable range. All in all, although the unit price of the bottle chips was slightly higher, downtime and returns were significantly reduced, making this deal far more cost-effective.
In the recycled PET industry, what you buy is never 'cheap stuff,' but 'cheap stuff that is the same in every batch.' The four words 'consistent batches' may sound plain, but they exactly hit the threshold of whether recycled materials can truly be used in mass production; it cannot be bypassed.
(Note: The above scenarios are summarized for the purpose of explaining the selection logic and do not refer to any specific customer orders.)
Think about the purpose first, so you won't buy the wrong bottle or tablet.
Finally, summarize the common application scenarios and recommendation levels into a quick reference table, so you can use it when purchasing and avoid flipping back and forth.
| Application scenario | Recommendation Level | Precautions | When to stop using |
|---|
| Recycled polyester staple fiber/spinning | Fiber-grade bottle flakes, premium quality, IV ≥ 0.72 | Keep a close eye on IV fluctuations and PVC impurities | Use qualified grade for high-end yarn |
| Geotextile / Filling Cotton | Fiber-grade qualified products are sufficient | Accept a certain color difference | High tensile strength, use with caution for industrial purposes |
| Plastic steel strapping | High viscosity and thickening grade, IV approximately 0.9 | Need to test breaking tensile strength | Normal grade stretch is easy to break |
| Thermoformed Sheets/Takeout Boxes | Sheet grade, IV 0.76—0.84 | Control of Crystallization and Color Tone | Additional compliance is required for food contact |
| Recycled Beverage Bottles/Food Packaging | Bottle-grade food contact grade | Must comply with the GB 4806 series and follow compliance procedures | Ordinary bottle flakes are strictly prohibited from being used for food. |
| Modified/Injection-Molded Miscellaneous Parts | Ordinary recycled PET slices | Accept ash content and color difference | Use high-precision structural components with caution |
You think recycled PET saves material costs, but what it actually saves is the longest part of the journey where oil is turned into new plastic.
rPET cost reduction chain, confusing bottle grade with fiber grade
Disclaimer: 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 involved in the text are subject to the latest official data from each manufacturer. This article does not constitute any procurement or investment advice.
