How to Choose Denier for Polyester Filling Fiber
English
Denier is often the first number asked for when specifying polyester filling fiber. It matters: finer fiber usually makes a soft, close-fitting fill easier, while coarser fiber usually does more to hold thickness and support. It is not a scale on which finer is always better, or on which one denier is always best. Pillows, duvets, cushions and furniture padding solve different problems. Denier should be read together with cross-section, crimp, finish, cut length, and the buyer’s own machinery and finished article.
The ranges below start from figures already stated on SPRE’s product pages. Common industry filling deniers are then added as typical examples where SPRE does not list them as a fixed grade. Those examples should be sampled against the finished product and machinery.
Ranges already stated on the product pages
In the full specifications on SPRE’s product pages, the denier ranges that relate to filling and padding are:
Microfiber: 0.8D–1.5D, solid or hollow, mechanical crimp, cut length 8mm–51mm, silicon or slick finish, used mainly for filling in clothing, duvets, comforters, pillows and quilts.
Hollow conjugate fiber: 3D–25D, cut length 32mm–76mm, for filling, wadding, padding, ball fiber, insulation and similar uses.
Hollow mechanical-crimp fiber: 6D–15D, cut length 32mm–76mm, for filling, wadding, filtration, insulation and similar uses.
SuperLoft+: 12D–25D hollow conjugate fiber, cut lengths 32mm, 51mm, 64mm and 76mm, positioned for padding. The page also states that fiber for padding is generally over 12D.
SPRE does not cover every filling job with a single denier. Microfiber, standard hollow filling fiber and coarser padding fiber are grouped by the work they do; even inside one range, not every denier suits every finished product equally.
Microfiber (0.8D–1.5D): start with softness and a fine hand
When a pillow, duvet or garment fill is chosen first for softness and a fine, down-like touch, microfiber is the more usual starting point. SPRE supplies microfiber as polyester staple finer than 1.5 denier, at 0.8D–1.5D, with a silicon or slick finish. The page describes it as the softest hand among PSF types and says it looks like feather down, which is why it is sometimes called down fiber. That is a comment on hand feel — not a claim that the fiber is equal to down, and not a guarantee that the fill will never clump or mat.
Microfiber may be solid or hollow, but the product page states that it is mechanical-crimp fiber, not 3D / conjugate crimp. Softness at a fine denier and helical resilience are different requirements. Cut lengths run from 8mm to 51mm; short-cut and standard-cut fiber can open and blow differently, so the cut should be tried against the filling method and cover.
A fine denier is not automatically right for every fill. Cushions, seat pads or padding that must hold a clear shape may feel soft but undersupported if only microfiber is used. In that case it is more reasonable to look at a medium or coarser denier than to add more microfiber in the hope of creating support.
Mid-range denier: 7D as a typical industry starting point
For pillows, duvets and many cushion fills, a denier around 7D is often mentioned in the trade as a familiar starting point between softness and support. That is a typical industry example, not a fixed grade singled out on SPRE’s product pages. 7D falls inside the 3D–25D range of hollow conjugate fiber and inside the 6D–15D range of hollow mechanical-crimp fiber, so it is a common inquiry and sampling start. It should not be written as “7D is always best,” and a 7D fiber will not perform the same in every crimp type or finish.
Within the same range, a somewhat finer denier usually leans toward softness and even fill; moving up toward 10D or 15D usually adds more support. The better step depends on cover thickness, fill weight, sitting or washing conditions, and whether opening and carding can run that denier steadily. Some filling equipment is unfriendly to fiber that is very fine or very coarse; that can only be checked on the machine.
If loft recovery and three-dimensional support are the priority, sample from hollow conjugate fiber. If easy carding, bonding with low-melt fiber, or a wadding structure matters more, sample from hollow mechanical-crimp fiber. The same denier can still produce very different results once crimp and finish change.
Coarser denier and SuperLoft+ (12D–25D): start with support and padding thickness
Furniture seats, backs, mattress toppers and other padding that must hold thickness are rarely specified first as microfiber. A coarser filling denier such as 15D is often used in the trade as a reference starting point. 15D is a typical industry example. It also falls within SPRE’s hollow conjugate range (3D–25D), hollow mechanical-crimp range (6D–15D) and SuperLoft+ range (12D–25D), but it should still be confirmed against the finished product and machinery. It is not a standard answer for every padding construction.
SuperLoft+ is SPRE’s coarser hollow conjugate line for padding, with a stated denier of 12D–25D. The page notes that fiber for padding is generally over 12D, and that thicker fiber is more difficult to produce. Compared with other 12D–25D hollow conjugate non-silicon PSF, SuperLoft+ is described as not only thick but also tough, so that it can provide better resilience and loft in padding. That is the product’s positioning, not a guarantee for every padding structure or compression condition. Listed finishes are dry and slick, plus optional antibacterial and FR; silicon is not listed, which matches padding that needs the fiber to stand and support.
Coarser denier still has to be checked against cut length and machine capability. SuperLoft+ is offered in 32mm, 51mm, 64mm and 76mm cuts. Too short a cut may not hold thickness well; too long a cut may be harder to open or lay into a web. Settle those points by trials on your equipment and in the finished article.
Put denier inside a complete specification
A denier figure alone is rarely enough. A clearer inquiry also states:
End use: pillow, duvet, cushion, garment fill, or furniture padding.
Denier: if a common industry starting point such as 7D or 15D is used, label it as a sampling reference and check it against the available range of the relevant SPRE product.
Cross-section and crimp: microfiber (mechanical crimp, solid or hollow), hollow conjugate, or hollow mechanical crimp; for padding, SuperLoft+ may be named directly.
Finish and cut length: silicon, slick or dry, and a cut length that the blowing or carding equipment can run.
No single denier can maximize both softness and support. Microfiber addresses a fine, soft hand; mid-range deniers are common for everyday pillow and duvet fill; coarser 12D–25D fiber, including SuperLoft+, is aimed at padding support. SPRE suggests narrowing first by end use to the matching product, then comparing samples in the actual cover and on the actual machinery, rather than locking onto one “universal” denier.
中文 / Chinese
填充用涤纶短纤怎么选纤度？从微细旦到 SuperLoft
选填充用涤纶短纤时，纤度往往是第一个被问到的数字。它确实重要：细的纤维通常更容易做出柔软、贴服的填充，粗的纤维通常更能撑起厚度和支撑感。但这不是一条“越细越好”或“某一个纤度永远最好”的尺子。枕芯、被芯、靠垫和家具垫料要解决的问题并不相同，纤度需要和截面、卷曲、后整理、切断长度以及设备和成品一起看。
下面先用 SPRE 产品页上已经写明的纤度范围打底，再补充行业里常见的填充纤度例子。凡是页上没有写成 SPRE 固定规格的数字，都会标明为典型参考，需要按成品和设备打样确认。
先看产品页上已经写明的范围
SPRE 各产品页“完整规格”里，和填充、垫料相关的纤度是这样列的：
微细旦短纤：0.8D–1.5D，可做实心或中空，机械卷曲，切断长度 8mm–51mm，后整理为硅油、slick油剂，主要用于服装、被芯、枕芯等填充。
中空三维短纤：3D–25D，切断长度 32mm–76mm，可用于填充、絮片、垫料、开松球纤、隔热等。
中空机械卷曲短纤：6D–15D，切断长度 32mm–76mm，可用于填充、絮片、过滤、隔热等。
SuperLoft+：12D–25D 的中空三维短纤，切断长度为 32mm、51mm、64mm、76mm，定位于垫料；页上也写到，垫料用纤维的纤度一般在 12D 以上。
SPRE 并不是用一个纤度覆盖所有填充。同一范围内，也不是每一个数字都同样适合某一种成品。
微细旦（0.8D–1.5D）：先满足柔软和细腻手感
当枕芯、被芯、服装填充首先要求柔软、细腻、接近羽绒那种轻软触感时，微细旦是更常被考虑的起点。SPRE 微细旦 的纤度为 0.8D–1.5D，后整理为硅油或 slick油剂，并说明它是各类短纤里手感最软的一类，外形上也常被形容为接近羽绒，因此有时会被称为“羽绒纤维”（down fiber）。这里说的是手感方向，并不是说它可以等同于羽绒，也不保证填充后不会结团或板结。
微细旦可以是实心或中空，但产品页写明它是机械卷曲，不是三维卷曲。细旦柔软和立体螺旋回弹是两件不同的事。切断长度从 8mm 到 51mm，短切和常规切断在开松、灌装上的表现会不一样，需要按灌装方式和套件结构来试。靠垫、座垫或需要明显支撑的垫料，如果只用微细旦，有可能显得软而不够撑，这时应改看中等或较粗的纤度，而不是把微细旦加得更多来勉强支撑。
中等纤度：行业里常见的 7D 这类选择
在枕芯、被芯和许多靠垫填充里，业内经常会提到 7D 左右的纤度，作为柔软和支撑之间的一个常用出发点。这是典型的行业用法，并不是 SPRE 产品页上单独列出的固定牌号。7D 落在中空三维短纤的 3D–25D 范围内，也落在中空机械卷曲短纤的 6D–15D 范围内，因此作为询价和打样起点是常见的，但不能写成“7D 一定最好”，也不能假定每一个 7D 在不同卷曲和后整理下表现都一样。
同一区间里，偏细一些通常更偏向柔软和填充均匀；往上靠近 10D、15D 时，支撑感会更明显。具体选哪一档，要看套件厚度、填充量、坐压或水洗条件，以及开松、梳理能否稳定加工，必要时上机验证。
较粗纤度与 SuperLoft+（12D–25D）：先满足支撑和垫料厚度
家具座垫、靠背、床垫垫层或需要较厚支撑的垫料，通常不会把微细旦当作第一选择。行业里较粗的填充纤度，例如 15D，常被用作这类用途的参考起点。15D 是典型行业例子，它也落在 SPRE 中空三维的 3D–25D、中空机械卷曲的 6D–15D，以及 SuperLoft+ 的 12D–25D 范围内，但仍需按成品和设备确认，不能把 15D 当成所有垫料的标准答案。
SuperLoft+ 是 SPRE 专门用于垫料的较粗中空三维短纤，纤度写明为 12D–25D。产品页说明：垫料用纤维的纤度一般在 12D 以上；纤维越粗，生产难度也越高。与同区间的其他 12D–25D 中空三维非硅油短纤相比，SuperLoft+ 强调单纤不仅粗，而且更有韧性，以便在垫料里提供更好的回弹和蓬松。这是产品定位，不是对每一种垫料结构或压缩条件的结果保证。它列出的后整理是无油、slick油剂，以及可选的抗菌、阻燃，并不列出硅油，这和垫料更需要纤维站住、保持支撑是相符的。
选用较粗纤度时，同样要核对切断长度和上机能力。SuperLoft+ 提供 32mm、51mm、64mm、76mm。过短可能不利于撑起厚度，过长则可能增加开松或铺网难度，应以设备和成品试样为准。
怎么把纤度放到完整规格里
只定一个纤度通常还不够。建议同时写清：
用途：枕芯、被芯、靠垫、服装填充，还是家具垫料。
纤度：若采用 7D、15D 这类行业常见起点，请标明这是打样参考，并对照 SPRE 相应产品的可供范围。
截面和卷曲：微细旦（机械卷曲，实心或中空）、中空三维，或中空机械卷曲；垫料可写 SuperLoft+。
后整理和切断长度：硅油、slick油剂或无油，以及适合灌装或梳棉设备的切断长度。
没有一种纤度能同时把“最软”和“最撑”做到极致。微细旦解决细腻手感，中等纤度常见于日常枕被填充，较粗的 12D–25D、包括 SuperLoft+，则更针对垫料支撑。SPRE 建议先按用途缩小到对应产品，再用小样在实际套件和设备上比较，而不是先锁定某一个“万能纤度”。
Packing and loading / 装箱与装柜
These photos show polyester staple fiber bales in a warehouse and being loaded into a container at SPRE’s China packing site. 以下为 SPRE 国内装箱现场的涤纶短纤包和装柜照片。
FAQs
What denier is SPRE microfiber?
The product page states 0.8D–1.5D, in solid or hollow form, with mechanical crimp, mainly for filling in clothing, duvets, pillows and similar articles.
Is 7D always the best denier for filling fiber?
No. Around 7D is a common industry starting point, not a fixed SPRE grade listed on its own, and it is not right for every pillow, duvet or cushion. Sample against the finished product and machinery.
What denier is SuperLoft+, and where is it used?
The product page states 12D–25D hollow conjugate fiber for padding, and notes that fiber for padding is generally over 12D.
Can SPRE microfiber be specified as 3D / conjugate crimp?
No. The product page states that microfiber is mechanical-crimp fiber. A fine, soft hand and 3D helical resilience are different choices.
What else should be specified together with denier?
At least the end use, cross-section and crimp, finish (silicon, slick or dry) and cut length, then confirmed with samples in the actual cover and on the actual machinery.
常见问题
SPRE 微细旦短纤的纤度是多少？
产品页写明为 0.8D–1.5D，可做实心或中空，机械卷曲，主要用于服装、被芯、枕芯等填充。
7D 是不是填充短纤的最佳纤度？
不是。7D 是行业里常见的中等纤度起点，并不是 SPRE 页上单独列出的固定牌号，也不能适合所有枕芯、被芯或靠垫。需要按成品和设备打样。
SuperLoft+ 的纤度是多少？用在哪里？
产品页写明为 12D–25D 中空三维短纤，用于垫料。页上也说明垫料用纤维的纤度一般在 12D 以上。
微细旦短纤可以当成三维卷曲来用吗？
不可以按三维卷曲来理解。产品页写明微细旦是机械卷曲。细旦柔软和立体螺旋回弹是不同的选择。
选纤度时还要同时确定哪些项目？
至少还要写清用途、截面和卷曲、后整理（硅油、slick油剂或无油）以及切断长度，并在实际套件和设备上对样。
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