Start with the conductor construction, the diameter at each layer boundary and the required production rate. Match the PVC and nylon duties separately, then verify both layers on the produced wire. An existing PVC line is not automatically ready for nylon because it has enough space for another machine.<\/strong><\/p>\nThis guide concerns equipment selection and acceptance evidence for the proposed construction. It does not prescribe a universal wall thickness, processing recipe or certified product range. A machine configuration and a finished-wire qualification are different decisions.<\/p>\n
X\u00e1c \u0111\u1ecbnh \u0111\u01b0\u1eddng k\u00ednh tr\u01b0\u1edbc v\u00e0 sau m\u1ed7i l\u1edbp<\/h2>\n
The first useful drawing shows the conductor, the PVC insulation boundary and the final nylon boundary separately. A finished outside diameter alone cannot establish how much material belongs to each layer.<\/p>\n
For HONGKAI’s initial review, establish the diameter entering and leaving the relevant extrusion stage before selecting the nylon unit. Apply the same discipline to the PVC stage. With stranded conductors, record the actual conductor outside diameter and construction; a copper cross-sectional area is not a substitute for the outer envelope the extrusion tooling will see.<\/p>\n
S\u1eed d\u1ee5ng b\u1ea3ng t\u00ednh ranh gi\u1edbi l\u1edbp sau \u0111\u00e2y v\u1edbi d\u00e2y k\u00e9o \u0111\u01b0\u1ee3c ph\u00ea duy\u1ec7t c\u1ee7a kh\u00e1ch h\u00e0ng. C\u00e1c k\u00fd hi\u1ec7u x\u00e1c \u0111\u1ecbnh k\u00edch th\u01b0\u1edbc, kh\u00f4ng ph\u1ea3i k\u00edch th\u01b0\u1edbc khuy\u1ebfn ngh\u1ecb.<\/p>\n
![\"D0](\"https:\/\/hkcablemachine.com\/wp-content\/uploads\/2026\/10\/01-layer-boundaries-v1.webp\" "\\"Layer")
<\/p>\n
C\u00e1c ranh gi\u1edbi l\u1edbp c\u1ea5u tr\u00fac: x\u00e1c \u0111\u1ecbnh ri\u00eang bi\u1ec7t d\u00e2y d\u1eabn \u0111\u1ea7u v\u00e0o, ranh gi\u1edbi PVC v\u00e0 ranh gi\u1edbi nylon. Kh\u00f4ng c\u00f3 k\u00edch th\u01b0\u1edbc c\u1ee5 th\u1ec3 hay c\u00f4ng th\u1ee9c s\u1ea3n ph\u1ea9m \u0111\u01b0\u1ee3c quy \u0111\u1ecbnh.<\/em><\/p>\n\n\n\n| Boundary<\/th>\n | K\u00edch th\u01b0\u1edbc c\u1ea7n thi\u1ebft l\u1eadp<\/th>\n | \u0110i\u1ec1u n\u00e0y gi\u00fap ng\u01b0\u1eddi mua \u0111\u01b0a ra quy\u1ebft \u0111\u1ecbnh<\/th>\n<\/tr>\n<\/thead>\n |
\n\n| D0: d\u00e2y d\u1eabn \u0111i v\u00e0o m\u00e1y \u0111\u00f9n PVC<\/td>\n | \u0110\u01b0\u1eddng k\u00ednh ngo\u00e0i th\u1ef1c t\u1ebf c\u1ee7a l\u00f5i d\u1eabn \u0111i\u1ec7n, c\u1ea5u t\u1ea1o v\u00e0 sai s\u1ed1 cho ph\u00e9p<\/td>\n | Ki\u1ec3m tra quy tr\u00ecnh ti\u1ebfp nh\u1eadn v\u00e0 d\u1ee5ng c\u1ee5; li\u1ec7u vi\u1ec7c chu\u1ea9n b\u1ecb l\u00f5i d\u1eabn \u0111i\u1ec7n ho\u1eb7c b\u00f3 d\u00e2y c\u00f3 l\u00e0 y\u00eau c\u1ea7u ri\u00eang bi\u1ec7t hay kh\u00f4ng<\/td>\n<\/tr>\n |
\n| D1: PVC-insulated wire before nylon<\/td>\n | \u0110\u01b0\u1eddng k\u00ednh ngo\u00e0i y\u00eau c\u1ea7u sau khi ph\u1ee7 PVC v\u00e0 c\u00e1c y\u00eau c\u1ea7u v\u1ec1 \u0111\u1ed9 d\u00e0y l\u1edbp v\u1ecf PVC<\/td>\n | Nhi\u1ec7m v\u1ee5 PVC v\u00e0 k\u00edch th\u01b0\u1edbc \u0111\u1ea7u v\u00e0o cho giai \u0111o\u1ea1n nylon<\/td>\n<\/tr>\n |
\n| D2: d\u00e2y \u0111\u1ed3ng b\u1ecdc nylon ho\u00e0n thi\u1ec7n<\/td>\n | \u0110\u01b0\u1eddng k\u00ednh ngo\u00e0i cu\u1ed1i c\u00f9ng y\u00eau c\u1ea7u v\u00e0 c\u00e1c y\u00eau c\u1ea7u v\u1ec1 th\u00e0nh nylon<\/td>\n | X\u1eed l\u00fd nylon v\u00e0 d\u00e2y ho\u00e0n thi\u1ec7n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n \u0110\u1ed1i v\u1edbi c\u1ea5u tr\u00fac tr\u00f2n \u0111\u1ed3ng t\u00e2m l\u00fd t\u01b0\u1edfng, c\u00e1c \u0111\u1ed9 d\u00e0y b\u00e1n k\u00ednh danh ngh\u0129a l\u00e0:<\/p>\n \n- PVC thickness = (D1 \u2212 D0) \/ 2.<\/li>\n
- Nylon thickness = (D2 \u2212 D1) \/ 2.<\/li>\n<\/ul>\n
These relationships are a useful consistency check on a proposed drawing. They do not establish minimum thickness around the circumference. A layer can have an acceptable outside diameter while being off-centre, so the technical schedule should state the thickness and eccentricity checks separately.<\/p>\n ![\"Centred](\"https:\/\/hkcablemachine.com\/wp-content\/uploads\/2026\/10\/02-od-versus-wall-v1.webp\" "\\"OD") <\/p>\n
So s\u00e1nh \u0111\u1ed9 l\u1ec7ch t\u00e2m c\u1ee7a PVC: c\u00f9ng \u0111\u01b0\u1eddng k\u00ednh ho\u00e0n thi\u1ec7n c\u00f3 th\u1ec3 che gi\u1ea5u c\u00e1c ph\u00e2n b\u1ed1 l\u1edbp v\u1ecf kh\u00e1c nhau. \u0110\u00e2y kh\u00f4ng ph\u1ea3i l\u00e0 k\u1ebft qu\u1ea3 dung sai \u0111o l\u01b0\u1eddng.<\/em><\/p>\nIf the supplied conductor is not well represented by a circular envelope, or if compound fills spaces in a stranded construction, ask for a construction-specific material calculation. Do not quietly treat an ideal annulus as a complete material-consumption model.<\/p>\n Also identify whether the quoted route starts with finished conductors or includes conductor stranding. The stranding machine has its own applicable range. That range does not prove that every downstream crosshead, extrusion stage and handling unit covers the same products.<\/p>\n The result of this first review should be a layer drawing and input schedule that both parties can use. Without that common boundary, one proposal may be sized for a different nylon wall or conductor condition while appearing to quote the same finished wire.<\/p>\n Translate Layer Thickness Into Separate Extrusion Duties<\/h2>\nWall thickness affects the amount of compound required at a given running speed. Compare that demand with the output available for the actual material and operating conditions, rather than choosing a main extruder from its model number alone.<\/p>\n \u0110\u1ec3 \u01b0\u1edbc t\u00ednh h\u00ecnh h\u1ecdc s\u01a1 b\u1ed9, di\u1ec7n t\u00edch m\u1eb7t c\u1eaft ngang c\u1ee7a m\u1ed7i l\u1edbp tr\u00f2n l\u00e0:<\/p>\n \n- PVC layer area = \u03c0 \u00d7 (D1\u00b2 \u2212 D0\u00b2) \/ 4.<\/li>\n
- Nylon layer area = \u03c0 \u00d7 (D2\u00b2 \u2212 D1\u00b2) \/ 4.<\/li>\n<\/ul>\n
With all dimensions expressed consistently, layer area multiplied by wire length gives the corresponding ideal layer volume. Multiplying area by linear speed gives volumetric demand. If a mass-output comparison is needed, use the density of the specified compound and convert the units consistently; do not borrow an assumed density from another resin.<\/p>\n ![\"Separate](\"https:\/\/hkcablemachine.com\/wp-content\/uploads\/2026\/10\/03-separate-output-duties-v1.webp\" "\\"Separate") <\/p>\n
B\u1ea3ng t\u00ednh k\u00edch th\u01b0\u1edbc h\u00ecnh h\u1ecdc cho c\u00e1c l\u1edbp tr\u00f2n l\u00fd t\u01b0\u1edfng. Gi\u1eef \u0111\u01a1n v\u1ecb nh\u1ea5t qu\u00e1n v\u00e0 s\u1eed d\u1ee5ng m\u1eadt \u0111\u1ed9 th\u1ef1c t\u1ebf c\u1ee7a h\u1ee3p ch\u1ea5t \u0111\u1ec3 so s\u00e1nh kh\u1ed1i l\u01b0\u1ee3ng; \u0111\u00e2y kh\u00f4ng ph\u1ea3i l\u00e0 m\u1ed9t th\u1eed nghi\u1ec7m s\u1ea3n xu\u1ea5t.<\/em><\/p>\nThis worksheet is a demand estimate, not an observed production result. It leaves out construction-specific filling and process allowances unless they are explicitly included in the agreed calculation. It also cannot establish whether the actual extrusion arrangement will produce an acceptable surface and wall distribution at the proposed speed.<\/p>\n A thicker layer or a higher required speed changes the output requirement. The diameter under the layer matters as well: the same radial thickness around a larger incoming wire does not require the same material per unit length. That is why the nylon unit cannot be sized from the word \u201cthin\u201d and the PVC unit cannot be sized from conductor area alone.<\/p>\n Ask the supplier to return the calculation basis with the proposal: D0, D1, D2, the intended running rate, compound identities, calculation assumptions and the output basis for each extrusion stage. If the available evidence is a machine maximum rather than a production trial, label it accordingly.<\/p>\n Do not add the output ratings of the PVC, colour-stripe and nylon extruders and call the result whole-line capacity. Those machines serve different material streams. Equally, a capstan’s mechanical speed rating is not evidence that the specified layers can be produced at that speed.<\/p>\n For HONGKAI’s sizing review, the PVC and nylon walls help determine whether a reference main extruder is sufficient or whether a larger unit is required. A choice such as a 70- or 80-class PVC main machine remains conditional on the construction and required compound output. Neither designation establishes a guaranteed product range by itself.<\/p>\n Note: Keep calculated material demand, a machine’s stated capability and demonstrated acceptable-wire output in separate fields. A proposal is easier to compare when these are not presented as the same number.<\/p>\n Decide What an Existing PVC Line Can Reuse<\/h2>\nReuse depends on material suitability and sufficient output for the specified construction, followed by an interface check. A working PVC extrusion arrangement is not evidence that its screw is suitable for the nylon compound or that its existing duty covers the revised wire.<\/strong><\/p>\nIn the HONGKAI approach confirmed for this guide, PVC and nylon use material-appropriate screw arrangements. Do not approve a nylon duty solely because an available PVC extruder has a familiar screw diameter. Establish the intended compound, screw suitability and required output before deciding which equipment remains in service.<\/p>\n This does not mean that every existing line must be replaced. An existing PVC stage may remain a candidate if it supports the required insulation duty, while the nylon stage is matched separately. Where the required wall and running rate demand more output than the proposed unit can provide, the main extruder size or arrangement needs to be reconsidered.<\/p>\n The reuse proposal should identify what stays, what changes and what remains unverified. Include tooling, the incoming diameter to the nylon stage, cooling, pulling and take-up, and the control connections between retained and added equipment. These are review items, not a claim that HONGKAI has already approved the customer’s existing interfaces.<\/p>\n ![\"Conditional](\"https:\/\/hkcablemachine.com\/wp-content\/uploads\/2026\/10\/04-pvc-reuse-review-v1.webp\" "\\"PVC") <\/p>\n
Conditional reuse review: retain a PVC stage only as a candidate until material duty, nylon-stage matching and interfaces have been checked. Not an approved retrofit layout.<\/em><\/p>\nWhat the \u03a670 \/ \u03a650 \/ \u03a640 Reference Actually Establishes<\/h3>\nC\u00e1c HONGKAI d\u00e2y chuy\u1ec1n s\u1ea3n xu\u1ea5t tham chi\u1ebfu THHN\/THWN<\/a> separates the PVC main extrusion, colour-stripe and nylon-covering functions. In this particular reference package, the \u03a670 PVC main unit, \u03a650 colour-stripe unit and \u03a640 nylon unit are standard included equipment.<\/p>\nThat package is a starting reference, not a universal bill of equipment for every customer. The required walls and output still determine whether the main machine size needs to change. The inclusion of stripe hardware also does not mean every wire specification requires a stripe to be applied.<\/p>\n Keep the discussion focused on functions and verified scope. A buncher range does not become the extrusion line’s range, and a reference layout does not establish compatibility with every existing factory line. The buyer needs an offer tied to the actual incoming conductor and both layer requirements, not just a repeated three-machine label.<\/p>\n If the retained equipment’s relevant details are unknown, the first proposal should identify that limitation. A conditional reuse option is more useful than an unconditional promise that later depends on changing the conductor, reducing speed or altering the required wall.<\/p>\n Ki\u1ec3m tra c\u1ea3 hai l\u1edbp, sau \u0111\u00f3 ki\u1ec3m tra d\u00e2y ho\u00e0n thi\u1ec7n<\/h2>\nAcceptance should distinguish the PVC layer, the nylon layer and the finished product. HONGKAI’s checks described for this guide include thickness, eccentricity, surface condition, spark testing and the specified finished-product tests. Agree the methods and limits for the actual order before the trial.<\/p>\n Record the conductor and material identities with the trial samples. For a surface problem, retain the material-handling and temperature records as well as the observed appearance and measured wall. HONGKAI’s review includes material condition, temperature, surface quality and wall thickness; that scope does not establish a universal fault ranking or one processing recipe for every nylon grade.<\/p>\n BASF’s Ultramid extrusion guidance describes moisture-protective storage and handling for its supplied materials. That supports checking material condition, but it is not a universal drying instruction for the customer’s nylon compound. Use the actual grade supplier’s applicable processing guidance rather than copying film-extrusion settings or another material’s temperature schedule. |
![\"Blank](\"https:\/\/hkcablemachine.com\/wp-content\/uploads\/2026\/10\/05-layer-acceptance-records-v1.webp\" "\\"Layer")
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