{"id":1208,"date":"2026-07-29T03:49:19","date_gmt":"2026-07-29T03:49:19","guid":{"rendered":"https:\/\/foragebaler.com\/?p=1208"},"modified":"2026-07-29T03:49:19","modified_gmt":"2026-07-29T03:49:19","slug":"square-baler-twine-complete-guide","status":"publish","type":"post","link":"https:\/\/foragebaler.com\/ja\/square-baler-twine-complete-guide\/","title":{"rendered":"\u89d2\u578b\u30d9\u30fc\u30e9\u30fc\u7528\u7d50\u675f\u7d10\u5b8c\u5168\u30ac\u30a4\u30c9"},"content":{"rendered":"
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Reference Guide \u00b7 All 9YF Models \u00b7 Twine Selection and Management<\/p>\n

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Twine is a consumable that most producers buy on price without fully understanding what separates adequate from problematic. The wrong twine grade for your bale weight causes knot failures. UV-degraded twine stored on the machine breaks mid-session. Diameter inconsistency in economy twine produces random miss-ties that look like machine faults. This guide covers everything about twine selection, storage and cost calculation for small square baler operation.<\/p>\n

Covers: material types \u00b7 knot strength ratings \u00b7 metres per spool \u00b7 UV storage \u00b7 cost per bale \u00b7 threading \u00b7 bulk buying<\/p>\n

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Material Types: Polypropylene, Sisal and Biodegradable Options<\/h2>\n
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Polypropylene (PP)<\/div>\n
Industry standard \u00b7 UV-stabilised grades available<\/div>\n<\/div>\n
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The dominant material for small square baler use worldwide. PP offers high strength-to-weight ratio, low moisture absorption, resistance to rot and mold, and a wide range of knot strength grades to match bale weight requirements.<\/p>\n

\u6700\u9069\u306a\u7528\u9014:<\/strong> all standard hay, straw and stover baling. UV requirement:<\/strong> quality grade PP contains UV stabilisers that extend outdoor storage life \u2014 always confirm UV stabilisation is included before purchasing.<\/p>\n<\/div>\n<\/div>\n

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Sisal<\/div>\n
Natural fibre \u00b7 biodegradable \u00b7 organic markets<\/div>\n<\/div>\n
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A natural plant fibre twine with full biodegradability \u2014 bales tied with sisal leave no plastic residue in silage or feed. Required for certified organic hay operations and for markets where plastic contamination is a regulatory concern.<\/p>\n

\u5236\u9650\uff1a<\/strong> sisal absorbs moisture and loses 15\u201325% of its knot strength when wet. Requires more careful moisture management than PP. Lower maximum available knot strength than premium PP grades. Degrades faster in outdoor storage.<\/p>\n<\/div>\n<\/div>\n

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Biodegradable Synthetic<\/div>\n
Newer category \u00b7 degradable PP formulations<\/div>\n<\/div>\n
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Biodegradable synthetic twines based on modified PP or PLA (polylactic acid) are a newer category designed to decompose in field or composting conditions while offering closer performance to standard PP than sisal does.<\/p>\n

Considerations:<\/strong> degradation timescale varies by product and is affected by UV exposure, temperature and moisture. Verify degradation certification claims. Knot strength may be lower than standard PP of same diameter. Costs more than standard PP.<\/p>\n<\/div>\n<\/div>\n<\/div>\n

Knot Strength Ratings: The Most Important Specification<\/h2>\n

What Knot Strength Actually Measures<\/h3>\n

Knot strength is the tensile load at which the twine fails at the knot \u2014 the weakest point of the rope system. Knot strength is always lower than linear tensile strength because the knot creates stress concentrations in the rope at the bend point. A twine rated at 110kg knot strength will fail at the knot at approximately 110kg load \u2014 but the same rope may support 170\u2013180kg in a straight pull without a knot. All baler twine specifications use knot strength, not linear tensile strength, because the bale load is applied through the knot.<\/p>\n

Matching Knot Strength to Bale Weight<\/h3>\n

The rule of thumb for minimum safe knot strength: at least 4 times the target bale weight, with 5 times as the safer commercial standard. This accounts for: dynamic load multiplication during bale ejection (approximately 2\u20133 times static bale weight), temperature-related strength variation (hot day field baling reduces effective knot strength by up to 10%), and bale weight variation above the target (a machine set for 24kg bales may occasionally produce 28kg bales in a heavy section of the windrow).<\/p>\n

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Bale Weight Range<\/th>\nMinimum Knot Strength<\/th>\nRecommended Grade<\/th>\nTypical Application<\/th>\n<\/tr>\n<\/thead>\n
12\u201318kg<\/td>\n80kg<\/td>\nStandard PP<\/td>\nLightweight straw, hobby farm use on 9YF-1700<\/td>\n<\/tr>\n
18\u201326kg<\/td>\n110kg<\/td>\nMedium PP<\/td>\nStandard hay \u2014 most common application across 9YF range<\/td>\n<\/tr>\n
26\u201334kg<\/td>\n130\u2013140kg<\/td>\nHeavy-duty PP<\/td>\nHigh-density alfalfa, cattle hay, commercial volumes<\/td>\n<\/tr>\n
34\u201340kg (shredder models)<\/td>\n160kg+<\/td>\nPremium PP<\/td>\n9YF-2200S \/ 9YFS-2.2 at maximum density settings<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n

\"9YF-2200<\/p>\n

Spool Size and Metres Per Spool: Calculating Your Seasonal Requirement<\/h2>\n

Standard Spool Sizes<\/h3>\n

Baler twine is sold in spools of standard metric lengths. The most common size for small square baler use is the 6,500-metre spool \u2014 this fits most spool holders on the 9YF series and provides a manageable weight for manual loading. Larger 8,000\u20139,000-metre spools are available but may not fit some spool holders without modification. Small 3,000\u20134,000-metre spools are available for infrequent users but cost significantly more per metre.<\/p>\n

How Many Metres Per Bale<\/h3>\n

Each bale uses two ropes, each running the full path from spool through the machine and forming the knot at both ends. For the 9YF series 460\u00d7360mm bale cross-section, the total rope perimeter is approximately 1,640mm. Adding needle travel distance and internal routing, the total twine consumption per bale per rope is approximately 2.2\u20132.8 metres. Total per bale (both ropes) is approximately 4.5\u20135.5 metres. Use 5.0 metres per bale as the practical planning figure:<\/p>\n

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Bales per 6,500m spool<\/div>\n
1,300<\/div>\n
(at 5m per bale)<\/div>\n<\/div>\n
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Spools per 1,000 bales (per side)<\/div>\n
0.77<\/div>\n
(rounds to 1 spool per 1,000)<\/div>\n<\/div>\n
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Spools per 5,000-bale season (both sides)<\/div>\n
8<\/div>\n
(4 per knotter side)<\/div>\n<\/div>\n<\/div>\n

Carry sufficient spools for one full session without a spool change stop. For a 200-bale half-day session, carry 2 spools per side minimum \u2014 1 in use, 1 as spare for the end of the installed spool and for any twine breaks that require re-spooling from a fresh spool.<\/p>\n

UV Degradation and Correct Storage<\/h2>\n

How UV Destroys Twine Strength<\/h3>\n

Polypropylene undergoes photodegradation from ultraviolet radiation. UV breaks polymer chains in the fibre at a molecular level \u2014 this process reduces tensile strength before any visible change in colour or texture occurs. A spool of PP twine left on the machine outdoors through a summer of direct sun exposure may lose 25\u201335% of its knot strength, bringing a 110kg-rated twine to an effective rating of 70\u201380kg. This is below the safe minimum for any commercial hay application.<\/p>\n

UV degradation is cumulative and irreversible \u2014 removing the twine to storage after UV exposure does not restore the lost strength. The rate of degradation depends on UV intensity (higher in southern states), exposure duration and whether the PP formulation contains UV stabilisers. UV-stabilised PP twine degrades significantly more slowly than unstabilised grades, but no PP twine is immune to UV damage from prolonged direct outdoor exposure.<\/p>\n

\"square<\/p>\n

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Correct Storage Rules<\/div>\n