EP0270707A1 - Bowstring - Google Patents
Bowstring Download PDFInfo
- Publication number
- EP0270707A1 EP0270707A1 EP86202166A EP86202166A EP0270707A1 EP 0270707 A1 EP0270707 A1 EP 0270707A1 EP 86202166 A EP86202166 A EP 86202166A EP 86202166 A EP86202166 A EP 86202166A EP 0270707 A1 EP0270707 A1 EP 0270707A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- bowstring
- filaments
- polyethylene
- gpa
- kmol
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
- -1 polyethylene Polymers 0.000 claims abstract description 11
- 239000004698 Polyethylene Substances 0.000 claims abstract description 10
- 229920000573 polyethylene Polymers 0.000 claims abstract description 10
- 238000001879 gelation Methods 0.000 claims abstract description 3
- 239000005020 polyethylene terephthalate Substances 0.000 description 3
- 229920004934 Dacron® Polymers 0.000 description 2
- 229920000271 Kevlar® Polymers 0.000 description 2
- 229920003235 aromatic polyamide Polymers 0.000 description 2
- 239000004761 kevlar Substances 0.000 description 2
- 241000531908 Aramides Species 0.000 description 1
- 239000004760 aramid Substances 0.000 description 1
- 235000013871 bee wax Nutrition 0.000 description 1
- 239000012166 beeswax Substances 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 229920000728 polyester Polymers 0.000 description 1
- 229920000139 polyethylene terephthalate Polymers 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 239000001993 wax Substances 0.000 description 1
Classifications
-
- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01F—CHEMICAL FEATURES IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS; APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OF CARBON FILAMENTS
- D01F6/00—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof
- D01F6/02—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof from homopolymers obtained by reactions only involving carbon-to-carbon unsaturated bonds
- D01F6/04—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof from homopolymers obtained by reactions only involving carbon-to-carbon unsaturated bonds from polyolefins
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F41—WEAPONS
- F41B—WEAPONS FOR PROJECTING MISSILES WITHOUT USE OF EXPLOSIVE OR COMBUSTIBLE PROPELLANT CHARGE; WEAPONS NOT OTHERWISE PROVIDED FOR
- F41B5/00—Bows; Crossbows
- F41B5/14—Details of bows; Accessories for arc shooting
- F41B5/1403—Details of bows
- F41B5/1411—Bow-strings
Definitions
- the invention relates to a bowstring made wholly or mainly of synthetic filaments, whether or not bundled into threads.
- Synthetic bowstrings are known and are often applied in archery. Examples are bowstrings on the basis of polyesters, such as a polyethylene terephthalate marketed by Du Pont under the name Dacron, and bowstrings on the basis of aromatic polyamides, such as an aramide product marketed by Du Pont under the name Kevlar.
- the present invention provides a bowstring that, on the one hand, exhibits an extremely low elongation and a very high arrow velocity, while on the other hand, it has an extraordinarily long life.
- the invention therefore relates to a bowstring comprising a number of synthetic filaments, whether or not bundled into threads, that is characterized in that use is made of filaments having a tensile strength of at least 2 GPa and a modulus of at least 20 GPa on the basis of polyethylene having a weight-average molecular weight of at least 4 x 10 5 kg/Kmol.
- filaments obtained by converting a solution of linear polyethylene having a weight-average molecular weight of at least 4 x 10 5 kg/Kmol by thermoreversible gelation into a homogeneous polyethylene gel of virtually the same composition as the solution started from, and stretching this gel at a stretch ratio of at least 10.
- a number of filaments is often bundled into threads, upon which a number of threads is wound into a string, for instance on a string board.
- the number of threads for the string is determined by the desired drawing force of the bow and generally amounts to 8-20, the number of filaments used generally being 1000-3000, depending on filament thickness.
- the length of the string is determined by the bow length and is generally chosen to be 5-10 cm smaller than the bow length.
- the string is in the usual way provided with servings and a middle serving, for instance on a string board, and is often treated with a wax, such as beeswax, to ,keep the threads together.
- a wax such as beeswax
- a bowstring on the basis of polyethylene filaments according to the invention was tested on a longbow during some months. After more than 5000 shots the string exhibited no deterioration in strength or increase in elongation, while the original, very high arrow velocity was fully retained.
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Textile Engineering (AREA)
- Stringed Musical Instruments (AREA)
- Addition Polymer Or Copolymer, Post-Treatments, Or Chemical Modifications (AREA)
- Artificial Filaments (AREA)
Abstract
Bowstring comprising filaments having a tensile strength ≧ 2 GPa and a modulus ≧ 20 GPa on the basis of linear polyethylene having an Mw of a 4 × 105 kg/Kmol.
Preferably the filaments are obtained by thermoreversible gelation of a polyethylene solution followed by stretching.
The bowstring obtained shows very low elongation, a high arrow velocity and an extremely long life.
Description
- The invention relates to a bowstring made wholly or mainly of synthetic filaments, whether or not bundled into threads.
- Synthetic bowstrings are known and are often applied in archery. Examples are bowstrings on the basis of polyesters, such as a polyethylene terephthalate marketed by Du Pont under the name Dacron, and bowstrings on the basis of aromatic polyamides, such as an aramide product marketed by Du Pont under the name Kevlar.
- It has been found that bowstrings from Dacron have a long life, but exhibit the disadvantages of a high elongation and low arrow velocity. Bowstrings from Kevlar, on the contrary, are found to break rather quickly, for instance after 1000-1500 shots, while, on the other hand, the elongation still is substantial and the arrow velocity not yet really high.
- The present invention provides a bowstring that, on the one hand, exhibits an extremely low elongation and a very high arrow velocity, while on the other hand, it has an extraordinarily long life.
- The invention therefore relates to a bowstring comprising a number of synthetic filaments, whether or not bundled into threads, that is characterized in that use is made of filaments having a tensile strength of at least 2 GPa and a modulus of at least 20 GPa on the basis of polyethylene having a weight-average molecular weight of at least 4 x 105 kg/Kmol.
- In the present invention use can be made in particular of filaments obtained by converting a solution of linear polyethylene having a weight-average molecular weight of at least 4 x 105 kg/Kmol by thermoreversible gelation into a homogeneous polyethylene gel of virtually the same composition as the solution started from, and stretching this gel at a stretch ratio of at least 10.
- The preparation of such filaments is disclosed in, for instance, US-A-4,344,908; US-A-4,422,993; US-A-4,430,383; US-A-4,411,854 and US-A-4,436,689.
- In the present invention a number of filaments is often bundled into threads, upon which a number of threads is wound into a string, for instance on a string board. The number of threads for the string is determined by the desired drawing force of the bow and generally amounts to 8-20, the number of filaments used generally being 1000-3000, depending on filament thickness. The length of the string is determined by the bow length and is generally chosen to be 5-10 cm smaller than the bow length.
- The string is in the usual way provided with servings and a middle serving, for instance on a string board, and is often treated with a wax, such as beeswax, to ,keep the threads together.
- A bowstring on the basis of polyethylene filaments according to the invention was tested on a longbow during some months. After more than 5000 shots the string exhibited no deterioration in strength or increase in elongation, while the original, very high arrow velocity was fully retained.
Claims (3)
1. Bowstring comprising a number of synthetic filaments, whether or not bundled into threads, characterized in that use is made of filaments having a tensile strength of at least 2 GPa and a modulus of at least 20 GPa on the basis of polyethylene having a weight-average molecular weight of at least 4 X 105 kg/Kmol.
2. Bowstring according to claim 1, characterized in that use is made of polyethylene filaments obtained by converting a solution of a linear polyethylene having a weight-average molecular weight of at least 4 x 105 kg/Kmol by thermoreversible gelation into a homogeneous polyethylene gel of virtually the same composition as the solution started from and stretching this gel at a stretch ratio of at least 10.
3. Bowstring substantially as described.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| NL8501775A NL8501775A (en) | 1985-06-20 | 1985-06-20 | Bowstring formed from polyethylene filaments - with high tensile strength and modulus |
| EP86202166A EP0270707A1 (en) | 1986-12-04 | 1986-12-04 | Bowstring |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| EP86202166A EP0270707A1 (en) | 1986-12-04 | 1986-12-04 | Bowstring |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| EP0270707A1 true EP0270707A1 (en) | 1988-06-15 |
Family
ID=8195828
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP86202166A Withdrawn EP0270707A1 (en) | 1985-06-20 | 1986-12-04 | Bowstring |
Country Status (1)
| Country | Link |
|---|---|
| EP (1) | EP0270707A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5749214A (en) * | 1996-10-04 | 1998-05-12 | Cook; Roger B. | Braided or twisted line |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2051667A (en) * | 1979-06-27 | 1981-01-21 | Stamicarbon | Preparing polyethylene filaments |
| EP0055001A1 (en) * | 1980-12-23 | 1982-06-30 | Stamicarbon B.V. | Filaments with high tensile strength and modulus and process for the production thereof |
| EP0077590A1 (en) * | 1981-10-17 | 1983-04-27 | Dsm N.V. | Process for the production of polymer filaments having high tensile strength and modulus |
| NL8501775A (en) * | 1985-06-20 | 1987-01-16 | Stamicarbon | Bowstring formed from polyethylene filaments - with high tensile strength and modulus |
-
1986
- 1986-12-04 EP EP86202166A patent/EP0270707A1/en not_active Withdrawn
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2051667A (en) * | 1979-06-27 | 1981-01-21 | Stamicarbon | Preparing polyethylene filaments |
| EP0055001A1 (en) * | 1980-12-23 | 1982-06-30 | Stamicarbon B.V. | Filaments with high tensile strength and modulus and process for the production thereof |
| EP0077590A1 (en) * | 1981-10-17 | 1983-04-27 | Dsm N.V. | Process for the production of polymer filaments having high tensile strength and modulus |
| NL8501775A (en) * | 1985-06-20 | 1987-01-16 | Stamicarbon | Bowstring formed from polyethylene filaments - with high tensile strength and modulus |
Non-Patent Citations (1)
| Title |
|---|
| 25. INTERNATIONALE CHEMIEFASERTAGUNG, Dornbirn, 24th-26th September 1986, pages 1-35, AT; R, KIRSCHBAUM et al.: "High strength/high modulus polyethylene fibers" * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5749214A (en) * | 1996-10-04 | 1998-05-12 | Cook; Roger B. | Braided or twisted line |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
|
| AK | Designated contracting states |
Kind code of ref document: A1 Designated state(s): AT BE CH DE ES FR GB IT LI LU NL SE |
|
| STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN |
|
| 18D | Application deemed to be withdrawn |
Effective date: 19881216 |
|
| RIN1 | Information on inventor provided before grant (corrected) |
Inventor name: SCHOFFELEERS, HENDRIKUS MATHEUS |