GB2078201A - Enveloped yarn package and manufacturing method therefor - Google Patents
Enveloped yarn package and manufacturing method therefor Download PDFInfo
- Publication number
- GB2078201A GB2078201A GB8119379A GB8119379A GB2078201A GB 2078201 A GB2078201 A GB 2078201A GB 8119379 A GB8119379 A GB 8119379A GB 8119379 A GB8119379 A GB 8119379A GB 2078201 A GB2078201 A GB 2078201A
- Authority
- GB
- United Kingdom
- Prior art keywords
- film
- yarn package
- enveloped
- yarn
- thermally
- 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.)
- Granted
Links
- 238000004519 manufacturing process Methods 0.000 title claims description 9
- 239000010408 film Substances 0.000 claims abstract description 81
- 229920001169 thermoplastic Polymers 0.000 claims abstract description 31
- 239000004416 thermosoftening plastic Substances 0.000 claims abstract description 31
- 238000004804 winding Methods 0.000 claims abstract description 14
- 239000010409 thin film Substances 0.000 claims abstract description 8
- 238000000034 method Methods 0.000 claims description 11
- 239000004800 polyvinyl chloride Substances 0.000 claims description 7
- 229920000915 polyvinyl chloride Polymers 0.000 claims description 7
- 239000004952 Polyamide Substances 0.000 claims description 5
- 229920002647 polyamide Polymers 0.000 claims description 5
- 229920000728 polyester Polymers 0.000 claims description 5
- 239000004743 Polypropylene Substances 0.000 claims description 4
- -1 polypropylene Polymers 0.000 claims description 4
- 229920001155 polypropylene Polymers 0.000 claims description 4
- 238000010008 shearing Methods 0.000 claims description 4
- 238000003780 insertion Methods 0.000 abstract description 3
- 230000037431 insertion Effects 0.000 abstract description 3
- 239000013039 cover film Substances 0.000 description 4
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 3
- 239000004411 aluminium Substances 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 2
- 238000004043 dyeing Methods 0.000 description 2
- 239000011347 resin Substances 0.000 description 2
- 229920005989 resin Polymers 0.000 description 2
- 239000007858 starting material Substances 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 1
- 238000009940 knitting Methods 0.000 description 1
- 238000002074 melt spinning Methods 0.000 description 1
- 238000012856 packing Methods 0.000 description 1
- 239000000123 paper Substances 0.000 description 1
- 229920006149 polyester-amide block copolymer Polymers 0.000 description 1
- 238000009987 spinning Methods 0.000 description 1
- 239000002344 surface layer Substances 0.000 description 1
- 238000009941 weaving Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- B65D75/00—Packages comprising articles or materials partially or wholly enclosed in strips, sheets, blanks, tubes, or webs of flexible sheet material, e.g. in folded wrappers
- B65D75/52—Details
- B65D75/58—Opening or contents-removing devices added or incorporated during package manufacture
- B65D75/66—Inserted or applied tearing-strings or like flexible elements
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Yarns And Mechanical Finishing Of Yarns Or Ropes (AREA)
- Packaging Of Annular Or Rod-Shaped Articles, Wearing Apparel, Cassettes, Or The Like (AREA)
Abstract
A package of filament yarn of 15-20 denier wound on a pirn (3) and having tapered yarn winding configurations at both ends is closely enveloped in a thermoplastics thin film (2) which has been thermally shrunk onto the package. Before shrinking the thermoplastic thin film (2) is tubular and has one tapered open end and the other end non-tapered and open for the insertion of the yarn package and pirn, the film having a thermal shrinkage of at least 20%. The loosely covered yarn package is subjected to heat at a temperature not exceeding 130 DEG C of dry heat for a short while e.g. 7-15 seconds to cause shrinking of the film. A tear thread (4) is provided having one end fixed to one open end of the tubular film and the other end protruding a short distance from the other end of the tubular film. The film may be transparent, opaque or coloured. The yarn package is thus kept from collapsing due to mal-handling or during transportation, and can be mounted on a creel stand without being soiled, the thread (4) being pulled to remove the film after mounting. <IMAGE>
Description
SPECIFICATION
Enveloped yarn package and manufacturing
method therefor
The present invention relates to an envelope for
a yarn package having tapered ends, and more particularly it pertains to an enveloped yarn
package formed by winding a man-made
monofilament yarn around a hollow cylindrical
member, generally called a pirn. The invention also
concerns a method for manufacturing such an
enveloped yarn package.
Man-made filament yarns are usually long filaments which are manufactured by a meltspinning process in which a starting material resin
is extruded in its molten state. Such man-made filaments are usually obtained in the form of
multiple-filament yarns, as the molten starting
material, i.e. a resin, is extruded through a plurality of extruder nozzles. Thereafter, the multiple filament yarns are subjected to a drawing step and are wound around a usually hollow, cylindrical core in the form of non-twisted filament yarns.
They are then divided into monofilament yarns, and each of these monofilament yarns is wound around a hollow cylindrical member which is called a core pirn.
A pirn, is, in general, a tubular member made of aluminium, iron or paper, and has an open end which is destined to be applied on to a creel stand.
Monofilament yarns typically have a size in the range of from 15 to 20 denier. In view of the tendency of such yarn packages to be easily collapsed during handling in a subsequent step, such as, knitting and weaving, or during the transportation of yarn packages, and in view of the tendency for the wound yarns to become soiled during such handling or transportation, a great deal of care has been required in the handling of such yarn packages.
An example of a typical configuration of a yarn package usually conveniently handled in the pertinent field of industry, is shown in Figure 1. If a polyester filament yarn of, for example, 1 5 denier, is wound around an aluminium or iron core pirn having a length of about 31 cm and an outer diameter of about 3.5 cm, the resulting yarn package will have a size such that the length of the central cylindrical portion a of the wound filament yarn having a uniform outer diameter is about 1 3 cm, the length of each tapered end portion b of the wound yarn is about 7 cm, and also the taper angle 0 of the portion 6 is about 170.A problem which arises during the handling of this yarn package is that the monofilament yarn located at either one or both of the tapered portions, especially at the shoulder portions of the tapered configuration of the yarn package, has the tendency to collapse as a result of careless handling. Once collapse of the winding of filament yarn takes place, the filament yarn of this yarn package is not longer releasable, so that such a yarn package is destined to be discarded as reject filament yarn. Also, yarn packages are frequently transported to remote places for commercial
purposes, so that cases were frequently
encountered in which the above-mentioned
mishaps occurred during the transportation or
during trans-loading operation or due to
unexpected accident or due to carelessness in
handling during the unloading of packages from a
cargo.Also, yarn packages were often soiled
during the above-mentioned handling.
In the past, yarn packages of this type were
each packed simply by inserting a yarn package into a thin bag made of a resinous film. Such packing could prevent the collapse of filament yarn to a certain degree. However, during the removal of each yarn package from the bag or during the attachment of each yarn package on to a creel stand, accidents such as those mentioned above, could not be completely avoided.
It is, therefore, an object of the present invention to provide an enveloped yarn package having tapered ends, which is free of such inconveniences as those mentioned above and is able to retain its original configuration as a yarn package and which will not collapse nor become soiled during its transportation or handling.
An object of an embodiment of the present invention is to provide an enveloped yarn package of the type as described above, which can be applied to a creel stand easily and which can expose its filament yarn portion by simply pulling up a tear thread which has been integrally provided on the underside or inside of the envelope film.
Another object of the present invention is to provide a method of manufacturing the enveloped yarn package of the type as mentioned above.
According to the present invention there is provided an enveloped yarn package, comprising a yarn package of a man-made monofilament yarn selected from the group consisting of polyester, polyamide and polypropylene wound around a tubular core pirn to have tapered winding end portions, which yarn package is entirely covered, substantially closely with a thermally shrunk thermoplastic thin film, said film being provided with means for shearing apart the film lengthwise of the yarn package.
According to a further aspect of the present invention there is provided a method of manufacturing an enveloped yarn package comprising the steps of: inserting a yarn package prepared by winding a man-made monofilament yarn selected from the group consisting of polyester, polyamide and polypropylene, around a tubular core pirn to have tapered winding end portions, through a thermally shrinkable thermoplastic generally tubular film having open ends and provided with means to shear apart said film, so as to cover the entire surface of said yarn package; and subjecting the resulting film-covered yarn package to a thermal shrinking step to cause shrinkage of said film to produce a substantially closely attached film covering the entire surface of the yarn package.
Embodiments of the present invention will now be described by way of example with reference to the accompanying drawings, in which:
Figure 1 is a diagrammatic perspective view of
an enveloped yarn package according to the
present invention, showing the state in which a
portion of the envelope film has been cut apart by
pulling up a tear-off thread which attached to and
integrally with the underside of the envelope film;
Figure 2 is a diagrammatic perspective
illustration of the configuration of a shrinkable
generally tubular envelope film for enveloping a
yarn package, and
Figure 3 is a diagrammatic perspective
illustration of the generally tubular film of Figure 2
in its flat, folded state.
In the novel enveloped yarn package according
to the present invention which has tapered ends,
the entire external surface of a yarn package is
closely covered by a thermoplastic thin film having
thermally shrinkable property, in substantially close
contact with the entire package surface. More
particularly, the enveloped yarn package
according to the present invention has a thermally
shrinkable thermoplastic thin cover film which
closely covers a yarn package substantially in
close contact with the entire external surface of the yarn package which has been prepared by winding a man-made monofilament yarn around a tubular core pirn, and this cover film is provided with means for tearing this cover film apart lengthwise of the package.In order to manufacture such an enveloped yarn package, preferably, a thermally shrinkable transparent tubular member 2 is prepared (see Figure 2) of thermally shrinkable thermoplastic thin film having a configuration suitable for accommodating a yarn package 1 which is formed by winding a man
made filament yarn around a core pirn 3. Thus, as shown in Figures 2 and 3, it has a hollow
cylindrical portion and a tapered end portion each
having an open end.
For example, for a yarn package having the
afore-mentioned size which has a winding of a 1 5 denier polyester or polyamide or polypropylene
monofilament yarn wound around a core pirn, a
generally tubular envelope of a thermally
shrinkable thermoplastic polyvinyl chloride thin
film having the above described shape and
configuration as shown in Figure 2, is suitable. A
similar envelope film may be used for such
filament yarns of up to 20 denier. This tubular
enveloping member as a generally cylindrical
configuration having one end portion tapered, and
when flattened as shown in Figure 3, has, in one
embodiment, generally a width of 1 5 cm for the
body portion and a overall length of 38 cm.The
end portion of this generally tubular enveloping
member at the inlet portion through which the
yarn package is inserted is entirely open, while the
other end portion is tapered progressively to form
an open end providing a configuration which is convenient for accommodating the end portion of the tubular core pirn which is mounted on to a creel stand (not shown).A thread 4 having one end secured to the non-tapered end portion 5 of the tubular film 2 and being turned over the edge
of the end opening of this non-tapered portion,
extends backwardly through the entire length of
this hollow film 2 and protrudes for a short distance
beyond the edge of the other open end of the tapered portion to provide a nipping end, for use
ultimately to be pulled longitudinally of the
package to tear apart the generally tubular film 2
which, in the final enveloped package, has been
applied to and fittingly covers the external surface
of the yarn package by pulling up the thread 4
longitudinally of the package. The site at which the thread 4 is attached to the generally tubular film 2 is not limited to that described above,
located in the vicinity of the non-tapered open end of the tubular film 2.The site of attachment of the thread 4 may, alternatively, be positioned in the
vicinity of the opposingly located open end of the tapered portion of the film 2. However, the type of
thread attachment illustrated in the drawings is
convenient for the insertion of a yarn package through the generally tubular covering film 2. The generally tubular film 4 per se has an overall
length slightly greater than that of the yarn
package itself, since the non-tapered open end portion as well as the tapered open end portion of the generally tubular film 2 will both be bent over
at the associated respective open end edges of the core pirn in the finally produced enveloped yarn package.
In order to manufacture a final enveloped yarn package or so-called pirn 1, one end of a nonenveloped yarn package 1 is inserted through the non-tapered open end of the tubular film 2 to cover not only the entire surface of the filament yarn region which is wound around the tubular core pirn, but also to cover both of the exposed, i.e. end portions where no filament yarn is wound, that is, the leading end portion and the trailing end portion, of the hollow core pirn. Furthremore, the tapered end portion of the generally tubular film 2 is bent backwardly at the associated end edge of the tubular core pirn, over into the inside of the tubular end along the inner wall surface of this tubular end portion of the core pirn, to retain the opening thereat so as to allow the insertion of the creel stand therethrough.On the other hand, the non-tapered open end portion of the tubular film 2 is also bent in the same manner at the other end edge of the tubular core pirn. Such a yarn package with its tubular cover film is then passed through a heated-air furnace under the conditions described below.
The thermally shrinkable thermoplastic enveloping film 2 for covering a yarn package to provide an enveloped yarn package according to the present invention is made, conveniently, of a thin polyvinyl chloride film sheet. Such a film sheet is commercially available as a thermally shrinkable thermoplastic film sheet. With a thermally shrinkable tubular film made of such film sheet having, for example, the aforementioned size and applied to a yarn package having, for example, the aforementioned size, when heat is applied thereto, about 8.3% shrinkage will take place at that portion of the generally tubular film corresponding to that of the yarn package which has a uniform large diameter, and about 40% shrinkage will occur in that portion of the film located at a side corresponding to the exposed end portions, i.e. those end portions of the core pirn where no filament yarn is wound.
Thus, thermally shrinkable thermoplastic film ought to be selected to have a shrinkage of at least 40% or greater. It should be appreciated, however, that, critical portions of the yarn package which require protection from hazards lie, indeed, at both shoulder portions of the wound filament yarn at which the taper configurations commence.
Therefore, their protection will be achieved by selecting a thermally shrinkable thermoplastic film having a shrinkage of at least 20%.
Commercially available thermally shrinkable polyvinyl chloride films as an example, in general, will shrink when subjected to a heat at a low temperature in the range of from about 1 500C and about 800C. The mechanism of shrinkage of such thermoplastic film is known, and therefore no detailed explanation is given. In the method of the present invention, however, it is preferred to elevate the operation efficiency by causing a quick shrinkage of the thermoplastic film by providing for its stay, for about 7 to 1 5 seconds, in a furnace through which a heated air of about 1 200C is passed.It should be appreciated, however, that if the temperature within the heated-air furnace exceeds 1 500 C, and especially it exceeds 1 300C as measured by dry heat, this would cause a change in the molecular structure at the surface portion of the man-made mono-filament yarn which is located at the surface layer of the winding of filament yarn formed around the tubular core pirn. Such change in the molecular structure of filament yarn will bring about undesirable uneven dyeing of the filament yarn during the subsequent step of dyeing. Thus, it is necessary to arrange so that a required amount of shrinkage of the thermoplastic film is obtained at a temperature lower than 1 500C, and lower than 1 300C in the case of dry heat, is adopted.The thermally shrinkable thermoplastic film which is preferably used in the present invention has a small thickness which is in the range of 0.01 mm to 0.1 mm. Usually, a thickness of 0.02 mm to 0.03 mm is adopted to envelope a package of filament yarn of 1 5 to 20 denier.
A shrunk film will have a slightly increased hardness with a slightly reduced thermoplasticity.
Thus, in order to facilitate the breaking open of the envelope of the yarn package, a free end of the thread 4 protruding from an end of the envelope film is nipped with the user's fingers and pulled upwards along the length of this thread 4 which passes through the generally tubular thermoplastic thin film, towards the other end of the thread which is fixed to the other end of the envelope film. Thus, the envelope film 2 is very easily cut apart to expose the filament yarn wound on a core pirn. The mechanism by which the thermoplastic film is breached by the application of external force will also not require explanation.
In ordinary spinning plants, such enveloped yarn packages are mounted on respective creel stands, and their threads 4 are progressively pulled outwards starting at their protruding end portions. Thus, it is possible to easily remove the envelope films without the operator's fingers directly touching the filament yarns. Thus, the filament yarn is kept from being soiled.
The thermally shrinkable thermoplastic film used in the present invention is preferably transparent to provide a good view of the filament yarn winding lying underneath. It should be understood that the film may be semi-opaque, opaque, or coloured to meet the conveniences, as the may may require.
Claims (23)
1. An enveloped yarn package, comprising a yarn package of a man-made monofilament yarn selected from the group consisting of polyester, polyamide and polypropylene wound around a tubular core pirn to have tapered winding end portions, which yarn package is entirely covered, substantially closely with a thermally shrunk thermoplastic thin film, said film being provided with means for shearing apart the film lengthwise of the yarn package.
2. An enveloped yarn package according to
Claim 1, wherein said film is transparent.
3. An enveloped yarn package according to
Claim 1, wherein said film is opaque.
4. An enveloped yarn package according to any preceding claim, wherein said film is coloured.
5. An enveloped yarn package according to any preceding claim, wherein said thermoplastic film is a thermally shrinkable polyvinyl chloride.
6. An enveloped yarn package according to
Claim 5, wherein said polyvinyl chloride film has a shrinkability of at least 20% at 80"C when subjected to dry heat temperature of up to 1300 C.
7. An enveloped yarn package according to
Claim 6, wherein said polyvinyl chloride film has a shrinkability of about 40% at 800C.
8. An enveloped yarn package according to any preceding claim, wherein said means for shearing
apart the film is a string-form member having a mechanical strength at least greater than the shear-apart strength of the thermally shrunk thermoplastic film, and said string-form member has an end portion fixed to said film and the other end protruding beyond an end edge of said core pirn to provide a nipping end.
9. An enveloped yarn package according to any preceding claim, wherein said monofilament has a size in the range of from 8 to 50 denier.
10. An enveloped yarn package according to any preceding claim, wherein said film has a thickness in the range of from 0.01 mm to 0.1 mm.
11. An enveloped yarn package according to
Claim 10, wherein said film has a thickness in the range from 0.02 mm to 0.03 mm.
12. An enveloped yarn package substantially as herein described with reference to the accompanying drawings.
13. A method of manufacturing an enveloped yarn package comprising the steps of: inserting a yarn package prepared by winding a man-made monofilament yarn selected from the group consisting of polyester, polyamide and polyrpopylene, around a tubular core pirn to have tapered winding end portions, through a thermally shrinkable thermoplastic generally tubular film having open ends and provided with means to shear apart said film, so as to cover the entire surface of said yarn package; and subjecting the resulting film-covered yarn package to a thermal
shrinking step to cause shrinkage of said film to
produce a substantially closely attached film covering the entire surface of the yarn package.
14. A method according to Claim 13, wherein said thermally shrinkable thermoplastic film is transparent.
15. A method according to Claim 13, wherein said thermally shrinkable thermoplastic film is
opaque.
16. A method according to any one of Claims
13 to 15, wherein said thermally shrinkable thermoplastic film is coloured.
17. A method according to any one of Claims
13 to 16, wherein said thermally shrinkable thermoplastic film is a thermally shrinkable polyvinyl chloride.
18. A method according to any one of Claims
13 to 17, wherein said thermally shrinkable thermoplastic film has a shrinkability of at least 20% at 800C when subjected to dry heat at a temperature of up to 1300 C.
19. A method according to Claim 18, wherein said thermally shrinkable thermoplastic film has a shrinkability of about 40% at 800C.
20. A method according to any one of Claims 13 to 19, wherein said thermally shrinking step is conducted at a temperature in the range of from 800C to 1 500C when subjected to dry heat at a temperature of up to 1 300C.
21. A method according to Claim 20, wherein said thermally shrinking step is conducted at 1 200C for 7 to 1 5 seconds.
22. A method according to any one of Claims 13 to 21, wherein said means for shearing apart the film is a string-form member having a mechanical strength at least greater than the shear-apart strength of the thermally shrunk thermoplastic film, and said string-form member has an end portion fixed to said film and the other end protruding beyond an end edge of said core pirn to provide a nipping end, and said thermal shrinking step is carried out in this state of the yarn package covered with the thermoplastic film having the shear-apart string-form member.
23. A method of manufacturing an enveloped yarn package substantially as herein described with reference to the accompanying drawings.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8451480A JPS5711234A (en) | 1980-06-24 | 1980-06-24 | Packed palm wound yarn and method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| GB2078201A true GB2078201A (en) | 1982-01-06 |
| GB2078201B GB2078201B (en) | 1984-03-28 |
Family
ID=13832738
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB8119379A Expired GB2078201B (en) | 1980-06-24 | 1981-06-23 | Enveloped yarn package and manufacturing method therefor |
Country Status (5)
| Country | Link |
|---|---|
| JP (1) | JPS5711234A (en) |
| FR (1) | FR2485490B1 (en) |
| GB (1) | GB2078201B (en) |
| IT (1) | IT1136893B (en) |
| MX (1) | MX153088A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0992437A1 (en) * | 1998-10-07 | 2000-04-12 | Trevira GmbH & Co KG | Dynamically balanced packaged object |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2720309A (en) * | 1953-06-19 | 1955-10-11 | Goodyear Tire & Rubber | Twine package |
| US2884328A (en) * | 1954-09-16 | 1959-04-28 | Union Carbide Corp | Method of and apparatus for producing a tightly packaged food product |
| GB781101A (en) * | 1955-02-11 | 1957-08-14 | British Nylon Spinners Ltd | Improvements in or relating to packages of yarn |
| US3399761A (en) * | 1966-07-04 | 1968-09-03 | Asahi Chemical Ind | Yarn package |
| US3915301A (en) * | 1971-02-08 | 1975-10-28 | Owens Corning Fiberglass Corp | Covered tubular package of glass roving and method of making |
| CA1013717A (en) * | 1974-06-28 | 1977-07-12 | Atlantic Gummed Paper Corporation | Yarn package and method for making and dispensing |
-
1980
- 1980-06-24 JP JP8451480A patent/JPS5711234A/en active Pending
-
1981
- 1981-06-22 IT IT22500/81A patent/IT1136893B/en active
- 1981-06-23 GB GB8119379A patent/GB2078201B/en not_active Expired
- 1981-06-23 MX MX187956A patent/MX153088A/en unknown
- 1981-06-24 FR FR8112429A patent/FR2485490B1/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0992437A1 (en) * | 1998-10-07 | 2000-04-12 | Trevira GmbH & Co KG | Dynamically balanced packaged object |
Also Published As
| Publication number | Publication date |
|---|---|
| IT8122500A0 (en) | 1981-06-22 |
| MX153088A (en) | 1986-07-30 |
| GB2078201B (en) | 1984-03-28 |
| IT1136893B (en) | 1986-09-03 |
| FR2485490B1 (en) | 1985-08-16 |
| JPS5711234A (en) | 1982-01-20 |
| FR2485490A1 (en) | 1981-12-31 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PCNP | Patent ceased through non-payment of renewal fee |