CA1173339A - Bonding tape for veneers - Google Patents
Bonding tape for veneersInfo
- Publication number
- CA1173339A CA1173339A CA000373172A CA373172A CA1173339A CA 1173339 A CA1173339 A CA 1173339A CA 000373172 A CA000373172 A CA 000373172A CA 373172 A CA373172 A CA 373172A CA 1173339 A CA1173339 A CA 1173339A
- Authority
- CA
- Canada
- Prior art keywords
- bonding
- yarn
- tape
- veneers
- aggregate
- 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.)
- Expired
Links
Classifications
-
- D—TEXTILES; PAPER
- D02—YARNS; MECHANICAL FINISHING OF YARNS OR ROPES; WARPING OR BEAMING
- D02G—CRIMPING OR CURLING FIBRES, FILAMENTS, THREADS, OR YARNS; YARNS OR THREADS
- D02G3/00—Yarns or threads, e.g. fancy yarns; Processes or apparatus for the production thereof, not otherwise provided for
- D02G3/22—Yarns or threads characterised by constructional features, e.g. blending, filament/fibre
- D02G3/40—Yarns in which fibres are united by adhesives; Impregnated yarns or threads
-
- D—TEXTILES; PAPER
- D02—YARNS; MECHANICAL FINISHING OF YARNS OR ROPES; WARPING OR BEAMING
- D02G—CRIMPING OR CURLING FIBRES, FILAMENTS, THREADS, OR YARNS; YARNS OR THREADS
- D02G3/00—Yarns or threads, e.g. fancy yarns; Processes or apparatus for the production thereof, not otherwise provided for
- D02G3/44—Yarns or threads characterised by the purpose for which they are designed
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Textile Engineering (AREA)
- Veneer Processing And Manufacture Of Plywood (AREA)
Abstract
Abstract Bonding tape for veneers in which an aggregate yarn is formed by gathering a number of mono-filament yarns to a size of 50 to 250 deniers and twisting it 10 to 30 times per meter. A
number of these aggregate yarns are aligned in a tape-like form and are then impregnated or coated with an adhesive to form a single tape. This tape is gathered up after the adhesive is hardened.
number of these aggregate yarns are aligned in a tape-like form and are then impregnated or coated with an adhesive to form a single tape. This tape is gathered up after the adhesive is hardened.
Description
~ ~73~39 Bonding Tape for Ve~eers This invention relatas to a ~onding tape for veneers to be used for transversely ~onding a number of veneers that are cut to a pxedetermined size ;nto a belt-like sheet.
Conventionally, in transversel~ bonding plural veneers cut to a predetermined size into a sheet by means of bonding yarns, the bonding yarns must have such a strength as not to be broken when t~e ~elt-like veneer sheet formed by transversely bonding the plural veneers i8 moved during the drying step or during the laminating-bonding step. Hence it is necessary to use yarns of considerably greater thick-ness.
The accompanying drawings show an embodiment of the present inv~ntion and a control embodiment r wherein Figure l(a~ is a sectional view of the bonding tape of the control embodi-ment; Figure lCbl is a sectional view of the bonding tape of the present invention; ~igure 2~a) is a sectional view showing the state of ~onding of the control; and Figure 2~b) is a sectional view showing the state of bonding o~ the present invention.
yc~r~ S
5~j~ If ordinary, thin, twisted filament~ ~re aligned into a tape-like form, the resulting bonding tape has the desired strength.
In the case of veneers having a thickness of lmm or more, this bonding tape compresses the veneers and is pushed into the sheet surfaces so that ridges do not occur on the other side of the veneers.
.. ~
~ ' ~
. .
' . ' ' 3 3 ~ 9 ~hen veneers thinner than lmm are transversely bonded by the aforementioned ~onding tape, however, ridges do occur on t~e surface on t~e other sid~ of the veneers.
~ r~ ~0 Accordingly, in order to solve the above-mentioned problem, the inventors of the present invention selected a perfectly untwisted yarn of la~0 deniers consisting of 250 mono-filaments of a polyester as a yarn that can be easily expanded by a pushing force when transversely bonding the veneers and that has a required strength. T~is yarn was passed through a solution of a thermoplastic adhesive, allowing the yarn -to ~e impregnated by the adhesive to form a bonding yarn coated and Lmpregnated with adhesive as shown in Figure l~al. When t~e veneers were transversely bonded using this yarn, the strength of the bonding yarn was of course sufficient, but when the resulting veneer was trans-ported and was bent at the joint portions between the veneers, the ~onding yarn underwent inter-layer peeling whereby the bonding yarn and the veneers were often separated from one another at t~at portion. When the portion at which the inter-layex peeling occurred was examined, the amount of adhesive remaining was found to be extremely sm~ 1 wh~le a large amount of the adhes;ve was found to have out on both sides of the ~onding yarn.
: When the thin veneers formed by transversely bonding the individual veneers by the above-mentioned 1000-denier bonding yarn were laminated and bonded together, ridges occurrPd on the surface opposite the bonding yarn. Thus, the bonding yarn was found to be unsuitable for transversely bonding the thin veneers.
The present invention is directed to provide a bonding tape for veneers which has excellent bonding power, is likely to expand in the direction of its width, does not underyo inter-layer peeling due to bending or the like, and does not develop ridges as a result of the force of .
~ 1733~9 the bonding tape when transversely bonding the thin veneers together.
According to the present invention there is provided a bond-ing yarn for a veneer including a plurality of aggregate S yarns, each aggregate yarn being formed by gathering a number of mono-filaments, each aggregate yarn being of a size o 50 to 250 deniers and being twisted 10 to 30 times per meter, said aggregate yarns being aligned in a belt-like form and then impregnated or coated with an adhesive to form a single tape-like bonding yarn.
Hereinafter, the present invention will be described in detail.Referring to Fig. l~b) the mono-fil.aments to be used in the .. present invention consist of a synthetic fiber such as polyesteror the like, or nylon or the like, and the aggregate yarn is . 15 formed by putting 20 to 50 mono-:Eilaments together and twisting : them 10 to 30 times per meter.
Three to ten aggregate yarns thus formed are pulled out from plural bobbins and while they are being aligned in a flat tape-like form they are passed through a solution of an adhesive. After an excess amount of the adhesive is removed by passing the aggregate yarns through a pair of upper and lower rollers, the adhesive is hardened into a solid mass and the plural, aligned yarns are shaped into a single tape~
like form as shown in Figure l(b). The formed tape is then 25 wound up onto a bobbin.
Incidentally, the number of the unit filaments is reduced for bonding of thin veneers and is increased for thick veneers.
When the bonding tape formed as described above is used for transversely bonding veneers cut to a predetermined size, the adhesive between the aggregate yarns is prevented from ~. , .
~ ~ .
' ' .
-~ ~ 733~
flowing out by them. Since the number of twists applied to each aggregate yarn is small, the adhesive is allowed to fluidize easily.
Moreover, even when the same pressure is applied under heating to a tape as to a single thick yarn, the pressure over a unit area is rela-tively small because the pressure-bearing area is relatively great, thereby allowing the mono-filaments to expand perpendicularly - to the direction of alignment, as seen in Fig. 2(b), as well as allowing for the penetration and stay of the adhesive between and/or among the mono-filaments. Accordingly, each aggregate yarn of the bonding tape expands in the direction of its width, becomes extremely thin and comes into contact with other aggregate yarlls so that even when the transversely bonded veneer is transported, strong bonding can be attained without causing peeling of any portion, and the inter-layer peeling does not occur at the butting portions at the side edges of the individual veneer sheets.
When the thin individual veneers are transversely bonded to form a bonded veneer sheet by use of the above-mentioned bonding tape and the resulting bonded sheets are laminated and bonded together using the bonding tape, ridges normally resulting from the use of ordinary bonding tape do not occur at all on the sheet surface.
; Further, the inventors carried out the peel test for the following bonding yarn A and bonding tape B. The bonding yarn A comprised a perfectly untwisted yarn of 1000 deniers consisting of 250 mono-filaments of polyester and impregnated with a thermoplastic adhesive. The bonding tape B was composed of four aggregate yarns, each consisting of 48 mono-filaments of polyester, of 250 deniers and twisted 26 times per meter. The four aggregate yarns were ; aligned in a tape-like form and were then passed through the same thermoplastic adhesive as used in the bonding tape A, and the excessive adhesive was removed. The bonding tape B was the bonding tape in accordance with the present invention. These bonding yarn A and tape B were heat-pressed onto the same veneers with :1 1 733;39 a gap between them, and the peel test was effected six times by pullin~ the yarn A and tape B in the perpendicular direction to the sheet surface after cooling.
The results are illustrated in the Table below.
A (g) B(y)
Conventionally, in transversel~ bonding plural veneers cut to a predetermined size into a sheet by means of bonding yarns, the bonding yarns must have such a strength as not to be broken when t~e ~elt-like veneer sheet formed by transversely bonding the plural veneers i8 moved during the drying step or during the laminating-bonding step. Hence it is necessary to use yarns of considerably greater thick-ness.
The accompanying drawings show an embodiment of the present inv~ntion and a control embodiment r wherein Figure l(a~ is a sectional view of the bonding tape of the control embodi-ment; Figure lCbl is a sectional view of the bonding tape of the present invention; ~igure 2~a) is a sectional view showing the state of ~onding of the control; and Figure 2~b) is a sectional view showing the state of bonding o~ the present invention.
yc~r~ S
5~j~ If ordinary, thin, twisted filament~ ~re aligned into a tape-like form, the resulting bonding tape has the desired strength.
In the case of veneers having a thickness of lmm or more, this bonding tape compresses the veneers and is pushed into the sheet surfaces so that ridges do not occur on the other side of the veneers.
.. ~
~ ' ~
. .
' . ' ' 3 3 ~ 9 ~hen veneers thinner than lmm are transversely bonded by the aforementioned ~onding tape, however, ridges do occur on t~e surface on t~e other sid~ of the veneers.
~ r~ ~0 Accordingly, in order to solve the above-mentioned problem, the inventors of the present invention selected a perfectly untwisted yarn of la~0 deniers consisting of 250 mono-filaments of a polyester as a yarn that can be easily expanded by a pushing force when transversely bonding the veneers and that has a required strength. T~is yarn was passed through a solution of a thermoplastic adhesive, allowing the yarn -to ~e impregnated by the adhesive to form a bonding yarn coated and Lmpregnated with adhesive as shown in Figure l~al. When t~e veneers were transversely bonded using this yarn, the strength of the bonding yarn was of course sufficient, but when the resulting veneer was trans-ported and was bent at the joint portions between the veneers, the ~onding yarn underwent inter-layer peeling whereby the bonding yarn and the veneers were often separated from one another at t~at portion. When the portion at which the inter-layex peeling occurred was examined, the amount of adhesive remaining was found to be extremely sm~ 1 wh~le a large amount of the adhes;ve was found to have out on both sides of the ~onding yarn.
: When the thin veneers formed by transversely bonding the individual veneers by the above-mentioned 1000-denier bonding yarn were laminated and bonded together, ridges occurrPd on the surface opposite the bonding yarn. Thus, the bonding yarn was found to be unsuitable for transversely bonding the thin veneers.
The present invention is directed to provide a bonding tape for veneers which has excellent bonding power, is likely to expand in the direction of its width, does not underyo inter-layer peeling due to bending or the like, and does not develop ridges as a result of the force of .
~ 1733~9 the bonding tape when transversely bonding the thin veneers together.
According to the present invention there is provided a bond-ing yarn for a veneer including a plurality of aggregate S yarns, each aggregate yarn being formed by gathering a number of mono-filaments, each aggregate yarn being of a size o 50 to 250 deniers and being twisted 10 to 30 times per meter, said aggregate yarns being aligned in a belt-like form and then impregnated or coated with an adhesive to form a single tape-like bonding yarn.
Hereinafter, the present invention will be described in detail.Referring to Fig. l~b) the mono-fil.aments to be used in the .. present invention consist of a synthetic fiber such as polyesteror the like, or nylon or the like, and the aggregate yarn is . 15 formed by putting 20 to 50 mono-:Eilaments together and twisting : them 10 to 30 times per meter.
Three to ten aggregate yarns thus formed are pulled out from plural bobbins and while they are being aligned in a flat tape-like form they are passed through a solution of an adhesive. After an excess amount of the adhesive is removed by passing the aggregate yarns through a pair of upper and lower rollers, the adhesive is hardened into a solid mass and the plural, aligned yarns are shaped into a single tape~
like form as shown in Figure l(b). The formed tape is then 25 wound up onto a bobbin.
Incidentally, the number of the unit filaments is reduced for bonding of thin veneers and is increased for thick veneers.
When the bonding tape formed as described above is used for transversely bonding veneers cut to a predetermined size, the adhesive between the aggregate yarns is prevented from ~. , .
~ ~ .
' ' .
-~ ~ 733~
flowing out by them. Since the number of twists applied to each aggregate yarn is small, the adhesive is allowed to fluidize easily.
Moreover, even when the same pressure is applied under heating to a tape as to a single thick yarn, the pressure over a unit area is rela-tively small because the pressure-bearing area is relatively great, thereby allowing the mono-filaments to expand perpendicularly - to the direction of alignment, as seen in Fig. 2(b), as well as allowing for the penetration and stay of the adhesive between and/or among the mono-filaments. Accordingly, each aggregate yarn of the bonding tape expands in the direction of its width, becomes extremely thin and comes into contact with other aggregate yarlls so that even when the transversely bonded veneer is transported, strong bonding can be attained without causing peeling of any portion, and the inter-layer peeling does not occur at the butting portions at the side edges of the individual veneer sheets.
When the thin individual veneers are transversely bonded to form a bonded veneer sheet by use of the above-mentioned bonding tape and the resulting bonded sheets are laminated and bonded together using the bonding tape, ridges normally resulting from the use of ordinary bonding tape do not occur at all on the sheet surface.
; Further, the inventors carried out the peel test for the following bonding yarn A and bonding tape B. The bonding yarn A comprised a perfectly untwisted yarn of 1000 deniers consisting of 250 mono-filaments of polyester and impregnated with a thermoplastic adhesive. The bonding tape B was composed of four aggregate yarns, each consisting of 48 mono-filaments of polyester, of 250 deniers and twisted 26 times per meter. The four aggregate yarns were ; aligned in a tape-like form and were then passed through the same thermoplastic adhesive as used in the bonding tape A, and the excessive adhesive was removed. The bonding tape B was the bonding tape in accordance with the present invention. These bonding yarn A and tape B were heat-pressed onto the same veneers with :1 1 733;39 a gap between them, and the peel test was effected six times by pullin~ the yarn A and tape B in the perpendicular direction to the sheet surface after cooling.
The results are illustrated in the Table below.
A (g) B(y)
2 500 600
3 580 620
4 570 650 average 533 635 As can be seen clearly from the above table, there is a distinctive difference in the bonding power between bonding yarn A and tape B irrespective of the fact that the number of mono-filaments of bonding tape B is smaller than that of bonding yarn A. Whereas the bonding power of bonding tape B
is stable, that of bonding yarn A exhibits a large variance.
It i9 thus found that bonding yarn ~ is likely to undergo peeling in the region where t~e bonding power is small.
While the embodiment disclosed herein is preferred, it will be appreciated that other variations and modifications will be obvious to those skilled in the art, and they are intended to be encompassed by the following claims.
:, '
is stable, that of bonding yarn A exhibits a large variance.
It i9 thus found that bonding yarn ~ is likely to undergo peeling in the region where t~e bonding power is small.
While the embodiment disclosed herein is preferred, it will be appreciated that other variations and modifications will be obvious to those skilled in the art, and they are intended to be encompassed by the following claims.
:, '
Claims (7)
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. A bonding yarn for a veneer including a plurality of aggregate yarns, each aggregate yarn being formed by gathering a number of mono-filaments, each aggregate yarn being of a size of 50 to 250 deniers and being twisted 10 to 30 times per meter, said aggregate yarns being aligned in a belt-like form and then impregnated or coated with an adhesive to form a single tape-like bonding yarn.
2. A yarn according to claim 1 including 20 to 50 mono-filaments in each aggregate yarn.
3. A yarn according to claim 1 including 3 to 10 aggregate yarns in the bonding yarn.
4. A yarn according to claim 2 including 3 to 10 aggregate yarns in the bonding yarn.
5. A yarn according to claim 1, 2 or 3 wherein the adhesive is a thermoplastic adhesive capable of being bonded to a veneer surface by heat and pressure.
6. Veneers bonded using a bonding yarn according to claim 1, 2 or 3.
7. Veneers bonded using a bonding yarn according to claim 1, 2 or 3 wherein the adhesive is a thermoplastic adhesive capable of being bonded to a veneer surface by heat and pressure.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3440880A JPS5849367B2 (en) | 1980-03-17 | 1980-03-17 | Adhesive thread for veneer veneer |
| JP34408/1980 | 1980-03-17 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1173339A true CA1173339A (en) | 1984-08-28 |
Family
ID=12413355
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000373172A Expired CA1173339A (en) | 1980-03-17 | 1981-03-17 | Bonding tape for veneers |
Country Status (3)
| Country | Link |
|---|---|
| JP (1) | JPS5849367B2 (en) |
| CA (1) | CA1173339A (en) |
| GB (1) | GB2071722B (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59118126U (en) * | 1983-01-26 | 1984-08-09 | 松下電器産業株式会社 | disk-shaped recording medium |
| JPS6064476U (en) * | 1983-10-11 | 1985-05-07 | ソニー株式会社 | Center core in magnetic disk device |
| JPS60125980A (en) * | 1983-12-09 | 1985-07-05 | Hitachi Maxell Ltd | Disc cartridge |
| DK8289A (en) * | 1988-01-12 | 1989-07-13 | Raychem Ltd | COMPOSITE |
-
1980
- 1980-03-17 JP JP3440880A patent/JPS5849367B2/en not_active Expired
-
1981
- 1981-03-17 CA CA000373172A patent/CA1173339A/en not_active Expired
- 1981-03-17 GB GB8108306A patent/GB2071722B/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| JPS56130303A (en) | 1981-10-13 |
| GB2071722A (en) | 1981-09-23 |
| JPS5849367B2 (en) | 1983-11-04 |
| GB2071722B (en) | 1983-11-23 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |