CA2025867A1 - Method and apparatus for manufacturing corrugated boards - Google Patents
Method and apparatus for manufacturing corrugated boardsInfo
- Publication number
- CA2025867A1 CA2025867A1 CA 2025867 CA2025867A CA2025867A1 CA 2025867 A1 CA2025867 A1 CA 2025867A1 CA 2025867 CA2025867 CA 2025867 CA 2025867 A CA2025867 A CA 2025867A CA 2025867 A1 CA2025867 A1 CA 2025867A1
- Authority
- CA
- Canada
- Prior art keywords
- flute
- facer
- fluting
- corrugated board
- types
- 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.)
- Abandoned
Links
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 16
- 238000000034 method Methods 0.000 title abstract description 9
- 230000015572 biosynthetic process Effects 0.000 claims abstract description 12
- 238000010030 laminating Methods 0.000 claims abstract description 7
- 238000011144 upstream manufacturing Methods 0.000 description 15
- 238000005755 formation reaction Methods 0.000 description 9
- 238000004026 adhesive bonding Methods 0.000 description 3
- 238000004806 packaging method and process Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 2
- 229940000425 combination drug Drugs 0.000 description 1
- 235000008504 concentrate Nutrition 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 239000003292 glue Substances 0.000 description 1
- 230000003455 independent Effects 0.000 description 1
- 239000000543 intermediate Substances 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
- B31F—MECHANICAL WORKING OR DEFORMATION OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
- B31F1/00—Mechanical deformation without removing material, e.g. in combination with laminating
- B31F1/20—Corrugating; Corrugating combined with laminating to other layers
- B31F1/24—Making webs in which the channel of each corrugation is transverse to the web feed
- B31F1/26—Making webs in which the channel of each corrugation is transverse to the web feed by interengaging toothed cylinders cylinder constructions
- B31F1/28—Making webs in which the channel of each corrugation is transverse to the web feed by interengaging toothed cylinders cylinder constructions combined with uniting the corrugated webs to flat webs ; Making double-faced corrugated cardboard
- B31F1/2813—Making corrugated cardboard of composite structure, e.g. comprising two or more corrugated layers
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
- B31F—MECHANICAL WORKING OR DEFORMATION OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
- B31F1/00—Mechanical deformation without removing material, e.g. in combination with laminating
- B31F1/20—Corrugating; Corrugating combined with laminating to other layers
- B31F1/24—Making webs in which the channel of each corrugation is transverse to the web feed
- B31F1/26—Making webs in which the channel of each corrugation is transverse to the web feed by interengaging toothed cylinders cylinder constructions
- B31F1/28—Making webs in which the channel of each corrugation is transverse to the web feed by interengaging toothed cylinders cylinder constructions combined with uniting the corrugated webs to flat webs ; Making double-faced corrugated cardboard
- B31F1/2845—Details, e.g. provisions for drying, moistening, pressing
- B31F1/2863—Corrugating cylinders; Supporting or positioning means therefor; Drives therefor
- B31F1/2868—Exchangeable corrugating cylinders
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Machines For Manufacturing Corrugated Board In Mechanical Paper-Making Processes (AREA)
- Laminated Bodies (AREA)
Abstract
ABSTRACT:
Disclosed is a method and an apparatus for manufacturing a triple wall corrugated board by laminating two single-faced corrugated boards respectively formed by a pair of single facers in a corrugator and also by pasting a liner on one side of the single-faced corrugated board, charac-terized in that: at least one of said pair of single facers is replaced with a single facer having two sets of fluting units with different flute specifications which enables selective formation of different flute types of single-faced corrugated boards by selectively using the desired set of fluting unit; and both of the single facers are simultaneously operated with one of the fluting units with different flute specifications being selectively used so that different types of triple wall corrugated boards can be formed selectively.
Disclosed is a method and an apparatus for manufacturing a triple wall corrugated board by laminating two single-faced corrugated boards respectively formed by a pair of single facers in a corrugator and also by pasting a liner on one side of the single-faced corrugated board, charac-terized in that: at least one of said pair of single facers is replaced with a single facer having two sets of fluting units with different flute specifications which enables selective formation of different flute types of single-faced corrugated boards by selectively using the desired set of fluting unit; and both of the single facers are simultaneously operated with one of the fluting units with different flute specifications being selectively used so that different types of triple wall corrugated boards can be formed selectively.
Description
METHOD AND APPA~ATUS FOR MANUFACTU~ING CORRUGATED BOARDS
BACI~GROUND OF T~IE INVENTION
S This invention relates to a method and an apparatus for manufacturing corrugated boards in a corrugator equipped with a pair of single facers, which have overcome the inconvenience of the conventional corrugators in that they can form only one type of triple wall corrugated board, enabling selective and speedy formation of different types of triple wall corrugated boards without using additional single facers and incidental equipments thereto or in-creasing the length of the corrugator line.
Corrugators are widely employed as an equipment for con-tinuously manufacturing a corrugated board. Generally, corrugated boards to be formed by these corrugators are roughly classified into the following three types: (1) single-faced corrugated boards; (2) double-Eaced corru-gated boards; and (3) triple wall corrugated boards.(Although there is a four-wall corrugated board of special specifications, this type of special specifications will be excluded in this invention.) To describe now briefly the types of corrugated boards, the single faced corru-gated board, as shown in Fig. 4(a), is formed by pasting aliner (12) with one side of a corrugating medium (10) having wavy flutes at the crests of corrugation. The single-faced corrugated boards are predominantly used for the base materlal for forming double-faced or triple wall corrugated boards which will be described later, and they are used as such merely as a cushioning material.
On the other hand, the double-faced corrugated board, as shown in Fig. 4(b), is formed by pasting another liner ~ u h ~i ~J ~ 7 (14) with the other side of the single~faced corrugated board at the crests of corrugation. The double-faced corrugated boards are very frequently used for outer packaging. Triple wall corrugated board, as shown in Fig.
4(c), is formed by laminating a pair of single-faced`
corrugated boards (16, 18) and also by pasting a liner (20) with one single-faced corrugated board (18) at the crests of corrugation. The triple wall corrugated boards are frequently used particularly as outer packaging for heavy materials or as shock-resistant outer packaging.
There are many kinds of flute types Eor the corrugated boards, which are classified into Flute types A, B, C, E, etc. depending on the height of flute and pitch size, as shown in Fig. 5; wherein Flute type A has the smallest flute number per unit length and the greatest flute height to provide excellent cushioning properties; Flute type B
has a flute number of 50 ~ 2 per unit length oP 30 cm, as specified by JIS Z-1516, and usually a flute height of 2.5 to 3.0 mm. Although Flute type B may have inferior cushioning properties to Flute type A, the former charac-teristically has resistance to flat crush, and Flute types A and B are usually used widely in Japan.
Flute type C, which is not standardized by JIS, has inter-mediate characteristics between Flute type A and Flute type B, and has a ~lute number of ~0 ~ 2 per unit length of 30 cm and a flute height of 3.5 to ~.0 mm. In spite of the advantages of Flute type C in that it uses relatively smaller amount of web than in Flute type A (% feed per flute is small) and can provide sufficient strength, it is not popular in Japan due to the historical background of introducing the corrugators, but in Western countries, Flute type C ls used with overwhelming frequency. Flute type E has the finest flutes, i.e. a flute number of 92 to 100 per unit length of 30 cm and a flute height o~ about 1 mm. Incidentally, clear and uniform printing without flute marks is feasible on those liners having finer flutes such as Flute types E and B since pressure can be applied thereto evenly.
While single-faced and double-faced corrugated boards are naturally classified into Flute types A, B, C, ~, etc.
depending on the types of flutes, Flute types A and B are most widely used in Japan as mentioned before. When triple wall corrugated boards are formed, it is of common practice to laminate two different flute types of single-faced cbrrugated boards rather than to laminate those of the same flute type. For example, as shown in Fig. 6, widely known are the following combinations:
(1) combination of Flute types A and B; (2) combination of Flute types B and C, and (3) combination of Flute types B and E. In Japan, user's demands overwhelmingly concen-trate on the triple wall corrugated board comprising the combination of Flute types A and B over the others at present; whereas in the U.S.~., the majority of user's demands are for triple wall corrugated board comprising the combination of Flute types B and C.
As described above, demands for single-faced and double-faced corrugated boards of Flute type A or B and for triple wall corrugated boards comprising the combination of Flute types A and B occupy the greatest majority in the domestic market. Accordingly, most of the corrugators installed in the corrugated board manufacturing plants in our country have a constitution enabling selec-tive forma-tion of a single-faced or double-faced corrugated board.
Namely, as shown schematically in Fig. 3, a conventionally known corrugator (22) is designed to have a pair o~ single facers (24, 26) in the corrugator line; wherein one single facer (24), for example, has fluted rolls (2~, 30) for forming Flute A and the other single facer 26, forexample, h V ~ ~ ) 7 has fluted rolls (32, 34) for forming Flute B.
Accordingly, a single-faced corrugated board of Flute type A or B can be formed by operating either of the two single facers independently, and a double-faced corrugated board can be formed by pasting said single-faced corrugated board with a liner. On the other hand, by operating both of the single facers ~24, 26), a single-faced corrugated board of Flute types A (38) and that of B (40) can be formed simultaneously. These single-faced corrugated boards (38, 40) are laminated together as they pass through a downstream double facer (36) wlth a liner (42) being pasted together with the single-faced corrugated board (40) at the crests of corrugation, whereby a triple wall corrugated board comprising the combination of Flute types A and B (44) can be formed. Incidentally, the reference numeral 46 in the drawings shows a mill roll stand which supplies corrugating medium (48), 50, a mill roll stand which supplies a liner (52); 54, a mill roll stand which supplies a liner (42) for forming triple wall corrugated board (44); 56, a preheater; and 58, a gluing unit.
While in Japan there are great demands for corrugated boards ~of single-faced, double-faced and triple wall types) according to the standards for Flute types ~ and B, as described before, some users recently are trying to introduce (1) single-Eaced corrugated boards and double-faced corrugated boards of Flute type C and ~2) triple wall corrugated boards comprising the combination of Flute types B and C which are predominantly used in Western countries. In such occasions, if corrugated boards of Flute type C is tried to be formed in the same corrugator line, the following inconveniences arise.
To describe in detail, since most of the existing cor-~V~v~J~7 rugators in Japan are equipped with a pair of singlefacers corresponding to Flute types A and B, respectively, it can be contemplated to replace the upper and lower fluted rolls with Flute type A specifications in the single facer by the upper and lower fluted rolls with Flute type C specifications. However, removal and re-placement of fluted rolls require much trouble and time, and besides the the corrugator must be stopped during such operations, impractically. In other words, such system of replacing fluted rolls suffers a disadvantage in that it cannot speedily adapted to the formation of single-faced corrugated boards or double-faced corrugated boards of Flute type A and triple wall corrugated boards comprising the combination of Flute type A and B which are in great-est demand in our country.
It can also be contemplated to additionally installanother single facer corresponding to Flute type C in an existing corrugator equipped with a pair of single facers corresponding to Flute types A and B, respectively. In such occasion, demands for Flute types A, B and C can all be satisfied immediately by operating the corresponding single facer selectively. Elowever, such additional in-stallation of single facer only is not sufficient, but it also requires a pair of splicers which splice webs, a pair of mill roll stands and a pair of preheaters for moisture adjustment as incidental equipments. ThereEore, this system also involves a number of practical problems in that it not only requires tremendous cost Eor the equip-ment but also inevitably increases the whole length of thecorrugator line to require larger insta:Llation space in the plant.
In an attempt to find a suitable solution for such problems under such circumstances, the present inventors have found that such problems can be overcome by intro-t ~ U i~
ducing a single facer having two sets oE fluting unitswith different Elute specifications into a corrugator, which enables selective formation of different types of single-faced corrugated boards by operating the desired fluting unit. Namely, this invention has been proposed in view of the above problems inherent in the manufacture of corrugated boards and for the purpose of solving them suitably, and is directed to provide a novel means for forming different types of triple wall corrugated board selectively by suitably using a single facer having two sets of fluting units with different flute specifications, respectively, without using an additional single facer or incidental equipments or increasing the length of the corrugator line.
SUMMARY OF THE INVENTION
In order to solve the above problems and achieve the intended object suitably, one aspect of this invention is to provide a method of manufacturing a triple wall corru-gated board by laminating two single-faced corrugated boards respectively formed by a pair of single facers in a corrugator and also by pasting a liner on one side of the single-faced corrugated board, characterized in that:
at least one of said pair of single facers is re-placed with a single facer having two sets o~ fluting units with different flute specifications which enables selective formation of different flute types of single-faced corrugated boards by selectively using the desired 0 set of fluting unit; and both of the single facers are simultaneously operated with one of the fluting units with different flute speci-fications bein~ seleckively used so that different types of triple wall corrugated boards can be formed selec-tively.
s `~
Another aspect of this invention for overcoming the above problems is ~o provide an apparatus for manufacturing a triple wall corrugated board in a corrugator having a pair of single facers by laminating two single-faced corrugated boards formed by the respective single facers, characte-rized in that:
at least one of said pair of single facers is re-placed with a single facer having two sets of fluting units with different flute specifications, which enables selective formation of different flute types of single-faced corrugated boards by selectively using the desired set of fluting unit.
As has been described heretofore, according to the present method and apparatus for manufacturing corrugated boards, different types of triple wall corrugated boards can selectively be formed speedily overcoming the problem of the conventional corrugator equipped with a pair of single facers which can only cope with manufacture of only one type of triple wall corrugated board. Because of such constitution, a triple wall corrugated board (e.g. com-prising the combination of Flute types A and B) in the greatest user's demand can usually be formed, and as necessary, by selective shifting between the first fluting unit and the second fluting unit in a so-called twin facer, the present unit can easily and speedily be adapted to the formation of a different type oE triple wall cor-rugated board (e.g. comprising the combination of Flute types B and C). Particularly, Flute type C is advanta-geous in that it can be formed with a smaller amount oweb feed and that it can afford sufficient strength as described before. Accordingly, the greates~ advantage of the present apparatus is that it can also cope with Flute types B and/or C which are in great demand in Western countries as well as Flute type A and/or B even in those countries where the majority of user's demands are for f~ 7 Flute type A and/or B corrugated boards like in Japan.
Moreover, according to the method and apparatus of this invention, no additional single facer corresponding to another flute specifications, so that no incidental equip-ment is required. Accordingly, the present method and apparatus can be introduced into the limited conventional space of the existing system in the plant without in-creasing the length of the corrugator line. From the standpoint of facility investment, the present apparatus is very economical since expenditure can be held minimum since the conventional single facer is replaced by the single facer having two sets of fluting units (so-called twin facer) and no incidental e~uipments such as splicers, mill roll stands, preheaters and the like are required.
BRIEF DESCRIPTION OF THE DRAWINGS
Fig. 1 schematically shows a constitution of a corrugator in which the present method of manufacturing corrugated boards can suitably be practiced, Fig. 2 schematically shows a side view of a twin facer to be employed in the corrugator shown in Fig. l;
Fig. 3 schematica]ly shows a constitution of prior art corrugator;
Fig. 4(a) illustrates a single-Eaced corrugated board;
Fig. 4(b) illustrates a double~faced corrugated board, Fig. 4~c) illustrates a triple wall corrugated board, Fig. 5 illustrates various flute types of corrugated boards;
~ V h ~ 7 Fig. 6 illustrates various types of triple wall corrugated boards.
PREFERRED EMBODIMENTS OF THE INVENTION
The method and apparatus of manufacturing corrugated boards according to this invention will now be described by way of preferred embodiments referring to the attached drawings. Fig. 1 schematically shows a constitution of a corrugator in which the present method can suitably be practiced, and detailed description of the basic consti-tution therefor will be omitted, since it is substantially the same as the prior art corrugator shown in Fig. 3.
As shown in Fig. 1, the corrugator (22) has a pair of single facers ~24, 62); wherein one single facer (24) is of the same structure as described for the conventional single facer, and the other single facer (62) has a pair of fluting units (64, 66) to be described later referring to Fig. 2, which are designed to be used selectively. An optimum mode in the single facer (62) is selective shifting between the fluting unit (64) which is designed to correspond with Flute type A and the fluting unit (66) which is designed to correspond with Flute type C, to allow selective formation of a corrugated board of Flute type A or C. It should be noted here that the sing]e facer which can selectively form different types of single faced corrugated boards will hereinafter be referred to as "twin facer" (a registered trade name, owned by the present applicant) to distinguish it from the conventional single facer.
Fig. 2 shows a preferred structure of the twin facer (62) to be employed in the present embodiment. In this twin facer (62), a first fluting unit (64) comprising a pair of "
upper and lower fluted rolls ~70, 72) is disposed dia-gonally above a press roll ~68) which is designed to press a liner ~52) against the glued crests of a corrugating medium ~48); and also (68~ 1 a second fluting unit (66) comprising a pair of upper and lower fluted rolls (74, 76) is disposed immediately below the press roll (68)o In each of the first and second fluting units ~64, 66), a gluing mechanism (84) comprising a gluing roll (78), a doctor roll (80) and a glue pan (82) is disposed.
The press roll (68) is rotatably supported at one end portion of a lever (86) which is pivotally supported on a fixed frame (not shown) with a pin (88)~ The other end portion of the lever (86) is connected to the piston rod (9Oa) of a hydraulic cylinder (90) so that the lever (86) can be urged to turn on the pin (88)~ In other words, by urging selectively the hydraulic cylinder (90) in the positive or negative direction to protrude or retract the piston rod (9Oa), the press roll (68) can be shifted between the ~irst position where it is in abutment with the lower fluted roll (72) of the first fluting unit (64) and the second position where it is in abutment with the lower fluted roll (76) of the second fluting unit (66)~
In the above constitution, provided that the first fluting unit (60 corresponds, for example, with Flute type A (40) and that the second fluting unit (66) with Flute type C, the following corrugated boards can be formed:
(i) a single-faced corrugated board of Flute type A by 3n the combination of the press roll (68) and the first fluting unit (64); or (ii) a single-faced corruyated board of Flute type C
(40) by the combination of the press roll (68) and the second Eluting unit ( 66) ~
It should be noted here that the distinction between the upper fluted roll and the lower fluted roll in the twin h ~J w ~
facer (62) is not made based on the spatial relationship but made relative to the press roll. Namely, it should be appreciated that those fluted rolls which are brought'into press contact with the press roll through the liner and the corrugating medium are referred to as "lower fluted rolls".
In the corrugator t22) according to the optimum mode as shown in Fig. 1, the twin facer (62) which can selectively form Flute type A or C single-faced corrugated board is disposed upstream, and the conventional sinyle facer (24) is disposed downstream in the corrugator line. In this constitution, the single facer (24) must be equipped with fluted rolls t28, 30) of Flute type B specifications having finer flutes than in Flute types A and C, the reason for which is:
(i) it is to the liner which is pasted together with the single-faced corrugated board formed in the single facer disposed downstream the corrugator line that printing is applied to; and ~ ii) clear and uniform printing is feasible on the corrugated board having finer flutes, as described above.
Accordingly, the single facer (24) may be adopted to have fluted rolls of Flute type E specifications having much finer flutes in place of Flute type B specifications.
The pair of mill roll stands ~46) are designed to supply a corrugating medium t48) to each oE the single facers (24) and the twin facer (62), respectively. Another indepen-dent mill roll stand (92) is disposed adjacent to and' downstream the upstream mill roll stand (g6). The liner (42) delivered from the roll (94) of the mill roll stand (92) is fed downstream along and immediately below the deck plate (60) and pasted together through the double facer (36) with the single-faced corrugated board (3~) ~ v ~ 7 formed in the twin facer (62). Another mill roll stand (54) is disposed adjacent to and downstream the downstream single facer (24), and the liner (42) delivered from the roll (96) of this mill roll stand (54) is likewise pasted together through the double facer (36) with the single-faced corrugated board (40) formed in the sin~le facer (2~).
(Function of the embodiment) Typical embodiments of the method of manufacturing cor-rugated boards to be practiced in the corrugator of the constitution shown in Fig. 1 will now be described.
First, it is apparent that a single-faced corrugated board of the corresponding flute specifications can o course be formed by operating the twin facer (62) or the single facer (24) independently. In other words, a single-faced corrugated board with Flute type A specifications (40) can be formed by operating the twin facer (62) independently if the first fluting unit (64) is selected; and a single-faced corrugated board with Flute type C specifications ~40) can be formed, if the second fluting unit (66) is selected. Upon operation of the single facer (24) in-dependently, a single-faced corrugated board with Flute type B specifications can be formed. Further, a double-faced corrugated board of Plute type type A, C or B can be formed by pasting the single-faced corrugated board with the liner (~2).
By simultaneously operatiny the twin facer (62) and the single facer (2~), a triple wall corrugated board can be formed in the same manner as in the conventional cor-rugator. The conventional corrugator is limited to the manufacture of only one type of triple wall corrugated board, for example, comprising the combination of Flute types A and B and cannot immediately cope with formation v ~
of triple wall corrugated board comprising other combina-tions of 1ute types. According to this invention, however, since the first fluting unit (64) is designed to correspond with Flute type A specifications, and the second fluting unit (66) with Flute type C specifications, two types of triple wall corrugated boards can selectively be formed immediately.
In other words, when the hydraulic cylinder (90) shown in Fig. 2 is urging the press roll (68) to be abutted against the lower fluted roll (72) of the first fluting unit (6~), the first fluting unit (64) is selectively used. If the twin facer (62) and the single facer (24) are simultane-ously operated in such state, a Flute type A single-faced corrugated board (40) can be formed through the twin facer ~62); while through the single facer ~24), a Flute type B
single-faced corrugated ~oard (38). Accordingly, by laminating the Flute type A single-faced corrugated board (40) with the Flute type B single-faced corrugated board (38) together with the liner (42), a triple wall cor-rugated board comprising the combination of Flute types A
and B (44) can be formed. This type of triple wall cor-rugated board is in greatest demand in our country.
On the other hand, if the hydraulic cylinder (90) shown in Fig. 2 is operated reversely to urge the press roll (6~) to be in abutment against the lower fluted roll (76) of the second fluting unit (66), the second fluting unit (66) is now selectively used, so that a Flute type C single-faced corrugated board ~40) is formed through the twinfacer (62). Accordingly, a triple wall corrugated board comprising the combination of Flute types B and C (44) can be formed by ~aminating the Flute type B single-faced corrugated board (38) Eormed through the single facer (24) with the Flute type C single-faced corrugated board (40) together with the liner (42). This type of triple wall r~
~ 14 ~
corrugated board is in greatest demand in Western coun triesr as described above.
As shown in Fig. 1, in the arrangement where the twin facer (62) is disposed upstream, and the single facer ~24) downstream in the corrugator line, for example, the fol-lowing combinations of flute types are possible by se-lecting the flute types in the respective facers (62, 24):
(1) Upstream twin facer: C and B
Downstream single facer: E
Triple wall corrugated board formed: C/E or B/E
BACI~GROUND OF T~IE INVENTION
S This invention relates to a method and an apparatus for manufacturing corrugated boards in a corrugator equipped with a pair of single facers, which have overcome the inconvenience of the conventional corrugators in that they can form only one type of triple wall corrugated board, enabling selective and speedy formation of different types of triple wall corrugated boards without using additional single facers and incidental equipments thereto or in-creasing the length of the corrugator line.
Corrugators are widely employed as an equipment for con-tinuously manufacturing a corrugated board. Generally, corrugated boards to be formed by these corrugators are roughly classified into the following three types: (1) single-faced corrugated boards; (2) double-Eaced corru-gated boards; and (3) triple wall corrugated boards.(Although there is a four-wall corrugated board of special specifications, this type of special specifications will be excluded in this invention.) To describe now briefly the types of corrugated boards, the single faced corru-gated board, as shown in Fig. 4(a), is formed by pasting aliner (12) with one side of a corrugating medium (10) having wavy flutes at the crests of corrugation. The single-faced corrugated boards are predominantly used for the base materlal for forming double-faced or triple wall corrugated boards which will be described later, and they are used as such merely as a cushioning material.
On the other hand, the double-faced corrugated board, as shown in Fig. 4(b), is formed by pasting another liner ~ u h ~i ~J ~ 7 (14) with the other side of the single~faced corrugated board at the crests of corrugation. The double-faced corrugated boards are very frequently used for outer packaging. Triple wall corrugated board, as shown in Fig.
4(c), is formed by laminating a pair of single-faced`
corrugated boards (16, 18) and also by pasting a liner (20) with one single-faced corrugated board (18) at the crests of corrugation. The triple wall corrugated boards are frequently used particularly as outer packaging for heavy materials or as shock-resistant outer packaging.
There are many kinds of flute types Eor the corrugated boards, which are classified into Flute types A, B, C, E, etc. depending on the height of flute and pitch size, as shown in Fig. 5; wherein Flute type A has the smallest flute number per unit length and the greatest flute height to provide excellent cushioning properties; Flute type B
has a flute number of 50 ~ 2 per unit length oP 30 cm, as specified by JIS Z-1516, and usually a flute height of 2.5 to 3.0 mm. Although Flute type B may have inferior cushioning properties to Flute type A, the former charac-teristically has resistance to flat crush, and Flute types A and B are usually used widely in Japan.
Flute type C, which is not standardized by JIS, has inter-mediate characteristics between Flute type A and Flute type B, and has a ~lute number of ~0 ~ 2 per unit length of 30 cm and a flute height of 3.5 to ~.0 mm. In spite of the advantages of Flute type C in that it uses relatively smaller amount of web than in Flute type A (% feed per flute is small) and can provide sufficient strength, it is not popular in Japan due to the historical background of introducing the corrugators, but in Western countries, Flute type C ls used with overwhelming frequency. Flute type E has the finest flutes, i.e. a flute number of 92 to 100 per unit length of 30 cm and a flute height o~ about 1 mm. Incidentally, clear and uniform printing without flute marks is feasible on those liners having finer flutes such as Flute types E and B since pressure can be applied thereto evenly.
While single-faced and double-faced corrugated boards are naturally classified into Flute types A, B, C, ~, etc.
depending on the types of flutes, Flute types A and B are most widely used in Japan as mentioned before. When triple wall corrugated boards are formed, it is of common practice to laminate two different flute types of single-faced cbrrugated boards rather than to laminate those of the same flute type. For example, as shown in Fig. 6, widely known are the following combinations:
(1) combination of Flute types A and B; (2) combination of Flute types B and C, and (3) combination of Flute types B and E. In Japan, user's demands overwhelmingly concen-trate on the triple wall corrugated board comprising the combination of Flute types A and B over the others at present; whereas in the U.S.~., the majority of user's demands are for triple wall corrugated board comprising the combination of Flute types B and C.
As described above, demands for single-faced and double-faced corrugated boards of Flute type A or B and for triple wall corrugated boards comprising the combination of Flute types A and B occupy the greatest majority in the domestic market. Accordingly, most of the corrugators installed in the corrugated board manufacturing plants in our country have a constitution enabling selec-tive forma-tion of a single-faced or double-faced corrugated board.
Namely, as shown schematically in Fig. 3, a conventionally known corrugator (22) is designed to have a pair o~ single facers (24, 26) in the corrugator line; wherein one single facer (24), for example, has fluted rolls (2~, 30) for forming Flute A and the other single facer 26, forexample, h V ~ ~ ) 7 has fluted rolls (32, 34) for forming Flute B.
Accordingly, a single-faced corrugated board of Flute type A or B can be formed by operating either of the two single facers independently, and a double-faced corrugated board can be formed by pasting said single-faced corrugated board with a liner. On the other hand, by operating both of the single facers ~24, 26), a single-faced corrugated board of Flute types A (38) and that of B (40) can be formed simultaneously. These single-faced corrugated boards (38, 40) are laminated together as they pass through a downstream double facer (36) wlth a liner (42) being pasted together with the single-faced corrugated board (40) at the crests of corrugation, whereby a triple wall corrugated board comprising the combination of Flute types A and B (44) can be formed. Incidentally, the reference numeral 46 in the drawings shows a mill roll stand which supplies corrugating medium (48), 50, a mill roll stand which supplies a liner (52); 54, a mill roll stand which supplies a liner (42) for forming triple wall corrugated board (44); 56, a preheater; and 58, a gluing unit.
While in Japan there are great demands for corrugated boards ~of single-faced, double-faced and triple wall types) according to the standards for Flute types ~ and B, as described before, some users recently are trying to introduce (1) single-Eaced corrugated boards and double-faced corrugated boards of Flute type C and ~2) triple wall corrugated boards comprising the combination of Flute types B and C which are predominantly used in Western countries. In such occasions, if corrugated boards of Flute type C is tried to be formed in the same corrugator line, the following inconveniences arise.
To describe in detail, since most of the existing cor-~V~v~J~7 rugators in Japan are equipped with a pair of singlefacers corresponding to Flute types A and B, respectively, it can be contemplated to replace the upper and lower fluted rolls with Flute type A specifications in the single facer by the upper and lower fluted rolls with Flute type C specifications. However, removal and re-placement of fluted rolls require much trouble and time, and besides the the corrugator must be stopped during such operations, impractically. In other words, such system of replacing fluted rolls suffers a disadvantage in that it cannot speedily adapted to the formation of single-faced corrugated boards or double-faced corrugated boards of Flute type A and triple wall corrugated boards comprising the combination of Flute type A and B which are in great-est demand in our country.
It can also be contemplated to additionally installanother single facer corresponding to Flute type C in an existing corrugator equipped with a pair of single facers corresponding to Flute types A and B, respectively. In such occasion, demands for Flute types A, B and C can all be satisfied immediately by operating the corresponding single facer selectively. Elowever, such additional in-stallation of single facer only is not sufficient, but it also requires a pair of splicers which splice webs, a pair of mill roll stands and a pair of preheaters for moisture adjustment as incidental equipments. ThereEore, this system also involves a number of practical problems in that it not only requires tremendous cost Eor the equip-ment but also inevitably increases the whole length of thecorrugator line to require larger insta:Llation space in the plant.
In an attempt to find a suitable solution for such problems under such circumstances, the present inventors have found that such problems can be overcome by intro-t ~ U i~
ducing a single facer having two sets oE fluting unitswith different Elute specifications into a corrugator, which enables selective formation of different types of single-faced corrugated boards by operating the desired fluting unit. Namely, this invention has been proposed in view of the above problems inherent in the manufacture of corrugated boards and for the purpose of solving them suitably, and is directed to provide a novel means for forming different types of triple wall corrugated board selectively by suitably using a single facer having two sets of fluting units with different flute specifications, respectively, without using an additional single facer or incidental equipments or increasing the length of the corrugator line.
SUMMARY OF THE INVENTION
In order to solve the above problems and achieve the intended object suitably, one aspect of this invention is to provide a method of manufacturing a triple wall corru-gated board by laminating two single-faced corrugated boards respectively formed by a pair of single facers in a corrugator and also by pasting a liner on one side of the single-faced corrugated board, characterized in that:
at least one of said pair of single facers is re-placed with a single facer having two sets o~ fluting units with different flute specifications which enables selective formation of different flute types of single-faced corrugated boards by selectively using the desired 0 set of fluting unit; and both of the single facers are simultaneously operated with one of the fluting units with different flute speci-fications bein~ seleckively used so that different types of triple wall corrugated boards can be formed selec-tively.
s `~
Another aspect of this invention for overcoming the above problems is ~o provide an apparatus for manufacturing a triple wall corrugated board in a corrugator having a pair of single facers by laminating two single-faced corrugated boards formed by the respective single facers, characte-rized in that:
at least one of said pair of single facers is re-placed with a single facer having two sets of fluting units with different flute specifications, which enables selective formation of different flute types of single-faced corrugated boards by selectively using the desired set of fluting unit.
As has been described heretofore, according to the present method and apparatus for manufacturing corrugated boards, different types of triple wall corrugated boards can selectively be formed speedily overcoming the problem of the conventional corrugator equipped with a pair of single facers which can only cope with manufacture of only one type of triple wall corrugated board. Because of such constitution, a triple wall corrugated board (e.g. com-prising the combination of Flute types A and B) in the greatest user's demand can usually be formed, and as necessary, by selective shifting between the first fluting unit and the second fluting unit in a so-called twin facer, the present unit can easily and speedily be adapted to the formation of a different type oE triple wall cor-rugated board (e.g. comprising the combination of Flute types B and C). Particularly, Flute type C is advanta-geous in that it can be formed with a smaller amount oweb feed and that it can afford sufficient strength as described before. Accordingly, the greates~ advantage of the present apparatus is that it can also cope with Flute types B and/or C which are in great demand in Western countries as well as Flute type A and/or B even in those countries where the majority of user's demands are for f~ 7 Flute type A and/or B corrugated boards like in Japan.
Moreover, according to the method and apparatus of this invention, no additional single facer corresponding to another flute specifications, so that no incidental equip-ment is required. Accordingly, the present method and apparatus can be introduced into the limited conventional space of the existing system in the plant without in-creasing the length of the corrugator line. From the standpoint of facility investment, the present apparatus is very economical since expenditure can be held minimum since the conventional single facer is replaced by the single facer having two sets of fluting units (so-called twin facer) and no incidental e~uipments such as splicers, mill roll stands, preheaters and the like are required.
BRIEF DESCRIPTION OF THE DRAWINGS
Fig. 1 schematically shows a constitution of a corrugator in which the present method of manufacturing corrugated boards can suitably be practiced, Fig. 2 schematically shows a side view of a twin facer to be employed in the corrugator shown in Fig. l;
Fig. 3 schematica]ly shows a constitution of prior art corrugator;
Fig. 4(a) illustrates a single-Eaced corrugated board;
Fig. 4(b) illustrates a double~faced corrugated board, Fig. 4~c) illustrates a triple wall corrugated board, Fig. 5 illustrates various flute types of corrugated boards;
~ V h ~ 7 Fig. 6 illustrates various types of triple wall corrugated boards.
PREFERRED EMBODIMENTS OF THE INVENTION
The method and apparatus of manufacturing corrugated boards according to this invention will now be described by way of preferred embodiments referring to the attached drawings. Fig. 1 schematically shows a constitution of a corrugator in which the present method can suitably be practiced, and detailed description of the basic consti-tution therefor will be omitted, since it is substantially the same as the prior art corrugator shown in Fig. 3.
As shown in Fig. 1, the corrugator (22) has a pair of single facers ~24, 62); wherein one single facer (24) is of the same structure as described for the conventional single facer, and the other single facer (62) has a pair of fluting units (64, 66) to be described later referring to Fig. 2, which are designed to be used selectively. An optimum mode in the single facer (62) is selective shifting between the fluting unit (64) which is designed to correspond with Flute type A and the fluting unit (66) which is designed to correspond with Flute type C, to allow selective formation of a corrugated board of Flute type A or C. It should be noted here that the sing]e facer which can selectively form different types of single faced corrugated boards will hereinafter be referred to as "twin facer" (a registered trade name, owned by the present applicant) to distinguish it from the conventional single facer.
Fig. 2 shows a preferred structure of the twin facer (62) to be employed in the present embodiment. In this twin facer (62), a first fluting unit (64) comprising a pair of "
upper and lower fluted rolls ~70, 72) is disposed dia-gonally above a press roll ~68) which is designed to press a liner ~52) against the glued crests of a corrugating medium ~48); and also (68~ 1 a second fluting unit (66) comprising a pair of upper and lower fluted rolls (74, 76) is disposed immediately below the press roll (68)o In each of the first and second fluting units ~64, 66), a gluing mechanism (84) comprising a gluing roll (78), a doctor roll (80) and a glue pan (82) is disposed.
The press roll (68) is rotatably supported at one end portion of a lever (86) which is pivotally supported on a fixed frame (not shown) with a pin (88)~ The other end portion of the lever (86) is connected to the piston rod (9Oa) of a hydraulic cylinder (90) so that the lever (86) can be urged to turn on the pin (88)~ In other words, by urging selectively the hydraulic cylinder (90) in the positive or negative direction to protrude or retract the piston rod (9Oa), the press roll (68) can be shifted between the ~irst position where it is in abutment with the lower fluted roll (72) of the first fluting unit (64) and the second position where it is in abutment with the lower fluted roll (76) of the second fluting unit (66)~
In the above constitution, provided that the first fluting unit (60 corresponds, for example, with Flute type A (40) and that the second fluting unit (66) with Flute type C, the following corrugated boards can be formed:
(i) a single-faced corrugated board of Flute type A by 3n the combination of the press roll (68) and the first fluting unit (64); or (ii) a single-faced corruyated board of Flute type C
(40) by the combination of the press roll (68) and the second Eluting unit ( 66) ~
It should be noted here that the distinction between the upper fluted roll and the lower fluted roll in the twin h ~J w ~
facer (62) is not made based on the spatial relationship but made relative to the press roll. Namely, it should be appreciated that those fluted rolls which are brought'into press contact with the press roll through the liner and the corrugating medium are referred to as "lower fluted rolls".
In the corrugator t22) according to the optimum mode as shown in Fig. 1, the twin facer (62) which can selectively form Flute type A or C single-faced corrugated board is disposed upstream, and the conventional sinyle facer (24) is disposed downstream in the corrugator line. In this constitution, the single facer (24) must be equipped with fluted rolls t28, 30) of Flute type B specifications having finer flutes than in Flute types A and C, the reason for which is:
(i) it is to the liner which is pasted together with the single-faced corrugated board formed in the single facer disposed downstream the corrugator line that printing is applied to; and ~ ii) clear and uniform printing is feasible on the corrugated board having finer flutes, as described above.
Accordingly, the single facer (24) may be adopted to have fluted rolls of Flute type E specifications having much finer flutes in place of Flute type B specifications.
The pair of mill roll stands ~46) are designed to supply a corrugating medium t48) to each oE the single facers (24) and the twin facer (62), respectively. Another indepen-dent mill roll stand (92) is disposed adjacent to and' downstream the upstream mill roll stand (g6). The liner (42) delivered from the roll (94) of the mill roll stand (92) is fed downstream along and immediately below the deck plate (60) and pasted together through the double facer (36) with the single-faced corrugated board (3~) ~ v ~ 7 formed in the twin facer (62). Another mill roll stand (54) is disposed adjacent to and downstream the downstream single facer (24), and the liner (42) delivered from the roll (96) of this mill roll stand (54) is likewise pasted together through the double facer (36) with the single-faced corrugated board (40) formed in the sin~le facer (2~).
(Function of the embodiment) Typical embodiments of the method of manufacturing cor-rugated boards to be practiced in the corrugator of the constitution shown in Fig. 1 will now be described.
First, it is apparent that a single-faced corrugated board of the corresponding flute specifications can o course be formed by operating the twin facer (62) or the single facer (24) independently. In other words, a single-faced corrugated board with Flute type A specifications (40) can be formed by operating the twin facer (62) independently if the first fluting unit (64) is selected; and a single-faced corrugated board with Flute type C specifications ~40) can be formed, if the second fluting unit (66) is selected. Upon operation of the single facer (24) in-dependently, a single-faced corrugated board with Flute type B specifications can be formed. Further, a double-faced corrugated board of Plute type type A, C or B can be formed by pasting the single-faced corrugated board with the liner (~2).
By simultaneously operatiny the twin facer (62) and the single facer (2~), a triple wall corrugated board can be formed in the same manner as in the conventional cor-rugator. The conventional corrugator is limited to the manufacture of only one type of triple wall corrugated board, for example, comprising the combination of Flute types A and B and cannot immediately cope with formation v ~
of triple wall corrugated board comprising other combina-tions of 1ute types. According to this invention, however, since the first fluting unit (64) is designed to correspond with Flute type A specifications, and the second fluting unit (66) with Flute type C specifications, two types of triple wall corrugated boards can selectively be formed immediately.
In other words, when the hydraulic cylinder (90) shown in Fig. 2 is urging the press roll (68) to be abutted against the lower fluted roll (72) of the first fluting unit (6~), the first fluting unit (64) is selectively used. If the twin facer (62) and the single facer (24) are simultane-ously operated in such state, a Flute type A single-faced corrugated board (40) can be formed through the twin facer ~62); while through the single facer ~24), a Flute type B
single-faced corrugated ~oard (38). Accordingly, by laminating the Flute type A single-faced corrugated board (40) with the Flute type B single-faced corrugated board (38) together with the liner (42), a triple wall cor-rugated board comprising the combination of Flute types A
and B (44) can be formed. This type of triple wall cor-rugated board is in greatest demand in our country.
On the other hand, if the hydraulic cylinder (90) shown in Fig. 2 is operated reversely to urge the press roll (6~) to be in abutment against the lower fluted roll (76) of the second fluting unit (66), the second fluting unit (66) is now selectively used, so that a Flute type C single-faced corrugated board ~40) is formed through the twinfacer (62). Accordingly, a triple wall corrugated board comprising the combination of Flute types B and C (44) can be formed by ~aminating the Flute type B single-faced corrugated board (38) Eormed through the single facer (24) with the Flute type C single-faced corrugated board (40) together with the liner (42). This type of triple wall r~
~ 14 ~
corrugated board is in greatest demand in Western coun triesr as described above.
As shown in Fig. 1, in the arrangement where the twin facer (62) is disposed upstream, and the single facer ~24) downstream in the corrugator line, for example, the fol-lowing combinations of flute types are possible by se-lecting the flute types in the respective facers (62, 24):
(1) Upstream twin facer: C and B
Downstream single facer: E
Triple wall corrugated board formed: C/E or B/E
(2) Upstream twin facer: A and B
Downstream single facer~ E
Triple wall corrugated board formed: A/E or B/E
(First variation) The embodiment shown in Fig. 1 comprises a twin facer (62) disposed upstream and a single facer (24) dispoed down-stream in the corrugator line. Besides the above, another arrangement where twin facers are disposed upstream and downstream (i.e. the pair of single facers in the conven-tional corrugator are replaced with twin facers) is possible. In such arrangement, the following combinations are possible:
(1) Upstream twin facer. A and B
Downstream twin facer: C and E
Triple wall corrugated board formed: A/C~ A/E~
B/C or B/E
(2) Upstream twin facer: A and C
Downstream twin facer: B and E
Triple wall corrugated board formed: A/B, A/E, ~ U
B/C or C/E
Downstream single facer~ E
Triple wall corrugated board formed: A/E or B/E
(First variation) The embodiment shown in Fig. 1 comprises a twin facer (62) disposed upstream and a single facer (24) dispoed down-stream in the corrugator line. Besides the above, another arrangement where twin facers are disposed upstream and downstream (i.e. the pair of single facers in the conven-tional corrugator are replaced with twin facers) is possible. In such arrangement, the following combinations are possible:
(1) Upstream twin facer. A and B
Downstream twin facer: C and E
Triple wall corrugated board formed: A/C~ A/E~
B/C or B/E
(2) Upstream twin facer: A and C
Downstream twin facer: B and E
Triple wall corrugated board formed: A/B, A/E, ~ U
B/C or C/E
(3) Upstream twin facer: C and B
Downstream twin facer: B and E
Triple wall corruga~ed board formed: B/C, C/E, B/B or B/E
S4) Upstream twin facer: A and C
Downstream twin facer: C and B
Triple wall corrugated board formed: A/C, A/B, C/C or B/C
(Second variation) The arrangement of the embodiment shown in Fig. 1 may otherwise be reversed, i.e. the single facer (24) may be disposed upstream and the twin facer (62) downstream in the corrugator line. In such arrangement, the following combinations are possible:
~1) Upstream single facer: A
Downstream twin facer: C and B
Triple wall corrugated board formed: A/C or A/B
(2) Upstream single facer: C
Downstream twin facer: B and E
Triple wall corrugated board formed: B/C or C/E
In any of the above arrangements, it is necessary to employ an arrangement where the single-faced corrugated board fed from the downstream facer has finer flutes than those of the single-faced corrugated board fed from the upstream facer in order to facilitate clear and uniform printing on the final corrugated board. Namely, the single-faced corrugated board to be formed in the down-stream facer is preferably of Flute type B or C.
h SJ h~ t~3 Incidentally, the twin facer (62) to be employed according to this invention may not be limited to the unit of the constitution as shown in Fig. 2 and may be of a system having a fixed press roll and a plurality of fluting units which can be moved straight toward or away from the press roll, and can selectively be used. Further, the present invention can suitably be practiced by using a system where a plurality of fluting units are mounted on a rotary frame, and the desired fluting unit may be selected by rotating the frame to use it in combination with the press roll, to form a corrugated board therebetween.
Downstream twin facer: B and E
Triple wall corruga~ed board formed: B/C, C/E, B/B or B/E
S4) Upstream twin facer: A and C
Downstream twin facer: C and B
Triple wall corrugated board formed: A/C, A/B, C/C or B/C
(Second variation) The arrangement of the embodiment shown in Fig. 1 may otherwise be reversed, i.e. the single facer (24) may be disposed upstream and the twin facer (62) downstream in the corrugator line. In such arrangement, the following combinations are possible:
~1) Upstream single facer: A
Downstream twin facer: C and B
Triple wall corrugated board formed: A/C or A/B
(2) Upstream single facer: C
Downstream twin facer: B and E
Triple wall corrugated board formed: B/C or C/E
In any of the above arrangements, it is necessary to employ an arrangement where the single-faced corrugated board fed from the downstream facer has finer flutes than those of the single-faced corrugated board fed from the upstream facer in order to facilitate clear and uniform printing on the final corrugated board. Namely, the single-faced corrugated board to be formed in the down-stream facer is preferably of Flute type B or C.
h SJ h~ t~3 Incidentally, the twin facer (62) to be employed according to this invention may not be limited to the unit of the constitution as shown in Fig. 2 and may be of a system having a fixed press roll and a plurality of fluting units which can be moved straight toward or away from the press roll, and can selectively be used. Further, the present invention can suitably be practiced by using a system where a plurality of fluting units are mounted on a rotary frame, and the desired fluting unit may be selected by rotating the frame to use it in combination with the press roll, to form a corrugated board therebetween.
Claims (2)
1. A method of manufacturing a triple wall corrugated board by laminating two single-faced corrugated boards respectively formed by a pair of single facers in a corrugator and also by pasting a liner on one side of the single-faced corrugated board, characterized in that:
at least one of said pair of single facers is re-placed with a single facer having two sets of fluting units with different flute specifications which enables selective formation of different flute types of single-faced corrugated boards by selectively using the desired set of fluting unit; and both of the single facers are simultaneously operated with one of the fluting units with different flute speci-fications being selectively used so that different types of triple wall corrugated boards can be formed selec-tively.
at least one of said pair of single facers is re-placed with a single facer having two sets of fluting units with different flute specifications which enables selective formation of different flute types of single-faced corrugated boards by selectively using the desired set of fluting unit; and both of the single facers are simultaneously operated with one of the fluting units with different flute speci-fications being selectively used so that different types of triple wall corrugated boards can be formed selec-tively.
2. An apparatus for manufacturing a triple wall corru-gated board in a corrugator having a pair of single facers by laminating two single-faced corrugated boards formed by the respective single facers, characterized in that:
at least one of said pair of single facers is re-placed with a single facer having two sets of fluting units with different flute specifications, which enables selective formation of different flute types of single-faced corrugated boards by selectively using the desired set of fluting unit.
at least one of said pair of single facers is re-placed with a single facer having two sets of fluting units with different flute specifications, which enables selective formation of different flute types of single-faced corrugated boards by selectively using the desired set of fluting unit.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1-247664 | 1989-09-21 | ||
| JP24766489A JPH03108530A (en) | 1989-09-21 | 1989-09-21 | Method and device for producing corrugated board |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2025867A1 true CA2025867A1 (en) | 1991-03-22 |
Family
ID=17166832
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA 2025867 Abandoned CA2025867A1 (en) | 1989-09-21 | 1990-09-20 | Method and apparatus for manufacturing corrugated boards |
Country Status (3)
| Country | Link |
|---|---|
| JP (1) | JPH03108530A (en) |
| CA (1) | CA2025867A1 (en) |
| FR (1) | FR2652035B1 (en) |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106378965A (en) * | 2016-05-09 | 2017-02-08 | 昆山鸣朋纸业有限公司 | Cracking-free production process for paperboard |
| CN110126426A (en) * | 2019-05-14 | 2019-08-16 | 东莞顺裕纸业有限公司 | Manufacturing process of waterproof high-strength composite vertical corrugated board |
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| JPH04132931U (en) * | 1991-05-28 | 1992-12-10 | ハマダ印刷機械株式会社 | Corrugated sheet manufacturing equipment |
| EP0869865A1 (en) * | 1996-10-30 | 1998-10-14 | Best Carton, Ltd. | Production of corrugated board structures |
| DE29802833U1 (en) * | 1998-02-19 | 1998-05-07 | Imer, Rodney Haydn, Barcelona, Vallvidrera | Composite film, in particular for the production of packaging bags, and packaging bags produced from such a composite film |
| KR100356520B1 (en) * | 1999-09-01 | 2002-10-18 | 엘지 오티스 엘리베이터 유한회사 | Lubrication structure for deceleration machine bearing |
| GB0024792D0 (en) * | 2000-10-10 | 2000-11-22 | Linpac Containers Ltd | Board |
| DE102009017744A1 (en) | 2009-04-17 | 2010-12-16 | Bhs Corrugated Maschinen- Und Anlagenbau Gmbh | Multi-ply corrugated board |
| US8652613B2 (en) | 2010-02-09 | 2014-02-18 | Master-Pack Sdn. Bhn. | Quadruple-wall corrugated paperboard and method of manufacture |
| FR2956352B1 (en) * | 2010-02-12 | 2013-03-01 | Master Pack Sdn Bhd | QUADRUPLE CANNELURE QUADRUPTON CARDBOARD AND MANUFACTURING METHOD THEREOF |
| CN104589707A (en) * | 2015-01-21 | 2015-05-06 | 禾义（苏州）新型包装材料有限公司 | Production method of grass core board |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3117095C2 (en) * | 1981-04-30 | 1983-07-21 | Europa Carton Ag, 2000 Hamburg | Process for the production of parts with corrugated cardboard covered on both sides as well as press or stamping deformable corrugated cardboard semi-finished product for the production of dimensionally stable finished product parts |
| JPS613669A (en) * | 1984-06-19 | 1986-01-09 | Mitsubishi Electric Corp | Teig arc welding starting device |
| JPS61141537A (en) * | 1984-12-14 | 1986-06-28 | レンゴ−株式会社 | Single facer |
| JPS62214945A (en) * | 1986-03-17 | 1987-09-21 | 株式会社イソワ | Production unit for single-sided corrugated board |
| DE3630556A1 (en) * | 1986-09-08 | 1988-03-10 | Bhs Bayerische Berg | One-sided corrugated-board machine |
| DE3635643C1 (en) * | 1986-10-20 | 1987-12-10 | Peters W Maschf | One-sided corrugated-board machine |
| DE3635638C1 (en) * | 1986-10-20 | 1988-04-07 | Peters W Maschf | One-sided corrugated-board machine |
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1989
- 1989-09-21 JP JP24766489A patent/JPH03108530A/en active Pending
-
1990
- 1990-09-20 CA CA 2025867 patent/CA2025867A1/en not_active Abandoned
- 1990-09-21 FR FR9011691A patent/FR2652035B1/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106378965A (en) * | 2016-05-09 | 2017-02-08 | 昆山鸣朋纸业有限公司 | Cracking-free production process for paperboard |
| CN110126426A (en) * | 2019-05-14 | 2019-08-16 | 东莞顺裕纸业有限公司 | Manufacturing process of waterproof high-strength composite vertical corrugated board |
Also Published As
| Publication number | Publication date |
|---|---|
| FR2652035A1 (en) | 1991-03-22 |
| JPH03108530A (en) | 1991-05-08 |
| FR2652035B1 (en) | 1995-05-12 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| FZDE | Dead |