JPH072394A - Method and device for winding up in coreless form - Google Patents

Abstract

PURPOSE: To facilitate the manufacture of a coreless product by alternately carrying out a step of directly winding a web onto one of two winding mandrels and a step of pulling a log which has been already wound from another one of the mandrels so as to cut the log at predetermined dimensions during the pulling step. CONSTITUTION: A web W such as toilet tissue which travels while it is engaged with a perforated roll, is formed with crosswise perforations through the operation of a stationary knife plate 11, and then travels around a main bed roll 12 so as to be conveyed to a mandrel 15' located at a position B. This web W is wound around the mandrel 15' supported on a pair of winding drums 17', 18' on an arm 16' which travels in a direction away from the bead roll 12 as the web W is wound, and when a log L having a diameter which becomes a predetermined value by the winding of the web W is formed, the arm 16' is swung to a position 16" where the log L is pulled out. Further during this extraction, the winding of the web is started on the other mandrel 15.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to a coreless winding method and apparatus, and more particularly to the use of small diameter mandrels continuously to form coreless products for forming retail size logs from oversized parent rolls. Regarding what to manufacture.

[0002]

2. Description of the Related Art It is known to manufacture a toilet tissue using a core having an outer surface coated with an adhesive. This has been done whether using a center rewinder or a surface rewinder (see, for example, co-owned patents RE 28353 and 4 respectively).
828195). Traditionally, tissue products have been manufactured on stop / start rewinders using small diameter surface driven mandrels. Yet another method is coreless center winding with a mandrel that breaks after the winding cycle disclosed in GB 1554619, but this does not allow the use of small diameter mandrels.

[0003]

SUMMARY OF THE INVENTION According to the present invention, winding is performed in alternating positions. Because of this, each mandrel can be supported at multiple points along its length,
It is possible to use small diameter mandrels. Also, the finished winding roll is decelerated and ejected from the machine while the winding station on the opposite side is winding the next log.

The concept of alternating windings is known per se, but not in the case of finished size logs. For example, in Japanese Patent No. 1894253, oversized rolls are alternately wound, but a web is conveyed from a papermaking machine. In particular,
The webs, which are alternately wound into oversized rolls, are obtained continuously from the last pass of the calender stack of the papermaking machine. This oversized roll is not cut into retail size roll lengths as in the present invention, but is transported to a processing area for winding into retail diameter logs and then transversely cut with a log saw. It Therefore, it was not possible to remove the take-up reel from the oversized log as these reels were needed to support the oversized roll in the rewinder. Another form of the surface winding machine is Japanese Patent No. 42562.
No. 69 and co-owned US Pat. No. 4,588,138, neither of which is without a core as in the present invention.

Other objects and advantages of the present invention will be appreciated from the details of construction and operation described herein.

DETAILED DESCRIPTION OF THE INVENTION The present invention will be described below with reference to the accompanying drawings. FIG. 1 shows a flow chart as applied to the present invention.
The box labeled "Paper Machine" on the far left represents a paper machine with conventional construction. Usually, this machine uses pulp slurry, which is introduced onto the Fourdrinier wire. The wire is followed by a drying roll to bring the water content to about 5%.

This results in a web that can be wound on an oversized roll J, shown schematically on the right side of the paper machine of FIG. Oversized roll J depending on the paper machine and processing conditions
Has a diameter of 152.4 cm (5 ft) to 304.8
cm (10 feet), length can range from 121.9 cm (4 feet) to 609.6 cm (20 feet). At present, machines tend to be wider in order to obtain larger products at the same web speed.

After being wound, the extra-large roll is usually conveyed to a processing area, that is, a processing section provided with a large number of rewinders. The present invention utilizes a surface rewinder as disclosed in co-owned US Pat. No. 4,828,195. As the speed of the paper machine increases, it may be necessary to use more than one rewinder to change the output of a particular paper machine.

In any case, the output of the rewinder is in the form of a log having a length equal to the width of the web on the oversized roll J. Since the log L has a diameter corresponding to the diameter of retail size rolls such as toilet tissue, kitchen towels, etc., the diameters are variable. Diameter is 100 to 250
It varies from mm (4 to 10 inches).

Thereafter, the log is shared patent RE30598.
It is processed through a log saw disclosed in No. As a result, a plurality of products P are obtained from each log L. Generally, the product will take the form of a roll of toilet tissue P1 as shown in FIG. 2 or a roll of kitchen towel P2 as shown in FIG. These lengths are generally about 375 mm
(15 inches) or less.

Against this background, the winding method of the present invention shown in the embodiments of FIGS. 4 and 6 will be described. In each of the embodiments of FIGS. 4 and 6, the paper machine has a conventional take-up roll and punch. The take-up roll is RE28
No. 353 and the punching machine is that disclosed in co-owned patent No. 2870840.

Embodiment of FIG. 4 Referring to FIG. 4, the reference numeral W at the top of the drawing indicates that it is engaged with the perforating roll 10 so as to be wound around a part via a pulling roll (not shown). Shows a moving web. Code 11
Shows a fixed knife plate that cooperates with the perforated bedroll 10 disclosed in the above-mentioned Japanese Patent No. 2870840. As a result, 11 for toilet tissue in the United States
2.5 mm (4-1 / 2 inch), 2 for kitchen towels
A lateral perforation of 75 mm (11 inches) spacing is obtained.

The web W is perforated laterally at the above mentioned center distance and then moves towards the main bed roll 12 or "transfer" bed roll and wraps around a part thereof. The bed roll 12 cooperates with the cutting roll 13 and has several functions. The bed roll 12 is used to determine the number of sheets in the wound log. Bed rolls 12 are typically designed as 10 sheets per revolution. When the bed roll achieves a predetermined number of revolutions, the blade mechanism in the bed roll meshes with the blade 14 and the cutting roll 13, and the web W is cut to, for example, the length
A desired number of sheets such as 2.5 mm (4-1 / 2 inch) and 275 mm (11 inch), for example, 350 and 500 sheets are produced. A sheet is defined as lying between adjacent transverse perforations.

Engagement of the blades is accomplished along the transverse perforations to produce a predetermined number of sheets. The sheet in front of or downstream of the blade is wound onto a roll or log. The winding cycle of the log ends at L in the left center of FIG. The portion of the web that follows the engagement blade is conveyed to the mandrel 15 at position A in FIG. 4 (FIG. 4).
See the right hand side). The log L in the process of completion is at the position B on the left side of FIG.

FIG. 4 Winding operation (general) When the log L is wound, the arm 16 'axially separated from the winding rolls 17' and 18 'while rotatably supporting the winding drums 17' and 18 'is separated from the bed roll 12. It is moved so that the diameter of the winding log can be increased (compare the angular position of the left arm 16 'with the right arm 16 or position A).

Further, the take-up drums 17 ', 18' are pivotally mounted about 19 ', 20' for movement during winding so as to accommodate the increase in roll diameter. (Again, the positions of the winding drums 17 ', 18' and the positions of the winding drums 17, 18 at position A,
And compare the change in the pivot arm angle). The arm supporting the winding drum 17 is designated by reference numeral 21.

Although not shown for convenience of illustration and understanding, drive means for the winding drums 17, 18 and 17 ', 18' are provided. The drive means comprises prime mover means provided on each of the arms 16, 16 'and includes an electric motor, belt, pulley system and the like along with suitable clutches. As a result, the winding cycle period is adjusted and the winding operation is stopped at the end of the winding cycle.

When the winding cycle is completed, the operation shown in the lower left of FIG. 4 is performed. The arm 16 'has a pivot 21
Rotate counterclockwise around to position the log L at the extraction position. In the extraction position, the arm 16 'is 16 "
Take the orientation shown in. This is accomplished by rotating the arm 16 'and thus the mandrel 15' along arc 22. As a result, the mandrel 15 'is moved to a position where the winding roll or log L is withdrawn from the mandrel 15' by means 23 detailed in FIG.

In order to extract the log L, the support arm 16
Or part of 16 '(the latter is in the 16 "position) has been rotated so that the finished log can be ejected from the take-up mandrel. It has been pivoted to create a clearance for ejecting the log. A portion of the arm 16, 16 'returns to its closed position after the roll has passed through the mandrel end, after which the arm 16 or 16' returns to a position close to the bed roll for the next log. Store and start winding.

The winding is performed by the knife 14 on the cutting roll 13.
Starting from the leading edge formed by The leading edge is
The vacuum applied to the port on the surface of the bed roll attaches to and guides the bed roll. The port is connected to the vacuum ring 24. When the leading edge comes to a position aligned with the mandrel, the pressure assist 25 separates the leading edge of the web from the peripheral edge of the bed roll 12 to bring it into contact with the mandrel 15. The mandrel 15 is shown in FIG. 5 and is relatively elongated with an axially extending passageway 26. The passage 26 communicates with a vacuum source 27, which is connected to a vacuum pump (not shown). The vacuum applied through the axially extending passageway 26 and port 28 causes the leading edge to adhere or press against the outer surface of the mandrel 15 and the rotation effect of the rolls 17 and 18 causes the mandrel 15 to rotate to cause a log L. Start forming.

Embodiment of FIG. 6 Again, the rewinder uses a standard take-up roll and perforator as shown in the embodiment of FIG. In FIG. 6, the web W moves so as to wind around a part of the bed roll 112. The bed roll 112 works in cooperation with a cutting roll 113 having a knife 114 to form the end of one log and the starting point of another log. The bed roll 112 is used to determine the number of sheets of the winding log. Again, the bed roll 112 is typically designed with 10 sheets per revolution. When the bed roll 112 attains a predetermined rotation speed, the blade mechanism of the bed roll 112 cooperates with the blade 114 and the cutting roll 113 to cut the web.

The portion of the web in front of the blade is wound around the log L at the left position. The sheet portion following the blade 114 is sucked by the evacuated drive roll 117 and transferred to the second evacuated drive roll means 118. As a result, the front edge of the web is mandrel 115.
And the next winding cycle is started.

The winding cycle is accomplished by evacuated roll means 117,118. The roll means 11
7, 118 have radial slots, are internally meshed as seen in FIG. 6 and form cradle or nips where the peripheral edges intersect. These can be considered as "ring" rolls because of the axial interception and intersection.

At the end of the winding cycle, these ring rolls 117, 118 decelerate to stop the winding log and prepare for log discharge. This is shown in the right and left end positions of FIG. 6 with arms 116 and 116 'having slots 129 and 129', respectively. Each arm is mounted rotatably on the frame from a 12 o'clock position to a 3 o'clock or 9 o'clock position. At the 3 o'clock or 9 o'clock position, the mandrels conveyed into the slots are placed in the corresponding slots 13 of the extraction means 123, 123 '.
0, 130 '.

That is, at the end of the winding cycle, the arms 116, 116 'located on the right and left sides rotate to the log discharge stations 123, 123'. Again, a portion of the support arm 116 or 116 'is pivoted so that the completed log can be ejected from the take-up mandrel 115 or 115'. After that, a part of the arms 116 and 116 'that rotate to form a gap for discharging the log returns to the closed position after the log passes through the end of the mandrel. Then, optionally, the arm is a mandrel 1
Return 15, 115 'to the winding position. In this embodiment, the mandrel is optionally slot 129 or 1
The bed roll 1 is slidably mounted in 29 '.
It can move substantially radially outward with respect to 12 to accommodate an increasing web layer wound in a convolution.

Also in the embodiment of FIG. 6, the punching machines 10, 1
The take-up roll 131 is arranged upstream of the No. 1. Since the embodiment of FIG. 6 does not have the bed roll 112 in contact with the log L during the winding cycle, the rider rolls 132, 132 'are pivotally mounted on the machine frame 133 and 133'. For example, rider roll 132 is roll 1
Together with 17 and 118 form a three roll cradle for surface winding. Similarly, rider roll 13
2'cooperates with take-up rolls 117 'and 118'.

In carrying out the present invention in each of the above embodiments, it is desirable to provide a mandrel having a diameter of about 25 mm (1 inch) or less. Further, although many of these mandrels are long at 3 m (10 feet) or more, they are supported by a take-up roll to prevent an inappropriate warpage.

[0028] The detailed description of the invention hereinabove is for purposes of illustration, and many of the details described herein will be apparent to those skilled in the art without departing from the spirit and scope of the invention.

[Brief description of drawings]

FIG. 1 is a schematic diagram of a material flow starting with a paper machine and ending with a finished product.

FIG. 2 is a perspective view of the finished product of FIG. 1, that is, a tissue roll for a restroom.

FIG. 3 is a perspective view of the finished product of FIG. 1, namely, a kitchen towel roll.

FIG. 4 is a (substantially schematic) side view of a rewinder utilizing the teachings of the present invention.

5 is a partial end view of a single mandrel taken along line 5-5 of FIG.

FIG. 6 is a view similar to FIG. 4, showing a modified example of the present invention.

[Explanation of symbols]

 J ・ ・ ・ ・ ・ ・ Oversized roll J L ・ ・ ・ ・ ・ ・ Log P ・ ・ ・ ・ ・ ・ Product P1 ・ ・ ・ ・ ・ ・ ・ ・ ・ Lashroom tissue P2 ・ ・ ・··· Kitchen towel W ···· Web 5-5 ··· Line of sight (partial end view of FIG. 5) 10, 11 ··· Perforator 12, 112 ··· Bed roll 13 ... Cutting roll 14 Knife 15 Mandrel 16 Arm 17 and 18 Winding drum 21 ··· Pivot arm 22 ··· Circular arc 24 ··· Vacuum ring 25 ··· Pressure assist 26 ··· Passage 27 · ·・ ・ ・ ・ ・ Vacuum source 28 ・ ・ ・ ・ ・ ・ Port 112 ・ ・ ・ ・ ・ ・ Bed roll 113 ・ ・ ・ ・ ・ ・ Cutting roll 114 ・ ・... Blade knife 117 ... First drive roll 118 ... Second drive roll 123 ... Log discharge station 129, 130 ... Slot 131 ... Take-up roll 132 ........ Rider roll

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Joseph A. Bloom, Larau Lane, Green Bay, Wisconsin, USA 2317 (72) Inventor Harley Seezan Green, Wisconsin, United States Bay, St. Mashse Street 238

Claims (10)

[Claims] 1. A coreless rewinding method comprising: a first and a second long winding mandrels (15, 1).
5 ', 115, 115'), directly winding the web onto the first mandrel to form a log (L) of a given diameter, and pre-winding the log onto the first mandrel. A step of withdrawing the mandrel from the second mandrel, wherein the winding step and the withdrawing step are alternately performed, and the winding step includes a surface driving means
7, 18, 17 ', 18'; 117, 118, 11
7 ', 118') and supporting each mandrel substantially along its length while rotating by contacting the web with the second mandrel. Including moving the first mandrel from a take-up position to a take-off position and back to the take-up position, and laterally cutting the log to obtain a plurality of retail size products. , Characterized method. 2. The winding step includes the step of rocking each mandrel between a pair of driven roll means for surface winding the web into a series of logs. The method described in 1. 3. The first (17, 18; 117, 118) and the second (1
7 ', 18'; 117 ', 118') pairs of driven rolls and arranging each pair to form a mandrel support nip therebetween, the first mandrel (15, 115) The second mandrel (15 ', 11) is supported by one roll nip.
5. The method of claim 2, including supporting 5 ') in a second roll nip. 4. Means (16, 16 '; 1) for moving each mandrel away from its associated roll pair during winding in each of said steps.
9. A method according to claim 3, characterized in that 9 ', 20'; 129, 129 ') are provided to accommodate the increase in diameter until the predetermined diameter is reached. 5. The first and second rotatable arms (16, 16 ') for rotatably supporting a pair of driven rolls and for rotatably supporting one of the mandrels in each step. 5) and rotating each roll away from the mandrel during the winding. 6. Each step of providing a first and a second arm (116, 116 ') with a slot for supporting an associated mandrel, respectively, and during winding the mandrel with its associated slot. And moving in a direction away from its associated pair of driven rolls. 7. The method of claim 6, wherein each of the steps includes providing crossed rolls to form the driven rolls. 8. The step of providing the mandrel comprises about 25
The method of claim 1, comprising providing a mandrel having a diameter less than 1 mm (mm). 9. The method of claim 1, wherein the alternating winding step comprises the step of providing each mandrel with vacuum means (27) for attaching the web to the mandrel. 10. The method of claim 1, wherein the transverse cutting step comprises producing a product having a generally cylindrical profile and a diameter less than about 250 mm (10 inches). .