JPS6023246A - Roll of synthetic resin film - Google Patents

Abstract

PURPOSE:To prevent the lateral end of a film from slackening and bending in unwinding the film by forming the winding start portion of the film in such a manner that two or more lines bisymmetrical lines about the longitudinal central axis of the film intersect each other. CONSTITUTION:The winding start portions of films 21, 41 to be wound round a reel into a roll are formed in such a manner that four straight lines 22, 23, 24, 25 intersect each other bisymmetrically about the longitudinal central axis 26 of the film. The straight lines 42, 43 to intersect each other may be two. Thus, the slackening and bending of the lateral end of a film can be prevented in unwinding the film.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a rolled synthetic resin film. More specifically, when unwinding and using a fully wound wide and long synthetic resin film, the diameter at one end may become larger than the diameter at the other end even when approaching the yarn core. The present invention relates to a roll-shaped product of a synthetic resin film that does not cause undesirable phenomena such as sagging or bending of the edges in the width direction of the film, and that allows for easy intermediate processing operations.

Synthetic resin films are usually manufactured continuously and wound onto a yarn core. In this case, when the winding on one yarn core is completed and the yarn core is full, a new yarn core is sent, cut by the Filmke cutting blade, and the cut end is wound onto the new yarn core. It has been adopted.

The new method of synthetic resin film, which has been known for a long time, is
As shown schematically in FIG. 7(a), a cutting blade 73 is placed near the yarn cores 7, 2 which are arranged at right angles to the feeding direction of the synthetic resin film (direction of arrow 2j). , is arranged so as to be able to run parallel to the center axis of the thread core 72, and the cutting blade 23 is run in the direction of arrow 2g to cut the synthetic resin film from one end to the other end in the width direction.

The cut end portion 2.2 of the synthetic resin film 7/ (the part where winding begins on a new yarn core) when cut using this conventional method is as follows:
As shown in the plan view in FIG. 2 (b), there were the following drawbacks.

(1) When the width of the synthetic resin film is large, it takes time from the start of cutting to the end of cutting, so the cut edge 72
As shown in FIG. 2(b), a right triangle is formed with one end in the width direction having an apex Of, and this portion becomes a turning loss.

(2) When using a fully wound roll of synthetic resin film whose cut end has the shape shown in Figure 2 (B) while being unwound, the closer the cut end is to the yarn core, the more one end in the width direction. The diameter on the C side is noticeably narrower than the diameter on the other end, and one end of the synthetic resin film on the C side becomes slack.9
, wavy or curved at one end to the opposite side of C.

(3) Furthermore, as the synthetic resin film gets closer to the yarn core, it is wound with different tensions at one end C side and the other end in the width direction, so the unwound film shrinks differently in the width direction. Rate 2 is shown.

In order to eliminate the drawbacks (1) to (3) above, a method has been proposed in which the cut end of the running film is cut at right angles to the length direction of the film, a method that uses a so-called compensator. However, the former had problems with the mechanical structure, front element, safety, maintenance, etc., and the latter had complicated mechanical equipment, which was not desirable.

Synthetic resin films are often used in ultra-wide widths depending on the application. For example, width/3! ~yoo, the ends of the long film in the width direction are bonded together, and this bonding process is called "intermediate process". ) used after widening.

When performing intermediate processing on conventional synthetic resin films, there were the following problems.

(1) When performing an intermediate process, the intermediate area (the part where the widthwise edges of two films overlap) is as follows:
Normally, it is preferable to set it to 2 to j cTn, but if the edge of the film to be rewound (referring to the edge in the width direction) is not straight but curved, the edge of the film may be sagging. If this occurs, undesirable phenomena such as narrowing of the width of the intermediate seam, missing seams, or overlapping seams of slack portions and adhesion occur.

(2) In order to eliminate the above phenomenon (d), it is necessary to provide manual assistance and correction;
Even if you make some modifications, if you use it as an object or to cover a house, it will still have some sagging, wrinkles, etc.

Under such circumstances, the present inventors discovered that when a fully wound wide and long synthetic resin film is used while being unwound, the diameter of one end becomes 11+ even when approaching the yarn core.
To wind up a synthetic resin film in roll form, which does not become larger than the diameter of 1J, does not cause undesirable phenomena such as sagging or bending of the edges in the width direction of the film, and facilitates intermediate processing operations. As a result of intensive study, the present invention was completed with the aim of providing a product that can be used in a commercially available manner.

Therefore, the gist of the present invention is that, in nine products in which a long and wide synthetic resin film is wound into a roll, the shape of the starting portion (cut end portion) of the winding around the yarn core is at least two. The above-mentioned lines intersect, and this shape is substantially symmetrical on the left and right sides with respect to the central axis in the longitudinal direction of the film. There should be substantially no unevenness at the edges, and the difference in the outer circumferential dimensions at both ends of the rolled material should be within 10 g + 1, and between both ends of the rolled material and the angle θ - inside from these ends. All outer circumference dimensions of the section between the positions are - based on the outer circumference dimensions of each end.
! (2) within the range of 110 rmn from (1), and all the outer circumferential dimensions of the sections sandwiched between both ends of the rolled material at two positions inside the GOCm are larger than the outer circumferential dimension of one of both ends. The present invention relates to a roll-shaped product of a synthetic resin film, characterized in that the range is from -s mm to 10 mm.

The present invention will be explained in detail below.

In the present invention, the synthetic resin film refers to polyethylene,
Polypropylene, ethylene-hinyl acetate copolymer, ethylene-acrylic acid ester copolymer, vinyl chloride-ethylene copolymer, polyvinyl chloride, vinyl chloride-vinyl acetate copolymer, polyvinylidene chloride, polyamides, polyethylene terephthalate, A film made of thermoplastic synthetic resin such as polybutylene terephthalate or polycarbonate. This film may be a single layer or a laminate of different types of synthetic resin films.

To manufacture the synthetic resin film, techniques such as extrusion molding methods such as T-die method and inflation method, calender molding method, and casting method can be employed.

The film preferably has a thickness θ, oi ~ 0°1-preferably θ, 0
The range is 3 to 0.3, and the width is 10 o -soθcm
, the length is! The range of θ to 2000 m is preferable.

Hereinafter, one embodiment of the present invention will be described in detail based on the drawings, but the present invention is not limited to the following examples as long as the gist thereof is not exceeded.

FIG. 1 is a perspective view of a rolled film according to the present invention, and FIGS. 2 to S are plan views of the starting portion (cut end) of the film around the yarn core. , Fig. 2 is a plan view of the state in which the widthwise edges of two sheets of film are overlapped and the intermediate processing is performed on this part, and Fig. 2 (a) is a new method of cutting the film that has been used conventionally. An example of the arrangement of the cutting blade with respect to the yarn core, Figure 7 (Ronba). It is a diagram.

In the figure, //1.2/, 3/, gu/,! /、Otsu/、
Otsu λ, 7/ are respectively synthetic resin films, /, 2. A3
,≦ri1. 7 is a rolled film, respectively.
B, 72 are the yarn cores, /g is the end of the film in the longitudinal direction, 22.23, 2g, 2S13, 33.3,
3! , g, 25g, 3, j, and j3.2 are respectively the diameter of the cut end x + 17) m/3-52, 3, and
J is the center line in the length direction of the film, respectively. , Otsu 6 is the support shaft of the rolled material, Otsu 2 is the intermediate part, Otsu 2 is the high frequency sewing machine, Otsu 2 is the glued part, 7
3 is a cutting blade, 7Z is an arrow indicating the running direction of the cutting blade, 7j
arrow b indicates the film feeding direction; AO+BO indicates both ends of the rolled material; A40+"40 indicates a from AO, BO to a, respectively.

Position 2 on the inside of the mouth is shown.

In the nine roll-shaped film rolls according to the present invention, the shape of the starting part (cut end part) for winding around the yarn core is such that at least two or more straight lines intersect, and the shape is The left and right sides need to be substantially symmetrical about the central axis in the longitudinal direction of the film. The reason why the starting part (cut end) of winding onto the yarn core is shaped in a special way is to reduce loss when changing the film, and to use a fully wound roll of film while unwinding it. When this happens, the diameter at one end in the width direction will have a noticeable difference in size compared to the diameter at the other end, even if it is close to the yarn core, which may cause the film 4'r section to bend or the shrinkage rate of the filter to fluctuate. This is to prevent it from getting bigger.

In the example shown in Figures 1 to 3, the cut end is constructed by crossing four diameters, and the left and right sides are substantially symmetrical with respect to the central axis in the length direction of the film. has been done.

Figures 1 to 6 = r In the example shown in Figure 6, the cut end is constructed by intersecting two straight lines, and the left and right sides are substantially symmetrical with respect to the central axis in the length direction of the film. It is said that

An example of cutting a continuously produced film to give the cut end the shape shown above is shown below.

(1) Enable multiple cutting blades to run in the diametrical direction with respect to the film feeding direction, and separate adjacent cutting blades to the extent that they do not collide with each other, and run in different directions. How to let and cut.

If two cutting blades are used, the cut edges shown in Figures 3 and 5 will be obtained; if four cutting blades are used, the cut edges shown in Figures 2 and 3 will be obtained. A cut end is obtained.

(2) A method of cutting using a laser beam transmitter with multiple light sources.

The rolled film according to the present invention is a film obtained by winding the cut end of the film as shown above onto a thread core so that the outer periphery of the roll has a specific shape. To wind up the film into a roll around the yarn core, a conventionally known film winding method such as a center winder, a surf S winder, etc. may be used. The yarn core that can be used is made of kraft paper and has a wall thickness of 3 to 10++l+11. Outer diameter l
Preferably, the length is θ~/'00- and corresponds to the width of the film.

In order to achieve the object of the present invention, it is necessary to substantially eliminate the uneven edges of both ends (both ends in the width direction of the film) of the rolled film obtained in the above manner. The difference in the outer circumferential dimensions of both ends of the rolled-up material must be within /θ, and all the outer circumferential dimensions of both ends of the rolled-up material and the area 0cm inside from these ends are equal to each end. +10. , and from both ends of the rolled material to two positions inside the
It is necessary that all the outer circumferential dimensions of the sections are within the range of 5 rtan to +15 rtan with reference to the outer circumferential dimension of one of both ends.

Both ends of the rolled film of the present invention (both ends of the film in the width direction, parts Ao and Bo in FIG. 1)
It is necessary to substantially eliminate irregularities at the edges. Substantially eliminating edge irregularities means that the edges of the rolled film are substantially aligned and there is no difference of 2 mm or more over the entire length at the same edge of the film. .

The purpose of substantially eliminating irregularities in the film edges at both ends of the rolled product is to reduce fluctuations in the width of the joining margin and improve the performance of the joined wide film.

As a specific example of substantially eliminating irregularities in film edges, the following method can be cited.

(1) A method of winding a manufactured wide film while correcting vibration in the width direction. This method detects the amount of vibration in the width direction of the film, and feeds it to a film edge position corrector (so-called edge guider) during winding. This is a way to eliminate it.

(2) The wide film to be wound around the yarn core is gently vibrated in the width direction of the film to form a master roll with uneven ends.While winding this master roll back, both ears are Cut IO, How to align the ends to a new yarn core and wind it up from Kotobuki.

(3) Wind the manufactured wide film onto the yarn core without using an edge guider, etc., and cut both ends of the fully wound yarn with a knife to make it fully wound. How to eliminate irregularities.

It is preferable that the outer circumferential dimension of the rolled material is the same at any position in the width direction. However, as the length of the rolled film increases,
It becomes difficult to make the outer peripheral dimensions of the roll uniform. The present inventors have found that in order to easily perform the intermediate joining process even when a long film of 60 m or more is wound into a roll, the outer circumferential dimensions of both ends, the outer circumferential dimension difference near both ends, and the outer circumference of the center part are easily carried out. It was discovered that the dimensional difference can be adjusted within a specific range.

Nine roll-shaped films according to the present invention are as follows.

The difference in outer circumferential dimension between both ends of the rolled material (the position of AO+"0 in Figure 1) must be within /θ.

If the difference in the outer circumferential dimensions of both ends is greater than 10, then the diameter of one end is greater than the diameter of the other end. Undesirable phenomena such as the larger diameter end of the film sagging or the entire film bending toward the smaller diameter end when the film is unwound from a roll due to a large dimensional difference. This is because it becomes noticeable.

The roll-shaped film according to the present invention is produced in the vicinity of the ends of the film, that is, at both ends and from these ends.
The outer circumferential dimension at all positions of the section of the inner position of o an is +10 from -3' trunk based on the outer circumferential dimension of the end.
Must be within the range of asthma. That is, the hang position A. and A. The deviation of the outer circumferential dimension at all positions in the section with is -! based on the outer circumferential dimension at the position Ao! +7 from ceramics
0. Similarly, within the range of n, there are two positions B. The deviation of the outer circumference at all positions in the section between and B2O is +10n from -S based on the outer circumference at the Bo position.

must be within the range.

When the deviation of the outer circumferential dimension of the section between the two positions is within the above-mentioned range, it is possible to easily perform the intermediate processing of the edges of the two films, but when it exceeds the above-mentioned range,
Sagging, waving, or bending of the film may occur at the edges of the film, or after bonding by intermediate processing, one film may be taut at the molecular boundary of the bonded area while the other film is sagging. If the exposed edges are wrinkled or folded and bonded, or if one film has a larger curve than the other, undesirable phenomena such as failure to bond may occur.

The roll-shaped material of the film according to the present invention has a groove extending from the central portion of the winding nose, that is, from both ends of the rolled material.
rn inner position (A, and B, o in Figure 1)
The position of ), all the outer circumference dimensions of the section sandwiched by
b -' 71m based on the outer circumference of one of both ends
Must be within the range of .

The outer periphery of the central portion sandwiched between the two positions A40 and B10 is allowed to vary slightly more than the outer periphery of the portions near both ends. However, if the fluctuation in the outer circumferential size of the central portion exceeds the above range, the ends of the two films are widened (by joining),
When used, even if the part with a small outer circumference is tensioned, the part with a large outer circumference will sag. An undesirable phenomenon occurs in which water builds up on the parts.

In the roll-shaped film according to the present invention, the outer circumferential dimensions of each of the ends, the vicinity of both ends, and the center of the film 1 are adjusted within a specific range.

As a specific example of adjusting the outer circumferential dimension of a rolled-up long film to the above-mentioned specific range, the following method can be mentioned.

(1) In one example of manufacturing a film using an extrusion molding method, raw resin is discharged in the form of a film from a nozzle whose discharge thickness can be adjusted depending on the amount of bolt tightening, then cooled in a cooling drum, and further processed as required. If there is, after stretching, the film is wound around a yarn core using a winding device 9, the diameter distribution of the film roll during winding is detected, and the discharge thickness of the said nozzle is adjusted according to the detected diameter distribution. How to adjust.

(2) In another example where a film is manufactured by extrusion molding, the raw resin is discharged in the form of a film from a nozzle whose thickness can be adjusted depending on the volume of the bottle, and then cooled by a cooling drum or cooling roll. At this time, a plurality of heating means and/or cooling means are placed along the surface of the cooling drum or cooling roll at certain intervals so that they can each be independently controlled. The device detects the diameter distribution of the film roll during winding and winding on the film thread core, and according to the detected diameter distribution,
The thickness of the film can be determined by independently controlling necessary parts of the heating means and/or cooling means.

How to adjust the outside diameter of the roll.

(3) In one example of manufacturing a film by a calendar molding method, the diameter distribution of the film roll during film winding is detected, and the measured value is used to klllut' one roll at the center using a roll spacing adjustment device. A method of adjusting the film thickness and outer diameter of the roll by feeding and banking it to a roll bending device, etc.

(4) In another example when a film is manufactured by a calendar molding method, a plurality of heating means and/or cooling means are each independently controlled along the surface of one rolling roll at a certain interval. After the film is cooled, it is lazily rolled up using a winding device, and the diameter distribution of the film roll is detected during winding, and the diameter distribution is handled accordingly. and the heating means and
and/or the necessary parts of the cooling means are independent K'+I7
υ control heating and/or cooling, film thickness,
How to adjust roll dimensions.

In each of the above four examples, the diameter distribution of the film roll being wound is detected. For this purpose, a method using a tape measure 2, a method using a device that utilizes the straightness of a magnetic wave such as a laser or infrared rays, a method that utilizes absorbance, or any other known method can be used without restriction.

The present invention has been described above, and has the following particularly remarkable effects, and its industrial utility value is extremely significant.

(1) Nine roll-shaped films according to the present invention are:
To new fatigue, the shape of the rolling start part (cut end) is composed of at least two or more lines that intersect, and the shape is oriented left and right with respect to the center axis coating in the length direction of the film. is essentially targeted, so the Si of the film?
The diameter of the U-roll is approximately the same over the entire width of the film, and remains the same even when the film is being unrolled from the film. Therefore, phenomena such as one end of the rolled film in the width direction becoming sagging or the opposite end being bent are unlikely to occur.

(2) Since a roll of film is wound with approximately the same tension over the entire width in the width direction,
The shrinkage rate of the rewound film shows almost the same value over the entire width of the film, and it does not cause deformation, deformation, No changes in appearance such as wrinkles occur.

(3) Roll-up of the film according to the present invention) The rolled product has uneven ears at both ends of the product. Since the outer circumferential dimension difference is adjusted to a specific range,
Although the film is long and wide, when the rolled material is unwound and the two ends of the film are bonded together, the film may sag or the edges may curve like 9. No undesirable phenomena occur.

(4) Is the rolled film according to the present invention a film widened by intermediate processing? For example, even when used as a covering for an agricultural greenhouse, sagging areas do not occur and the material can be preferably tensioned.

[Brief explanation of drawings]

FIG. 1 is a perspective view of a roll-shaped film according to the present invention, and FIGS. Figure 3 is a plan view of two films in which the edges in the width direction are overlapped and the edges are joined together, and Figure 2 (a) is a cutting method that has been used in the past. Example of cutting blade arrangement for new fatigue in Figure 7 (cl) U, Figure 7 (a)
A top view of an example of the starting part (cutting end) is shown in FIG. In the figure, //, 2/, 3/, ri/, 3i, Otsu/, and Otsu2.7/ are respectively synthetic resin films, /mo63, Otsu ¥
are the rolls of film, /3.72 are the respective fatigues, /g is the end of the film in the longitudinal direction, and 2
2, 23.2, 2J-13-2, 33.3, 33゛1, 2, 3.3, and 3.7 are the straight lines formed on the cut end, 15.26, 3, respectively. Otsu, ¥9, J are the center lines in the length direction of the film, ζ6 are the support shafts of the rolled product, Otsu 7 is the intermediate joint, Otsu is the high frequency sewing machine, Otsu 2 is the glued The part 23 is the cutting blade, ?
¥ is an arrow indicating the running direction of the cutting blade, 7j is the film feeding direction 'f 7F arrow, Ao + Bor- are both stars of the rolled material; 1re A40 m B2
O indicates the position from 80+Bo to Off+inside, respectively. Applicant Mitsubishi Monsanto Kasei Co., Ltd. Agent Patent Attorney Hase - (7 others) Figure f Figure 6 Figure 7

Claims (1)

[Claims] (1) In a roll-shaped product of a long and wide synthetic resin film, the shape of the starting part (cut end part) of the winding around the yarn core is such that at least two or more wires intersect,
Further, this shape is substantially symmetrical on the left and right sides with respect to the central axis in the longitudinal direction of the film, and substantially eliminates edge irregularities at both ends of the rolled material. The difference in the outer circumferential dimensions of the two ends of the nine rolled rolls must be within 10 mm,
All the outer circumferential dimensions of the sections between both ends of the rolled material and the position inside the groove from these ends are within the range of +10 from -j゛ order based on the outer circumferential dimensions of each end. And all the outer circumferential dimensions of the sections sandwiched between the two ends of the rolled material at the two positions inside the groove θα are -! From pant +/! 1. A roll-shaped synthetic resin film, characterized in that it is within a tolerance range.