JPS6023244A - Roll of agricultural vinyl chloride resin film - Google Patents

Abstract

PURPOSE:To prevent the lateral ends of a film from slackening and bending in case of unwinding a roll of wide and long agricultural vinyl chloride film for use by specifying the outer peripheral size of a roll. CONSTITUTION:The deviation of outer periphery at all positions in a section from both ends of a roll 12 and 40cm inside from the end, that is, between positions A0 and A40 is within the range of -5mm. the to +10mm. to the basic outer periphery at the position A0. Similarly, the deviation of outer periphery at all positions in the section between positions B0 and B40 is within the range of -5mm. to +10mm. to the basic outer periphery at the position B0. When the deviation of outer periphery in a section between two positions is within the above range, two sheets of films can be easily joined to each other laterally at side end portions thereof.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a rolled agricultural vinyl chloride resin film. More specifically, when a wide and long agricultural vinyl chloride resin film in a fully rolled state is used while being unwound, undesirable phenomena such as sagging or bending of the edges in the width direction of the film do not occur. This invention relates to a rolled agricultural vinyl chloride resin film that can be easily relayed.

Conventionally, greenhouse cultivation has been widely used to promote or suppress cultivation of useful plants. BACKGROUND ART As coating materials for houses and the like, films made of soft blended vinyl chloride resins have been widely used from the viewpoints of light transmittance, service life, ease of construction, economic efficiency, and the like.

Agricultural vinyl chloride resin film usually has an outer diameter of 60 mm.
It is sold as a roll-shaped product wound around a core made of kraft paper of ~100rr UH. Traditionally, manufacturing;
The width of the film that was being sold was 73 to 30 cm, and the length of the film rolled up into a roll was approximately 100 m.
Met.

When using a film rolled up in the form of a roll of such width and length as a covering material for a large house with a wide frontage, it is necessary to unwind the two sheets of Tufffilm that have been rolled up into a roll, and then unwrap the two films. The ends of the film in the width direction are adhered together using an adhesive means such as a high-frequency sewing machine to form a wider film (this adhesion operation is hereinafter referred to as "intermediate operation").

Regarding the conventionally known roll-shaped roll-up of agricultural vinyl chloride resin film, there were the following problems when performing a relay operation.

(I) Agricultural film for house deterioration is made wide by intermediary operation according to the depth of the house.
-It is often processed to a length of 3.0 m. If the length of the rolled film is 100 m, the overall length of the film is not very long, so the rolled material must be attached and removed frequently during the work process, which is a hassle. If the film length of the roll-shaped product remaining after several relay operations does not reach the length required to perform -th relay operation, it becomes a so-called end length, resulting in a lot of loss. In order to reduce the film loss due to the end length, the end length is collected and glued in the length direction, but it must also be glued in the width direction, which necessitates extra gluing work. However, even if such adhesion work is performed, film loss due to edge length cannot be completely eliminated.

(2) When performing a relay operation, the relay margin (the part where the widthwise ends of two films overlap) is usually λ~
3 cm is preferable, but the edge of the film to be rewound (meaning the edge in the width direction) may be meandering (the edge of the film may not be straight but curved) or ,
If the edges of the film are sagging, undesirable phenomena such as lack of intermediate marks, narrowing of the width, and overlapping of sagging portions may occur. In order to eliminate this phenomenon, manual assistance and correction is required. Even if manual assistance and correction is applied, when actually used for covering a house, partial sagging may occur. It has the disadvantage that it is easy to use and difficult to find as a good product.

In order to eliminate the drawback of (1) above, it is obvious that the length of the film to be wound into a roll can be increased, but simply increasing the length of the film will not cause the drawback of (2) above. cannot be solved, and the purpose of saving labor in relay operations cannot be achieved.

Under such circumstances, the present inventors found that when a wide and long agricultural vinyl chloride resin film that is fully rolled up is used while being unwound, the edges in the width direction of the film may sag or bend. With the aim of providing a roll of agricultural vinyl chloride resin film that does not cause such undesirable phenomena and can be easily relayed, the present invention has been completed as a result of intensive research. It is.

However, the gist of the present invention is that the length is 300 mm.
In a rolled product of long and wide agricultural vinyl chloride resin film with a width of 100 to 300 cm or more,
The unevenness of the ends of both ends of the rolled material is substantially eliminated, and the difference in the outer circumferential dimensions of both f1 and 1 of the rolled material is within lOmrh, and the difference between the two ends of the rolled material and these All the outer circumference dimensions of the section from the end to 'l Oor + inside position are -k based on the outer circumference of each end/section.
mm to +10TMn, and all outer circumferential dimensions of the sections sandwiched between two positions 11.06 m inside from both ends of the rolled material are based on the outer circumferential dimension of one of both ends. -s inm to 173 mm.

The present invention will be explained in detail below.

In the present invention, the vinyl chloride resin refers to polyvinyl chloride and a copolymer mainly composed of vinyl chloride. Monomers copolymerizable with vinyl chloride, vinyl esters, vinyl ethyls, acrylic acid or methacrylic acid and esters thereof, maleic acid or fumaric acid and esters thereof, maleic anhydride, aromatic Examples include group vinyl compounds, vinylidene compounds, acrylonitrile, methacrylic acid, ethylene, and propylene sodium.

In order to form a vinyl chloride resin into a film and use it for agricultural purposes, it is preferable to mix a plasticizer with the base resin to soften it and form it into a film.

In order to soften the vinyl chloride resin, base resin 70
It is preferable to mix lIo to 60 parts by weight of plasticizer with respect to 0 parts by weight.

Examples of plasticizers that can be used include phthalate esters such as dioctyl phthalate, dibutyl phthalate, butylbenzyl phthalate, dibenzyl phthalate, diindecyl phthalate, didodecyl phthalate, and diundecyl phthalate; dioctyl adipate; , adipic acid-n-
Aliphatic dibasic acid esters such as butyl and dibutyl sebacate; glycol varnishes such as pentaerythritol ester and diethylene glycol benzoate. Chills; Fatty acid esters such as methyl acetyl ricinoleate; Phosphorus f7 x esters such as tricresyl phosphate and triphenyl phosphate; Epoxidized oils such as epoxidized soybean oil and epoxidized linseed oil; acetyltributyl citrate 1, Citric acid esters such as acetyl trioctyl citrate and tri-n-butyl citrate; plasticizers with various structures such as trialkyl trimellitate-1, tetra-n-octyl pyromellitate, polypropylene adipate, and other polyesters. can be given.

In addition to the above-mentioned plasticizers, the vinyl chloride resin contains various usual resin additives, such as lubricants, antioxidants, ultraviolet absorbers, light stabilizers, dyes, normal phases, fillers, flame retardants, etc., as necessary. can be blended.

These resin additives can be selected in the usual blending amount, for example, within the range of S-heavy weight part or less per 700 parts by weight of the base vinyl chloride resin.

In order to blend various resin additives into the base vinyl chloride resin, conventional blending and mixing techniques such as a ribbon blender,
Panzer mixer, super mixer, and other conventionally known compounding machines and mixers may be used.

In the present invention, the vinyl chloride resin composition containing the plasticizer is formed into a film and rolled up into a roll. To form the vinyl chloride resin composition into a 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 has a thickness of 0.0/~Q,! 1 nUn, particularly preferably fd O, in the range of 0.3 to 0.2 mn,
The width is 100 to left 00 cln. If the thickness is less than 0.03, the strength is insufficient and undesirable;
If it is thicker than 100 nm, the film formation process and subsequent handling (
This is undesirable because it causes inconvenience to relay operations (including work such as spreading to a cage), etc. Film width is / 00
If it is less than a++, it is necessary to repeat the relay operation several times in order to obtain a wide width, and the yarn core with the full roll and end length film must be attached and removed from the relay operation execution device frequently and becomes troublesome. , very desirable. On the other hand, if the film width is more than 300 cm, not only will a large space be required for carrying out the relay operation and a place for storing the film after the relay operation is completed, but the width will also be too large. Films are not preferable because they are difficult to transport and spread into greenhouses.

After forming a film, to wind it into a roll, a conventional film winding method such as a center winder,
Wind the yarn into a roll using a surf-swinder or the like to form a roll. The yarn core that can be used has a length of 10 mm to 10 mm, which is equal to the width of the film.

The length of the film wound into one roll shall be 300 m or more. This is because if the length is shorter than this, the above-mentioned drawback (1) will occur. The longer the length of the film, the better (1)
However, if the length is too long, the weight of the roll becomes too large and other drawbacks occur, such as making it difficult to handle. Therefore, it is preferable that the length is 3,000 m or less.

In order to achieve the object of the present invention, K substantially eliminates edge irregularities at both ends (both ends in the width direction of the film) of the rolled film obtained as described above, and The difference in the outer circumferential dimensions of both ends of is within 7Orrurrr,
Both ends of the rolled material and 'I Oc
All outer circumferential dimensions of the section at the position inside m are within the range of -3rmn to @-/, Cxnx based on the outer circumferential dimension of each end, and from both ends of the rolled material. 1I
All the outer circumference dimensions of the section sandwiched between the two positions inside ooon are from -S throat to +
/knrm.

An example of the rolled product according to the present invention will be explained with reference to the drawings.

FIG. 1 is a perspective view of an example of a rolled film according to the present invention, and FIG. 2 is a state in which the widthwise ends of two films are overlapped and an intermediary operation is performed to bond these parts. FIG.

In the figure, // is a film, /2.2/, 23 are roll-shaped films, /3 is a core, Ao,
Bo are both ends of the rolled film,
A4111% B2O are each A. ,B.

221.2/l is the support axis of the film roll, λ is the intermediate part, 27 is the high-frequency sewing machine, 27 is the glued part, and the arrow is the film roll. The direction of unwinding is shown respectively.

Both ends of the rolled film according to the present invention (both ends in the width direction of the film, parts Ao and Bo in FIG. 1)
It is necessary to substantially eliminate irregularities at the edges. Substantially eliminating edge irregularities means that when the film is wound into a roll, the edges of the film are substantially aligned;
2111111 over the entire length at the same end of the film
This means that there is no further disparity.

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.

Any of the following methods may be used to substantially reduce the unevenness of the film edges.

(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 back to a device that corrects the position of the film edge during winding (so-called edge guider) to eliminate irregularities at the film edge. be.

(2) A wide film to be wound onto a yarn core is slowly vibrated in the width direction of the film to form a rolled material (master roll) with irregular ends, and while winding this master roll back, both edges are cut off and a sheet is created. , a method of winding up a new yarn core while aligning the ends.

(3) The produced wide film is wound around a yarn core without using an edge guider, etc. to make it fully wound, and both ends of the fully wound film are cut with a knife etc. 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 more difficult to make the outer circumference of the roll uniform. The present inventors have discovered that in order to easily carry out the relay operation even when a long film of 3 oom or more is wound into a roll, the following steps are required: It was discovered that the difference in the outer circumferential dimensions of the parts can be adjusted within a specific range.

The roll-shaped film according to the present invention has a difference in outer circumferential dimension between both ends (positions A and Bo in FIG. 1) of 10171.
Must be within m. The difference in the outer circumference of both ends is /4
If it is larger than m111, the difference in diameter at one end will be too large compared to the diameter at the other end, and when the film is unwound from a roll, the end with the larger diameter may sag or the entire film may become loose. This is because undesirable phenomena such as bending toward the end with a smaller diameter become noticeable.

The roll-shaped film according to the present invention is produced near both ends of the film, that is, from both ends and from these ends to 17-QC1.
The outer circumferential dimension at all positions of the section of the inner position is from -3fi to +/'0 TTU based on the outer circumferential dimension of the end.
Must be within the range of H. Well, there are two positions A. The deviation in the size of the outer circumference at all positions in the section between and A40 is -3 mm based on the outer circumference dimension at the position Ao.
1 within a range of +10 from , likewise, two positions B. The deviation of the outer circumferential dimension at all positions in the section between and B4° is B.

Based on the outer circumference at the position of 1! +10 from imm
Must be within the range of orm.

When the deviation of the outer circumferential dimension of the section between the two positions is within the above range, it is possible to easily carry out the operation when relaying the pair of two films, but when it exceeds the above range. , the edges of the film may be sagging, the film may be undulating, the film may be bent, or after being bonded by an intermediary operation, one side of the film may be sagging while the other is under tension at the bonded area, or one film may be bent. If it is too thick, undesirable phenomena such as failure to adhere will occur.

The rolled product of the film according to the present invention has a center portion of the rolled product, that is, from both ends of the rolled product.
c1n inner position (A4o and B2 in Figure 1)
Refers to the position of O. ) must be within the range of -3 mm to 10/left order based on the outer circumference of one of the ends.

The outer periphery of the central portion sandwiched between the two positions A40 and B11 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 these two films are widened by an intermediary operation,
When the product is fully expanded, even if the part with the smaller outer circumference is tensed, the part with the larger outer circumference will sag, resulting in an undesirable phenomenon in which water accumulates in the sagging part during use.

As described above, in the roll-shaped film according to the present invention, the outer circumferential dimensions of both ends, the vicinity of both ends, and the center are adjusted within a specific range.

As a specific example of adjusting the outer circumferential dimension of a roll-shaped product of a long film to be within the above-mentioned specific range, the following method may be mentioned.

(1) In one example of manufacturing a film using an extrusion molding method, the base resin composition is discharged in the form of a film from a nozzle whose thickness can be adjusted by adjusting the amount of bolt tightening, then cooled in a cooling drum, and further processed as required. A method of stretching the film, if any, and then winding the film onto a yarn core using a winding device, detecting the diameter distribution of the film roll during winding, and adjusting the discharge thickness of the spinneret in accordance with the detected diameter distribution. .

(2) In another example where a film is manufactured by extrusion molding, the base resin composition is discharged from a film discharge nozzle in the form of a film, and then cooled on a drum or roll. Along the line, a plurality of heating means and /''!, or cooling means are placed at a certain interval,
After stretching the film if necessary, the film is wound around the yarn core using a winding device.
The diameter distribution of the film roll being wound is detected, and corresponding to the detected diameter distribution, necessary parts of the heating means and/or cooling means are independently controlled, and the thickness of the film and the outer diameter of the roll are adjusted. How to adjust.

(3) In one example, when a film is manufactured by a calendar molding method, the diameter distribution of the film roll during film winding is detected, and the measured value is used by a roll spacing adjustment device and a roll bending method that bends one roll at the center. A method of adjusting the film thickness and roll outer diameter by giving feedback to the equipment, 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 wound onto a yarn core using a winding device, and the diameter distribution of the film roll during winding is detected. , heating and/or cooling means by independently controlling necessary parts of the heating means and/or cooling means.
Or a method of cooling and adjusting the film thickness and roll external dimensions.

In both of the above examples, the diameter distribution of the film roll during winding is detected.

For this purpose, any known method can be used without restriction, including a method using a tape measure, a method using a device that utilizes the straightness of electromagnetic waves such as a laser or infrared rays, and absorbance.

The present invention is as described above, and has particularly remarkable effects as described below, and its industrial utility value is extremely high.

(1) The rolled film according to the present invention is
Since the length of the film is 300 m or more, it is not only possible to reduce the frequency of attaching and detaching the rolled material during the work process, but also to reduce film loss due to so-called edge cutting.

(2) The roll-shaped film according to the present invention is
It eliminates uneven edges at both ends, and adjusts the difference in outer circumference at both ends, the difference in outer circumference near both ends, and the difference in outer circumference in the center to a specific range, so even if the film is long or wide, Regardless, when unwinding the nine rolls and gluing the ends of two films together by a relay operation,
Undesirable phenomena such as sagging of the film and bending of film edges do not occur.

(3) When the roll-shaped product of the present invention is bonded and expanded by an intermediary operation and the film is coated on a house frame, it can be preferably tensioned without causing any sagging areas.

Hereinafter, the present invention will be explained in detail based on examples, but the present invention is not limited to the following examples unless it exceeds the gist thereof.

Example/ Raw materials and resin additives consisting of polyvinyl chloride (〒-/, 3oo) 10 parts by weight dioctyl phthalate 1 l Qrr barium-zinc stabilizer 3 were weighed. After kneading these for 10 minutes with a super mixer, /g! ;Kneaded on rolls heated to C, and then kneaded using an L-shaped calender device consisting of three rolls, width +2.10C1n, thickness 0.1
mm film, about 1 mm on a paper core with a diameter of q/+++ m.
It was wound into a roll at a speed of 0.0 mm and 1 minute to have a length of tioom. On the last roll of the L-shaped calender, a plurality of air blowing nozzles are arranged along the roll surface at intervals of 2 ocm, each of which can be independently controlled;
The diameter distribution of the film roll being wound up was detected, and the thickness of the film and the outer circumferential dimension of the film roll were adjusted in accordance with the detected diameter distribution while adjusting the amount of air blowing.

3 cm from both ends of the resulting film roll
I cut it piece by piece with a cutting blade. The outer circumference of each rolled product was measured at intervals of 20α from one end. The results are shown in Table 7.

Two of the obtained rolls were prepared, and as shown in FIG. 1, a relay operation was carried out at the ends of the film. When the relay margin was set to 2 cm and when the S side was used, the feasibility and difficulty of the relay operation were evaluated, and the results are shown in Table 1.

In Table 1, the evaluation criteria for the feasibility and difficulty of relay operations are as follows.

"○"...The relay operation is extremely easy and does not require manual assistance.

"M"...The relay operation is not easy and requires manual assistance.

"X"...Due to sagging and bending of the film edges, the relay operation is difficult, and even with manual assistance, adhesion is not possible.

Comparative Examples 7 to S The same formulation as described in Example/ was used, the same calender device used for rolling was used, and the film thickness was determined based on the experience of a skilled worker without blowing air with an air blowing nozzle. It was made into a film while being corrected.

In Examples/--3, both ends of the rolled film were not cut with a cutting blade, and in Comparative Examples G and Shio, both ends of the rolled film were cut with a cutting blade. 20 c from one end per roll on each side
The outer circumference was measured at m intervals. The results are shown in Table 1.

On each side, prepare two rolls of the obtained material,
As shown in FIG. 2, a film edge relay operation was performed. When the relay margin was set to 2 cTn and 30 cTn, the feasibility and difficulty of the relay operation were evaluated, and the results are shown in Table 1.

The evaluation criteria were the same as those described in Examples.

From Table 7, the following becomes clear.

(1) The rolled film according to the present invention has less bending at the film end, and even if the width of the film splicing margin is narrowed, the splicing operation can be easily performed.

(2) On the other hand, the rolled film of Comparative Example had irregular film edges (Comparative Example/, C, 3), and the difference in the outer circumference of the rolled film was large. As a result, the edges of the film are bent, and even if the film splicing margin is widened, the splicing operation cannot be easily performed.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of an example of a rolled film according to the present invention, and FIG. 2 is a perspective view of an example of a rolled film according to the present invention, and FIG. FIG. In the figure, // is a film, 12.2 Hayu 3 is a rolled film, /3 is a yarn core, Ao, B
o are both ends of the rolled film, A4
IB. are each A. ,B. The inner part of fQcm from 22.2'l is the supporting shaft of the film roll 1.25 is the intermediate part, 2
Reference numeral 6 indicates a high-frequency sewing machine, 27 indicates a bonded portion, and arrows indicate the unwinding direction of the rolled film. Applicant Mitsubishi Monsanto Chemicals Co., Ltd. Agent
Patent Attorney Hase -

Claims (1)

[Claims] (11 Length over 300m, width / 00-300c
In a roll-shaped product of a long and wide agricultural vinyl chloride resin film, the irregularities at both ends of the roll-shaped product are substantially removed, and the outer circumferential dimensions of both ends of the roll-shaped product are The difference between the two ends of the rolled material is within 10 cm, and all the outer circumferential dimensions of the section between both ends of the rolled material and the position lIOcm inside from these ends are from -s mm to the outer circumferential dimension of each end. All outer circumferential dimensions of the sections that are within the range of +7QTMn and sandwiched between two positions 11QQn inside from both ends of the rolled material are from -58 to -58 with reference to the outer circumferential dimension of one of both ends. A roll-shaped product of agricultural vinyl chloride resin film, characterized in that the film is within the range of +/3wn.