JPH06218809A - Manufacture of vinyl chloride resin film - Google Patents

Abstract

PURPOSE:To obtain a film having cross-sectionally triangular grooves on both faces thereof with high workability by feeding a film having a specific temperature to a first embossing roll having a specific surface temperature to emboss one face of the film and then feeding the film having a different temperature to a second embossing roll having a different surface temperature to emboss the other face thereof. CONSTITUTION:Angles A and B which will be assumed with respect to film faces are set to A1, A2, B1 and B2. In the case where a film having grooves of 10 deg.<=A<=60 deg. and 20 deg.<=B<=90 deg. is produced, a film whose temperature is 110 to 150 deg.C is fed to a first embossing roll whose surface temperature is 20 to 50 deg.C to emboss one face of the film. Then, the film whose temperature is varied to 0 to 70 deg.C is fed to a second embossing roll. whose surface temperature is 100 to 130 deg.C, or the film whose temperature is varied to 90 to 120 deg.C is fed to the second embossing roll whose surface temperature 20 to 50 deg.C, to emboss the other face of the film.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing a vinyl chloride resin film having grooves having a specific shape on both sides. Specifically, by forming grooves on both sides of the film, the contact area is reduced to prevent the films from sticking together,
The present invention relates to a method for producing a vinyl chloride resin film which is a film having improved workability and which has a function of adjusting the amount of incident light of the film. More specifically, it relates to a method for producing a film used as an agricultural film.

[0002]

2. Description of the Related Art Conventionally, as an agricultural film embossed on both sides of the film, there are a satin film and a silk film. The satin-finished film is processed on both sides simultaneously by pressing it between an embossing roll having a random embossing shape and a back roll which is a rubber roll containing sand. The embossing roll of the silk-textured film also has a specific shape, but both sides are processed at the same time as the satin finish.

However, when the film surface is embossed, a specific embossed shape, which is groove-shaped and has a triangular groove cross-section and the angle formed by each inclined surface is defined, is formed on both sides of the film at a time. It could not be processed in the same way. Also, when embossed on each side,
The embossed shape processed first may collapse or disappear, and it has been difficult to perform groove-shaped embossing having a specific shape on both sides of the film, as in the present invention.

[0004]

SUMMARY OF THE INVENTION In such a situation, the present inventors do not emboss a specific shape on both surfaces at once, but first emboss one surface and then the opposite surface first. It is an object of the present invention to provide a method for producing a film that can be embossed while maintaining the embossed shape.

[0005]

However, the gist of the present invention is that both sides of the vinyl chloride resin film are
Angles A and B formed by the two slanting surfaces of the triangle, which are parallel to each other and which are triangular and which are formed by the groove cross section, and which face the film surface, satisfy the following relational expression:

## EQU2 ## A <B 10 ° ≦ A ≦ 60 ° 20 ° ≦ B ≦ 90 °, the groove depth is 1/50 to 1/10 of the film thickness, and the groove width is 5 to 50 μm. In the method for producing a film having a groove in which the total area of the groove area occupies 30% or more of the area of the film surface,
A film having a film temperature of 110 to 150 ° C. was supplied to a first embossing roll having a roll surface temperature of 20 to 50 ° C., one surface thereof was embossed, and the obtained film was continuously subjected to (1 ) Film temperature 0-70 ℃
As a result, the roll surface temperature is supplied to the second embossing roll whose temperature is not higher than the temperature of the film supplied to the first embossing roll and is 100 to 130 ° C., or (2)
By supplying the film temperature to the second embossing roll having a roll surface temperature of 20 to 50 ° C., which is lower than the temperature of the film supplied to the first embossing roll by 10 ° C. or more and 90 to 120 ° C., the other The present invention relates to a method for producing a film having grooves having a specific shape on both sides, characterized in that the surface of the film is embossed.

Here, the angles A and B formed by the inclined surface of the groove and the film surface are the angles A ₁ , A ₂ and B ₁ , B _{2 in FIG.}
Means The present invention will be described in detail below. In the present invention, the vinyl chloride-based resin means a copolymer of polyvinyl chloride and other monomer mainly containing vinyl chloride, a mixture thereof, or a mixture of these with another polymer or copolymer.

In the present invention, vinyl chloride resin 100
30 to 70 parts by weight of a commonly used plasticizer is blended with respect to parts by weight. Furthermore, if necessary, additives usually added to vinyl chloride resins, such as anti-fog agents, anti-fog agents,
Lubricants, heat stabilizers, antistatic agents, UV absorbers, and colorants can be added. These additives are added in a usual amount, for example, 10 parts by weight per 100 parts by weight of vinyl chloride resin.
It can be used in parts by weight or less.

In order to produce a film from a vinyl chloride resin, each necessary amount is weighed, and a ribbon blender, a Banbury mixer, a super mixer, other compounding machines,
The composition may be blended using a mixer, and then the obtained composition may be formed into a film by a method known per se, for example, an inflation method, a calender molding method, a solution casting method or the like. If the thickness of the film is too thin, the strength will not be sufficient, and if it is too thick, it will be inconvenient for work such as cutting, bonding and spreading.
It is preferably in the range of 0.2 mm.

In the present invention, the angles A and B formed by the two slanting surfaces of the triangle, which are parallel to each other and have a triangular cross-section formed by the straight grooves, and the film surface are:

## EQU3 ## The relational expression of A <B 10 ° ≦ A ≦ 60 ° 20 ° ≦ B ≦ 90 ° is satisfied, and the depth of the groove is 1 of the film thickness.
/ 50 to 1/10, the width of the groove is 5 to 50 μm, and the total area of the groove area is 3 with respect to the area of the film surface.
Embossing is applied to both sides of the vinyl chloride resin film so as to occupy 0% or more.

In the present invention, the groove area means a projection surface on which the groove portion is projected on the film, and the total area of the groove area is 30% or more of the surface area of the film, and further 50%.
The above is preferable. The shape of the groove may be the same on both sides or different. The embossing process is performed by feeding an untreated film between an embossing roll (made of metal) and a rubber roll which rotate in opposition to each other and pressing them.

As a method of manufacturing the embossing roll, there is a method of manufacturing the metal roll by photoelectroforming (combination of photoresist and electroforming) or the like, even if the metal roll is directly processed by laser irradiation or ion beam. In order to produce a film having grooves of a specific shape on both sides, in the present invention, first, a film having a film temperature of 110 to 150 ° C. is applied to a first embossing roll having a roll surface temperature of 20 to 50 ° C. Supply and emboss on one side. In order to apply embossing to the opposite surface, (1) a film having a film temperature of 0 to 70 ° C., whose roll surface temperature is not higher than the temperature of the film supplied to the first embossing roll and is 100 to 130 ° C. Supply to two embossing rolls, or
(2) The film temperature is lower than the temperature of the film supplied to the first embossing roll by 10 ° C. or more and 90 to 120.
The film having a temperature of 0 ° C. is supplied to a second embossing roll having a roll surface temperature of 20 to 50 ° C.

In order to bring the temperature of the film to 90 to 150 ° C., it may be heated by, for example, various heaters, heating rolls, hot air or the like. Moreover, the surface temperature of the embossing roll is set to 1
In order to set the temperature to 00 to 130 ° C., the roll may be heated with, for example, steam or warm water. In the embossing, the line speed and the embossing pressure (pressure between the embossing roll and the back roll) may be the conditions for ordinary embossing. Specifically, the line speed is 5 to 120 m /
It is preferable that the pressure is 0.2 to 20 kg / cm.

Since the film obtained by the present invention has grooves having a specific shape on both sides, adhesion between the films is prevented and workability is improved. Further, since the groove has a specific shape, it also has a function of adjusting the amount of incident light on the film. Therefore, the film produced by the present invention is particularly suitable as a film for agricultural houses or tunnels. Further, it is extremely useful not only for agricultural and horticultural purposes but also for windows of buildings.

[0014]

EXAMPLES The present invention will be described below based on examples, but the present invention is not limited to the following examples as long as the gist thereof is not exceeded. Examples 1-2, Comparative examples 1-2

[0015]

Table 1 I. Production of film Polyvinyl chloride (average degree of polymerization 1300) 100 parts by weight Di-2-ethylhexyl phthalate 45 parts by weight tricresyl phthalate 5 parts by weight Epoxy resin plasticizer (Epicoat 828) 2 parts by weight Barium-zinc composite liquid stabilizer 1 part by weight Barium stearate 0.2 parts by weight Zinc stearate 0.4 parts by weight Ethylene bisstearamide 0.3 parts by weight Sorbitan monostearate 2 parts by weight Blended with benzophenone ultraviolet absorber 0.2 parts by weight, Mixed with a spur mixer. 1 of this mixture
It is supplied to a calender roll heated to 80 ° C. and has a thickness of 0.
A 1 mm film was produced.

II. Formation of groove The diameter is 210 m by photoelectroforming.
An embossing roll having a surface profile of m and a groove pitch and groove depth as shown in Table 1 was prepared. As shown in FIG. 3, the film produced in the above I was exposed by an infrared heater.
The film heated to the temperature shown in 2 was placed between a water-cooled embossing roll (α) at 25 ° C. and a smooth rubber roll at 0.5 kg.
Between the embossing roll (β) and the smooth rubber roll heated to the temperature shown in Table 2 with steam after embossing on one side by passing with a pressure of / cm (in Example 2,
The film is heated again to 110 ° C, and the film that has been embossed on one side is placed between the water-cooled embossing (β) and the smooth rubber roll at 25 ° C so that the first embossed surface comes to the smooth rubber roll side and The roll (β) and the smooth rubber roll were passed with a pressure of 0.5 kg / cm to emboss the opposite surface. The surface shape of the obtained film was measured by a three-dimensional surface roughness meter (TOPO-3D) manufactured by Matsu Trading Equipment Co., Ltd., and the area of the groove region was calculated by the power spectrum.

III. Evaluation of Film 1. Method for measuring light quantity adjusting ability A film having a groove portion of the present invention was spread on the roof portion of the gable type model house shown in FIG. 4 so that the length direction of the groove was parallel to the ridge direction of the house. Was produced.
Also, as a control, a similar house in which a film having no groove was spread was prepared.

Three photon sensors (IKS-25 manufactured by Koito Industry Co., Ltd.) were installed on the inner floor surface of each house at intervals of 15 cm in the direction perpendicular to the ridge. Each house was arranged so that the ridges face east-west. The measurement was carried out on a farm in Aichi Prefecture on a clear day in September 1992, assuming the summer solstice and winter solstice at that time. The house was tilted north-south so that it was at the same angle. The measurement data shows the amount of light incident on the control house at 1
The relative values when 00 is shown in Table-2.

2. Evaluation of Adhesiveness A 40 cm square film is cut out from the roll-like material, folded into four and stacked, and a load of 20 kg is applied on this, 4
The film was left standing for 24 hours in an atmosphere kept at 0 ° C., a load was applied, and the state of adhesion between the film surfaces when the film was unraveled was observed.

The evaluation results shown in Table 2 have the following meanings. ◯: Almost no tackiness △: Some tackiness X: Remarkably tackiness

[0021]

[Table 2]

[0022]

[Table 3]

[0023]

According to the manufacturing method of the present invention, a film having grooves of a specific shape having a triangular groove cross section on both sides can be manufactured, and a film having a function of adjusting the incident light amount of the film can be obtained. .

[Brief description of drawings]

FIG. 1 is a schematic sectional view of an example of a film of the present invention.

FIG. 2 is a schematic cross-sectional view of the surface of an embossing roll used in the examples.

FIG. 3 is a schematic view showing the manner of producing the film of the present invention.

FIG. 4 is a schematic diagram of a model house used for film evaluation in Examples.

[Explanation of symbols]

T Film thickness A ₁ , A ₂ , B ₁ , B ₂ Angle between groove inclined surface and film surface P Groove pitch W Groove width D Groove depth P _E pitch D _E depth 1 House 2 Sun in the middle of south 3, 3'and 3 "light receiving part of spectroradiometer 4 and 4'test film 5 and 5'house wall 6 light irradiation angle setting device 7 ground 11 film 12 embossing roll (α) 13 smooth rubber roll 14 embossing roll (β )

Claims (1)

[Claims] 1. A straight groove is formed on both surfaces of a vinyl chloride resin film, and an angle A formed by two inclined surfaces which are parallel to each other and which are opposed to each other and which form a triangular cross section form a film surface.
And B satisfy the following relational expression: A <B 10 ° ≦ A ≦ 60 ° 20 ° ≦ B ≦ 90 ° and the groove depth is 1/50 to 1/10 of the film thickness. In the method for producing a film having a groove having a groove width of 5 to 50 μm and a total area of the groove region occupying 30% or more of the film surface area,
A film having a film temperature of 110 to 150 ° C. is supplied to a first embossing roll having a roll surface temperature of 20 to 50 ° C., one surface thereof is embossed, and the obtained film is continued, (1 ) The film temperature is 0 to 70 ° C, and the roll surface temperature is equal to or lower than the temperature of the film supplied to the first embossing roll and is supplied to the second embossing roll which is 100 to 130 ° C, or (2) The film temperature is lower than the temperature of the film supplied to the first embossing roll by 10 ° C. or more and 90 to 120.
C., the surface temperature of the roll is supplied to a second embossing roll having a temperature of 20 to 50.degree. C., thereby embossing the other surface of the film having grooves of a specific shape on both sides. Manufacturing method.