JPS6325025A - Rolling of thermoplastic resin film - Google Patents

Abstract

PURPOSE:To improve suitability for rolling as the whole of a material to be rolled and obtain an extremely thin rolled film, by a method wherein the sheet of the outermost layer in the material to be rolled, which is in contact with a roll, is made of crystalline resin and the thickness thereof is made equal to the same of the sheet of an intermediate layer or less. CONSTITUTION:Three sheets of thermoplastic resin sheets 2, 3, 4 are laminated by employing a pair of guide rolls 5, 6. Two sheets of the sheets 2, 4 of the outer layers of the material 1 to be calendered are made of crystalline thermoplastic resin while the sheet 3 of the intermediate layer of the material 1 to be rolled is made of the thermoplastic resin and the thickness thereof should be equal to or less than the thicknesses of either one of the sheets 2, 4 of the outer layers. The sheets 2, 4 of the outer layers which are contacted with rolls 7, 8, are made of crystalline resin, therefore, a film can be rolled well and a thin film may be obtained even when the noncrystalline hard resin sheet, not excellent in a suitability for rolling, is employed for the intermediate layer.

Description

Detailed Description of the Invention [Field of Industrial Application] The present invention relates to a method of rolling a thermoplastic resin sheet with a pair of rolling rolls to obtain a rolled sheet or film, and particularly relates to a method for obtaining a rolled sheet or film of 10 μm or less. The present invention relates to a method suitable for obtaining rolled sheets, films, etc. made of non-quality hard resins.

[Prior art and its problems]

BACKGROUND ART Conventionally, a method of obtaining a rolled sheet or film by compressing and rolling a sheet or film of a thermoplastic resin such as polyolefin between rolling rolls at a temperature below its crystal melting point or softening point has been widely practiced. This rolled sheet,
Films have good molecular orientation, are transparent, and have excellent mechanical properties, so they are used as packaging materials for foods, M-carts, and the like.

However, with the conventional rolling method, it is difficult to obtain an ultra-thin film with a thickness of 10 μm or less.
There has been a problem in that it is extremely difficult to obtain rolled sheets and films of hard, non-quality resins such as polymethyl methacrylate and polyarylate. Further, when rolling is attempted at a high rolling reduction ratio, the thickness of the sheet or film to be rolled must be increased, which poses many difficulties in handling during work.

[Means for solving problems]

Therefore, in this invention, three thermoplastic resin sheets are used.
The above-mentioned problems were solved by stacking two or more sheets and rolling them, and by making the outermost layer sheet from a crystalline resin and having a thickness equal to or greater than that of the intermediate layer sheet.

Hereinafter, the present invention will be described in detail with reference to the drawings.

FIG. 1 shows an example of the rolling method of the present invention, and reference numeral 1 in the figure indicates a product to be rolled. This rolled object 1 is made by stacking three thermoplastic resin sheets 2, 3.4,
In this example, the respective thermoplastic resin sheets 2, 3.4 are superimposed using a pair of guide rolls 5.6. The two sheets 2 and 4 of the outer layer of the rolled product 1 are
Both sheets 2 and 4 must be made of crystalline thermoplastic resin, and each sheet 2 and 4 may be made of the same resin or different resins as long as they are crystalline. The thicknesses may be the same or different. The intermediate layer sheet 3 of the rolled product 1 may be crystalline or non-crystalline, hard or soft, as long as it is made of thermoplastic resin, but the thickness It is necessary that the thickness be equal to or thinner than the thickness of either sheet 2, 4 of the outer layer. Outer layer sheet 2
, 4 are thinner than the intermediate layer sheet 3, the outer layer sheet 2.4 may break or fold, resulting in uneven rolling. Therefore, as modified examples, the three sheets 2, 3.4 constituting the rolled object 1 are made of the same crystalline resin, and the three sheets 2゜3.4 all have the same thickness. Can be mentioned.

The crystalline resin constituting the outer layer sheet 2.4 or the intermediate layer sheet 3 has a crystallinity of 30% or more, preferably 40% or more, and specifically, polyethylene, polypropylene, polybutene-1, etc. , polyolefins containing olefin-based copolymers such as poly4-methylpentene-1, polyvinylidene fluoride, polytetrafluoroethylene, tetrafluoroethylene-hexafluoropropylene copolymer, tetrafluoroethylene-ethylene copolymer, etc. Fluororesin, 6-nylon, 6-row nylon, 1
Crystalline polyamide resins such as 0-nylon and 12-nylon, crystalline polyester resins such as polyethylene terephthalate and polybutylene terephthalate, polyacetal resins, liquid crystal thermoplastic resins having a liquid crystal component in the main chain or side chain, polyether ether ketone Examples include resin.

In addition, examples of thermoplastic resins that can become the sheet 3 of the intermediate layer include polystyrene, polymethyl methacrylate, polyarylate, acrylonitrile-styrene copolymer <As resin), ABS resin,
Vinyl chloride resin, polycarbonate, vinyl acetate resin,
Thermoplastic polyurethane resins are used, and resins such as hard polystyrene, polymethyl methacrylate, and polyarylate, which cannot be formed into thin films by conventional rolling methods, are particularly suitable.

The object to be rolled 1 is simply three sheets 2.3.4 stacked one on top of the other, and must not be fused or adhered to each other so that they cannot be separated.

The article 1 to be rolled is then sent to a pair of rolling rolls 7.8 and rolled. The temperature of the rolled material 1 during this rolling is:
The temperature is below any crystal melting point or softening point of the resin constituting the rolled object 1. Further, the circumferential speeds of the respective rolling rolls 7.8 may be the same or different. The rolling reduction ratio is usually 30 to 90%, and even if a high rolling reduction ratio is used, rolling can be performed satisfactorily without any inconvenience. Roll roll 7
As the rolling mill 8, in addition to the two-stage type shown in FIG. 1, a two-stage continuous type, a four-stage type, a six-stage type, a Sendzimir type, etc. rolling roll can also be used.

The rolled product 1 after rolling is taken off by a take-off roll (not shown). The take-off speed is set to be higher than the rolling delivery speed of the rolling rolls 7.8, but it is preferably suppressed to such an extent that the width of the rolled object 1 after rolling does not decrease.

The rolled material 1 taken off by the take-up roll is wound up as it is or is separated into three rolled sheets and then wound up respectively. The rolled sheet may then be separated into three rolled sheets. separated 3
Each of the rolled sheets can be made into a desired product, or only one sheet of the intermediate layer can be made into a desired product. Rolling may be performed by changing the combination, their thickness, rolling conditions, etc. as appropriate.

[For production]

According to such a thermoplastic resin rolling method, since the outer layer sheet 2゜4 in direct contact with the rolling roll 7.8 is made of a crystalline resin, the intermediate layer is made of a material having poor rolling suitability, such as polystyrene. Even if a non-quality hard resin sheet is used, it can be rolled successfully and a thin film can be obtained. This is because the rolling suitability of the crystalline resin during rolling in a solid state is better than that of a non-grade resin, so that the rolling suitability of the object to be rolled 1 as a whole becomes better. Therefore, rolling can be carried out without any inconvenience even at a high rolling reduction ratio, and a thin film can be obtained at the same time. Moreover, even if a crystalline resin sheet is used for the intermediate layer, it can be rolled well, and a thin film of 1 μm or less can be efficiently obtained, and sheets of different thickness combinations can be used for the outer layer sheet 2.4. For example, the degree of orientation of the intermediate layer sheet 3 can be increased.

FIG. 2 shows another example of the rolled object 1 according to the present invention, and the rolled object 1 of this example has a four-layer structure.

The outer layer 2.4 in contact with the rolling roll 7.8 consists of a crystalline resin, as in the previous example, and the two intermediate layer sheets 9.10 can also be crystalline or non-crystalline (in each case the same or different). The thickness may be equal to or thinner than that of the outer layer sheet 2.4. The rolled product 1 of this example can also provide the same effects as the previous example.

FIG. 3 shows a third example of the rolled object 1 according to the present invention, and the rolled object 1 of this example has a five-layer structure. Of the three resin sheets 11゜12.13 of the intermediate layer, the central sheet (third layer sheet) 12 is made of crystalline resin, and the other intermediate layer sheets (second layer and fourth layer) are made of crystalline resin. The mesh sheets) 11 and 13 are made of non-grade resin. 'Three sheets of intermediate layer 11.12.1
The thickness of sheet 2.3 is equal to or less than that of the outer layer sheet 2.4. In this case, since the crystalline resin sheets are arranged on both sides of the second and fourth layer sheets 11 and 13, good rolling can be achieved. Similarly, the number of layers in the rolled material 1 may be an odd number, such as 7 layers, 9 layers, etc., and the sheet of the odd layer may be a crystalline sheet. Moreover, all three sheets 11, 12, and 13 of the intermediate layer can be made of non-grade resin, or all of them can be made of crystalline resin.

〔Example〕

(Example 1) Three polyethylene sheets with a density of 0.96 y/cm and a thickness of 0.35 M and two polypropylene films with a thickness of 30 μm were prepared, and the polypropylene films were placed between the polyethylene sheets and overlapped, Rolling temperature 10
It was rolled at 0° C. using a rolling roll. The circumferential speed of the rolling rolls is the same, the take-up speed is the same as the rolling delivery speed,
The rolling reduction ratio was set to 75%.

After rolling, the rolled product was immersed in methanol to separate each layer. The thickness of the rolled propylene film was 7μ.

On the other hand, when only the polypropylene film was rolled under the above rolling conditions, the polypropylene film broke. The rolling reduction ratio for good rolling was determined to be approximately 15%, and the thickness at that time was 26 μm. Further, the crystallinity obtained by the density method was 58% for polyethylene and 40% for polypropylene.

(Example 2) A polyvinylidene fluoride resin film having a thickness of 100t1m and a thickness of 180um and 1300tlTrL was prepared.

The crystal form of these films as determined by X-ray diffraction was a ■-shaped product, and the degree of crystallinity as determined by density method was 35 to 42%.

Then, place a 100 μm film in the center, place a 180 μm film on both sides, and then place a 300 μm film on both sides.
A 5-layer rolled product was prepared by placing a 5-layer film on the film, and this was rolled at 90°C and a reduction rate of 72%.The take-off speed was set to 1.05 of the rolling delivery rate, and after taking off, each layer was rolled. The film was wound up with tension without stretching. The thickness of each film after rolling was 30 μm, 151 μm, and 85 μm.

On the other hand, I bought a 300μm film in the center, a 180μm film on both sides, and a 100μm film on both sides.
When a product to be rolled having a 100 μm film arranged thereon was rolled under the same conditions, the outer 100 μm film was broken, folded, etc., and suitable rolling could not be performed.

(Example 3) Polymethyl methacrylate having a heat distortion temperature of 110° C. at 455 kPa according to ASTM-D-648 was calendered to prepare a sheet having a thickness of 0.3NR. Next, an extruded sheet of polypropylene with a thickness of 0.5 seconds was made, and a polymethyl methacrylate sheet was sandwiched between the two sheets.
It was rolled at 110°C. Using a rolling roll with a diameter of 150a+, the circumferential speed ratio was 1=2, and the rolling delivery speed was 1711/min.
The reduction rate was 5%.

The thickness of the obtained rolled polymethyl methacrylate film was 150 μm.

On the other hand, only a polymethyl methacrylate sheet was rolled under the same conditions, but the sheet broke and other problems resulted in poor rolling.

(Example 4) Polyethylene terephthalate was extruded into a 0.1-order film.

In addition, we extruded polyacetal to a thickness of 100 μm and 15
A film of 0 μm was obtained.

' One polyethylene terephthalate film was sandwiched between two polyacetal films and rolled at 130° C. between rolls having the same circumferential speed at a rolling reduction of 60%. in this case,
The experiment was conducted both when the thickness of the two polyacetal films of the outer layer was the same and when they were different.

When the degree of orientation of the rolled polyethylene terephthalate film was measured by an X-ray diffraction method, the degree of orientation of the crystal C axis in the rolling direction was higher when the thickness of the outer layer polyacetal film was changed.

In addition, a film with a thickness of 150μ of poly4-methylpentene-1 was made, and this film and 150μ of polyacetal were used.
One 100 μm film of polyethylene terephthalate was sandwiched between the 0 μm tile film and rolled under the rolling conditions described above. The degree of orientation of the crystal C axis of the rolled polyethylene terephthalate film was 8 compared to that of the same resin film of the same thickness as the outer layer.

(Example 5) A polyarylate having a heat distortion temperature of 175° C. of 1820 kPar according to ASTM-D-648 was thermally calendered at 245° C. to form a sheet of 0.4511II+Iw. Further, nylon 66 having a crystal melting point of 260° C. was made into a sheet with a thickness of 0.60 iu by T-die extrusion.

Sandwich the polyarylate sheet between the nylon 66 sheets and it! Rolling was carried out at 185° C. and at the same roll circumferential speed with a reduction ratio of 50%. The thickness of the polyarylate sheet after rolling was 0.25 m++. This sheet was sandwiched between 0.60 mm nylon 66 sheets, and rolled at a rolling reduction of 40% using the same properties as described above. The thickness of the obtained polyarylate sheet was 150 μm. This sheet was again sandwiched between 0.6 M thick nylon 66 sheets and rolled under the same conditions at a rolling reduction of 35%, resulting in a polyarylate having a thickness of 100 μm.

With a 0.45 IuR thick sheet of polyarylate alone,
Rolling was attempted at a temperature of 185° C., but the rolling reduction ratio at which good rolling could be achieved was about 15%. Rolling is performed multiple times, 15
I tried to make the thickness 0tlTrL, but even after rolling 30 times, the thickness was 0.28! It was only possible to reduce the amount to nm.

〔Effect of the invention〕

As explained above, the method for rolling a thermoplastic resin film of the present invention involves stacking three or more thermoplastic resin sheets to form a rolled object, and forming the outermost layer of the rolled object from a crystalline resin. In addition, since the thickness of the outermost layer sheet is equal to or greater than the thickness of any intermediate layer sheet, and this rolled object is rolled with a rolling roll, the rolling suitability of the rolled object as a whole is improved. becomes good, and as a result, (
b) It is possible to obtain an extremely thin rolled film that could not be rolled conventionally.

(b) It is possible to obtain a rolled film of poor quality hard resin that could not be peeled in the past.

(c) Good rolling is possible even at a high rolling reduction, and a thin film can be obtained.

(d) By mutually changing the thickness and type of resin of the outermost layer, the degree of crystal orientation of the crystalline rolled film of the intermediate layer can be increased.

(e) A plurality of rolled films having different thicknesses can be obtained by rolling for - times.

It has the following advantages.

[Brief explanation of the drawing]

FIG. 1 is a schematic structural diagram showing an example of the rolling method of the present invention, and FIGS. 2 and 3 are both schematic sectional views showing structural examples of the rolled object in the present invention. 1... Rolled product, 2... Thermoplastic resin sheet (made of crystalline resin), 3... Thermoplastic resin sheet, 4... Heat Plastic resin sheet (made of crystalline resin), 7.8... Rolling roll.

Claims (1)

[Scope of Claims] A method of rolling a rolled product made by stacking three or more thermoplastic resin sheets with rolling rolls at a temperature below the crystal melting point or softening point of any of these resin sheets, comprising: Rolling of a thermoplastic resin film, characterized in that the outermost sheet in contact with the inner rolling roll of the object to be rolled is made of a crystalline resin, and its thickness is equal to or greater than the thickness of any intermediate layer sheet. Law.