JPS59219337A - Windup roll for polyamide film used in metallization - Google Patents

Abstract

PURPOSE:To provide the titled roll which does not form longitudinal wrinkles, by winding up a specified biaxially oriented polyamide film. CONSTITUTION:An inorg. particle, e.g. silica, an org. high-molecular material particle, e.g. PP, etc. are added to a polyamide such as an aliph. polyamide or an alicyclic polyamide having a cyclohexane ring. The mixture is melt-extruded and biaxially oriented to obtain a biaxially oriented polyamide film. If necessary, one side of the film is coated with a lubricant such as polymethylsiloxane. The other side of the film is then metallized to obtain a film having a coefficient of dynamic friction of 0.6 or below and a coefficient of static friction of 0.7 or below as measured at 23 deg.C and RH of 50%. The film is wound up in a roll length of 6,000m or longer.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a winding roll of polyamide film for metallization.

The friction coefficient of commercially available biaxially stretched polyamide films is relatively large and the lubricity is not good, but the polyamide film itself, a printed film, a film laminated with polyolefin, etc. is wound into a long roll. No wrinkles will occur on the roll. Therefore, for example, a biaxially oriented polyamide film with a thickness of 15 microns and a width of less than 1000 am has a roll length of 4000 to 8
It is handled as a 1,000m long winding roll.

However, when a biaxially stretched polyamide film is wound onto a full-length roll of a metal-deposited polyamide film with a metal such as aluminum vacuum-deposited on its surface, vertical wrinkles slightly inclined with respect to the direction perpendicular to the axis appear on the roll surface during winding. This is easy to occur, and when the wrinkles that occur accumulate and become protrusions, it becomes impossible to roll them up any further. In particular, as the winding progresses and the length of the film on the winding side becomes longer, the frequency of wrinkles on the first winding roll increases. For example, it has been impossible to wind up a biaxially stretched polyamide film having a thickness of 15 microns and aluminum vapor-deposited onto a roll having a winding length of 6000 m or more. Therefore, as a biaxially stretched polyamide film for aluminum deposition, one roll length is 6.
Since it is supplied to a low tVk vacuum evaporation pot with a length of less than 1,000 m, the vacuum evaporation cost is not high, and the roll length is 6,000 m.
Since it is used for post-processing of vapor-deposited films of F72 or lower, there have been problems such as reduced workability in post-processing.

In order to solve the above problem, the present inventors investigated the conditions for winding the film in the vacuum deposition pot, such as the film tension during winding, the contact pressure of the pressure roll during winding, and its angle. However, I could not obtain satisfactory results.

Therefore, we further investigated the characteristics of polyamide film,
By keeping the coefficient of friction of the film below a predetermined value,
A winding roll of metallized polyamide film with a winding length of 6000 m or more was obtained.

That is, the present invention is a polypolyamide film lifting roll for metal deposition, in which a biaxially oriented polyamide film having a static friction coefficient of 0.7 or less and a dynamic friction coefficient of 0.6 or less is rolled up to a length of 6000 m or more.

The values of the static friction coefficient and dynamic friction coefficient of the biaxially stretched polyamide film in this invention are values measured between the same film surfaces in an atmosphere of 23° C. and 150% RH according to the method of ASTM-D-1894.

If the coefficient of static friction exceeds 0.77z and the coefficient of dynamic friction exceeds 0.6 and the slipperiness decreases, it is impossible to avoid the occurrence of wrinkles when the metallized film is rolled up more than 6000772 times. By reducing the friction coefficient of the biaxially stretched polyamide film and improving its sliding properties,
The reason for this is that wrinkles are prevented from forming when the metal-deposited film is rolled up into a roll shape.The reason for this is not clear, but the improvement in the slipperiness between the polyamide film surface and the metal-deposition surface prevents the formation of wrinkles when rolled up into a roll shape. This is thought to be because the vertical wrinkles that occur during winding disappear instantaneously, and as a result no protrusions are formed.

The biaxially stretched polyamide film used in this invention is
Nylon 6, nylon 66, nylon 11% nylon 1
Homopolymers such as aliphatic polyamides such as No. 2 aliphatic polyamides, alicyclic polyamides having a cyclohexane ring, aromatic polyamides of aliphatic diamines and aromatic dicarboxylic acids, and their constituent units? A biaxially stretched film obtained by melt-extruding a copolymer as the main component and a mixed polyamide thereof through a die using a known method, and then simultaneously biaxially stretching, sequentially biaxially stretching, or blow stretching. .

As a means to reduce the coefficient of friction of a biaxially stretched 4-polyamide film, inorganic particles such as silica, talc, alumina, clay, mica, calcium carbonate, or polycarbonate, polyethylene terephthalate, polytetramethylene ethylene terephthalate) can be added to the polyamide. , 1,4-cyclohexane terephthalate, polyethylene-2,6-dinaphthalate, polyethylene, polypropylene, ionomer, ethylene/hinyl acetate copolymer, polystyrene, polymethyl methacrylate, etc. are added, Additionally, surfactants such as 1,5-sorbitan aliphatic ester, ethylene bisnutearylamide, stearic acid monoglyceride, and calcium stearate may be added.

Furthermore, a method of applying a slipping agent such as polymethylsiloxane to the surface of the biaxially stretched polyamide film may be used. When applying a slip agent, it may be applied either before or after biaxial stretching is completed.

Metal is deposited on the surface of the film obtained as described above that is not treated with slipperiness.
Chemical treatment and flame treatment in advance.

It is common to perform activation treatment such as corona discharge treatment.

Further, in order to improve the evaporation temperature between the polyamide and aluminum, the anchor agent may be entirely coated.

This invention will be explained in detail below.

Example 9 Using 6% by weight sulfuric acid, concentration 1 fl/dl, temperature 25
Fine silica powder (average particle size 2.5
Nylon 6 for film production with different contents of fine silica powder was prepared by mixing 10 parts by weight of Nylon 6' with a master chip containing 10 parts by weight of Nylon 0:/6'. This film manufacturing nylon 6 was melted by heating to 275°C, extruded from a die onto a chill roll cooled to 20°C, and cooled to obtain an unstretched film with a thickness of 200 microns. 55°C1 magnification 3
．． Stretch in the longitudinal direction at 3x, then approximately 120°C, 1x magnification 4
．． The film was stretched in the transverse direction at 1× and then heat-set at 210° C. to obtain a biaxially stretched nylon 6 film with a thickness of 15 microns. The total width of this biaxially stretched nylon 66 film is 15a.
After making a slit at O,my, aluminum was vapor deposited and 1
Judgment is made based on the winding length that can be wound, and the results are shown in the table below.

As shown in the table above, sample numbers 3 and 4 with a static friction coefficient of 0.7 or less and a dynamic friction coefficient of 0.6 or less did not cause vertical wrinkles on the aluminum vapor-deposited rolls even when rolled up to a winding length of 2000 mm or more. In addition, sample number 1.2 with poor slipperiness
could not be hoisted above 6000m.

By using the winding row/l/'i of this invention, it is possible to wind up a metal-deposited film to a winding length of 6000 m or more, so that the work efficiency in the metal-deposition process and the post-processing process of the vapor-deposited film is reduced. There isn't.

Patent applicant: Toyobo Co., Ltd. Agent: Patent Attorney Takeo Sakano

Claims (1)

[Scope of Claims] [1] A roll of $Hg stretched polyamide film for metal deposition, which is a biaxially stretched polyamide film having a static friction coefficient of 0.7 or less and a dynamic friction coefficient of 0.6 or less, wound to a length of 6000 z or more. Upper Keror.