JP2840552B2 - Laminator having a function to prevent wrinkles of sealing film - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a laminator for bonding a plastic film to an object to be sealed, and more particularly to a laminator having a function for preventing wrinkles of a sealing film which can meet the demand for high precision finishing without wrinkles.

[0002]

2. Description of the Related Art FIG. 8 is an explanatory view (right side sectional view) showing the arrangement of each roller of a recent laminator of this type. In FIG. 8, plastic films 1a and 1b are, for example, transparent films in which polyethylene and mylar are laminated, are fed out from a pair of upper and lower supply reels 2a and 2b, and can be fused by a pair of upper and lower rotary heating rollers 3a and 3b. Heated to a suitable temperature. The pressure rollers 5a and 5b are made of a material having heat resistance and elasticity such as silicon rubber, and the surfaces thereof are finished smoothly.

On the other hand, when a sheet 7 to be sealed placed on an insertion table 6 is inserted between the two leaf films 1a and 1b spread on the pressure rollers 5a and 5b, the pressure rollers 5a and 1b are inserted. 5b is the film 1a, 1b together with the sheet 7.
Is pressed from above and below, and the periphery of the film slightly larger than the sheet 7 is heat-sealed. Film 1 with sheet 7 sealed
a and 1b are supported by a pair of upper and lower pull-out rollers 9a and 9b, and are guided to the right outlet in the drawing to complete the sealing process.

[0004] As a preparatory operation for the above series of steps, the film is unwound from the supply reel 2a on which the upper film 1a has been wound up, the direction is changed by the upper guide roller 4a, and the upper rotary heating roller 3a, the upper pressure roller 5a, and the upper The film is led out to the outside via the draw-out roller 9a, and the film is fed out from the supply reel 2b on which the lower film 1b is wound up, the direction is changed by the lower guide roller 4b, and the lower rotary heating roller 3b, the lower pressure roller 5b, It is guided outside through the lower draw roller 9b. For the upper guide roller 4a and the lower guide roller 4b that change the running direction of the film, a metal rod whose surface is finished smoothly is used.

[0005]

The objects to be laminated are not only protection and reinforcement of conventional cards and sheets, but also protection of the surface of a printed circuit board used for precision electronic components, and the feeling of copying paper and facsimile receiving paper. Recently, there is a tendency that the document recorded on the pressure-sensitive thermal paper is expanded more and more, such as protection for long-term storage of the document, or reinforcement of only one side of the paper to prevent shrinkage for printing. Along with this, the precision required for laminating has been dramatically increased.

Therefore, it is necessary to prevent wrinkles on the film surface from occurring. However, in the prior art, the supply reel 2a that winds up the upper film 1a that unwinds the film and the supply reel 2b that winds up the lower film 1b are only provided with brakes for preventing idling. No means is considered to extend the wrinkles of the wound film between the pressure roller 5a and the pressure roller 5b and prevent the film from being wrinkled. Although the above-mentioned brake has the effect of generating tension in the film running direction, it does not generate tension in the width direction of the film. There was a drawback that generation of phenomena was observed.

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned drawbacks and to provide an upper guide roller and a lower guide roller which are disposed between a film supply reel and a pressure roller. Another object of the present invention is to provide a laminator having a function of preventing wrinkling of a sealing film, which has a function of preventing wrinkles even under conditions in which wrinkles are easily formed by providing a function of spreading wrinkles and preventing wrinkles.

[0008]

According to the present invention, there is provided a laminator having a function of preventing wrinkling of a sealing film according to the present invention. The laminator includes a film winding roller, a guide roller, a rotary heating roller, a pressure roller and a pull-out roller. In the disposed laminator, the guide roller is disposed in the vicinity of a rotary heating roller, and a belt-shaped portion having a different friction coefficient is spirally formed from a central portion to both ends on a surface of the guide roller, and the friction coefficient is formed. The boundary line of the different band-shaped portions is provided so as to spread in the driven rotation direction, and is configured to be supplied to the rotating roller in a state where the film is stretched in the width direction, heated and pressed against the object. ing. A portion of the guide roller having a different coefficient of friction is formed of a plurality of grooved rubber-like material convex portions and grooves, or a rubber-like material having different hardness arranged in parallel. The strips formed or arranged side by side can be formed of a rubbery material that has been surface treated to have different coefficients of friction. The laminator having the function of preventing wrinkling of the sealing film according to the present invention includes an upper film take-up roller, an upper width extending roller having a belt-like portion having a different friction coefficient in a spiral shape from the center toward both ends from the surface,
An upper roller group in which an upper rotating heating roller, an upper pressure roller, and an upper pull-out roller are arranged in this order, and a lower film winding roller, and a belt-shaped portion having a different friction coefficient spirally from a central portion to both ends on the surface. A laminator having a function of preventing wrinkling of a sealing film, comprising a lower width stretching roller, a lower rotation heating roller, a lower pressure roller, and an upper roller group in which a lower pull-out roller is arranged in this order. A guide roller function for changing the direction of the film is given to the width stretching roller and the lower stretching roller, and the film is supplied to each of the rotary heating rollers in a state where the film is stretched in the width direction, and is heated to be sealed. It can be configured to be crimped. In the upper and lower width extending rollers, portions having different friction coefficients of the rollers are formed by convex portions and grooves of a plurality of grooved rubber-like substances, or have different hardness arranged in parallel. It can be formed of a rubber-like material or of a rubber-like material whose side-by-side arrangement has been surface-treated to have different coefficients of friction.

A portion of the guide roller having a different coefficient of friction is formed by a plurality of grooved convex portions P and grooves D of a rubber-like material, or the hardness is arranged in parallel. It is configured to be formed of different rubber-like substances R and r, or to be formed of rubber-like substances that are surface-treated so that the strips arranged in parallel have different friction coefficients.

[0010]

Next, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a perspective view showing a main part of an embodiment of the present invention. However, in FIG. 1, the cover of the apparatus, a frame supporting each roller, a bearing, and the like are omitted at all. The arrangement of the rollers is the same as that of the conventional laminator shown in FIG. 8 (a cross-sectional view showing only a main part when viewed from the right side).

1 and 8, reference numeral 1a denotes an upper plastic film, and 1b denotes a lower plastic film. 2a is an upper film supply reel, and 2b is a lower film supply reel. 3a is an upper rotating heating roller, 3b is a lower rotating heating roller. 4a is an upper guide roller and 4b is a lower guide roller. 5a is an upper pressure roller and 5b is a lower pressure roller. Reference numeral 6 denotes a sealing object guide plate, and reference numeral 7 denotes a sealing object. 9a is an upper pull-out roller, and 9b is a lower pull-out roller. 10 is a motor.

The rollers requiring driving include an upper pressure roller 5a, a lower pressure roller 5b, an upper pull-out roller 9a,
The lower draw roller 9b. Each of these rollers has a sprocket fixed to its left and right ends. The left and right sprockets rotate by being simultaneously transmitted rotational force from the motor 10 via a chain engaged with the sprockets. The other upper film supply reel 2a, lower film supply reel 2b, upper rotation heating roller 3a, lower rotation heating roller 3b, upper guide roller 4a, and lower guide roller 4b are driven via the plastic film 1a or 1b. . In addition, the sealing process in which the plastic films 1a and 1b are pressure-adhered to the object 7 to be sealed is the same as the conventional one, so that the description is omitted.

Next, the upper guide roller 4a and the lower guide roller 4b, which are features of the present invention, will be described. FIG.
1 shows an example of the upper guide roller 4a shown in FIG. 1 alone. In this example, a large number of thin and shallow grooves D, D... It is provided. FIG. 3 is an enlarged cross-sectional view taken along line AA of FIG. In FIG. 3, 11 is a central axis,
Reference numeral 12 denotes a cylindrical portion surrounding the central axis 11, and reference numeral 13 denotes a rubber covering portion that covers the cylindrical portion 12. P, P... P are convex portions sandwiched between the grooves D, D. FIG. 4 is an exploded view showing a part of the rubber cover 13 shown in FIG. 3 cut out along a line parallel to the axis.

When the guide roller is directional and follows the running of the plastic film, when the guide roller is rotated in a direction opposite to the V-shaped acute angle direction formed by the grooves of the guide roller abutting at the center. This causes tension that spreads the film running in contact with the rollers to the right and left at right angles to the running direction. Therefore, if the same roller as the upper guide roller 4a is arranged upside down, the direction of the acute angle of the V-shape is reversed, and it can be used as the lower guide roller 4b. In addition, since a slight tension is generated in the running direction due to friction between the guide roller and the film, even if the film wound around the film supply roller has some wrinkles, the upper guide roller 4a and the lower guide roller 4b will It is completely stretched while traveling along and new wrinkles are prevented.

The guide roller shown in FIGS. 2 to 4 sandwiches a band-shaped portion having a different friction coefficient forming a V-shape at the center portion between a plurality of grooves D and between the grooves D. It is formed by a convex portion P, which is provided spirally from the center of the roller toward both ends.
Similar effects can be obtained. 5 and 6
FIG. 4 is a sectional view showing an example of such a guide roller and corresponding to FIG. 3. FIG. 7 is a development view of a cover portion of the guide roller of FIG. 5 and corresponds to FIG. 4 with respect to FIGS.
Since the development of the cover portion of the guide roller of FIG. 6 is almost the same as that of FIG. 7, the reference numerals of the corresponding portions are shown in parentheses.
In addition, regarding the V-shape of the central portion, the guide rollers in FIGS. 2 to 4 assume the case of the upper guide roller 4a, and the developed view of FIG. 7 illustrates the case of the lower guide roller 4b.

That is, the guide roller shown in FIG. 5 is a combination of two types of rubbers R and r, which are flat without irregularities on the surface of the roller and have different hardnesses. A wrinkle prevention effect can be expected by the action. The guide roller shown in FIG. 6 is formed by arranging a large number of two band-shaped portions F and f having different friction coefficients on the same rubber surface, and the difference in the friction coefficient is made by a chemical treatment of the rubber surface.

The upper guide roller 4a and the lower guide roller 4b may be exchangeable with conventional guide rollers if necessary, or may be other than the above, for example, a continuous state of a pattern diverging in the rotational direction. In addition, even if portions having different friction coefficients are formed by using unevenness, surface treatment, or different materials, there is no problem. In addition, a guide roller dedicated to wrinkle expansion (wrinkle prevention) may be provided in addition to the conventional guide roller.

[0018]

As described in detail above, the present invention provides an upper guide roller which rotates while contacting a film in the middle of a path from an upper take-up reel of a film material to an upper rotating heating roller; In the middle of the path from the lower take-up reel to the lower rotary heating roller, a lower guide roller that rotates while contacting the film is provided, and a center is formed on the surface of at least one of the upper and lower guide rollers. By arranging the guide rollers so that a band-shaped portion having a different friction coefficient is formed spirally from the portion toward both ends and the boundary line of the portion having the different friction coefficient is widened in the rotation direction, the width of the film is particularly increased. There is an effect that a tension that spreads in the direction is generated and wrinkles are spread or wrinkles are prevented. Therefore, when this embodiment is used, a product with much higher precision than the conventional technology can be obtained even in the case of sealing a wide and thin plastic film.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a main part of an embodiment of the present invention.

FIG. 2 is a perspective view showing an example of an upper guide roller of FIG.

FIG. 3 is an enlarged sectional view cut along AA of FIG. 2;

FIG. 4 is a development view in which a rubber covering portion of the guide roller of FIG. 3 is cut open.

FIG. 5 is an enlarged sectional view showing an example of another guide roller.

FIG. 6 is an enlarged sectional view of an example of another guide roller.

FIG. 7 is a development view in which a rubber covering portion of the guide roller of FIG. 5 is cut open.

FIG. 8 is an explanatory view (a right side sectional view) showing an arrangement of each roller.

[Explanation of symbols]

 1a, 1b Plastic film 2a, 2b Film take-up roller 3a, 3b Rotary heating roller 4a, 4b Guide roller 5a, 5b Pressure roller 7 Sealing object 9a, 9b Pull-out roller 10 Motor D groove P convex part

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-4-125128 (JP, A) JP-A-2-243452 (JP, A) JP-A-49-38958 (JP, A) 116952 (JP, U) (58) Fields investigated (Int. Cl. ⁶ , DB name) B29C 63/00-63/48 B32B 1/00-35/00

Claims (4)

(57) [Claims] 1. A laminator in which a film take-up roller, a guide roller, a rotary heating roller, a pressure roller, and a pull-out roller are arranged in this order, wherein the guide roller is disposed adjacent to the rotary heating roller. Bands having different friction coefficients are formed spirally from the center toward both ends on the surface, and boundaries of the band portions having different friction coefficients are provided so as to spread in the driven rotation direction , and the film is stretched in the width direction. A laminator having a function of preventing wrinkling of a sealing film, wherein the laminator is supplied to the rotating roller in a stretched state, heated and pressed against an object. 2. A portion of the guide roller having a different coefficient of friction is formed by a plurality of grooved rubber-like substance convex portions and grooves, or different in hardness arranged in parallel. 2. The sealing film according to claim 1, wherein the band-shaped portions are formed of a rubber-like material, or the band-shaped portions arranged in parallel are formed of a rubber-like material surface-treated to have different friction coefficients. Laminator. 3. An upper film take-up roller, an upper width extending roller having a belt-like portion having a different coefficient of friction spirally from the center to both ends on the surface, an upper rotary heating roller, an upper pressure roller, and an upper pull-out roller. An upper roller group arranged in this order, a lower film take-up roller, a lower width extending roller having a belt-like portion having a different friction coefficient spirally from the center toward both ends from the center, a lower rotating heating roller, In a laminator having a function of preventing wrinkling of a sealing film comprising a lower pressure roller and an upper roller group in which a lower pullout roller is arranged in this order, the direction of the film is changed to the upper width stretching roller and the lower stretching roller. The film is supplied to each of the rotary heating rollers in a state where the film is stretched in the width direction, and is heated and sealed. A laminator having a function of preventing wrinkles of a sealing film, which is characterized by being pressed against an elephant. 4. The upper and lower width extending rollers are such that portions of the rollers having different friction coefficients are formed by a plurality of grooved rubber-like material convex portions and grooves, or are arranged in parallel. Formed of rubber-like substances of different hardness,
4. The laminator according to claim 3 , wherein the band-shaped portions arranged in parallel are formed of a rubber-like substance surface-treated so as to have a different coefficient of friction.