JPH08174694A - Manufacture of synthetic resin film with fastener - Google Patents

Abstract

PURPOSE: To provide a method for manufacturing a synthetic resin film with a fastener in which the tilting deformation of an engaging pawl is effectively prevented by the orientation at the time of drawing a film after extruded from a T-shaped die and further a predetermined product finishing size can be always obtained. CONSTITUTION: The method for manufacturing a synthetic resin film with a fastener comprises the steps of uniformly setting the resin extruding speed over the entire width of a T-shaped die 11, setting the drawing speed of the synthetic resin film 2 with the fastener by a drawing roll 14 with respect to the extruding speed to a range of substantially the same speed to the speed increased by 30%, and setting the entire width size of a groove for molding the fastener and a slit for molding the film to a range of the enlarged size for estimating the resin shrinkage of the resin film with the fastener at the time of molding, the size for cancelling the size reduction of the film lateral width direction due to the acceleration and the size increase further enlarged.

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 synthetic resin film with a fastener used for a bag, a cylindrical container, a binding of wires, cords and the like, a protector and the like.

[0002]

2. Description of the Related Art Not only is a cylindrical container made of synthetic resin with a fastener as shown in FIG. 9 used for binding wires, cords, etc., and for protective equipment, JP-B-42-16925 and JP-B-5.
As disclosed in No. 8-43577, occlusal nail type fasteners are formed on both ends of a synthetic resin film.

[0003]

Even when the occlusal nail type fasteners are provided at the same both ends, when the occlusal nails are provided in the horizontal direction with respect to the film surface as in the conventional example, Although there is no particular problem in terms of manufacturing, grooves 5a and 5b for forming occlusal nail type fasteners standing perpendicular to the film surface as shown in FIGS. 3, 5 and 7 and slits 4 for film forming are provided. Synthetic resin film 2 with T-shaped die (die slit surface) 1 with bite claws 3a, 3b
In the case of extrusion molding, when it was actually molded, the shape results shown in FIGS. 4, 6 and 8 were brought about, and it was difficult to mold into a shape similar to the die slit shape.

That is, T type die (die slit surface) 1
When the synthetic resin film 2 with the occlusal claws 3a and 3b extruded from is drawn through the cooling process, the synthetic resin film 2 is stretched along with the drawing, and the synthetic resin film 2 moves in the traveling direction. As a result of being pulled, the occlusal claws 3a and 3b are tilted or the claw shape is collapsed to make it impossible to occlude. In the case of a type using a slider as shown in FIGS. As shown in FIGS. 4 and 6, the fitting neck portion 6 extends and is flattened, which makes it impossible to mount the slider.

As a measure for preventing the tilting deformation of the bite claws 3a, 3b, the bite claws 3a, 3b are extruded in advance by tilting them in the direction opposite to the tilting deformation direction due to the stretching of the synthetic resin film 2. A method of returning the synthetic resin film 2 to a normal posture by stretching it back may be considered, but the resin and molding conditions may be set in advance in the direction opposite to the tilting deformation direction of the synthetic resin film 2 due to stretching. It is difficult to put into practical use because it varies depending on

In order to avoid such a problem due to stretching of the synthetic resin film 2, as shown in FIG. 10, the film portion 15a having the required width and the fasteners 15b and 15c are separately molded to form the film portion 15a. Fasteners 15b and 15c at both ends in the width direction, and fasteners 15b and 15c
Although a method of thermally adhering or adhering with an adhesive by the adhesion margin 15d formed in the above is adopted, the cost is increased due to the molding man-hours and the adhering man-hours, and the appearance is damaged due to the adhesion between the film portion 15a and the fasteners 15b and 15c. ing.

In view of the above-mentioned conventional problems, an object of the present invention is to reliably prevent tilting deformation of the occlusal pawl due to stretching at the time of taking out the synthetic resin film after being extruded from the T-type die, and to always keep a predetermined value. The present invention provides a method for manufacturing a synthetic resin film with a fastener, which secures the finished dimension of the product.

[0008]

SUMMARY OF THE INVENTION To achieve the above object, the present invention provides an occlusal nail type fastener forming groove at both ends and a film forming slit between the both ends of the fastener forming groove. When the synthetic resin film with a fastener extruded from the die slit of the T-shaped die that it has is taken by a take-up roll via a cooling step,
This take-up speed is taken within a range of approximately the same speed to 30% acceleration as compared with the extrusion speed of the fastener-attached synthetic resin film extruded from the T-type die, while the fastener-forming groove and film-forming are used. Set the full width dimension with the slit in the range of the expanded dimension that allows for the resin shrinkage of the synthetic resin film with the fastener at the time of molding or the expanded dimension that cancels the size reduction in the film width direction due to the acceleration rate. It is characterized by doing so.

[0009]

With the above method, extrusion is performed from the T-die with an enlarged dimension that allows for resin shrinkage during molding, or with an enlarged dimension that compensates for the dimension reduction in the film width direction due to the increase in the take-up speed of the film. In the former case, the molded synthetic resin film with a fastener is taken through the cooling step at about the same speed as the extrusion speed of the synthetic resin film with a fastener that is extruded from the T-die, and therefore the above problems associated with stretching Cooling is stabilized at a predetermined product finish size without causing a reduction in size in the dot or film width direction.

In the latter case, the film is drawn through the cooling process at a speed within 30% of the extrusion speed of the fastener-attached synthetic resin film extruded from the T-die, whereby the film is stretched. Although the dimension decreases in the width direction, the total width of the T-die die slit for the fastener forming groove and the film forming slit is. The stretched film is increased in size to offset the size reduction, so that the stretched film is cooled and stabilized at a predetermined finished product size.

[0011]

Embodiments of the present invention will be described below with reference to the drawings. In FIG. 1, 10 is an extruder and 11 is a T-die. T type die (die slit surface) 1 of this T type die 11
For extruding a synthetic resin film 2 with a fastener in which occlusal nail type fasteners 3a and 3b are integrally formed at both ends of a film portion 2a as shown in FIG.
Grooves 5a, 5 for forming a fastener as shown in FIGS.
b and a slit 4 for film formation between the grooves for fastener formation at both ends.

The resin passage in the T-die 11 is provided with a resin extrusion speed control means for making the resin extrusion speed uniform over the entire width of the fastener molding groove and the film molding slit, and The overall width dimension of the fastener molding groove and the film molding slit is set to an enlarged dimension that allows for the shrinkage of the resin after extrusion of the fastener and the film.

Alternatively, the total width dimension of the groove for forming the fastener and the slit for forming the film is T-shaped die 11
The size is further increased to compensate for the size reduction in the film width direction due to the film stretching when the take-up speed by the take-up roll 14 is increased with respect to the extrusion speed of the fastener-attached synthetic resin film extruded from.

As shown in FIGS. 11 and 12, the resin extrusion rate control means for making the resin extrusion rate uniform over the entire width of the fastener molding groove and the film molding slit is directly connected to the resin inflow port 20. A first passage 21 having a maximum volume which is in communication with the second passage 22 having a volume smaller than that of the first passage 21 from the first passage 21 toward the slit 24;
Further, the second passage 22 is composed of a third passage 23 having a smaller volume than that of the second passage 22, and the first passage 21 and the second passage 22 have a first passage.
The weir 22a and the second passage 22 and the third passage 23 are partitioned by the second weir 23a, respectively. As shown in FIG. 11, the first weir 22a and the second weir 23a are steep mountain-shaped curves with the central apex directed toward the resin inlet 20, and both sides of the first passage 21 are dotted lines in FIG. As shown in, the third passage 23 extends to a part thereof, both sides of the second passage 22 overlap a part of both sides of the first passage 21 and the third passage 23, and extend to the vicinity of the slit 24. are doing.

With the resin extrusion speed control means having such a structure, the resin extrusion speed flowing from the central resin inflow port 20 can be suppressed by the contact resistance at the apex portions of the first weir 22a and the second weir 23a. Acceleration is induced in the left-right direction (width direction) along the steeply sloping mountain curve, and as a result,
The extrusion rate of the resin extruded from the slit 24 is controlled uniformly over the entire width.

The T-die 11 having such a structure is attached to the extruder 10 so that the slit 24 faces downward.
A cooling water tank 12 is installed just below the die 11, and an air gap AG is formed between the water surface WL and the slit 24. A plurality of guide rolls 13 are arranged in the cooling water tank 12, and the synthetic resin film 12 with a fastener extruded from the T-shaped die 11 is guided in water and taken out of the cooling water tank 12.

A take-up roll 14 is arranged outside the cooling water tank 12 at a portion where the fastener-attached synthetic resin film 2 is taken out. The rotation speed of the take-up roll 14 is adjusted and set so as to take in the synthetic resin film 2 with the fastener within a range of approximately the same speed as the resin extrusion speed extruded from the T-die 11 to 30%. ing. The adjustment setting of the rotation speed of the take-up roll 14 is, for example, DC.
It is possible to set a predetermined rotation speed by controlling the rotation speed of the motor or the inverter motor.

Therefore, the synthetic resin film 2 with a fastener, which is extruded from the T-die 11 at a uniform resin extrusion speed over the entire width of the slit 24 with an enlarged dimension that allows for the amount of resin shrinkage at the time of molding, is inside the cooling water tank 12. Entry guide roll 1
3 is taken out of the cooling water tank 12 and is taken out at substantially the same speed as the resin extrusion speed of being extruded from the T-shaped die 11 by the take-up roll 14, so that the synthetic resin film 2 with the fastener is moved in the traveling direction (flow direction). Direction), and there is no stretching action, so the dimension reduction in the film width direction is within the preset range of resin shrinkage at the time of molding, thus stabilizing cooling with a predetermined product finish dimension. To do.

When the synthetic resin film 2 with the fastener is taken by the take-up roll 14, the synthetic resin film with the fastener extruded from the T-die 11 is pulled at about the same speed as the extrusion speed. As a general rule, the same speed is preferable, but there is no problem as a product even if it is slightly changed up and down, and it is possible to adjust the product dimensions slightly by adjusting it slightly.

Further, the synthetic resin film with a fastener 2 extruded from the T-shaped die 11 is taken up by the take-up roll 14 at a speed within 30% of the resin extrusion speed extruded from the T-shaped die 11. This is because it has been found that the productivity can be improved by this, and further, if it is within the above range, unfavorable problems do not occur in the fasteners 3a, 3b even by this stretching action.

However, when the take-up speed by the take-up roll 14 is made faster than the extruding speed of the fastener-attached synthetic resin film 2 extruded from the T-type die 11, the dimension decreases in the film width direction, so that the T-type The overall width dimensions of the fastener forming grooves 5a and 5b of the die slit of the die 11 and the film forming slit 4 are increased so as to offset the size reduction.

As a result, the problems associated with the stretching action of the synthetic resin film 2 with a fastener are eliminated, and the occlusal nails 3a, 3
A synthetic resin film 2 with a fastener is obtained which prevents tilting deformation of b and retains the shape of the slider fitting neck 6, and provides a cylindrical container 30 made of a synthetic resin with a fastener as shown in FIG. be able to. In addition to this, it can be used not only for a bag body with a fastener but also for binding wires, cords and the like, a protector and the like.

[0023]

As described above, according to the present invention, a synthetic resin film with a fastener extruded from a T-type die is increased by about 30% to about 30% with respect to the extrusion rate extruded from the T-type die. Try to pick up in the range, while T
The overall width of the die-forming fastener groove and film-forming slit is a dimension that allows for resin shrinkage during molding, or a further increased dimension that offsets the dimension reduction in the film width direction due to the acceleration rate. Since it is designed to be set within the range, the extruded synthetic resin film with a fastener is surely prevented from the adverse effect that the occlusal claw is tilted and deformed due to the stretching action at the time of take-up, and the predetermined product finish is always maintained. It is possible to provide a synthetic resin film with a fastener that secures dimensions and maintains a good occlusal aspect of the fastener.

[Brief description of drawings]

FIG. 1 is a side view showing the method of the present invention.

FIG. 2 is an end view of a synthetic resin film with a fastener manufactured by the method of the present invention.

FIG. 3 is a front view of an example of a die slit surface of a T-die used in the method of the present invention.

4 is an end view of a defective example of a synthetic resin film with a fastener manufactured by the T-die shown in FIG.

FIG. 5 is a front view of another embodiment of the die slit surface of the T-die used in the method of the present invention.

6 is an end view of a defective synthetic resin film with a fastener manufactured by the T-die shown in FIG.

FIG. 7 is a front view of another embodiment of the die slit surface of the T-die used in the method of the present invention.

8 is an end view of a defective example of a synthetic resin film with a fastener produced by the T-die shown in FIG.

FIG. 9 is a perspective view of a main part of a cylindrical container showing an example of an article to which the method of the present invention is applied.

FIG. 10 is an end view of a synthetic resin film with a fastener having a conventional fastener bonding structure.

FIG. 11 is a diagram showing the internal structure of a T-die used in the method of the present invention.

12 is a sectional view taken along line AA of FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 T-type die (mold slit surface) 2 Synthetic resin film with fastener 4 Slit for film forming 5a Fastener forming groove 5b Fastener forming groove 6 Slider fitting neck 11 T-type die 12 Cooling water tank 13 Guide roll 14 Collection roll

Claims (1)

[Claims] 1. A fastener extruded from a die slit of a T-type die having occlusal nail-shaped fastener-forming grooves at both ends and a film-forming slit between the both ends of the fastener-forming groove. When the synthetic resin film is taken by the take-up roll via the cooling step,
This take-up speed is taken within a range of approximately the same speed to 30% acceleration as compared with the extrusion speed of the fastener-attached synthetic resin film extruded from the T-type die, while the fastener-forming groove and film-forming are used. Set the full width dimension with the slit in the range of the expanded dimension that allows for the resin shrinkage of the synthetic resin film with the fastener at the time of molding or the expanded dimension that cancels the size reduction in the film width direction due to the acceleration rate. A method of manufacturing a synthetic resin film with a fastener characterized by the above.