JPH05228994A - Sizing basket for inflation - Google Patents

Abstract

PURPOSE:To reduce runout of bubble in an inflation film and prevent generation of defect like trace of a roll on the face of the film. CONSTITUTION:An axis core 14 is placed rectangularly with respect to the radial direction. A plurality of continuous guide rolls 1 arranged radially on the same horizontal face, a plurality of arms 3 having the guide rolls 1 at their tips and reciprocating in the radial direction, and a plurality of reciprocation means 43, 45, and 48 for reciprocating the arms 3 in the radial direction are provided.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an inflation sizing basket for preventing the fluctuation of bubbles in an inflation film extruded from an extrusion die to prevent the variation of the folding diameter of the inflation film.

[0002]

2. Description of the Related Art Bubbles of an inflation film extruded from an extrusion die are swelled to a thin wall at a high temperature, so that they are easily shaken by external conditions and the like, which has been a major factor of fluctuation in folding diameter.

For this reason, various bubble stabilizing devices have been proposed. For example, as shown in FIGS.
A roll that guides the bubble is rotated according to the diameter of the bubble to prevent the bubble from swinging by a cantilever method, or as shown in FIG.
A method has been proposed in which a large number of (Φ15 to 20 mm, L15 to 20 mm) are passed through one rod 21 and moved according to the diameter of the bubble to prevent the bubble from swinging.

In the former method, as shown in FIG. 4, each of a plurality of support shafts 22 (in this case, four in one stage and eight in two stages) provided at equal angles α in the radial direction is rolled. 23
Is mounted in a cantilever system. The roll 23 is V
It is rotatable about a support shaft 22 in the direction of the arrow.

When the bubble 11 has a small diameter (for example, Φ900 mm), the roll 23 has a large rotation angle and the bubble 12 has a large diameter (for example, Φ1) as shown in FIG.
In the case of about 600 mm), as shown in FIG. 6, the rotation angle is made small so that the bubbles 11 and 12 are brought into contact with each other to prevent the bubbles 11 and 12 from swinging.

As the roll 23, a plurality of rolls having different lengths are exchanged for use depending on the diameter of the bubble.

[0007]

By the way, FIG. 4 to FIG.
In the method shown in (1), the strength is weak due to the cantilever method, and when the length of the roll 23 becomes long, the roll 23 is bent. Further, since the roll 23 is rotated around the support shaft 22 as a fulcrum, it is difficult to accurately set the rotation angle. Therefore, there is a problem that the bubble cannot be accurately guided.

Further, in the method as shown in FIG. 7, since a large number of small diameter and short length rolls 20 passed through one rod 21 have different rotational resistances, when the rolls 20 are brought into contact with the bubbles, The running resistance was different between the rolls 20 and 20, so that the bubbles were marked with rolls and defective products were generated. Further, dust, dust, etc. are likely to adhere between the rolls 20, 20, and dust, dust, etc. collected between the rolls 20, 20 may adhere to the surface of the bubble to damage the bubble, resulting in a defective product. there were.

In view of the above points, the present invention can reduce the fluctuation of bubbles in an inflation film,
Another object of the present invention is to provide an inflation sizing basket that does not cause defects such as roll marks on the film surface.

[0010]

An inflation sizing basket according to the present invention comprises a plurality of long guide rolls whose axes are positioned at right angles to the radial direction and which are radially arranged on the same horizontal plane. A plurality of arms attached to the tip of the guide roll and reciprocally movable in the radial direction, and reciprocating means for reciprocating the plurality of arms in the radial direction are provided.

It is desirable that the plurality of long guide rolls radially arranged on the same horizontal plane be provided in a plurality of upper and lower stages in order to stabilize bubbles. It is desirable that the surface of the guide roll is subjected to surface treatment such as baking of Teflon or a silicone rubber layer so that dust and dirt do not adhere to the surface.

[0012]

A plurality of arms, each having an axial center located at a right angle to the radial direction and having a plurality of long guide rolls radially arranged on the same horizontal plane attached to the ends, are linearly linear in the radial direction. As it is reciprocated, multiple elongate guide rolls are positioned at precise locations with respect to the bubbles. Accurate positioning of the plurality of elongate guide rolls allows the bubbles to be accurately guided and reduces bubble runout.

The long guide roll eliminates the difference in rotational resistance between the rolls which occurs when a short roll is used, and eliminates defects in the inflation film due to this. Further, since there is no gap between the rolls, dust, dust, etc. do not adhere to the gap between the rolls, and defects such as roll marks on the film surface are eliminated.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the drawings. Figure 1
FIG. 4 is a plan view of an embodiment of the inflation sizing basket of the present invention.

Reference numeral 1 denotes a long guide roll whose axial center 14 is positioned at right angles to the radial direction and which is radially arranged on the same horizontal plane at an equal angle θ. In this example, the guide roller 1 is on the same horizontal plane. Three guide rolls 1 are radially arranged at an equal angle θ.

Reference numeral 2 denotes a long guide roll which is arranged on the same horizontal plane different from the guide roll 1 (in the present embodiment, at the bottom) in the same manner as the guide roll 1, and the three guide rolls 2 are the guide rolls 1. It is arranged so that it may be located in the center of 1 between.

A plurality of such long guide rolls 1,
2 can be provided in a plurality of upper and lower stages. Although not shown in this example, the guide roll 1 has three stages and the guide roll 2 has four stages, and the upper and lower guide rolls are provided so as to overlap each other when viewed from above.

Reference numerals 3 and 4 are arms for reciprocating the guide rolls 1 and 2 in the radial direction (X and Y arrow directions). With this, the guide rolls 1 and 2 can reciprocate linearly in the radial direction.

The arms 3 and 4 are rod-shaped, and guide roll supporting members 5 and 6 to which the guide rolls 1 and 2 are attached are attached to the respective tips. Round racks 7 and 8 are provided on the arms 3 and 4 so as to be able to mesh with gears, and the arms 3 and 4 are slidable by being inserted into slide bearings 9 and 10.

Reference numeral 11 is a small-diameter bubble guided by the guide rolls 1 and 2 in the solid line position. Reference numeral 12 is a large-diameter bubble that can be guided when the guide rolls 1 and 2 are retracted to the position of the imaginary line.

Reference numerals 41, 42 and 43 are sprockets,
44 and 45 are chains, 46 is a tensioning tool for tensioning the chain 45, 47 is a prime mover, and 48 is a feed gear.

Next, the reciprocating means for reciprocating the plurality of arms 3 and 4 in the radial direction will be described. FIG. 2 is an illustration of this reciprocating means. The slide bearings 9 and 10 and the bearing 50 are fixed to a frame 60. Although not shown, the prime mover 47 is also fixed to the mount 60.

The rotating shaft 51 is supported by bearings 50 and 50, and sprockets 42 and 43 are attached to one ends thereof, and a feed which meshes with the round racks 7 and 8 provided on the arms 3 and 4 between the bearings 50 and 50. A gear 48 is attached.

The chain 45 is stretched in a loop shape from the sprocket 43 to the sprocket 43 via a tensioning tool 46 on the way. The reciprocating means includes round racks 7 and 8, a feed gear 48, a sprocket 43, a chain 45,
The rotary shafts 51 and 52 are provided.

When the motor 47 is rotated, the sprocket 4
1, the chain 44, the sprocket 42 through the rotary shaft 5
The rotational force is transmitted to 1, and the feed gear 48 rotates. The forward and backward rotation of the feed gear 48 causes the round rack 7 meshing with the feed gear 48 to reciprocate in the X arrow direction. Therefore, the arm 3 provided with the round rack 7 is reciprocated in the X arrow direction. Accordingly, the guide roll 1 attached to the tip of the arm 3 is linearly reciprocated in the X arrow direction.

The rotation of the prime mover 47 is controlled by the sprocket 43.
A chain 45 stretched in a loop through the gears is transmitted to rotate the other sprocket 43 in the same direction.
As a result, the rotary shaft 52 is rotated in the same direction as the rotary shaft 51. And like the case of the rotary shaft 51, the positive of the rotary shaft 52,
By the reverse rotation, the arm 4 provided with the round rack 8 reciprocates in the Y arrow direction, and the guide roll 2 attached to the tip of the arm 4 reciprocates in the Y arrow direction.

Therefore, by rotating the motor 47 forward and backward to linearly reciprocate the guide roll 1 and the guide roll 2 in the radial direction, the guide rolls 1 and 2 are brought to appropriate positions and the bubble 11 is accurately guided. can do.

When changing the diameter of the bubble, the positions of the guide rolls 1 and 2 are appropriately adjusted by reciprocating the arms 3 and 4. For setting the positions of the guide rolls 1 and 2, the guide rolls 1 and 2 may be manually reciprocated by manual setting, or a position sensor may be attached at an appropriate position to automatically reciprocate by automatic setting. ..

Further, by incorporating a driving device in the guide roll, the guide roll can be rotated at an arbitrary speed, and the surface speed of the guide roll can be set according to the traveling speed of the inflation film. The running resistance of the film can be further reduced.

FIG. 3 is an explanatory view showing the mounting position of the inflation sizing basket of the present invention. The inflation film 83 extruded from the extrusion die 80 is inflated in a bubble shape to form bubbles 87, which are then folded by a take-up roll 85 through a folding roll 84 and then wound by a winder 86.

A sizing basket 100 in which a plurality of inflation sizing baskets of the present invention are combined is
It is desirable to install the lowermost guide roll on the frost line 82 as close to the frost line 82 as possible, for example, at a position about 10 cm above the frost line 82 in order to prevent the shake of the bubbles.

Further, the air chamber 81 and the like are set to the extrusion die 80.
When provided above, it is desirable to mount the above sizing basket 100 on the air chamber 81.

[0033]

EFFECTS OF THE INVENTION A plurality of long guide rolls, each having an axis centered at right angles to the radial direction and radially arranged on the same horizontal plane, are attached to the distal ends of a plurality of arms, which are straight in the radial direction. Since it can be reciprocally moved, the long guide roll can be positioned at a required accurate position.

Bubbles are accurately guided by the guide rolls and the vibration of the bubbles is reduced. This makes it possible to prevent the folding diameter of the blown film from fluctuating.

By using a long guide roll, the difference in rotational resistance between rolls, which occurs when a short roll is used, is eliminated, so that the defect of the inflation film due to this can be eliminated, and the roll gap can be eliminated. Since there is no gap between the rolls, it is possible to eliminate defects such as roll marks on the film surface due to dust and dust adhering to the gap between the rolls.

[Brief description of drawings]

FIG. 1 is a plan view of an embodiment of an inflation sizing basket of the present invention.

FIG. 2 is an explanatory view of the reciprocating means of FIG.

FIG. 3 is an explanatory view showing a mounting position of the inflation sizing basket of the present invention.

FIG. 4 is an explanatory diagram of an example of a conventional inflation sizing device.

5 is an explanatory diagram of an example in which the device of FIG. 4 is used for a small-diameter bubble.

6 is an explanatory view of an example in which the device of FIG. 4 is used for a large-diameter bubble.

FIG. 7 is an explanatory view showing a main part of another example of a conventional inflation sizing device.

[Explanation of symbols]

 1, 2 Guide roll 3, 4 Arms 5, 6 Guide roll support 7, 8 Round rack 9, 10 Slide bearing 11, 12 Bubble 14, 15 Shaft center 41, 42, 43 Sprocket 44, 45 Chain 46 Tensioner 47 Motor 48 feed gears 51, 52 rotating shafts

Claims (1)

[Claims] 1. A plurality of long guide rolls whose axial centers are positioned at right angles to the radial direction and which are radially arranged on the same horizontal plane, and the guide rolls are attached to the distal ends of the guide rolls. An sizing basket for inflation, comprising: a plurality of reciprocating arms and a reciprocating means for reciprocating the plurality of arms in a radial direction.