JPS63104827A - Production unit for interior bag for vessel can - Google Patents

Abstract

(57) [Abstract] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an apparatus for manufacturing inner bags for containers and cans.

[Conventional technology and its problems]

When filling materials such as fluids and powders into containers such as drum cans, bale cans, and cans, it is necessary to prevent the inner surface of the can from being contaminated with secondary filling materials, or to prevent the inside of the can from becoming contaminated due to the physical properties of the filling material. To prevent corrosion, an inner bag made of chemical-resistant synthetic resin is inserted inside the can. By inserting and loading the inner bag into the can and filling the bag with the filling, the filling will not come into direct contact with the inside of the can, so the inside of the can will not be contaminated with the filling material, and the can can be reused. This has the advantage that it can be done easily and inexpensively without the hassle of cleaning.

Furthermore, even if the filling material is acidic or has corrosive properties, the can can be protected because the filling material does not come into direct contact with the inner surface of the can.

However, these inner bags have traditionally been made one by one by hand. In this method, a petri dish-shaped bottom member is preformed by vacuum forming using a polyethylene sheet to match the inner diameter and shape of the inner bottom of the drum can, bale can, etc. in which the inner bag is used. Then, it is manufactured using the second bottom member and a fixed-size tube that is cut to match the length of the can from a resin tube made in advance from synthetic resin such as polyethylene to match the inner diameter of the can.

This is done either by fitting one end of the tube externally onto the outer circumferential surface of the peripheral edge piece of the bottom member, or by fitting one end of the tube internally into the inner circumferential surface of the peripheral edge piece of the bottom member, and then by fitting the end of the tube internally into the inner circumferential surface of the peripheral edge piece of the bottom member, and then forming the overlapping portion between the end of the tube and the peripheral edge piece of the bottom member. Repeat this for a certain length and weld it together using a heat sealer. This tube and bottom member are made of resin sheets and tubes that have a certain thickness so as to have the desired strength as an inner bag, so it takes a certain amount of time to completely weld the two parts together. It is necessary to perform welding. For this reason, the entire process cannot be automated and is handmade, which takes time, and there is a limit to the number of products that can be produced per day and by one worker.
This increases the cost of the product.

In addition, the daily production volume changes depending on the skill level, intuition, and mental and physical fatigue of the workers, and defective products such as poor welding occur, making it difficult to produce uniform products. When cutting, the presence or absence of pinholes in the Chikop wood is visually inspected, that is, with the naked eye.
Workability is poor when cutting the tube, and accuracy is poor when inspecting pinholes.

In addition, double and triple inner bags are used for hazardous materials storage and other substances where leakage is not allowed, but it takes time to fit the inner and outer bags of the same size together, creating an air layer between the inner and outer bags. However, there is a disadvantage that the wall thickness of the bag becomes bulky.

[Means for solving problems]

A forming winding drum supported in a cantilever manner on a main body frame on which a roll film is placed and whose drum diameter can be changed; a feed roller disposed opposite to a presser roller for sending out the film; An arc-shaped rotating heater that can be moved up and down on the take-up drum and welds the film wound around the drum to the outer periphery of the bottom member, a vertical heater that welds the film in the vertical direction, and a heater that moves up and down the heater. The device is provided with means and a drive device for driving the drum and the feed roller intermittently, and the raising and lowering operation of the heater is synchronized with the intermittent driving of the drum and the feed roller.

Then, a bottom member is mounted on a drum whose diameter can be changed, and this drum is driven intermittently at a constant pitch in synchronization with the feed amount of the film, and as the film is wound around the outer circumference of the drum, the end of the film and the bottom member are moved at a constant pitch. To automatically manufacture an inner bag in which a circumferential wall is formed by tightly winding a plurality of layers of film by welding the film between the film and the film wound around the outer periphery of the drum, and by sequentially turning the films loosely.

〔Example〕

The present invention will be described below based on embodiments shown in the drawings.

F is the main body frame of the device for manufacturing inner bags that are used by being fitted inside containers such as drum cans and bale cans, and a roll film having a required width and a long film f wound around the upper part of this frame F. The film f is arranged so as to be rotatable and detachable, and the film f is sequentially fed out from the roll film R, and the guide roller Gl is moved toward the forming and winding drum 10 provided on the opposite side of the roll film R.
, feed roller 2, guide roller G2. Let it guide you through G3.

The feed roller 2 is rotatably supported by a bearing l provided on the main body frame F, and a presser roller 3 supported by a bearing 1 is disposed above the feed roller 2. Adjust the pressing force with adjustment handle 5 for 1! 1
II- The film f is supported to be slidable in the vertical direction by a sliding bearing 4, so that the film f fed out from the roll film R passes through a guide roller G1, and then passes through a presser roller 3 and a feed roller arranged vertically opposite each other. The film is guided between rollers 2, and when the feed roller 2 is driven intermittently in response to film feeding, it is fed out while being held between upper and lower rollers 3.2.

The feed roller 2 is driven by a motor M provided on the main body frame F, which drives a reducer 28 supported by the main body frame with a bearing 20 via a chino (or belt) C1. A crank rod 23 is attached to the provided crank 22 via a pivot 23b, the tip of the crank rod 23 is pivotally supported via a pivot 23a to a sector gear 24, and the sector gear 24 is connected via a shaft 26 and a bearing 25. This is carried out by supporting the main body frame F so that it can swing freely, and by meshing the teeth of this fan-shaped gear 24 with a gear 27 fixed to the shaft end of the feed roller 2.

This gear 27 has a built-in one-way clutch, and the crank 22
The rotational motion is converted into linear motion by the crank rod 23 and transmitted to the fan gear, and the feed roller 2 is intermittently driven in one direction by a one-way clutch built into the gear.

In this way, the film f that is intermittently fed out at a constant pitch is transferred from the feed roller 2 to the guide roller G2. G3 and then wound around the outer periphery of the forming and winding drum 1G, and this forming and winding drum 10 is supported by the main body frame F in a cantilever manner via a bearing 11.

The drum 10 is driven by fixing a gear 12 to a part of a cantilevered drum shaft, meshing the gear 12 with a gear 13 supported on the body frame F via a bearing 14, and coaxially driving the drum 10. A sprocket wheel (not shown) fixed to the chain C2 and a sprocket wheel (not shown) provided coaxially with the reducer 28 or the feed roller 2 are connected to the chain C2.
The feed roller 2 and the forming take-up drum 10 are connected to each other so that the circumferential speeds of the feed roller 2 and the forming and winding drum 10 are made equal to each other so that they are driven intermittently.

Note that in the illustrated embodiment, the feed roller 2 and the forming take-up drum 10 are driven by a single motor.
Two motors: one for the feed roller and one for the forming take-up drum.
It is also possible to use a stand and electrically control and drive the respective peripheral speeds so that they are equal.

Moreover, a heater device is provided above the forming and winding drum 10 for welding a desired position of the film f to be wound around the outer periphery of the drum. H is provided so that it can be raised and lowered freely.

This heater device 1H has a guide frame 6 protruding from the main body frame F to support an elevating heat frame 7 so as to be able to rise and fall freely, and one end of this frame 6 is formed into an arc shape along the outer periphery of the forming and winding drum. A rotating heater 8 for welding the edges of the film to be processed and a vertical heater 9 for longitudinal welding along the longitudinal direction of the forming and winding drum are provided. The end of the frame is supported by a guide frame 6 so as to be able to move up and down.

A link 15 is provided on a part of the elevating heater frame supported by the guide frame via a pivot 15a, and the other end of the link 15 is pivotally connected to one end of a bell crank 16 via a pivot 15b.

The bell crank 16 is swingably supported by the main body frame F via a bearing 1, and a pivot 1 is attached to the other end of the bell crank.
A rod 18 is pivotally connected via a shaft 8b, and the tip of the rod 18 is pivotally connected to an eccentric cam 19 via a pivot 18b. The eccentric cam 19 is fixed to the reducer 28 coaxially with the crank 22.

Although the elevating and lowering movement of the elevating heater frame 7 is performed using a link mechanism in the above embodiment, it is also possible to use a cylinder to perform the elevating and lowering movement in synchronization with the intermittent rotation of the forming and winding drum.

Further, the forming and winding drum 10 has a structure in which the diameter of the drum is reduced so that the inner bag can be easily removed from the drum after the film is wound around the outer periphery of the film several times and is welded to the bottom member to form an inner bag. For example, as shown in FIGS. 2 and 3, the drum 10 is divided into three parts in the longitudinal direction, and each drum piece 10a, 10b, 10 in brackets is formed.
The cut surface of c is inclined, and a slide rail is provided between each of the drum pieces so that the drum pieces are integral with each other in the circumferential direction but are slidable in the longitudinal direction. This forms a drum having a desired diameter when each drum piece is in place, but the outer drum pieces 10a,
10c is fixed to the drum shaft at the center of the drum piece 10b.
When the drum pieces are slid against each other, the drum pieces move along the inclined surfaces that make them contact each other. As a result, the drum pieces 10a and 10c on both sides of the central drum piece 10b
As the inner bag is pulled out, the diameter of the drum at the central drum piece position becomes substantially smaller, and the inner bag thus formed can be easily pulled out to the open end side of the drum.

The production of an inner bag using the production apparatus configured as described above will be explained.

First, a resin sheet having the desired strength and 61 chemical properties as an inner bag, such as a polyethylene sheet, a vinyl chloride sheet, etc., is used as a bottom member according to the shape and size of the inner bottom of the drum can, bale can, or other container can in which the inner bag will be used. Form P1 by vacuum forming or the like. This bottom member P1
is shaped like a petri dish, and has a bottom piece pH and a peripheral piece P12 connected to the outer periphery of the bottom piece in a short cylindrical shape.

The forming and winding drum 10 also has a diameter corresponding to the inner diameter of the container can and is fixed to the drum shaft. And this drum 10
The bottom member P1 is placed on the open end side of the bottom member P1.

Next, the peripheral wall portion of the inner bag is formed by rotating a drum 10 and tightly winding a continuous long resin sheet around the outer circumference of the drum a plurality of times. This resin sheet is made of a synthetic resin that can be easily welded to the bottom member, such as polyethylene or vinyl chloride, similar to the material of the bottom member, and the thickness of the sheet is adjusted to the desired thickness by winding it multiple times. shall be determined appropriately.

Note that the width of the resin sheet 2 is predetermined to be the length of the inner bag forming the resin sheet 2.

゛When winding the resin sheet P2 around the outer periphery of this drum, the drum 10 rotates to wrap the resin sheet P2 around the bottom so that one side edge P21 of the resin sheet P2 overlaps the surface of the peripheral edge piece P12 of the bottom member P1. Wrap it around the surface of the peripheral piece of material and the outer surface of the drum. While winding this resin sheet, the resin sheet edge portion and the peripheral edge piece of the bottom member are welded and integrated. At this time, the welding should be performed reliably to prevent the filling from leaking. This welding is done after the drum has rotated by a predetermined angle.
That is, after only one pitch of intermittent motion is driven, the rotation of the drum is stopped and the elevating heat frame is lowered,
Welding is performed using a rotating heater and a vertical heater.

Repeat this step by step.

In this way, one end of the resin sheet is welded to the outer periphery of the peripheral edge piece of the bottom member, and the resin sheet is tightly wound several times to provide the desired strength as the wall between the bags. They should be in close contact with each other so that there are no air spaces. Furthermore, when the resin sheet is wound around the outer periphery of the drum, a very fine continuous gap is formed between the inner and outer sheets in a spiral shape at the wall between the bags. In this state, if any of the inner sheets is damaged or there is a pin pole, the contents inside the bag will leak from this damage or the bottle ball part, and will pass through the extremely narrow spiral gap between the inner and outer resin sheets and go inside the outermost sheet. reach up to.

To prevent this, this spiral gap is partitioned into a plurality of block chambers, just like a rubber boat.

This is because when the resin sheet is tightly wound, when the resin sheet is wound at a certain angle, the inner and outer resin sheets being wound are formed vertically in the direction along the longitudinal axis of the forming drum, that is, in the longitudinal direction of the bag. Weld in the direction using a vertical heater. This is done at the same time when the resin sheet is tightly wound, and the longitudinal welding 6 is performed at least once, preferably 3 or several times, while the resin sheet is wound once.

After forming the peripheral wall by winding the resin sheet while welding it around the outer periphery of the bottom member in this way, if necessary, weld the opening end of the bag and remove the inner bag by reducing the drum diameter. .

〔Effect of the invention〕

According to the present invention, a drum whose diameter can be changed is covered with a bottom member, and this drum is driven intermittently at a constant pitch in synchronization with the feed amount of the film, and as the film is wound around the outer periphery of the drum, the film is rolled at a constant pitch at a time. It is possible to automatically manufacture an inner bag in which the peripheral wall is formed by welding the edges and the bottom member and between the films wound around the outer periphery of the drum, repeating this process in sequence, and tightly winding several layers of film. Moreover, it has the advantage of being able to manufacture pinhole-free and highly accurate bags at low cost.

[Brief explanation of the drawing]

Figure 1 is a front view, Figure 2 is a side view of the forming winding drum section,
FIG. 3 is an explanatory diagram showing a change in the diameter of the drum shown in FIG. 2. R is a roll film, F is a main body frame, H is a heater device, M is a motor, f is a film, 2 is a feed roller, 3 is a press roller, 7 is an elevating heat frame, 8 is an orbiting heater, 9 is a second vertical heater Figure 3

Claims (1)

[Claims] A forming winding drum supported in a cantilever manner on a main body frame on which a roll film is placed and whose drum diameter can be changed; a feed roller disposed opposite to a presser roller for sending out the film; An arc-shaped rotating heater that can be moved up and down on the take-up drum and welds the film wound around the drum to the outer periphery of the bottom member, a vertical heater that welds the film in the vertical direction, and a heater that moves up and down the heater. Manufacture of an inner bag for containers and cans, characterized by comprising means and a drive device for intermittently driving the drum and the feed roller, and synchronizing the raising and lowering operation of the heater with the intermittent driving of the drum and the feed roller. Device.