JPH0467942A - Bag manufacturing device and bag manufacturing method - Google Patents

Abstract

PURPOSE:To prevent an adhesive from adhering to a belt and make the flow smooth by feeding a polyethylene bag and a sheet overlapped together in the given direction by means of a raw material feeding belt and injection coating the edges of sheet with a water-soluble hot melt adhesive injected out an injection outlet. CONSTITUTION:A sheet provided with two layers formed with a thin polyethylene bag 9 and a tissue paper 10 of 20 g/m<3> basis weight is fed on a belt 1 as a raw material sheet. The raw material feeding belt 1 is made of Teflon and rotates in the arrow mark direction 7 through rolls 12, 13 and 14. The position of the raw material feeding belt is sensed on the belt by phototubes 24 and 25, and only the edge sections 11 of both sides of the sheet are injection coated with a water-soluble hot melt adhesive heated and in the molten state injected out of an injection outlet 5. When the adhesive is applied, sometimes a very slight amount of adhesive may ooze out on the belt side through the sheet, and as the adhesion properties of the Teflon belt is extremely low, the adhesive is almost not adhered thereon to eliminate the troubles generated by the sheet adhered to the belt.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a bag making system for a very soft and flexible sheet, such as tissue paper, and particularly for making bags for collecting pet feces such as dogs and cats. It is suitable for equipment and manufacturing and lending methods.

[Conventional technology]

Double bags made of polyethylene and tissue paper are used to collect feces from pets such as dogs and cats. However, this sheet is extremely thin, soft, and has no waist at all. Therefore, conventional bag making equipment cannot be used as is, and there is no other way than to make bags manually.

However, as the demand for such collection bags has increased considerably recently, there is a strong demand for efficient mechanical bag making. Therefore, various methods of making bags using machines have been devised up to now, but they have not been successful because crepe paper is not stiff at all.

[Problem to be solved by the invention]

With the recent tightening of environmental and sanitary regulations in urban areas,
Demand for bags for collecting dog, cat, and other pet feces is increasing. Therefore, there has been a strong demand for an efficient mechanical bag making method and apparatus.

However, in order to achieve this, the sheets used for this purpose are extremely thin and soft, and have no stiffness at all, making it difficult for high-speed processing by machines.
Because the sheet is thin, the adhesive can penetrate the back side of the sheet and adhere to belts, etc., causing problems.Furthermore, the sheet is very light and is stacked with polyethylene bags, which tend to accumulate static electricity. There have been problems with how to eliminate static electricity, as it can cause trouble in the bag-making process.

[Means to solve the problem]

The inventor of the present invention prevented troubles caused by static electricity by overlapping a polyethylene bag and a thin sheet in a humidified atmosphere, and by injection-coating a molten water-soluble hot melt adhesive onto the sheet on a Teflon belt, the belt prevent adhesive from adhering to the surface and allow it to flow smoothly.
Furthermore, the present invention was achieved by devising the mechanism of the folding portion of the sheet so as to be able to handle sheets that are not stiff.

That is, (1) in a humidified atmosphere, the Teflon raw material supply belt 1, the belt 2 made of string or Teflon sheet, the Teflon bag making belts 3 and 4, the hot melt adhesive injection port 5, the guide 6, and the seed folding The stacked polyethylene bag and sheet are supplied from the raw material supply belt in the direction of the arrow 7, and the edge of the sheet is
Water-soluble hot-melt adhesive is injected from the injection port 5, the leading edge of the sheet passes through the gaitoro, travels on the belt 2, and when the folding point of the sheet comes under the folding plate 7,
The folding plate is lowered, and the sheet on belt 2 is pushed between bag-making belts 3 and 4 in the opposite direction to the direction of rotation of the belt, the sheet is folded and pressed, and the edges of the sheet are glued to form bags. A bag making device characterized by:
2) Polyethylene bag 9 and sheet 1 in a humidified atmosphere
0 are superimposed and supplied from the Teflon raw material supply belt l in the direction of arrow 7, to the edge 11 of the sheet.
A water-soluble hot-melt adhesive is applied, and the tip of the sheet passes through Gytro and travels on a belt 2 made of string or Teflon sheet, and when the folding point 27 of the sheet comes under the folding plate 8, the folding plate lowers. , the sheet on the belt 2 is pushed between the bag-making belts 3 and 40 in a direction opposite to the rotational direction of the belt, and the folded sheet is pressed and the edges of the sheet are glued to form a bag. This method is characterized by the fact that the inner layer is made of polyethylene and the outer layer is made of sheet.

The present invention will be explained in detail below.

The bag-making apparatus and bag-making method used in the present invention can be widely applied to bag-making of sheets that are very thin, soft, and have so-called stiffness, such as crepe paper.

Recently, bags made of polyethylene and tissue paper have been used to collect feces from dogs, cats, etc. when they are taken for a walk. It has a two-layer structure with the inner layer made of polyethylene and the outer layer layered with a tissue paper bag. When you use it, turn the bag inside out and put your hand inside it, and the bag becomes a polyethylene bag on the outside and a tissue paper bag on the inside. This will collect the droppings of dogs, cats, etc.
When the bag is turned over, the droppings are contained in the inner polyethylene bag. Therefore, the inner polyethylene bag can be removed and thrown away in a trash can, and the outer tissue paper bag can be flushed down the toilet.

The bag making apparatus and bag making method of the present invention must be used in a humidified atmosphere. On the raw material supply belt, polyethylene bags and sheets of very thin and light tissue paper are automatically layered, but in dry conditions they tend to get tangled due to static electricity. In addition, when the polyethylene bag and sheet are moved at a fairly high speed during the subsequent bag-making process, static electricity is generated in dry conditions, causing the polyethylene bag and sheet to become misaligned or become tangled and wrapped around the roll. This often happens. Humidification using water vapor, etc. is the simplest and most effective method for removing static electricity, but it is not limited to this, and other methods can also be used as long as they are effective in removing static electricity and can create a highly humid atmosphere. Can be adopted. It is also necessary to prevent the device from being charged with electricity by ensuring that it is grounded.

The raw material supply belt used in the apparatus of the present invention must be made of Teflon. While the sheet is flowing on the belt, hot melt adhesive is injected onto the opposite side of the belt, but at this time, a small portion of the adhesive that oozes out onto the other side of the sheet adheres to the belt. This causes the seat to stick to the belt, causing trouble. However, if Teflon is used for the belt, combined with the fact that a water-soluble hot melt adhesive is used as the adhesive, the affinity between the adhesive and Teflon is extremely low, making it difficult for the adhesive to adhere to the belt. , enabling smooth operations. It is preferable to keep the surface of the belt smooth at all times.

A guide 6 must be installed at the tip of the raw material supply belt. This guide plays the role of smoothly placing the sheet flowing in the direction of the arrow 7 on the belt 1 onto the next belt 2 made of a string-like or Teflon sheet. It is necessary to adjust the length so that it does not become an obstacle when it is pushed between two bag-making belts. If the guide is too short, the sheet will get caught up at the tip of the belt, making it impossible to place it smoothly on the belt 2. If the guide is too long, it will be difficult to fold the sheet in half and push it between the bag-making belts. , one bow will cause trouble.

Further, the belt 2 needs to be rotated in the direction of the arrow 7. Further, the belt needs to be made of a string or a Teflon sheet. The string-like belt usually has a circular or oval cross section, and is hung on a pair of rolls at intervals. The sheets flowing on the raw material supply belt are
Due to the action of the guide, the sheet smoothly rides on the string-like belt and flows in the direction of the arrow, but when the folding plate lowers and the sheet is folded in half and is pushed between the bag-making belts, the sheet on the string-like belt The direction of rotation is opposite to the direction of rotation of the belt, but if the belt is in the form of several strings, the area of contact with the sheet is small, so the resistance is small and the sheet can move smoothly backwards. Furthermore, if the belt is made of a Teflon sheet, the same effect can be obtained since Teflon has a very low coefficient of friction.

The bag-making belt 3.4 must be made of Teflon. The sheet is folded in half at position 27 by the folding plate 8,
It is pushed between the bag-making belts.

The sheet is pressed between the belts 3.4 and the edges of the sheet are glued together with hot melt adhesive to form a bag. At this time, a very small amount of adhesive may seep out onto the back side of the sheet, but if it gets on the belt, the sheet and belt will stick together, causing trouble. However, since Teflon has extremely low affinity with water-soluble hot-melt adhesives, the exuded adhesive is difficult to stick to, making it possible to make bags smoothly. It is preferable to keep the surface of the belt smooth at all times.

In the bag making method of the present invention, it is necessary to use a water-soluble hot melt adhesive as the adhesive. Recently, a wide variety of hot melt adhesive products have been developed and are widely used. However, these adhesives are usually all hydrophobic;
There are very few water-soluble ones and they are almost never used.

In the method of the present invention, especially by using a water-soluble adhesive, if the sheet is made of a material that can be dispersed in water, the entire bag can be disposed of by flushing it into a flush toilet. Here, water-soluble hot melt adhesives include those that completely dissolve in water at room temperature, as well as those that have a high affinity with water and swell and disperse to the extent that they can be disposed of in flush toilets.

In addition, when using it as a collection bag for pet feces such as dogs and cats,
Since the sheet is thin tissue paper and has a property of being very easily dispersed in water, after using this collection bag, the tissue paper bag can be disposed of by flushing it into a flush toilet.

Furthermore, when applying hot melt adhesive to the edge of the sheet by injection, it is preferable to apply it only to one side of the adhesive surface. This is to reduce the amount of adhesive used and to reduce the amount of adhesive that seeps through the sheet onto the belt surface, reducing trouble during bag making and improving work efficiency. This is to make it easier for the paper bag to disperse into the water when flushed down the toilet.

〔Example〕

Hereinafter, the present invention will be described in detail with reference to the drawings specifically showing the present invention. FIG. 1 is a flow sheet showing one embodiment of the present invention. FIG. 2 shows a front view of the raw material sheets stacked on belt l. The raw material sheet is placed on the belt l,
Thin polyethylene bag and 2 pieces of r& paper with a basis weight of 20g
The layered sheets are supplied in a stacked manner with the positional relationship shown in FIG.

The raw material supply belt 1 is made of Teflon and has rolls 12, 13.
14, and rotates in the direction of arrow 7. The position of the raw material sheet on the belt is detected by phototubes 24 and 25, and the heated and molten water-soluble hot melt adhesive is injected from the injection port 5 onto only the edges II on both sides of the sheet.

When applying adhesive, a very small amount of adhesive may ooze out through the sheet to the belt side, but Teflon belts have extremely low adhesion, so almost no adhesive sticks, and therefore the adhesive does not stick to the belt. Didn't cause any trouble.

The sheet coated with adhesive travels on the belt 1, and the leading end of the sheet is guided by a guide 6 installed at the end of the roll 13, rides on the string belt 2, and travels in the direction of the arrow 7.

The sheets of crepe paper used here are very thin, soft, and not stiff at all. Therefore, without the guide 6 installed at the end of the roll 13, the leading edge of the sheet would hang down as the roll 13 rotates, would be caught between the bag making belts 3 and 4, and would be pulled out without being made into a bag.

When the phototube 26 detects that the folding position 27 of the raw material sheet has reached the bottom of the folding plate 8, the folding plate instantly lowers, and the raw material sheet with the polyethylene bag and tissue paper stacked thereon is held at a predetermined position. It is pushed between rolls 13 and 15 and folded in half. At this moment, the sheet flowing on the belt 2 in the direction of the arrow is pulled in a direction opposite to the direction of rotation of the belt and forced through between the rolls 13 and 15.

As mentioned above, the guide 6 plays an important role in allowing the raw material sheet to flow smoothly from base 1 to base 2, but if the guide is too long when folding the sheet, its tip may get caught in the sheet. The sheet will not be pushed in properly, causing trouble. Therefore, the length of the guide needs to be set to an optimal length so that it can fulfill these two functions.

Several string belts 2 are hung between rolls 15 and 16 at intervals. Therefore, since there is space between the strings, even when the folding board is lowered and the sheet moves in the opposite direction to the flow of the belt, the contact area between the sheet and the belt is small, so it can flow smoothly with less resistance. . For this purpose, string belts are most suitable, but are not limited to them; any belt can be used as long as it does not easily adhere to adhesives and has low resistance when moving the seat and belt in opposite directions. It is possible. For example, Teflon belts are also suitable for this purpose.

The bag-making belt 3 passes between the rolls 17, 18, 19, and 20.
The belt 4 is rotating between the rolls 21.18.22.23 in the direction of the arrow 7. The sheet folded in half is
It is sandwiched between the bag-making belts 3 and 4, pressed by the roll 18, and the adhesive-coated part 11 and the folded and overlapped part are glued together to form a bag, and the rolls 19 and 2
It is taken out from between 2. In this embodiment, only the roll 18 is pressed, but for example, the roll 22
It is also possible to provide the same function as 18 and press continuously between the rolls 18 and 22.

Since the bag-making belts 3 and 4 also press sheets coated with adhesive, there is a risk that a very small amount of the adhesive may seep through the sheets to the belt side. At this time, if the adhesive adheres to the belt, the sheet will stick to the belt, causing trouble. However, since a water-soluble hot melt adhesive is used here as the adhesive and the belt is made of Teflon, the affinity between the two is extremely low, and smooth bag making is possible with almost no adhesion to the belt.

FIG. 3 shows a perspective view of the manufactured bag. The inner layer is a polyethylene bag and the outer layer is a double bag consisting of two layers of tissue paper sheets. The tip of the inner polyethylene bag is partially folded in so that when the double bag is turned inside out to collect dog, cat, etc. feces, the tip of the bag spreads out to make collection easier. It is.

〔effect〕

Recently, there has been an increase in demand for fecal collection bags used when walking pets such as dogs and cats. For this purpose, bags made of polyethylene bags and sheets of tissue paper are used. However, because it is extremely thin and soft, and has no elasticity, conventional bag-making equipment cannot be used as is, and the only method was to make bags by hand.

However, according to the present invention, the conventional manual bag making process can be replaced with a machine, and productivity and economic efficiency can be significantly improved.

[Brief explanation of the drawing]

FIG. 1 shows a flow sheet of one embodiment of the bag making apparatus according to the present invention, and FIG. 2 shows a front view of a raw material sheet;
FIG. 3 is a perspective view of a bag for collecting feces from dogs, cats, etc. - Raw material supply belt 2 - Belt made of string or Teflon sheet 3.
4--Bag making belt 5-Water-soluble hot melt adhesive injection port 6--Rotational direction folding plate of guide belt Polyethylene bag Paper sheet adhesive application part 13.14.15.16.17.18.19.20 .2
1.22.23- Roll 25.26- Folding position of phototube sheet Figure 1

Claims (3)

[Claims] (1) In a humidified atmosphere, Teflon raw material supply belt 1, belt 2 made of string or Teflon sheet, Teflon bag making belts 3 and 4, hot melt adhesive injection port 5, guide 6, and sheet folding plate 7 A stacked polyethylene bag and sheet are fed from a raw material supply belt in the direction of arrow 7, water-soluble hot melt adhesive is injected onto the edge of the sheet from injection port 5, and the tip of the sheet is fed through guide 6. When the folding point of the sheet comes under the folding plate 7, the folding plate lowers and the sheet on the belt 2 moves against the direction of rotation of the belt, and passes along the bag making belt 3 and the folding plate 7. 4, the sheet is folded and pressed, and the edges of the sheet are glued to form a bag. (2) In a humidified atmosphere, the polyethylene bag 9 and the sheet 10 are overlapped, and the material is supplied from the Teflon raw material supply belt 1 in the direction of the arrow 7, and a water-soluble hot melt adhesive is applied to the edge 11 of the sheet. is applied, the leading edge of the sheet passes through a guide 6 and advances on a belt 2 made of string or Teflon sheet, and when the folding point 27 of the sheet comes under the folding plate 8, the folding plate descends and the top of the belt 2 passes through the guide 6. The sheet is rotated in the direction opposite to the direction of rotation of the belt, and the bag-making belt 3
and 4, and the folded sheet is pressed, and the edges of the sheet are glued to form a bag.The inner layer is made of polyethylene and the outer layer is made of a sheet. Method. (3) The bag making apparatus and bag making method according to Claims 1 and 2, wherein the sheet 10 is a two-layered tissue paper, and the bag is a bag for collecting feces of pets such as dogs and cats.