JPS5919008Y2 - Base material for sugar packaging - Google Patents

Description

[Detailed Description of the Invention] The present invention mainly relates to a packaging base material suitable for use in bags made into elongated cylindrical (stick-shaped) bags and filled with sugar by a so-called envelope pasting method.

Small bags of sugar for one cup of coffee or tea are widely used, but conventional packaging materials include (a) cellophane laminated with polyethylene, and (b) high-quality sugar. Paper laminated with polyethylene is often used.

Therefore, the former (a), cellophane laminated with polyethylene, is usually folded in half with the polyethylene side inside, heat-sealed the openings on both sides, and then filled with sugar from the remaining opening. Alternatively, polymerize two polyethylene sheets with their sides facing each other, heat seal them on three sides, and then fill the remaining opening with sugar and heat seal the opening. Bags are made using the so-called gassho pasting method and sugar is packed into bags, and the latter (b) is usually made into an elongated tube (stick shape) using the so-called envelope pasting method and one opening is heat-sealed. , sugar is packed into bags by filling the inside from the other opening and heat-sealing the opening, but since the base material of the former (a) is cellophane, Not only does it have the disadvantage of being moisture-proof, but it also has the disadvantage of being expensive.On the other hand, since it is the base for the latter (b), it not only has poor gas barrier and moisture-proof properties, but also makes it impossible to see inside. There is a drawback.

On the other hand, it is known that polypropylene is used instead of cellophane in the packaging base material of (a) above, but this creates two sides on the base material, so when using it for packaging bags, it is difficult to heat it. In order to print stickers, trademarks, etc., it is troublesome to have to check the front and back sides of the base material before applying it to bag making, printing, and filling equipment.

Moreover, the above base material (a) or the base material made by laminating polyethylene on polypropylene has a heat seal layer only on one side, so when heat sealing is performed using the envelope pasting method, the adhesive surface that forms the seal part is Since the material is different, there is a problem that curling occurs in the sealing part, which significantly reduces the commercial value.

For this reason, sugar packaging bags, which are made into so-called stick-like elongated cylindrical bags using the envelope pasting method, which have recently become popular on the market, are currently made of the base material (b) above. be.

However, since the base material (b) above is made of high-quality paper, it is opaque, and therefore the inside cannot be seen when filling with sugar, making it difficult to perform the filling operation.

In this regard, there is a known base material that is made of cellophane coated with polyvinyl chloride, which does not curl even when bags are made using the envelope pasting method, and also allows the inside to be seen through. When sealed, there is a problem in that the heat-sealed part becomes yellowish brown due to the influence of heat, reducing the commercial value.

In view of the current state of sugar packaging base materials as described above, the present invention aims to provide a sugar packaging base material that is transparent and can be used to form elongated cylindrical bags using the so-called envelope pasting method. The structure consists of two sheets of stretched polypropylene film laminated with polyolefin resin on one side.
It is characterized in that the sheets are laminated with the polyolefin resin layer on the outside with an adhesive layer interposed therebetween.

Next, embodiments of the present invention will be described with reference to the drawings.

What is shown in FIG. 1 is a stretched polypropylene film 11
A base for sugar packaging according to an example of the present invention, which is made by laminating two sheets with a polyethylene layer 12 laminated on one side thereof, with the polyethylene layer 12 on the outside, and an adhesive layer 13 made of polyethylene or an adhesive material in between. It is material A.

In each of the above embodiments, the stretched polypropylene film 11 is used as the base material in order to ensure easy opening when the base material of the present invention is formed into a bag for packaging sugar.

Moreover, this base material 11. ．． The polyethylene layer 12.12 was laminated on both outer surfaces of bag 11 so that both sides of the polypropylene film, which does not have heat weldability, had heat weldability, and care was taken to ensure the relationship between the front and back sides of the base material of the present invention during bag making. In addition to making it possible to proceed with the work without any trouble, the long stick-shaped bag can be easily heat-sealed using an envelope pasting method, and
This is to prevent curling or yellowing.

Furthermore, the reason why the two sheets of polypropylene film 11 having a polyethylene layer formed thereon are laminated with an adhesive layer 13 interposed therebetween is because there is already a sheet-like or film-like base material on which polyethylene resin 12 is laminated only on one side of the polypropylene film 11. This is so that the base material of the present invention can be easily formed using two of the base materials, and at the same time, more complete moisture resistance can be obtained.

The packaging base material of the present invention constructed as described above is similar to the conventional packaging base material described in (b) above, and is made by forming it into a long and slender cylinder using the so-called envelope pasting method, and heating one opening of the packaging base material. It is used to pack sugar by sealing it, filling it with sugar from the other opening, and heat-sealing the opening, and its packaging mode is as shown in Figure 2. .

The sugar packaging base material of the present invention is as described above, and has good gas barrier properties and moisture proof properties, but is made of a stretched polypropylene film that does not have heat weldability, and is made of two sheets of paper with a polyolefin layer formed on one side. are laminated with the polyolefin layer on the outside to give heat weldability to both outer surfaces of the base made of the two polypropylene films, so that the base material of the present invention can bond the polyolefin layers of the base material to each other regardless of their front and back sides. Therefore, the base material of this invention can be used to print trademarks, etc., to use the front and back sides of the base material in consideration of heat sealing during bag manufacturing, or to seal the opening by heat sealing after filling sugar bags. In addition to the effect that there is no need to consider the use of the front and back sides of the base material, it is also possible to attach envelopes, which was not possible with the conventionally known laminated film of single-layer polyethylene and single-layer polypropylene due to curling. Stick-shaped sugar packaging bags can be produced by this method, and the two polypropylene layers are expected to provide high moisture resistance, which is a unique effect as a base material for sugar packaging.

As a result, when sugar is packaged using the base material of the present invention, there is no risk of gas permeation or moisture entering the interior, so there is almost no risk of deteriorating the quality of the sugar.Of course, it is transparent as a whole. Therefore, when filling sugar, it is convenient to fill the sugar while observing the contents from the outside.

Therefore, the sugar packaging base material of the present invention can be used to form stick-shaped bags made by the envelope pasting method, which has recently become widely used for packaging sugar for coffee and tea. Extremely useful.

Furthermore, since the substrate of the present invention has two layers of substrates without gas barrier properties, it is particularly suitable as a substrate for packaging sugar containing flavorings.

It goes without saying that the sugar packaging base material of the present invention can be used in the same manner as the packaging base material (a) described above.

[Brief explanation of the drawing]

FIG. 1 is an enlarged sectional view of an example of the present invention, and FIG. 2 is a perspective view of sugar packaged. 11...Stretched polypropylene film, 12.
... Bot ethylene layer, 13 ... Adhesive layer,
A: Base material for sugar packaging, S: Heat seal.

Claims (1)

[Scope of utility model registration request] A base material for sugar packaging, characterized in that two sheets of stretched polypropylene film laminated with a polyolefin resin on one side are laminated with the polyolefin resin layer on the outside via an adhesive layer.