JPS581483Y2 - Powder storage bag - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a bag that is ideal for storing powdery materials such as cement, fertilizer, flour, or synthetic resin microwaves that are normally filled with pressurized air during bagging.

The present applicant is Utility Application No. 52-63712
61112 Publication), (a) To prevent air from dissipating over time during filling of the bag and after sealing the bag when filling the bag with powder or granular material,
The material constituting the bag must be breathable.

(b) It can be made into any shape using composite paper that simultaneously satisfies the following two requirements: The material that makes up the bag has moisture resistance to protect the powder and granular material that is the filling inside the bag from moisture after the bag is sealed. A formed bag is disclosed.

This case is based on the above-mentioned Utility Application No. 52-63712 (Sho 53-
This invention relates to an improvement of the bag for storing powdery materials disclosed in Japanese Patent Publication No. 161112), and its structure will be explained below based on the accompanying drawings showing one embodiment.

In the drawings, reference numeral 1 denotes a housing body formed into an arbitrary shape, and this housing body 1 is composed of a composite sheet 2.

The composite sheet 2 is a strong sheet having air permeability, in other words, a polyolefin layer 5 having ventilation cuts 4 provided on the entire surface or a portion thereof on one side of a flat fabric 30 woven from polyolefin flat yarns. A breathable sheet γ is laminated on top of this with an adhesive layer 6 arranged in parallel at appropriate intervals.
It is important for bag making that the side is used as the inner surface of the bag.

In addition, as a strong sheet with breathability, in addition to flat woven thin films, narrow films made of thermoplastic synthetic resin are arranged in separate layers in both the vertical and horizontal directions and are integrated by thermal bonding. A film made of synthetic resin with short and narrow cracks in the same direction and glued together so that the directions of the cracks intersect with each other, and a net-like material made of nylon fiber etc. can be used as a substitute. You may.

In addition, materials that can be used as breathable sheets must have appropriate breathability, such as kraft paper and nonwoven fabrics, while materials that can be used as adhesive layers include polyolefin resins and hot melt adhesives. be.

Furthermore, the ventilation cuts provided in the polyolefin layer may be minute and short and may be of any type, but when the polyolefin layer is formed in advance and laminated as a film, the cuts are made in the film with a razor blade or the like. It is preferable to provide

Next, the ventilation mechanism when filling the bag with powder or granular material, such as cement, will be described with reference to Figure 3. The remaining residual air A passes through the entire air permeable sheet γ, such as paper, as shown by the arrow, and then enters the ventilation path 8, and a part of it passes through the ventilation cut 4 provided in the polyolefin layer 5. It is radiated out of the bag from the weave of the flat fabric 3, and a part of it flows through the ventilation path 8 and is quickly radiated out of the bag from the sewing machine seam part or the bag end.

In addition, 10 is a sewing thread.

At this time, since Shichimen) B is normally filled into the bag at a temperature of around 90°C to 120'C, the ventilation cuts 4 provided in the polyolefin layer 5 are fused again due to the heat retained by the cement. Closed.

Describe the effects of this proposal below.

l) When the bag is filled with powder or granular material, the remaining air inside the bag flows into the air passage of the composite sheet that is the bag's constituent material, as described above, during filling and after the bag material is filled, causing the polyolefin layer to flow into the bag. Since the air is completely radiated out of the bag from the provided ventilation slits, bag sewing machine seams, and paper edges, there is no need to worry about the bag bursting or being damaged due to residual air.

2) Since the bag in this case is made using a composite sheet with the above-mentioned structure, if the powder or granular material, especially cement, etc., retains a considerable amount of heat during filling, cement may not be placed inside the bag. After filling, the ventilation slits in the polyolefin layer are fused and closed by the heat retained by the cement, completely blocking moisture from entering from the outside and preventing the contents from deteriorating, making it easy to store the cement. Perfect as a bag.

3) Furthermore, the outer layer of the bag is a strong sheet with breathability,
For example, since we use a flat fabric woven from polyolefin flat yarn, the excellent properties of this fabric itself, such as toughness, flexibility, flexibility, and elastic recovery rate, are also added to the bag itself. It is possible to make a bag that is easy to handle and durable, with excellent toughness and bending strength.

In this way, this bag has a breathable function that allows the pressurized air inside the bag to completely and completely dissipate the residual air that remains inside the bag when it is filled with powder and granular materials, both during filling and after the bag material is filled. It also has a moisture-proof and waterproof function that completely protects the contents after the bag material from moisture intrusion outside the bag, so it retains heat and pressurizes when filling powder and granular materials, especially cement. Ideal as a storage bag for supplies filled with air.

[Brief explanation of the drawing]

FIG. 1 is a partially cutaway schematic diagram of the present invention, FIG. 2 is a cross-sectional view of a composite sheet used in the present bag, and FIG. 3 is an explanatory view showing the ventilation mechanism when filling powder and granular materials into the present bag. DESCRIPTION OF SYMBOLS 1... Packing body, 2... Composite sheet, 3... Flat woven fabric, 4... Ventilation cut, 5... Polyolefin layer, 6... Adhesive layer, γ... Gutter-resistant sheet , 8... Ventilation path, 9... Filling port, 10... Sewing thread, A... Residual air, B... Cement.

Claims (3)

[Scope of utility model registration request] (1) Tough sheet with breathability - polyolefin coating layer with ventilation cuts provided on the entire surface or part of it - adhesive layer in the form of stripes arranged in parallel at appropriate intervals - breathable sheet, in sequence. A powder and granular material storage bag characterized by being made from a laminated and integrated composite sheet so that the breathable sheet side is the inner surface. (2) Utility Model Registration Claim 1. A bag for storing powder and granular materials, characterized in that the breathable sheet is made of paper or nonwoven fabric. (3) Utility model registration The bag according to claim (1) is characterized in that the striped adhesive layers arranged in parallel at appropriate intervals are made of polyolefin or hot melt adhesive. Powder storage bag.