JPS591951Y2 - Multilayer bag with a synthetic resin tubular film bag in the innermost layer - Google Patents

Description

[Detailed explanation of the invention] In recent years, for the purpose of moisture proofing, a synthetic resin tubular film is used as the innermost layer, and this is wrapped in a plurality of bag materials such as kraft paper or resin cloth to form a cylindrical body, which is then cut into the required size or by a bag making machine. Moisture-proof bags are widely used, in which the innermost resin tubular film is heat-sealed using a heat-sealing machine or the like during the flow, and a resin bag has a bottom. When items are stored, the stress of the load when the storage bags are piled up and the action of strong acid are applied to the heat-sealed parts, causing the heat-sealed parts to peel or break when the bags are transported or stored, resulting in damage to the stored items. It was difficult to ensure safety as a transportation bag, as some water leaked out.

The present invention was devised in view of the current situation, and is a synthetic resin tubular film bag that is constructed so that stored items do not directly act on the heat-sealed parts of the upper and lower openings of the synthetic resin tubular film bag interposed in the innermost layer. The present invention relates to a multilayer bag having a synthetic resin tubular film bag in the inner layer.

An example of its implementation will now be described in detail with reference to the drawings.

The edges on both sides of the three layers of kraft paper 1, 2, and 3 cut into rectangular shapes are overlapped and pasted 4 to the body to form a cylindrical body, and the lower edge of the cylindrical body is sewn with a sewing machine 5 to form an outer bag.

Next, a band-shaped heat-sealed portion 8 having a width between the inner walls of the lower end of the synthetic resin tubular film cylindrical body 7 having a length such that it protrudes 6 from the upper edge of the outer bag when interposed in the innermost part of the outer bag. A synthetic resin bag 9 with a bottom is folded over the side wall of the bag 1 above the band-shaped heat-sealed portion and inserted into the exterior bag.

In this case, a solid substance such as strongly acidic monochloroacetic acid is stored inside a synthetic resin bag with a bottom that protrudes from the upper edge of the outer bag, and the upper edge of the synthetic resin bag has a bottom. A band-shaped heat-sealed part 10 having a certain width is provided between the inner walls of the edge, and the lower part of the band-shaped heat-sealed part 10 is folded over one side wall of the bag and pushed inward from the upper edge of the outer bag. Over tape or the like is applied to both sides of the opening and sewn with a sewing machine to complete the enclosure of the stored item.

Therefore, in the bag of the present invention, the belt-shaped heat-sealed part provided on the bottomed synthetic resin bag is fused with a certain width, and furthermore, this welded part is attached to one side wall from above the belt-shaped heat-sealed part. Since it is folded and inserted into the outer bag, even if the stored items, such as monochloroacetic acid, which has strong acidity, are stored in the bottomed synthetic resin bag, the load stress and the Even if a strong acid does not act and a small amount of stored items moves inside the area during transportation, storage, etc. and acts directly on the band-shaped heat-sealed part, this band-shaped welded part has a certain width. Since the bottomed synthetic resin bag is fused together, there is no possibility of a gap being created between the inner walls at the lower end or peeling between the inner walls.

Furthermore, the upper opening is also constructed by providing a band-shaped heat-sealed part with a certain width after storing the stored items, and folding it in the same way as the fused edge and pushing it into the outer bag, so it can be directly attached like the lower edge. Load stress of stored items, strong acids, etc. do not act on the band-shaped heat-sealed portion.

However, since the load stress and strong acid of stored items do not directly act on the band-shaped heat-sealed parts provided at the upper and lower ends of the inner bag of the present invention, the band-shaped heat-sealed parts provided at the upper and lower ends of the inner bag of the present invention are not directly affected by the load stress or strong acid of the stored items. To provide a multilayer bag having great practical value and having a synthetic resin tubular film bag as the innermost layer, which can completely prevent stored items from leaking due to peeling of the binding part and can be safely handled.

[Brief explanation of drawings]

Fig. 1 is a plan view of the bag according to the present invention, Fig. 2 is an explanation of an enlarged vertical cross-sectional view taken along the line A-A in Fig. 1, and Fig. 3 is a longitudinal cross-sectional view of the completed bag after storing items. be. In addition, in the figure, 1, 2 and 3 are kraft base paper, 4 is body pasting, 5 is machine stitched, 6 is protrusion, 7 is a synthetic resin tubular film cylinder, 8 is a band-shaped heat-sealed part, 9 is a bottomed synthetic In the resin bag, reference numeral 10 indicates a band-shaped heat-sealed portion, and reference numeral 11 indicates a sewing machine stitch.

Claims (1)

[Scope of utility model registration request] A band-shaped heat-sealed part having a width equal to the width between the inner walls of the lower end of the synthetic resin tubular film cylinder is provided inside the outer bag having a bottom, and the band-shaped heat-sealed part is bonded from slightly above the band-shaped heat-sealed part. A synthetic resin tubular film bag is placed in the innermost layer, with a tubular film inner bag having a length such that its upper end projects beyond the upper edge of the outer bag. Multi-layer bag with.