Tubular container with an outer tube and an inner container

Abstract

The invention relates to a tubular container (1) made from flexible material, comprising an outer tube (10) and an inner container (30) housed inside the outer tube (10) and intended to come into contact with the product (51) in the container. A flexible shoulder (32) of the inner container (30) is secured to a head (12) of the outer tube (10), with an intermediate cavity (7) being formed betweenthe outer tube (10) and the inner container (30). At least one hole (24) connects the intermediate cavity (7) with the exterior of the tubular container (1). The head (12) can include an airless or one-way valve. The outer tube (10) can recover its shape while the inner container (30) remains compressed during the use of the tubular container (1). The outer tube (10) and the inner container (30) are preferably made from materials that meet different requirements. The distal end (36) of the inner container (30) is preferably flared against the outer tube (10).

Description

technical field [0001] The present invention relates to a tubular container made of flexible material for containing cosmetics, food, medicine, etc., and more particularly, to a tubular container including an outer tube and an inner container accommodated in the outer tube. Background technique [0002] Flexible plastic tubes are widely used in the cosmetic, pharmaceutical or food industries. The flexible plastic tube is characterized by comprising a hollow body or skirt intended to contain a product, such as a cosmetic cream, and a head placed at one end of the skirt and intended to allow the discharge or dosing of the product. The head can be fitted with a neck, cap and dosing mechanism etc. for providing an outlet for the product. Once the tube has been filled with product, the end of the skirt opposite the head is sealed by heat transfer welding (typically by hot air, heat clamping, ultrasound, etc.). [0003] These flexible plastic tubes are obtained by various manufa...

AI Technical Summary

Problems solved by technology

However, obtaining polymeric compounds that meet various requirements (including mechanical requirements, food contact requirements, non-toxicity requirements, processability requirements, etc.) is extremely complex and expensive

It must also be added that when using polymeric compounds, maintaining and guaranteeing the properties of said compounds is complicated by the tolerances of the fundamental variables (fluidity, density, stiffness, etc.) of the polymers contained in the compounds

Therefore, obtaining a polymer capable of balancing all the properties required for the successful manufacture and use of the pipe is very complex, especially when the pipe is an injection molded pipe

Furthermore, the obligation to obtain polymeric compounds that meet stringent food contact or non-toxicity requirements directly precludes the use of many polymers in the preparation of compounds, which further hampers the design of polymeric compounds

[0006] The second problem concerns a tube known in the prior art, which actually consists of two tubes, one inside the other

This solution has drawbacks in obtaining a high reduction rate (the ability to transport all the contents of the tube out), since the tube cannot be completely collapsed due to the high level of rigidity of the inner tube head

[0007] A third problem concerns the sealing of double-tube tubular containers, such as those mentioned in the preceding paragraph, or such as dual-product containers (tubular containers consisting of an inner tube and an outer The outer tube has a head with a special configuration of two output holes for the two products so that the two products are simultaneously released and mixed together at the exact time of their application)

Welding the walls with the correct pressure in the area with four walls and not enough pressure in the area with two walls when compressing the jig resulting in poor welds in the area with two walls

Furthermore, this looseness hinders the introduction of the welding nozzle, which has to be adjusted very precisely inside the tube

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