SU931594A1 - Method of sealing polymeric packages - Google Patents

Description

one

The invention relates to a technique for sealing polymeric bags, preferably used for filling in dry or pasty household chemicals, and can be used in chemical, food and other sectors of the national economy.

Closest to the proposed technical dryness and the achieved result is a method of sealing polymer bags, involving the formation of double seams 1.

However, it is impossible to obtain a guaranteed seam by a known method when welding surfaces contaminated with a viscous product, because if it enters the welding zone, a part of the product gets trapped and after removing the load from the welding element in the area where the product is located, the joint is destroyed.

The purpose of the invention is to increase the strength and tightness of the welded joint of packages.

This goal is achieved by the fact that in the method of sealing polymeric packages involving the formation of double seams, the inner seam is made discrete in the immediate vicinity of the peripheral joint.

The method is carried out as follows.

The welded pits are made in the form of double pits, the peripheral one of which is a solid line of small width, because the welding goes through a viscous product and ensures the tightness of the package, the inner seam is applied between the sealing seam and the packaged product at least one dotted line in the immediate vicinity of the peripheral joint, due to the discreteness of the internal seam, dynamic loads are dissipated on its elements and the distribution joint acts on the sealing seam nny kick.

Performing an internal seam discrete allows the product to freely enter 20 into the package volume. The discrete seam also serves as a barrier-dispersing seam when loads are applied to the package, while the destruction of individual elements (dashes) of the discrete seam does not violate the integrity of the packaging film.

Testing was performed on dropping polyethylene bags with a film thickness of 0.3 mm to determine the possibility of sealing polyethylene (PE) bags with pasty detergents with a tape from a combination film, which uses a film of polyethylene cladding of the PNL-3 brand.

The PNL-3 tape is folded V-shaped with a PE-layer inwards and welded on the two end sides of the plastic bags by thermal contact welding at a temperature of 140 ° C welding elements and a welding time of 1.5 s.

The drop height is 1.5 m, semi-concrete. The strength of welds is determined by clause 4.4 of GOST 17811-72. For comparison, dropping tests are performed and the strength of the welds of a polyethylene bag is determined without the use of an PNL-3 film tape.

The test results are shown in tables.

Durability of welds, kg / cm 115

Dropping the bag to destruction, count 12

The economic effect from the introduction of the proposed method consists in reducing the consumption of polymeric materials during the transition to film packaging, reducing the scrap rate of finished products and increasing the degree of filling of vehicles.

Claims (1)

Invention Formula Sealing method, polymer bags, providing for the formation of double 15, 6 132.4 1-4 14-16 seams, characterized in that, in order to increase the strength and tightness of the package welded joint, the inner seam is made discrete in the immediate vicinity of the peripheral seam. Sources of information taken into account during the examination 1. USSR author's certificate No. 644674, cl. B 65 B 51/30, 1976.