What Are the Common Problems When Heat Sealing Aluminum Foil Bags?

Heat sealing aluminum foil bags are getting popular these days, and Haomei has large amount of in-stock heat sealing aluminum foils for sale at low price now and we welcome your enquiry through email and calls. What are the common problems when heat sealing aluminum foil bags? Let's have a look together!

Problem 1: the heat sealing aluminum foil gets brittle

Reasons:

(1) The heat sealing temperature is too high;

(2) Excessive incentives;

(3) The heat sealing of heat sealing aluminum foils time is too long;

(4) The edge of the upper sealer is too sharp or the coated PTFE is damaged;

(5) The silicone rubber of the bottom seal is too hard;

(6) During the compounding and curing process of heat sealing aluminum foil, part of the adhesive penetrated into the film. Due to the influence of the penetration of the adhesive, the toughness (impact resistance) of the substrate decreases and the brittleness increases;

(7) The heat sealing strength of the plastic composite packaging bag increases after cooling and placing, and it also tends to become brittle.

Countermeasure:

(1) According to the heat sealing characteristics of the heat sealing aluminum foils and inner sealing layer material, select the appropriate processing temperature, pressure excitation and heat sealing time;

(2) Improve the surface state of the upper heat sealing knife to make the surface of the sealer flat;

(3) It is well wrapped with polytetrafluoro olefin cloth;

(4) Choose a silicone rubber pad with appropriate hardness.

Problem 2: the heat sealing aluminum foil is warped after heat sealing

Reasons:

(1) The thickness of the composite film is inconsistent;

(2) The heat sealing temperature is too high or the heat sealing time is too long;

(3) In the longitudinal heat sealing knife part, the running track of the composite film is not straight;

(4) Insufficient cooling of heat sealing aluminum foils;

(5) The curing time is not enough;

(6) The heat resistance of the substrate film is poor;

(7) The tension matching of the composite substrate is not properly controlled during the composite process, resulting in residual force after curing and shaping, especially when the composite film thickness is thin, such failures are more likely to occur.

Countermeasure:

(1) Adjust the tension of the floating roller;

(2) Select the inner sealing base material of heat sealing aluminum foil with low temperature heat sealability;

(3) Adjust the heat sealing temperature to a suitable temperature;

(4) sub-cooling;

(5) Filling and ripening;

(6) Re-select the surface substrate film;

(7) Adjust the tension of each part of the composite processing equipment, and try to make the retraction rate of the two substrates composited by the heat sealing aluminum foils equal.