Resin Engaging Member Low-Temperature Welding
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Solution Overview
Problem
Existing methods for producing engaging members for packaging bags face challenges in achieving sufficient low-temperature welding ability, mechanical strength, heat resistance, and external appearance, particularly with polypropylene and polyethylene resins, which often result in external defects and increased energy costs due to temperature sensitivity and incompatibility issues.
Innovation Solution
A resin composition comprising a polypropylene type resin with a maximum melting peak temperature of not more than 145°C and a polybutene type resin with a maximum melting peak temperature of not more than 130°C, combined in specific proportions, is used for the engaging member, allowing for effective low-temperature welding while maintaining mechanical strength and heat resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the welding temperature is increased to improve welding speed and productivity, then the welding efficiency is improved, but external defects such as shrinking and creases occur on the bag
Solution Approach 1:
The patent changes the material composition parameter of the engaging member by using a polypropylene type resin with a specifically controlled melting point (100°C to 145°C). This parameter change allows the welding temperature to be reduced to a range that prevents external defects while maintaining adequate welding speed, thus resolving the contradiction between productivity and manufacturing precision.
2Manufacturing precision
If the welding temperature is decreased to prevent external defects and improve appearance, then the external appearance quality is improved, but the welding time increases and productivity deteriorates
Solution Approach 1:
The patent optimizes the melting point parameter of the polypropylene type resin to fall within 100°C to 145°C, which enables welding at lower temperatures (reducing external defects) while maintaining reasonable welding speeds. This parameter optimization resolves the contradiction between manufacturing precision and productivity.
3Reliability
If a polyethylene type resin is blended to improve low-temperature welding ability, then the welding ability at low temperature is improved, but incompatibility between polypropylene and polyethylene causes external defects and deteriorates commercial value
Solution Approach 1:
The patent uses a homogeneous polypropylene type resin material throughout the engaging member structure, avoiding blending with incompatible polyethylene type resins. This homogeneous material approach ensures good low-temperature welding ability while preventing external defects caused by resin incompatibility, thus resolving the contradiction between reliability and manufacturing precision.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution enables engaging members with improved low-temperature welding ability, mechanical strength, and heat resistance, reducing external defects and energy costs, while maintaining satisfactory external appearance and productivity.
Implementation Method 1
a polypropylene type resin (A) and a polybutene type resin (B), in which the melting point of the polypropylene type resin (A) is 100°C to 145°C, the melting point of the polybutene type resin (B) is 80°C to 130°C
Data Source
AI summary
This engaging member includes a male part and a female part each of which is capable of engaging with each other, in which each of the male part and the female part has a welded part to a main body of a bag and a part other than the welded part, at least the welded part is formed by a resin composition including (A) a polypropylene type resin having a maximum melting peak temperature measured by a differential calorimeter of not more than 145° C., and a melt flow rate ranging from 0.5 g/10 min. to 20 g/10 min., and (B) a polybutene type resin having a maximum melting peak temperature measured by a differential calorimeter of not more than 130° C., and a melt flow rate ranging from 0.1 g/10 min. to 20 g/10 min.