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    <element id="ACU_DebtDetailsNarrativeAbstract" name="DebtDetailsNarrativeAbstract" abstract="true" nillable="true" xbrli:periodType="duration" type="xbrli:stringItemType" substitutionGroup="xbrli:item" />
    <element id="ACU_SegmentInformationDetailsNarrativeAbstract" name="SegmentInformationDetailsNarrativeAbstract" abstract="true" nillable="true" xbrli:periodType="duration" type="xbrli:stringItemType" substitutionGroup="xbrli:item" />
    <element id="ACU_SegmentInformationFinancialDataBySegmentDetailsAbstract" name="SegmentInformationFinancialDataBySegmentDetailsAbstract" abstract="true" nillable="true" xbrli:periodType="duration" type="xbrli:stringItemType" substitutionGroup="xbrli:item" />
    <element id="ACU_ReconciliationOfSegmentOperatingIncomeDetailsAbstract" name="ReconciliationOfSegmentOperatingIncomeDetailsAbstract" abstract="true" nillable="true" xbrli:periodType="duration" type="xbrli:stringItemType" substitutionGroup="xbrli:item" />
    <element id="ACU_SegmentRevenuesDetailsAbstract" name="SegmentRevenuesDetailsAbstract" abstract="true" nillable="true" xbrli:periodType="duration" type="xbrli:stringItemType" substitutionGroup="xbrli:item" />
    <element id="ACU_ShareBasedCompensationArrangementsByShareBasedPaymentAwardWeightedAverageExercisePricePerShareAbstract" name="ShareBasedCompensationArrangementsByShareBasedPaymentAwardWeightedAverageExercisePricePerShareAbstract" abstract="true" nillable="true" xbrli:periodType="duration" type="xbrli:stringItemType" substitutionGroup="xbrli:item" />
    <element id="ACU_SaleOfPropertyDetailsNarrativeAbstract" name="SaleOfPropertyDetailsNarrativeAbstract" abstract="true" nillable="true" xbrli:periodType="duration" type="xbrli:stringItemType" substitutionGroup="xbrli:item" />
    <element id="ACU_SaleOfPropertyDetailsAbstract" name="SaleOfPropertyDetailsAbstract" abstract="true" nillable="true" xbrli:periodType="duration" type="xbrli:stringItemType" substitutionGroup="xbrli:item" />
    <element id="ACU_GainOnSaleAdjustmentsAbstract" name="GainOnSaleAdjustmentsAbstract" abstract="true" nillable="true" xbrli:periodType="duration" type="xbrli:stringItemType" substitutionGroup="xbrli:item" />
    <element id="ACU_AccrualForEnvironmentalRemediationTableDetailsAbstract" name="AccrualForEnvironmentalRemediationTableDetailsAbstract" abstract="true" nillable="true" xbrli:periodType="duration" type="xbrli:stringItemType" substitutionGroup="xbrli:item" />
    <element id="ACU_BusinessCombinationDetailsNarrativeAbstract" name="BusinessCombinationDetailsNarrativeAbstract" abstract="true" nillable="true" xbrli:periodType="duration" type="xbrli:stringItemType" substitutionGroup="xbrli:item" />
    <element id="ACU_BusinessCombinationPurchasePriceAllocationDetailsAbstract" name="BusinessCombinationPurchasePriceAllocationDetailsAbstract" abstract="true" nillable="true" xbrli:periodType="duration" type="xbrli:stringItemType" substitutionGroup="xbrli:item" />
    <element id="ACU_BusinessCombinationProformaResultsOfOperationsAbstract" name="BusinessCombinationProformaResultsOfOperationsAbstract" abstract="true" nillable="true" xbrli:periodType="duration" type="xbrli:stringItemType" substitutionGroup="xbrli:item" />
    <element id="ACU_SubsequentEventsDetailsNarrativeAbstract" name="SubsequentEventsDetailsNarrativeAbstract" abstract="true" nillable="true" xbrli:periodType="duration" type="xbrli:stringItemType" substitutionGroup="xbrli:item" />
</schema>
